Working defrosting method of variable-frequency air-conditioner

Abstract

The invention discloses a working defrosting method of a variable-frequency air-conditioner. The working defrosting method provides two defrosting modes of defrosting during heating start-up and defrosting during normal working; the function of defrosting during heating start-up of the method comprises the following steps that the outdoor temperature and the coil temperature are judged before start-up is carried out, so that the situation that the heating effect is reduced due to the thickening of a frost layer caused by the fact that a heating mode is directly started is avoided, and meanwhile, an indoor evaporator is preheated, so that the air conditioner can enter a heating state faster, and the heating effect is better; and according to the method, the defrosting process during normalworking comprises the following steps that a compressor is subjected to frequency reduction treatment, after working stably, the compressor stops working, the opening degree of an electronic expansionvalve is maximum, enough time is given to balance the air pressure difference brought by airflow impact, and then a four-way valve is reversely rotated, so that the noise is reduced, and the better experience effect is given to the user.

Description

technical field [0001] The invention relates to the technical field of air conditioning control, in particular to a working defrosting method for an inverter air conditioner. Background technique [0002] With the improvement of people's living standards, air conditioners have become an indispensable household appliance. When the air conditioner is in heating operation, since the temperature of the wall surface of the outdoor unit coil is lower than the dew point temperature of the outdoor air, condensed water will be generated on the fins of the outdoor heat exchanger. When the temperature of the coil is lower than 0°C, the condensed water will Frost condenses on the surface of the container. Especially in winter when the weather is cold, the air conditioner is prone to frost when it operates in such an environment. If the snow and frost layer on the air conditioner is not cleaned in time after the snow falls, and the heating is turned on directly, the frost layer will bec...

AI Technical Summary

Problems solved by technology

Although this method has high defrosting efficiency and long defrosting time under certain circumstances, there are still some disadvantages. On the one hand, since the compressor is still running during defrosting, there Large pressure difference, sudden change of direction will cause the airflow impact system to make a "puff" sound, especially the noise generated by the inverter air conditioner, long-term airflow impact will reduce the performance of the machine and affect the service life, and the four-way valve will cause The noise will also bring uncomfortable experience to users

On the other hand, after this defrosting method is turned on, it takes a while to heat, and the heating effect is slow. The front defrosting is not clean. In this case, turn on the heating directly, and the frost layer will become thicker and thicker. The heat will not be fully converted and absorbed, and the plate temperature will continue to drop. The heating performance of the whole machine will be greatly weakened. The load of the compressor will gradually increase, while the temperature blown out by the indoor unit will gradually decrease, which will also bring uncomfortable experience to the user.

[0004] The intelligent defrosting of the air conditioner will cause problems such as wrong defrosting and endless defrosting, resulting in the loss of heating capacity and the decline of heating efficiency, and the problem of high noise during the defrosting process will affect the user experience.

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