Air conditioning system

Abstract

The air conditioning system comprises an outdoor unit and an indoor unit, and a compressor and an outdoor heat exchanger are arranged in the outdoor unit; an indoor heat exchanger is arranged in the indoor unit, the indoor heat exchanger is connected with the compressor and the outdoor heat exchanger through an air pipe and a liquid pipe to form a refrigerant circulation loop, the indoor unit further comprises a gas-liquid separation device, the gas-liquid separation device is provided with a liquid inlet pipe, a liquid outlet pipe and an air outlet pipe, the liquid inlet pipe is connected with the liquid pipe, and the liquid outlet pipe is connected with a liquid pipe connector of the indoor heat exchanger. The air outlet pipe is connected with the air pipe. According to the air conditioning system, the gas-liquid separation device is arranged, refrigerants from the liquid pipe enter the gas-liquid separation device from the liquid inlet pipe, the gaseous refrigerants can be discharged into the air pipe from the air outlet pipe, only the liquid refrigerants enter the indoor heat exchanger from the liquid outlet pipe, and it is guaranteed that the liquid proportion in the refrigerants entering the indoor unit is greatly increased; the indoor refrigerating capacity is guaranteed, and the refrigerant sound of the indoor unit is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioners. Background Art

[0002] According to the refrigeration principle of air conditioning, liquid refrigerant completes evaporation and heat absorption in the indoor unit, and the indoor temperature is reduced. In order to ensure a good indoor cooling effect, the refrigerant entering the indoor unit is preferably in a completely liquid state. Because gaseous refrigerant cannot smoothly complete evaporation and heat absorption like liquid refrigerant. If gaseous refrigerant is mixed with liquid refrigerant entering the indoor unit, the cooling capacity will be reduced, and as the proportion of gaseous refrigerant, that is, the dryness, increases, the cooling capacity attenuation will be more serious. In addition, when mixed with gaseous refrigerant, the gas will form bubbles, and the bubbles will continuously impact the valve needle of the electronic expansion valve of the throttling component of the indoor unit with the flow of refrigerant, causing a certain vibration, which will lead to the appearance of refrigerant sound, causing certain troubles to users.

[0003] In order to ensure that the refrigerant entering the indoor unit during cooling is completely liquid, the common solution in the industry is to increase the subcooling degree of the outdoor unit refrigerant. Therefore, additional subcooling components need to be added to the system configuration, which is costly and can only ensure that the refrigerant is in a supercooled state, that is, completely liquid, when it leaves the outdoor unit. If the indoor unit is far away and the online piping is long, the subcooling degree of the supercooling state will slowly decrease due to the resistance loss along the pipeline. When the subcooling degree drops to zero, the liquid refrigerant will begin to partially transform into a gaseous state, that is, the so-called flash evaporation will occur in the online piping. When the flash evaporation phenomenon is serious, it will cause a higher content of gaseous refrigerant entering the indoor unit, affecting the indoor cooling effect and generating refrigerant noise. Summary of the invention

[0004] The utility model aims at the problem in the prior art that when the refrigerant in the oil-mixed gas state enters the throttling component of the indoor unit, the impact on the valve needle causes vibration and noise, and proposes an air conditioning system to solve the above problem.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0006] An air conditioning system comprises an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a compressor and an outdoor heat exchanger; the indoor unit is provided with an indoor heat exchanger, and the indoor heat exchanger is connected to the compressor and the outdoor heat exchanger through an air pipe and a liquid pipe respectively to form a refrigerant circulation loop, and the indoor unit further comprises:

[0007] The gas-liquid separation device comprises a liquid inlet pipe, a liquid outlet pipe and an air outlet pipe, wherein the liquid inlet pipe is connected to the liquid pipe, the liquid outlet pipe is connected to the liquid pipe interface of the indoor heat exchanger, and the air outlet pipe is connected to the air pipe.

[0008] In some embodiments, the indoor unit further includes:

[0009] An indoor throttling device is connected between the gas-liquid separation device and the liquid pipe interface of the indoor heat exchanger.

[0010] In some embodiments, the gas-liquid separation device comprises:

[0011] A shell, wherein an inner cavity is defined in the shell, and the liquid inlet pipe, the air outlet pipe and the liquid outlet pipe are respectively connected to the inner cavity;

[0012] The air outlet pipe is arranged at the upper end of the shell, and a one-way valve is arranged in the air outlet pipe for one-way conduction from the inside of the inner cavity to the outside;

[0013] The liquid outlet pipe is arranged at the lower end of the shell, and the liquid inlet pipe is located between the air outlet pipe and the liquid outlet pipe.

