Some standard content:
Mechanical Industry Standard of the People's Republic of China
Small Magnetic Drive Centrifugal Pump
1 Subject Content and Scope of Application
JB/T 7742-95
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, product sets and use guarantees, marking, packaging, transportation and storage of small magnetic drive centrifugal pumps (referred to as pumps). This standard applies to pumps that transport flammable, explosive, volatile, toxic, corrosive and precious liquids. This standard does not apply to pumps that transport liquids containing magnetic substances or hard solid particles. In cases where this standard has been required to be applied, but it is required not to fully comply with this standard, a design that meets the intent of this standard can be proposed, but the differences need to be explained in detail. If a data sheet is required, please refer to Appendix A (reference). 2 Reference standards
GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection)GB3216 Test methods for centrifugal pumps, mixed flow pumps, axial flow pumps and rotary pumpsGB/T3217 Magnetic test methods for permanent magnetic (hard magnetic) materialsGB4180 Rare earth diamond permanent magnetic material series
GB4216 Gray cast iron pipe flange dimensions
GB 4879
Rust-proof packaging
GB/T5656 Technical conditions for centrifugal pumps (Class I)GB9239 Determination of allowable imbalance for rigid rotor balancing qualityGB 10889
Measurement and evaluation methods for vibration of pumps
Measurement and evaluation methods for noise of pumps
GB 10890
GB/T13306 Labels
GB/T 13384
General technical conditions for packaging of electromechanical products
JB/T 4297
Technical conditions for painting of pump products
JB/T 6880. 1
Gray iron castings for pumps
Steel castings for pumps
JB/T 6880. 2
SJ285 Permanent ferrite materials
3 Types and basic parameters
3.1 TypebZxz.net
The pump is a single-stage, single-suction horizontal type
The suction port of the pump is axial suction and the discharge port is upward discharge. The pump and the motor transmit power through a magnetic coupling (a combination of internal and external magnetic steel).
3.2 Model
Model representation method:
622 approved by the Ministry of Machinery Industry of the People's Republic of China on June 20, 1995
Implementation on January 1, 1996
Example:
JB/T 7742--95
-Impeller nominal diameter, mm
Discharge diameter, mm
Suction port diameter, mm
Material code, when the pump body and impeller are made of metal or with non-metallic lining, the material code is B; when the pump body and impeller are made of non-metallic material, the material code is F Small magnetic drive centrifugal pump
The suction port diameter is 50mm, the discharge port diameter is 32mm, the impeller nominal diameter is 105mm, and the pump Small magnetic drive centrifugal pump with metal body and impeller or non-metal lining: CQB50-32-105
Suction port diameter is 50mm, discharge port diameter is 32mm, impeller nominal diameter is 105mm, small magnetic drive centrifugal pump with non-metal body and impeller:
CQF50-32-105
3.3 Basic parameters
3.3.1 The basic parameters of the pump shall comply with the provisions of Table 1. The performance parameters of the pump in Table 1 are the performance under normal temperature and clean water conditions. 3.3.2 The working performance range of the pump is shown in Figure 1. Table 1
Suction port diameter
Impeller nominal diameter
Flow rate Q
Head H
Required NPSH
Speed n
Unit efficiency 7
Non-metal isolation sleeve
Metal isolation sleeve
Suction port diameter
Discharge port diameter
4 Technical requirements
JB/T 7742—95
Continued Table 1
Flow Q
Impeller nominal diameter!
Head H
Required NPSH
Speed n
Unit efficiency n
Non-metallic isolation sleeve
Metallic isolation sleeve
4.1 Performance curve
The performance curve should show the allowable working range of the pump. The pump has a stable performance curve. The performance curve diagram should be drawn for the performance curves at the maximum and minimum impeller outer diameters.
