Refrigerating system, air conditioner and control method of refrigerating system

Abstract

The invention provides a refrigerating system, an air conditioner and a control method of the refrigerating system.The refrigerating system comprises an indoor unit, an outdoor unit and a functional component, the arrangement position of the outdoor unit is higher than that of the indoor unit, the indoor unit comprises a compressor, an evaporator and a first throttling device, and the outdoor unit comprises a condenser; the functional assembly comprises an oil separator, a liquid storage device, a first branch and a three-way valve, the first end of the three-way valve communicates with the interior of the oil separator, the second end of the three-way valve communicates with the condenser, the third end of the three-way valve communicates with the interior of the liquid storage device through the first branch, and the second end and the third end can communicate when the compressor is shut down; and therefore, the refrigerant can enter the liquid storage device from the condenser through the first branch. When the compressor is shut down, the refrigerant in the condenser can be guided into the liquid storage device through the first branch, the situation that the refrigerant flows back to the exhaust port of the compressor when the compressor is shut down is effectively prevented, and the problem that the liquid refrigerant flows back is solved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a refrigeration system, an air conditioner and a control method for the refrigeration system. Background technique [0002] The engineering design and installation of precision computer room air conditioners may be installed in the form of high drop and long connecting pipes due to architectural design and site restrictions. Usually, the outdoor unit is higher than the indoor unit, which is called a positive drop, and it is called a negative drop anyway. Because the precision computer room air conditioner operates in the cooling mode all the year round, its compressor is generally designed to be placed in the indoor unit, which is different from the general comfortable civil air conditioner. [0003] There are usually the following problems in the air-conditioning project of the computer room with the long connection pipe with positive drop: 1) The pipeline is too long, wh...

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Problems solved by technology

[0003] There are usually the following problems in the computer room air-conditioning project with long connecting pipes with positive drop: 1) Too long pipes cause the flow rate of refrigerant to drop, and oil return is difficult, resulting in compressor oil shortage and wear or motor burnout; 2) Installation with positive drop may cause liquid refrigeration If the refrigerant returns to the exhaust pipe of the compressor or even enters the exhaust port of the compressor, the compressor may be damaged or high pressure protection may occur when the next startup is started; It will cause unstable operation of the system, which will reduce the service life of the compressor in the long run; 4) The pipeline loss of the high drop and long connecting pipe is too large, and the liquid refrigerant will have a greater impact on the system components when the valve is suddenly closed (similar to the phenomenon of water hammer ), and even affect the normal operation of the electronic expansion valve; 5) The liquid refrigerant in front of the expansion valve may flash due to the excessive pressure drop along the long pipeline, resulting in a decrease in the pressure in front of the valve and a decrease in the subcooling degree. Affect the stability of unit operation

[0004] None of the existing research and patent solutions can solve all the above problems, and the actual air-conditioning project of the precision computer room with high drop and long connecting pipe needs to ensure that these possible problems can be solved, otherwise the project will have hidden quality problems, prone to failure and even the entire project. The refrigeration system crashes and cannot operate, so it is necessary to design a system solution to prevent or solve these problems

[0005] Since the precision machine room air conditioner in the prior art has technical problems such as the liquid refrigerant backflowing to the exhaust end of the compressor, the present invention researches and designs a refrigeration system, an air conditioner and a control method for the refrigeration system

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