JB/T 6666.2-1993 Technical requirements for guide vane mixed flow pumps
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6666.2-1993
Guide vane 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
Guide vane mixed flow pump
Subject content and scope of application
Technical conditions
JB/T 6666.21993
This standard specifies the technical requirements, test methods, inspection rules and markings, packaging, etc. of guide vane mixed flow pumps. This standard applies to guide vane mixed flow pumps (hereinafter referred to as pumps) with a flow rate of 45~12000m/h, a head of 3~24m, and a conveying temperature of no more than 50℃ for clean water or water quality that meets the requirements of GB5084. Reference standards
GB 699
GB 977
GB1184
GB1348
GB1689
GB/T1804
GB2828
GB3216
GB3512
GB4216
GB5084
GB5676
GB9239
GB9439
GB10889
G B10890
GB/T13306
GB/T13384
JB4297
JB/T6666.1
3 Technical requirements
General requirements
General technical requirements
Rolling bearings
General requirements for physical tests of vulcanized rubber
Determination of tensile properties of vulcanized rubber
Rubber Shore A hardness test method
High-quality carbon Specifications for plain structural steel
Methods for testing mechanical properties of grey cast iron
Tolerances on shape and position Provisions for tolerances not specified Ductile iron castings
Determination of wear resistance of vulcanized rubber (using Akron abrasion machine) General tolerances Unspecified tolerances for linear dimensions
Batch-by-batch inspection Sampling procedures and sampling tables by count (applicable to inspection of continuous batches) Test methods for centrifugal pumps, mixed flow pumps, axial flow pumps and vortex pumps Test methods for rubber hot air aging
Dimensions of grey casting pipe flanges
Agricultural Water quality standard for irrigation field
Casting carbon steel for general engineering
Determination of allowable imbalance of rigid rotor balance qualityGray cast iron parts
Measurement and evaluation method of pump vibration
Measurement and evaluation method of pump noise
General technical conditions for packaging of electromechanical products
Technical conditions for painting of pump products
Types and basic parameters of guide vane mixed flow pump
The pump shall meet the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. Approved by the Ministry of Machinery Industry on June 4, 1993
Implementation on January 1, 1994
JB/T6666.21993
The maximum working pressure of the pump shall not be greater than the nominal pressure of the pump inlet and outlet flanges. The manufacturer shall provide the performance curve of each pump (the relationship curve between head, efficiency, shaft power, NPSH and flow rate), and the performance curve of each blade installation angle shall be provided for the adjustable impeller. The recommended use range of the pump is 0.75Qsp～1.2Qsp (Qsp is the flow rate at the specified point).
1 The power reserve factor of the power machine supporting the pump is generally 1.1～1.3.3.1.4
5 For vertical pumps, the minimum submergence depth of the upper edge of the pump blade outlet shall be given, and the size of the water inlet 3. 1. 5
flow channel shall be provided for pumps with an outlet diameter of more than 900mm.
The first critical speed of the horizontal pump shall be at least 10% higher than the maximum allowable continuous operating speed. The first critical speed of the vertical pump with an outlet diameter greater than 350mm shall meet the requirements of formula (1): ns nel
Where: n
The maximum allowable continuous speed of the pump, r/min; the first critical speed of the pump, r/min.
The basic parameters of the pump's specified performance points shall comply with the provisions of JB/T6666.1. The deviation of the pump's basic parameters shall comply with the provisions of Class C in GB3216. 3.3 Structure
The pump's structural type shall comply with the provisions of JB/T6666.1. 3.3.1
The pump's inlet and outlet connection flanges shall comply with the provisions of GB4216. The impeller is of closed, semi-open or open type, and its blades can be designed as fixed, semi-adjustable or fully adjustable. (1)
For semi-adjustable or fully adjustable blades, the pitch deviation of the installation holes between the blades of the impeller seat shall not exceed ±0.4% of the basic pitch size.