[0014] In some embodiments, the one-way valve comprises:

[0015] A valve seat, which is fixed in the air outlet pipe, and the valve seat is provided with valve holes penetrating both sides;

[0016] A valve core is movably disposed in the air outlet pipe and is disposed on a side of the valve seat facing the external connection port of the air outlet pipe, and the valve core is used to block or open the valve hole;

[0017] A limiting mechanism is provided on the inner side wall of the air outlet pipe close to its external connection port, which is used to limit the valve core.

[0018] In some embodiments, one end of the gas outlet pipe extends from the top of the shell into the inner cavity, and the gas-liquid separation device further includes:

[0019] An automatic exhaust valve is arranged in the inner cavity, and the automatic exhaust valve includes a sealing portion that can float up and down with the liquid level in the inner cavity, and the sealing portion is located directly below the outlet pipe. When the sealing portion floats upward, at least a portion of the sealing portion penetrates into the lower end pipe opening of the outlet pipe to block the outlet pipe. When the sealing portion floats downward, the sealing portion is detached from the lower end pipe opening of the outlet pipe to open the outlet pipe.

[0020] In some embodiments, the automatic exhaust valve further comprises:

[0021] A support portion, one end of which is rotatably connected to the wall of the inner cavity, and the blocking portion is fixed to the upper end surface of the support portion;

[0022] The floating part is arranged at the free end of the supporting part. The floating part can float up and down with the liquid level, thereby driving the supporting part to rotate around the axis. The blocking part moves up and down with the rotation of the supporting part to block or open the air outlet pipe.

[0023] In some embodiments, the liquid inlet pipe includes a main body and a liquid discharge nozzle, and the liquid discharge nozzle extends into the inner cavity from one side of the shell. A protrusion is formed on the inner wall of the shell on the side opposite to the liquid inlet pipe, and the protrusion is provided with a shaft hole along the horizontal direction. The root of the support portion is connected to a shaft, and the shaft is inserted into the shaft hole.

[0024] In some embodiments, the floating portion is located below the liquid inlet pipe, and can float up and down along with the liquid level in the space below the liquid inlet pipe.

[0025] In some embodiments, the liquid discharge nozzle and the main body are not located on the same axis.

[0026] In some embodiments, the air conditioning system includes a plurality of indoor units, and each indoor unit is provided with a gas-liquid separation device.

[0027] Compared with the prior art, the advantages and positive effects of the utility model are:

[0028] The air-conditioning system of the utility model is provided with a gas-liquid separation device, the liquid inlet pipe of the gas-liquid separation device is connected with the liquid pipe of the system, the liquid outlet pipe of the gas-liquid separation device is connected with the liquid pipe interface of the indoor heat exchanger, the air outlet pipe of the gas-liquid separation device is connected with the air pipe, the refrigerant from the liquid pipe enters the gas-liquid separation device from the liquid inlet pipe, the gaseous refrigerant is discharged into the air pipe from the air outlet pipe, and only the liquid refrigerant enters the indoor heat exchanger from the liquid outlet pipe, thereby ensuring that the proportion of liquid in the refrigerant entering the indoor unit is greatly increased, thereby ensuring the indoor cooling capacity and improving the refrigerant noise of the indoor unit.

[0029] In addition, the gaseous refrigerant is discharged into the air pipe through the outlet pipe, which will increase the refrigerant content in the air pipe. This part of the refrigerant enters the compressor suction port with the system circulation, thereby increasing the mass flow rate of the compressor suction port, improving the compressor suction utilization rate, and energy efficiency.

[0030] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a principle diagram of an embodiment of the air conditioning system proposed by the utility model;

[0033] Figure 2 It is a structural schematic diagram of a gas-liquid separation device in an embodiment of the air conditioning system proposed by the utility model;

[0034] Figure 3 yes Figure 2 A magnified view of part A in FIG.

[0035] Figure 4 This is a state schematic diagram of the gas-liquid separation device of the air conditioning system proposed by the utility model;

[0036] Figure 5 This is another state schematic diagram of the gas-liquid separation device of the air conditioning system proposed by the utility model;

[0037] Figure 6 It is a structural schematic diagram of a liquid inlet pipe of a gas-liquid separation device of an air conditioning system proposed by the utility model;

[0038] Figure 7 It is a schematic diagram of the relative position structure of the liquid inlet pipe and the automatic exhaust valve of the gas-liquid separation device of the air-conditioning system proposed by the utility model;

[0039] Figure 8 It is a principle diagram of another embodiment of the air conditioning system proposed by the utility model;

[0040] Fig. 9 It is a principle diagram of another embodiment of the air conditioning system proposed by the utility model;

[0041] Fig.10 It is a principle diagram of another embodiment of the air conditioning system proposed by the utility model. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] <Basic operating principle of air conditioner>

[0046] In the present application, the air conditioning system performs the refrigerant cycle of the system by using a compressor, a condenser, an electronic expansion valve and an evaporator. The refrigerant cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat exchanged.

