Air conditioner and filth blockage detection control method and device therefor

Abstract

The invention belongs to the field of control of household appliances and particularly relates to an air conditioner and a filth blockage detection control method and device therefor. The device can be installed on an indoor unit of the air conditioner or an outdoor unit of the air conditioner, so that the corresponding air conditioner, the indoor unit thereof and the outdoor unit thereof are also provided. The method has the advantages that filth blockage of a filter screen of the indoor unit and / or a heat exchanger of the outdoor unit can be accurately detected; if filth blockage is detected, the indoor unit displays the filth blockage state through a filth blockage reminder unit to remind a user of handling; the outdoor unit directly controls a motor positively and reversely rotate to allow automatic dust removal after the air conditioner is off, and manual intervention is not required; the technical problem that the prior art fails to accurately detect the filth blockage state of the filter screen of the air conditioner and / or the heat exchanger of the air conditioner is solved; the demand of users for accurate detection and timely dust removal is met; the device and the method are also applicable to variable frequency machines and fixed frequency machines and is insusceptible to voltage of users' power grids; cooling and heating effects of the air conditioner are guaranteed; health of users and comfort are improved.

Description

technical field [0001] The invention belongs to the field of home appliance control, and in particular relates to an air conditioner and a method and device for detecting and controlling dirty blockage thereof. Background technique [0002] As a necessary electrical appliance for households, air conditioners have entered thousands of households, and general air conditioners include indoor units and outdoor units. In order to purify the indoor air of users, all the indoor units of air conditioners are equipped with filter screens, and the dust is deposited on the filter screen after being filtered, which needs to be cleaned regularly by the user, otherwise bacteria will easily breed and cause secondary pollution, and dust will affect the delivery of indoor units. The air volume and air supply distance affect the cooling and heating effects of the air conditioner. However, if the outdoor unit of the air conditioner is placed outdoors, the heat exchanger is also prone to colle...

AI Technical Summary

Problems solved by technology

There are defects in this method: because the user's environment is not the same, some places have good air quality, and the air conditioner rarely accumulates dust, so the cleaning cycle needs to be extended; while some places have poor air quality, the air conditioner is easy to accumulate dust, and the cleaning cycle needs to be shortened

[0006] The second method is to judge the condition of dirty blockage according to the operating current of the indoor and outdoor fans of the air conditioner. This method also has defects: the nominal value of the power grid in China is 220V, but in fact, the power grid is not the standard 220V, and the fluctuation of the grid voltage usually has 15%, or even 20%, so when the wind speed of the motor is stable, the current itself fluctuates greatly due to the fluctuation of the grid voltage; The voltage of the power grid will be pulled down; moreover, when the filter is dirty, the power of the fan is usually only reduced by 3%-5%. If only the current is detected when the voltage fluctuates, it is easy to misreport

Therefore, in different user environments, the fan current cannot accurately reflect the dirt and blockage of the evaporator filter, and the above scheme has obvious defects.

[0007] The third method is to judge the dirty blockage situation through the temperature value collected by the temperature sensor arranged on the evaporator / heat exchanger. This method also has defects. It is more suitable for fixed-frequency air conditioners. There is a certain law in the temperature of the heat exchanger. However, in the increasingly popular inverter air conditioners, the operating frequency of the compressor changes according to the cooling demand all the time. The temperature value of the evaporator is originally a changing value. Dirty and clogged evaporator filter

There are even some cases where the condensed water produced by the indoor evaporator is diverted to the outdoor heat exchanger for dust removal when the air conditioner is used for cooling.

[0008] To sum up, there is currently no technical solution that can accurately detect the dirty and clogged conditions of air conditioner filters and / or heat exchangers to meet the needs of users

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