Air conditioning system

Abstract

The utility model discloses an air conditioning system, which comprises a compressor; an indoor heat exchanger; an outdoor heat exchanger; a throttling device; a gas-liquid separation assembly; a four-way valve; the gas-liquid separation assembly comprises a gas-liquid separator, and the gas-liquid separator is connected between the compressor and the four-way valve; the heat exchange piece is wound on the outer side of the gas-liquid separator so as to exchange heat with the gas-liquid separator; wherein the heat exchange piece is connected with one end of the indoor heat exchanger or one end of the outdoor heat exchanger so as to exchange heat through a refrigerant and the gas-liquid separator. In the refrigerating or heating mode, a refrigerant can flow into the heat exchange piece, and the liquid refrigerant in the gas-liquid separator is heated to be converted into a gas state, so that the refrigerant at an outlet of the gas-liquid separator, namely an air suction port of the compressor, is always kept at a reasonable positive superheat degree, namely is basically in the gas state; therefore, the liquid impact phenomenon under different working conditions, especially in a low-temperature environment, is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] With the development of society and the advancement of science and technology, the application scope of air conditioners is becoming more and more extensive. In addition to household air conditioners, more and more commercial air conditioners are used in the commercial field in recent years. For example, air conditioners used in data centers need to ensure that the equipment in the data center is kept in a fixed temperature range all year round. In addition, the equipment in the data center generates a lot of heat, so the air conditioner may also perform cooling operation in the cold winter.

[0003] In the related art, in order to prevent liquid refrigerant from entering the compressor and causing compressor failure, the air-conditioning system is generally equipped with a gas-liquid separator at the suction port of the compressor, which is used to separate and store part of the liquid refrigerant on the compressor suction line to ensure that the refrigerant entering the compressor is basically in a gaseous state, so as to ensure the reliable operation of the compressor.

[0004] However, when operating in heating mode under low temperature environment, due to the small heat exchange temperature difference, the outdoor heat exchanger absorbs less heat, resulting in the refrigerant superheat entering the gas-liquid separator being small or negative, and the liquid refrigerant being much more than the normal range. When the liquid refrigerant accumulates more in the gas-liquid separator, the gas-liquid separator basically cannot play the role of gas-liquid separation, resulting in the liquid refrigerant easily entering the compressor, posing a risk of liquid hammer to the compressor. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an air conditioning system, in which, in cooling or heating mode, the refrigerant flows into the heat exchange element and heats the liquid refrigerant inside the gas-liquid separator to convert it into a gaseous form, thereby avoiding the occurrence of liquid hammer under different working conditions, especially in low temperature environments.

[0006] According to the first aspect of the present invention, the air conditioning system includes: a compressor having an air intake port and an air exhaust port; an indoor heat exchanger; an outdoor heat exchanger; a throttling device connected between one end of the indoor heat exchanger and one end of the outdoor heat exchanger to change the pressure of the refrigerant; a gas-liquid separation component, one end of which is connected to the air intake port, and the gas-liquid separator is used to separate gaseous refrigerant and liquid refrigerant; a four-way valve, which is respectively connected to the other end of the gas-liquid separation component, the exhaust port, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger, so as to form a cooling circulation loop for the flow of refrigerant; the gas-liquid separation component includes: a gas-liquid separator, which is connected between the compressor and the four-way valve; a heat exchange element, which is arranged around the outside of the gas-liquid separator to exchange heat with the gas-liquid separator; wherein the heat exchange element is connected to one end of the indoor heat exchanger or one end of the outdoor heat exchanger to exchange heat with the gas-liquid separator through the refrigerant.

[0007] According to the air-conditioning system of the embodiment of the utility model, in the cooling or heating mode, the refrigerant will flow into the heat exchange element and heat the liquid refrigerant inside the gas-liquid separator to convert it into a gaseous form, ensuring that the refrigerant at the outlet of the gas-liquid separator, i.e., the suction port of the compressor, always maintains a reasonable positive superheat, i.e., is basically in a gaseous form, thereby avoiding the occurrence of liquid hammer under different working conditions, especially in low temperature environments.

[0008] According to some embodiments of the utility model, the air-conditioning system also includes: a first branch connected between the indoor heat exchanger and one end of the heat exchange element; a second branch, one end of which is connected to the other end of the heat exchange element, and the other end is connected between the indoor heat exchanger and the throttling device.

[0009] According to some embodiments of the present invention, a first control valve is provided on the first branch, a second control valve and a third control valve connected in series are provided on the second branch, and the third control valve is connected to the other end of the heat exchange element.

[0010] According to some embodiments of the utility model, the air-conditioning system also includes: a third branch connected between the outdoor heat exchanger and one end of the heat exchange element; a fourth branch, one end of which is connected to the other end of the heat exchange element, and the other end is connected between the outdoor heat exchanger and the throttling device.

[0011] According to some embodiments of the utility model, a fourth control valve is provided on the third branch, a fifth control valve and a sixth control valve connected in series are provided on the fourth branch, and the sixth control valve is connected to the other end of the heat exchange element.

[0012] According to some embodiments of the utility model, the air-conditioning system also includes: a seventh control valve, including: a first valve port, a second valve port and a third valve port, the third valve port is selectively connected to the first valve port or the second valve port, the third valve port is connected to one end of the heat exchanger; a fifth branch, connected between the indoor heat exchanger and the first valve port; a sixth branch, connected between the outdoor heat exchanger and the second valve port.

