Four-way valve reversing monitoring method and device, and air conditioning system

Abstract

The invention discloses a four-way valve reversing monitoring method and device, and an air conditioning system. The monitoring method comprises the steps of controlling the reversing of a four-way valve and monitoring mode conversion signals of an air conditioning unit in real time when the refrigeration mode or heating mode of an air conditioning unit is switched; acquiring the pressure difference between an air outlet and an air inlet of a frequency conversion compressor when the mode conversion signals are detected; and changing the frequency of the frequency conversion compressor and regulating the pressure difference, and judging whether the reversing of the four-way valve succeeds or not through comparison between the pressure difference detected in this time and the pressure difference detected in the last time. According to the monitoring method, through real-time control in the reversing process of the four-way valve, real-time regulation of the operating frequency of the compressor is achieved through a unit according to the reversing time and the reversing pressure difference of the four-way valve, so that the pressure difference change of the air conditioning unit is controlled effectively, and the reversing reliability of the four-way reversing valve is ensured effectively.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a four-way valve reversing monitoring method, monitoring device and air conditioning system. Background technique [0002] The four-way valve is the core component of the heat pump unit. It is a key component to realize the cooling / heating function, and it is also a key component that can improve the comfort of users in the case of heating. Therefore, the reversing reliability of the four-way valve directly affects the unit. operating status. [0003] According to statistics, in recent years, the after-sales failure rate of four-way valves has remained high, and the failure rate of four-way valves for one-year and two-year machines has always been among the top four. The faults of the four-way valve are manifested in the form of air leakage, liquid hammer, non-reversing, and jamming. Usually, the reversing fault of the four-way valve has the characteristics of poor repr...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a four-way valve reversing monitoring method, monitoring device and air-conditioning system. Reliable technical problem, on the other hand, to solve the technical problem that the air conditioner cannot control the outlet air temperature after the reversing failure of the existing four-way valve, which affects the user's comfort

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