Air conditioning system and its control method

Abstract

The present invention provides an air conditioning system, in which a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, a throttling component and an indoor heat exchanger are sequentially arranged to form a refrigeration circuit; the outdoor heat exchanger includes a first flow collecting device, a second Two flow collecting devices and a plurality of flow pipes connected between the first flow collecting device and the second flow collecting device; the subcooler includes a first flow passage and a second flow passage, and the first flow passage of the first flow passage One end is connected to the second flow collecting device, the second end of the first flow passage is connected to the throttling part; the first end of the second flow passage is connected to the low-pressure suction end of the compressor, and the second flow passage is connected to the low-pressure suction end of the compressor. The second end is connected in series with the first solenoid valve to the second end of the first flow passage; the switching device and at least one flow pipe are arranged in series between the first flow collecting device and the second flow collecting device, and the switching device is also connected to first solenoid valve. It also relates to a control method. It realizes the low-temperature heating and deicing function of the air-conditioning system, and ensures the normal drainage of the drainage holes at the bottom of the heat exchanger.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to an air conditioning system and a control method thereof. Background technique [0002] Under normal circumstances, domestic multi-connection external unit products often use ordinary frequency conversion high-pressure chamber scroll compressors, that is, non-enthalpy-increasing scroll frequency conversion compressors. Compared with enthalpy-injection frequency conversion scroll compressors, they have "same frequency, low capacity , The same capacity, low energy efficiency, high high-frequency exhaust temperature, low heating capacity under low temperature conditions" shortcomings. At the same time, heating in winter in cold regions, such as the Northeast and Northwest regions, still mainly uses burning fossil raw materials, which not only causes a lot of environmental pollution, but also causes energy waste. [0003] There is still a problem to be solved in the existing low-temperature...

AI Technical Summary

Problems solved by technology

This kind of problem is that in cold areas, such as the northeast, northwest, and the north of the Yangtze River, the temperature may drop suddenly. For example, the temperature is close to 0°C during the day and there is sleet, but the temperature drops sharply at night, and the rain and snow become ice blocks. If the drain hole is blocked, although the external unit is defrosting at this time, it cannot drain normally due to the blockage of the drain hole, causing the liquid condensed water to turn into ice again, and the frost layer on the outdoor heat exchanger will continue to grow due to frequent defrosting , which will eventually affect the heat transfer of the outdoor heat exchanger, which will greatly affect the heat transfer performance and reliability of the unit

Images