This standard specifies the acceptance technical requirements, inspection items, inspection rules, etc. for open blades of mixed flow pumps and axial flow pumps. This standard is applicable to the acceptance of fully adjustable and semi-adjustable blades, and also to the acceptance of blades of impellers with welded blades and impeller hubs, but not to the acceptance of blades of integrally cast impellers. JB/T 5413-1991 Technical conditions for acceptance of open blades of mixed flow pumps and axial flow pumps JB/T5413-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T541391
Mixed Flow Pump, Axial Flow Pump Open Blade
Technical Conditions for Acceptance
Published on 1991-07-22
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Implemented on 1992-07-01
Mechanical Industry Standard of the People's Republic of China
Mixed Flow Pump, Axial Flow Pump Open Blade
Technical Conditions for Acceptance
Subject Content and Scope of Application
JB/T5413-91
This standard specifies the technical requirements, inspection items, inspection rules, etc. for the acceptance of mixed flow pump and axial flow pump open blades (hereinafter referred to as blades). This standard applies to the acceptance of fully adjustable and semi-adjustable blades, and also to the blade acceptance of impellers with welded blades and impeller hubs, but not to the blade acceptance of integrally cast impellers. Cited standards
GB1176wwW.bzxz.Net
GB2100
GB2828
GB3077
GB5676
GB7021
GB9439
GB/T13008
JB2759
3 Terms, symbols, codes
3.1 Blade chord length
Technical conditions for cast copper alloys
Technical conditions for stainless acid-resistant steel castings| |tt||Batch inspection counting sampling procedure and sampling table Technical conditions for alloy structural steel
Casting carbon steel parts for general engineering
Surface roughness comparison sample casting surface
Terms of centrifugal pumps
Gray cast iron parts
Technical conditions for mixed flow pumps and axial flow pumps
General technical conditions
Packaging of electromechanical products
The length of the straight line connecting the leading and trailing edge points of the airfoil in the blade section is called the blade chord length (also called chord length), represented by L, as shown in Figure 1. Working drawing
Fragrant edge point
Portuguese edge point
Approved by the Ministry of Machinery and Electronics Industry on July 22, 1991 Blade section
Figure 1 Blade chord length, thickness, installation height
Implementation on July 1, 1992
3.2 Blade thickness
JB/T5413-91
In the blade section, the length of each line segment perpendicular to the chord and between the working surface and the back surface is called the blade thickness, which is represented by. The length of each line segment between the upper and lower surfaces of the blade airfoil in the weaving coordinate direction is represented by, see Figure 1. 3.3 Blade installation height
When the blade is at an installation angle of 0°, the distance between the leading and trailing edge points of the airfoil at each section at radius d, 42..… relative to the rotation center of the airfoil in the ordinate direction is represented by R. RI, R2, R, and R4 in Figure 1 are the installation heights of the inner and outer circles of the blade. 3.4 Blade surface waviness
Use a flexible straight edge ruler to check the blade working surface, measure the arc length C and depth D of each gap, and the ratio of the gap depth to the gap arc length, that is, the D/C ratio, is the surface waviness. It is represented by P, see Figure 2.c
Figure 2 Blade surface waviness
3.5 Other terms, symbols and codes shall comply with the provisions of GB7021 and GB/T13008. 4 Technical requirements
Flexible straight edge ruler
Blade working surface
The acceptance of blades shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.1 Blade accuracy classification
The classification of blade manufacturing accuracy shall be as specified in Table 1. Table 1
Blade classification
Classification requirements
1. Pumps used in key projects require small perturbations, low noise, stable operation, etc., and have strict requirements on performance indicators, cavitation performance, and cost 2. Model pumps
Pumps used in important projects have stricter requirements on operation conditions and performance indicators. The impeller diameter is not less than 1000mm. General-purpose pumps that do not belong to Class A or Class B. Note: ① Pumps that implement Class A and Class B should be explained in the order contract and data sheet. ③ Pumps that implement Class C are general orders.
