Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T6667.2-1993
Volute Mixed Flow Pump
Published on 1993-06-04
Technical Conditions
Implemented on 1994-01-01
Ministry of Machinery Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Volute Mixed Flow Pump
1 Subject Content and Scope of Application
Technical Conditions
JB/T6667.21993
This standard specifies the technical requirements, test methods, inspection rules and markings, packaging, etc. of volute mixed flow pumps. This standard applies to volute mixed flow pumps (hereinafter referred to as pumps) with a flow rate of 90~3654m/h, a head of 3~12.5m, and a conveying temperature of no more than 50℃ for clean water or water that meets the requirements of GB5084. 2
Quoted standards
GB 699
GB 977
GB1031
GB1184
GB1801
GB/T1804
GB2828
GB4216
GB5084| |tt||GB5661
GB9239
GB9439
GB10889
GB10890
GB/T13306
GB/T13384
JB4297
JB/T 6667.1
3 Technical requirements
3.1 General requirements
Rolling bearings
Deep groove ball bearings
Overall dimensions
General technical requirements for rolling bearings
Technical conditions for high-quality carbon structural steel
Mechanical properties test methods for grey cast iron
Surface roughness parameters and their values
Form and position tolerancesTolerances and fits without tolerancesTolerances and fits of dimensions up to 500 mmTolerances and fits of holes and shaftsGeneral tolerancesTolerances without tolerances of linear dimensions
Batch inspectionCount sampling procedures and sampling tables (applicable to inspection of continuous batches)Centrifuge Test methods for pumps, mixed flow pumps, axial flow pumps and vortex pumps. Dimensions of flanges for grey cast iron pipes
Water quality standards for farmland irrigation
Dimensions of cavities for mechanical seals and soft packings in axial suction centrifugal pumps. Determination of allowable imbalance for rigid rotor balance quality. Grey cast iron parts
Methods for measuring and evaluating vibration of pumps
Methods for measuring and evaluating noise of pumps
General technical conditions for packaging of electromechanical products
Technical conditions for painting of pump products
Types and basic parameters of volute mixed flow pumps
3.1.1 The pump shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.1.2 The maximum working pressure of the pump shall not be greater than the nominal pressure of the pump inlet and outlet flanges. 3.1.3 The manufacturer shall provide the performance curve of each pump (the relationship curve between head, efficiency, shaft power, NPSH and flow rate). The recommended range of use of the pump is 0.75Q%~1.2Q% (Q is the flow rate at the specified point). Approved by the Ministry of Machinery Industry on June 4, 1993
Implemented on January 1, 1994
JB/T 6667.21993
The power reserve coefficient of the power machine supporting the pump is generally 1.1 to 1.3.3.2 Performance
The basic parameters of the specified performance points of the pump shall comply with the provisions of JB/T6667.1. The deviation of the basic parameters of the pump shall comply with the provisions of Class C in GB3216. 3.2.2
3.3 Structure
The structural type of the pump shall comply with the provisions of JB/T6667.1. The flange connection dimensions of the inlet and outlet of the pump shall comply with the provisions of GB4216. The pump body shall generally be made in the form of "front opening" or "rear opening". The pump body shall be provided with water diversion holes, water discharge holes and exhaust holes. The impeller should be reliably fixed on the shaft and should not move in the circumferential and axial directions relative to the shaft. The pump cover and bearing body should be provided with screw holes for removing the cover. The center holes at both ends of the pump shaft should be retained, and the screw thread on the pump shaft should be tightened when the pump shaft rotates in the specified direction. A water retaining ring should be installed on the pump shaft.
3.4 Seal
Inlet seal
The impeller inlet of the pump generally adopts end face seal, and cylindrical seal can also be adopted. The end face seal clearance should comply with the provisions of Table 1, and the cylindrical seal clearance should comply with the provisions of Table 2.
Inlet diameter
≥80~180
>180~315Www.bzxZ.net
>315~500
>500~750
Nominal diameter of sealing surface
≥80~180
>180~315
>315~500
>500~750
regulations.
