This standard specifies the test methods for refrigeration compressors for automotive air conditioners. This standard applies to open-type refrigeration compressors (hereinafter referred to as compressors) with a cylinder volume not exceeding 600 mL and refrigerant R12 and R134a used in air conditioners of various road vehicles (including traffic vehicles, transport vehicles, household vehicles, engineering vehicles, special vehicles, etc.) and operating machinery (including agricultural machinery, engineering machinery, mining machinery, etc.). The compressors used for other vehicles and machinery can refer to this standard. JB/T 6915-1993 Test methods for refrigeration compressors for automotive air conditioners JB/T6915-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Refrigeration compressor for automobile air conditioner
Test method
1 Subject content and scope of application
This standard specifies the test method for refrigeration compressor for automobile air conditioner JB/T 6915-93
This standard is applicable to open refrigeration compressors (hereinafter referred to as compressors) with a cylinder volume not exceeding 600mL and refrigerant R12 and R134a used in air conditioners of various road vehicles (including traffic vehicles, transport vehicles, household vehicles, engineering vehicles, special vehicles, etc.) and operating machinery (including agricultural machinery, engineering machinery, mining machinery, etc.). Other vehicles and machinery that use compressors can refer to this standard for implementation. 2 Reference standards
GB2423.5 Basic environmental test procedures for electrical and electronic products Test Ea: Impact test method GB2423.17 Basic environmental test procedures for electrical and electronic products Test Ka: Salt spray test method GB5773 Performance test method for positive displacement refrigeration compressors GB7778 Refrigerant numbering method
GB10873 Test method for small piston single-stage refrigeration compressors JB4330 Engineering method for determination of sound power level of noise in refrigeration and air-conditioning equipment ZBI73027 General provisions for determination of cleanliness of refrigeration equipment 3 Test provisions
3.1 Ambient temperature
Except for special provisions in this standard, the test ambient temperature is generally 10~35℃. 3.2 Test refrigerant circulation system
3.2.1 Remove non-condensable gases in the system and confirm that there is no refrigerant leakage. 3.2.2 There is enough refrigerant in the system that meets the requirements of relevant standards. 3.2.3 The pressure and temperature of the compressor suction and exhaust ports are measured at the same location, which should be a straight pipe section 300mm outside the suction and exhaust stop valves (for compressors without stop valves, it should be at the distance from the compressor housing). 3.3 Measuring instruments and accuracy
3.3.1 The types of instruments used in the test can be measured by one or more types. 3.3.2 The instruments used in the test should have a calibration certificate within the valid use period calibrated by the measurement or relevant departments. 3.3.3 Except for special provisions in this standard, the instruments used in the test should comply with the provisions of Article 2.4 of GB5773. 3.4 Nominal test conditions
The nominal test conditions for determining the nominal control volume of the compressor shall be in accordance with the provisions of Table 1. Approved by the Ministry of Machinery Industry of the People's Republic of China on July 13, 1993 and implemented on July 1, 1994
567
Compressor speed
r/min
1800
4 Test method
Suction pressure corresponding to
Saturation temperature
1.1
4.1 Exhaust valve leakage rate test
JB/T 6915—93
Table 1
Exhaust pressure corresponding to
Saturation temperature
62.8
Suction
Temperature
7.2
Refrigerant
Subcooling temperature
57.8
Compressor
Ambient temperature
≥65
Install the compressor on the refrigerant circulation system, start the compressor and run it for at least 10 minutes to ensure that the valve plate and valve disc of the compressor are sealed. After operation, immediately fill the compressor with dry and clean air (dew point temperature below -40℃) or a mixture of nitrogen and refrigerant (where the partial pressure of the refrigerant should not be less than 0.30MPa) with a temperature not lower than 15℃ from the exhaust port of the compressor. When the pressure of the high-pressure chamber of the compressor is between 0.58 and 0.62MPa (absolute pressure unless otherwise specified, the same below), use a float flowmeter with an accuracy of not less than 1.5 to measure on the suction pipe of the compressor. 4.2 Refrigerant leakage test
4.2.1 Place the compressor sealed with protective gas in the test room for 8 hours, and record the pressure of the protective gas in the compressor and the ambient temperature every 1 hour.
