Air conditioning system

Abstract

The utility model discloses an air conditioning system which comprises a system loop body which at least comprises a refrigerant loop composed of a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a throttling element. The ejector is arranged on the upstream of the throttling element, an ejection opening of the ejector communicates with an inlet of the throttling element, and a suction inlet of the ejector communicates with the air suction side of the compressor; and the switching valve group is arranged at the upstream of the throttling element and used for switching one of the first heat exchanger and the second heat exchanger to be communicated with the inlet of the ejector and the other one to be communicated with the downstream of the throttling element according to the mode of the air conditioning system. The ejector is additionally arranged, the ejector is a device for ejecting low-pressure fluid through high-pressure fluid and mixing the low-pressure fluid through the effect of the gradually-shrinking and gradually-expanding nozzle in the ejector, and in the circulation process, high-temperature and high-pressure refrigerants at an outlet of the condenser eject low-temperature and low-pressure refrigerants on the air suction side of the compressor in the ejector and are mixed; and therefore, the supercooling degree of the refrigerant in the flow path is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, more particularly, to an air conditioning system. BACKGROUND

[0002] An air conditioning system relies on the evaporation and condensation process of refrigerant to transfer heat and achieve refrigeration and heating functions. The degree of supercooling refers to the extent to which the temperature of refrigerant at the outlet of the condenser is lower than the saturation temperature at the condensing pressure. The degree of supercooling is usually expressed in terms of temperature difference, i.e., the difference between the saturation temperature at the condensing pressure and the liquid temperature at the outlet of the condenser.

[0003] The refrigerant at the outlet of the condenser maintains a high degree of supercooling, which can reduce flash gas, improve unit refrigeration capacity, and enhance system stability. During the throttling process of the throttling device, the supercooled refrigerant can reduce the generation of flash gas, thereby retaining more liquid refrigerant into the evaporator and improving refrigeration efficiency. The enthalpy of the supercooled refrigerant liquid is reduced, and the enthalpy of the refrigerant entering the evaporator after throttling is also reduced, thereby increasing the enthalpy difference between the inlet and outlet of the evaporator and improving the unit refrigeration capacity. Proper supercooling can reduce temperature fluctuations, enabling the air conditioning system to maintain relatively stable performance under different operating conditions and enhancing the reliability of the air conditioning system.

[0004] In terms of improving the degree of supercooling of refrigerant at the outlet of the condenser to optimize the capacity efficiency of the entire machine, the existing technology mainly adopts the strategy of adding a supercooling pipe at the bottom of the condenser or installing a heat recovery device before the throttling device. Although the existing technology improves the degree of supercooling of refrigerant at the outlet of the condenser to some extent by adding a supercooling pipe or a heat recovery device, the effects of these solutions in refrigeration and heating modes are not balanced. Specifically, the existing technology can only achieve high supercooling in a single mode, but performs poorly in the other mode.

[0005] Therefore, how to achieve high supercooling in both refrigeration and heating modes is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENT

[0006] Therefore, the purpose of the present application is to provide an air conditioning system that can achieve high supercooling in both refrigeration and heating modes.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The first aspect of the present application provides an air conditioning system, comprising:

[0009] a system circuit body, at least comprising a refrigerant circuit composed of a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, and a throttling device;

[0010] An ejector is arranged upstream of the throttling device, and a suction port of the ejector is communicated with an inlet of the throttling device, and a spray port of the ejector is communicated with a suction side of the compressor;

[0011] A switching valve group is arranged upstream of the throttling device, and is used to switch one of the first heat exchanger and the second heat exchanger to be communicated with the inlet of the ejector and the other to be communicated downstream of the throttling device according to a mode of the air conditioning system.

[0012] In a possible implementation, the switching valve group comprises:

[0013] A first valve group branch comprises a first pipeline and first and second check valves connected in series on the first pipeline, and the first and second check valves are in a conductive state along a direction from a first end to a second end of the first pipeline;

[0014] A second valve group branch comprises a second pipeline and third and fourth check valves connected in series on the second pipeline, and the third and fourth check valves are in a conductive state along a direction from a first end to a second end of the second pipeline, an outlet of the throttling device is communicated with the first end of the first pipeline and the first end of the second pipeline through pipelines, an inlet of the ejector is communicated with the second end of the first pipeline and the second end of the second pipeline through pipelines, one refrigerant port of the first heat exchanger is communicated with the four-way valve, and the other refrigerant port is communicated with the first pipeline and located between the first and second check valves, one refrigerant port of the second heat exchanger is communicated with the four-way valve, and the other refrigerant port is communicated with the second pipeline and located between the third and fourth check valves.