[0013] According to some embodiments of the utility model, the air-conditioning system also includes: an eighth control valve, including: a fourth valve port, a fifth valve port and a sixth valve port, the sixth valve port is selectively connected to the fourth valve port or the fifth valve port, and the sixth valve port is connected to one end of the heat exchanger; a seventh branch, one end of which is connected to the fourth valve port, and the other end is connected between the indoor heat exchanger and the throttling device; an eighth branch, one end of which is connected to the fifth valve port, and the other end is connected between the outdoor heat exchanger and the throttling device.

[0014] According to some embodiments of the utility model, a temperature sensor and a pressure sensor are arranged between one end of the gas-liquid separator and the air intake port of the compressor, the temperature sensor is used to obtain the temperature of one end of the gas-liquid separator, and the temperature sensor is used to obtain the pressure of one end of the gas-liquid separator.

[0015] According to some embodiments of the present invention, the heat exchange element is a spiral heat exchange tube and is a copper tube; and the gas-liquid separator is an aluminum gas-liquid separator.

[0016] The air conditioning system according to the second embodiment of the utility model includes: a compressor having an air intake port and an air exhaust port; an indoor heat exchanger; an outdoor heat exchanger; a throttling device connected between one end of the indoor heat exchanger and one end of the outdoor heat exchanger to change the pressure of the refrigerant; a gas-liquid separation component, one end of which is connected to the air intake port, and the gas-liquid separator is used to separate the gaseous refrigerant and the liquid refrigerant; a four-way valve, which is respectively connected to the other end of the gas-liquid separation component, the air exhaust port, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger, so as to form a refrigerant flow supply. cooling circulation loop; the gas-liquid separation component comprises: a gas-liquid separator, which is connected between the compressor and the four-way valve; a heat exchanger, which is arranged around the outside of the gas-liquid separator to exchange heat with the gas-liquid separator; wherein the heat exchanger is connected to one end of the indoor heat exchanger or one end of the outdoor heat exchanger, and the air-conditioning system is configured as follows: when the difference between the outlet temperature value of the gas-liquid separator and the saturation temperature value corresponding to the outlet pressure value of the gas-liquid separator is less than or equal to a preset value, the refrigerant flows through the heat exchanger.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a cooling mode of an air conditioning system according to Embodiment 1 of the present utility model;

[0020] Figure 2 is a schematic diagram of a heating mode of an air conditioning system according to Embodiment 1 of the present utility model;

[0021] Figure 3 is a schematic diagram of a cooling mode of an air conditioning system according to Embodiment 2 of the present utility model;

[0022] Figure 4 is a schematic diagram of a heating mode of an air conditioning system according to Embodiment 2 of the present utility model;

[0023] Figure 5 It is a structural schematic diagram of a gas-liquid separation component according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 100. Air conditioning system;

[0026] 11. Compressor; 12. Indoor heat exchanger; 13. Outdoor heat exchanger; 14. Throttling device; 15. Four-way valve; 16. Temperature sensor; 17. Pressure sensor;

[0027] 20. Gas-liquid separation component; 21. Gas-liquid separator; 22. Heat exchange component;

[0028] 31. First branch; 32. Second branch; 33. Third branch; 34. Fourth branch; 35. First control valve; 36. Second control valve; 37. Third control valve; 38. Fourth control valve; 39. Fifth control valve;

[0029] 41. Seventh control valve; 42. Fifth branch; 43. Sixth branch; 44. Eighth control valve; 45. Seventh branch; 46. Eighth branch. DETAILED DESCRIPTION

[0030] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0031] Reference below Figure 1-Figure 5An air conditioning system 100 according to an embodiment of the present invention is described.

[0032] The air conditioning system 100 of the embodiment of the utility model comprises: a compressor 11 , an indoor heat exchanger 12 , an outdoor heat exchanger 13 , a throttling device 14 , a gas-liquid separation component 20 and a four-way valve 15 .

[0033] The compressor 11 has an air intake port and an air discharge port. The compressor 11 is a driven fluid machine that raises low-pressure gas to high-pressure gas and is the heart of the refrigeration system. It inhales low-temperature and low-pressure gaseous refrigerant from the air intake pipe, compresses it by driving the piston through the operation of the motor, and discharges high-temperature and high-pressure liquid refrigerant to the exhaust pipe, providing power for the refrigeration cycle.

[0034] And, taking the refrigeration condition as an example, the compressor 11 is responsible for sucking in low-temperature and low-pressure gaseous refrigerant from the air intake port, compressing it by driving the piston through the operation of the motor, and then discharging high-temperature and high-pressure liquid refrigerant to the exhaust port. In this process, the refrigerant forms a high and low pressure difference in the pipeline, thereby realizing the refrigeration cycle, that is, compression → condensation (heat release) → expansion → evaporation (heat absorption).

[0035] The specific types of refrigerants include Freon (R-22, R-134a, R-410A, etc.), ammonia, hydrocarbons (such as R600a, R290, R170, etc.), carbon dioxide (CO2), etc.

[0036] The throttling device 14 is connected between one end of the indoor heat exchanger 12 and one end of the outdoor heat exchanger 13 to change the pressure of the refrigerant. The throttling device 14 is a device for adjusting the flow of the refrigerant. It mainly plays the role of throttling and reducing pressure by changing the pressure. Generally, there is a variable caliber inside the device. When the refrigerant enters, its pressure will make the caliber smaller, thereby reducing the flow; when the refrigerant leaves, the pressure will make the caliber larger, thereby increasing the flow. Therefore, it can effectively reduce the power consumption of the air conditioning system 100 and reduce the cost of use.