4.2.2 Fill the compressor with pure refrigerant gas or a mixture of refrigerant gas and dry and clean air (or nitrogen) with a dew point temperature below -40℃ (where the partial pressure of the refrigerant gas should not be less than 0.30MPa) and pressurize it to 0.62~~0.65MPa. After 2 minutes, use a halogen leak detector with a measurement accuracy within 101.33PaL/s (used according to the method specified by the manufacturer) to check and record all static and dynamic sealing parts of the compressor one by one.
4.2.3 The refrigerant leakage of the compressor is the sum of the refrigerant leakage of all static and dynamic sealing parts. 4.3 Test for determination of internal cleanliness of the whole machine
The test method for determination of internal cleanliness of the whole machine shall be in accordance with the provisions of Appendix A (Supplement). 4.4 Test for residual moisture inside the whole machine
The test method for residual moisture inside the whole machine shall be in accordance with the provisions of Appendix B (Supplement). 4.5 Performance test of compressor
The performance test of the compressor shall be carried out under the nominal working conditions specified in Table 1, and the test method shall be in accordance with the provisions of GB5773. It is allowed not to carry out a check test during the test. In order to ensure the accuracy of the test results, a recheck test shall be carried out under the same conditions (the machine shall be shut down for at least 1 hour before the recheck test, but the amount of refrigerant and lubricating oil in the test system shall not be changed). The deviation of the test results shall comply with the provisions of Table 2. It is required to measure the nominal cooling capacity, shaft input power and performance coefficient of the compressor. The test result is the average of two measurement results. Table 2
Performance parameters
Cooling capacity
Shaft input power
Performance coefficient
4.6 Noise test
The maximum allowable deviation of any measurement result of the performance parameter relative to the average value, %±1.0
±1.5
±2.0
4.6.1 The refrigerant circulation system outside the measurement environment shall have the conditions to control the exhaust pressure, suction pressure and suction temperature of the compressor.
4.6.2 The compressor drive device outside the measurement environment shall have the conditions to control the compressor speed. 4.6.3 Use the compressor installation method specified by the compressor manufacturer (when there are several installation methods, the most unfavorable one should be used) to fasten the compressor to the test bench in the measurement environment, and install and connect it with the drive device and refrigerant circulation system outside the measurement environment. 4.6.4 The test conditions shall be in accordance with the provisions of Table 3.
568
Compressor speed, r/min
1800
JB/T 6915—93
Table 3
Suction pressure, MPa
0. 289 ~ 0. 307
4.6.5 The measurement method shall be in accordance with the provisions of JB4330. 4.7 Salt spray test
Exhaust pressure, MPa
1. 5891. 654
Suction temperature,
4.210.2
4.7. Use appropriate non-corrosive or non-protective film cleaning agents to rinse or rinse the entire outer surface of the compressor to remove dust and oil on the surface of the compressor, and then place the compressor in the test room to dry naturally. After its surface is dry, perform an appearance inspection and record it.
4.7.2 Use the compressor installation method specified by the compressor manufacturer (when there are several installation methods, the same number of compressors should be installed in different ways) to install the compressor in the salt spray test device. During installation, the distance between the compressors should not affect the free fall of salt spray on the tested compressor, and the salt solution on any compressor should not drip on other compressors. 4.7.3 After the installation is correct, the test shall be carried out in accordance with the provisions of GB2423.17. The test duration shall be no less than 48 hours. 4.7.4 After the test, the compressor is taken out of the salt spray test device and placed in the test room. After 48 hours, the compressor is rinsed or rinsed with running water (temperature not higher than 35) to remove the salt deposits on the compressor surface, and then rinsed in distilled water (temperature not higher than 35C), and then the compressor is placed in the test room to dry naturally for 2 hours. If there is water deposited on the surface of the compressor after 2 hours of natural drying, it should be blown dry immediately with a hair dryer, and the appearance of the compressor should be inspected and recorded in time. 4.7.5 Special care should be taken during the cleaning and installation process, and no additional artificial defects should be caused on the surface of the compressor. 4.8 Durability Test
