JB/T 8126.2-1999 Internal combustion engine cooling water pump performance test method
Some standard content:
ICS27.020
Machinery Industry Standard of the People's Republic of China
JB/T8126.1-8126.2—1999
Internal combustion engines-Cooling water pumps
Intcrual combustion engines-Cooling water pumps1999-09-17 Issued
State Machinery Industry Bureau
2000-01-01 Implementation
JB/T8126.2-1999
This standard is a revision of JB/T812695 (formerly GB1883-R0, GB18B2-89) (Performance test method for cooling water pumps for internal combustion engines.
Compared with JB/T812G-95, this standard has the following main technical changes: Added gas pressure test requirements;
Revised the test methods for head and power. This standard is part of the series of standards JB/TB126-1999 "Cooling Water System for Internal Combustion Engines". This series of standards includes the following parts:
JB/TB126.1-1999 Technical Conditions for Cooling Water Pumps for Internal Combustion Engines JB/ T8126.2—1999 Performance test of cooling water pump for internal combustion engine This standard shall replace JB/T8126—95 from the date of implementation. The appendix of this standard is a reminder. This standard was proposed and approved by the National Technical Committee for Standardization of Internal Combustion Engines. The drafting units of this standard are: Shanghai Internal Combustion Engine Research Institute, Tianjin Automobile Water Pump Co., Ltd., Guangxi Jialin Automobile Parts Factory, Beijing Automobile Tiger Pump Factory, Wuguo Xixin Automobile Water Pump Factory. The main drafters of this standard are: Shi Aiping, Liu Runmin, Lu Shusheng, Li Yong, Ding Chajie. 1 Scope
Machinery Industry Standard of the People's Republic of China
Internal combustion engine cooling water pumps
Performance test methods
Internal combustion engine cooling water pumps
JET8126.2-1999
Replacement 8126--95
This standard specifies the test items, test conditions, test methods, performance parameter calculation, test report, etc. for centrifugal cooling water pumps for small and medium-sized internal combustion engines without self-priming requirements (hereinafter referred to as water pumps). 2 Referenced standards
The following standards contain the following provisions: The provisions of this standard are constituted by reference in this standard: When the standard is revised, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest version of the following standard. GB3214-1991 Method for measuring water pump flow 3 Test items
3.1 Performance test.
3.2 Cavitation test
When a new product is developed or the product has a major design change. Cavitation test should be carried out. 3.3 Product test.
4 Test conditions
4.1 The water pump to be tested must pass the inspection.
4.2 The test medium is water,
.3 Test medium temperature,
b) For performance test and steam test, the water temperature is 80℃±2℃ b) During factory test, the water temperature is within the range of 0-40℃, 4.4 Test instruments, and the instruments are qualified. 4.5 Performance test and cavitation test should be carried out on a closed test bench, as shown in Figure 1. 4.6 Performance test must be carried out after the air in the pipeline is removed. Approved by the State Bureau of Machinery Industry on September 17, 1999 and implemented on January 1, 2000
5 Test method
JB/T8126.2-1999
1-Dynamometer: 2-Water meter: 3-Water pressure gauge: 4-Gauge: -Inlet gauge: 6-Full gauge, 7-Pressure regulating valve: B-Venting chamber: 9-Safety room: 10-Vacuum pressure gauge; 11-Direct air valve]: [2-Water level gauge, 1.-Water tank inlet net: 14-Micro water width: 15-Sealed water screen: 16-Heater: 17-Reading meter, 18-Water inlet room Figure 1 Closed test bench schematic diagram
5. Performance test
Test the flow rate, head and shaft power of the water pump at different speeds, and draw a curve diagram of the relationship between head, shaft power, pump efficiency and flow rate
5.1.1 Select four or more different speeds within the specified speed range for testing. The test speed fluctuation range shall not exceed 10+5min. Under the limited flow rate, the fluctuation range shall not exceed ±%. 5.1.2 At each test speed, no less than 6 flow points shall be evenly selected for testing. 5.1.3 When measuring data, the instruments used shall be read at the same time. 5.2 Steam test
Measure the lift and cavitation total shock absorbance (NPSH) of the water pump at the specified speed and flow rate, and draw a curve diagram of the relationship between head and steam head. 5.2.1 At the specified speed, test the required flow points. During the test, measure the speed, head, inlet pressure and water level. 5.2.2 During the steam test, the change of the pump head can be divided into two stages: a) the stage where the head H does not change with the steam residual pressure (NPSII); b) the stage where the head changes sharply with the NPSH (NPSII), that is, the fracture stage. 5.2.3 When testing each flow rate, the number of different NPSH should be less than 10, and in the stage where the NPSH is close to the critical value, the NPSH interval should be smaller. 5.1.4 During the steam test, the NPSH must be increased in the direction from large to small. 5.2.5 The connection at the water inlet pipe must be reliable to ensure sealing. 5.3 Factory test
5.3. [Sealing test (choose one of the following two methods) 5.3.1.1 The water pump shall be subjected to 100% water pressure sealing test according to the following provisions: a) The water pump shall be operated continuously for 3min at the rated speed specified in the product drawing: 8
JBT6126.2-1999
6) The water pump in the water inlet of the water seal shall be installed. The water inlet shall be 50kP: The water shall be evenly matched with the water slurry in the water outlet, and the static pressure shall be added to 1.5 times of the pressure for 3minc5.3.1.2 The compressed air shall be passed through the water spring, and the pressure shall be (50+5) kPa, the half-balance time shall be 10, and the test time shall be 5s. The product shall be in compliance with the requirements.
