Method for detecting variable frequency air conditioner coolant leakage based on speed range parameters

Abstract

The invention discloses a method for detecting variable frequency air conditioner coolant leakage based on speed range parameters; the method comprises the steps of determining whether a detection program uses a refrigerating or heating mode according to indoor and outdoor ambient temperatures; measuring electrical parameters and temperature parameter of an air conditioner system within a preset speed range, and measuring compressor voltage and current parameters, indoor and outdoor ambient temperatures, and indoor and outdoor heat exchanger temperatures when a compressor runs stably at each frequency node; acquiring a compressor power curve within the preset speed range; acquiring an indoor heat exchanger temperature change curve within the preset speed range; judging whether the compressor runs normally or not; if yes, judging effectiveness of the measured temperature change curve; judging whether coolant leaks or not. By measuring, within a preset speed range, the indoor heat exchanger temperature parameter of an air conditioner system and judging whether coolant leaks or not according to temperature change law, detection accuracy is greatly improved.

Description

technical field [0001] The invention relates to the field of application of permanent magnet synchronous motors and the field of frequency conversion air conditioners, in particular to a method for detecting refrigerant leakage of frequency conversion air conditioners based on speed interval parameters. Background technique [0002] The air conditioner has been widely used due to its cooling / heating function. During the use of the air conditioner, refrigerant leakage may occur, thereby affecting the cooling / heating effect of the air conditioner. A large part of commonly used air conditioners do not have refrigerant leakage detection and alarm display functions, so when refrigerant leakage affects the cooling / heating effect, users cannot judge the fault. [0003] Few air conditioners have refrigerant leakage detection function: patent 201410623887.X discloses a detection method and system for air-conditioning refrigerant leakage: by detecting the refrigerant mass flow in the ...

AI Technical Summary

Problems solved by technology

The latter two methods will not increase the cost of hardware, but in some occasions, such as the slow leakage of refrigerant in the inverter air conditioner and the amount of refrigerant is too small (for example, 20% less than the nominal value), the control program will automatically increase the compression The operating frequency of the machine should be adjusted so that the temperature of the indoor heat exchanger reaches the expected temperature. At this time, the conditions of the two methods based on the temperature detection method of the indoor heat exchanger in patent 201410851559.5 and patent 201410606729.3 are not satisfied, and it is impossible to detect whether the refrigerant is leaking

The refrigerant leakage detection method based on the temperature of the indoor heat exchanger is more suitable for the situation where the refrigerant leakage has caused a serious shortage of refrigerant, which is not conducive to the early stage fault diagnosis of slow refrigerant leakage

[0004] Also assume another situation, the air conditioner is in the cooling mode, the indoor heat exchanger is covered with dust and the cooling effect is deteriorated, but the temperature of the indoor heat exchanger is still very low at this time, patent 201410851559.5 and patent 201410606729.3 are based on the indoor heat exchanger temperature The conditions of the detection method are not satisfied, and the reason for the deterioration of the cooling effect of the air conditioner concerned by the user cannot be found out

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