The swash plate compressor is a small compressor and is the core component of the automotive air conditioning refrigeration system. The two-stage compression of the automobile air conditioner is mainly the steam coming out of the evaporator, compressed by the low pressure to the intermediate pressure, cooled in the intercooler to the temperature of the saturated vapor pressure of the pressure, and then compressed under high pressure to the high pressure gas, into the air conditioner. Condenser. The swash plate compressor has the advantages of stable operation, good balance, high speed, small volume, large cooling capacity and low noise. But can it reduce the piston force and reduce the exhaust temperature to save power consumption through the staged compression design? The graded compression design is applied to the design of the swash plate compressor to maximize the performance of the swash plate compressor and is worthy of further study.

For example, an automobile air conditioner (three-row six-cylinder swash plate compressor) with a displacement of V=1m3/min (intake pressure, = K1 exhaust pressure household 2=§<108) is used as an example to perform two-stage compression (4 A class I cylinder with 2 stages of cylinders and single stage compression, comparing the performance difference from the swash plate force and cooling power consumption.

1 Force calculation of the swash plate The stress condition of the single piston of the bookmark2 swash plate compressor is as shown.

The piston force of each column of cylinders is FP=F+F+Ff. If the lubrication is good, the reciprocating friction force of the cylinder is Ff=0. In order to better compare the piston force of single-stage and two-stage compression, the stroke of the piston is taken in two cases. S=0.03m is equal (the swashplate inclination angle T= is the rotation angle of the swash plate at any time, mn is the expansion index and the compression compression index, then the reciprocating inertial force of the piston is the expansion force Fa, the gas pressure household = sound; the intake air Process, this process is the equal pressure process of the sound, until 0 = 7!; compression process, household = this process is the isostatic process of p = p, until 0 = 2c.

The law that the gas force in both cases is 0<0 is calculated as shown.

Since the cylinders are symmetrically distributed and double-acting, in a worker 2 until the household = household 1; exhaust process, fund project: Hubei Provincial Department of Education Key Discipline Research Project Funding (2004D006) for the cycle, the piston force is about 0-tt center symmetry. It can be seen from ~3 that the maximum external force of the two-stage compression swash plate is much smaller than that of the single-stage compression, and the force of the swash plate main shaft of the grading design is relatively uniform, and the single-stage compression swash plate main shaft is mainly subjected to pressure. The two-stage compression can reduce the force of the swash plate main shaft, reduce the vibration during the rotation of the swash plate main shaft, enhance the smoothness of the compressor operation, reduce the noise, and prolong the life of the compressor.

Pressure; K is the adiabatic index; Zc is the superheated gas compression factor.

According to the pressure and temperature of the corresponding working fluid, check the thermal property table of R134a to get 2, 夂=1.11, B=0.992 9, the exhaust temperature from formula (2) is 277K, slightly higher than the intermediate pressure household = 3.13< The temperature of the 105Pa saturated gas is a superheated gas and no liquid will appear. In view of the above reasons, in the process of two-stage compression, the intermediate process does not require cooling and can directly enter high-pressure compression. The two-stage refrigeration cycle of the swash plate compressor and the primary refrigeration cycle pressure-焓31 are as shown.

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Thermal cycle process.

He(3)a two-stage refrigeration. Low-voltage unit theoretical power consumption: WD=h2-h1(4) High-voltage unit theoretical power consumption: WH=h4-h3(5) Total power consumption: wi=WD+WH(6)b. Single-stage cooling. Unit theoretical power consumption: wi=h4.-h1(7) According to the pressure and temperature of the corresponding working fluid, the R134a thermal property table can be obtained by 2:251.95k/kg, and the compression process is similarly regarded as adiabatic compression. The gas is compressed, the pressure is increased, the temperature is raised, and gas liquefaction does not occur during the compression process. As long as the liquid does not appear in the gas cooling after the low-stage compression, it is ensured that wet compression does not occur during the entire compression process. According to the refrigerant exhaust temperature calculation formula: a. The swash plate compressor two-stage compression cylinder diameter and gas pressure decrease to reduce the force of the piston, reduce the spindle vibration of the compressor, so that the compressor has better Power performance, using a two-stage compression design is better than single-stage compression.

b. The staged compression involves the cooling of the gas between the stages, so the structural design is more complicated, the quality will increase, and the volume will increase. For the case of small compression ratio and low exhaust gas temperature, it is recommended not to use the staged compression design.

c. For the exhaust gas temperature limit strict and power-saving working conditions, the two-stage compression can reduce the exhaust gas temperature, and the two-stage design can reduce the cylinder diameter, make the structure more compact, the resistance is relatively small, from the perspective of saving power Two-stage compression can also be used.

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