JB/T 443-1992 Technical conditions for long axis centrifugal deep well pump
Some standard content:
J71 | | tt | | JB | Released on 25th
Technical Parts
1993-07-01 Implementation
Released by the Ministry of Mechanical and Electronics Industry of the People's Republic of China
Machinery Industry Standards of the People's Republic of China
Long Shaft centrifugal deep well pump
1 Subject content and scope of application
Technical conditions
JB/T 443--92
Replaces JB443-85
This standard Specifies the technical requirements, test methods and acceptance rules for long-axis centrifugal deep well pumps (hereinafter referred to as "pumps"). This standard applies to pumps that extract water from water merges. 2 Reference standards
GB197
GB527
GB 528
GB531
GB 699
GB 700
GB 905| |tt||GB 985
GB 1176
GB1220
GB1348
GB 1689
GB2828
GB 3077
GB3078
GB3216
GB3512
GB4216.3
GB 4216.4
GB 4216.5
GB 6060.1
GB7021|| tt||GB9439
GB9440
GB 10889
GB 10890
GB/T 13306
GB/T 13384
JB/T3564
JB/T3565
General thread tolerances and fits
General requirements for vulcanized rubber physical test methods Determination of vulcanized rubber tensile properties
Rubber Shore A hardness test method| |tt||Technical conditions of high-quality carbon structural steel
Carbon structural steel
Cold drawn round steel size, shape, weight and allowable deviations gas welding, manual arc welding and gas shielded welding seam groove Basic types and sizes of cast copper alloy technical conditions
Stainless steel rods
Ductile iron castings
Determination of wear resistance of vulcanized rubber
Batch-by-batch inspection and counting sampling procedures and sampling tables (Applicable to continuous batch inspection) Taijin structural steel technical conditions
High-quality structural steel cold-drawn steel technical conditions
Test methods for centrifugal pumps, mixed flow pumps, axial flow pumps and vortex pumps Hot air aging of rubber Test method
6bar gray cast iron pipe flange size
10bar gray cast iron pipe flange size
16bar gray cast iron pipe flange size
Surface roughness comparison sample casting Surface
Centrifugal pump terminology
Gray iron castings
Male iron castings
Pump vibration measurement and evaluation method
Pump noise measurement and evaluation method| | tt | Approved for the implementation of 19930701
1
JB/T4297
3 terms
Pump product coating technical conditions
JB/T 443-92||tt| |Common terminology in this standard shall be in accordance with the provisions of GB7021, and special terms shall be in accordance with the provisions of this standard. 3.1 Long-axis centrifugal deep well pump
A vertical pump composed of single or multiple centrifugal impellers, guide housings (or guide vanes), water pipes, pump bases and other components. The pump base and prime mover are located at the upper part of the wellhead. The power of the prime mover is transmitted to the impeller shaft through a transmission shaft concentric with the water pipe. The parts, components and parts of the pump are defined as follows: a. Working parts
Parts composed of impeller, guide housing (or guide vane) and impeller shaft. It is installed at the lower part of the water pipe and is the part where the water pump does its work. b. Water inlet parts
are composed of water inlet filter, suction pipe and bottom valve. Installed at the lower end of the working part. c. The water-raising pipe part
is composed of multiple water-raising pipes, transmission shafts, bearing bodies and other parts. It is installed between the pump base and the working parts, and plays the role of suspending the working parts. At the same time, it is a channel for the water pumped by the working parts to be directed to the ground. d, and the upper part
is composed of the pump base, transmission prime mover and other components. It is installed on the upper part of the wellhead. e. Prime mover
is a moving side machine that drives the pump to perform work. There are special vertical hollow shaft motors for deep well pumps, ordinary horizontal or vertical motors, internal combustion engines, etc. f. Transmission device
The intermediate device that transmits the power of the prime mover to the transmission shaft. There are pulley transmission devices, gear box transmission devices, thrust devices required for ordinary vertical motors, etc.
g． The shaft of the transmission device
is a shaft that passes vertically through the pump base component and the center of the transmission device. Its upper end is equipped with an adjustment nut for adjusting the axial clearance of the impeller. h. The transmission shaft
is installed inside the water pipe and transmits the power of the prime mover to the impeller shaft. i. Impeller shaft
The shaft that fixes the impeller in the working part.