[0015] In a possible implementation, the first valve port of the four-way valve is communicated with a discharge port of the compressor, the second valve port is communicated with a first refrigerant port of the first heat exchanger, the third valve port is communicated with a first refrigerant port of the second heat exchanger, and the fourth valve port is communicated with a suction port of the compressor;

[0016] When the air conditioning system is in a heating mode, the first valve port and the second valve port of the four-way valve are communicated, and the third valve port and the fourth valve port are communicated;

[0017] When the air conditioning system is in a cooling mode, the first valve port and the third valve port of the four-way valve are communicated, and the second valve port and the fourth valve port are communicated.

[0018] In a possible implementation, the air conditioning system further comprises a proportional three-way regulating valve communicated between the fourth valve port of the four-way valve and the suction port of the compressor;

[0019] The first valve port of the proportional three-way regulating valve is communicated with the fourth valve port of the four-way valve, the second valve port of the proportional three-way regulating valve is communicated with the suction port of the compressor, and the third valve port of the proportional three-way regulating valve is communicated with the suction inlet of the ejector.

[0020] In a possible implementation, the proportional opening degree of the first valve port of the proportional three-way regulating valve to the second valve port and the third valve port of the proportional three-way regulating valve is adjustable.

[0021] In a possible implementation, the air conditioning system further comprises:

[0022] A first pressure sensor is configured to detect the discharge side pressure of the compressor.

[0023] A second pressure sensor is configured to detect the suction side pressure of the compressor, and when the discharge side pressure and the suction side pressure are in a safe operation range, the opening degree of the third valve port of the proportional three-way regulating valve is increased.

[0024] In a possible implementation, the air conditioning system further comprises a temperature pressure sensor configured to detect the supercooling degree of the refrigerant.

[0025] In a possible implementation, the throttling member is an electronic expansion valve or a capillary tube.

[0026] In a possible implementation, the air conditioning system is a fluorine-free household air conditioning system, and the air conditioning system further comprises an indoor side circulation system, the indoor side circulation system comprising an indoor side heat exchanger and a water pump.

[0027] The first heat exchanger is a double-medium heat exchanger, one medium pipeline of the first heat exchanger is communicated with the refrigerant circuit, and the indoor side heat exchanger, the water pump and another medium pipeline of the first heat exchanger are communicated with each other to form an indoor circulation water circuit.

[0028] In a possible implementation, the indoor side circulation system further comprises a buffer water tank, the buffer water tank being communicated between the inlet of the water pump and the first heat exchanger.

[0029] The air conditioning system provided in the application can change the flow direction of the refrigerant through the four-way valve, and then switch the refrigeration and heating modes of the system loop body. In the heating mode, the circulation path of the refrigerant is that the high-temperature and high-pressure refrigerant discharged by the compressor passes through the four-way valve to the first heat exchanger to exchange heat with indoor air, or passes through other heat exchangers to exchange heat with indoor air, to achieve the heating effect. The first heat exchanger is connected to the inlet of the ejector through the action of the switching valve group, the refrigerant passes through the first heat exchanger, and then all flows to the ejector, then is throttled and depressurized by the throttling member, enters the second heat exchanger after passing through the switching valve group, evaporates and absorbs heat, and finally returns to the compressor through the four-way valve to complete the circulation. Since the suction inlet of the ejector is connected to the suction side of the compressor, the low-temperature and low-pressure refrigerant returning to the compressor through the four-way valve is sucked into the ejector by the suction action of the ejector, mixed with the refrigerant at the outlet of the first heat exchanger, and then enters the heating cycle again.

