Air-conditioner and control method and device for compressor in air-conditioner

Abstract

The invention discloses a control method and device for a compressor in an air-conditioner and the air-conditioner. The method includes the following steps that in the running process of the compressor, if a running stop command is received, the running current and the running frequency of the compressor are obtained; if the running frequency of the compressor is larger than a preset frequency threshold value, the running frequency of the compressor is decreased according to a preset frequency decreasing rate, and the running current and / or the running frequency of the compressor are / is further judged in the frequency decreasing process of the compressor; and if it is judged that the running current of the compressor is smaller than or equal to a preset current threshold value and the state lasts a preset time, and / or the running frequency of the compressor is smaller than or equal to a preset frequency threshold value and the state lasts a preset time, the compressor is controlled to halt. By means of the method, the stress of compressor piping can be reduced effectively to a certain degree when the compressor halts, and therefore the service life of the compressor piping is prolonged.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for controlling a compressor in an air conditioner, a control device for a compressor in an air conditioner, and an air conditioner. Background technique [0002] Usually, the compressor in the inverter air conditioner will stop running directly when it receives a shutdown command. However, when the load of the system is relatively large or the operating frequency of the compressor is relatively high, if the compressor is suddenly controlled to stop running, it will be due to the sudden change of the system pressure, flow rate and flow, and the rotary inertia of the compressor motor and rotor. The compressor and the compressor piping shake violently. Especially for a single-rotor compressor with a large displacement, the larger the displacement, the greater the moment of inertia, the greater the impact of the fluid, and the more severe the vibration of the comp...

AI Technical Summary

Problems solved by technology

However, when the load of the system is relatively large or the operating frequency of the compressor is relatively high, if the compressor is suddenly controlled to stop running, it will be due to the sudden change of the system pressure, flow rate and flow, and the rotary inertia of the compressor motor and rotor. The compressor and the compressor piping shake violently

Especially for a single-rotor compressor with a large displacement, the larger the displacement, the greater the moment of inertia, the greater the impact of the fluid, and the more severe the vibration of the compressor and the compressor piping. It is easy to cause the stress of the compressor piping to exceed the standard, which will affect the service life of the compressor piping, and even crack or break the pipe.

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