Four-way valve fault detection method and device

Abstract

The invention provides a four-way valve fault detection method and device. The method comprises the steps that when a four-way valve fault detection notification is received, an inner fan and an outerfan in a unit are controlled to be maintained at a fixed rotating speed so as to guarantee the detection accuracy, and the influence of rotating speed change on temperature change is avoided; and thefrequency of a compressor in the unit is controlled to change from the first frequency to the second frequency at a constant speed, in the frequency change process, the temperature values of coil pipes in the unit are collected once every set time period, and the temperature change trend values corresponding to the coil pipes are calculated according to the obtained temperature values of the coilpipes. According to the scheme, only the temperature of one coil pipe needs to be measured, the temperature of other components does not need to be measured, operation is easy, and through controlling the constant-speed change of the frequency of the compressor and the fixed rotating speed of the inner fan and the outer fan, the influence of external factors on the temperature change of the coilpipes can be ensured, and the fault detection accuracy of the four-way valve is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a four-way valve fault detection method and device. Background technique [0002] Four-way valves exist in air conditioners, dehumidifiers, hot water units and other equipment, and are generally used to reverse the heat cycle of refrigerant in pipelines to achieve cooling or heating functions. The reversing of the four-way valve is to switch the flow direction of the refrigerant through the sliding of the middle slider. This kind of component that is reversing through the sliding of the slider will have a phenomenon of jamming during the reversing process. When the equipment fails, it is necessary to detect whether the four-way valve has failed. [0003] In the prior art, there are some methods for detecting four-way valve faults. For example, in the patent with the application number "201610871303.X" and the patent name "A Method and System for Detecting Air-conditioni...

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Problems solved by technology

The reversing of the four-way valve is to switch the flow direction of the refrigerant through the sliding of the middle slider. This kind of component that is reversing through the sliding of the slider will have a phenomenon of jamming during the reversing process.

[0003] In the prior art, there are some methods for detecting four-way valve faults. For example, in the patent with the application number "201610871303.X" and the patent name "A Method and System for Detecting Air-conditioning Faults", it is proposed to use the disc The difference between the detected temperature of the coil and the initial temperature is used to determine whether the four-way valve is faulty. In this method, the initial temperature of the coil is related to the ambient temperature, and the ambient temperature often changes. Therefore, the accuracy of the existing detection method is low.

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