4.2 NPSH (NPSH)
JB/T 7742—95
921-99-08
g-0-9 4
7091-09-99
-0F-99
0- 8--0
01-2e-0
2 901-9-0
3-20-05
91-9-0
98-0-2898-91-52
-91-00
98-9-08
901-02-28|| tt||-9k -0 -2e
L 21-91-98
-091-02-78
90-9-02
SF-01-ST
99-01-91
9~01-97
98-01-5
-01-01
99-01-01
59-01-01
S2-01-01
JB/T 7742—95
If not otherwise agreed, the required NPSH R should be based on the clean water at room temperature specified in Article 3.2 of GB3216. If the manufacturer believes that a larger effective NPSH R is required due to the material used by the pump or the working medium it conveys, this should be stated in the bid and indicated on the performance curve provided. The effective NPSH R should be at least 0.5m larger than the required NPSH R. 4.3 Installation
The pump should be suitable for outdoor installation under normal environmental conditions. If the pump is required to be suitable for abnormal local environmental conditions, such as high or low temperatures, corrosive environments, sandstorms, etc., the buyer should jointly agree with the pump manufacturer on the installation conditions required. 4.4 Prime mover and magnetic drive
4.4.1 Prime mover power
The prime mover power of the pump should comply with the provisions of Article 4.2 of GB/T5656. Only for the matching power less than 1kW, appropriate margin should be reserved as appropriate, and the power reserve can also be determined through negotiation with the buyer. 4.4.2 Magnetic transmission
Magnetic transmission should consider the following working conditions: a. At the operating temperature of the magnetic transmission device, according to the allowable working range of the pump, the medium density should be not less than 1kg/dm; b. The heat generated by the electric current in the magnetic transmission should be taken away by the medium transported by the pump or by external cooling water; c. The working temperature of the magnetic material should be within the allowable use range of the material. d. If the pump rotor is stuck during operation, the rapid heating of the internal magnetic components caused by this should be considered. 4.5 Critical speed, balance and vibration
4.5.1 Critical speed
Under working conditions, the actual first lateral critical speed of the rotor should exceed the operating speed by at least 10%. 4.5.2 Balance
The rotating parts and magnetic couplings of the pump should be subjected to mass balance tests. The balance level should not be lower than G6.3 level specified in GB9239. If the rotating parts are assembled together for dynamic balancing, permanent and significant marks shall be used to indicate their correct assembly position. 4.5.3 Vibration
The vibration intensity of the pump shall not exceed the provisions of Class C in GB10889. The vibration measurement shall be measured at the rated speed (±5%) and rated flow (±5%) and when no cavitation occurs at the operating point. 4.6 Noise
The noise level of the pump shall not exceed the provisions of Class C in GB10890. 4.7 Pressure-bearing parts
4.7.1 Pressure
The manufacturer shall specify the rated pressure of the pump under the worst working conditions. In any case, the rated pressure of the pump shall not exceed the nominal pressure of the pump flange.
4.7.2 Rated pressure and temperature of the pump
4.7.2.1 If the pump housing is made of metal or with non-metallic lining, the maximum operating temperature shall not exceed 80℃, and the rated pressure of the pump is 1.6 MPa.
