CN-122015342-A - Efficient heat exchange direct expansion air conditioning system and opening control method

CN122015342ACN 122015342 ACN122015342 ACN 122015342ACN-122015342-A

Abstract

The invention discloses a high-efficiency heat exchange direct expansion air conditioning system and an opening control method, the air conditioning system comprises a compressor, a four-way valve, a condenser, a heat exchanger, an expansion valve, a first gas-liquid separator, an evaporator and a second gas-liquid separator. The compressor is connected with the four-way valve and the second gas-liquid separator. The C end of the four-way valve is connected with the input end of the condenser, and the E end is connected with the output end of the evaporator. The output end of the condenser is connected with a liquid pipe of the heat exchanger. The liquid pipe of the heat exchanger is connected with the expansion valve, and the air pipe is connected with the S end of the four-way valve, the first gas-liquid separator and the second gas-liquid separator. The output end of the expansion valve is connected with the first gas-liquid separator. The gas phase output end of the first gas-liquid separator is connected with the gas pipe of the heat exchanger, and the liquid phase output end is connected with the evaporator. The invention adds a gas-liquid separator after the expansion valve throttles to prevent the gaseous refrigerant from entering the evaporator. The heat exchanger improves the overheat temperature of the gaseous refrigerant, reduces the supercooling degree of the liquid refrigerant, and effectively improves the liquid refrigerant duty ratio in the evaporator.

Inventors

GAO XUAN
GUO WEI
CHEN WENGONG
XU GUOQING

Assignees

北京环都拓普空调有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (7)

1. The efficient heat exchange direct expansion air conditioning system is characterized by comprising a compressor, a four-way valve, a condenser, a heat exchanger, an expansion valve, a first gas-liquid separator, an evaporator and a second gas-liquid separator; The output end of the compressor is connected with the compressor exhaust end of the four-way valve, and the input end of the compressor is connected with the output end of the second gas-liquid separator; The evaporator end of the four-way valve is connected with the output end of the evaporator; the output end of the condenser is connected with the input end of the liquid pipe of the heat exchanger; the liquid pipe output end of the heat exchanger is connected with the input end of the expansion valve, the air pipe input end is connected with the air suction end of the compressor of the four-way valve and the gas phase output end of the first gas-liquid separator, and the air pipe output end is connected with the input end of the second gas-liquid separator; The output end of the expansion valve is connected with the input end of the first gas-liquid separator; The gas phase output end of the first gas-liquid separator is connected with the gas pipe input end of the heat exchanger, and the liquid phase output end is connected with the input end of the evaporator.
2. The efficient heat exchange direct expansion air conditioning system according to claim 1, wherein: The heat exchanger is a medium heat exchanger provided with a liquid pipe pipeline and an air pipe pipeline.
3. The efficient heat exchange direct expansion air conditioning system according to claim 2, further comprising a first check valve, a second check valve, a third check valve, and a fourth check valve; The condenser comprises a condenser, a heat exchanger, a liquid pipe, a first gas-liquid separator, a second gas-liquid separator, a fourth one-way valve, an evaporator, a third one-way valve, a liquid pipe, a second gas-liquid separator, a third one-way valve, a liquid pipe, a second one-way valve and a third one-way valve, wherein the output end of the condenser is connected with the input end of the first one-way valve and the output end of the fourth one-way valve, the liquid pipe of the heat exchanger is connected with the output end of the first one-way valve and the output end of the third one-way valve, the liquid phase output end of the first gas-liquid separator is connected with the input end of the second one-way valve and the input end of the fourth one-way valve, and the input end of the evaporator is connected with the second one-way valve.
4. The efficient heat exchange direct expansion air conditioning system according to claim 3, further comprising a first regulating valve and a second regulating valve; the input end of the first regulating valve is connected with the liquid pipe input end of the heat exchanger 4, the output end of the first regulating valve is connected with the liquid pipe output end of the heat exchanger, the input end of the second regulating valve is connected with the gas phase output end of the first gas-liquid separator, and the output end of the second regulating valve is connected with the gas pipe input end of the heat exchanger.
5. The efficient heat exchange direct expansion air conditioning system according to claim 4, further comprising a high pressure gauge, a low pressure gauge, an intake thermometer and an evaporation thermometer; the high-pressure manometer is arranged at the output end of the compressor, the low-pressure manometer is arranged at the input end of the compressor 1, the air suction thermometer is arranged at the input end of the second gas-liquid separator, and the evaporation thermometer is arranged at the air pipe input end of the heat exchanger.
6. The efficient heat exchange direct expansion air conditioning system according to claim 5, wherein: The expansion valve is electrically connected with the low-pressure manometer and the air suction thermometer, the first regulating valve is electrically connected with the air suction thermometer, and the second regulating valve is electrically connected with the high-pressure manometer and the low-pressure manometer.
7. An opening control method for the high-efficiency heat exchange direct expansion air conditioning system according to any one of claims 1 to 6, characterized by comprising the following steps: Step S1, obtaining low pressure and suction temperature of a compressor, calculating superheat degree of an evaporator or a heater Kuang Lengning under refrigeration working conditions, and comparing the superheat degree with a target superheat degree, and increasing opening of an expansion valve if the superheat degree is higher than the target superheat degree; S2, obtaining the air suction temperature of the compressor, and comparing the air suction temperature with a target air suction temperature, and reducing the opening of the first regulating valve if the air suction temperature is higher than the target air suction temperature; And S3, obtaining high-pressure and low-pressure of the compressor, calculating the circulation quantity of the refrigerant, and controlling the opening of the second regulating valve according to the opening programs of the second regulating valve corresponding to different high-pressure and low-pressure programmed in advance.