[0030] In the refrigeration mode, the circulation path of the refrigerant is that the high-temperature and high-pressure refrigerant discharged by the compressor passes through the four-way valve to the second heat exchanger to release heat, then the second heat exchanger is connected to the inlet of the ejector through the action of the switching valve group, the refrigerant passes through the second heat exchanger, and then all flows to the ejector, then is throttled and depressurized by the throttling member, enters the first heat exchanger after passing through the switching valve group, evaporates and absorbs heat in the first heat exchanger, exchanges heat with indoor air, or exchanges heat with indoor air through other heat exchangers, to achieve the refrigeration effect, and finally returns to the compressor through the four-way valve to complete the circulation. Since the suction inlet of the ejector is connected to the suction side of the compressor, the low-temperature and low-pressure refrigerant returning to the compressor through the four-way valve is sucked into the ejector by the suction action of the ejector, mixed with the refrigerant at the outlet of the second heat exchanger, and then enters the refrigeration cycle again.

[0031] The air conditioning system provided in the application increases the ejector, which is a device that uses high-pressure fluid to inject low-pressure fluid and mix through the action of the tapered nozzle inside. In the above circulation process, the high-temperature and high-pressure refrigerant at the outlet of the condenser (the condenser is the first heat exchanger in the heating mode and the second heat exchanger in the refrigeration mode) injects the low-temperature and low-pressure refrigerant at the suction side of the compressor in the ejector and mixes, thereby increasing the supercooling degree of the refrigerant in the flow path. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 The system diagram of the air conditioning system disclosed in the embodiments of the present application;

[0034] Figure 2 System diagram of the air conditioning system disclosed in the embodiments of the present application in the heating mode;

[0035] Figure 3 System diagram of the air conditioning system disclosed in the embodiments of the present application in the cooling mode.

[0036] The meanings of the various reference numerals in the drawings are as follows:

[0037] 101 - compressor; 102 - four-way valve; 103 - first heat exchanger; 104 - ejector; 105 - throttling device; 106 - second heat exchanger;

[0038] 201 - buffer water tank; 202 - indoor-side heat exchanger; 203 - water pump;

[0039] 301 - proportional three-way regulating valve; 302 - first pressure sensor; 303 - second pressure sensor; 304 - temperature and pressure sensor;

[0040] 401 - first check valve; 402 - second check valve; 403 - third check valve; 404 - fourth check valve. DETAILED DESCRIPTION

[0041] The core of the present application is to provide an air conditioning system capable of achieving high supercooling degree in both cooling and heating modes.

[0042] Hereinafter, the embodiments will be described with reference to the accompanying drawings. In addition, the embodiments shown below do not have any limiting effect on the application content recited in the claims. Furthermore, the entire contents of the configurations represented in the following embodiments are not limited to what is necessary for the solution of the application recited in the claims. Note that, for the sake of convenience of description, only the parts relevant to the application are shown in the drawings. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0043] In the aspect of improving the supercooling degree of refrigerant at the outlet of the condenser to optimize the capacity efficiency of the entire machine, the prior art mainly adopts the strategy of adding a supercooling pipe at the bottom of the condenser or installing a heat regenerator before the throttling device. Although the prior art improves the supercooling degree of refrigerant at the outlet of the condenser to some extent by adding a supercooling pipe or a heat regenerator, the effects of these schemes in the cooling mode and the heating mode are not balanced. Specifically, they can only achieve high supercooling degree in a single mode, but perform poorly in the other mode.

[0044] Based on this, the embodiments of the present application disclose an air conditioning system capable of guaranteeing high supercooling degree in both the heating mode and the cooling mode, thereby reducing flash gas, improving unit refrigerating capacity, and improving system stability.

[0045] AsFigure 1 As shown, the air conditioning system disclosed in the embodiments of the present application comprises a system loop body, an ejector 104 and a switching valve group. The system loop body is a circulating loop of refrigerant in the air conditioning system. The system loop body at least comprises a refrigerant loop composed of a compressor 101, a four-way valve 102, a first heat exchanger 103, a second heat exchanger 106 and a throttling device 105. The four-way valve 102 is used to switch the exhaust port of the compressor 101 to communicate with one of the first heat exchanger 103 and the second heat exchanger 106, and the other one of the first heat exchanger 103 and the second heat exchanger 106 to communicate with the suction hole of the compressor 101. It should be noted that the throttling device 105 can be an electronic expansion valve or a capillary tube.

