Oil eliminator auxiliary device of air conditioning system and control method thereof

Abstract

The invention relates to an auxiliary device of an oil separator in an air-conditioning system and a control method for the auxiliary device, which comprises a compressor, an oil separator and a return capillary. A pipe branch is in parallel provided with the return capillary between an oil outlet of the oil separator on exhausting side of the compressor and an air suction pipe of the compressor. A solenoid valve is connected in series on the pipe branch. The solenoid valve and an unloading valve of the air-conditioning system are merged into a whole, and oil unloading or return is carried out through controlling the solenoid valve respectively by the program. The control method for the auxiliary device of the oil separator is composed of selecting the return capillary and controlling opening period and duration of the solenoid valve. The invention has the advantages of effectively solving contradiction between normal oil return of the compressor assured by frequency conversion or variable capacity air-conditioning system and realizing high EER / COP and good cooling or heating, the unloading valve and the solenoid valve being merged into a whole, oil return of the compressor being optimized and cost of the system being not increased.

Description

technical field [0001] The present invention relates to an air conditioning system, in particular to an auxiliary oil return device for an oil separator of a variable frequency or variable capacity compressor in the air conditioning system and a method for controlling the oil return of the compressor Background technique [0002] The lubricating oil in the air conditioner compressor is very important to the normal operation of the compressor. At any time when the air conditioner is running, it is necessary to ensure that there is sufficient lubricating oil in the compressor. [0003] When the air conditioner unit is running, the lubricating oil in the compressor will be brought to the indoor units and piping along with the circulation of the refrigerant. If the taken away compressor lubricating oil cannot return to the compressor in time, the There will be less and less lubricating oil in the compressor, and the moving contact parts such as bearings and volutes in the compre...

AI Technical Summary

Problems solved by technology

[0005] The air conditioning system that uses an oil separator plus an oil return capillary returns the lubricating oil separated by the oil separator back to the compressor through the oil return capillary. If a little water or foreign matter enters the unit during installation and maintenance, the oil return capillary will be easily contaminated by foreign matter. Blockage or ice blockage occurs, at this time the compressor lubricating oil cannot return to the compressor normally, and the compressor will be damaged due to lack of oil operation after a long time

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