[0037] The throttling device 14 may be an electronic expansion valve, a thermal expansion valve or a capillary tube.

[0038] The throttling device 14 with the best electronic expansion valve adjustment accuracy can detect and collect data on multiple parameters such as the temperature difference between the inlet and outlet air of the air conditioner, the return air temperature and its set value according to the operation requirements of the air-conditioning system 100. After processing by a microcomputer, it automatically controls the opening of the electronic expansion valve, thereby accurately controlling the flow rate of the refrigerant in the air-conditioning system 100, so as to maintain the refrigeration cycle in the best state.

[0039] The thermal expansion valve mainly senses the refrigerant superheat through the evaporator temperature sensor, thereby adjusting the valve opening of the expansion valve. When the superheat is high, it means that the evaporation is sufficient, the refrigerant has become gaseous, and there is still overheating. At this time, the pressure in the diaphragm cavity increases, which in turn pushes the valve stem downward and eventually increases the valve opening; if the superheat is low, it means that the evaporation is not sufficient. At this time, the pressure in the diaphragm cavity decreases, and the diaphragm pushes the valve body upward, thereby reducing the valve opening.

[0040] The capillary tube is the throttling device 14 with the lowest cost and the simplest structure. The capillary tube itself has a small aperture. When the refrigerant flows through the capillary tube, it needs to overcome the resistance in the pipe, which will produce a certain pressure drop. The smaller the pipe diameter and the longer the pipe length, the greater the pressure drop. Therefore, its regulating function is mainly controlled by the length of the pipe.

[0041] One end of the gas-liquid separation component 20 is connected to the air inlet, and the gas-liquid separation component 20 is used to separate gaseous refrigerant and liquid refrigerant. The gas-liquid separation component 20 can be used to prevent the liquid refrigerant from causing liquid hammer to the compressor 11, ensuring the safe and normal operation of the compressor 11. In addition, the gas-liquid separation component 20 can provide additional internal volume for the low-pressure side of the air-conditioning system 100, which is used to temporarily store excess liquid refrigerant and prevent excess liquid refrigerant from flowing into the compressor 11.

[0042] The working principle of the gas-liquid separation component 20 is mainly based on the density difference between gas and liquid and the fluid dynamics effect. When gas and liquid are mixed and flow, due to the density difference, the liquid will settle at the bottom to form a liquid phase, while the gas will be located at the top to form a gas phase, thereby achieving the separation of gas and liquid.

[0043] The four-way valve 15 is respectively connected to the other end of the gas-liquid separation component 20, the exhaust port, the other end of the indoor heat exchanger 12, and the other end of the outdoor heat exchanger 13, thereby forming a cooling circulation loop for the flow of refrigerant. By reversing the four-way valve 15, the flow direction of the refrigerant can be switched, and then the operation mode of the system can be switched.

[0044] Taking the refrigeration condition as an example, when the air-conditioning system 100 is working, the gaseous refrigerant is discharged from the compressor 11 and enters the outdoor heat exchanger 13 through the four-way valve 15 for condensation heat exchange and then becomes liquid. The liquid refrigerant after heat exchange passes through the throttling and pressure reduction effect of the throttling device 14 and enters the indoor heat exchanger 12 for evaporation heat exchange and then becomes gaseous. The gaseous refrigerant after heat exchange flows through the four-way valve 15 and then enters the gas-liquid separation component 20, and finally flows back to the compressor 11 from the gas-liquid separation component 20, completing a complete refrigeration cycle.

[0045] Taking the heating condition as an example, when the air-conditioning system 100 is working, the gaseous refrigerant is discharged from the compressor 11 and enters the indoor heat exchanger 12 through the four-way valve 15 for condensation heat exchange and then becomes liquid. The liquid refrigerant after heat exchange passes through the throttling and pressure reduction effect of the throttling device 14 and enters the outdoor heat exchanger 13 for evaporation heat exchange and then becomes gaseous. The gaseous refrigerant after heat exchange flows through the four-way valve 15 and then enters the gas-liquid separation component 20, and finally flows back to the compressor 11 from the gas-liquid separation component 20, completing a complete heating cycle.

[0046] Through the above method, the outdoor heat exchanger 13 and the indoor heat exchanger 12 have condensation and evaporation functions respectively. Compared with the existing air-conditioning system 100, in which the same heat exchanger needs to bear the condensation and evaporation functions at the same time in different modes, the requirements for the heat exchanger are reduced and the manufacturing cost of the heat exchanger is saved.

[0047] like Figure 5 As shown, the gas-liquid separation component 20 includes: a gas-liquid separator 21, which is connected between the compressor 11 and the four-way valve 15. The gas-liquid separator 21 can be used to prevent the liquid refrigerant from causing liquid hammer to the compressor 11, ensuring the safe and normal operation of the compressor 11.

[0048] And, if Figure 5 As shown, the gas-liquid separation assembly 20 may include: a heat exchanger 22, which is arranged around the outside of the gas-liquid separator 21 to exchange heat with the gas-liquid separator 21. That is, the heat exchanger 22 is arranged on the outside of the gas-liquid separator 21, wherein the heat exchanger 22 can exchange heat with the gas-liquid separator 21, that is, the heat exchanger 22 is used to achieve the effect of heating the gas-liquid separator 21, so that the liquid refrigerant in the gas-liquid separator 21 can be heated into a gaseous refrigerant, and then re-enter the compressor 11 through the air intake port.

