Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2730-95
Magnetic Driven Centrifugal Chemical Process Pump
199507-05 Issued
Ministry of Chemical Industry of the People's Republic of China
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Chemical Industry Standard of the People's Republic of China
Magnetic Driven Centrifugal Chemical Process Pump
1 Subject Content and Scope of Application
HG/T2730-95
This standard specifies the form and basic parameters, design and technical requirements, test methods and inspection rules, marking, packaging, transportation, storage, complete set scope and use guarantee of magnetic drive centrifugal chemical process pumps (hereinafter referred to as pumps). This standard applies to magnetic drive centrifugal chemical process pumps for conveying flammable, explosive, flammable, toxic, corrosive and precious liquids with a relative density not exceeding 1.84. The rated performance range is: speed 1450~2900r/min, flow rate 6.3~400m/h, head 5~125m. The maximum working pressure of the pump and the temperature of the conveying medium are divided into three levels according to the material of the pump casing: if the casing is made of metal, the maximum working pressure is not more than 1.BMPa, and the temperature of the conveying medium is not higher than 220℃; if the casing is made of acid-resistant ceramics or non-metallic materials with metal as the base, the maximum working pressure is not more than 1.6MPa, and the temperature of the conveying medium is generally not higher than 80C; if the casing is made of thermosetting plastic or other non-metallic materials, the maximum working pressure is not more than 1.6MPa, and the temperature of the conveying medium is generally not higher than 80C. The fan material, the maximum working pressure is not more than 0.6MPa, the temperature of the conveying medium is not higher than 802
Reference standards
Technical conditions for bolts
Technical conditions for nuts
Tolerances and fits of ordinary threads
Technical conditions for high-quality carbon cable structural steel
Technical conditions for ordinary carbon structural steel
Surface roughness parameters and their values
Shape and position tolerances Provisions for dimensions without tolerances Stainless steel bars
Ductile iron castings
Tolerances and fits Limit deviations of dimensions without tolerances Technical conditions for stainless acid-resistant steel castings
Dimensions of pipe flange connections for general purposes
Centrifugal pumps, mixed flow pumps, axial flow pumps and vortex pump test methods, magnetic test methods for permanent magnetic (hard magnetic) materials, rare earth diamond, permanent magnetic material series
Rust-proof packaging
Casting dimension tolerances
General purpose molded polytetrafluoroethylene resin
High silicon corrosion-resistant cast iron parts
Rigid rotor balance quality, determination of allowable imbalance (grade) gray cast iron parts
Pump vibration measurement and evaluation methods
Pump noise measurement and evaluation methods
General engineering cast carbon steel
1995-07-05 approved standard by the Ministry of Chemical Industry of the People's Republic of China, all US standard industry data free download 1996-03-01 implementation
Gray cast iron for pumps Parts
Castings for pumps
2730—95
General technical conditions for packaging of electromechanical products
Sintered NdFeB permanent magnet materials
PTFE rods
General technical conditions for acid-resistant ceramic equipment
Technical conditions for single-stage single-suction chemical centrifugal pumps with fluoroplastic linings Fluoroplastic—48
Permanent ferrite materials
Technical conditions for coating of pump products
Types and basic parameters
3.1 Type
3.1.1 The pump is single-stage, single-suction, horizontal, axially inhaled, and vertically discharged upwards. 3.1.2
The pump is non-rigidly connected to the motor and transmits power through a magnetic drive device. 3.1.3 The direction of rotation of the pump is clockwise when viewed from the drive end. 3.2 Model
3.2.1 Model indication
IMC-O0
Code for flow-through parts made of non-metallic materials (this code can be omitted when the flow-through parts are made of metal materials)
Impeller nominal diameter (mm)
Discharge port diameter (mm)
Suction port diameter (mm)
Magnetic drive chemical process pump
When the flow-through parts of the pump are made of non-metallic materials, the code shall be as specified in Table 1. Table 1
(Coramies)
(Piastic)
(Tetlon)
3.2.3 Model example
IMC—100-65-250www.bzxz.net
Non-metallic materials for flow-through parts
Ceramic lining
Plastic lining
Other thermosetting plastics
Magnetic drive chemical process pump with suction port diameter of 100mm, discharge port diameter of 65mm, nominal impeller diameter of 250mm, and flow-through parts made of metal.
IMC-100—65—250C
The diameter of the suction port is 100mm, the diameter of the discharge port is 65mm, the nominal diameter of the impeller is 250mm, and the material of the flow-through parts is ceramic. ·2.
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3.3 Basic parameters
3.3.1 The basic performance parameters of the pump shall comply with the provisions of Table 2-1 and Table 2-2. The performance parameters in Table 2-1 and Table 2-2 are rated points under warm water conditions.
The working performance range of the pump is shown in Figure 1. Its flow rate is 6.3~400m/h, and the head is 5~125m. 3.3.2
The installation dimensions of the pump body shall comply with the provisions of Figure 2 and Table 3. 3.3.3
4 Design
4.1 Pump design
4.1.1 Pump performance
4.1.1.1 The design points of the pump performance parameters shall comply with the provisions of Table 2-1 and Table 2-2. 4.1.1.2 The pump shall have a stable characteristic curve. For each model and specification of the pump, the manufacturer shall provide the working range of the pump, that is, the performance of three points (small flow point, rated flow point, and large flow point), and draw the performance curve (the relationship curve between head, efficiency, shaft power, cavitation margin and flow rate).
4.1.1.3 The rated flow and head of the pump shall comply with the requirements of Table 2~1 and Table 2-2. The deviation shall comply with the provisions of GB3216C level. If the buyer requires a variant product with a smaller than rated flow and head, the manufacturer may meet its requirements by cutting the impeller according to the working range allowed by the characteristic curve.
