Dual-stage enthalpy-increasing air-conditioning system

A dual-stage enthalpy-increasing air-conditioning system, comprising:

• a compressor 1, an outdoor heat exchanger 3, a first throttle component 8, an indoor heat exchanger 11, a flash evaporator 6 and a second throttle component 7, wherein the components are connected via pipelines;
• a first connecting port of the flash evaporator is connected with a first connecting port of the first throttle component;
• a second connecting port of the first throttle component is connected with the indoor heat exchanger;
• a second connecting port of the flash evaporator is connected with an air supplementing port of the compressor;
• a third connecting port of the flash evaporator is connected with a first connecting port of the second throttle component;
• a second connecting port of the second throttle component is connected with the outdoor heat exchanger;
• an air supplementing two-way valve 12 is provided between the second connecting port of the flash evaporator and the air supplementing port of the compressor;
• the first connecting port of the flash evaporator is located at a bottom of the flash evaporator;
• a pipeline connected with the first connecting port of the flash evaporator is flush with the bottom of the flash evaporator;
• the third connecting port of the flash evaporator is located at a top of the flash evaporator;
• a pipeline connected with the third connecting port of the flash evaporator stretches inside the flash evaporator with 5-10 cm to a bottom of the flash evaporator;
• when the air-conditioning system works in a heat mode or in a refrigeration, the air supplementing two-way valve 12 is opened, wherein when the air conditioner works in the refrigeration mode, refrigerant compressed by the compressor 1 enters the outdoor heat exchanger 3 via a four-way valve 2 to condense and release heat, and then enters the flash evaporator 6 after throttled by the second throttle component 7, at this time, the refrigerant flows through two ways, One way is that saturated refrigerant gas in an upper part of the flash evaporator flows out from the second connecting port of the flash evaporator and then flows into an air supplement port of the compressor 1 via the air supplementing two-way valve 12, the other way is that refrigerant liquid enters the indoor heat exchanger 11 through the first throttle component 8 to be evaporated as low-temperature and low-pressure refrigerant gas, which then enters the compressor 1 through an air inlet of the compressor, gets compressed at a bottom end of the compressor and mixed with the saturated refrigerant gas flowing through the air supplementing port of the compressor in middle cavity, and then is exhausted out the compressor after second compression;
• at this time, one cycle is completed, when the air conditioner works in the heat mode, the operation is opposite to that of the refrigeration mode, the refrigerant compressed by the compressor 1 enters the indoor heat exchanger 11 via the four-way valve 2 to condense and release heat, and then enters the flash evaporator 6 after throttled by the first throttle component 8, at this time, the refrigerant flows through two ways, One way is that the saturated refrigerant gas in the upper part of the flash evaporator flows out from the second connecting port of the flash evaporator and then flows into the air supplement port of the compressor via the air supplementing two-way valve 12;
• the other way is that the refrigerant liquid enters the outdoor heat exchanger 3 after throttled by the second throttle component 7 to be evaporated as low-temperature and low-pressure refrigerant gas, which then enters the compressor through the air inlet of the compressor, gets compressed at the bottom end of the compressor and mixed with the saturated refrigerant gas flowing through the air supplementing port of the compressor in the middle cavity, and then is exhausted out the compressor after second compression;
• at this time, one cycle is completed.