Control method and device and air conditioner

Abstract

The embodiment of the invention discloses a control method and device and an air conditioner. A first pressure value of an exhaust opening of a compressor and a second pressure value of an air inlet are detected at the same time, the first pressure value is converted into a corresponding first condensation temperature value, namely, actual condensation temperature, the second pressure value is converted into a corresponding evaporation temperature value, and the maximum condensation temperature value corresponding the evaporation temperature value is obtained. When the first condensation temperature value is larger than or equal to the maximum condensation temperature value, actual pressure of the exhaust opening of the compressor exceeds a high pressure boundary value within the rated pressure range, the compressor is immediately controlled to be shut down, shutdown protection is immediately carried out on the compressor once the actual pressure of the exhaust opening exceeds the high pressure boundary value within the rated pressure range, and reliability for carrying out shutdown protection on the compressor is improved.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, more specifically, to a control method, device and air conditioner. Background technique [0002] The compressor is an important component of the refrigeration system in the air conditioner. In order to ensure the normal operation of the air conditioner, the operating pressure of the compressor must not exceed its rated pressure range, otherwise it will cause an unrecoverable failure of the compressor. When the operating pressure exceeds the rated pressure range, controlling the shutdown of the compressor to prevent compressor failure has become an urgent problem to be solved. [0003] At present, in order to prevent compressor failure caused by the pressure at the discharge port of the compressor exceeding the high-pressure boundary value of the rated pressure range, the more commonly used method of controlling the shutdown of the compressor is to detect the pressure of the disc...

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Problems solved by technology

Then, if a certain fixed pressure value is still used for shutdown protection of the compressor, there will be some working conditions where the fixed pressure value adopted is greater than the actual high pressure boundary value, and the pressure at the discharge port of the compressor is greater than the actual When the high-pressure boundary value does not reach the fixed pressure value adopted, the compressor cannot be shut down in time for protection, or the fixed pressure value adopted is lower than the actual high-pressure boundary value, and the pressure at the exhaust port of the compressor is lower than the actual The high pressure boundary value is higher than the fixed pressure value adopted, and the compressor is shut down for protection. In the case of frequent protection, the reliability of shutting down the compressor for protection is low

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