[0047] The compressor compresses the refrigerant gas at low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0048] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0049] The outdoor unit of the air conditioner refers to a part of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0050] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0051] <Composition of indoor unit>

[0052] Reference Figure 1 As shown, the air conditioning system in some embodiments of the present application includes an indoor unit 11 installed in an indoor space. The indoor unit 11 is connected to an outdoor unit 12 installed in an outdoor space through a pipe. An indoor heat exchanger 113 and an indoor throttling device are provided in the indoor unit 11. An indoor fan may also be provided in the indoor unit.

[0053] <Outdoor unit components>

[0054] The outdoor unit 12 may be provided with a compressor 121, an outdoor heat exchanger 122, an outdoor fan (not shown), an expansion device and similar components of a refrigeration cycle. The indoor heat exchanger 113 is connected to the compressor 121 and the outdoor heat exchanger 122 through an air pipe 13 and a liquid pipe 14, respectively, to form a refrigerant circulation loop.

[0055] In some embodiments, the liquid pipe interface of the indoor heat exchanger 113 is connected to the outdoor heat exchanger 122 through the liquid pipe 14 , and the gas pipe interface of the indoor heat exchanger 113 is connected to the exhaust port of the compressor 121 .

[0056] In some embodiments, such as Figure 1-Figure 3 As shown, the indoor unit 11 also includes a gas-liquid separation device 111, which has a liquid inlet pipe 1111, a liquid outlet pipe 1112 and an air outlet pipe 1113, the liquid inlet pipe 1111 is connected to the liquid pipe 14, the liquid outlet pipe 1112 is connected to the liquid pipe interface of the indoor heat exchanger 113, and the air outlet pipe 1113 is connected to the air pipe 13.

[0057] When the air conditioning system works in cooling mode, the compressor 121 compresses the refrigerant gas in a low temperature and low pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas enters the outdoor heat exchanger 122 through the four-way valve 15. The outdoor heat exchanger 122 condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0058] The outdoor heat exchanger discharges the liquid refrigerant into the liquid pipe 14, and flows to the indoor unit, first entering the gas-liquid separation device 111 of the indoor unit, and the refrigerant mixed with the gas enters the gas-liquid separation device 111 from the liquid inlet pipe 1111. In the gas-liquid separation device 111, the gaseous refrigerant will be discharged into the air pipe 13 from the air outlet pipe 1113, and only the liquid refrigerant enters the indoor heat exchanger 113 from the liquid outlet pipe 1112. The liquid refrigerant absorbs heat from the surrounding environment in the indoor heat exchanger 113 to evaporate, and is converted into gas again. After flowing out of the indoor heat exchanger 113, it enters the air pipe 13, flows toward the outdoor unit, and returns to the compressor 121 again through the four-way valve 15.

[0059] The air-conditioning system of this embodiment is provided with a gas-liquid separation device 111, the liquid inlet pipe 1111 of the gas-liquid separation device is connected to the liquid pipe 14 of the system, the liquid outlet pipe 1112 is connected to the liquid pipe interface of the indoor heat exchanger 113, and the air outlet pipe 1113 is connected to the air pipe 13. When the air-conditioning system works in the cooling mode, the refrigerant from the liquid pipe 14 enters the gas-liquid separation device 111 from the liquid inlet pipe 1111, and the gaseous refrigerant in the gas-liquid separation device 111 is discharged into the air pipe 13 from the air outlet pipe 1113, and only the liquid refrigerant enters the indoor heat exchanger 113 from the liquid outlet pipe 1112, thereby ensuring that the proportion of liquid in the refrigerant entering the indoor unit 11 is greatly increased, thereby ensuring the indoor cooling capacity and improving the refrigerant noise of the indoor unit 11.

[0060] In addition, the gaseous refrigerant is discharged into the air pipe 13 through the air outlet pipe 1113, which will increase the refrigerant content in the air pipe 13. This part of the refrigerant enters the air intake port of the compressor 121 along with the system circulation, thereby increasing the mass flow rate of the air intake port of the compressor 121, improving the air intake utilization rate of the compressor 121, and improving energy efficiency.

[0061] In some embodiments, such as Figure 8 As shown, the indoor unit 11 also includes an indoor throttling device 112 , and the indoor throttling device 112 is connected between the gas-liquid separation device 111 and the liquid pipe interface of the indoor heat exchanger 113 .

