Fault detection method and device for supercooling valve in supercooling device

Abstract

The invention discloses a fault detection method and device for a supercooling valve in a supercooling device, and the method comprises the steps: detecting a main inflowing temperature value and a main outflowing temperature value of a supercooling heat exchanger at preset time intervals till the number of detection times reaches a preset number, and juding whether there is an abnormality happening to the supercooling valve or not according to the corresponding main inflowing and outflowing temperature values at each time; controlling the supercooling valve to be switched to a first switching degree when the abnormality happens to the supercooling valve, obtaining a first temperature difference value, controlling the supercooling valve to be switched to a second switching degree, and obtaining a second temperature difference value; judging whether the difference between the first temperature difference value and the second temperature difference value is less than or equal to a preset threshold value or not; and judging that a fault happens to the supercooling valve when the difference between the first temperature difference value and the second temperature difference value is less than or equal to the preset threshold value. The method provided by the embodiment of the invention can detect a plurality of types of faults of the supercooling valves, improves the satisfaction degree of a user, and protects an air conditioner from being further damaged.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a fault detection method and device for a supercooling valve in a supercooling device. Background technique [0002] In the field of central air conditioning, multi-unit units are more and more popular in the market due to their advantages of wide application range and many application occasions. But it is well known that the capacity loss of multi-connected units is large in the case of long piping. In order to recover the capacity loss caused by the flashing of the refrigerant in the long piping, and to eliminate the noise problem caused by the two-phase flow, more and more subcooling is used in the industry to solve the above problems. However, at present, there is a lack of effective fault detection, prediction, and alarm methods for the subcooling valve (an electronic expansion valve) commonly used in subcooling devices. [0003] Although some electronic expansion...

AI Technical Summary

Problems solved by technology

This method can only detect the circuit fault of the stepping motor of the electronic expansion valve, and other faults (such as valve body out of step, stuck, etc.) cannot be detected, let alone optimize and protect the system through proper adjustment of the valve body, resulting in poor user experience

As for judging the failure of the subcooling valve based on the actual situation of the subcooling device, the industry is still in a blank state.

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