3.2 Base surface
The plane in contact between the pump base and the foundation.
3.3 Pump installation depth
The distance from the base surface to the lower end of the water inlet component. is the total length of the downhole part of the pump. 3.4Static water level
The distance from the base surface to the free water surface in the well before the pump works. 3.5 Dynamic water level
The distance from the base surface to the water surface in the well when the pump is working normally. 3.6 Water level drop
The difference between the static water level and the dynamic water level,
3.7 Allowable working range
The flow range that allows the pump to operate normally. Usually it is the range from the large flow point to the small flow point given on the pump performance curve. This range is determined by the manufacturer.
3.8 axial water thrust
When the pump is started or working normally, a pressure difference and dynamic reaction force are generated before and after the impeller. The resultant of these forces is called axial water thrust. This force is generally directed toward the impeller suction port, but sometimes the opposite is true. 2
3.9 Pipeline loss
JB/T 443-92
The hydraulic loss caused when water flows in the pipeline, expressed in ^H, the unit is m. The pipeline loss of the water pumping pipe can be determined by referring to Appendix A (Supplement).
3.10 Drive shaft power loss
The power lost to overcome the friction of the drive shaft in the bearing and water can be determined by referring to Appendix B (Supplement) under normal circumstances. 3.11 Working pressure
The water pressure endured by parts (parts) when the pump is operating normally. 4 Technical requirements
The pump should comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. If the user has different requirements for the product than this standard, the water quality pumped by the pump should meet the following requirements: the temperature does not exceed 40 ℃
b.
c.
d.
e.
Solid content (by mass) is not greater than 0.01%: pH value 6.5~~8.5#
The hydrogen sulfide content is not greater than 1.5mg/L;
does not contain any oil.
4.2 Performance
The performance parameters and dimensions of the pump should be Comply with the regulations of JB/T3564. 4.2.1
4.2.2
The efficiency of the pump should not be lower than the regulations of JB/T3565. The manufacturer should determine the allowable working range of the pump and give the lift and lift. The relationship curve between efficiency, shaft power and flow. 4.2.31
The manufacturer should give the pump power, and the power margin is based on the type of prime mover, the structure of the transmission device, the installation depth of the pump, and the medium. 4.2 .4
Comprehensive consideration of mass density, environmental conditions, etc. The ratio of the equipment power to the maximum shaft power of the pump within the allowable working range should not be less than 1.15 times. 4.2.5 The vibration of the pump should comply with the provisions of GB10889 4.2. 6. The noise of the pump should comply with the regulations of GB10890. 4.3 Structural design
4.3.1 Suction pipe and water filter
The diameter of the suction pipe should be the same as that of the water pipe, and the water inlet of the water filter should be clean. The area should be at least three times the cross-sectional area of ??the suction pipe, and its maximum hole diameter should not be larger than 75% of the minimum flow passage size of the impeller or guide shell. 4.3.2 Working parts
4.3.2.1 The impeller should be 1:30. The taper sleeve or a flat key and a stop sleeve (or snap ring) are fastened to the impeller shaft 4.3.2.2. The inclination of the incline of the guide shell matching the semi-open impeller must be consistent with the inclination of the impeller, and its contact area should not be less than 50% of the mating area.
4.3.2.3 A replaceable sealing ring should be provided at the matching point between the mouth ring of the closed impeller and the guide shell. For pumps with a minimum diameter of 250 mm or more, ribs should be installed on the outside of the diversion housing sealing ring to protect the stop from being washed away. 4.3.2.4 The diameter clearance between the impeller and the sealing ring should comply with the requirements in Table 1. Table 1
Inner diameter of sealing ring
between
75
0. 25
>75
140
0.30
>140
200
0.35
>200
260
0. 4
>260||tt ||～340
0.45
mm
>340
0.5
The guide shells should be centered with seams and studs or threads connect. When connecting with studs, the joint surface should be like a gasket. 4.3. 2.5
3
JB/T 443-92
4.3.2.6 The effective length of the bearings in the upper and lower guide shells and bearing bodies should not be less than the shaft diameter. 1.5 times. 4.3.3 Water lifting pipe
4.3.3.1 Water lifting pipe can be connected with thread or flange. Threaded water risers are not allowed to have undercut grooves at the root of the thread. The width of the end sealing surface of flange-connected water risers is not less than 3mm. 4.3.3.2 The length of a single water pipe should be no more than 3m, and each pipe should be interchangeable. 4.3.4 Drive shaft
4.3.4.1 The diameter of the drive shaft should be calculated according to the third strength theory according to the belt power and the axial force it bears. The maximum stress should not exceed the service point (α) of the steel. 30% of the tensile strength (), or 18% of the tensile strength (), the diameter of the drive shaft should comply with the requirements of Table 2. Table 2
Drive shaft diameter
20
24
28
136
32
42||tt| |45
50
60
Each model of pump can use 2 or more diameter drive shafts according to the number of pump stages. 4.3.4.2
70
4.3.4.3 The mating part of the transmission shaft and the rubber bearing should be hard chromium plated or sleeved to improve the wear resistance of the mating surface. mm
80
4.3.4.4 The threads at both ends of the transmission shaft should be left-hand fine threads. The central parts of both end faces should be lower than the contact surface, and the area of ??the lower part should not be greater than 40% of the total area of ??the end faces.
