Control Method of Electronic Expansion Valve for Refrigerator

Abstract

The invention discloses a control method for an electronic expansion valve for a refrigerator. The control method comprises the following steps of: starting the refrigerator and presetting parameters; keeping maximum opening of the electronic expansion valve for T1; gradually reducing opening of the electronic expansion valve until minimum opening at an existing environment temperature, and keeping the minimum opening for T2; separately performing operations according to the size of i; after stopping the refrigerator, completely closing the electronic expansion valve; and assigning a value of i+1 to i, and returning to step (2). Compared with the prior art, the control method disclosed by the invention has the advantages that: the control method is simple, degree of superheat of an evaporator or operation parameters of a compressor do not needed to be acquired, a self-regulating function of the electronic expansion valve is realized according to turn-on time, power consumption of the refrigerator is reduced, and service lives of system elements are favorably prolonged.

Description

technical field [0001] The invention relates to a control method for an electronic expansion valve used in a refrigerator. Background technique [0002] With the development of refrigerators, the compressor has developed from fixed frequency to variable frequency, and the fan has developed from fixed speed to variable speed. According to the different ambient temperature and heat load of the refrigerator, the power consumption and cooling capacity of the refrigerator are constantly changing to match the Best current performance. [0003] However, the flow rate of the capillary tube in the refrigerator is a fixed value. When the refrigerant flow rate in the system changes, such as the compressor speed flow adjustment, or in the process of lowering the evaporation temperature, the flow rate cannot be changed, and the actual cooling efficiency of the system will be compromised. The electronic expansion valve with adjustable refrigerant flow can solve this problem very well, re...

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Problems solved by technology

[0004] Most of the electronic expansion valve adjustment methods on the market are adjusted according to the temperature difference between the inlet and outlet of the evaporator, that is, the degree of superheat of the refrigerant. This method can make full use of the cooling capacity of the refrigerant, but this method needs to add a sensor at the outlet of the evaporator. If the sensor fails, the electronic expansion valve will not work. Moreover, because the evaporator of the refrigerator is smaller in size and cooling capacity than other refrigeration equipment such as air conditioners, the superheat of the refrigerant is not obvious, or even has no superheat. The adjustment of flow parts may not necessarily achieve the ideal superheat, so this method is not suitable for use on refrigerators

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