Defrosting control method for heat-pump air conditioner

Abstract

The invention discloses a defrosting control method for a heat-pump air conditioner. A manual intervention measure is set for a defrosting way; in order to prevent faulty actions, the defrosting way of the air conditioner can only be intervened manually in a heating mode during normal running of the air conditioner; and in order to prevent faulty actions of a user during daily operation of the air conditioner, no special manual intervention keys are not set on a remote controller or an operation panel of the air conditioner, and a manual intervention function is realized via key combination and combination of uncommon operating ways. According to the defrosting control method, faulty defrosting actions caused by the differences among environmental and regional factors and the like can be avoided; and moreover, a manual frosting mode can be switched to under the condition that defrosting is incomplete due to uncertain factors, so that complete defrosting is ensured, vicious circle is avoided, and the heating efficiency of the heat-pump air conditioner is increased.

Description

Technical field: [0001] The invention relates to a defrosting control method of a heat pump air conditioner. Background technique: [0002] In traditional heat pump air conditioners, the following methods are mostly used for defrosting: 1. The indoor coil temperature indirect judgment method "indoor coil temperature change rate + time method" is used to judge whether the outdoor heat exchanger is frosted, that is, by detecting the indoor coil temperature. The rate of change of coil temperature Th, combined with time control (that is, to determine a minimum operating time to prevent frequent defrosting); 2. The coil temperature sensor on the outdoor heat exchanger to judge the frosting of the outdoor heat exchanger. However, the two defrosting methods have their own applicable regions, climates, and environments, and have certain shortcomings under other environmental conditions, making it difficult to adapt to all use environments. There will be false defrosting and defrost...

AI Technical Summary

Problems solved by technology

At this time, if the outdoor fan motor drives the fan blades to rotate and hit the ice, it will easily cause the fan blades to break or the motor to stall, and the consequences will be disastrous (after the motor is blocked, the current increases and the temperature rise of the motor continues to rise; without any protection Or when the protection measures fail, it is easy to cause short circuit between lines and motor burnout, etc.)

Due to the ice or frost on the surface of the copper tube of the heat exchanger of the outdoor unit of the air conditioner, the heat cannot be fully converted and absorbed, and the temperature of the tube will continue to drop, so the heating performance of the whole machine will be greatly weakened, and the compressor load will gradually increase. , and affect the service life

And the temperature blown out by the indoor unit gradually decreases, which will also bring discomfort to the user.

[0003] Inadvertent defrosting will result in the loss of heating capacity and the decline of heating effect, while incomplete defrosting will bring greater hidden dangers. In the case of incomplete defrosting, the only way to do this is to pour boiling water on the outdoor heat exchanger. , unplug the four-way valve connection, forced refrigeration and other methods to solve the problem

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