4.3.5 Pump base components
4.3.5.1 The size of the pump base outlet flange should comply with the regulations of GB4216.3~4216.5. 4.3.5.2 The pump base components should be equipped with a stuffing box or stuffing box and stuffing sheath, water filling pipe and screw holes for the cooling water pipe joint for the transmission device.
4.3.6 Transmission device
When the pump is directly driven by a special vertical hollow shaft motor, no additional transmission device is required. 4.3.6.1 Various transmission devices should be equipped with rolling bearings or sliding bearings that can bear the axial force of the pump. The axial force includes: the maximum weight of all rotating parts and the water thrust when the pump is operating at the highest allowed lift. 4.3.6.2 The transmission device should have a mechanism to reliably prevent reverse rotation and measures to prevent dust and rainwater from entering the bearing chamber. 4.3.6.3 The pulley transmission device can be driven by flat belt or triangle belt. Its maximum transmission power is: when the pump speed is 2940r/min, it is not more than 18.5kW; when the pump speed is 1460r/min, it is not more than 55kw. 4.3.6.4 The gearbox transmission device adopts a pair of orthogonal bevel gear transmission and is connected to the horizontal prime mover through a universal coupling. 4.3.6.5 The matching place between the transmission shaft (including the motor drive shaft equipped with a special vertical hollow shaft motor) and the stuffing box of the pump base component should be hard chromium plated or bushed to improve the grinding ability of the mating surface. 4.3.6.6 The transmission device should be fully lubricated and cooled. When thin oil is used for lubrication, the oil temperature during operation should not be higher than 75°C. 4.4 Materials
4.4.1 The materials selected for main parts should not be lower than those specified in Table 3. Table 3
Part name
Impeller
Induction housing, pump base
Bearing body
Impeller shaft
4||tt| |Material grade
ZQSn6—6—3
HT200
HT200
ZQSn6—6—3
HT200
2Cr13||tt ||35
Standard code
GB1176
GB9439
GB9439
GB1176
GB9439
GB1220||tt| |GB 699
Part name
Transmission shaft
Transmission shaft
Water pump
Union
(Pump base>Import Flange
Coupling, adjusting nut
Taper sleeve
Sealing ring
Transmission gear
4.4.2
JB/T 443-92
Continued Table 3
Material grade
35
40Cr
A3
20
QT450-10
KT35-10
A3
35
35
3Cr13
HT200
40Cr
20CrMnTi
For pumps used to pump domestic water, the materials of parts in contact with water should be free of water pollution. When rubber is used as bearings, the physical properties of the rubber should comply with the requirements of Table 4.
4
To
Find
tensile strength
elongation
permanent deformation
term
Shore A Type hardness
mesh
wear when tested on the wear testing machine
when the temperature is 70℃, the aging coefficient within 72h is 1
Performance index
≥ 12MPa
≥400%
40%
65~75
≤0.2cm*/1.61km
≥0.8
Standard code
GB699
GB3077
GB700
GB699
GB1348
GB 9440
GB 700
GB 699
GB699
GB1220
GB
9439
GB3077
Inspection Standards
GB527
GB528
GB531
GB1689
GB3512
4.5 Manufacturing
4.5.1 Impeller shaft, transmission shaft, transmission device shaft are made of cold drawn steel, machinery The performance should comply with the regulations of GB905, and the dimensional accuracy generally adopts level 10 of GB3078.
