Rail vehicle air conditioning unit temperature resistance evaluation method
A technology for air conditioning units and rail vehicles, which is applied in the field of rail vehicle air conditioning systems, and can solve problems such as safety valve discharge and refrigeration system elevation.
Active Publication Date: 2021-02-23
石家庄国祥运输设备有限公司
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Problems solved by technology
[0002] The refrigeration system cycle of carbon dioxide air conditioners for rail vehicles is designed as a transcritical cycle, which is installed on the top or bottom of rail vehicles, especially for carbon dioxide air conditioners installed on the roof. Influence, when the air conditioner does not work for a long time, the pressure in the refrigeration system will rise with the temperature rise. After the critical temperature of carbon dioxide is exceeded, all the carbon dioxide in the system will be converted into gas, and the pressure in the refrigeration system will rise with the rise of the ambient temperature. Safety valve release risk
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[0010] Referring to the accompanying drawings, the temperature resistance evaluation method of the present invention is based on an air conditioning unit using carbon dioxide as a refrigerant. The rail vehicle air-conditioning unit includes an air-conditioning box body having an outdoor cavity 11 and an indoor cavity 12 and a refrigerant circulation loop system arranged in the air-conditioning box body. The refrigerant circuit system includes a compressor 2, an outdoor heat exchanger 4 and a gas-liquid separator 6 arranged in the outdoor chamber 11, an indoor heat exchanger 9 arranged in the indoor chamber 12, a regenerator 7 and an electronic expansion valve 8, and Matching piping. An outdoor fan 5 is arranged in the outdoor chamber 11 , and an indoor fan 10 is arranged in the indoor chamber 12 . The refrigerant in the refrigerant circuit system is carbon dioxide. Compressor 11 is a horizontal inverter compressor.
[0011] Pressure sensor, pressure switch, low-pressure rel...
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The invention discloses a rail vehicle air conditioning unit temperature resistance evaluation method. The method comprises the following steps that: A, an air conditioning unit and a nitrogen cylinder are placed at the same environment temperature, and the environment temperature value at the moment is recorded; B, all valves in the air conditioning unit are opened, and then the air conditioningunit is vacuumized; C, nitrogen is continuously injected into the air conditioning unit in sequence in a graded mode, the weight of the nitrogen cylinder after nitrogen filling of each grade and the corresponding high-pressure side pressure value and low-pressure side pressure value of the air conditioning unit are recorded, and the volume of a refrigerating system of the air conditioning unit iscalculated; step D, according to density and a discharge pressure design value of the system, the theoretically tolerated highest environment temperature of the air conditioning unit is obtained; andE, the theoretically tolerated highest environment temperature of the air conditioning unit and the maximum tolerated environment temperature of the air conditioning unit are compared with each other.Since the air conditioning unit is verified before being delivered, it is guaranteed that the delivered product does not have the refrigerant discharge fault caused by standing storage in the highesttemperature environment of vehicle operation.
Description
technical field [0001] The invention belongs to the technical field of rail vehicle air-conditioning systems, and in particular relates to a method for evaluating the temperature resistance of a rail vehicle air-conditioning unit based on carbon dioxide as a refrigerant. Background technique [0002] The refrigeration system cycle of carbon dioxide air conditioners for rail vehicles is designed as a transcritical cycle, which is installed on the top or bottom of rail vehicles, especially for carbon dioxide air conditioners installed on the roof. Influence, when the air conditioner does not work for a long time, the pressure in the refrigeration system will rise with the temperature rise. After the critical temperature of carbon dioxide is exceeded, all the carbon dioxide in the system will be converted into gas, and the pressure in the refrigeration system will rise with the rise of the ambient temperature. Safety valve release risk. [0003] The safety of rail vehicles is ...
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IPC IPC(8): G01M99/00
CPCG01M99/002G01M99/005Y02T30/00
Inventor 孙亮杨玉茹
Owner 石家庄国祥运输设备有限公司