Table 2-1
Suction port
Model
IMC-50-32-125
IMC-50—32-160
IMC-50—32—200
IMC-50-32-250
IMC-55-50-125
IMC-65-50-160
IMC-65-40--200
IMC—6540-250| |tt||IMC-B5—40—315
IMC-80-65-125
IMC-80-65-160
IMC-80-50-200
IMC-80—50-250
IMC-80-50-315
IMC-100-80-125
Discharge outlet
Impeller name
Diameter
Standard loss mm.bzeono.com Lift
Navvitation Shock Mass
(NPSH)
Model
IMC-100—80-160
IMC-100-85-200
IMC-100-65-250
IMC-100-85-315
IMC--125-160-200
IMC —125-100—250
IMC-125—100-315
IMC—50-32-125
IMC-50-32-1B0
IMC-50-32—2DD
IMC—50-32—250
IMC-65-50-125| |tt||IMC-65-50-1BB| | tt | -250
IMC—80- 50-315
IMC-10D-80-125
IMC-100-80-160
IMC-100-85-200
IMC-100-5-250
1MC-100-65-315
IMC—125—100—200
Suction port
Suction port||tt ||273095
Continued Table 21
Discharge outlet
Discharge outlet
Impeller name
Meaning diameter
Table 2—2
Impeller name
Meaning diameter
Standard reporting code, b2pinopino.com service English standard industry data urgent fee number head
F/moin
Gas candle residual plate
(N PSH),
Net Positive Suction Head
(NPSH)
Pump Model
IMC-125-100—250
IMC-125--100—315
IMC-125-100—400
IMC-150—125-250
IMC—150--125-315||tt| |IMC-150—125-400
IMC-200-150-250
IMC-200-150-315
IMC-200-150—400
50-32-250
Suction port
2730—95
Continued Table 2—2
Discharge port
Impeller name||t t||Diameter
-4015060
780-50-3157100-65-315/125-100-31516540-315
765-40-250780-50-2507
50-32-250
100-65-25025-100-250
NPSH|| tt ||(NPSH),
0-1607150-125157200-150- 31550-32-160-
60-50-315/100-65-315125-100-313065-40-315
0-1257150-125-35200-150-250
EEHFEH
65-0-200780- 50200100-65-2025-100-2005 0-32-200
150-32-160
50-32-125
65-50-160:80-65-160709-80-1602E
65-50-12580-65-126710-80-125810
405060
Figure 1 Performance of magnetic drive centrifugal chemical process pump Range standard pre-control network m.bzeoms.cm famous American standard industry information free download n=2900r/min
n=2900 and 1450m/min
n=1450/min
300400500600Q (m/b)
IMC-50—32-—125
32-200
IMC-50-
50-125
-50-160
IMC-65-50-200
IMC—65-50—250
IMC—65-50-315
IMC-80-65-125
85—200
65-250| |tt||IMC—65-65-315||t t||IMC-100-80--125
IMC-100-80-180
IMC-100-80-200
TMC-100-8050
IMC-100-80-315
2730—85
Figure 2 Pump body size
Standard replacement network b20cm various American standard industry information free download Load, discharge port diameter
IMC—125-—100-200
IMC—125-100—250
IMC-125—100—315
IMC—125-100-400
IMC—150-125-250
IMC-150-125-315
IMC-150- 125--400
IMC—200-150-250
IMC-200-150—315
IMC—-200-15D—400
HG/T2730-95
Continued Table 3
4.1.1.4 When designing a pump, it should be considered that at rated speed, the head of the new impeller to be replaced should be increased by 5% under rated conditions. In general, uncut impellers shall not be used.
4.1.1.5 The unit efficiency of the pump shall not be lower than the requirements of Table 21 and Table 2-2 at rated speed and rated conditions. Its deviation shall comply with the provisions of Class C in GB3216. In order to improve the efficiency of the pump unit, the disk friction loss (rotor cylindrical surface and rotor end surface friction loss), eddy current loss and volume loss of the cooling and lubrication flow channel in the rotor chamber of the magnetic transmission part shall be minimized as much as possible during design. 4.1.2 Cavitation aftershock (NPSH),
4.1.2.1 The NPSH shall not be greater than the provisions of Table 21 and Table 2-2, and its deviation shall comply with the provisions of Class ℃ in GB3216. 4.1.2.2 The NPSH test medium is warm water, and the test method is in accordance with the provisions of Article 5.3 of GB3216. 4.1.3 Hydraulic model and prime mover
The hydraulic design of the pump shall be optimized according to parameters such as flow rate, head, speed, shaft power, efficiency, NPSH, and specific speed. The percentage of the ratio K of the rated output power of the prime mover to the maximum shaft power within the working range of the pump shall not be less than the provisions of Figure 3. %
Rated shaft power of pump
4.1.4 Lubrication and cooling
4.1.4.1 The pump must have a lubrication and cooling system. The lubrication and cooling of the pump shaft and auxiliary bearings and the cooling of the heat generated by the eddy current in the metal isolation sleeve can be done by either internal flow (internal circulation) of the pumped liquid or independent lubrication and cooling isolated from the pumped liquid, i.e. external flow (external circulation) or mainly cooling and lubricating the pumped liquid, supplemented by external cooling and lubricating liquid, i.e. a mixed internal and external liquid method. 4.1.4.2 When the pumped liquid internal flow (internal circulation) method is adopted, the flow rate of the lubricating and cooling liquid should be limited to the amount that can take away the heat generated by the running heat base of the bearing and the eddy current in the isolation sleeve without vaporization. When independent lubrication and cooling methods are adopted, it should be ensured that the lubricating liquid and the pumped liquid do not seep into each other. 7.
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When the internal and external liquid mixing method is adopted, in addition to ensuring cooling and reasonable design of the lubricating flow channel, the auxiliary cooling liquid outside the pump should maintain a certain flow rate. 4.1.5 Critical speed, balance, vibration and noise 4.1.5.1 Under the operating conditions of the pump, the actual first critical speed of the rotor should be at least 10% higher than the maximum allowable continuous operating speed. 4,1.5.2 The rotating quarter parts and magnetic drive device of the pump should be subjected to a balance test, and the balance level should not be lower than the G6.3 level specified in GB0293. The rotating parts (impeller, inner rotor, shaft, etc.) that are subjected to dynamic balancing test after assembly shall have permanent and significant marks indicating their correct assembly position.
4.1.5.3 The vibration intensity of the pump shall not exceed the provisions of Class B in GB10889. 4.1.5.4 The noise level of the pump shall not exceed the provisions of Class B in GB10890. 4.1.6 Working pressure and pump body, pump cover
4.1.6.1 The design of the pump body shall take into account the characteristics of axial suction, vertical upward discharge, and the outlet located in the center of the top of the pump. The flow channel shall be designed according to the principles of minimizing the diffusion angle, uniform area change, and not turning too sharply. 4.1.6.2 The manufacturer shall specify the working pressure based on the working temperature, head and inlet pressure of the pump. The working pressure is equal to the sum of the head at the design point at the working temperature and the allowable inlet pressure of the pump, converted into the pressure at temperature. 4.1.6.3 The pump body and pump cover shall have sufficient thickness to meet the maximum allowable working pressure and allowable deformation of the pump at the working temperature, and can withstand the test pressure and allowable deformation at the ambient temperature during the water pressure test. 4.1.6.4 If the pump body is made of metal, the maximum working temperature of the pump shall not exceed 220℃, and the maximum allowable working pressure shall be 1.6MPa; if the pump body is acid-resistant ceramics made of non-metallic materials or non-metallic materials with metal as the base material and lining, the maximum working temperature of the pump shall generally not exceed 80C, and the maximum allowable working pressure shall be 1.6MPa; if the pump body is made of non-metallic materials such as thermosetting plastics, the maximum working temperature of the pump shall not exceed 80℃, and the maximum allowable pressure shall be 0.6MPa,
4.1.6.5 When the pump body and pump cover that bear pressure are made of metal, they shall have a corrosion allowance of not less than 3mm. If the pump body and pump cover are made of non-metallic materials, or lined with non-metallic materials, their corrosion allowance shall be determined according to the bottom corrosion resistance characteristics of the non-metallic materials. 4.1.6.6 The suction and discharge pipes of the pump shall be flanged and designed for the same pressure. The size of the flange part shall comply with the provisions of GB2555, and the bolts and nuts shall be well seated on the back of the cast flange. The bolt holes shall be distributed on both sides of the center plane of the volute, and shall not be on the center plane.