The installation angle deviation of the zero-degree line of the blade on the impeller seat shall not exceed ±15', and the accuracy of the radial runout tolerance of the blade outer circle to the rotor axis shall comply with Class 9 specified in GB1184.
For semi-open or open impellers, the gap between the outer circle of the blade and the impeller shell should be uniform, and the actual gap in the diameter direction should be selected according to Table 1; for closed impellers, the gap in the diameter direction of the sealing ring should be selected according to Table 2. Table 1
>80~220
>220~380
>380~550
>550~880
>880~1320
Impeller diameter
≥70~180
>180~315
>315~450
>450~720
>720~1080
Clearance between blade outer circle and impeller housing in diameter direction 0.40.8
Clearance in sealing ring diameter direction
The pump impeller should be securely fixed on the shaft and should not move in the circumferential and axial directions relative to the shaft. mm
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. The shaft sleeve and the guide bearing are generally chrome-plated, and the base plating thickness is 0.05~0.12mm or a stainless steel sleeve is used. 3.4
JB/T 6666.21993
The shaft seal of the pump is generally sealed with soft packing, and there should be enough space outside the stuffing box to facilitate the replacement of the packing. When using soft packing seal, there should be a shaft sleeve on the shaft, and there should be no scratches, rust spots and other defects on the surface of the shaft sleeve. 3.4.2
3.5 Bearings and lubrication
The bearings of the pump transmission mechanism should use rolling bearings that comply with GB307.3. 3.5.2
The operating temperature of the bearing shall not exceed the ambient temperature of 40℃, and the maximum operating temperature shall not exceed 75℃. The bearings are lubricated with grease, and the grease should be replaced regularly. Pump guide bearings should generally use rubber bearings, and their physical properties should not be lower than those specified in Table 3. Table 3
Tensile strength
Elongation at break
Permanent deformation at break
Shore A hardness
Abrasion loss
>11.77MPa
When tested on an abrasion testing machine<0.2cm2/1.61kmThe temperature is 70℃. Within 72h, the aging coefficient>0.8The specific pressure of the rubber bearing is ≤0.5MPa
The diameter clearance of the rubber bearing is calculated according to formula (2) at room temperature: S= 0.2+
Where: S-
Bearing diameter clearance, mm;
The diameter of the shaft or sleeve at the fitting with the guide bearing, mm. 2d
Inspection standard
GB1689
GB3512
Pump guide bearings can also be made of metal or plastic materials, and their technical requirements should comply with relevant standards. 3.5.7 The bearing body of the pump should be provided with a hole for injecting lubricant into the guide bearing. 3.6 Coupling
Pumps usually use elastic couplings, and rigid couplings are used for vertical pumps that bear thrust from the prime mover. 3.6.1
The coupling should be equipped with a protective cover.
The coupling should be able to transmit the maximum torque of the prime mover, its allowable speed should match the speed of the prime mover, and the installation accuracy should comply with the provisions of relevant standards.
3.7 Materials and purchased parts
Materials used in pumps must be accompanied by a factory certificate or quality assurance certificate before use. Pump impellers, guide vanes, blades, impeller housings, impeller seats, etc. should be made of materials with performance not lower than that specified in Table 4. Table 4
Part name
Impeller, guide vane, impeller casing
Impeller seat
Impeller diameter<900mm
Impeller diameter≥900mm
QT4210
ZG230-450, ZG270-500
ZG230450, ZG270500
Standard code
GB9439
GB1348
GB5676
GB9439
GB5676
The pump shaft should be made of materials with performance not lower than that of 45 steel specified in GB699, and should be quenched and tempered. For long shafts with a shaft diameter less than 3
JB/T6666.2-1993
30mm and a shaft length greater than 2m, it is allowed to use 35 cold-drawn round steel with performance not lower than that specified in GB699. 3.7.4 Purchased parts must have a certificate of conformity or a valid quality assurance certificate. 3.8 Casting quality and dimensional deviation
The technical requirements for castings shall comply with the provisions of GB9439, GB1348 and GB5676. 3.8.1
3.8.2 The casting dimensional tolerance shall comply with the provisions of Figure 1 and Table 5. 3.8.3 The flow passages of the impeller and guide vanes shall be finished and smooth, and their geometric shape and size shall be checked. The inspection location is shown in Figure 1, and the allowable deviation shall comply with the provisions of Table 5.