[0062] When the air-conditioning system operates in cooling mode, the refrigerant from the liquid pipe 14 enters the gas-liquid separation device 111 from the liquid inlet pipe 1111, and the gaseous refrigerant in the gas-liquid separation device 111 will be discharged into the gas pipe 13 from the air outlet pipe 1113. Only the liquid refrigerant enters the indoor heat exchanger 113 from the liquid outlet pipe 1112 after throttling and reducing the pressure through the indoor throttling device 112 to evaporate and absorb heat. Since there is no disturbance of the gaseous refrigerant, no bubbles will flow with the refrigerant to impact the valve needle of the indoor throttling device 112, thereby avoiding the occurrence of refrigerant noise.

[0063] In some embodiments, such as Figure 2As shown, the gas-liquid separation device 11 includes a shell 1114, and an inner cavity 1115 is defined in the shell 1114. The liquid inlet pipe 1111, the gas outlet pipe 1113 and the liquid outlet pipe 1112 are respectively connected to the inner cavity 1115. When the air-conditioning system works in the cooling mode, the refrigerant entering the gas-liquid separation device 111 will first gather in the inner cavity 1115. Under the action of gravity, the liquid refrigerant moves downward to accumulate, and the gaseous refrigerant rises and is located above the liquid refrigerant, thereby achieving gas-liquid separation.

[0064] In order to allow the separated gaseous refrigerant to be discharged smoothly from the inner cavity 1115, in some embodiments, according to the distribution characteristics of the gaseous refrigerant in the inner cavity 1115, the outlet pipe 1113 is set at the upper end of the shell 1114, and the gaseous refrigerant located above can be smoothly discharged from the outlet pipe 1113 to the air pipe 13.

[0065] In order to prevent the pressure of the air pipe from being too high, causing the refrigerant in the air pipe to flow back into the liquid pipe 14, in some embodiments, such as Figure 2 , Figure 3 As shown, a one-way valve 1116 is provided in the air outlet pipe 1113 for one-way communication from the inside of the inner cavity 1115 to the outside. The one-way valve 1116 can conduct the air outlet pipe 1113 in one direction, that is, the refrigerant in the inner cavity 1115 can enter the air pipe 13 in one direction, while the refrigerant in the air pipe 13 cannot enter the inner cavity 1115.

[0066] The liquid refrigerant entering the inner cavity 1115 gathers at the bottom of the inner cavity 11115 under the action of its own gravity. In order to facilitate the discharge of the liquid refrigerant at the bottom from the liquid outlet pipe 1112 to the liquid pipe 14, in some embodiments, the liquid outlet pipe 1112 is arranged at the lower end of the shell 1114, and the liquid refrigerant at the bottom can be discharged smoothly from the liquid outlet pipe 1112.

[0067] In order to prevent the refrigerant from being retained in the inner cavity 1115, in some embodiments, the liquid outlet pipe 1112 is arranged at the bottom of the shell 1114, and the liquid outlet pipe 1112 extends downward from the bottom of the shell 1114 for a certain distance and then bends toward one side, and is connected to the liquid pipe interface of the indoor heat exchanger 113 through a connecting pipe. With this arrangement, the discharge rate of the liquid refrigerant in the inner cavity 1115 can be improved, and the refrigerant can be prevented from being retained in the inner cavity 1115.

[0068] In order to facilitate gas-liquid separation of the refrigerant entering the inner cavity 1115 from the liquid inlet pipe 1111, in some embodiments, the liquid inlet pipe 1111 is located between the gas outlet pipe 1113 and the liquid outlet pipe 1112. The refrigerant enters the inner cavity 1115 from the liquid inlet pipe 1111. The liquid refrigerant has a large density and converges to the lower part of the inner cavity 1115 and is discharged through the liquid outlet pipe 1112 located below. The gaseous refrigerant has a small density and converges to the upper part of the inner cavity 1115 and is discharged through the gas outlet pipe 1113 located above.

[0069] In some embodiments, the one-way valve 1116 includes a valve seat 11161 , which is fixed in the air outlet pipe 1113 , and a valve hole 11163 penetrating both sides of the valve seat 11161 is formed.

[0070] The one-way valve 1116 also includes a valve core 11162, which is movably arranged in the air outlet pipe 1113, and the valve core 11162 is located on the side of the valve seat 11161 facing the external connection port of the air outlet pipe 1113, and the valve core 11162 is used to block or open the valve hole 11163.

[0071] The gaseous refrigerant in the inner cavity 1115 can push up the valve core 11162 to move toward one side of the external connection port of the outlet pipe 1113, open the valve hole 11163, and discharge the gaseous refrigerant into the air pipe 13.