[0049] Among them, when the outdoor ambient temperature is low, the gaseous refrigerant will be re-liquefied after pre-cooling, so that the gas-liquid separator 21 cannot normally separate the gas-liquid refrigerant. The liquid refrigerant is very likely to accumulate in the gas-liquid separator 21 and enter the compressor 11 from the air outlet pipe, causing liquid hammer in the compressor 11. At this time, the controller of the air-conditioning system 100 can control the operation of the heat exchange element 22, and the heat exchange element 22 can exchange heat with the gas-liquid separator 21, so that the heated gas-liquid separator 21 heats and vaporizes the liquid refrigerant inside it, and the vaporized refrigerant enters the compressor 11 again.

[0050] According to the embodiment of the utility model, the heat exchanger 22 is connected to one end of the indoor heat exchanger 12 or one end of the outdoor heat exchanger 13 to exchange heat through the refrigerant and the gas-liquid separator 21. That is to say, in the cooling mode or the heating mode, the heat exchanger 22 will appropriately adjust the circulation amount of the introduced refrigerant within the prescribed conditions, heat the liquid refrigerant inside the gas-liquid separator 21, and convert it into a gaseous form, so as to ensure that the refrigerant at the outlet of the gas-liquid separator 21, i.e., the air intake of the compressor 11, always maintains a reasonable positive superheat, i.e., is basically in a gaseous form, thereby avoiding the occurrence of liquid hammer under different working conditions, especially in low temperature environments.

[0051] At the same time, the refrigerant introduced in this part is further cooled after heat exchange, resulting in further increase in the supercooling degree of the air-conditioning system 100 after condensation. While ensuring the operating reliability and life of the air-conditioning system 100 in any operating conditions, the overall performance and energy efficiency of the air-conditioning system 100 can be further improved.

[0052] Therefore, in the cooling or heating mode, the refrigerant will flow into the heat exchange element 22 and heat the liquid refrigerant inside the gas-liquid separator 21, converting it into a gaseous form, ensuring that the refrigerant at the outlet of the gas-liquid separator 21, i.e., the suction port of the compressor 11, always maintains a reasonable positive superheat, i.e., basically in a gaseous form, thereby avoiding the occurrence of liquid hammer under different working conditions, especially in low temperature environments.

[0053] Refer to the following Figure 1-Figure 2 , describing the first embodiment of the utility model:

[0054] Reference Figure 1 and Figure 2 As shown, the air conditioning system 100 may include: a first branch 31, the first branch 31 is connected between the indoor heat exchanger 12 and one end of the heat exchanger 22. That is, the first branch 31 is provided between the indoor heat exchanger 12 and the heat exchanger 22, that is, the first branch 31 can communicate the indoor heat exchanger 12 and the heat exchanger 22.

[0055] In this way, when the air-conditioning system 100 is in the heating mode, the gaseous refrigerant is discharged from the compressor 11 and enters the indoor heat exchanger 12 through the four-way valve 15 for condensation and heat exchange and then becomes liquid. Part of the liquid refrigerant passes through the throttling device 14, and the other part of the liquid refrigerant enters the heat exchange element 22 through the first branch 31. The liquid refrigerant exchanges heat with the heat exchange element 22 and the gas-liquid separator 21, so that the liquid refrigerant in the gas-liquid separator 21 can be heated by the medium-temperature and medium-pressure liquid refrigerant, so that the liquid refrigerant in the gas-liquid separator 21 becomes gaseous refrigerant and flows back to the air intake of the compressor 11.

[0056] Reference Figure 1 and Figure 2As shown, the air conditioning system 100 may include: a second branch 32, one end of the second branch 32 is connected to the other end of the heat exchanger 22, and the other end is connected between the indoor heat exchanger 12 and the throttling device 14. That is, the other part of the liquid refrigerant after heat exchange with the heat exchanger 22 is merged with the part of the liquid refrigerant flowing through the throttling device 14 through the second branch 32, and enters the outdoor heat exchanger 13 for evaporation heat exchange, and enters the gas-liquid separator 21 through the four-way valve 15. Among them, the refrigerant entering the gas-liquid separator 21 is gas-liquid two-phase.

[0057] In addition, refer to Figure 1 and Figure 2 As shown, a first control valve 35 is provided on the first branch 31, and a second control valve 36 and a third control valve 37 are provided in series on the second branch 32. The first control valve 35 and the second control valve 36 are both solenoid valves, that is, the first control valve 35 and the second control valve 36 can be controlled by electrical signals.

[0058] For example, when the air-conditioning system 100 is in heating mode and the compressor 11 of the air-conditioning system 100 is at risk of liquid hammer, the controller of the air-conditioning system 100 controls the first control valve 35 and the second control valve 36 to open, so that the first branch 31 and the second branch 32 can be connected, and the medium-cooled and medium-pressure liquid refrigerant flowing out of the indoor heat exchanger 12 can flow into the heat exchange element 22 through the first branch 31. After achieving heat exchange with the gas-liquid separator 21, the medium-temperature and medium-pressure liquid refrigerant flows to the outdoor heat exchanger 13 through the second branch 32.

[0059] In addition, a third control valve 37 is also provided on the second branch 32, and the third control valve 37 is connected to the other end of the heat exchange element 22. First, the third control valve 37 can be an electronic expansion valve, that is, the controller of the air-conditioning system 100 can automatically control the opening of the electronic expansion valve, so as to accurately control the flow rate of the refrigerant flowing through the heat exchange element 22, so as to select different refrigerant flows according to different heating requirements of different gas-liquid separators 21.