Enclosed impeller
Semi-adjustable or fully-adjustable blades
3.8.4 For semi-adjustable and fully-adjustable impellers, the weight difference between the blades in each set of pump blades is 2% of the nominal weight of a single blade; the allowable deviation of the weight of a single blade is 6% of the nominal weight. 3.8.5 The casting surface should be cleaned by sandblasting, shot blasting or other methods. Zero
Fixed semi-open or
Closed impeller
Semi-adjustable or
Fully adjustable
D, D,
Inlet diameter
Outlet width
Blade thickness
Blade inlet and outlet pitch
Blade pitch
Installation height
hy, h,
Guide vane inlet pitch
Guide vane inlet opening
Tolerance and fit, surface roughness
JB/T6666.2-1993
>80~350
>350~700
The tolerance and fit accuracy, surface roughness parameter R of the main parts of the pump shall not be lower than the requirements of Table 6. Table 6
Matching parts
Impeller and shaft
Sleeve and shaft
Flag pipe and runner chamber
Runner chamber and guide vane body
Guide vane body and elbow
Coupling and shaft
Tolerance
>700～1200
Surface roughness
General m grade (medium grade).
The limit deviation of the machining dimensions without tolerance shall comply with the provisions of GB/T1804. 3.9.2
Surface shape and position tolerance
JB/T 6666.2—1993
The surface shape and position tolerance of the mating surfaces of the main parts such as impellers, bell pipes, runner chambers, guide vanes, elbows, shafts, sleeves, couplings, bearing seats, etc. shall not be lower than Grade 8 specified in GB1184. 3.11 Static balance
All rotating parts such as impellers and couplings shall be statically balanced. The balance quality level shall not be lower than the requirements of Grade G6.3 in Figure 2. 3.11.1
The balancing weight on the maximum outer diameter of the balancing piece shall not exceed the calculated value of formula (3): 2eW
Wherein: e allowable eccentricity, um;bzxz.net
balancing weight at the maximum outer diameter, each;
100000
speed nr/min
wbalancing weight, kg;
Dmaximum outer diameter of the balancing piece, mm.
JB/T6666.21993
3.11.2Excess metal may be cut off according to the drawing to obtain balance. The thickness cut off on the impeller cover shall not exceed one third of the original thickness.
3.11.3When the balancing weight at the maximum outer diameter of the balancing piece obtained by formula (3) is less than 3g, it shall be calculated as 3g. 3.12
2 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
All parts of the pump must be inspected and qualified before assembly. Before assembly, iron filings, sand accumulation, lumps, etc. in the impeller, guide vane flow channel, bearing body and elbow must be removed. When the pump with an outlet diameter greater than 500mm cannot be shipped as a whole, the relevant parts and components shall be pre-installed in the factory and marked. 3.14.3
The radial runout value of the assembled rotor components shall not exceed the provisions of Table 7. Table 7
Nominal diameter
>70~200
>200~350
>350~500
>500~800
>800~1320
Blade outer surface
Impeller inlet seal outer surface
Shaft sleeve outer surface
5When the packing of the assembled pump is not tightened, the rotor should be turned smoothly and flexibly by hand without sticking or rubbing. 3.14.5
3.15 Painting and rust prevention
3.15.1 Remove rust and oil stains from all surfaces of the pump. The non-machined surfaces of the inner surface of the pump that come into contact with water should be coated with anti-rust primer, and the machined surfaces that come into contact with water should be coated with anti-rust grease; the non-machined surfaces of the outer surface of the pump should be coated with primer and topcoat, and the painting should comply with the provisions of JB4297. The exposed machined surfaces should be coated with hardened anti-rust grease. 3.15.2 After anti-rust treatment and surface painting, the pump inlet and outlet should generally be sealed. 3.15.3 After the pump test is qualified, the accumulated water in the pump should be removed and anti-rust treatment should be performed. 3.16 Reliability
3.16.1 When the pump is operating within the specified working range, the average working time before the first failure should be no less than 1500h. 3.16.2 During the reliability test, except for maintenance and servicing according to the requirements of the manufacturer and replacement of wearing parts at the specified time, it is not allowed to replace other parts.