4.1.6.7 The external force and torque (i.e. pipeline load) acting on the inlet and outlet flanges of the pump body shall be within the allowable range of the pump calculation. If the load exceeds the allowable value, it shall be resolved by negotiation between the buyer and the manufacturer, or in accordance with the provisions of Appendix C (reference). 4.1.6.8 The sealing gaskets on the sealing surfaces of the pump body and the pump cover, and the pump cover and the isolation sleeve shall be able to adapt to the rated working conditions and withstand the test pressure: structural measures shall be taken to prevent extrusion.
4.1.6.9 The diameter of the external connection bolt of the pump body shall not be less than 12mm. If it is impossible to use 12mm bolts due to space limitations, smaller bolts may be used, but the minimum shall not be less than 10mm. The selected connecting bolts (performance level) should be able to meet the maximum allowable working pressure of the pump and the conventional tightening method.
4.1.6.10 All holes on pressure-bearing parts should be equipped with removable pipe plugs and pipe threads that are sufficient to bear pressure. The materials of pipe plugs and pipe threads should be suitable for the properties of the pump conveying medium, and the risk of scratching or biting of screws and threads should be reduced as much as possible. 4.1.6.11 If the screw holes of the connecting pressure-bearing parts (pump body, pump cover, etc.) of non-metallic pumps (plastic pumps, ceramic pumps) are set on plastic or ceramic parts, steel nut inserts should be embedded and avoid contact with the conveyed medium. 4.1.7 Impeller
4.1.7.1 The hydraulic performance of the impeller should be designed in accordance with the requirements of good cavitation margin, high efficiency and stable operation. The best efficiency point of the impeller should preferably be between the rated point and the positive belt (flow) point. 4.1.7.2 According to the purpose and conditions of use, the impeller type can be selected as closed, semi-open or open structure. 4.1.7.3 The impeller should be reliably fixed to ensure that it does not loosen or fall off during operation. 4.1.7.4 The distance between the stationary and rotating parts should be reasonable, and the working conditions and the performance of the selected materials should be considered to prevent mutual contact during rotation.
4.1.7.5 The mouth ring should be fixed on the impeller and the casing. The gap between the mouth rings varies according to the working conditions and materials. For pumps made of cast iron and bronze, the gap should be selected according to the table. For pumps made of carbon steel, Cr13 steel, and pumps with higher pumping medium temperature, the gap should be selected according to the table 5. For pumps made of austenitic stainless steel or similar acid-resistant steel, the gap should be selected according to the table 6. For pumps made of non-metallic materials, the gap between the mouth rings should be selected according to the table 7.
4.1.7.6 The axial force should be balanced by reliable and effective measures. Generally, the method of the mouth ring and the balancing hole of the impeller rear cover can be used for balancing. The remaining axial force is borne by the thrust end face of the bearing. The pressure of the thrust end face should meet the requirements of the thrust bearing design. Table 4
Inner diameter of mouth ring
Nominal diameter age
Inner diameter of mouth ring
Nominal diameter age
Inner diameter of mouth ring
Nominal diameter gap
Inner diameter of mouth ring
Nominal diameter age
Inner diameter of mouth ring
Nominal diameter gap
Inner diameter of mouth ring
Nominal diameter gap
Inner diameter of mouth ring
Nominal diameter gap
Inner diameter of mouth ring
Nominal diameter gap
4.1. 8 Pump shaft and sleeve
>288~340
>220~270
>75~110
>340~400
>110~140
>400~460
>90~120
>270320
>80~110
>190~220
>220~250
>14 0 ~ 180 | | tt | | > 480 ~ 520 | |>150~180
>380~400
>140~180
> 280~320
>220~280
>580~640
>180~220
>400~440
>160~190
>100150
4.1.8.1 The pump shaft shall have sufficient size and rigidity to transmit the maximum torque required under various operating conditions, and at the same time be able to continuously withstand all stresses caused by supporting oxygen, thrust and startup. 4.1.8.2 The direction of rotation of the cricket thread on the pump shaft shall ensure that the nut tends to be tightened when the shaft rotates. 4.1.8.3 Depending on the structural characteristics and material selection, the pump shaft may be equipped with a shaft sleeve or not. For pump shafts equipped with sleeves, the bearings and sleeves form a grinding pair; for pump shafts without sleeves, the bearings and pump shafts form a friction pair. 4.1.9 Bearings
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HG/T2730-95
4.1.9.1 Sliding bearings should be used for pump main shaft bearings, and their length-to-diameter ratio is generally selected between 1 and 2. 4.1.9.2 Grooves for cooling and lubrication should be opened on the inner diameter and thrust surface of the sliding bearing. The normal operation and service life of the bearing should not be affected by bearing cooling or lubrication.
4.1.9.3 The bearings should have certain corrosion and wear resistance to meet the requirements of the pump's positive belt operation and service life. 4.2 Design of magnetic drive device
4.2.1 Overall design requirements for magnetic drive device 4.2.1.1 The maximum driving magnetic torque of the magnetic drive device should match the torque under the maximum required power of the pump to ensure that the driving rotor (external magnetic rotor) and the driven rotor (internal magnetic rotor) run synchronously without slipping. 4.2.1.2 The magnetic drive device should have both high transmission efficiency and good magnetic stability. Technical reliability; it should also have the best economy of light weight and low cost.
4.2.2 Structural design of magnetic drive device
4.2.2.1 The magnetic drive device of the pump should adopt a circular structure. 4.2.2.2 The driving rotor (external magnetic rotor) and the driven rotor (internal magnetic rotor) are composed of permanent magnetic steel with radial magnetization and opposite magnetization directions. The magnetic steel is arranged alternately along the circumferential direction with different polarities and fixed on the low-carbon steel ring to form a magnetic circuit-breaking body, which is enclosed by a non-magnetic material sleeve on the outside.
The driving rotor (external magnetic rotor) can be directly fixed on the motor shaft or on the intermediate coupling shaft: the driven rotor (internal magnetic rotor) is fixed on the pump shaft.
