Air conditioner and its outdoor unit self-cleaning control method

Abstract

An air conditioner (10) and a self-cleaning control method for an outdoor unit (200) thereof. An outdoor unit heat exchange assembly (210) comprises: a first outdoor heat exchanger (211) and a second outdoor heat exchanger (212) connected in series; the first outdoor heat exchanger (211) is connected to a compressor (250) by means of a refrigerant flow direction switching device (260); an electronic expansion valve (230) is provided between the first outdoor heat exchanger (211) and the second outdoor heat exchanger (212). Moreover, the control method comprises: a self-cleaning controller (150) adjusts the refrigerant flow direction switching device (260) to a state in which a compressed refrigerant is provided to an indoor unit heat exchange assembly (110), adjusts the opening degree of the electronic expansion valve (230) so that frosting is continued on the surface of the first outdoor heat exchanger (211), switches the refrigerant flow direction switching device (260) after a preset first defrosting condition is met, so that the flow direction of the refrigerant is reversed, and removes attached contaminants with water formed by defrosting to implement self-cleaning of the first outdoor heat exchanger (211); the self-cleaning controller (150) continues adjusting the opening degree of the electronic expansion valve (230) so that the frosting is continued on the surface of the second outdoor heat exchanger (212), adjusts the opening degree of the electronic expansion valve (230) to the maximum after a preset second defrosting condition is met, so that the second outdoor heat exchanger (212) releases heat, and removes the attached contaminants with water formed by defrosting to implement self-cleaning of the second outdoor heat exchanger (212).

Description

technical field [0001] The invention relates to a household air conditioner, in particular to an air conditioner and a self-cleaning control method for an outdoor unit thereof. Background technique [0002] After the air conditioner is placed or used for a long time, a large amount of dust will accumulate outdoors. These dust and dirt adhere to the heat exchanger of the outdoor unit. On the one hand, it will reduce the heat transfer performance of the heat exchanger, resulting in a decrease in the performance of the air conditioner and an increase in energy consumption. [0003] The solution adopted by traditional air conditioners generally seldom maintains the outdoor unit, and generally relies on its condensed water or environmental wind and rain for cleaning. This method is difficult to ensure the cleaning effect of the outdoor unit, and long-term operation will greatly reduce the heat exchange efficiency of the outdoor unit. Contents of the invention [0004] An objec...

AI Technical Summary

Problems solved by technology

These dust and dirt adhere to the heat exchanger of the outdoor unit, on the one hand, it will reduce the heat transfer performance of the heat exchanger, resulting in a decrease in the performance of the air conditioner and an increase in energy consumption.

[0003] The solution adopted by traditional air conditioners generally seldom maintains the outdoor unit, and generally relies on its condensed water or environmental wind and rain for cleaning. This method is difficult to ensure the cleaning effect of the outdoor unit, and long-term operation will greatly reduce the heat exchange efficiency of the outdoor unit.

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