3. 4. 2.2
End face seal clearance
0.10~0.40
0.20~0.50
0.20~0.60
0.20~0.70
Cylindrical face seal clearance
The shaft seal can be a soft packing seal, a skeleton rubber oil seal or a single end face mechanical seal. The cavity size of the shaft seal shall comply with GB5661. When a soft packing seal or a skeleton rubber oil seal is used, there shall be a shaft sleeve on the shaft, and the sleeve surface shall not have scratches, rust spots and other defects. 3.5 Bearings and lubrication
The pump adopts deep groove ball bearings in accordance with GB276, and the bearing manufacturing quality shall comply with GB307.3. The use temperature of the bearing shall not exceed the ambient temperature of 40℃, and the maximum working temperature shall not exceed 75℃. The bearings are lubricated with grease or lubricating oil. When lubricating with grease, an oil cup or oil plug should be provided. When lubricating with oil, an oil level indicator or oil mark should be provided. An oil drain plug should be provided at the lower part of the bearing body. 3.5.4
Lubricating oil or grease should be replaced regularly.
3.6 Coupling and pulley
JB/T 6667.2—1993
3.6.1 The pump can be directly driven by the prime mover through an elastic coupling, and a coupling protection device should be provided. The installation accuracy of the coupling should comply with the provisions of the relevant standards.
The two halves of the coupling should be securely fixed on the shaft and should not move in the axial and circumferential directions relative to the shaft. 3.6.2 The pump can also be driven by the prime mover through a pulley. The pulley should be securely fixed on the shaft and should not move in the axial and circumferential directions relative to the shaft. A protection device should be provided. The outer diameter of the pulley should meet the requirements of the specified speed of the pump. 3.7 Materials and purchased parts
3.7.1 The materials and purchased parts used in the pump must be certified or have a valid quality assurance certificate before they can be used. 3.7.2 The impeller, pump body, sealing ring, pump cover, bearing body and sleeve shall be made of materials with performance not lower than HT200 specified in GB9439.
3.7.3 The pump shaft shall be made of materials with performance not lower than 45 steel specified in GB699 and shall be quenched and tempered. 3.8 Casting quality and dimensional deviation
3.8.1 The technical requirements for castings shall comply with the provisions of GB9439. 3.8.2 The casting dimensional tolerances of the impeller and pump body flow channel shall comply with the provisions of Figure 1 and Table 3. 3.9 Tolerance and fit, surface roughness
3.9.1 The fit accuracy of the shaft neck that matches the bearing is Grade 6 as specified in GB1801, and the surface roughness is 1.6μm as specified in GB1031
The fit accuracy of the impeller, pulley, coupling inner hole and bearing body inner hole that match the shaft, and the shaft neck that matches the impeller is Grade 7 as specified in GB1801, and the surface roughness is 3.2um as specified in GB1031. 3.9.2 The fit accuracy of each main joint surface such as the stopper, sleeve, inner and outer cylindrical surface of the sealing ring is Grade 8 for the hole, Grade 7 for the outer cylindrical surface, and the surface roughness is 6.3um.
3.9.3 The limit deviation of the machining dimensions without tolerance shall comply with the provisions of GB/T1804, generally Grade m (medium grade). 3.10 Surface shape and position tolerance
The tolerance value of radial or end face round runout of the mating surfaces of the main parts such as impeller, pump body, sealing ring, pump cover, shaft, bearing body and sleeve is Grade 8 as specified in GB1184. The symmetry of the two sides of the shaft keyway facing the axis is Grade 8, and the symmetry of the two sides of the keyway of the impeller, coupling and pulley facing the axis is Grade 9.
Part Name
JB/T 6667.21993
D,、D2
Inlet diameter
Outlet width
Blade inlet and outlet thickness
Blade inlet and outlet pitch
Inlet and outlet diameter
Nominal size
≤120
>120~280
>280~450
>450~1000
>80~200
>200~400
>400~800
>15~30
>30~50
>50~120||tt ||>120~280
>10~18
>80~220
>220~450
>450~800
>80~200
>200~400
>400~700
Allowable tolerance
Part name
JB/T6667.2—1993
Continued Table 3
Center distance of outlet flange
Center distance of section on parting surface
Note: 1) Thickness S is the true thickness or normal thickness of the blade. 3.11 Static balance
Nominal size
≤120
>120~250
>250~450
>450~1000
>80~280
>280~450
>450~1200
Allowable tolerance
3.11.1 Rotating parts such as impellers, couplings and pulleys shall be statically balanced. The balance quality level shall not be lower than that specified in G6.3 in Figure 2. The balancing weight on the maximum outer diameter of the balancing part shall not exceed the calculated value of formula (1): AW
Where: e
permissible eccentricity, μm;
balancing weight at the maximum outer diameter, g;
—balancing part weight, kg;
maximum outer diameter of the balancing part, mm.
