Four-way valve fault detection method and device

Abstract

The invention provides a four-way valve fault detection method and device. When receiving the four-way valve fault detection notification, in order to ensure the detection accuracy, it is necessary to control the internal fan and the external fan in the unit to maintain a fixed speed to prevent the speed The change affects the temperature change. By controlling the frequency of the compressor in the unit to change from the first frequency to the second frequency at a constant speed, during the frequency change process, the coil temperature value in the unit is collected every set time period. Several coil temperature values ​​calculate the corresponding temperature change trend value of the coil, and use the current working mode of the unit and the temperature change trend value to determine whether the four-way valve is faulty. This solution only needs to measure the temperature of one coil without measuring The temperature of other components is easy to operate, and by controlling the constant speed change of the compressor frequency and the fixed speed of the internal fan and the external fan, the influence of external factors on the temperature change of the coil can be guaranteed, and the accuracy of four-way valve fault detection can be 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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