4.8.1 The durability test device should have conditions that can control the speed, suction pressure, exhaust pressure, suction temperature and ambient temperature of the compressor, and should also have protection measures for temperature, pressure and pressure difference. 4.8.2 Use the installation method specified by the compressor manufacturer (when there are several installation methods, the most unfavorable one should be used) to fasten the compressor to the durability test device. 4.8.3 Durability test conditions
4.8.3.1 When the compressor is driven by the main engine, the working conditions of the durability test are as specified in Table 4. Table 4
Test conditions items
Compressor speed, r/min
Discharge pressure
Suction pressure
MPa
Compressor ambient temperature, ℃
Clutch cycle
Running time
On
Off
Low speed test
510-~770
2. 51~~2.86
0.38~0.45
104~116
10 min
1min
500h||tt| |Business speed test
4 500~~5 500
1.271.34
10 s
0.13~~0.24
60~71||tt ||5s
4.8.3.2 When the compressor is driven by an auxiliary engine, the working conditions of the durability test shall be as specified in Table 5. Ultra-high speed test
6500
1.13~1. 28
5s
5 min
569
Test conditions||tt| |Nominal working condition
Maximum power working condition
Low suction pressure working condition
Low speed working condition
High speed working condition
Compressor speed|| tt||r/min
1 600~-2 000
2 200~2 700
1 2001 600
2 800~3 000
JB/T 6915—93
Qiu 5
Suction pressure
0.26~0. 34
0. 38~0. 45
0.13- 0.24
0.26-0.34
MPa
Exhaust pressure
1. 53~1. 66
1.59~1.81
1. 77~1. 97
1.27~1.34
Compressor ambient temperature
C
70±5
Running time
h| |tt||300
200
100
4.8.4 After checking that the installation is correct, eliminate the non-condensable gas in the compressor and connecting pipes, and then start the compressor according to Section 4.8 .Operate under the durability test conditions specified in Article 3. The compressor should run normally during operation, otherwise it should be stopped immediately for inspection and the cause of the failure should be analyzed. If the fault is not caused by the compressor itself, continue testing after troubleshooting. All tests conducted before shutdown are valid. Otherwise, the test is invalid. 4.8.5 Before the durability test, the compression being tested shall undergo the following tests: exhaust valve leakage rate test, in accordance with the provisions of Article 4.1; a.
refrigerant leakage test, in accordance with the provisions of Article 4.2 regulations; b.
The performance test of the compressor shall be in accordance with the provisions of Article 4.5; c.
d. Noise test shall be in accordance with the provisions of Article 4.6. 4.8.6 After the durability test is completed, the tests specified in Article 4.8.5 should be repeated. 4.8.7 After completing the tests specified in Article 4.8.6, disassemble and inspect the compressor. All parts and components should not be damaged. 4.9 Impact test
4.9.1 Use the installation method specified by the compressor manufacturer (when there are several installation methods, the most unfavorable one should be used) to fasten the compressor on the impact testing machine. When clamping, the clamp should be able to enable the compressor under test to withstand impacts in all directions specified in Article 4.9.3. In order to minimize the weight of the main drive system and the compressor under test, the installation fixture should be made of aluminum alloy. If the compressor under test is equipped with a special fixture, this fixture should be used. 4.9.2 The compressor is in non-working state during the test, and the test conditions are as specified in Table 6. Table 6
Compressor
Drive mode
Main engine drive
Auxiliary engine drive
Impact waveform
Rear peak sawtooth impact|| tt||pulse wave
peak acceleration
g
35
20
pulse duration
ms
11
Corresponding speed change
m/s
1.92
1.10
4.9.3 The test method is in accordance with the provisions of GB2423.5, and the requirements are in the following The compressor's center of gravity is the origin of three consecutive impacts in each direction of three mutually perpendicular axes (18 times in total). 4.9.4 Before the impact test, the compressor under test should be visually inspected. There should be no cracks or other damage on the surface of the exposed parts and components of the compressor, and the fastening parts should not be loose.
4.9.5 After the impact test in each test direction, the inspections specified in Article 4.9.4 should be repeated. 4.9.6 After all tests are completed, disassemble and inspect the compressor. 570
A1 preparation
JB/T 6915—93
Appendix A
Method for determination of internal cleanliness of the complete machine
(supplement)||tt ||According to the provisions of Chapter 6 of ZBJ73027, prepare the operators, measuring instruments and testing rooms before measurement. The testing room is required to use a clean room that complies with Article 6.3 of ZBJ73027. A2 General requirements
According to the provisions of Chapter 4 of ZBJ73027, all parts and components should be operated consistently during the cleaning process so that the results have high repeatability and reproducibility.