[0046] For example, in the heating mode, the exhaust port of the compressor 101 communicates with the first heat exchanger 103, and the second heat exchanger 106 communicates with the suction hole of the compressor 101. In the cooling mode, the exhaust port of the compressor 101 communicates with the second heat exchanger 106, and the first heat exchanger 103 communicates with the suction hole of the compressor 101.

[0047] Those skilled in the art can understand that the heat exchanger communicating with the exhaust port of the compressor 101 is the condenser, the heat exchanger communicating with the suction hole of the compressor 101 is the evaporator, and the throttling device 105 is arranged between the condenser and the evaporator. In the heating mode, the first heat exchanger 103 is the condenser, and the second heat exchanger 106 is the evaporator; in the cooling mode, the second heat exchanger 106 is the condenser, and the first heat exchanger 103 is the evaporator.

[0048] The ejector 104 is arranged upstream of the throttling device 105, i.e. between the condenser and the throttling device 105. The injection port of the ejector 104 communicates with the inlet of the throttling device 105, and the suction port of the ejector 104 communicates with the suction side of the compressor 101. The ejector 104 is used to introduce low-temperature and low-pressure refrigerant upstream of the throttling device 105 to improve the supercooling degree at the outlet of the condenser.

[0049] The switching valve group is arranged upstream of the throttling device 105 and is used to switch one of the first heat exchanger 103 and the second heat exchanger 106 to communicate with the inlet of the ejector 104 and the other one to communicate downstream of the throttling device 105 according to the mode of the air conditioning system. The specific structure of the switching valve group can be arbitrary, as long as it can ensure that in both the cooling mode and the heating mode, the condenser of the first heat exchanger 103 and the second heat exchanger 106 communicates with the inlet of the ejector 104, so that in any mode, low-temperature and low-pressure refrigerant can be introduced downstream of the condenser (i.e. upstream of the throttling device 105).

[0050] The air conditioning system disclosed in the embodiments of the present application can change the flow direction of the refrigerant through the four-way valve 102, and then switch the cooling and heating modes of the system loop body. For example, Figure 2As shown, in the heating mode, the circulating path of the refrigerant is that the high-temperature and high-pressure refrigerant discharged by the compressor 101 passes through the four-way valve 102 to the first heat exchanger 103 to exchange heat with indoor air (for example, the first heat exchanger 103 can be arranged indoors in a common air conditioner to directly exchange heat with indoor air), or exchange heat with indoor air through other heat exchangers (for example, a fluorine non-in-home air conditioning system is provided with an indoor heat exchanger indoors, the indoor heat exchanger exchanges heat with the first heat exchanger 103, and at the same time exchanges heat with indoor air), to achieve the effect of heating. The first heat exchanger 103 is connected to the inlet of the ejector 104 through the switching valve group, and the refrigerant passing through the first heat exchanger 103 all flows to the ejector 104, then is throttled and depressurized through the throttling element 105, enters the second heat exchanger after passing through the switching valve group to evaporate and absorb heat, and finally returns to the compressor 101 through the four-way valve 102 to complete the circulation. Since the suction inlet of the ejector 104 is connected to the suction side of the compressor 101, the low-temperature and low-pressure refrigerant returning to the compressor 101 through the four-way valve 102 is sucked into the ejector 104 by the suction action of the ejector 104, mixes with the refrigerant at the outlet of the first heat exchanger 103, and enters the heating cycle again.

[0051] As shown in the heating mode, Figure 3 As shown, in the heating mode, the circulating path of the refrigerant is that the high-temperature and high-pressure refrigerant discharged by the compressor 101 passes through the four-way valve 102 to the first heat exchanger 103 to exchange heat with indoor air (for example, the first heat exchanger 103 can be arranged indoors in a common air conditioner to directly exchange heat with indoor air), or exchange heat with indoor air through other heat exchangers (for example, a fluorine non-in-home air conditioning system is provided with an indoor heat exchanger indoors, the indoor heat exchanger exchanges heat with the first heat exchanger 103, and at the same time exchanges heat with indoor air), to achieve the effect of heating. The first heat exchanger 103 is connected to the inlet of the ejector 104 through the switching valve group, and the refrigerant passing through the first heat exchanger 103 all flows to the ejector 104, then is throttled and depressurized through the throttling element 105, enters the second heat exchanger after passing through the switching valve group to evaporate and absorb heat, and finally returns to the compressor 101 through the four-way valve 102 to complete the circulation. Since the suction inlet of the ejector 104 is connected to the suction side of the compressor 101, the low-temperature and low-pressure refrigerant returning to the compressor 101 through the four-way valve 102 is sucked into the ejector 104 by the suction action of the ejector 104, mixes with the refrigerant at the outlet of the first heat exchanger 103, and enters the heating cycle again.