[0072] When the refrigerant in the air pipe 13 enters the one-way valve 1116, the valve core 11162 is pushed toward the valve hole 11163, and the valve core 11162 blocks the valve hole 11163. The refrigerant in the air pipe 13 cannot enter the inner cavity 1115 through the one-way valve 1116, thereby achieving one-way conduction.

[0073] A limiting mechanism 11131 is provided on the inner wall of the air outlet pipe 1113 near its external connection port for limiting the position of the valve core 11162 .

[0074] In some embodiments, one end of the air outlet pipe 1113 extends from the top of the shell 1114 into the inner cavity 1115 to facilitate the discharge of the gaseous refrigerant.

[0075] like Figure 4 , Figure 5 As shown, in order to ensure the safe operation of the air-conditioning system and prevent the liquid refrigerant in the inner cavity 1115 from being discharged into the air outlet pipe 1113 through the air outlet pipe 1113, which may easily cause liquid hammer problems in the compressor 121 as the refrigerant circulates. In some embodiments, the gas-liquid separation device 111 also includes an automatic exhaust valve 1117, which is arranged in the inner cavity 1115. The automatic exhaust valve 1117 can automatically close and block the air outlet pipe 1113 when the liquid level of the liquid refrigerant in the inner cavity 1115 rises to a certain height, thereby preventing the liquid refrigerant from being discharged into the air outlet pipe 1113 through the air outlet pipe 1113.

[0076] like Figure 4 As shown, when the liquid level of the liquid refrigerant in the inner cavity 1115 is lower than the set height, the automatic exhaust valve 1117 opens the outlet pipe 1113, and the gaseous refrigerant can be discharged into the outlet pipe 1113 normally through the outlet pipe 1113.

[0077] In some embodiments, the automatic exhaust valve 1117 includes a blocking portion 11171 that can float up and down with the liquid level in the inner cavity 1115. The blocking portion 11171 is located directly below the outlet pipe 1113. If more liquid refrigerant accumulates in the inner cavity 1115, when the liquid level in the inner cavity 1115 rises, the blocking portion 11171 floats upward with the liquid level. When the liquid level rises to a certain height, such as Figure 5 As shown, at least part of the blocking portion 11171 extends into the lower end of the outlet pipe 1113 to block the outlet pipe 1113. Therefore, the liquid refrigerant in the inner cavity 1115 cannot enter the air pipe 13 through the outlet pipe 1113, thereby ensuring the safe operation of the compressor 121.

[0078] When the liquid level in the inner cavity 1115 decreases and the blocking portion 11171 moves downward with the liquid level, the blocking portion 11171 detaches from the lower end of the air outlet pipe 1113 to open the air outlet pipe 1113, thereby ensuring the exhaust function of the air outlet pipe 1113.

[0079] In order to limit the movement path of the blocking portion 11171 within a certain range when it floats up and down with the liquid level, and to ensure that it can accurately penetrate into the lower port of the air outlet pipe 1113 when floating up, thereby effectively blocking the air outlet pipe 1113, in some embodiments, the automatic exhaust valve 1117 also includes a support portion 11172, one end of the support portion 11172 is rotatably connected to the inner wall of the inner cavity 1115, and the blocking portion 11171 is fixed on the upper end surface of the support portion 11172.

[0080] When the liquid level in the inner cavity 1115 rises, the support part 11172 rotates around the axis under the action of buoyancy, and has a vertical motion component, which can drive the blocking part 11171 to float upward, and the movement path of the blocking part 11171 is limited, ensuring that each time the blocking part 11171 moves to a certain height, at least part of the blocking part 11171 accurately penetrates into the lower end of the air outlet pipe 1113, so as to block the air outlet pipe 1113.

[0081] In order to increase the buoyancy of the support portion 11172 so that it has sufficient force to support the sealing portion 11171 when the liquid level reaches a certain height, the automatic exhaust valve 1117 also includes a floating portion 11173. The floating portion 11173 is arranged at the free end of the support portion 11172. The floating portion 11173 can float up and down with the liquid level, thereby driving the support portion 11172 to rotate around the axis. The sealing portion 11171 moves up and down with the rotation of the support portion 11172, so as to block or open the exhaust pipe 1113.

[0082] In some embodiments, the floating portion 11173 is spherical, which increases the contact area between the floating portion 11173 and the liquid, thereby helping to improve buoyancy.

[0083] In some embodiments, such as Figure 6 As shown, the liquid inlet pipe 1111 includes a main body 11111 and a liquid discharge nozzle 11112, the liquid discharge nozzle 11112 extends from one side of the housing 1114 into the inner cavity 1115, a protrusion 1118 is formed on the inner wall of the housing 1114 on the side opposite to the liquid inlet pipe 1111, and the protrusion 1118 is provided with a shaft hole (not shown in the figure) in the transverse direction, and the root of the support portion 11172 is connected to a shaft 1119, and the shaft 1119 penetrates into the shaft hole. The support portion 11172 can rotate around the shaft 1119.

