A control method for preventing air conditioner from blocking valve operation

Abstract

The present invention provides a control method for preventing the operation of the air conditioner from blocking the valve. The method includes: S1, start the air conditioner, record the suction temperature Ts0 of the compressor before starting, and detect the suction temperature Ts and the low pressure switch state of the compressor during operation ;S2, determine whether Ts-Ts0≥ΔT is satisfied within the start-up time t0 and the low-pressure pressure switch is in the disconnected state for a duration of t1, if so, stop the compressor and execute S3, if not, enter the low-pressure protection function mode; S3 , judge whether the time since the first power-on is less than or equal to t3, if not, enter the low pressure protection function mode, if so, execute S4; S4, judge whether the compressor has been shut down n times, if yes, confirm that the valve is blocked, if not, Then perform the next steps. The invention can judge whether the valve of the air conditioner is blocked in the start-up stage of the air conditioner to prevent damage to the air conditioner and avoid false protection, thereby ensuring the normal start of the air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a control method for preventing air conditioners from blocking valve operation. Background technique [0002] In the process of after-sales installation and maintenance of air conditioners, due to negligence of the installers, it often happens that the internal unit does not open the valve of the external unit after vacuuming, but directly starts the cooling operation. At this time, the refrigerant is concentrated on the condenser side of the external unit, and cannot circulate between the internal and external units, so that there is no refrigerant gas in the suction pipe of the compressor, resulting in the pressure on the suction side of the compressor being too low and no refrigerant entering the compressor to cool the compressor. Cause overheating damage to the compressor, especially for scroll compressors, if the valve is not opened and the vacuuming operation time ...

AI Technical Summary

Problems solved by technology

[0004] However, in the initial stage of the start-up of the air conditioner, the indoor refrigerant has not yet fully evaporated into a gaseous state, the compressor has insufficient air suction, and the low pressure is low. Especially in low temperature environments, due to the influence of the heat exchange temperature difference, the heat absorption and evaporation capacity of the evaporator is reduced. The heat release and cooling effect of the condenser is improved, so that the circulation flow in the air conditioner is reduced, and the compression suction pressure will be lower. This situation is likely to cause misoperation of the low pressure protection, making it difficult for the air conditioner to start normally

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