4.2.3 Magnetic circuit design of magnetic drive device
4.2.3.1 The magnetic circuit of the magnetic drive device should generally adopt a pull-push (attraction-repulsion) combined permanent magnetic circuit. 4.2.3.2 The aspect ratio of the magnetic rotor should be optimized and should not be too large or too small, usually between 0.2 and 1. 4.2.3.3 The selection of the working gap (i.e. magnetic gap) in the magnetic circuit should be based on the actual needs of magnetic coupling when the torque is constant, and should be determined according to the performance, geometric dimensions and thickness of the isolation sleeve of the magnet. The thickness of the magnet should generally not be less than the thickness of the magnet. 4.2.3.4 The magnetic transmission torque should be calculated based on the magnetic performance parameters of the permanent magnetic material and the magnetic circuit structure. The working point of the magnet should be determined according to the dynamic magnetic circuit. The maximum static magnetic moment is calculated as twice the nominal magnetic moment. 4.2.3.5 The actual operating temperature of the magnet should be lower than the maximum operating temperature allowed by the magnet, and the size of the magnetic torque at the actual operating temperature of the magnet should be used as the basis for the design of the magnetic circuit to ensure the normal and continuous operation of the magnetic drive device. 4.2.4 Design of isolation sleeve
4.2.4.1 The isolation sleeve between the inner and outer magnetic rotors should be designed according to the design pressure of the pump body. 4.2.4.2 The isolation sleeve should be made of non-magnetic materials with high resistivity, high mechanical strength and good corrosion resistance. 4.3 Design of other main parts
4.3.1 Bracket
4.3.1.1 The bracket should have a certain rigidity, and its wall thickness should not be less than 8mm4.3.1.2 The inner cavity of the bracket should have enough space, and the distance between the outer diameter of the outer magnetic rotor and the inner diameter of the bracket should not be less than 10mm. 4.3.1.3 The bracket should be provided with vents.
4.3.2 Intermediate bearing body
4.3.2.1 The cooling chamber and the lubricating oil chamber on the intermediate bearing body should not be connected or leaking, and the gland, gasket or threaded connection shall not be used to isolate the coolant from the bearing lubricant.
4.3.2.2 All holes or gaps in the intermediate bearing body that communicate with the outside should be able to prevent dust and other dirt from entering and bearing lubricating oil from leaking out under normal working conditions. Under flammable and explosive working conditions, any device that seals the bearing body must not become the source of fire (explosion). 4.3.2.3 The intermediate shaft should have sufficient size and rigidity to ensure that it can transmit the maximum torque of the motor and withstand the centrifugal force when driving the rotor to rotate.
4.3.2.4 When the intermediate bearing body is lubricated with thin oil, there should be an oil level display; an oil drain plug should be set at the bottom of the bearing box and an air vent plug should be set at the top. If refillable dry oil lubrication is used, a dry oil overflow protection device should be installed. 10.
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4.3.3 Coupling
4.3.3.1 The coupling should be an elastic coupling and an appropriate coupling cover should be installed. The cover should be designed to cover all rotating parts of the coupling.
4.3.3.2 The coupling should be able to transmit the maximum torque of the driving force, and its speed should be compatible with the speed of the driving force. 4.3.4 Base
4.3.4.1 The design of the base should be able to withstand the force and torque transmitted from the pipeline as specified in Article 4.1.6.7. 4.3.4.2 The base should generally extend below the pump and prime mover feet, and there should be a sufficient number of anchor bolt holes on the base. 4.4 Types of materials for various components
4.4.1 The pump body, pump cover, impeller and other flow-through parts should be made of gray cast iron, acid-resistant ferrosilicon, alkali-resistant aluminum cast iron, chromium-based stainless cast steel, chromium-based acid-resistant cast steel, chromium-manganese-nitrogen acid-resistant cast steel, nickel-containing acid-resistant cast steel, titanium alloy and other materials according to the degree of corrosion of the conveying medium. 4.4.2 The flow-through parts are made of metal materials as the base. When non-metallic materials are used, the base materials can be gray cast iron, ductile iron, carbon steel cast steel; non-metallic lining materials can be acid-resistant ceramics and thermosetting plastics such as polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene and fluorine alloys.
4.4.3 The pump shaft can be made of high-quality carbon structural steel, chromium stainless steel, nickel-based alloy steel, titanium alloy, aluminum oxide and other materials. 4.4.4 The bracket, base and intermediate bearing can be made of gray cast iron or carbon structural steel, and the intermediate bearing body should be made of high-quality carbon structural steel and other materials.
4.4, 5 Sliding bearings should be made of silicon carbide, quartz, silicified graphite, para-polyphenylene, carbon fiber reinforced tetrafluoroethylene, polyphenylene sulfide and other non-metallic materials with good wear resistance, corrosion resistance and self-lubricating properties according to the characteristics of the conveying medium. 4.4.6 The material of the inner magnetic rotor matrix can be selected from metal and non-metal materials according to the material requirements of the pump's flow-through parts: the outer magnetic rotor matrix and the inner magnetic rotor magnetic conductor can be made of carbon cable structural steel, cast steel or gray cast iron, ductile iron and other materials. 4.4.7 The isolation sleeve can be made of austenitic stainless steel, nickel-based alloy steel, chromium-based alloy steel, titanium alloy, polyperfluoroethylene propylene, polyvinylidene fluoride, glass fiber reinforced polypropylene, polymaple and other metal materials and non-metal materials and their synthetic materials. : 4.4.8 The static sealing gasket material can be made of polytetrafluoroethylene, asbestos rubber and the like. 5 Technical requirements
5.1 In addition to meeting the requirements specified in this standard, the pump shall also meet the requirements of the product drawings and technical documents approved through the prescribed procedures. 5.2 Material standards and quality
The materials of the main parts of the pump shall meet the following standard requirements and shall have a material inspection certificate. 5.2.1 Iron castings shall comply with the provisions of GB1348, GB/T6880.1, GB8491 and GB9439. 5.2.2 Steel castings shall comply with the provisions of GB2100, GB/T6880.2 and GB11352. 5.2.3 Other metal parts shall comply with the provisions of GB699, GB700 and GB1220. 5.2.4 PTFE materials shall comply with the provisions of GB7136, ZBG33033 and HG2-531. 5.2.5 When the impeller is made of acid-resistant ceramic material, its material properties shall comply with the provisions of Class I materials in ZBG94002. When the pump body, pump cover and shaft sleeve are made of acid-resistant ceramic material, the performance of the ceramic material shall comply with the provisions of Class II materials in this standard. 5.2.6 When the permanent magnets are made of cobalt permanent magnet materials and neodymium iron boron permanent magnet materials, the magnetic properties shall comply with the magnetic and physical property parameters specified in Appendix A (supplement) in addition to the relevant provisions of GB4180 and BG/T13560 respectively. When the magnets are made of ferrite permanent magnet materials, the magnetic properties shall comply with the provisions of SJ285.
