Return oil control method for air conditioner

Abstract

The invention relates to the technical field of air conditioners, in particular to a return oil control method for an air conditioner, and is intended to solve the problem that an existing technical scheme to improve the return oil effect of a fixed frequency compressor is unable to basically solve the poor return oil issue. To this end, the return oil control method for the air conditioner comprises: calculating compression ratio E and / or suction vapor overheat delta T of a fixed frequency compressor; if the compression ratio E is less than minimum allowable compression ratio Emin and / or thesuction vapor overheat delta T is less than zero, controlling the air conditioner to enter a return oil mode. During operation of the fixed frequency compressor, when the compression ratio E is less than the minium allowable compression ratio Emin and / or the suction vapor overheat delta T is less zero, the air conditioner is controlled to enter the return oil mode; through the above control manner, the return oil control method for the air conditioner can provide improved return oil effect for the compressor, reduced failure rate for the compressor and extended life for the compressor.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner oil return control method. Background technique [0002] In the past two years, although inverter air conditioners have gradually emerged, for shopping malls, shops and other places that require high-power air conditioners, the unitary air conditioners using fixed frequency compressors (that is, fixed frequency air conditioners) have an incomparable price advantage, so still occupy the majority of the market share. According to the poor feedback of compressors in the market for many years, the proportion of fixed-frequency compressor failures caused by oil shortage ranks the top three in the proportion of fixed-frequency compressor failures. As a result, the oil return problem of the fixed-frequency compressor has become a problem that needs to be paid attention to and solved in the design of the fixed-frequency air-conditioning system. The existing ...

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Problems solved by technology

[0005] In order to solve the above problems in the prior art, that is, to solve the technical solution in the prior art to improve the oil return effect of the fixed-frequency compressor by limiting the length of the piping and the height difference between the inner and outer units, the oil return of the fixed-frequency compressor cannot be fundamentally solved. Bad problem, the present invention provides an air conditioner oil return control method, the air conditioner includes a fixed frequency compressor, characterized in that the control method includes:

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