One-drive-multiple cooling-heating air conditioner

Abstract

This invention relates to an air conditioner including a compressor, a four-way valve, a condenser, a first and second evaporators and a first and second electromagnetic valves, in which, the first evaporator is serial to the first electromagnetic valve to compose a first serial device, a second evaporator is serial to the second electromagnetic valve to make up of a second serial device, which is parallel to the first serial device to form a parallel device characterizing in also including heating and cooling capillaries, one to four single-way valves, the heating capillary is serial to the first single-way valve to make up of a third serial device, the cooling capillary is serial to the second single-way valve to constitute a fourth serial device, the third and fourth serial devices make up of a bridge loop device with the third and fourth single-way valve, which makes the trend of a refrigerant flowing in the evaporator the same either at the heating state or the cooling state and the outlet of the evaporator is always connected with the air entry of the compressor.

Description

technical field [0001] The invention relates to a one-drag multi-cooling and heating air conditioner. Background technique [0002] The indoor units of a one-to-many air conditioner are composed of two or more indoor units. When designing the system, a solenoid valve is often installed in front of the evaporator inlet of each indoor unit, which is switched on and off as needed to control the flow to a certain unit. The indoor unit supplies refrigerant. When the one-to-many air conditioner is in heating operation, the refrigerant flow direction is opposite to that in cooling operation. In actual use, it often happens that some indoor unit evaporators do not need to supply refrigerant. At this time, the inlet of the indoor unit evaporator The solenoid valve will be disconnected, and the high-temperature and high-pressure refrigerant (containing a certain amount of lubricating oil) from the compressor will partially accumulate in the evaporator of the indoor unit and cannot re...

AI Technical Summary

Problems solved by technology

When the one-to-many air conditioner is in heating operation, the refrigerant flow direction is opposite to that in cooling operation. In actual use, it often happens that some indoor unit evaporators do not need to supply refrigerant. At this time, the inlet of the indoor unit evaporator The solenoid valve will be disconnected, and the high-temperature and high-pressure refrigerant (containing a certain amount of lubricating oil) from the compressor will partially accumulate in the evaporator of the indoor unit and cannot return to the compressor through the condenser, which will cause the compressor to be damaged due to lack of lubricating oil. while damaged

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