[0060] And, if Figure 1 and Figure 2 As shown, the air conditioning system 100 may include: a third branch 33, and the third branch 33 is connected between the outdoor heat exchanger 13 and one end of the heat exchanger 22. That is, the third branch 33 is provided between the indoor heat exchanger 12 and the heat exchanger 22, that is, the third branch 33 can communicate the indoor heat exchanger 12 and the heat exchanger 22.

[0061] In this way, when the air-conditioning system 100 is in the cooling mode, the gaseous refrigerant is discharged from the compressor 11 and enters the outdoor heat exchanger 13 through the four-way valve 15 for condensation and heat exchange and then becomes liquid. Part of the liquid refrigerant passes through the throttling device 14, and the other part of the liquid refrigerant enters the heat exchange element 22 through the third branch 33. The liquid refrigerant exchanges heat with the heat exchange element 22 and the gas-liquid separator 21, so that the liquid refrigerant in the gas-liquid separator 21 can be heated by the medium-temperature and medium-pressure liquid refrigerant, so that the liquid refrigerant in the gas-liquid separator 21 becomes gaseous refrigerant and flows back to the air intake of the compressor 11.

[0062] Reference Figure 1 and Figure 2 As shown, the air conditioning system 100 may include: a fourth branch 34, one end of the fourth branch 34 is connected to the other end of the heat exchanger 22, and the other end is connected between the outdoor heat exchanger 13 and the throttling device 14. That is, the other part of the liquid refrigerant after heat exchange with the heat exchanger 22 is merged with the part of the liquid refrigerant flowing through the throttling device 14 through the fourth branch 34, and enters the indoor heat exchanger 12 for evaporation heat exchange, and enters the gas-liquid separator 21 through the four-way valve 15. Among them, the refrigerant entering the gas-liquid separator 21 is gas-liquid two-phase.

[0063] Reference Figure 1 and Figure 2 As shown, a fourth control valve 38 is provided on the third branch 33, and a fifth control valve 39 and a sixth control valve connected in series are provided on the fourth branch 34. The fourth control valve 38 and the fifth control valve 39 are both solenoid valves, that is, the fourth control valve 38 and the fifth control valve 39 can be controlled by electrical signals.

[0064] For example, when the air-conditioning system 100 is in cooling mode and the compressor 11 of the air-conditioning system 100 is at risk of liquid hammer, the controller of the air-conditioning system 100 controls the fourth control valve 38 and the fifth control valve 39 to open, so that the third branch 33 and the fourth branch 34 can be connected, and the medium-temperature and medium-pressure liquid refrigerant flowing out of the outdoor heat exchanger 13 can flow into the heat exchange element 22 through the third branch 33. After achieving heat exchange with the gas-liquid separator 21, the medium-temperature and medium-pressure liquid refrigerant flows to the indoor heat exchanger 12 through the fourth branch 34.

[0065] In addition, a sixth control valve is also provided on the fourth branch 34, and the sixth control valve is connected to the other end of the heat exchange element 22. First, the sixth control valve can be an electronic expansion valve, that is, the controller of the air-conditioning system 100 can automatically control the opening of the electronic expansion valve, so as to accurately control the flow rate of the refrigerant flowing through the heat exchange element 22, so as to select different refrigerant flows according to different heating requirements of different gas-liquid separators 21.

[0066] In addition, the third control valve 37 and the sixth control valve can be one, that is, one end of the second branch 32 and one end of the fourth branch 34 are connected to a main circuit, one end of the main circuit is connected to the other end of the heat exchanger 22, and the other end of the main circuit is connected to one end of the second branch 32 and one end of the fourth branch 34, so that only one control valve needs to be set on the main circuit.

[0067] Reference Figure 1 As shown, the cooling mode of the first embodiment of the utility model is as follows:

[0068] The high-temperature and high-pressure gas compressed by the compressor 11 enters the outdoor heat exchanger 13 and condenses into a medium-temperature and high-pressure liquid. Thereafter, when the conditions are met, it is divided into two branches for operation. One branch passes through the fourth control valve 38 and the gas-liquid separator 21 to heat the liquid refrigerant inside. The amount of refrigerant flowing through is controlled by the sixth control valve and is merged into the refrigerant main line through the fifth control valve 39. After being throttled by the throttling device 14, it becomes a low-temperature and low-pressure liquid and evaporates in the indoor heat exchanger 12 to become a low-temperature and low-pressure gas. Subsequently, it is rotated and separated by the gas-liquid separator 21, and the gaseous refrigerant part finally returns to the compressor 11 to complete the heating cycle.

[0069] In the cooling mode, the first control valve 35 and the second control valve 36 are always in a closed state.

[0070] Reference Figure 2 As shown, the heating mode of the first embodiment of the present utility model is as follows:

[0071] After being compressed by the compressor 11, the refrigerant becomes a high-temperature and high-pressure gas, passes through the four-way valve 15 in the powered-on state, enters the indoor heat exchanger 12, and is condensed into a medium-temperature and high-pressure liquid. Thereafter, when the conditions are met, it is divided into two routes for operation, one of which passes through the first control valve 35 and passes through the gas-liquid separator 21 to heat the liquid refrigerant inside it. The amount of refrigerant flowing through it is controlled by the third control valve 37 and is merged into the refrigerant main route through the second control valve 36. After being throttled by the throttling device 14, it becomes a low-temperature and low-pressure liquid, and evaporates in the indoor heat exchanger 12 to become a low-temperature and low-pressure gas. Subsequently, it is rotated and separated by the gas-liquid separator 21, and the gaseous refrigerant part finally returns to the compressor 11 to complete the heating cycle.

[0072] In the heating mode, the fourth control valve 38 and the fifth control valve 39 are always in a closed state.