4.5.2 The impeller shaft, transmission shaft, and transmission device shaft are based on the outer circles of both ends. Their radial circular runout should comply with the provisions of Table 5, and they are allowed to be re-aligned before assembly.
Table 5
Axis
Peng
's straight
's
control
30
30 -42
>42
Weighing
Blade shaft
0.20
Drive shaft
0.40
0.30||tt ||Transmission shaft
0.20
0.15
0.12
mm
5
JB/T 443--92||tt ||4.5.3 When the impeller is fixed with a taper sleeve, the effective contact area before the opening of the taper hole and the taper sleeve is not less than 60% of the mating area. 4.5.4 The mating surface of the rubber bearing should be smooth, and no flash or pitting is allowed. For rubber bearings without metal shells, their outer diameter should be 0.40-~0 larger than the basic size of the matching hole.90mm. The inner diameter of the assembled rubber bearing should be 0.10~0.40mm larger than the actual size of the matching shaft. 4.5.5 Both ends of the water pipe should be concentric and parallel during processing. 4.5.6 For parts connected with threads, the tolerance and fit of the threads should comply with the regulations of GB197. 4.5.7 The chromium plating of parts should meet the following requirements: the thickness of the chromium layer is 0.080.12mm, and the hardness is ≥50HRC; a.
b. The entire chromium layer, except the edges, is uniformly shiny and has no obvious particles. Defects such as strips, overlaps, cracks, blisters, peeling and flaky pinholes are not allowed.
4.5.8 The welding type and size of carbon steel and low alloy steel parts should comply with the regulations of GB985. The welding rod should be selected based on the strength or chemical composition of the parts to be welded. The weld should not have incomplete penetration, pores, cracks, burn-through, slag inclusions and defects that reduce the connection strength or sealing performance. 4.5.9 Parts that are subject to water pressure should undergo a hydraulic pressure test (except seamless steel pipes). The test pressure is 1.5 times the working pressure. No leakage is allowed during the pressure holding time.
4.5.10 The quality of castings should meet the following requirements: a.
b.
Castings should be cleaned to remove oxide scale and sand; the surface roughness of cast iron parts should comply with Table 6 According to the regulations, the evaluation method is compared with the standard sample specified in GB6060.1; Table 6
Inner surface of impeller (guide vane)
Hao position and size range
mm||tt ||Thickness parameter Ra
pem
480
12.5
Outer
Diameter
Child
inch|| tt||>400
1000
25
>1000
50
The maximum diameter of the inner cavity of the shell-like flow-through part
>350
350
25
600
c. The flow-passing parts of the impeller and guide shell are shown in Figures 1 to 3, and their size deviations are in accordance with Table 7 and Table 8;
non-flow parts that affect the appearance
50||tt| |d. On the machined surfaces for static sealing, centering, positioning and matching, as well as the remaining machined and non-machined surfaces that do not affect the appearance and can meet the requirements of use, casting defects should not exceed the provisions of Table 9: For casting defects that exceed the provisions of Table 9 , Welding repair is allowed on the premise that it does not affect the processability and performance of the cast iron parts; e.
f.
Cast iron parts should generally be aged.
Figure 1
Generation
6
+
Fan
No.
f1-t2t-t4||tt ||Ds
DN
D
D
EE
25
+0.7
0. 2|| tt||+1.0
0
>25
30
+1.0
—0.2
+1.0
—0.5
±2.0
Pole
JB/T 443-92
Figure 2
Figure 3
Table 7||tt ||>30
50
+1.5
-0.2
+1.2
door
±0.5
± 1.5
limited
>50
80
+3.0%
0.5%
+2.5%
o| |tt||±2.0%
+1.5
0.7
bias
>80
120
+2.0||tt| |1.0
±3. 0
Difference
>120
180
+1.5%
-0.5%||tt| |±2.0%
mm
>180
+4.0
-1.0
±4.0
+1.0%||tt| |-0.5%
Add
Generation
No.
