Gas supply and enthalpy increase system for frequency conversion compressor with normally open air supply port, its control method, and computer-readable storage medium

Abstract

The invention relates to a system for replenishing air and increasing enthalpy of a frequency conversion compressor with a normally open air supply port, a control method thereof, and a computer-readable storage medium. The method includes: starting up the compressor and controlling the compressor to run at the oil return frequency F1 for 1 minute, then directly increase the frequency to the target frequency Fx to run; after the compressor is started, control the electronic expansion valve to maintain tieme at the initial opening degree EEVini for 3 minutes to avoid low-pressure frosting, and then Turn down to the target opening degree EEVtarget within time4 minutes, and then continue to adjust the opening degree of the electronic expansion valve to keep the specific current gas temperature parameter equal to its target value; control the compressor to run at the target frequency for time2 minutes and then increase or decrease the frequency according to the load Adjust until the current load is equal to the set minimum operating load A, and update the minimum operating frequency allowed for the compressor to operate in real time according to the opening of the electronic expansion valve and the degree of gas superheat during the adjustment process. If the compressor is reduced to the minimum operating frequency The frequency then quits the frequency-up and down-frequency adjustment and keeps running at the current operating frequency of the compressor.

Description

technical field

[0001] The invention relates to a system for replenishing air and increasing enthalpy of a frequency conversion compressor with a normally open air supply port, a control method thereof, and a computer-readable storage medium. Background technique

[0002] For the air supply and enthalpy increasing system of the frequency conversion compressor, if the air supply port is kept open, when the compressor is running at low frequency, it is easy to enter the liquid from the air supply port, causing the system to run with liquid, causing reliability risks.

[0003] In order to solve the problem of liquid-filled operation of the above-mentioned system, the existing technology is to set one or several fixed minimum operating frequencies, and prohibit the compressor from operating below the minimum operating frequency, but the system has various working conditions, and the fixed value is used to limit It is difficult to meet the needs of all working conditions, resulti...

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