The control method of air-conditioning heating fluorine deficiency protection and compressor frequent overload protection

Abstract

The invention relates to a control method for air conditioner heating fluoride shortage protection and compressor frequent overload preventing protection. By means of the control method, compressor overload and fluoride shortage protection can be effectively differentiated; one time of overload protection happens to a compressor after a period of time; an air conditioner can continue to run; it is avoided that an air conditioner set immediately reports fault shutdown, and experience of a user is affected; only when the overload time number exceeds a certain number, can the air conditioner report the fault shutdown, and the fault shutdown cannot be restored; and besides, continuous overload happens to the air conditioner set within a short period of time, protection can be performed in time, and it is avoided that because of frequent overload protection of the compressor, the compressor is damaged.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a control method for protection against fluorine deficiency in heating and heating of an air conditioner and protection against frequent overloading of compressors. Background technique [0002] Air conditioner is more and more subject to liking of people as a kind of household appliance of indoor temperature regulation. Measures to protect the compressor of the air conditioner: when the refrigerant is insufficient, a fluorine-deficiency protection control logic is set to prevent the compressor from running at high temperature for a long time; Long-term operation at high temperature or abnormal voltage. [0003] At present, the control method of fluorine deficiency protection: in the heating mode, after the compressor continues to run for a period of time, the temperature difference between the internal disk temperature and the indoor temperature is detected within n seconds. If ...

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Problems solved by technology

[0003] At present, the control method of fluorine deficiency protection: in the heating mode, after the compressor continues to run for a period of time, the temperature difference between the internal disk temperature and the indoor temperature is detected within n seconds. If the difference is less than a certain value, it will be judged to report fluorine deficiency protection. After the fluorine deficiency protection is reported, the air conditioner is shut down and cannot be recovered. Generally, it needs to be powered off to eliminate the fault. For example, the Chinese patent application "Method for Judging Refrigerant Leakage in Air Conditioners" whose patent number is CN200910099237.9 (application publication number is CN101566517A), This protection method has the following problems: when the refrigerant is in a normal state and the unit is under severe heating conditions, after the compressor is overloaded, the tube temperature difference also meets the fluorine-deficiency protection conditions, causing the unit to report a fluorine-deficiency protection failure, the air conditioner cannot operate, and cause After-sales maintenance personnel make misjudged maintenance; in addition, the fluorine deficiency protection control is always under inspection during the operation of the unit. If the unit is continuously shut down for a period of time due to ultra-low voltage, etc., it is easy to cause false alarms for fluorine deficiency protection. When the voltage After recovery, it cannot be started. Therefore, it is easy to cause the compressor overload protection to be confused with the fluorine-deficiency protection, resulting in false alarms for the fluorine-deficiency protection.

[0004] The existing automatic overload protection of the compressor relies on the high-temperature deformation action of the bimetal in the compressor overload protector to disconnect the protection, but there are the following problems: the compressor is easy to start and stop frequently due to voltage fluctuations, which affects the service life of the compressor; The compressor is prone to frequent start and stop problems under abnormal high temperature conditions, which affects the service life of the compressor

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