Impeller exit angle (\)
Aa()
Defect location| |tt||static sealing surface
centering, positioning
positioning, matching processing surface||tt| It does not
affect the appearance of
surface) and the parts affected by
|The rest of the viewwww.bzxz.net
Working surface
The surface that bears the body
Non
Working
Table
Surface
Pressure surface And
liquid flow surface
does not affect the
functional strength and appearance
other non-
processed surface
defect size
The maximum size shall not exceed
more than 5 mm, and
shall not exceed 1/5 of the smallest
inch of the
area||tt| |Maximum not exceeding
over 5mm and
and not exceeding 1/4 of the
minimum size
tt |
The maximum size shall not exceed
8mm and
and shall not exceed 1/10 of the smallest size
Not exceeding
10mm. And
and not exceeding 1/5
of the minimum size
of the
surface
Note: Defect size D=
8
VLB. Such as:
1
Defect depth
The deepest
does not exceed
5 mm.
and does not
exceed the wall
Thick 1/5
JB/T 443-92
Table 8
Size range
mm
Full||tt ||Part
b,18
b2>18~50
b2>50
Table 9
Root limit deviation
± 15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o
$200
2
>200
#500
3
>$500||tt| |1000
4
741000
Defect spacing
The edge distance of defect
a.
from the surface
side payment is not
smaller than the defect size of
5
2 times
defect
b The edge of .
to
! Edge distance
: not smaller than
notch size
2 times
5 times, no leakage is allowed during the pressure holding time.
4.5.10 The quality of castings should meet the following requirements: a.
b.
Castings should be cleaned to remove oxide scale and sand; the surface roughness of cast iron parts should comply with Table 6 According to the regulations, the evaluation method is compared with the standard sample specified in GB6060.1; Table 6
Inner surface of impeller (guide vane)
Hao position and size range
mm||tt ||Thickness parameter Ra
pem
480
12.5
Outer
Diameter
Child
inch|| tt||>400
1000
25
>1000
50
The maximum diameter of the inner cavity of the shell-like flow-through part
>350
350
25
600
c． The flow-passing parts of the impeller and guide shell are shown in Figures 1 to 3, and their size deviations are in accordance with Table 7 and Table 8;
non-flow parts that affect the appearance
50||tt| |d. On the machined surfaces for static sealing, centering, positioning and matching, as well as the remaining machined and non-machined surfaces that do not affect the appearance and can meet the requirements of use, casting defects should not exceed the provisions of Table 9: For casting defects that exceed the provisions of Table 9 , Welding repair is allowed on the premise that it does not affect the processability and performance of the cast iron parts; e.
f.
Cast iron parts should generally be aged.
Figure 1
Generation
6
+
Fan
No.
f1-t2t-t4||tt ||Ds
DN
D
D
EE
25
+0.7
0. 2|| tt||+1.0
0
>25
30
+1.0
—0.2
+1.0
—0.5
±2.0
Pole
JB/T 443-92
Figure 2
Figure 3
Table 7||tt ||>30
50
+1.5
-0.2
+1.2
door
±0.5
± 1.5
limited
>50
80
+3.0%
0.5%
+2.5%
o| |tt||±2.0%
+1.5
0.7
bias
>80
120
+2.0||tt| |1.0
±3. 0
Difference
>120
180
+1.5%
-0.5%||tt| |±2.0%
mm
>180
+4.0
-1.0
±4.0
+1.0%||tt| |-0.5%
Add
Generation
No.
Impeller exit angle (\)
Aa()
Defect location| |tt||static sealing surface
centering, positioning
positioning, matching processing surface||tt| It does not
affect the appearance of
surface) and the parts affected by
|The rest of the view
Working surface
The surface that bears the body
Non
Working
Table
Surface
Pressure surface And
liquid flow surface
does not affect the
functional strength and appearance
other non-
processed surface
defect size
The maximum size shall not exceed
more than 5 mm, and
shall not exceed 1/5 of the smallest
inch of the
area||tt| |Maximum not exceeding
over 5mm and
and not exceeding 1/4 of the
minimum size
tt |
The maximum size shall not exceed
8mm and
and shall not exceed 1/10 of the smallest size
Not exceeding
10mm. And
and not exceeding 1/5
of the minimum size
of the
surface
Note: Defect size D=
8
VLB. Such as:
1
Defect depth
The deepest
does not exceed
5 mm.
and does not
exceed the wall
Thick 1/5
JB/T 443-92
Table 8
Size range
mm
Full||tt ||Part
b,18
b2>18~50
b2>50
Table 9
Root limit deviation
± 15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o
$200
2
>200
#500
3
>$500||tt| |1000
4
741000
Defect spacing
The edge distance of defect
a.
from the surface
side payment is not
smaller than the defect size of
5
2 times
defect
b The edge of .
to
! Edge distance
: not less than
2 times
of the defect size
5 times, no leakage is allowed during the pressure holding time.
