Fault detection method and device of air conditioner system

Abstract

The invention provides a fault detection method and device of an air conditioner system. The air conditioner system comprises a refrigeration system consisting of a compressor, a four-way valve, an indoor heat exchanger and an outdoor heat exchanger, and an electronic expansion valve for controlling the oil return amount of the compressor. The fault detection method comprises the steps of detecting whether the four-way valve executes a reversing operation or not in real time; after it is detected that four-way valve executes the reversing operation, if the running duration of the compressor reaches a first preset duration, detecting pressure values of the two ends of the expansion valve; judging whether the pressure values of the two ends of the electronic expansion valve are greater than or equal to a preset pressure value or not; and if so, judging that the air conditioner system runs normally. By adopting the technical scheme provided by the invention, the problem of greasy blockage in the expansion valve before and after defrosting of the air conditioner can be detected in time, the situation that the capacity and power of the air conditioner is decreased due to idle operation of the compressor is avoided, the service life of the compressor is guaranteed, and the use comfort of the new refrigerant air conditioner is also improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a fault detection method for an air conditioner system and a fault detection device for an air conditioner system. Background technique [0002] At present, in the field of air-conditioning and refrigeration technology, most of the R410a refrigerants are used to replace the traditional R22 refrigerants. However, due to the high GWP value (Global Warming Potential) of R410a refrigerants, the global warming effect is becoming increasingly serious and the world Under the background that countries pay more and more attention to global climate change, it will also be gradually eliminated. Therefore, at present, it is more focused on the research of low-GWP refrigerants represented by R32 and R290. At the same time, the corresponding compressor research and development is also in progress. Among them, compressor lubricating oil, as an indispensable part of the air-conditionin...

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Problems solved by technology

[0004] However, the viscosity of ordinary mineral lubricating oil will increase sharply at low temperatures, especially in cooling and heating inverters. When the defrosting ends and the four-way valve changes direction, the ultra-low temperature refrigerant and lubricating oil in the evaporator need to enter the condensation through the electronic expansion valve. device

However, for R290 refrigerant, due to safety considerations, the charging amount of R290 refrigerant is small, so the system pressure is also small, so it is easy to cause the relatively viscous lubricating oil to block the electronic expansion valve with a normal opening, resulting in R290 Refrigerant cannot participate in the cycle, which will cause the compressor to run idly, the capacity and power will decrease, the system will lack oil and fluorine, and the motor of the compressor will overheat after long-term operation, which will not only affect the user's experience, but also greatly reduce the compressor and system. service life

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