: (1)
3.11.2 Balance can be obtained by cutting off excess metal as specified in the drawing. The thickness of the impeller cover plate cut off shall not exceed one third of the original thickness.
When the balancing weight at the maximum outer diameter of the balancing part obtained by formula (1) is less than 3g, it shall be calculated as 3g. 3.12 Water pressure test
All parts that bear water pressure, such as the pump body and pump cover, shall be subjected to water pressure test. No leakage shall occur during the test under the specified test conditions.
3.13 Vibration and noise
The noise of the pump when working within the specified working range shall comply with the provisions of Class C in GB10890. 3.13.2 The vibration intensity of the pump when working within the specified working range shall comply with the provisions of Class C in GB10889. 3.13.3 Under the conditions specified in Articles 3.11.1 to 3.11.3, vibration and noise measurements may not be performed. 3.14 Assembly and surface treatment
3.14.1 All parts of the pump must be inspected and qualified before assembly. 3.14.2 Before assembly, iron filings, sand accumulation and lumps in the impeller, pump flow channel and bearing body must be removed. Non-machined surfaces in contact with water should be coated with anti-rust primer, machined surfaces in contact with water should be coated with anti-rust grease, and non-machined surfaces in the bearing body should be coated with resistant paint. 5
JB/T6667.2-1993
3.14.3 The end face (or radial) circular runout of the assembled rotor components shall not exceed the provisions of Table 4Table 4
>50~120
>120~260
>260~500
>500~800
100000
Speed nr/min
Impeller inlet seal end face (or radial seal outer cylindrical surface)0.08
JB/T6667.2-1993
3.14.4 When the assembled pump is not filled with stuffing, the rotor should be smooth and flexible when turned by hand without sticking or rubbing. 3.14.5 Remove rust and oil stains from the outer surface of the pump. The non-processed surface should be painted with primer and topcoat. The painting should comply with the provisions of JB4297; the exposed processed surface should be coated with anti-rust grease.
3.14.6 After anti-rust treatment and surface painting, the pump inlet and outlet should be sealed. 3.14.7 After the pump test is qualified, the accumulated water in the pump should be removed and anti-rust treatment should be performed. 3.15 Reliability
3.15.1 When the pump is running within the specified working range. The average working time before the first failure should be no less than 1500h. 3.15.2 When conducting reliability tests, except for maintenance and maintenance according to the requirements of the manufacturer and replacement of wearing parts at the specified time, other parts are not allowed to be replaced.
4 Test methods
4.1 The chemical composition analysis and mechanical properties test of the material shall be carried out in accordance with the provisions of relevant standards such as GB977, GB9439 and GB699. 4.2 The performance of the pump, such as flow, head, efficiency and NPSH, shall be measured in accordance with the provisions of GB3216. 4.3 The noise of the pump shall be measured in accordance with the provisions of GB10890. 4.4 The vibration intensity of the pump shall be measured in accordance with the provisions of GB10889. 4.5 Water pressure test: Apply a test pressure of 1.5 times the working pressure to the parts that bear the water pressure, but the minimum pressure shall not be less than 0.2MPa, and the pressure duration shall not be less than 5min. Observe whether there is leakage during the test. 4.6 The static balance test shall be carried out in accordance with the provisions of GB9239. 4.7 The reliability test shall be carried out in accordance with the provisions of the relevant reliability test evaluation method standards. 4.8 For pumps with an outlet diameter greater than 500mm, if the manufacturer cannot conduct a factory performance test, a model test or a field test may be used, and the test method shall be agreed upon by the supply and demand parties. If a model test is used, the impeller diameter of the model pump shall not be less than 300mm5 Inspection rules
Inspection is divided into factory inspection and type inspection.