5.2.7 Other non-metallic materials shall comply with the provisions of the national or industry standards of the corresponding materials. If there are no national or industry standards, they shall comply with the material properties requirements specified in the drawings. 5.2.8 When foreign materials are used, their scope of use shall comply with the provisions of the corresponding specifications of the country, and there shall be a quality certificate for the material. 5.2.9 All accessories and purchased parts shall comply with the requirements of the corresponding product standards and shall have a product certificate. 5.2.10 Brittle materials should not be used for pressure-bearing parts of pumps that transport flammable and explosive media. 5.3 Manufacturing
Standard Technology Exchange Network.bza.n. Free download of various US standard industry materials1 The magnetic drive device of the pump should adopt a circular simplified structure. 4.2.2.2 The driving rotor (external magnetic rotor) and the driven rotor (internal magnetic rotor) are composed of permanent magnetic steel with radial magnetization and opposite magnetization directions. The magnetic steel is arranged alternately along the circumferential direction with different polarities and fixed on the low-carbon steel ring to form a magnetic circuit-breaking body, which is enclosed by a non-magnetic material sleeve on the outside.
The driving rotor (external magnetic rotor) can be directly fixed on the motor shaft or on the intermediate coupling shaft: the driven rotor (internal magnetic rotor) is fixed on the pump shaft.
4.2.3 Magnetic circuit design of magnetic drive device
4.2.3.1 The magnetic circuit of the magnetic drive device should generally adopt a pull-push (attraction-repulsion) combined permanent magnetic circuit. 4.2.3.2 The aspect ratio of the magnetic rotor should be optimized and should not be too large or too small, usually between 0.2 and 1. 4.2.3.3 The selection of the working gap (i.e. magnetic gap) in the magnetic circuit should be based on the actual needs of magnetic coupling when the torque is constant, and should be determined according to the performance, geometric dimensions and thickness of the isolation sleeve of the magnet. The thickness of the magnet should generally not be less than the thickness of the magnet. 4.2.3.4 The magnetic transmission torque should be calculated based on the magnetic performance parameters of the permanent magnetic material and the magnetic circuit structure. The working point of the magnet should be determined according to the dynamic magnetic circuit. The maximum static magnetic moment is calculated as twice the nominal magnetic moment. 4.2.3.5 The actual operating temperature of the magnet should be lower than the maximum operating temperature allowed by the magnet, and the size of the magnetic torque at the actual operating temperature of the magnet should be used as the basis for the design of the magnetic circuit to ensure the normal and continuous operation of the magnetic drive device. 4.2.4 Design of isolation sleeve
4.2.4.1 The isolation sleeve between the inner and outer magnetic rotors should be designed according to the design pressure of the pump body. 4.2.4.2 The isolation sleeve should be made of non-magnetic materials with high resistivity, high mechanical strength and good corrosion resistance. 4.3 Design of other main parts
4.3.1 Bracket
4.3.1.1 The bracket should have a certain rigidity, and its wall thickness should not be less than 8mm4.3.1.2 The inner cavity of the bracket should have enough space, and the distance between the outer diameter of the outer magnetic rotor and the inner diameter of the bracket should not be less than 10mm. 4.3.1.3 The bracket should be provided with vents.
4.3.2 Intermediate bearing body
4.3.2.1 The cooling chamber and the lubricating oil chamber on the intermediate bearing body should not be connected or leaking, and the gland, gasket or threaded connection should not be used to isolate the coolant from the bearing lubricant.
4.3.2.2 All holes or gaps in the intermediate bearing body that communicate with the outside should be able to prevent dust and other dirt from entering and bearing lubricating oil from leaking out under normal working conditions. Under flammable and explosive working conditions, any device that seals the bearing body must not become the source of fire (explosion). 4.3.2.3 The intermediate shaft should have sufficient size and rigidity to ensure that it can transmit the maximum torque of the motor and withstand the centrifugal force when driving the rotor to rotate.
4.3.2.4 When the intermediate bearing body is lubricated with thin oil, there should be an oil level display; an oil drain plug should be set at the bottom of the bearing box and an air vent plug should be set at the top. If refillable dry oil lubrication is used, a dry oil overflow protection device should be installed. 10.
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4.3.3 Coupling
4.3.3.1 The coupling should be an elastic coupling and an appropriate coupling cover should be installed. The cover should be designed to cover all rotating parts of the coupling.
4.3.3.2 The coupling should be able to transmit the maximum torque of the driving force, and its speed should be compatible with the speed of the driving force. 4.3.4 Base
4.3.4.1 The design of the base should be able to withstand the force and torque transmitted from the pipeline as specified in Article 4.1.6.7. 4.3.4.2 The base should generally extend below the pump and prime mover feet, and there should be a sufficient number of anchor bolt holes on the base. 4.4 Types of materials for various components
4.4.1 The body, pump cover, impeller and other flow-through parts should be made of gray cast iron, acid-resistant ferrosilicon, alkali-resistant aluminum cast iron, chromium-based stainless cast steel, chromium-based acid-resistant cast steel, chromium-manganese-nitrogen acid-resistant cast steel, nickel-containing acid-resistant cast steel, titanium alloy and other materials according to the degree of corrosion of the conveying medium. 4.4.2 The flow-through parts are made of metal materials as the base. When non-metallic materials are used, the base materials can be gray cast iron, ductile iron, carbon steel cast steel; non-metallic lining materials can be acid-resistant ceramics and thermosetting plastics such as polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene and fluorine alloys.
4.4.3 The pump shaft can be made of high-quality carbon structural steel, chromium stainless steel, nickel-based alloy steel, titanium alloy, aluminum oxide and other materials. 4.4.4 The bracket, base and intermediate bearing can be made of gray cast iron or carbon structural steel, and the intermediate bearing body should be made of high-quality carbon structural steel and other materials.
4.4, 5 The sliding bearing should be made of silicon carbide, quartz, silicified graphite, para-polyphenylene, carbon fiber reinforced tetrafluoroethylene, polyphenylene sulfide and other non-metallic materials with good wear resistance, corrosion resistance and self-lubricating properties according to the characteristics of the conveying medium. 4.4.6 The material of the inner magnetic rotor matrix can be selected from metal and non-metal materials according to the material requirements of the pump's flow-through parts: the outer magnetic rotor matrix and the inner magnetic rotor magnetic conductor can be made of carbon cable structural steel, cast steel or gray cast iron, ductile iron and other materials. 4.4.7 The isolation sleeve can be made of austenitic stainless steel, nickel-based alloy steel, chromium-based alloy steel, titanium alloy, polyperfluoroethylene propylene, polyvinylidene fluoride, glass fiber reinforced polypropylene, polymaple and other metal materials and non-metal materials and their synthetic materials. : 4.4.8 The static sealing gasket material can be made of polytetrafluoroethylene, asbestos rubber and the like. 5 Technical requirements
5.1 In addition to meeting the requirements specified in this standard, the pump shall also meet the requirements of the product drawings and technical documents approved through the prescribed procedures. 5.2 Material standards and quality
The materials of the main parts of the pump shall meet the following standard requirements and shall have a material inspection certificate. 5.2.1 Iron castings shall comply with the provisions of GB1348, GB/T6880.1, GB8491 and GB9439. 5.2.2 Steel castings shall comply with the provisions of GB2100, GB/T6880.2 and GB11352. 5.2.3 Other metal parts shall comply with the provisions of GB699, GB700 and GB1220. 5.2.4 PTFE materials shall comply with the provisions of GB7136, ZBG33033 and HG2-531. 5.2.5 When the impeller is made of acid-resistant ceramic material, its material properties shall comply with the provisions of Class I materials in ZBG94002. When the pump body, pump cover and shaft sleeve are made of acid-resistant ceramic material, the performance of the ceramic material shall comply with the provisions of Class II materials in this standard. 5.2.6 When the permanent magnets are made of cobalt permanent magnet materials and neodymium iron boron permanent magnet materials, the magnetic properties shall comply with the magnetic and physical property parameters specified in Appendix A (supplement) in addition to the relevant provisions of GB4180 and BG/T13560 respectively. When the magnets are made of ferrite permanent magnet materials, the magnetic properties shall comply with the provisions of SJ285.