4.2 Materials
4.2.1 According to the use of the product, the performance indicators of the selected blade material should not be lower than those specified in Table 2. Manufacturing accuracy
General manufacturing accuracy
4.2.2 The blade material must have a certificate of conformity or factory inspection data to prove that it meets the requirements of relevant standards. If required by the user, the chemical composition and mechanical properties test report of the material should be provided. 2
Material name
Gray cast iron
Stainless steel
Alloy cast steel
Front cast aluminum bronze
Cast silicon copper
JB/T5413—91
.ZG35Mn, ZG270-500, ZG230-450ZG1Cr18Ni9Ti, ZG1Cr18Ni9
ZG20SIMn
ZCuAI9 Mn2
ZCuZn16Si4
Standard code
GB9439
OB5676
GB2100
GB3077
GB1176
GB1176
4.3 Castings
4.3.1 Blades are not allowed to have cracks, pores, shrinkage holes, looseness, slag holes, insufficient casting and other defects that affect mechanical properties. 4.3.2 Welding repair is allowed for defects that do not affect mechanical properties. The welding repair range and process should comply with the provisions of relevant standards. 4.3.3 The surface of the casting can be cleaned by sandblasting, shot blasting or other methods. All flash on the parting surface or the remnants of the pouring riser should be removed to make the surface of the casting smooth.
4.3.4 Blade castings should be annealed or aged. Inspection items
5.1 Check the flow surface of the blade
5.1.1 The roughness of all flow surfaces of the blade shall be compared with the samples specified in GB6060.1 and shall comply with the requirements of Table 3. Table 3
Blade classification
Cast steel, stainless steel
The allowable deviation of blade shape and geometric dimensions shall comply with the provisions of Table 4. The impeller outer diameter D is shown in Figure 3, and the blade cross-sectional shape is shown in Figure 4. 5.1.2
Parallel to water flow direction
Vertical to water flow direction
Current system impeller
Figure 3 Impeller outer diameter Dz
Current system impeller
Vertical to water flow direction
Parallel to water flow direction
Black wind
Inspection items
Blade cross-sectional shape≤\
Blade thickness (or $))
Blade installation height R
Impeller outer diameter D
Blade chord length L
Shaft speed Fragment type
Model pump
JB/T 541391
Special rack
Liwu type
Time blade working surface
Mixed rate fragmentor
Figure 1 Blade cross-sectional shape
Allowable deviation%
Note: 1) When checking the blade cross-sectional shape, each section has a sample (the number of sections is specified in the drawing). Sample frame
Ratio of blade working area
to the nominal outer diameter D of the impeller
Ratio of the maximum nominal thickness of each section
Ratio to the nominal size, only measure the inner and outer circles of the blade (see Figure 1)
Ratio to the nominal outer diameter D of the impeller:
Ratio to the nominal size
2) Thickness (or 5), check at least 5 points in each section, these 5 points should be measured at the dimensions given in the blade wooden model drawing and evenly distributed, including 1 point measured at the maximum thickness.
3) Ratio to the nominal thickness of the inspection point.
5.1.3 The waviness of the blade surface shall meet the following requirements (only applicable to Class A): When the gap arc length C is greater than or equal to 100mm, it shall be in accordance with the provisions of Table 5; b.
When the gap arc length c is less than 100mm, it shall be assessed according to the maximum gap depth D, which shall not exceed 1.0mm. Table 5
Impeller outer diameter D:
5.1.4 The water inlet edge of the blade shall meet the following requirements: The allowable waviness P of the blade surface
Parallel to the water flow direction
Vertical to the water flow direction
a Acceptance of Class A and Class B blades. At the section around the leading edge of the blade and extending 50mm to the working surface and back of the blade (see Figure 5), the maximum allowable clearance between the blade water inlet edge sample and the blade is 1.5mm, and the tolerance 02 between the remaining section of the blade water inlet edge sample and the blade is 3.3mm; b. Acceptance of Class C blades. The blade water inlet edge is ground and rounded, and no sample is required for inspection. 5.1.5 The working surface shape of the blade water outlet edge should be consistent with the drawing. Grinding from the back is allowed to reach the allowable thickness. The maximum allowable deviation of the water outlet edge thickness is ±10% of the design thickness.