[0073] Refer to the following Figure 3-Figure 4 , describing the second embodiment of the utility model:

[0074] like Figure 3 and Figure 4As shown, the air conditioning system 100 may include: a seventh control valve 41, the seventh control valve 41 includes: a first valve port, a second valve port and a third valve port, the third valve port is selectively connected to the first valve port or the second valve port, and the third valve port is connected to one end of the heat exchanger 22. In addition, the air conditioning system 100 may include: a fifth branch 42 and a sixth branch 43, the fifth branch 42 is connected between the indoor heat exchanger 12 and the first valve port, and the sixth branch 43 is connected between the outdoor heat exchanger 13 and the second valve port.

[0075] That is, the seventh control valve 41 is connected between one end of the heat exchanger 22 and the indoor heat exchanger 12 or the outdoor heat exchanger 13. That is, the seventh control valve 41 can control the fifth branch 42 to communicate with the heat exchanger 22, or control the sixth branch 43 to communicate with the heat exchanger 22.

[0076] And, if Figure 3 and Figure 4 As shown, the air conditioning system 100 may include: an eighth control valve 44 , the eighth control valve 44 includes: a fourth valve port, a fifth valve port and a sixth valve port, the sixth valve port is selectively connected to the fourth valve port or the fifth valve port, and the sixth valve port is connected to one end of the heat exchange element 22 .

[0077] In addition, the air-conditioning system 100 may include: a seventh branch 45 and an eighth branch 46, one end of the seventh branch 45 is connected to the fourth valve port, and the other end of the seventh branch 45 is connected between the indoor heat exchanger 12 and the throttling device 14; one end of the eighth branch 46 is connected to the fifth valve port, and the other end of the eighth branch 46 is connected between the outdoor heat exchanger 13 and the throttling device 14.

[0078] That is, one end of the eighth control valve 44 is connected to one end of the heat exchanger 22, and the other end of the eighth control valve 44 is connected between the indoor heat exchanger 12 and the throttling device 14 or between the outdoor heat exchanger 13 and the throttling device 14. That is, the seventh control valve 41 can control the seventh branch 45 to be connected to the heat exchanger 22, or control the eighth branch 46 to be connected to the heat exchanger 22.

[0079] In addition, the seventh control valve 41 and the eighth control valve 44 may be three-way proportional valves, that is, the seventh control valve 41 and the eighth control valve 44 may not only control conductance but also control flow rate.

[0080] And, the first valve port of the seventh control valve 41 is Figure 3 and Figure 4 a in the figure, the second valve port of the seventh control valve 41 is Figure 3 and Figure 4 b in the figure, the third valve port of the seventh control valve 41 is Figure 3 and Figure 4 c in the figure, the first valve port of the eighth control valve 44 is Figure 3 and Figure 4 d in the figure, the second valve port of the eighth control valve 44 is Figure 3 and Figure 4 e in the figure, the third valve port of the eighth control valve 44 is Figure 3 and Figure 4 f in.

[0081] Reference Figure 3 As shown, the cooling mode of the second embodiment of the present utility model is as follows:

[0082] At this time, the second valve port and the third valve port of the seventh control valve 41 are connected, and the second valve port and the third valve port of the eighth control valve 44 are connected. The high-temperature and high-pressure gas compressed by the compressor 11 enters the outdoor heat exchanger 13 to condense into a medium-temperature and high-pressure liquid. After that, it is divided into two routes when the conditions are met. One branch passes through the seventh control valve 41, passes through the gas-liquid separator 21, heats the liquid refrigerant inside it, and passes through the eighth control valve 44 to merge into the refrigerant main route. After throttling by the throttling device 14, it becomes a low-temperature and low-pressure liquid, and evaporates in the indoor heat exchanger 12 to become a low-temperature and low-pressure gas. Subsequently, it passes through the gas-liquid separator 21 for rotation separation, and the gaseous refrigerant part finally returns to the compressor 11 to complete the heating cycle.

[0083] Reference Figure 4 As shown, the heating mode of the second embodiment of the present utility model is as follows:

[0084] At this time, the first valve port and the third valve port of the seventh control valve 41 are connected, and the first valve port and the third valve port of the eighth control valve 44 are connected. After being compressed by the compressor 11, the refrigerant becomes a high-temperature and high-pressure gas, passes through the four-way valve 15 in the power-on state, enters the indoor heat exchanger 12 to condense into a medium-temperature and high-pressure liquid, and then runs in two ways when the conditions are met. One branch passes through the seventh control valve 41, passes through the gas-liquid separator 21, heats the liquid refrigerant inside it, and passes through the eighth control valve 44 to merge into the refrigerant main road, and becomes a low-temperature and low-pressure liquid after being throttled by the throttling device 14, and evaporates in the indoor heat exchanger 12 to become a low-temperature and low-pressure gas, and then passes through the gas-liquid separator 21 for rotation separation, and the gaseous refrigerant part finally returns to the compressor 11 to complete the heating cycle.

[0085] In addition, combined Figure 1-Figure 4 As shown, a temperature sensor 16 and a pressure sensor 17 are provided between one end of the gas-liquid separator 21 and the air inlet of the compressor 11. The temperature sensor 16 is used to obtain the temperature of one end of the gas-liquid separator 21, and the temperature sensor 16 is used to obtain the pressure of one end of the gas-liquid separator 21. The temperature sensor 16 and the pressure sensor 17 are both provided at the outlet of the gas-liquid separator 21. The temperature and pressure of the refrigerant at the outlet of the gas-liquid separator 21 can be obtained through the temperature sensor 16 and the pressure sensor 17, so that the operation of the above-mentioned valve group can be controlled by the temperature and pressure of the refrigerant.

