Control method of refrigeration system and control method of air conditioner

Abstract

The invention provides a control method of a refrigeration system. The refrigeration system comprises a condenser, an expansion valve, an evaporator and a compressor, which communicate with one another; and a refrigerant circulates in the refrigeration system. The control method of the refrigeration system comprises the steps of shutting down the compressor till next start, and enabling the expansion valve to perform self-cleaning, wherein the step of enabling the expansion valve to perform self-cleaning concretely includes the following steps: changing the opening degree of the expansion valve by a based on an original opening degree; S2, further changing the opening degree of the expansion valve by b based on S1; and S3, completing self-cleaning of the expansion valve, wherein a is a positive value and b is a negative value, or a is a negative value and b is a positive value. According to the control method, the opening degree of the expansion valve is unceasingly increased or reduced to make debris fall off the expansion valve, so that the phenomena that the expansion valve gets stuck due to the debris and cannot work in actual operation is avoided.

Description

technical field [0001] The invention provides a control method of a refrigeration system and a control method of an air conditioner. Background technique [0002] With the improvement of people's living standards, people have put forward more requirements for the cooling effect of air conditioners. Therefore, ordinary air conditioners can no longer meet people's needs, and frequency conversion air conditioners have emerged as the times require. Most inverter air conditioners use electronic expansion valves to regulate the flow of refrigerant. The electronic expansion valve is a precision control component, which can refine the refrigerant flow rate and precisely control the temperature. However, during the operation of the air conditioner, there are various impurities in the refrigerant circulation system of the refrigeration system, such as copper pipe debris, welding oxides, debris produced by mechanical friction of the compressor, etc., and this hard debris is in the ref...

AI Technical Summary

Problems solved by technology

However, during the operation of the air conditioner, there are various impurities in the refrigerant circulation system of the refrigeration system, such as copper pipe debris, welding oxides, debris produced by mechanical friction of the compressor, etc., and this hard debris is in the refrigerant. Continuous operation in the circulatory system will cause the electronic expansion valve to be stuck. Although the rotating magnetic field generated after the coil is energized will make the electronic expansion valve operate, in fact it cannot operate normally due to the debris being stuck.

And this will lead to problems such as frosting, poor effect, or even no cooling, no heating, and valve damage in the air conditioner.

[0003] In addition, in practical applications, it is impossible to directly detect whether there is debris in the electronic expansion valve or whether it is stuck. It can only be checked and replaced after the air conditioner is abnormal.

This causes great inconvenience during the use of the air conditioner. Therefore, it is necessary to design a control method for the refrigeration system, which is used to place the expansion valve stuck and ensure the normal operation of the refrigeration system and its air conditioner.