[0052] The air conditioning system disclosed in the embodiment of the application is provided with the ejector 104, the ejector 104 is a device for using high-pressure fluid to inject low-pressure fluid and mixing through the action of the gradually tapered and gradually expanded nozzle inside, and in the above circulating process, the high-temperature and high-pressure refrigerant at the outlet of the condenser (the condenser is the first heat exchanger 103 in the heating mode and the second heat exchanger in the cooling mode) injects the low-temperature and low-pressure refrigerant at the suction side of the compressor 101 and mixes in the ejector 104, thereby realizing the increase of the supercooling degree of the refrigerant in the flow path.

[0053] In a specific embodiment of this application, the switching valve group includes a first valve group branch and a second valve group branch. The first valve group branch includes a first pipeline and a first check valve 401 and a second check valve 402 connected in series on the first pipeline. The first check valve 401 and the second check valve 402 are in a conducting state along the direction from the first end to the second end of the first pipeline.

[0054] The second valve group branch includes a second pipeline and a third check valve 403 and a fourth check valve 404 connected in series on the second pipeline. The third check valve 403 and the fourth check valve 404 are in a conducting state along the direction from the first end to the second end of the second pipeline.

[0055] The outlet of the throttling device 105 is connected to the first end of the first pipeline and the second pipeline through a pipeline. The inlet of the ejector 104 is connected to the second end of the first pipeline and the second pipeline through a pipeline. One refrigerant port of the first heat exchanger 103 is connected to the four-way valve 102, and the other refrigerant port is connected to the first pipeline and is located between the first check valve 401 and the second check valve 402. One refrigerant port of the second heat exchanger 106 is connected to the four-way valve 102, and the other refrigerant port is connected to the second pipeline and is located between the third check valve 403 and the fourth check valve 404.

[0056] The switching valve group disclosed in this embodiment does not require reversing or switching, and can still ensure that the condensers in the first heat exchanger 103 and the second heat exchanger 106 are connected to the inlet of the ejector 104.

[0057] like Figure 2 As shown, in heating mode, the refrigerant circulation path is as follows: the compressor 101 discharges high-temperature, high-pressure refrigerant, which passes through the four-way valve 102 to the first heat exchanger 103 to exchange heat with the indoor air, or through other heat exchangers to exchange heat with the indoor air, thus achieving the heating effect. The refrigerant discharged from the first heat exchanger 103 flows to the ejector 104 through the conduction of the first one-way valve 401 and the flow obstruction of the second one-way valve 402. After being throttled and depressurized by the throttling element 105, it passes through the conduction of the fourth one-way valve 404 to the second heat exchanger 106 for evaporation and heat absorption. It should be noted that although the refrigerant flow direction is also the conduction direction of the second one-way valve 402 at this time, the refrigerant here is a low-pressure refrigerant after throttling and depressurization. There is a large pressure difference between this refrigerant and the high-pressure refrigerant before throttling and depressurization on the other side of the second one-way valve 402. At this time, it is impossible to push the valve core of the second one-way valve 402 to open and achieve conduction. Therefore, the refrigerant after throttling and depressurization can only flow to the second heat exchanger 106 through the fourth one-way valve 404. Finally, it returns to the compressor 101 through the four-way valve 102 to complete the cycle. Since the suction port of the ejector 104 is connected to the suction side of the compressor 101, the low-temperature, low-pressure refrigerant returning to the compressor 101 through the four-way valve 102 is drawn into the ejector 104 and mixed with the refrigerant at the outlet of the first heat exchanger 103, and then enters the heating cycle again.

