Variable frequency centrifuge and control method of hot gas bypass valve in variable frequency centrifuge

Abstract

The invention discloses a variable frequency centrifuge and a control method of a hot gas bypass valve in the variable frequency centrifuge. The variable frequency centrifuge includes a compressor, and the hot gas bypass valve is disposed between an air suction pipe and an air exhaust pipe of the compressor. The method comprises the following steps of when the variable frequency centrifuge is in an operating state, obtaining a guide vane opening degree, an operating pressure ratio and the upper limit of the operating frequency of the compressor, wherein the operating pressure ratio is a ratioof an air exhaust absolute pressure value to an air suction absolute pressure value of the compressor; calculating the critical frequency of the variable frequency centrifuge according to the guide vane opening degree and the operating pressure ratio; controlling the opening degree of the hot gas bypass valve according to the critical frequency and the upper limit of the operating frequency. By controlling the opening degree of the hot gas bypass valve, the variable frequency centrifuge can safely operate with a small load under high ambient temperature and large pressure ratio, and at the same time, the compressor surging phenomenon does not occur under small load operation, so that the operation reliability of the variable frequency centrifuge is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling a hot gas bypass valve in a frequency conversion centrifuge, a non-temporary computer-readable storage medium, and a frequency conversion centrifuge. Background technique [0002] The frequency conversion centrifuge on the market before, when the ambient temperature is high, due to the operating characteristics of the centrifuge, it cannot operate safely under a small load. The main reason is that when the ambient temperature is high, the operating pressure ratio of the frequency conversion centrifuge (absolute exhaust pressure of the compressor / absolute suction pressure of the compressor) is relatively large. will cause damage to the impeller. Contents of the invention [0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the first object of the present in...

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Problems solved by technology

[0002] The frequency conversion centrifuge on the market before, when the ambient temperature is high, due to the operating characteristics of the centrifuge, it cannot operate safely under a small load

The main reason is that when the ambient temperature is high, the operating pressure ratio of the frequency conversion centrifuge (absolute exhaust pressure of the compressor / absolute suction pressure of the compressor) is relatively large. damage to the impeller

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