4.7.2.2 If the pump housing is made of non-metallic material, the maximum operating temperature shall not exceed 60°C and the rated pressure of the pump shall be 0.6MPa; when the pump housing is made of high-strength engineering plastic, the rated pressure of the pump is 1.6MPa when the maximum operating temperature does not exceed 80℃4.7.3 Pump suction pressure
4.7.3.1 If the pump housing is made of metal or with non-metallic lining, the pump suction pressure should not exceed 0.2MPa. 4.7.3.2 If the pump housing is made of non-metallic material, the pump suction pressure should not exceed 0.1MPa. 4.7.4 Wall thickness
Parts that bear liquid pressure should have sufficient thickness to withstand the rated pressure and allowable deformation at the operating temperature, and withstand the test pressure and allowable deformation at ambient temperature during the water pressure test. 626
4.7.5 Structural requirements
JB/T 7742--95
4.7.5.1 In order to make it easy to separate the components, when using jack screws to disassemble and separate the components, the mating surface should be processed with a concave flat-bottomed strontium hole that can accommodate the jack screws to prevent leakage or poor fit on the mating surface. 4.7.5.2 The design of the shell gasket should be suitable for the rated working conditions and water pressure test conditions at ambient temperature. The shell gasket should be limited by the shell and should be able to prevent sudden discharge or leakage on the atmospheric side under pressure conditions. 4.8 Suction and discharge pipes and auxiliary pipeline connections 4.8.1 Suction and discharge pipes
The flanges of the suction and discharge pipes should always be able to withstand a pressure not less than the rated pressure of the pump. 4.8.2 Vent holes, pressure gauge joints and discharge liquid joints In general, vent holes should be set on the pump. If the pump is not equipped with vent holes, vent holes should be set on the pipes higher than the pump. The pipes of the suction and discharge ports should be equipped with pressure gauge holes and should be equipped with screw plugs or plugging parts. The joints for discharging liquid should be set at the lowest position or several low positions of the pump and should be equipped with screw plugs or plugging parts. 4.8.3 Plug parts
The material of the plug parts (screw plugs, blind flanges, etc.) should be able to adapt to the medium transported by the pump. And the risk of biting the materials in contact with them should be minimized.
All orifices in contact with the transported liquid should be equipped with plugs that can be disassembled and can meet the requirements of blocking the medium under working pressure. 4.8.4 Auxiliary pipeline connections
All auxiliary pipeline connections should be made of materials that meet the predetermined functional requirements and should have sufficient size and wall thickness. 4.8.5 Identification of connectors
Connectors should be selectively identified on the installation drawing according to their functions and effects. 4.9 External forces and external moments acting on the pump suction and discharge flanges The external forces and external moments acting on the flanges should comply with the provisions of Article 4.6 of GB/T5656. 4.10 Connection of pump and pipe
The connection method of the pump suction and discharge can be flange connection, threaded connection, or hose connection according to the size of the pump suction port diameter. If the pump and pipe are flanged, the flange size should comply with the provisions of GB4216. 4.11 Impeller
4.11.1 Impeller design
According to the purpose and structural characteristics, the impeller can be selected as closed, semi-open or open. 4.11.2 Fixing of impeller
The impeller should be reliably fixed.
4.12 Running clearance
4.12.1 General
When determining the running clearance between stationary and rotating parts, the operating conditions and the properties of the materials used for the parts (such as hardness and wear resistance) should be taken into account. The size of the clearance should prevent contact under operating conditions. The material combination should be selected to minimize the risk of wear and seizure. 4.12.2 Clearance of the sealing ring of the pump body and impeller If the sealing ring of the pump body and impeller is made of metal, the clearance at the sealing ring shall comply with the provisions of Table 2. Table 2
Inner diameter of the pump body sealing ring
Clearance (radial total clearance)
4.12.3 Clearance between magnetic coupling and isolating sleeve>80～110
>110～140
The clearance between the magnetic coupling and the isolating sleeve should be based on the principle that no silting occurs and normal operation is guaranteed. The difference between the inner diameter of the outer magnetic steel and the outer diameter of the inner magnetic steel is generally within the range of 4 to 8 mm. 627
4.13 Pump shaft
JB/T 7742—95
According to the structural characteristics of the pump, the pump shaft can be a rotating pump shaft type or a non-rotating pump shaft type. The pump shaft should have a sufficient shaft diameter to meet the strength and rigidity requirements. 4.14 Sliding bearing
The inner diameter and thrust surface of the bearing should be provided with grooves for cooling and lubrication. The normal operation and service life of the bearing should not be affected by poor bearing cooling or lubrication.