4.5.10 The quality of castings should meet the following requirements: a.
b.
Castings should be cleaned to remove oxide scale and sand; the surface roughness of cast iron parts should comply with Table 6 According to the regulations, the evaluation method is compared with the standard sample specified in GB6060.1; Table 6
Inner surface of impeller (guide vane)
Hao position and size range
mm||tt ||Thickness parameter Ra
pem
480
12.5
Outer
Diameter
Child
inch|| tt||>400
1000
25
>1000
50
Maximum diameter of the inner cavity of the shell type flow parts
>350
350
25
600
c. The flow-passing parts of the impeller and guide shell are shown in Figures 1 to 3, and their size deviations are in accordance with Table 7 and Table 8;
non-flow parts that affect the appearance
50||tt| |d. On the machined surfaces for static sealing, centering, positioning and matching, as well as the remaining machined and non-machined surfaces that do not affect the appearance and can meet the requirements of use, casting defects should not exceed the provisions of Table 9: For casting defects that exceed the provisions of Table 9 , Welding repair is allowed on the premise that it does not affect the processability and performance of the cast iron parts; e.
f.
Cast iron parts should generally be aged.
Figure 1
Generation
6
+
Fan
No.
f1-t2t-t4||tt ||Ds
DN
D
D
EE
25
+0.7
0. 2|| tt||+1.0
0
>25
30
+1.0
—0.2
+1.0
—0.5
±2.0
Pole
JB/T 443-92
Figure 2
Figure 3
Table 7||tt ||>30
50
+1.5
-0.2
+1.2
door
±0.5
± 1.5
limited
>50
80
+3.0%
0.5%
+2.5%
o| |tt||±2.0%
+1.5
0.7
bias
>80
120
+2.0||tt| |1.0
±3. 0
Difference
>120
180
+1.5%
-0.5%||tt| |±2.0%
mm
>180
+4.0
-1.0
±4.0
+1.0%||tt| |-0.5%
Add
Generation
No.
Impeller exit angle (\)
Aa()
Defect location| |tt||static sealing surface
centering, positioning
positioning, matching machining surface
transmitting torque||tt| It does not
affect the appearance of
surface) and the parts affected by
|The rest of the view
Working surface
The surface that bears the body
Non
Working
Table
Surface
Pressure surface And
liquid flow surface
does not affect the
functional strength and appearance
other non-
processed surface
defect size
The maximum size shall not exceed
more than 5 mm, and
shall not exceed 1/5 of the smallest
inch of the
area||tt| |Maximum not exceeding
over 5mm and
and not exceeding 1/4 of the
minimum size
tt |
The maximum size shall not exceed
8mm and
and shall not exceed 1/10 of the smallest size
Not exceeding
10mm. And
and not exceeding 1/5
of the minimum size
of the
surface
Note: Defect size D=
8
VLB. Such as:
1
Defect depth
The deepest
does not exceed
5 mm.
and does not
exceed the wall
Thick 1/5
JB/T 443-92
Table 8
Size range
mm
Full||tt ||Part
b,18
b2>18~50
b2>50
Table 9
Root limit deviation
± 15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o
$200
2
>200
#500
3
>$500||tt| |1000
4
741000
Defect spacing
The edge distance of defect
a.
from the surface
side payment is not
smaller than the defect size of
5
2 times
defect
b The edge of .
to
! Edge distance
: not less than
2 times
of the defect size
0
0
>25
30
+1.0
—0.2
+1.0
—0.5|| tt||±2.0
pole
JB/T 443-92
Figure 2
Figure 3
Table 7
>30
50
+1.5
-0.2
+1.2
door
±0.5
±1.5||tt ||Limited
>50
80
+3.0%
0.5%
+2.5%
o
±2.0%
+1.5
0.7
bias
>80
120
+2.0
1.0|| tt||±3. 0
Difference
>120
180
+1.5%
-0.5%
±2.0%
mm
>180
+4.0
-1.0
±4.0
+1.0%
-0.5%
Add
Generation
No.