5.3.2 Determine whether the rated speed, pump speed under flow rate, etc. meet the requirements as required. 5.3.3 During the special test, the pump shall not have abnormal noise or vibration. 6 Performance parameter calculation, measurement method and measuring instrument 6.1 Head determination
6.1 Head is the power of the pump on the unit weight of liquid, and is the increase in the energy of the unit weight of the liquid after passing through the water. According to formula (1)-formula (3): The head, meaning:
R_1000×(8,-P)
—temperature at the test temperature, k/m,
——inlet and outlet pressure, kPa;
2,2,—measurement pressure P, and p, the vertical height from the center of the water slurry to the center, m;, - Lelili, the average connection on the cross section of the pressure taking part, the original speed, m/s*, under normal circumstances, take g=9.81m/s* first-class type, ms:
2.--The inner diameter of the cross section of the outlet joint, m
The inner diameter of the inlet piece, m
6.1.2, the output force sensor and digital instrument are measured, according to Wu (4: calculation: 10004-
Formula: Ap inlet, only the total: kPa.
After single conversion, Yang Cheng calculated according to formula (5): pg
1000AF+2 2.95x
Where: Q is the value, I./min;
Internal diameter of the outlet, :
Internal diameter of the inlet, m.
6.1.3 When selecting a pressure sensor, the pressure sensor should be selected according to the measured force. The accuracy should not be less than 0.54)
6.1.4 The inlet pressure measuring pipe is a good pipe, and its inner diameter d is equal to or close to the inner diameter d of the water inlet pipe, and the total length L is not less than 15d: When installing, the axis of the pressure measuring pipe should be aligned with the axis of the water pump inlet pipe, and the distance between the two should not be less than 2d from the water system connection end, and the pressure taking hole should be opened.
JE/T8126.2—1999
6.1.5 The inlet pipe should have enough stagnation depth to ensure that the flow rate remains stable when the water system is working: 61.6. When the outlet section is a round pipe, the outlet pressure pipe is a straight pipe, and the inner wall section should be equal to or close to the pump outlet diameter. Its length L should not be less than 50 mm. When the outlet surface is non-round, the outlet pressure pipe is a straight pipe, and the inner wall section is the same as the outlet, and its length L should not be less than 1/2". The length of the transition section from the non-circular section should be less than 2 mm.) The position of the outlet hole is 24 or 84 mm away from the outlet flange. 6.1. The straight hole line should be perpendicular to the inner wall of the pipe, and the edges should not be rough. The maximum hole diameter should be 21 mm or 110 mm of the inner diameter of the pipe, and the minimum depth should be no less than 25 mm (see Figure 25). 6.1. 8. Pressure measuring instrument The air in the pipeline between the tapping hole and the flow meter must be removed to avoid measurement errors. 6.2 Full flow measurement
6.2.1 Flow rate is the amount of liquid output per unit time in a water system. 6.2.2 Turbine flowmeters can be used for flow measurement, and their accuracy should not be lower than Class 1. 6.2.3 According to the maximum flow rate of the measured water system, select a turbine flowmeter with an appropriate range: 6.2.4 Flow measurement instruments can also be used according to the provisions of GB/T3214, and their measurement accuracy should not be lower than Class 1. 6. 3 Speed determination
6.3.1 Speed refers to the number of revolutions of the pump shaft at every minute. 6.3.1 Speed measurement instrument should be accurate to 0.2 level. 6.4 Temperature measurement
The instrument should be accurate to not less than 0.5 in the test volume
6.5 Shaft power measurement
6.5. [The shaft method refers to the power of the prime mover to deliver water. 6.5.2 Shaft power is measured by speed-torque meter. 6.5.3 Shaft Calculate according to formula (6):
Where: P axis power, kw:
square torque, Nm;
speed, rmi
JD/T8126.2—1999
6.5.4 The accuracy of the speed-torque meter should not be less than 0.5 level. 6.6 Pump efficiency
6.6.1 Pump efficiency refers to the ratio of the effective power of the pump to its power. 6.6.1, 1 Effective power
The energy obtained by the liquid flowing through the pump in a single life time is called the average power method. 6.6.1.2 Pump efficiency is calculated by formula 171: P
Pump efficiency, kw:
6.6. 2 The pump efficiency is calculated according to formula (8): Formula: Pump efficiency, %.