5.2.7 Other non-metallic materials shall comply with the provisions of the national or industry standards of the corresponding materials. If there are no national or industry standards, they shall comply with the material properties requirements specified in the drawings. 5.2.8 When foreign materials are used, their scope of use shall comply with the provisions of the corresponding specifications of the country, and there shall be a quality certificate for the material. 5.2.9 All accessories and purchased parts shall comply with the requirements of the corresponding product standards and shall have a product certificate. 5.2.10 Brittle materials should not be used for pressure-bearing parts of pumps that transport flammable and explosive media. 5.3 Manufacturing || tt || Standard Technology Exchange Network.bza.n. Free download of various US standard industry materials1 The magnetic drive device of the pump should adopt a circular simplified structure. 4.2.2.2 The driving rotor (external magnetic rotor) and the driven rotor (internal magnetic rotor) are composed of permanent magnetic steel with radial magnetization and opposite magnetization directions. The magnetic steel is arranged alternately along the circumferential direction with different polarities and fixed on the low-carbon steel ring to form a magnetic circuit-breaking body, which is enclosed by a non-magnetic material sleeve on the outside.
The driving rotor (external magnetic rotor) can be directly fixed on the motor shaft or on the intermediate coupling shaft: the driven rotor (internal magnetic rotor) is fixed on the pump shaft.
4.2.3 Magnetic circuit design of magnetic drive device
4.2.3.1 The magnetic circuit of the magnetic drive device should generally adopt a pull-push (attraction-repulsion) combined permanent magnetic circuit. 4.2.3.2 The aspect ratio of the magnetic rotor should be optimized and should not be too large or too small, usually between 0.2 and 1. 4.2.3.3 The selection of the working gap (i.e. magnetic gap) in the magnetic circuit should be based on the actual needs of magnetic coupling when the torque is constant, and should be determined according to the performance, geometric dimensions and thickness of the isolation sleeve of the magnet. The thickness of the magnet should generally not be less than the thickness of the magnet. 4.2.3.4 The magnetic transmission torque should be calculated based on the magnetic performance parameters of the permanent magnetic material and the magnetic circuit structure. The working point of the magnet should be determined according to the dynamic magnetic circuit. The maximum static magnetic moment is calculated as twice the nominal magnetic moment. 4.2.3.5 The actual operating temperature of the magnet should be lower than the maximum operating temperature allowed by the magnet, and the size of the magnetic torque at the actual operating temperature of the magnet should be used as the basis for the design of the magnetic circuit to ensure the normal and continuous operation of the magnetic drive device. 4.2.4 Design of isolation sleeve
4.2.4.1 The isolation sleeve between the inner and outer magnetic rotors should be designed according to the design pressure of the pump body. 4.2.4.2 The isolation sleeve should be made of non-magnetic materials with high resistivity, high mechanical strength and good corrosion resistance. 4.3 Design of other main parts
4.3.1 Bracket
4.3.1.1 The bracket should have a certain rigidity, and its wall thickness should not be less than 8mm4.3.1.2 The inner cavity of the bracket should have enough space, and the distance between the outer diameter of the outer magnetic rotor and the inner diameter of the bracket should not be less than 10mm. 4.3.1.3 The bracket should be provided with vents.
4.3.2 Intermediate bearing body
4.3.2.1 The cooling chamber and the lubricating oil chamber on the intermediate bearing body should not be connected or leaking, and the gland, gasket or threaded connection shall not be used to isolate the coolant from the bearing lubricant.
4.3.2.2 All holes or gaps in the intermediate bearing body that communicate with the outside should be able to prevent dust and other dirt from entering and bearing lubricating oil from leaking out under normal working conditions. Under flammable and explosive working conditions, any device that seals the bearing body must not become the source of fire (explosion). 4.3.2.3 The intermediate shaft should have sufficient size and rigidity to ensure that it can transmit the maximum torque of the motor and withstand the centrifugal force when driving the rotor to rotate.
4.3.2.4 When the intermediate bearing body is lubricated with thin oil, there should be an oil level display; an oil drain plug should be set at the bottom of the bearing box and an air vent plug should be set at the top. If refillable dry oil lubrication is used, a dry oil overflow protection device should be installed. 10.
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4.3.3 Coupling
4.3.3.1 The coupling should be an elastic coupling and an appropriate coupling cover should be installed. The cover should be designed to cover all rotating parts of the coupling.
4.3.3.2 The coupling should be able to transmit the maximum torque of the driving force, and its speed should be compatible with the speed of the driving force. 4.3.4 Base
4.3.4.1 The design of the base should be able to withstand the force and torque transmitted from the pipeline as specified in Article 4.1.6.7. 4.3.4.2 The base should generally extend below the pump and prime mover feet, and there should be a sufficient number of anchor bolt holes on the base. 4.4 Types of materials for various components
4.4.1 The pump body, pump cover, impeller and other flow-through parts should be made of gray cast iron, acid-resistant ferrosilicon, alkali-resistant aluminum cast iron, chromium-based stainless cast steel, chromium-based acid-resistant cast steel, chromium-manganese-nitrogen acid-resistant cast steel, nickel-containing acid-resistant cast steel, titanium alloy and other materials according to the degree of corrosion of the conveying medium. 4.4.2 The flow-through parts are made of metal materials as the base. When non-metallic materials are used, the base materials can be gray cast iron, ductile iron, carbon steel cast steel; non-metallic lining materials can be acid-resistant ceramics and thermosetting plastics such as polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene and fluorine alloys.
4.4.3 The pump shaft can be made of high-quality carbon structural steel, chromium stainless steel, nickel-based alloy steel, titanium alloy, aluminum oxide and other materials. 4.4.4 The bracket, base and intermediate bearing can be made of gray cast iron or carbon structural steel, and the intermediate bearing body should be made of high-quality carbon structural steel and other materials.
