Pressure control system for frequency change compressor in frequency change air conditioner

Abstract

The pressure control system for the frequency conversion compressor in the frequency conversion air conditioner, the output end of the fixed speed compressor is connected to the high pressure switch through the first check valve, the output end of the frequency conversion compressor is connected to the high pressure switch through the oil separator and the second check valve in turn, and the high pressure switch Connect the a-side of the four-way valve, the b-side of the four-way valve is connected to the condenser, the condenser is connected to the electronic expansion valve and the third capillary, the electronic expansion valve and the third capillary are connected to the liquid storage tank, and the d-side of the four-way valve is connected to the fixed-speed compressor and the input end of the variable frequency compressor, the c-end of the four-way valve is connected to the evaporator and the liquid storage tank in turn, the c-end of the four-way valve is also connected to the first capillary and the electromagnetic valve for refrigeration in turn, and the other end of the electromagnetic valve for refrigeration is connected to the constant speed The compressor is connected to the input end of the variable frequency compressor, the d end of the four-way valve is connected to the second capillary and the solenoid valve for heating in turn, the solenoid valve for heating is connected to the b end of the four-way valve and one end of the electronic expansion valve, and the other two ends of the electronic expansion valve The terminals are respectively connected to the liquid storage tank and the condenser. The invention reduces the start and stop of the compressor and prolongs the service life.

Description

technical field

[0001] The invention relates to an air-conditioning refrigeration and heating system. In particular, it relates to a pressure control system for the variable frequency compressor in the variable frequency air conditioner which can control the variable frequency compressor. Background technique

[0002] The structure of the existing air-conditioning refrigeration and heating system is as follows: figure 1 As shown, it includes a fixed-speed compressor 1 and an inverter compressor 2, wherein the output end of the fixed-speed compressor 1 is connected to the high-pressure switch 6 through the first one-way valve 5a, and the output end of the inverter compressor 2 passes through the oil separator in turn 4 and the second one-way valve 5b are connected to the high pressure switch 6, the high pressure switch 6 is connected to the a end of the four-way valve 7, the b end of the four-way valve 7 is connected to the condenser 13, and the other end of the condenser 13...

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