Description

Efficient heat exchange direct expansion air conditioning system and opening control method Technical Field The invention relates to a high-efficiency heat exchange direct expansion air conditioning system, and also relates to an opening control method for the air conditioning system, belonging to the technical field of air conditioning. Background The conventional air conditioner heat exchanger realizes supercooling and superheating of the refrigerant through the temperature of the refrigerant or air. Because the supercooling and superheating of the refrigerant are non-phase change heat exchange, the heat exchange efficiency is very low, and thus a large amount of heat exchange area is wasted to obtain higher supercooling and superheating. In chinese patent application number 202210188453.6, a heat pump system and a laundry treatment apparatus are disclosed. The heat pump system comprises a gas-liquid separator, a compressor, a condenser, a throttling device and an evaporator which are sequentially connected in series on a refrigerant loop. The gas-liquid separator is arranged on the refrigerant loop between the outlet of the throttling device and the inlet of the evaporator so as to separate the refrigerant before entering the evaporator into gas and liquid. In addition, in the chinese invention of patent No. ZL 201810528759.5, an air conditioner is disclosed. The air conditioner is configured by connecting a compressor, an indoor heat exchanger, a main expansion valve, an outdoor heat exchanger, and a four-way valve through pipes for flowing refrigerant, and has a first flow path between an outlet of the indoor heat exchanger and an inlet of the outdoor heat exchanger, and a second flow path between an outlet of the outdoor heat exchanger and an inlet of the four-way valve, wherein the main expansion valve is disposed in the first flow path. The air conditioner further comprises a heating unit for heating the refrigerant of the gas-liquid two phases flowing out of the evaporator to the gas-phase single phase before reaching the four-way valve, thereby reducing heat loss of the four-way valve and improving the energy efficiency ratio of the air conditioner. Similarly, the refrigerant which enters the evaporator through throttling has a ratio of 20% -35% of gas, belongs to non-phase change heat exchange, and has low heat exchange efficiency. The refrigerant at the outlet of the evaporator has a certain duty ratio in a liquid state, so that liquid impact can be caused to the compressor. The prior art is to occupy a large amount of heat exchange area to counteract the low efficiency of non-phase change heat exchange, and introduce an external heat source heating air pipe to vaporize the refrigerant, so that the equipment cost is high and the system energy efficiency is low. Disclosure of Invention The invention aims to provide a high-efficiency heat exchange direct expansion air conditioning system. Another technical problem to be solved by the present invention is to provide a method for controlling the opening degree of the air conditioning system. In order to achieve the technical purpose, the invention adopts the following technical scheme: According to a first aspect of an embodiment of the present invention, there is provided a high-efficiency heat exchange direct expansion air conditioning system, including a compressor, a four-way valve, a condenser, a heat exchanger, an expansion valve, a first gas-liquid separator, an evaporator, and a second gas-liquid separator; The output end of the compressor is connected with the compressor exhaust end of the four-way valve, and the input end of the compressor is connected with the output end of the second gas-liquid separator; The evaporator end of the four-way valve is connected with the output end of the evaporator; the output end of the condenser is connected with the input end of the liquid pipe of the heat exchanger; the liquid pipe output end of the heat exchanger is connected with the input end of the expansion valve, the air pipe input end is connected with the air suction end of the compressor of the four-way valve and the gas phase output end of the first gas-liquid separator, and the air pipe output end is connected with the input end of the second gas-liquid separator; The output end of the expansion valve is connected with the input end of the first gas-liquid separator; The gas phase output end of the first gas-liquid separator is connected with the gas pipe input end of the heat exchanger, and the liquid phase output end is connected with the input end of the evaporator. Wherein, preferably, the heat exchanger is a medium heat exchanger provided with a liquid pipe pipeline and an air pipe pipeline. Wherein preferably, the high-efficiency heat exchange direct expansion air conditioning system further comprises a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve; The condenser comprises a condenser, a h