4 Test method
JB/T 6666.21993
4.1 The chemical composition analysis and mechanical property test of materials shall be carried out in accordance with the provisions of relevant standards such as GB977, GB9439, GB699, GB1348 and GB5676.
4.2 The flow rate, head, efficiency and cavitation margin of the pump 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 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 factory performance tests, model tests or on-site tests may be used. The test methods 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 300mm. 5 Inspection rules
Inspection is divided into factory inspection and type inspection.
5.1 Factory inspection
Pumps produced in batches shall pass the factory inspection and be accompanied by a product certificate and instruction manual before they can leave the factory. 5.1.1
Inspection items:
Inspect appearance and paint quality;
Inspect assembly quality;
Static balance test;
Hydraulic pressure test;
Inspect whether there is a protective cover (when the matching power machine leaves the factory); e.
Measure the flow rate, head, shaft power and efficiency of the specified performance point of the pump: 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) at one time. 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
5.2.1 Type inspection shall 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.
b. After formal production, when there are major changes in structure, materials, and processes that may affect product performance; when resuming production after a long period of suspension; c.
When periodic inspections are conducted for mass-produced products (at least once a year); d.
When the results of the export inspection are significantly different from those of the last type inspection: 8
JB/T 6666.21993
fWhen the national quality supervision agency proposes a type inspection requirement. 5.2.2 The inspection items are all the 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 6.5.6 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;
b. Pump name and model;
Main parameters specified for the pump: flow (m/h), head (m), speed (r/min), rated power of the matching power machine (kW), critical steam c.
Pressure 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 a conspicuous position. Packaging and transportation
The packaging of the pump shall comply with the provisions of GB/T13384. Special packaging can be determined by negotiation between the supply and demand parties. Each pump shall be accompanied by the following accessories and documents when it leaves the factory. The documents shall be sealed in a waterproof bag: product certificate and product instruction manual; a.
b. Packing list;
Other technical information related to use.
Measures shall be taken to ensure that the pump will not be damaged or lost due to vibration and collision during transportation and loading and unloading. 6.3 Storage
Measures shall be taken to prevent rust and damage during storage. The oil seal of the pump is valid for 12 months and shall be inspected or replaced when it expires. 7
Scope of complete set and warranty
Scope of complete set
Users can order all or part of the following complete set supply scope of products according to their needs and specify it in the order form: fully assembled pump or all pre-assembled parts; a.
Matching motor;
Transmission device;
Accessories: water outlet flap door, coupling, protective cover, etc.; d.
Base and anchor bolts;
Necessary wearing parts (oil-impregnated asbestos packing, bushing, guide bearing, etc.); special tools for assembly and disassembly.
Guarantee
JB/T6666.21993
If the user complies with the provisions of the pump's transportation, storage, installation and operating instructions, 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 properly due to poor manufacturing, the manufacturer shall replace or repair it for the user free of charge, but this does not apply to damaged wearing parts. If the two parties have a dispute over product quality, it shall be submitted to the relevant quality supervision department for arbitration.
Additional Notes:
This standard was proposed and coordinated by the China Agricultural Mechanization Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by the China Agricultural Mechanization Science Research Institute and the Hubei Electromechanical Research Institute. The main drafters of this standard are Li Yunhu and Jin Jiying. 10
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