Control method for outdoor fan of air conditioner

Abstract

The invention discloses a control method for an outdoor fan of an air conditioner. The control method comprises the following steps that the air conditioner operates in a refrigeration manner, and the outdoor environment temperature T4 is detected; when the outdoor environment temperature T4 is lager than the preset environment temperature i, the outdoor fan is controlled to be kept in the current positive rotation state; when the outdoor environment temperature T4 is smaller than the preset environment temperature i, the rotating speed of the outdoor fan and a detection object are detected, and the detection object is at least one of the running frequency F of a compressor, the temperature T3 of an outdoor heat exchanger and the pressure PL in an indoor heat exchanger; when the rotating speed of the outdoor fan is the preset rotating speed and the detection result of the detection object meets the preset conditions, the outdoor fan is controlled to do reverse rotation motion; and when the rotating speed of the outdoor fan is higher than the preset rotating speed or the detection result of the detection object does not meet the preset condition, the outdoor fan is controlled to be kept in the current positive rotation state. According to the control method, the air volume of the outdoor fan is lowered, the pressure of the condensation side is increased, and the air conditioner can output refrigerating capacity continuously.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to a method for controlling an outdoor fan of an air conditioner. Background technique [0002] With the improvement of the design level of modern buildings, the thermal insulation performance of buildings is getting better and better. In some special places such as conference rooms, Internet cafes, kitchens, computer rooms, and areas heated by fireplaces, the indoor temperature of such places will Even when the outdoor temperature is below zero, it is still necessary to use an air conditioner for cooling. Running refrigeration when the outdoor temperature is low, the pressure on the high pressure side is low, the compression ratio of the compressor is low, the liquid supply of the refrigeration system is insufficient, the oil return will become difficult, and eventually the compressor will be damaged due to liquid hammer. [0003] The existing methods to improve the low-temperature cooli...

AI Technical Summary

Problems solved by technology

Running refrigeration when the outdoor temperature is low, the pressure on the high pressure side is low, the compression ratio of the compressor is low, the liquid supply of the refrigeration system is insufficient, the oil return will become difficult, and eventually the compressor will be damaged due to liquid hammer

[0003] The existing methods to improve the low-temperature cooling capacity and reliability mainly include the following two methods. One is to increase the high-pressure side pressure by reducing the speed of the outdoor unit to increase the flow rate of the refrigeration system, thereby improving the cooling performance. The other is to add an external device to the outdoor unit to The return air part of the outdoor unit is led back to reheat the condenser to increase the pressure on the high pressure side. The first method is relatively simple, but there is a minimum speed requirement to ensure the stable operation of the outdoor fan. For energy-efficient products, the outdoor condenser is relatively large. Even when the outdoor fan is running at the lowest speed, it is still difficult to increase the pressure on the condensation side. In this case, the low-temperature refrigeration performance is poor. Method 2 requires additional devices, and the cost is relatively high. more complex operation

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