Blade water inlet edge sample
5.2 Blade weight
JB/T5413—91
Figure 5 Shape of the water inlet edge of the blade
5.2.1 The allowable deviation of the weight of a single blade is 6% of the nominal weight of the blade. 5.2.2 The weight tolerance of each blade in each blade group shall be in accordance with the provisions of Table 6. Table 6
Blade classification
Impeller outer diameter D
Weight tolerance of each blade
Grade A, B
Working surface
Blade section
≥>1000
5.2.3 After weighing, the data should be recorded on the blade or on the corresponding record card for installation. 5.3 Blade flange and shaft neck
The blade flange and shaft neck parts shall be inspected by flaw detection according to the product technical conditions or drawing requirements. 5.4 Blade Angle Positioning Marks
The blades are mounted on the impeller hub, and the deviation of their positioning marks shall not exceed ±15'. Inspection tools
Inspection of blade surface waviness
The ratio of the difference in weight of each blade in each group of blades to the average weight of this group of blades
Use a 1000mm long flexible straight edge ruler. If space is limited, a 650mm or shorter flexible straight edge ruler can also be used. 6.2 Inspection of the water inlet edge of the blade
Make a template of the inlet shape of each section of the blade according to the drawing. Each section should have a template. The template is designed to fit a 50mm long section extending from the back of the blade around the blade head to the working surface of the blade. The remaining length of the template on the working surface will be hollowed out, and the gap is equal to the maximum space allowed to pass at the end of the template. The specific shape is in accordance with the provisions of Figure 6. 5
7 Inspection method
Blade water side sample
JB/T541391
,65D;/D,≥1600mm
5mm,D,1500mm
Figure 6 Blade water side sample
7.1 The chemical composition and mechanical properties of the materials shall be in accordance with the relevant standards in Table 2. 7.2 Inspection method for the waviness of the blade flow surface Use a flexure straight edge ruler along the blade surface to check the entire flow surface of the blade in both the parallel and perpendicular directions of the water flow. The edge of the straight edge ruler should fit the smooth curve of the blade surface. The straight ruler should reselect the checked area. The reselection length of a 1000mm long straight ruler should not be less than 150mm; the reselection length of a 650mm or shorter straight edge ruler should not be less than 10% of the straight ruler used. 7.3 The inspection method for the water inlet of the blades shall comply with the provisions of Articles 5.1.4 and 6.2. 8 Inspection rules
The inspection quantity and inspection rules shall comply with the provisions of GB2828. The sampling method may adopt single or double sampling, adopt inspection level II, and the qualified quality level AQL is 4.
9 Packaging, purchase and storage
9.1 Packaging
9.1.1 The packaging of blades shall comply with the provisions of JB2759. 9.1.2 Measures shall be taken to avoid damage caused by vibration and collision during transportation. 9.2 Purchase and storage
The blades shall be prevented from rusting and damage during storage, and regular inspections shall be carried out. Additional instructions:
This standard was proposed and managed by the Shenyang Pump Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shanghai Pump Factory. The main drafter of this standard is Hu Jianchun.
People's Republic of China
Mechanical Industry Standard
Mixed Flow Pump, Axial Flow Pump Open Blade
Technical Conditions for Acceptance
JB/T 541391
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (P.O. Box 8144, Beijing 100081)
Copyright reserved. No reproduction allowed
Printed by Qinghe County Printing Factory, Hebei Province
Format 880×1230
1/16 Printing Sheet 5/8 Word Count 12000
First Printing in October 1991
First Edition in October 1991
Print Count 00.0011000
Price 1.00 Yuan
No. 0288
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