4.4, 5 Sliding bearings should be made of silicon carbide, quartz, silicified graphite, para-polyphenylene, carbon fiber reinforced tetrafluoroethylene, polyphenylene sulfide and other non-metallic materials with good wear resistance, corrosion resistance and self-lubricating properties according to the characteristics of the conveying medium. 4.4.6 The material of the inner magnetic rotor matrix can be selected from metal and non-metal materials according to the material requirements of the pump's flow-through parts: the outer magnetic rotor matrix and the inner magnetic rotor magnetic conductor can be made of carbon cable structural steel, cast steel or gray cast iron, ductile iron and other materials. 4.4.7 The isolation sleeve can be made of austenitic stainless steel, nickel-based alloy steel, chromium-based alloy steel, titanium alloy, polytetrafluoroethylene propylene, polyvinylidene fluoride, glass fiber reinforced polypropylene, polymaple and other metal materials and non-metal materials and their synthetic materials. : 4.4.8 The static sealing gasket material can be made of polytetrafluoroethylene, asbestos rubber and the like. 5 Technical requirements
5.1 In addition to meeting the requirements specified in this standard, the pump shall also meet the requirements of the product drawings and technical documents approved through the prescribed procedures. 5.2 Material standards and quality
The materials of the main parts of the pump shall meet the following standard requirements and shall have a material inspection certificate. 5.2.1 Iron castings shall comply with the provisions of GB1348, GB/T6880.1, GB8491 and GB9439. 5.2.2 Steel castings shall comply with the provisions of GB2100, GB/T6880.2 and GB11352. 5.2.3 Other metal parts shall comply with the provisions of GB699, GB700 and GB1220. 5.2.4 PTFE materials shall comply with the provisions of GB7136, ZBG33033 and HG2-531. 5.2.5 When the impeller is made of acid-resistant ceramic material, its material properties shall comply with the provisions of Class I materials in ZBG94002. When the pump body, pump cover and shaft sleeve are made of acid-resistant ceramic material, the performance of the ceramic material shall comply with the provisions of Class II materials in this standard. 5.2.6 When the permanent magnets are made of cobalt permanent magnet materials and neodymium iron boron permanent magnet materials, the magnetic properties shall comply with the magnetic and physical property parameters specified in Appendix A (supplement) in addition to the relevant provisions of GB4180 and BG/T13560 respectively. When the magnets are made of ferrite permanent magnet materials, the magnetic properties shall comply with the provisions of SJ285.
5.2.7 Other non-metallic materials shall comply with the provisions of the national or industry standards of the corresponding materials. If there are no national or industry standards, they shall comply with the material properties requirements specified in the drawings. 5.2.8 When foreign materials are used, their scope of use shall comply with the provisions of the corresponding specifications of the country, and there shall be a quality certificate for the material. 5.2.9 All accessories and purchased parts shall comply with the requirements of the corresponding product standards and shall have a product certificate. 5.2.10 Brittle materials should not be used for pressure-bearing parts of pumps that transport flammable and explosive media. 5.3 Manufacturing || tt || Standard Technology Exchange Network.bza.n. Free download of various US standard industry materials5 The actual operating temperature of the magnet should be lower than the maximum allowable operating temperature of the magnet, and the size of the magnetic torque at the actual operating temperature of the magnet shall be used as the basis for the design of the magnetic circuit to ensure the normal and continuous operation of the magnetic drive device. 4.2.4 Design of the isolation sleeve
4.2.4.1 The isolation sleeve between the inner and outer magnetic rotors shall be designed according to the design pressure of the pump body. 4.2.4.2 The isolation sleeve shall be made of non-magnetic conductive materials with high resistivity, high mechanical strength and good corrosion resistance. 4.3 Design of other main components
4.3.1 Bracket
4.3.1.1 The bracket shall have a certain rigidity, and its wall thickness shall not be less than 8mm4.3.1.2 The inner cavity of the bracket shall have sufficient space, and the distance between the outer diameter of the outer magnetic rotor and the inner diameter of the bracket shall not be less than 10mm. 4.3.1.3 The bracket shall be provided with a vent.
4.3.2 Intermediate bearing body
4.3.2.1 The cooling chamber and lubricating oil chamber on the intermediate bearing body should not be connected or leak. The gland, gasket or threaded connection shall not be used to isolate the coolant from the bearing lubricant.
4.3.2.2 All holes or gaps in the intermediate bearing body that communicate with the outside should be able to prevent dust and other dirt from entering and the bearing lubricating oil from leaking out under normal working conditions. Under flammable and explosive working conditions, any device that seals the bearing body shall not become the source of fire (detonation). 4.3.2.3 The intermediate shaft should have sufficient size and rigidity to ensure that it can transmit the maximum torque of the motor and withstand the centrifugal force when driving the rotor to rotate.
4.3.2.4 When the intermediate bearing body is lubricated with thin oil, there should be an oil level display; an oil drain plug should be set at the bottom of the bearing box and an air vent plug should be set at the top. If refillable dry oil lubrication is used, a dry oil overflow protection device should be installed. 10.
Standard Jieyuan Network.bxaosncor Various standard industry information free download HG/T2730-~95
4.3.3 Coupling
4.3.3.1 The coupling should be an elastic coupling and an appropriate coupling cover should be installed. The cover should be designed to cover all rotating parts of the coupling.
4.3.3.2 The coupling should be able to transmit the maximum torque of the driving force, and its speed should be compatible with the speed of the driving force. 4.3.4 Base
4.3.4.1 The design of the base should be able to withstand the force and torque transmitted from the pipeline as specified in Article 4.1.6.7. 4.3.4.2 The base should generally extend below the pump and prime mover feet, and there should be a sufficient number of anchor bolt holes on the base. 4.4 Types of materials for various components
4.4.1 The body, pump cover, impeller and other flow-through parts should be made of gray cast iron, acid-resistant ferrosilicon, alkali-resistant aluminum cast iron, chromium-based stainless cast steel, chromium-based acid-resistant cast steel, chromium-manganese-nitrogen acid-resistant cast steel, nickel-containing acid-resistant cast steel, titanium alloy and other materials according to the degree of corrosion of the conveying medium. 4.4.2 The flow-through parts are made of metal materials as the base. When non-metallic materials are used, the base materials can be gray cast iron, ductile iron, carbon steel cast steel; non-metallic lining materials can be acid-resistant ceramics and thermosetting plastics such as polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene and fluorine alloys.
4.4.3 The pump shaft can be made of high-quality carbon structural steel, chromium stainless steel, nickel-based alloy steel, titanium alloy, aluminum oxide and other materials. 4.4.4 The bracket, base and intermediate bearing can be made of gray cast iron or carbon structural steel, and the intermediate bearing body should be made of high-quality carbon structural steel and other materials.
