Refrigeration system, air conditioner and control method for air conditioner

Abstract

The invention provides a refrigerating system, an air conditioner and a control method of the air conditioner. The refrigerating system comprises a compressor and an air-liquid separator. The air-liquid separator is provided with an air feeding pipe and air discharging pipes, the air feeding end of the first air discharging pipe is arranged inside the air-liquid separator, and the air dischargingend of the first air discharging pipe is connected to an air return opening of the compressor. The air feeding end of the second air discharging pipe stretches into the air-liquid separator and is arranged at the top of the air-liquid separator, and the air discharging end of the second air discharging pipe is connected to the air returning opening of the compressor. The first air discharging pipeis provided with a first control valve, and the second air discharging pipe is provided with a second control valve. The air conditioner and the control method of the air conditioner are both based on the refrigerating system. By means of the refrigerating system, the air conditioner and the control method of the air conditioner, the liquid impact problem in the start process of the compressor, the liquid impact problem in the steady operation process and the oil return problem in the operation process are effectively solved, the function of adjusting the air sucking superheat degree of the compressor is achieved, therefore, the safety coefficient of the compressor is improved, and the service life of the compressor is prolonged.

Description

technical field [0001] The invention belongs to the refrigeration field, in particular to a refrigeration system of an air conditioner. Background technique [0002] At present, one of the four major components of the refrigeration system is the compressor. The compressor is also called the heart of the refrigeration system. The reliability of the compressor is directly related to the reliability of the entire system. The service life of the system is directly related, and the two major killers of compressor damage are poor oil return and liquid hammer. [0003] Aiming at the liquid hammer problem, the prior art solves the problem by installing a gas-liquid separator at the air inlet of the compressor. Such as figure 1 As shown, a gas-liquid separator 20 is installed before the suction port of the compressor 10, and the outside of the gas-liquid separator 20 is a cylindrical tank with two pipes (an inlet pipe 30, A gas outlet pipe), from the internal cross-sectional view ...

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Problems solved by technology

[0004] However, after the system runs for a long time, more and more oil droplets will gather at the bottom of the existing gas-liquid separator 20, and the lubricating oil cannot return to the compressor. The dry friction of the moving parts will generate a lot of heat, which will seriously affect the service life of the compressor. Therefore, the bottom of the U-shaped tube of the gas-liquid separator is always provided with an oil return hole 203. The purpose is to ensure that the lubricating oil can Continuously return to the compressor from the oil return hole

However, when the refrigeration system is shut down, there will be refrigerant liquid stored in the gas-liquid separator, and the oil return hole at the bottom of the U-shaped tube will be immersed in the refrigerant liquid, so there will be refrigerant liquid in the U-shaped tube. After the compressor starts up again, the refrigerant liquid will be sucked into the compressor causing a liquid hammer accident

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