Method for judging refrigerant leakage of air-conditioner

Abstract

The invention discloses a method for judging the refrigerant leakage of an air-conditioner, comprising following steps of: a. recording the temperature T of an indoor pipe coil before starting a compressor; b. judging whether the compressor is started or not, if so, conducting the next step, if not, returning to the step a; c. judging whether the compressor keeps running for x minutes, if so, conducting the next step, if not, returning to the step b; d. recording the temperature T' of the indoor pipe coil when the compressor keeps running for x minutes and recording indoor temperature Tr simultaneously; e. calculating temperature difference between the temperature T' of the indoor pipe coil when the compressor keeps running for x minutes and the temperature T of the indoor pipe coil before starting the compressor, calculating the temperature difference between the temperature T' of the indoor pipe coil when the compressor keeps running for x minutes and the indoor temperature Tr recorded simultaneously, to see whether the two temperature differences are less than y, if so, conducting step f, if not, then clearing the running time of the compressor and returning to the step b; and f. shutting down to report faults. The method for judging refrigerant leakage in the air-conditioner has high accuracy.

Description

technical field [0001] The invention relates to a method for judging refrigerant leakage in an air conditioner. Background technique [0002] The refrigerant in the air conditioner (machine) is likely to cause a large amount of leakage due to installation, welding, vibration and other reasons. When a large amount of refrigerant leaks (generally refers to the leakage of more than 40% of the refrigerant in the system), once the air conditioner fails to stop in time and reports a failure, but continues to run for a long time without refrigerant, the motor in the compressor will overheat , eventually damage the compressor, and even cause safety accidents. [0003] The traditional method for judging refrigerant leakage in air conditioners is generally to detect the air pressure in the air return pipe of the compressor. When the pressure value is lower than the alarm setting value, the compressor stops and reports a failure. But the above method has a big defect: the air pressur...

AI Technical Summary

Problems solved by technology

But the above method has a big defect: the air pressure in the air return pipe of the compressor is very low in the heating mode of the heat pump air conditioner. The lowest pressure value in the return air pipe of the unit in normal operation (1bar), so the alarm setting value is generally 0.5bar, but the air pressure in the return air pipe of the compressor is very high in the cooling mode (up to 8bar in the cooling mode), so the alarm setting The setting value is low, and the alarm pressure value may be reached only after the unit has leaked more than 80% of the refrigerant, and the system cannot provide protection for the refrigerant leaking within 80%

However, this method is only applicable to cooling mode, not heating mode; and this method only detects one temperature value, and the temperature sensor that detects the temperature of the indoor coil in actual operation is prone to deviation, which leads to false or missed failures. Therefore, the accuracy of this method is low

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