The heat generated by the bearing should be fully taken away by the cooling or lubricating medium, and no bubbles are allowed to adhere to the sliding bearing. The bearing should have a certain degree of corrosion resistance and wear resistance to meet the normal operation and service life of the pump. 4.15 Magnetic coupling
Magnetic coupling shall meet the following requirements:
a. The maximum transmission magnetic torque shall meet the maximum required power of the pump; b. The limiting speed shall be compatible with the speed of the pump; c. The active and passive components of the magnetic coupling shall be designed to be easily disassembled and separated from the pump and motor; d. The manufacture of internal and external magnetic steel shall comply with the provisions of relevant standards; e. The working point of the permanent magnetic material shall be located on the maximum magnetic energy product (BH) mx of the demagnetization curve: f. The permanent magnet shall be aged after magnetization to stabilize its magnetic properties, and the decrease in magnetic flux density after treatment shall not exceed 5%;
g: The internal and external magnetic steel of the magnetic coupling shall be balanced and tested, with a tolerance of ±5%. The magnetic flux of each magnetic steel can also be tested, and the difference between them shall not exceed ±5%.
4.16 Base
The base without grouting shall have sufficient rigidity to meet the requirements of direct installation on the foundation. The base should be able to withstand the additional external forces and external moments specified in 4.9.
The base that needs grouting should be designed to ensure correct grouting (such as preventing gas accumulation, etc.). The diameter of the grouting hole should not be less than 100mm or an area equivalent to this.
4.17 Materials
4.17.1 Selection and determination of pump materials
4.17.1.1 The selection of pump materials should usually be determined by the pump manufacturer based on the working medium and intended use of the pump unless the buyer has other requirements for the material.
4.17.1.2 If the pump material is selected by the buyer, it can be specified in detail on the data sheet. However, if the manufacturer believes that another material is more suitable, the alternative material can be detailed according to the working conditions specified in the data sheet, and the buyer's approval should be obtained. 4.17.1.3 The materials used for hazardous liquids shall be agreed upon by the buyer and the pump manufacturer. Brittle materials should not be used for pressure-bearing parts of pumps that transport flammable and explosive liquids.
4.17.1.4 Pump manufacturers should give due consideration to the material properties and mechanical design of pumps used in low-temperature applications (i.e., below -10°C).
4.17.1.5 The corrosion resistance level of the isolation sleeve material should not be lower than that of the pump body impeller. Non-metallic materials should be used as much as possible under the conditions of working medium temperature and pressure.
4.17.2 Requirements for magnetic materials of magnetic couplings 4.17.2.1 When rare earth diamond permanent magnet materials are used, the magnetic properties should comply with the provisions of GB4180. 4.17.2.2 When ferrite permanent magnet materials are used, the magnetic properties should comply with the provisions of SJ285. 4.17.2.3 When NdFeB permanent magnet materials are used as magnetic materials, they should comply with the provisions of relevant standards. 4.18 Quality of pump castings
The quality of gray iron castings for pumps should comply with the provisions of JB/T6880.1. The quality of steel castings for pumps shall comply with the provisions of JB/T6880.2. 628
JB/T 7742-95
If titanium alloy and corrosion-resistant metal materials other than those specified in this standard are selected for pump castings, the quality of castings shall comply with the provisions of relevant standards.
4.19 Quality of non-metallic materials
Non-metallic materials used in pumps shall comply with the quality standards of relevant materials. 5 Test methods
5.1 Material tests
Material tests shall comply with the provisions of relevant standards. The following tests or test certificates can be provided upon request: chemical composition;
b. Mechanical properties;
Sensitivity to intergranular corrosion;
d. Non-destructive test.
