Method and device for determining refrigerant quantity of refrigerating system

Abstract

The invention discloses a method for determining refrigerant quantity of a refrigerating system. The method comprises the following steps: 1, pre-storing a correspondence table of opening degree data of a specific electronic expansion valve and the temperature of a winding in the refrigerating system, and meanwhile, pre-storing a relation table of air exhausting temperature and winding temperature in the refrigerating system; 2, picking an opening degree of the special electronic expansion valve, and determining whether the air exhausting temperature is within the preset range, and entering step 3 if the air exhausting temperature is within the preset range; and 3, determining whether the motor winding temperature is within the preset range; if so, determining that refrigerants meet the system requirement; and if not so, determining that the refrigerants are insufficient, and prompting that the refrigerants are insufficient by the system. The invention also discloses a device for determining the refrigerant quantity of the refrigerating system. With the adoption of the method and the device, the fault determining is replaced by the refrigerating system refrigerant quantity determining; and the method and the device are of practical significance on repair and the system reliability improvement.

Description

technical field [0001] The invention relates to the field of refrigeration, in particular to a method and device for judging the amount of refrigerant in a refrigeration system. Background technique [0002] The refrigeration system consists of compressors, condensers, throttling devices and evaporators, which are connected and sealed by metal tubes, and filled with refrigerant inside. The compressors are usually fully enclosed, and the compressor completes the process from suction to exhaust. The process is realized through the operation of the motor. Since the motor inevitably generates heat during operation, if the heat cannot be taken away or balanced in time, the temperature of the motor winding will continue to rise, and eventually exceed the insulation safety temperature requirement, resulting in failure of the motor. The refrigerant flows through the motor before (or after) the compressor completes compression, and heats up the compressor motor through heat exchange....

AI Technical Summary

Problems solved by technology

[0006] Although the existing technical solutions can detect whether the refrigerant leaks, the reliability of this method is not high, but the amount of refrigerant in the system cannot be determined; and when the exhaust gas temperature is not high or low, it cannot It means that there is no lack of refrigerant or the technical problem that the motor is not necessarily damaged

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