Impeller exit angle (\)
Aa()
The defective surface
Static sealing surface
centering, positioning
, and matching processing surface
transmitting torque
||affects the appearance
of the surface) and the parts affected by
does not affect the use strength and appearance of
Add
working surface
bearing body
non
work
table
surface
pressure surface and||tt ||Liquid flow surface
does not affect the strength and appearance of
other non-
machined surfaces
defect size ||tt| |The maximum does not exceed
exceeds 5 mm, and
does not exceed 1/5 of the smallest
inch on the
surface
The maximum does not exceed
exceeds 5mm and
does not exceed 1/4 of the smallest
inch on the surface
2 mm | |Maximum not exceeding
over 8mm and
and not exceeding 1/10 of the
minimum size
tt|| exceeds 10mm. and
and does not exceed 1/5 of the smallest size
|8
VLB. Such as:
1
Defect depth
The deepest
does not exceed
5 mm.
and does not
exceed the wall
Thick 1/5
JB/T 443-92
Table 8
Size range
mm
Full||tt ||Part
b,18
b2>18~50
b2>50
Table 9
Root limit deviation
± 15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o
$200
2
>200
#500
3
>$500||tt| |1000
4
741000
Defect spacing
The edge distance of defect
a.
from the surface
side payment is not
smaller than the defect size of
5
2 times
defect
b The edge of .
to
! Edge distance
: not less than
2 times
of the defect size
0
0
>25
30
+1.0
—0.2
+1.0
—0.5|| tt||±2.0
pole
JB/T 443-92
Figure 2
Figure 3
Table 7
>30
50
+1.5
-0.2
+1.2
door
±0.5
±1.5||tt ||Limited
>50
80
+3.0%
0.5%
+2.5%
o
±2.0%
+1.5
0.7
bias
>80
120
+2.0
1.0|| tt||±3. 0
Difference
>120
180
+1.5%
-0.5%
±2.0%
mm
>180
+4.0
-1.0
±4.0
+1.0%
-0.5%
Add
Generation
No.
Impeller exit angle (\)
Aa()
The defective surface
Static sealing surface
centering, positioning
, and matching processing surface
transmitting torque
||affects the appearance
of the surface) and the parts affected by
does not affect the use strength and appearance of
Add
working surface
bearing body
non
work
table
surface
pressure surface and||tt ||Liquid flow surface
does not affect the strength and appearance of
other non-
machined surfaces
defect size ||tt| |The maximum does not exceed
exceeds 5 mm, and
does not exceed 1/5 of the smallest
inch on the
surface
The maximum does not exceed
exceeds 5mm and
does not exceed 1/4 of the smallest
inch on the surface
2 mm | |Maximum not exceeding
over 8mm and
and not exceeding 1/10 of the
minimum size
tt|| exceeds 10mm. and
and does not exceed 1/5 of the smallest size
|8
VLB. Such as:
1
Defect depth
The deepest
does not exceed
5 mm.
and does not
exceed the wall
Thick 1/5
JB/T 443-92
Table 8
Size range
mm
Full||tt ||Part
b,18
b2>18~50
b2>50
Table 9
Root limit deviation
± 15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o
$200
2
>200
#500
3
>$500||tt| |1000
4
741000
Defect spacing
The edge distance of defect
a.
from the surface
side payment is not
smaller than the defect size of
5
2 times
defect
b The edge of .
to
! Edge distance
: not less than
2 times
of the defect size
18
b2>18~50
b2>50
Table 9
Root limit deviation
±15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o||tt ||$200
2
>200
#500
3
>$500
1000
4|| tt||741000
Defect distance
Defect
a.
|tt||The edge of the defect
b.
is smaller than the defect size
5
2 times
|tt||! Edge distance
: not less than
2 times
of the defect size
18
b2>18~50
b2>50
Table 9
Root limit deviation
±15%
±5°
±4*
±3°
Number of casting defects on the same plane
100
1
>e0o||tt ||$200
2
>200
#500
3
>$500
1000
4|| tt||741000
Defect distance
Defect
a.
|tt||The edge of the defect
b.
is smaller than the defect size
5
2 times
|tt||! Edge distance
: not less than
2 times
of the defect size
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