[0086] Among them, Figure 5 As shown, the heat exchanger 22 is a spiral heat exchange tube and a copper tube. That is, a group of threaded heat exchange tubes are embedded in the lower half shell of the gas-liquid separator 21, so that the heat exchanger 22 is tightly combined with the gas-liquid separator 21, thereby improving the heat exchange effect between the gas-liquid separator 21 and the heat exchanger 22. Among them, the threaded heat exchange tube is an internally threaded copper tube, which has a high heat transfer coefficient and a good heat exchange effect.

[0087] And, the gas-liquid separator 21 is an aluminum gas-liquid separator 21. That is, the aluminum gas-liquid separator 21 has a higher heat transfer coefficient, so when the heat exchange element 22 exchanges heat with the gas-liquid separator 21, heat is more likely to flow from the heat exchange element 22 to the gas-liquid separator 21, thereby improving the heating effect of the gas-liquid separator 21.

[0088] The air conditioning system 100 according to the second embodiment of the utility model includes: a compressor 11, an indoor heat exchanger 12, an outdoor heat exchanger 13, a throttling device 14, a gas-liquid separation component 20 and a four-way valve 15.

[0089] The compressor 11 has an air intake port and an air discharge port. The compressor 11 is a driven fluid machine that raises low-pressure gas to high-pressure gas and is the heart of the refrigeration system. It inhales low-temperature and low-pressure gaseous refrigerant from the air intake pipe, compresses it by driving the piston through the operation of the motor, and discharges high-temperature and high-pressure liquid refrigerant to the exhaust pipe, providing power for the refrigeration cycle.

[0090] The throttling device 14 may be an electronic expansion valve, a thermal expansion valve or a capillary tube.

[0091] One end of the gas-liquid separation component 20 is connected to the air inlet, and the gas-liquid separator 21 is used to separate the gaseous refrigerant and the liquid refrigerant. The gas-liquid separator 21 can be used to prevent the liquid refrigerant from causing liquid hammer to the compressor 11, thereby ensuring the safe and normal operation of the compressor 11. In addition, the gas-liquid separator 21 can provide additional internal volume for the low-pressure side of the air-conditioning system 100, which is used to temporarily store excess liquid refrigerant and prevent excess liquid refrigerant from flowing into the compressor 11.

[0092] The four-way valve 15 is respectively connected to the other end of the gas-liquid separation component 20, the exhaust port, the other end of the indoor heat exchanger 12, and the other end of the outdoor heat exchanger 13, thereby forming a cooling circulation loop for the flow of refrigerant. By reversing the four-way valve 15, the flow direction of the refrigerant can be switched, and then the operation mode of the system can be switched.

[0093] The gas-liquid separation assembly 20 includes: a gas-liquid separator 21 and a heat exchanger 22, the gas-liquid separator 21 is connected between the compressor 11 and the four-way valve 15, and the heat exchanger 22 is arranged around the outside of the gas-liquid separator 21 to exchange heat with the gas-liquid separator 21. That is, the heat exchanger 22 is arranged on the outside of the gas-liquid separator 21, wherein the heat exchanger 22 can exchange heat with the gas-liquid separator 21, that is, the heat exchanger 22 is used to achieve the effect of heating the gas-liquid separator 21, so that the liquid refrigerant in the gas-liquid separator 21 can be heated into a gaseous refrigerant, and then re-enter the compressor 11 through the air intake port.

[0094] Among them, when the outdoor ambient temperature is low, the gaseous refrigerant will be re-liquefied after pre-cooling, so that the gas-liquid separator 21 cannot normally separate the gas-liquid refrigerant. The liquid refrigerant is very likely to accumulate in the gas-liquid separator 21 and enter the compressor 11 from the air outlet pipe, causing liquid hammer in the compressor 11. At this time, the controller of the air-conditioning system 100 can control the operation of the heat exchange element 22, and the heat exchange element 22 can exchange heat with the gas-liquid separator 21, so that the heated gas-liquid separator 21 heats and vaporizes the liquid refrigerant inside it, and the vaporized refrigerant enters the compressor 11 again.

[0095] In which, the heat exchange element 22 is connected to one end of the indoor heat exchanger 12 or one end of the outdoor heat exchanger 13, and the air-conditioning system 100 is configured as follows: when the difference between the outlet temperature value of the gas-liquid separator 21 and the saturation temperature value corresponding to the outlet pressure value of the gas-liquid separator 21 is less than or equal to a preset value, the refrigerant flows through the heat exchange element 22.

[0096] The difference between the outlet temperature value of the gas-liquid separator 21 and the saturation temperature value corresponding to the outlet pressure value of the gas-liquid separator 21 is the suction superheat.

[0097] That is, A=T1-T2, T1 is the temperature value detected by the temperature sensor 16, and T2 is the saturation temperature value corresponding to the pressure detected by the pressure sensor 17.

[0098] In heating mode: when A is less than or equal to a preset value, the first control valve 35 and the second control valve 36 are opened;

[0099] When the first control valve 35 and the second control valve 36 are opened, the third control valve 37 is opened synchronously and controlled, and the opening degree is controlled according to the target suction superheat: assuming the target suction superheat is B, B=(T3-7)*0.04+(20-T4)*0.07+1, where T3 is the outdoor ambient temperature and T4 is the indoor ambient temperature.

[0100] The opening of the third control valve 37 is automatically controlled according to the difference between the current suction superheat A and the target suction superheat B until the target suction superheat A state is reached.

