Structural Analysis of Electric Vehicle Air-Conditioning Heat Pump Scroll Compressor Tang Jingchun Zuo Chengji (School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009) The coefficient of performance is the thermodynamic optimization objective function, which determines the optimal supplemental pressure in the refrigerant circulation system. The geometric position and shape of the intermediate air inlet on the scroll of the scroll compressor is such that it has a quasi-double-stage compression function. The heat pump type electric scroll compressor developed by the company was installed in an electric vehicle air conditioning system, and the system was heated and cooled by the air enthalpy method.
According to the thermodynamic process equation, the relationship between the compressor discharge temperature Td(K) and the intake air temperature Ts(K) is: suction pressure and exhaust pressure, MPa. Relative to the refrigeration cycle, the suction of the compressor during the heating cycle The gas pressure becomes lower, so the pressure ratio Pd/long will increase, and an intermediate pressure initial value is obtained from 05, and the corresponding intermediate temperature initial value is obtained by using the thermodynamic property of the refrigerant; 2) the initial value at the intermediate temperature Select 5 to 6 intermediate temperature values ​​at intervals of 2C; 3) Perform 5~6 thermal calculations, and plot the calculation results into COPh-m curves. The intermediate temperature corresponding to the apex of the curve is the best. The intermediate temperature tmopt, the corresponding pressure is the optimal intermediate pressure. 2 The optimized geometry of the intermediate air inlet structure of the compressor can obtain the internal volume ratio of the intermediate compression chamber and the position angle of the intermediate air supply port is 0m, such as The test results of the public are required. From the experimental results data in Tables 1 and 2, it can be seen that the structure of the fixed scroll of the electric scroll compressor has a high coefficient of heating and cooling performance after being optimized. Thereby achieving product energy saving of.
4 Conclusion In order to meet the winter heating requirements of electric vehicle air conditioning systems, the design of the scroll of the scroll compressor has been modified, so that the compression heat process of the compressor to the refrigerant gas evolves from single-stage compression to quasi-double Level compression. The theoretical and experimental results show that under the nominal condition of the heat pump cycle of the automobile air conditioning system in winter, the heating coefficient of the compressor is the objective function of thermodynamic optimization, and there is a best supplemental pressure in the refrigerant circulation system. Correspondingly, the intermediate air inlet on the scroll of the scroll compressor has an optimum geometric position.
The heat pump type electric scroll compressor with optimized configuration of the fixed scroll has the heating and cooling capacity of the air conditioning system, which can meet the winter and summer comfort requirements of the 5-seater electric vehicle passengers.
The heat pump type electric scroll compressor with intermediate air supply reduces the exhaust temperature of the compressor and increases the mass flow rate of the refrigerant in the automobile air conditioning system during the heat pump cycle, thereby improving the heat of the heat pump cycle and the refrigeration cycle of the automobile air conditioning system. Economical, the purpose of energy saving is achieved.
This paper is open to the Key Laboratory of Clean Energy and Application of Power Machinery in Jiangsu Province.
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