A3 cleaning parts
The cleaning parts are all surfaces, holes and gaps in the compressor that come into contact with refrigerant and lubricating oil. A4 cleaning
A4.1
Tools and cleaning Liquid
a.
White nylon round and flat brushes of different specifications; b.
Tang porcelain containers with lids of different specifications, stainless steel tweezers with flat and toothless ends; c.
Magnet:
pressure washing equipment, configured according to the provisions of Appendix A (Supplement) of ZBJ73027; d.
e. The cleaning fluid is NY-120 solvent oil. According to the regulations of GB1922, its dosage is determined according to the specific situation. A4.2 Cleaning methods and requirements
Cleaning methods and requirements are in accordance with Article 7.1 of ZBJ73027. A4.3 Cleaning of parts and components
A4.3.1 Collect the refrigeration oil filled in the compressor into a covered container, A4.3.2 Disassemble all the parts and components of each detachable part of the compressor Turn it on, and use a flat brush and a round brush soaked in cleaning fluid to repeatedly scrub the surfaces and pores of each part and component that should be cleaned.
A4.3.3 Use pressure washing equipment to clean the holes and gaps in various parts and components. A4.3.4 Use clean cleaning fluid to fully rinse or rinse the cleaning parts of each component. A4.3.5 Collect all the turbid liquid after cleaning in a sugar porcelain container with a lid. A5 filtration
According to the provisions of Article 7.2 of ZBJ73027, perform full liquid filtration of turbid liquid and lubricating oil respectively. A5.1
A5.2 After filtration, fully rinse the inner wall of the container where the turbid liquid and lubricating oil are collected with clean flushing fluid. The cleaned turbid liquid shall be filtered according to the provisions of Article 7.2 of ZBJ73027.
A6 Drying, weighing and calculation
Drying, weighing and calculation shall be carried out according to the provisions of Article 7.3 of ZBJ73027. 571
A7 impurity analysis
JB/T 6915—93
Carry out analysis according to the gravimetric method specified in Article 7.5 of 7ZBJ73027, and record the analysis results in the determination and analysis of cleanliness Reporting.
Appendix B
Measurement method of residual moisture content inside the whole machine (supplement)
B1 test device
The measuring device for the residual moisture content inside the whole machine is shown in Figure B1 Show. Its empty table
.80±5℃
Toad press
Constant temperature drying oven
B2 test
Deadline reading V
Picture B1 | Place the compressor in a constant temperature drying oven (if the compressor has been filled with protective gas, the protective gas should be released until it is equal to the atmospheric pressure) and the exhaust pipe is connected to the test device at the same time. B2.2 Adjust the temperature in the drying oven to stabilize it within the range of 80 ± 5°C for 4 hours. B2.3. Close the north cut-off valve V1, open the stop valve V2, place the condenser tube outside the low-temperature tank, start the vacuum pump, and evacuate the system. B2.4 When the pressure in the system reaches 200Pa, place the condenser tube into a low-temperature tank whose temperature is kept below -70C, then gradually open the stop valve V, and the test lasts for more than 4 hours.
B2.54h later, when the pressure in the system does not exceed 2.5Pa, close the stop valves V and V2, then turn off the vacuum pump, take out the condenser tube from the cryogenic tank, and quickly seal its mouth. If the pressure in the system is higher than 2.5Pa, it means there is a leak in the compressor or test device, and the test is invalid.
Calculation of B3 residual moisture content
After the temperature of the condenser tube taken out of the system is balanced with the environment, wipe off the condensed water outside the tube, remove the tube seal, and read the water content in the tube , or weigh it on an analytical balance. The difference between its weight and the net weight of the condenser tube (weighed before use) is the residual moisture content of the compressor.
B4 test instrument accuracy
Analytical balance
572
0.5mg;
Thermocouple vacuum meterbzxZ.net
0.5 Pa||tt| |JB/T6915—93
Thermometer 1—A glass mercury thermometer with a minimum scale within 1.0°C. Additional notes:
This standard is proposed and administered by Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hefei General Machinery Research Institute. The main drafters of this standard: Fan Gaoding, Hu Jisun573
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