5.2 Magnetic material test
The magnetic test method of permanent magnetic (hard magnetic) materials shall comply with the provisions of GB/T3217. 5.3 Water pressure test
5.3.1 The shell that bears liquid pressure should be subjected to water pressure test. The water pressure test pressure of the pump body is 1.5 times the design pressure of the pump. The water pressure test pressure of the isolation sleeve is 1.25 times the design pressure of the pump. 5.3.2 The water pressure test is carried out with clean water at ambient temperature (the minimum temperature for testing carbon steel materials is 15℃). The duration of the test pressure should be no less than 10 minutes, and there should be no water leakage or sweating. 5.4 Performance test
The performance test method of the pump shall comply with the provisions of GB3216. 5.5 Vibration measurement
The vibration measurement method of the pump shall comply with the provisions of GB10889. 5.6 Noise measurement
The noise measurement method of the pump shall comply with the provisions of GB10890. 6 Inspection rules
The inspection of the pump is divided into type inspection and factory inspection. The contents of type inspection and factory inspection shall comply with the provisions of Article 3.1 of GB3216. 6.1 Type inspection
Type inspection shall generally be carried out in any of the following situations: new products or old products are transferred to the factory for trial production and identification; a.
After formal production, the structure, materials, and processes have changed significantly, which may affect the product performance; b.
Periodic inspection of mass production;
d. When the product is resumed after a long period of suspension; e. When the factory inspection results are significantly different from the last type inspection. 6.2 Factory inspection
6.2.1 Products produced in batches shall be inspected at the factory. 6.2.2 Inspection number and sampling rules According to the provisions of GB2828, the sampling method can adopt one-time or two-time sampling, and the inspection level AQL is 4.
7 Product set and use guarantee
7.1 Product set
Users can order all or part of the following set range according to their needs, and should indicate it in the order form. The scope of supply includes: 629
Pump and motor:
b. Base;
Spare parts and other accessories.
7.2 Warranty period
JB/T 7742--95
Under the condition that the buyer complies with the rules for transportation, storage, installation and use of the pump, within 18 months from the date of shipment from the manufacturer, and the use period shall not exceed 12 months, if the product is damaged or fails to work properly due to poor manufacturing quality, the manufacturer shall be responsible for repairing or replacing parts or products for the buyer.
8 Marking, packaging, transportation and compensation for storage
8.1 Marking
8.1.1 Each pump shall have a product label in a conspicuous position. The size and technical requirements of the label shall comply with the provisions of GB/T13306. The label shall be made of materials resistant to environmental corrosion. The label shall include the following information: a.
Manufacturer name and trademark;
Pump model and name;
Main parameters of the pump:
Required NPSH Ratio NPSHR
Pump mass
d. Factory serial number and manufacturing date of the pump.
8.1.2 The rotation direction of the pump shall be indicated by a red rib in an appropriate and obvious position (cast or nailed on a separate label). 8.2 Packaging
8.2.1 Preparations to be made before packaging:
Requirements;
If there is water inside the pump, it should be removed;
If the buyer does not make special requirements, the pump coating should be in accordance with the provisions of JB/T4297; the anti-rust treatment of the pump should comply with the relevant provisions of GB4879. If the buyer does not make any requirements, the anti-rust validity period should comply with the suction and discharge ports of the D-class pump. The plugging parts should be resistant to wind and rain erosion and can withstand accidental damage. The technical documents accompanying each pump when it leaves the factory, such as product certificates, packing lists, instruction manuals, etc., should be sealed in waterproof bags. 8.2.2 The packaging of the pump should comply with the provisions of GB/T13384. 8.2.3 When packaging the pump and spare parts and accessories, they should be reliably fixed to prevent collisions. 8.2.4 Protective measures should be taken for the packaging of bare magnets or assembly parts. 8.3 Transportation
During transportation, measures should be taken to prevent vibration or collision from causing damage to the product or packaging box. 8.4 Storage
The pump should be protected from rust and damage during storage. The pump should be inspected and re-treated according to the rust prevention period. 9 Instructions for Use
The instructions for use should include information to let people know about the potential hazards of the magnetic field of permanent magnetic components, such as: pacemakers, credit cards, calculators, computer disks, watches, etc. should be kept away. 630
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