Method for protecting compressor of air conditioning unit

Abstract

The invention relates to a method for protecting a compressor of an air conditioning unit, which is characterized by comprising the following steps: 1) starting up and refrigerating: starting to count N=0 by a counter in the air conditioning unit, and executing step 2); 2) operating and executing step 3); 3) detecting return air temperature T1 of the air conditioning unit and coil temperature T2 of an evaporator and executing step 4); 4) recording operation time t, and executing step 5) and step 10); and 5) judging whether t is larger than or equal to 3min and (T1-T2) is smaller than 5 DEG C,executing step 6) if the above conditions are meet simultaneously, otherwise executing step 2). In the invention, only the control software part is required to change, so that the compressor of the air conditioning unit can avoid from being burnout in an abnormal condition, thus achieving the purpose of protecting the compressor under the premise of not changing the current air conditioning unit system; and the method has the characteristics of flexible operation, high safety degree and wide application range.

Description

technical field [0001] The invention relates to a protection method for an air conditioner compressor. Background technique [0002] The compressor is the core part of the air conditioner. When there is a problem with the system, if the protection is not good, the compressor will be burned out. When the compressor is powered on, it tends to burn out the compressor. [0003] In the current design of household air conditioners, most of the protection of the system under normal conditions is considered, such as the low temperature protection of the evaporator, see the attached figure 1 , the existing operation method includes the following steps: the first step is to start the refrigeration, and then execute the second step; the second step is to run, and then execute the third step; the third step is to detect the coil temperature T2 of the evaporator; Then execute the fourth step; the fourth step, judge whether the coil temperature T2 of the evaporator is less than 2°C, if ...

AI Technical Summary

Problems solved by technology

In this existing operation method, there is no protection for the compressor under abnormal conditions. If the air-conditioning system leaks due to refrigerant, the electric control device of the air conditioner will still supply power to the compressor. However, because the load is small and the current is small, The OLP protector that comes with the compressor cannot meet the operating conditions. After a long time, the compressor oil deteriorates seriously, which eventually causes the motor of the compressor to burn out

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