Air conditioner automatic liquid collection control method, control system and air conditioner

Abstract

The invention relates to an air conditioner automatic liquid collection control method, control system and air conditioner, wherein the control method includes: when receiving a liquid collection order, judging whether the operation mode of the air conditioner is cooling mode; if yes, closing the liquid connection tube, detecting and judging whether the pressure in the liquid connecting pipe is greater than the first preset pressure value and lasts for the first preset time t1; if yes, judging whether the pressure in the gas connecting pipe is less than the second preset pressure value; if yes, then An automatic liquid collection command is issued to perform automatic liquid collection; wherein, the first preset pressure value is greater than the second preset pressure value. The present invention judges whether to automatically collect liquid by comparing the size relationship between the liquid connecting pipe, the gas connecting pipe and the preset pressure value, and prevents the air conditioner from misjudging under other operating environments to automatically open the liquid collecting, and does not need to start the liquid collecting manually The judgment of the timing realizes the automatic guidance and judgment of liquid collection and prevents the compressor from being damaged.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner automatic liquid collection control method, a control system and an air conditioner. Background technique [0002] When the air conditioning system breaks down and needs to be overhauled or repaired, it is necessary to collect liquid from the air conditioner. [0003] In the prior art, the air conditioner is usually turned on in the cooling operation mode, and the shut-off valve in the liquid connection pipe between the outdoor heat exchanger and the indoor heat exchanger is manually closed to prevent the refrigerant from flowing from the outdoor heat exchanger to the indoor heat exchanger. After the compressor runs for a period of time, the operator feels the outlet air temperature of the outdoor unit. For example, when the outlet air temperature of many outdoor units is close to the outdoor ambient temperature, it is considered that the refrigerant i...

AI Technical Summary

Problems solved by technology

This kind of refrigerant recovery control method also has the following disadvantages: whether the refrigerant recovery depends entirely on the experience of the operator, if the recovery time is too short, the refrigerant may not be fully recovered, and if the recovery time is too long, the compressor may be damaged due to long-term no-load. The internal parts of the compressor reduce its service life; relying on the temperature difference perceived by the human body to judge the temperature of the air outlet and the environment can easily lead to misjudgment, and there are obvious differences due to individual differences, which will cause incomplete liquid collection in the air conditioner, and some refrigerants will remain in the air conditioner. If the indoor heat exchanger and the gas connecting pipe are not recovered, the liquid volume in the air conditioning unit will be inaccurate. If the liquid is refilled, it will cause pollution and other adverse effects on the environment.

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