Detecting method and detecting device for plugging of filter of air conditioning system

Abstract

The invention discloses a detecting method for the plugging of a filter of an air conditioning system. The detecting method for the plugging of the filter of the air conditioning system comprises thesteps of temperature detection, filter plugging detection, and filter plugging alarming; in the step of temperature detection, in the refrigeration mode, the inlet temperature and the outlet temperature of the filter between a throttle part and a condenser are detected; in the step of filter plugging detection, whether the filter is plugged or not is judged according to the difference of the inlettemperature and the outlet temperature of the filter and the changing trend of the difference along with the time; and in the step of filter plugging alarming, alarming protecting is conducted on theplugging detected on the filter. By means of the detecting method, the filter plugging in the air conditioning system can be detected early, the air conditioning system is protected in advance, a compressor is prevented from being damaged due to the slow plugging of the filter, fixed node judging and trend judging are conducted on the filter plugging detection, the malfunction is avoided due to the only relying on the fixed node judging, and the judging accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method and a detection device for detecting clogging of an air conditioning system filter. Background technique [0002] During the production process of the air-conditioning system, such as pipeline welding, scales are produced. With the operation of the air-conditioning system, the scales will continue to accumulate on the filter before the throttling parts. If there is too much scale, the filter will eventually be blocked. [0003] In addition, during the use of the air conditioning system, if the compressor is used improperly, the compressor will return liquid, and the liquid refrigerant returning to the compressor will dilute the lubricating oil of the compressor, so that the moving parts of the compressor will not be well lubricated and appear wear and tear. The metal impurities produced by the wear of the internal parts of the compressor will continue to accumu...

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Problems solved by technology

[0003] In addition, during the use of the air conditioning system, if the compressor is used improperly, the compressor will return liquid, and the liquid refrigerant returning to the compressor will dilute the lubricating oil of the compressor, so that the moving parts of the compressor will not be well lubricated and appear wear and tear

The metal impurities produced by the wear of the internal parts of the compressor will continue to accumulate in the filter between the throttling parts along with the flow of the refrigerant, and eventually cause the filter to be clogged

[0004] The filter clogging in the above application scenarios is a slow process, especially in low temperature operating conditions, which will lead to a series of related designs such as anti-freezing protection of the unit, compressor discharge temperature protection, and compressor over-current protection. loss of protection

Therefore, if effective monitoring cannot be carried out at the initial stage of the clogging process, when the filter is almost completely blocked, the compressor will stop repeatedly due to low pressure protection, which will cause the compressor to no longer work normally

However, cleaning the system, replacing the compressor, and recharging the refrigerant will result in huge repair costs

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