[0084] In order to further facilitate the gas-liquid separation of the refrigerant entering the inner cavity 1115, in some embodiments, the liquid inlet pipe 1111 is arranged at the upper middle part of the shell 1114. It can provide enough inner cavity 1115 space below the liquid inlet pipe 1111 for gathering liquid refrigerant, so that more gaseous refrigerant can be separated and move upward as it enters the inner cavity 1115. It avoids the technical problem that if the setting height of the liquid inlet pipe 1111 is too low, the refrigerant liquid level gathered in the inner cavity 1115 exceeds the liquid inlet pipe 1111, and the gaseous refrigerant is mixed in the liquid refrigerant in the form of bubbles, which is not conducive to separation and there is an incomplete separation.

[0085] Since the space below the liquid inlet pipe 1111 is larger, a larger movement space can be provided for the floating portion 11173. In some embodiments, the floating portion 11173 is located below the liquid inlet pipe 1111 and can float up and down in the space below the liquid inlet pipe 1111 with the liquid level.

[0086] The air conditioning system in this embodiment adds an automatic exhaust valve between the air pipe and the liquid pipe of the indoor unit, and utilizes the automatic exhaust characteristic of the automatic exhaust valve. When the refrigerant mixed with gas passes through the automatic exhaust valve, the gas is discharged into the air pipe through the outlet pipe 1113 (liquid pipe pressure>air pipe pressure). After the gas is discharged, the liquid directly or indirectly pushes the blocking part up to block the outlet pipe 1113. In this way, it can be ensured that the proportion of liquid in the refrigerant entering the indoor unit is greatly increased, the indoor cooling capacity is guaranteed, and the refrigerant sound of the indoor unit is improved. In addition, the gas is discharged into the air pipe through the automatic exhaust valve, which is bound to increase the refrigerant content of the air pipe, and this part of the refrigerant enters the compressor suction port with the system circulation, thereby increasing the mass flow rate of the compressor suction port, improving the compressor suction utilization rate, and improving energy efficiency.

[0087] In order to prevent the refrigerant discharged from the discharge nozzle 1112 into the inner cavity 1115 from directly impacting the floating part 11173, causing the floating part 11173 to drive the blocking part 11171 to move up and down repeatedly, frequently switching to open and block the outlet pipe 1113, and reducing the exhaust capacity, in some embodiments, such as Figure 6 , Figure 7As shown, the discharge nozzle 11112 and the main body 11111 are not located on the same axis. The discharge nozzle 11112 avoids the floating part 11173, and the refrigerant discharged into the inner cavity 1115 cannot impact the floating part 11173, thereby solving the above series of problems.

[0088] In addition, the discharge nozzle 11112 and the main body 11111 are not located on the same axis, which can further improve the gas-liquid separation efficiency entering the inner cavity 1115. By setting the discharge nozzle 11112 and the main body 11111 not to be located on the same axis, the path between the refrigerant discharged from the discharge nozzle 11112 and the liquid outlet pipe 1112 can be extended, so that before the refrigerant discharged from the discharge nozzle 11112 enters the liquid outlet pipe 1112, more gaseous refrigerant bubbles are separated and rise from the mixed liquid.

[0089] In some embodiments, a second gas-liquid separator 17 is connected to the front end of the air intake of the compressor 121, which is used to separate the refrigerant entering the compressor 121 into gas and liquid, so that only the gaseous refrigerant enters the compressor 121, thereby avoiding the occurrence of liquid hammer caused by the liquid refrigerant entering the compressor 121.

[0090] Embodiment 2. In some embodiments, the gas-liquid separation device 111 can also be arranged between the gas pipe and the liquid pipe of the outdoor unit, and is used to separate the gaseous refrigerant in the liquid pipe of the outdoor unit and discharge it into the gas pipe when the air-conditioning system is heating, thereby achieving the practical purpose of reducing the noise of the outdoor unit.

[0091] In some embodiments, the gas-liquid separation device 111 is disposed at the front end of the outdoor throttling device 16 , and is used to separate the bubbles mixed in the refrigerant to avoid the noise caused by the gaseous refrigerant impacting the valve core of the outdoor throttling device 16 .

[0092] The connection mode and noise reduction principle of the gas-liquid separation device 111 in the outdoor unit are similar to the setting mode of the indoor unit in the first embodiment, and will not be described in detail here.

