Air conditioner overload protection judgment method and device and air conditioner

Abstract

The invention provides an air conditioner overload protection judgment method, an air conditioner overload protection judgment device and an air conditioner, and relates to the air conditioner technology field. The air conditioner overload protection judgment method includes: according to evaluation temperature difference, pre-judging if a compressor of the air conditioner starts overload protection, wherein the evaluation temperature difference is temperature difference value, collected according to a preset time interval, between indoor temperature and temperature of an indoor coil pipe; ifpre-judging that the compressor starts the overload protection, controlling an inner draught fan of the air conditioner to stop running; after the inner draught fan stops running for an assigned period, evaluating if recorded overload protection time value needs to be increased according to new collected evaluation temperature difference so as to control an outer unit of the air conditioner to shut down when the recorded overload protection value exceeds preset threshold value. By performing dual judgement, the accurate and reliable overload time value of the compressor is obtained, and then the air conditioner can easily and timely decide if a shutdown protection mode needs to be used for guaranteeing use life of the compressor, and therefore damage to the compressor is avoided.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner overload protection judging method and device and an air conditioner. Background technique [0002] If the air conditioner is continuously operated at high load, there is a risk of burning out the compressor. However, under severe operating conditions (such as low voltage, dirty condenser, refrigerant leakage, etc.), it is difficult for a fixed-frequency air conditioner that cannot actively unload to avoid entering a state of continuous high-load operation. [0003] In order to protect the compressor, a protector is usually installed on the compressor. The protector adopts the method of disconnecting when the temperature of the compressor coil exceeds the normal use range to stop the compressor, and closing when the compressor coil temperature falls within the normal use range to make the compressor work normally to achieve the effect of protecting th...

AI Technical Summary

Problems solved by technology

However, the protection times of the protector are limited, and frequent overload protection can easily cause the protector to fail. In this way, the compressor will be damaged

In addition, due to cost considerations, the structure of the protector is simple, and it is usually difficult to obtain the number of overload protections achieved from the protector.

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