Detection method and detection device for oil blockage of air conditioning system, and air-conditioner

Abstract

The invention provides a detection method for oil blockage of an air conditioning system, a detection device for oil blockage of an air conditioning system, and an air-conditioner, wherein a refrigerant used for the air conditioning system is a flammable refrigerant; the method comprises: judging whether the air conditioning system is in a preset working state; after determining that the air conditioning system is in the preset working state, acquiring a temperature parameter of the air conditioning system every first preset time; and determining whether oil blockage happens in the air conditioning system according to the temperature parameter. According to the technical solution, whether oil blockage happens in the air conditioning system using the flammable refrigerant can be determined immediately and effectively, and then a phenomenon of capacity attenuation of the air conditioning system due to oil blockage can be avoided, and therefore, the service life of a compressor and the service life of the air conditioning system can be guaranteed; meanwhile, the flexibility of use of the air conditioning system is improved and the experience of a user is enhanced.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for detecting oil plugging in an air conditioning system, a device for detecting oil plugging in an air conditioning system, and an air conditioner. Background technique [0002] At present, in the field of air-conditioning and refrigeration technology, most of the R410a refrigerants are used to replace R22 refrigerants, and its advantages are obviously reflected in inverter air conditioners. The global greenhouse effect is becoming more and more serious, and countries around the world are paying more and more attention to global climate change, and will be gradually eliminated. Therefore, at present, we are more focused on researching low-GWP refrigerants represented by R32 refrigerant and R290 refrigerant, especially for R290 refrigerant, which has almost no pollution. At the same time, the research and development of corresponding compressors is also in progr...

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Problems solved by technology

[0004] However, for the flammable refrigerant—R290 refrigerant, its viscosity will increase sharply at low temperatures, especially in cooling and heating inverters. The ultra-low temperature refrigerant and lubricating oil need to enter the condenser (outdoor heat exchanger) through a throttling device (such as an electronic expansion valve). At the same time, the amount of flammable refrigerant is less due to safety considerations, so the pressure of the air conditioning system is higher than that of R410a The pressure of the air-conditioning system of refrigerant and R32 refrigerant is much lower, which will cause oil with a relatively high viscosity to block the throttling device, resulting in the inability of flammable refrigerants to participate in the cycle, which will cause the compressor to run idly, the capacity and operating power will decrease, and the system will fail. The oil lacks fluorine, and the motor of the compressor overheats after long-term operation, which greatly reduces the service life of the compressor and the system, and affects the user experience. great influence

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