4.4, 5 Sliding bearings should be made of silicon carbide, quartz, silicified graphite, para-polyphenylene, carbon fiber reinforced tetrafluoroethylene, polyphenylene sulfide and other non-metallic materials with good wear resistance, corrosion resistance and self-lubricating properties according to the characteristics of the conveying medium. 4.4.6 The material of the inner magnetic rotor matrix can be selected from metal and non-metal materials according to the material requirements of the pump's flow-through parts: the outer magnetic rotor matrix and the inner magnetic rotor magnetic conductor can be made of carbon cable structural steel, cast steel or gray cast iron, ductile iron and other materials. 4.4.7 The isolation sleeve can be made of austenitic stainless steel, nickel-based alloy steel, chromium-based alloy steel, titanium alloy, polytetrafluoroethylene propylene, polyvinylidene fluoride, glass fiber reinforced polypropylene, polymaple and other metal materials and non-metal materials and their synthetic materials. : 4.4.8 The static sealing gasket material can be made of polytetrafluoroethylene, asbestos rubber and the like. 5 Technical requirements
5.1 In addition to meeting the requirements specified in this standard, the pump shall also meet the requirements of the product drawings and technical documents approved through the prescribed procedures. 5.2 Material standards and quality
The materials of the main parts of the pump shall meet the following standard requirements and shall have a material inspection certificate. 5.2.1 Iron castings shall comply with the provisions of GB1348, GB/T6880.1, GB8491 and GB9439. 5.2.2 Steel castings shall comply with the provisions of GB2100, GB/T6880.2 and GB11352. 5.2.3 Other metal parts shall comply with the provisions of GB699, GB700 and GB1220. 5.2.4 PTFE materials shall comply with the provisions of GB7136, ZBG33033 and HG2-531. 5.2.5 When the impeller is made of acid-resistant ceramic material, its material properties shall comply with the provisions of Class I materials in ZBG94002. When the pump body, pump cover and shaft sleeve are made of acid-resistant ceramic material, the performance of the ceramic material shall comply with the provisions of Class II materials in this standard. 5.2.6 When the permanent magnets are made of cobalt permanent magnet materials and neodymium iron boron permanent magnet materials, the magnetic properties shall comply with the magnetic and physical property parameters specified in Appendix A (supplement) in addition to the relevant provisions of GB4180 and BG/T13560 respectively. When the magnets are made of ferrite permanent magnet materials, the magnetic properties shall comply with the provisions of SJ285.
5.2.7 Other non-metallic materials shall comply with the provisions of the national or industry standards of the corresponding materials. If there are no national or industry standards, they shall comply with the material properties requirements specified in the drawings. 5.2.8 When foreign materials are used, their scope of use shall comply with the provisions of the corresponding specifications of the country, and there shall be a quality certificate for the material. 5.2.9 All accessories and purchased parts shall comply with the requirements of the corresponding product standards and shall have a product certificate. 5.2.10 Brittle materials should not be used for pressure-bearing parts of pumps that transport flammable and explosive media. 5.3 Manufacturing
Standard Technology Exchange Network.bza.n. Free download of various US standard industry materials5 The actual operating temperature of the magnet should be lower than the maximum allowable operating temperature of the magnet, and the size of the magnetic torque at the actual operating temperature of the magnet shall be used as the basis for the design of the magnetic circuit to ensure the normal and continuous operation of the magnetic drive device. 4.2.4 Design of the isolation sleeve
4.2.4.1 The isolation sleeve between the inner and outer magnetic rotors shall be designed according to the design pressure of the pump body. 4.2.4.2 The isolation sleeve shall be made of non-magnetic conductive materials with high resistivity, high mechanical strength and good corrosion resistance. 4.3 Design of other main components
4.3.1 Bracket
4.3.1.1 The bracket shall have a certain rigidity, and its wall thickness shall not be less than 8mm4.3.1.2 The inner cavity of the bracket shall have sufficient space, and the distance between the outer diameter of the outer magnetic rotor and the inner diameter of the bracket shall not be less than 10mm. 4.3.1.3 The bracket shall be provided with a vent.
4.3.2 Intermediate bearing body
4.3.2.1 The cooling chamber and lubricating oil chamber on the intermediate bearing body should not be connected or leak. The gland, gasket or threaded connection shall not be used to isolate the coolant from the bearing lubricant.
4.3.2.2 All holes or gaps in the intermediate bearing body that communicate with the outside should be able to prevent dust and other dirt from entering and the bearing lubricating oil from leaking out under normal working conditions. Under flammable and explosive working conditions, any device that seals the bearing body shall not become the source of fire (detonation). 4.3.2.3 The intermediate shaft should have sufficient size and rigidity to ensure that it can transmit the maximum torque of the motor and withstand the centrifugal force when driving the rotor to rotate.
4.3.2.4 When the intermediate bearing body is lubricated with thin oil, there should be an oil level display; an oil drain plug should be set at the bottom of the bearing box and an air vent plug should be set at the top. If refillable dry oil lubrication is used, a dry oil overflow protection device should be installed. 10.
Standard Jieyuan Network.bxaosncor Various standard industry information free download HG/T2730-~95
4.3.3 Coupling
4.3.3.1 The coupling should be an elastic coupling and an appropriate coupling cover should be installed. The cover should be designed to cover all rotating parts of the coupling.
4.3.3.2 The coupling should be able to transmit the maximum torque of the driving force, and its speed should be compatible with the speed of the driving force. 4.3.4 Base
4.3.4.1 The design of the base should be able to withstand the force and torque transmitted from the pipeline as specified in Article 4.1.6.7. 4.3.4.2 The base should generally extend below the pump and prime mover feet, and there should be a sufficient number of anchor bolt holes on the base. 4.4 Types of materials for various components
4.4.1 The body, pump cover, impeller and other flow-through parts should be made of gray cast iron, acid-resistant ferrosilicon, alkali-resistant aluminum cast iron, chromium-based stainless cast steel, chromium-based acid-resistant cast steel, chromium-manganese-nitrogen acid-resistant cast steel, nickel-containing acid-resistant cast steel, titanium alloy and other materials according to the degree of corrosion of the conveying medium. 4.4.2 The flow-through parts are made of metal materials as the base. When non-metallic materials are used, the base materials can be gray cast iron, ductile iron, carbon steel cast steel; non-metallic lining materials can be acid-resistant ceramics and thermosetting plastics such as polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene and fluorine alloys.
4.4.3 The pump shaft can be made of high-quality carbon structural steel, chromium stainless steel, nickel-based alloy steel, titanium alloy, aluminum oxide and other materials. 4.4.4 The bracket, base and intermediate bearing can be made of gray cast iron or carbon structural steel, and the intermediate bearing body should be made of high-quality carbon structural steel and other materials.
4.4, 5 The sliding bearing should be made of silicon carbide, quartz, silicified graphite, para-polyphenylene, carbon fiber reinforced tetrafluoroethylene, polyphenylene sulfide and other non-metallic materials with good wear resistance, corrosion resistance and self-lubricating properties according to the characteristics of the conveying medium. 4.4.6 The material of the inner magnetic rotor matrix can be selected from metal and non-metal materials according to the material requirements of the pump's flow-through parts: the outer magnetic rotor matrix and the inner magnetic rotor magnetic conductor can be made of carbon cable structural steel, cast steel or gray cast iron, ductile iron and other materials. 4.4.7 The isolation sleeve can be made of austenitic stainless steel, nickel-bas
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