6.7 Determination of steam surplus (NPSH)
6..1 Steam surplus (NPSH)
eoHgx10
×100%
The steam position surplus (YPSH) is the excess energy per unit weight of the mother liquid exceeding the saturated steam pressure at the inlet of the water making case. Its value is actually converted to the center of the water spring
6.7.2 The cavitation surplus is calculated according to branch (9): Where: NPSH steam shortage surplus,
H—total inlet head, m;
NPSH - H, + L000×(PP.)
P——atmosphere during the test, kPa
P——test temperature of water vaporization k is [absolute force), kP6.7.2.1 The following is the calculation using the comparative force sensor measurement mother time control formula (10); n,=z+1000+
Where:
The vertical distance from the force sensor to the center of the water pump, north; When the sensor is higher than the center of the water pump, Z is the value: On the contrary, Z is a negative value:
a Inlet reading, kPap, is a positive value; p, is a value, 6.7.3 Critical steam residual pressure (NPSH) c
Input steam turbidity residual pressure (NPSH). It refers to the residual product of the steam when the head and the residual steam volume are reduced by 2%. Test results
7.1 Water seal parameters and test points:
a) Pump model:
b) Impeller type:
e) Number of blades:
d) Impeller outer diameter:
JB/18126.2—1999
Water seal installation position (inlet flow channel or outlet flow channel) Force displacement speed: || tt||g≤production 7,
7.2 Test equipment and instruments:
7.3 Test results European summary
7.4 Performance and continuation diagram
7.4.1 Use characteristic state (see 3.
7.4.2 Cavitation performance line (see 1 piece
p-2500
m-200h
T·3500
#-306C
y-7 smn
J-2uuo
General characteristics horizontal
1sn60c
:HFsH).-7 7:1m
(NPNHX3.0 501r
JE/E8126.2—1999
$000rmi
EfCfin
Circuit 4 Cavitation performance curve
-000r.imin.$0L,\a
(MPSH)M
Physical properties of water are shown in Table A1
JA/8126.2 1999
Record A
(slow-motion recording)
Physical properties of waterwwW.bzxz.Net
! Xinghua pressure
Jianghua pressure
Vaporization pressure
64:11h
E/T$126.2-1994
Table A1 (end)
Vaporization pressure
i1 Water seal number and waiting point:
a) Pump model:
b) Impeller blade type:
e) Number of blades:
d) Impeller outer diameter:
JB/18126.2—1999
Water seal installation position (inlet flow channel or outlet flow channel) Force displacement speed:
g≤7,
7.2 Test equipment Equipment and instrumentation:
7.3 Test results
7.4 Performance and continuation diagram
7.4.1 Application characteristics (see 3.
7.4.2 Cavitation performance line (see 1 piece
p-2500
m-200h
T·3500
#-306C
y-7 smn
J-2uuo
General characteristics
1sn60c
:HFsH).-7 7:1m
(NPNHX3.0 501r
JE/E8126.2—1999
$000rmi
EfCfin
Circuit 4 Cavitation performance curve
-000r.imin.$0L,\a
(MPSH)M
Physical properties of water are shown in Table A1
JA/8126.2 1999
Record A
(slow-motion recording)
Physical properties of water
! Xinghua pressure
Jianghua pressure
Vaporization pressure
64:11h
E/T$126.2-1994
Table A1 (end)
Vaporization pressure
i1 Water seal number and waiting point:
a) Pump model:
b) Impeller blade type:
e) Number of blades:
d) Impeller outer diameter:
JB/18126.2—1999
Water seal installation position (inlet flow channel or outlet flow channel) Force displacement speed:
g≤7,
7.2 Test equipment Equipment and instrumentation:
7.3 Test results
7.4 Performance and continuation diagram
7.4.1 Application characteristics (see 3.
7.4.2 Cavitation performance line (see 1 piece
p-2500
m-200h
T·3500
#-306C
y-7 smn
J-2uuo
General characteristics
1sn60c
:HFsH).-7 7:1m
(NPNHX3.0 501r
JE/E8126.2—1999
$000rmi
EfCfin
Circuit 4 Cavitation performance curve
-000r.imin.$0L,\a
(MPSH)M
Physical properties of water are shown in Table A1
JA/8126.2 1999
Record A
(slow-motion recording)
Physical properties of water
! Xinghua pressure
Jianghua pressure
Vaporization pressure
64:11h
E/T$126.2-1994
Table A1 (end)
Vaporization pressure
i
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