Fluorine deficiency detection and protection method and system when the frequency conversion air conditioning system is started

Abstract

The invention provides a method and system for fluorine lacking detection and protection during the startup of a variable frequency air-conditioning system. According to the method and system for fluorine lacking detection and protection during the startup of the variable frequency air-conditioning system, through sensing bulbs arranged at the positions of an inlet of an evaporator, an outlet of the evaporator, an indoor unit and an outdoor unit and a pressure sensor arranged on the outdoor unit, the evaporator inlet temperature, the evaporator outlet temperature, the indoor temperature, the outdoor environment temperature and outdoor condensing pressure are detected respectively, and calculation and assessment are performed according to the detection result. When preset conditions are met, the fluorine lacking determination is performed step by step; when it is determined that a compressor is in a fluorine lacking state, the running of the compressor and an outer fan is stopped timely, so that after the variable frequency air-conditioning system is placed for a long term or transported for a long distance, whether the fluorine lacking occurs is detected during the startup and the protection is performed, and the problem that the low refrigerating efficiency and compressor abrasion intensification or burndown of the compressor occur when the compressor runs in a fluorine lacking state is solved.

Description

technical field [0001] The present application relates to the technical field of refrigeration, and more specifically, to a fluorine deficiency detection and protection method and system when an inverter air conditioner system is started. Background technique [0002] Air-conditioning systems generally have a rated amount of refrigerant injection. The system can work normally within a certain range of injection amount. If the amount of refrigerant in the system is too small, it will not only seriously reduce the cooling effect, but also increase the wear and tear of the compressor, and even cause compressor failure. of burnt. However, after long-term storage or long-distance transportation, the air-conditioning system may have a certain amount of refrigerant leakage. At this time, if it is directly started up, the cooling effect of the inverter air-conditioning system may be reduced, the wear of the compressor may be increased or the burn. For fixed-frequency air condition...

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Problems solved by technology

[0002] Air-conditioning systems generally have a rated amount of refrigerant injection. The system can work normally within a certain range of injection amount. If the amount of refrigerant in the system is too small, it will not only seriously reduce the cooling effect, but also increase the wear and tear of the compressor, and even cause compressor failure. burnt

However, after long-term storage or long-distance transportation, the air-conditioning system may have a certain amount of refrigerant leakage. At this time, if it is directly started up, the cooling effect of the inverter air-conditioning system may be reduced, the wear of the compressor may be increased or the burn

For fixed-frequency air conditioners, the lack of fluorine can be detected by means of low suction pressure or high discharge pressure, etc., but due to the frequency change of the compressor, the suction pressure and discharge pressure range of the variable frequency air conditioner system is relatively large, so it is impossible to check the suction pressure. Pressure, or exhaust pressure detection to judge the lack of fluorine

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