[0093] Embodiment 3, in some embodiments, as Fig. 9 , Fig.10 As shown, the air conditioning system includes a plurality of indoor units, each of which is provided with a gas-liquid separation device 111 .

[0094] The outdoor unit 12 may be provided with a compressor 121, an outdoor heat exchanger 122, an outdoor fan (not shown), an expansion device and similar components of a refrigeration cycle. Both ends of the indoor heat exchanger 113 are connected to the gas pipe 13 and the liquid pipe 14 through connecting branches, and the other ends of the gas pipe 13 and the liquid pipe 14 are connected to the compressor 121 and the outdoor heat exchanger 122, respectively, to form a refrigerant circulation loop.

[0095] In some embodiments, the gas-liquid separation device 111 has a liquid inlet pipe 1111, a liquid outlet pipe 1112 and an air outlet pipe 1113, the liquid inlet pipe 1111 is connected to the liquid pipe 14, the liquid outlet pipe 1112 is connected to the liquid pipe interface of the indoor heat exchanger 113, and the air outlet pipe 1113 is connected to the air pipe 13.

[0096] When the air conditioning system works in cooling mode, the compressor 121 compresses the refrigerant gas in a low temperature and low pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas enters the outdoor heat exchanger 122 through the four-way valve 15. The outdoor heat exchanger 122 condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0097] The outdoor heat exchanger discharges the liquid refrigerant into the liquid pipe 14 and flows to the indoor unit. For the multi-split system, the refrigerant in the liquid pipe 14 flows to each powered-on indoor unit. The refrigerant in the liquid pipe 14 first enters the gas-liquid separation device 111 of the indoor unit, and the refrigerant mixed with the gas enters the gas-liquid separation device 111 from the liquid inlet pipe 1111. In the gas-liquid separation device 111, the gaseous refrigerant will be discharged from the gas outlet pipe 1113 into the gas pipe 13, and only the liquid refrigerant enters the indoor heat exchanger 113 from the liquid outlet pipe 1112. The liquid refrigerant absorbs the heat from the surrounding environment in the indoor heat exchanger 113 to evaporate, and is converted into gas again. After flowing out of the indoor heat exchanger 113, it merges into the gas pipe 13, flows toward the outdoor unit, and returns to the compressor 121 again through the four-way valve 15.

[0098] The air-conditioning system of this embodiment is provided with a gas-liquid separation device 111, the liquid inlet pipe 1111 of the gas-liquid separation device is connected to the liquid pipe 14 of the system, the liquid outlet pipe 1112 is connected to the liquid pipe interface of the indoor heat exchanger 113, and the air outlet pipe 1113 is connected to the air pipe 13. When the air-conditioning system works in the cooling mode, the refrigerant from the liquid pipe 14 enters the gas-liquid separation device 111 from the liquid inlet pipe 1111, and the gaseous refrigerant in the gas-liquid separation device 111 is discharged into the air pipe 13 from the air outlet pipe 1113, and only the liquid refrigerant enters the indoor heat exchanger 113 from the liquid outlet pipe 1112, thereby ensuring that the proportion of liquid in the refrigerant entering the indoor unit 11 is greatly increased, thereby ensuring the indoor cooling capacity and improving the refrigerant noise of the indoor unit 11.

[0099] In addition, the gaseous refrigerant is discharged into the air pipe 13 through the air outlet pipe 1113, which will increase the refrigerant content in the air pipe 13. This part of the refrigerant enters the air intake port of the compressor 121 along with the system circulation, thereby increasing the mass flow rate of the air intake port of the compressor 121, improving the air intake utilization rate of the compressor 121, and improving energy efficiency.

[0100] In some embodiments, each indoor unit 11 further includes an indoor throttling device 112 , and the indoor throttling device 112 is connected between the gas-liquid separation device 111 of the indoor unit and the liquid pipe interface of the indoor heat exchanger 113 .

[0101] When the air-conditioning system operates in cooling mode, the refrigerant from the liquid pipe 14 enters the gas-liquid separation device 111 from the liquid inlet pipe 1111, and the gaseous refrigerant in the gas-liquid separation device 111 will be discharged into the gas pipe 13 from the air outlet pipe 1113. Only the liquid refrigerant enters the indoor heat exchanger 113 from the liquid outlet pipe 1112 after throttling and reducing the pressure through the indoor throttling device 112 to evaporate and absorb heat. Since there is no disturbance of the gaseous refrigerant, no bubbles will flow with the refrigerant to impact the valve needle of the indoor throttling device 112, thereby avoiding the occurrence of refrigerant noise.