[0101] When A is greater than a preset value, the first control valve 35 and the second control valve 36 are closed, and the third control valve 37 is closed synchronously;

[0102] In cooling mode: when A is less than or equal to a preset value, the fourth control valve 38 and the fifth control valve 39 are opened;

[0103] When the fourth control valve 38 and the fifth control valve 39 are opened, the sixth control valve is opened synchronously and the opening degree is controlled according to the target suction superheat: assuming the target suction superheat is B, B=(T3-7)*0.04+(20-T4)*0.07+1, where T3 is the outdoor ambient temperature and T4 is the indoor ambient temperature.

[0104] The opening of the sixth control valve is automatically controlled according to the difference between the current suction superheat A and the target suction superheat B until the target suction superheat A state is reached.

[0105] When A is greater than the preset value, the fourth control valve 38 and the fifth control valve 39 are closed, and the sixth control valve is closed synchronously. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0106] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0107] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioning system, comprising: A compressor having a suction port and a discharge port; Indoor heat exchanger; Outdoor heat exchanger; A throttling device connected between one end of the indoor heat exchanger and one end of the outdoor heat exchanger to change the pressure of the refrigerant; A gas-liquid separation component, one end of which is connected to the air intake port, and the gas-liquid separation component is used to separate gaseous refrigerant and liquid refrigerant; A four-way valve is respectively connected to the other end of the gas-liquid separation component, the exhaust port, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger, thereby forming a cooling circulation loop for the flow of refrigerant; Characterized in that the gas-liquid separation component comprises: A gas-liquid separator connected between the compressor and the four-way valve; A heat exchange element, the heat exchange element is arranged around the outside of the gas-liquid separator to exchange heat with the gas-liquid separator; Wherein, the heat exchange element is connected to one end of the indoor heat exchanger or one end of the outdoor heat exchanger to exchange heat with the gas-liquid separator through the refrigerant.

2. The air conditioning system according to claim 1, characterized in that: Also includes: A first branch connected between the indoor heat exchanger and one end of the heat exchange element; The second branch has one end connected to the other end of the heat exchange element, and the other end connected between the indoor heat exchanger and the throttling device.

3. The air conditioning system according to claim 2, characterized in that: The first branch is provided with a first control valve, the second branch is provided with a second control valve and a third control valve connected in series with each other, and the third control valve is connected to the other end of the heat exchange element.

4. The air conditioning system according to claim 1, characterized in that: Also includes: A third branch is connected between the outdoor heat exchanger and one end of the heat exchange element; A fourth branch has one end connected to the other end of the heat exchange element, and the other end connected between the outdoor heat exchanger and the throttling device.

5. The air conditioning system according to claim 4, characterized in that: The third branch is provided with a fourth control valve, the fourth branch is provided with a fifth control valve and a sixth control valve connected in series with each other, and the sixth control valve is connected to the other end of the heat exchange element.

6. The air conditioning system according to claim 1, characterized in that: Also includes: a seventh control valve, comprising: a first valve port, a second valve port and a third valve port, wherein the third valve port is selectively connected to the first valve port or the second valve port, and the third valve port is connected to one end of the heat exchange element; a fifth branch, connected between the indoor heat exchanger and the first valve port; The sixth branch is connected between the outdoor heat exchanger and the second valve port.

7. The air conditioning system according to claim 1, characterized in that: Also includes: an eighth control valve, comprising: a fourth valve port, a fifth valve port and a sixth valve port, wherein the sixth valve port is selectively connected to the fourth valve port or the fifth valve port, and the sixth valve port is connected to one end of the heat exchange element; a seventh branch, one end of which is connected to the fourth valve port, and the other end of which is connected between the indoor heat exchanger and the throttling device; The eighth branch has one end connected to the fifth valve port, and the other end connected between the outdoor heat exchanger and the throttling device.

8. The air conditioning system according to claim 1, characterized in that: A temperature sensor and a pressure sensor are provided between one end of the gas-liquid separator and the air intake port of the compressor, wherein the temperature sensor is used to obtain the temperature of one end of the gas-liquid separator, and the temperature sensor is used to obtain the pressure of one end of the gas-liquid separator.

9. The air conditioning system according to claim 1, characterized in that: The heat exchange element is a spiral heat exchange tube and a copper tube; and, The gas-liquid separator is an aluminum gas-liquid separator.

10. An air conditioning system, comprising: A compressor having a suction port and a discharge port; Indoor heat exchanger; Outdoor heat exchanger; A throttling device connected between one end of the indoor heat exchanger and one end of the outdoor heat exchanger to change the pressure of the refrigerant; A gas-liquid separation component, one end of which is connected to the air intake port, and the gas-liquid separation component is used to separate gaseous refrigerant and liquid refrigerant; A four-way valve is respectively connected to the other end of the gas-liquid separation component, the exhaust port, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger, thereby forming a cooling circulation loop for the flow of refrigerant; Characterized in that the gas-liquid separation component comprises: A gas-liquid separator connected between the compressor and the four-way valve; A heat exchange element, the heat exchange element is arranged around the outside of the gas-liquid separator to exchange heat with the gas-liquid separator; In which, the heat exchange element is connected to one end of the indoor heat exchanger or one end of the outdoor heat exchanger, and the air-conditioning system is configured as follows: when the difference between the outlet temperature value of the gas-liquid separator and the saturation temperature value corresponding to the outlet pressure value of the gas-liquid separator is less than or equal to a preset value, the refrigerant flows through the heat exchange element.

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