Heat pump type air conditioner outdoor machine

Abstract

The invention relates to an outdoor unit of a heat pump type air conditioner. The outdoor unit comprises a shell and a compressor, a heat exchanger and a fan system arranged in the shell. The shell is provided with a first air inlet and an air outlet, the air outlet is corresponding to the fan system, the first air inlet is corresponding to the heat exchanger. The invention is characterized in that: the outdoor unit also comprises a compressor waste heat collection device, the shell is also provided with a second air inlet on the position corresponding to the waste heat collection device; when the outdoor unit works, the waste heat collection device preheats the air which enters through the second air inlet and conveys the preheated air to a plenum box which covers outside the heat exchanger through a heating pipeline, so that the mixed air of the outside air from the first air inlet and the preheated air from the heating pipeline enters into an inner cavity of the plenum box. Compared with the prior art, the outdoor unit improves the air temperature of the heat exchanger so as to avoid frosting of the heat exchanger and overcome the defect that the prior air conditioner needs to close down twice to defrost the heat exchanger to affect the heating effect.

Description

technical field [0001] The invention relates to an outdoor unit of a heat pump air conditioner. Background technique [0002] When the existing heat pump air conditioner is in heating operation in winter, if the ambient temperature is low, frost will form on the fins of the heat exchanger of the outdoor unit; The evaporation temperature of the heat exchanger will be below 0°C. At this time, the moisture in the air will frost on the surface of the outdoor heat exchanger. As the operating time increases, the thickness of the frosting becomes larger and larger, and the air passage between the cooling fins of the heat exchanger is partially or completely occupied by frost, thereby increasing the thermal resistance and wind resistance, which directly affects its heat transfer efficiency. Therefore, the heat pump The defrost function setting of the air conditioner is required. [0003] The commonly used defrosting methods for outdoor units of existing air conditioners include: r...

AI Technical Summary

Problems solved by technology

With this defrosting method, the heating operation must be stopped. Generally, it takes 1 / 10 of the time to defrost, plus the interval between two shutdowns, it takes about 1 / 6 of the time to defrost, which seriously affects the heating effect.

[0004] In addition, the outdoor heat exchangers of heat pump air conditioners are generally bent. The outdoor unit of the air conditioner with a curved heat exchanger has a fan system installed in front of the heat exchanger. The forced convection part of the heat exchanger only accounts for about 55% of the total area of ​​the heat exchanger, and the other parts of the heat exchanger are all natural convection heat transfer, and the heat transfer effect is difficult to guarantee

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