Air conditioning unit and control method thereof

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning unit and a control method thereof. The problem that when an existing air conditioning unit operates in a low-temperature environment, the heat exchange effect becomes poor due to the fact that the air return temperature is too low is solved. Therefore, the air conditioning unit comprises a refrigerant circulation system, a regenerative branch and a regenerative heat exchanger, the refrigerant circulation system comprises a refrigerant circulation pipeline, an indoor heat exchanger, a four-way valve, a gas-liquid separator, a compressor and an outdoor heat exchanger, and the indoor heat exchanger, the four-way valve, the gas-liquid separator, the compressor and the outdoor heat exchanger are arranged on the refrigerant circulation pipeline; based on the arrangement of the regenerative branch and the regenerative heat exchanger, a medium-temperature medium-pressure refrigerant can be used for heating the refrigerant before entering the gas-liquid separator so as to increase the return gas temperature, and the temperature of the refrigerant in the regenerative branch is further increased through the refrigerant flowing through an outdoor coil pipe; and in addition, the communicating time of the regenerative branch and the refrigerant circulation system is accurately judged according to the temperature of the outdoor coil pipe and the return air temperature, so that the air conditioning unit can complete defrosting in the shortest time.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning unit and a control method thereof. Background technique [0002] In order to maintain a comfortable ambient temperature, air-conditioning units have become an essential device in people's lives. Generally, an air conditioning unit includes a refrigerant circulation pipeline and an indoor heat exchanger, a four-way valve, a gas-liquid separator, a compressor, and an outdoor heat exchanger arranged on the refrigerant circulation pipeline, wherein the four-way valve is used to control the flow of the refrigerant The refrigerant flow in the circulation pipeline is reversed, and the compressor is used to assist the refrigerant to convert between gaseous and liquid states. During its operation, the refrigerant circulates and exchanges heat between the indoor heat exchanger and the outdoor heat exchanger, thereby To achieve the effect of changin...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the heat exchange effect caused by the low return air temperature of the existing air-conditioning units when operating in a low-temperature environment To solve the problem of deterioration, the present invention provides an air conditioning unit, which includes a refrigerant circulation system, a heat recovery branch and a heat recovery heat exchanger, and the refrigerant circulation system includes a refrigerant circulation pipeline and a The indoor heat exchanger, four-way valve, gas-liquid separator, compressor and outdoor heat exchanger on the circulation pipeline, the heat recovery branch can communicate with the refrigerant circulation system, wherein the heat recovery branch One end is connected between the indoor heat exchanger and the outdoor heat exchanger, the other end of the heat recovery branch is connected to the inlet end of the gas-liquid separator, and the heat recovery heat exchanger is set as the The heat recovery branch and at least a part of the refrigerant circulation pipeline between the four-way valve and the gas-liquid separator can exchange heat in the heat recovery heat exchanger to increase the temperature of the return air, and are located at At least a part of the heat recovery branch downstream of the heat recovery heat exchanger is set close to the outdoor coil of the outdoor heat exchanger, so that the refrigerant flowing through the outdoor coil can lift the heat recovery branch in the heat recovery branch. Refrigerant temperature

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