5.1 Factory inspection
Mass-produced pumps shall pass factory inspection and be accompanied by product certificates and instructions before leaving the factory. 5.1.1
Inspection items:
Inspect appearance and paint quality;
Inspect assembly quality;
Static balance test;
Water pressure test;
Measure the flow rate, head, shaft power and efficiency of the specified performance points of the pump; e.
f. Operation test: The pump is operated at the specified speed and working range operating point. The operation duration shall be in accordance with the provisions of GB3216. Check whether the operation is stable, whether there is abnormal vibration and noise during operation, and check the bearing temperature rise and shaft seal leakage. 5.1.3 Sampling inspection and judgment and disposal rules shall comply with the provisions of GB2828. A normal inspection sampling plan can be adopted, the inspection batch is the monthly (or daily) output of the product or the order batch (units), the inspection level is the general inspection level II, and the qualified quality level (AQL) is 4.0; it can also be determined by negotiation between the supply and demand parties.
5.2 Type inspection
JB/T6667.21993
Type inspection should be carried out in any of the following situations: when the new product or old product is transferred to the factory for trial production and identification; a.
After formal production, if there are major changes in structure, materials, and processes, which may affect product performance: c.
When the product is resumed after a long period of suspension; when the batch-produced products are periodically inspected (at least once a year); d.
When the factory inspection results are significantly different from the last type inspection; e.
When the national quality supervision agency proposes a type inspection requirement. The inspection items are all technical requirements specified in this standard. 5.2.3 The sampling inspection and judgment and disposal rules for type inspection shall comply with the provisions of GB2828. It is recommended to adopt a normal inspection sampling plan. The inspection batch should meet the sample size of at least 2 units, the inspection level is the special inspection level S-1, and the qualified quality level (AQL) is 6.56 Marking, packaging, transportation and storage
6.1 Marking
6.1.1 Sign
Each pump should be equipped with a sign in a conspicuous position. The size and technical requirements of the sign should comply with the provisions of GB/T13306. The content of the sign should include:
Manufacturer name and trademark;
Pump name and model;
Main technical parameters specified for the pump: flow rate (m/h), head (m), speed (r/min), rated (standard) power of the matching power machine (kW), critical cavitation margin (m), pump weight (kg); d.
Factory date and factory number.
Direction of rotation
The direction of rotation of the pump shaft should be marked with a red arrow in an obvious position. Packaging and transportation
The packaging of the pump should comply with the provisions of GB/T13384. Special packaging can be determined by negotiation between the supply and demand parties. Each pump should have the following random accessories and documents when it leaves the factory. The documents should be sealed in a waterproof bag: product certificate and installation product instruction manual; b.
Packing list;
c. Other technical information related to use. 6.2.3
Damage.
Measures should be taken to ensure that the bearings and mechanical seals of the pump and other parts will not be damaged by vibration and collision during transportation and loading and unloading. 6.3 Storage
Measures should be taken to prevent rust and damage during storage. The oil seal of the pump is valid for 12 months and should be inspected or replaced when it expires. 7 Scope of complete set and warranty matters
7.1 Scope of complete set
Users can order all or part of the complete set supply scope of the following products according to their needs and specify it in the order form: Completely assembled pump;
Matching power machine;
JB/T6667.2-1993
Accessories: inlet and outlet elbows, bottom valves, couplings or pulleys, protective devices (covers), etc.; c.
Anchor bolts;
Necessary wearing parts (mechanical seals, skeleton rubber oil seals, shaft sleeves, etc.); special tools for assembly and disassembly.
Warranty matters
Under the conditions that the user complies with the provisions of the transportation, storage, installation and operating instructions of the pump, within 18 months from the date of shipment from the manufacturer, the cumulative operation shall not exceed 12 months. If the product is damaged or cannot work normally due to poor manufacturing, the manufacturer shall replace or repair it for the user free of charge, but this does not apply to the damage of wearing parts. If the two parties have a dispute over product quality, they should submit it to the relevant quality supervision department for arbitration.
Additional Notes:
This standard is proposed and managed by the China Agricultural Mechanization Science Research Institute of the Ministry of Machinery Industry. This standard is drafted by the China Agricultural Mechanization Science Research Institute and the Zhejiang Provincial Electromechanical Design Institute. The main drafters of this standard are Zhang Mingguang and Xu Guangyuan. From the date of implementation of this standard, NJ316-84 "Technical Conditions for Volute Mixed Flow Pumps" will be invalid.
People's Republic of China
Mechanical Industry Standard
Technical Conditions for Volute Mixed Flow Pumps
JB/T 6667.21993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Word Count 18.000
1/16 Print Sheet 3/4
Format 880×1230
First Edition in December 1993
First Printing in December 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_999 /
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