[0102] In some embodiments, as shown in the figure, the gas-liquid separation device 11 includes a shell 1114, and an inner cavity 1115 is defined in the shell 1114. The liquid inlet pipe 1111, the gas outlet pipe 1113 and the liquid outlet pipe 1112 are respectively connected to the inner cavity 1115. When the air-conditioning system works in the cooling mode, the refrigerant entering the gas-liquid separation device 111 will first gather in the inner cavity 1115. Under the action of gravity, the liquid refrigerant moves downward to accumulate, and the gaseous refrigerant rises and is located above the liquid refrigerant, thereby achieving gas-liquid separation.

[0103] In order to allow the separated gaseous refrigerant to be discharged smoothly from the inner cavity 1115, in some embodiments, according to the distribution characteristics of the gaseous refrigerant in the inner cavity 1115, the outlet pipe 1113 is set at the upper end of the shell 1114, and the gaseous refrigerant located above can be smoothly discharged from the outlet pipe 1113 to the air pipe 13.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0106] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioning system, comprising an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a compressor and an outdoor heat exchanger; the indoor unit is provided with an indoor heat exchanger, and the indoor heat exchanger is connected to the compressor and the outdoor heat exchanger through an air pipe and a liquid pipe respectively to form a refrigerant circulation loop, characterized in that: The indoor unit further comprises: The gas-liquid separation device comprises a liquid inlet pipe, a liquid outlet pipe and an air outlet pipe, wherein the liquid inlet pipe is connected to the liquid pipe, the liquid outlet pipe is connected to the liquid pipe interface of the indoor heat exchanger, and the air outlet pipe is connected to the air pipe.

2. The air conditioning system according to claim 1, characterized in that: The indoor unit further comprises: An indoor throttling device is connected between the gas-liquid separation device and the liquid pipe interface of the indoor heat exchanger.

3. The air conditioning system according to claim 1, characterized in that: The gas-liquid separation device comprises: A shell, wherein an inner cavity is defined in the shell, and the liquid inlet pipe, the air outlet pipe and the liquid outlet pipe are respectively connected to the inner cavity; The air outlet pipe is arranged at the upper end of the shell, and a one-way valve is arranged in the air outlet pipe for one-way conduction from the inside of the inner cavity to the outside; The liquid outlet pipe is arranged at the lower end of the shell, and the liquid inlet pipe is located between the air outlet pipe and the liquid outlet pipe.

4. The air conditioning system according to claim 3, characterized in that: The one-way valve comprises: A valve seat, which is fixed in the air outlet pipe, and the valve seat is provided with valve holes penetrating both sides; A valve core, which is movably arranged in the air outlet pipe, and the valve core is located on a side of the valve seat facing the external connection port of the air outlet pipe, and the valve core is used to block or open the valve hole; A limiting mechanism is provided on the inner side wall of the air outlet pipe close to its external connection port, which is used to limit the valve core.

5. The air conditioning system according to claim 3, characterized in that: One end of the gas outlet pipe extends from the top of the shell into the inner cavity, and the gas-liquid separation device further includes: An automatic exhaust valve is arranged in the inner cavity, and the automatic exhaust valve includes a sealing portion that can float up and down with the liquid level in the inner cavity, and the sealing portion is located directly below the outlet pipe. When the sealing portion floats upward, at least a portion of the sealing portion penetrates into the lower end pipe opening of the outlet pipe to block the outlet pipe. When the sealing portion moves downward, the sealing portion is detached from the lower end pipe opening of the outlet pipe to open the outlet pipe.

6. The air conditioning system according to claim 5, characterized in that: The automatic exhaust valve also includes: A support portion, one end of which is rotatably connected to the wall of the inner cavity, and the blocking portion is fixed to the upper end surface of the support portion; The floating part is arranged at the free end of the supporting part. The floating part can float up and down with the liquid level, thereby driving the supporting part to rotate around the axis. The blocking part moves up and down with the rotation of the supporting part to block or open the air outlet pipe.

7. The air conditioning system according to claim 6, characterized in that: The liquid inlet pipe includes a main body and a liquid discharge nozzle, and the liquid discharge nozzle extends into the inner cavity from one side of the shell. A protrusion is formed on the inner wall of the shell on the side opposite to the liquid inlet pipe, and the protrusion is provided with a shaft hole along the horizontal direction. The root of the support part is connected to a shaft, and the shaft is inserted into the shaft hole.

8. The air conditioning system according to claim 7, characterized in that: The floating part is located below the liquid inlet pipe, and can float up and down along with the liquid level in the space below the liquid inlet pipe.

9. The air conditioning system according to claim 7, characterized in that: The liquid discharge nozzle and the main body are not located on the same axis.

10. The air conditioning system according to any one of claims 1 to 9, characterized in that: The air conditioning system comprises a plurality of indoor units, each of which is provided with a gas-liquid separation device.

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