[0058] As Figure 3 shown, in the cooling mode, the circulating path of the refrigerant is that the high-temperature and high-pressure refrigerant discharged by the compressor 101 passes through the four-way valve 102 to the second heat exchanger 106 to release heat, and then all flows to the ejector 104 through the conduction of the third one-way valve 403 and the flow resistance of the fourth one-way valve 404, and then evaporates and absorbs heat to the first heat exchanger 103 through the throttling of the throttling device 105 and the conduction of the second one-way valve 402. It should be noted that at this time, the refrigerant flow direction is also the conduction direction of the fourth one-way valve 404, but the refrigerant here is low-pressure refrigerant after throttling and pressure reduction, and there is a large pressure difference with the high-pressure refrigerant before throttling and pressure reduction on the other side of the fourth one-way valve 404. At this time, the valve core of the fourth one-way valve 404 cannot be pushed to realize conduction, so the refrigerant after throttling and pressure reduction can only flow to the first heat exchanger 103 through the second one-way valve 402. Finally, the low-temperature and low-pressure refrigerant returned to the compressor 101 through the four-way valve 102 is sucked into the ejector 104 by the suction action of the ejector 104, mixed with the refrigerant at the outlet of the second heat exchanger, and enters the refrigeration cycle again.

[0059] In this embodiment, the one-way valve assembly composed of the first one-way valve 401, the second one-way valve 402, the third one-way valve 403 and the fourth one-way valve 404 ensures that the flow path of the refrigerant is the condenser-ejector 104-throttling device 105-evaporator in the cooling and heating modes, and ensures that the ejector 104 is always in a forward running state, realizing effective supercooling in all modes.

[0060] It should be noted that the switching valve group can also be a reversing valve, which can be connected with the four-way valve 102. When the air conditioning system switches between the cooling and heating modes, the switching valve group follows the reversing to switch the connection between the condenser in the first heat exchanger 103 and the second heat exchanger 106 and the inlet of the ejector 104.

[0061] In a specific embodiment of the present application, the four-way valve 102 has four valve ports, which are defined as the first valve port, the second valve port, the third valve port and the fourth valve port. The first valve port of the four-way valve 102 is connected with the exhaust port of the compressor 101, the second valve port of the four-way valve 102 is connected with the first refrigerant port of the first heat exchanger 103, the third valve port of the four-way valve 102 is connected with the first refrigerant port of the second heat exchanger 106, and the fourth valve port of the four-way valve 102 is connected with the suction port of the compressor 101.

[0062] When the air conditioning system is in the heating mode, the first valve port and the second valve port of the four-way valve 102 are communicated, and the third valve port and the fourth valve port are communicated. That is, the exhaust port of the compressor 101 is communicated with the first refrigerant port of the first heat exchanger 103, and the second refrigerant port of the first heat exchanger 103 is communicated between the first one-way valve 401 and the second one-way valve 402. The first refrigerant port of the second heat exchanger 106 is communicated with the suction port of the compressor 101, and the second refrigerant port of the second heat exchanger 106 is communicated between the third one-way valve 403 and the fourth one-way valve 404.

[0063] When the air conditioning system is in the heating mode, the first valve port and the third valve port of the four-way valve 102 are communicated, and the second valve port and the fourth valve port are communicated. That is, the exhaust port of the compressor 101 is communicated with the first refrigerant port of the second heat exchanger 106, and the second refrigerant port of the second heat exchanger 106 is communicated between the third one-way valve 403 and the fourth one-way valve 404. The suction port of the compressor 101 is communicated with the first refrigerant port of the first heat exchanger 103, and the second refrigerant port of the first heat exchanger 103 is communicated between the first one-way valve 401 and the second one-way valve 402.

[0064] In an embodiment of the present application, the air conditioning system can further comprise a proportional three-way regulating valve 301 communicated between the fourth valve port of the four-way valve 102 and the suction port of the compressor 101. The proportional three-way regulating valve 301 has three valve ports, which are defined as a first valve port, a second valve port and a third valve port.

[0065] The first valve port of the proportional three-way regulating valve 301 is communicated with the fourth valve port of the four-way valve 102, the second valve port of the proportional three-way regulating valve 301 is communicated with the suction port of the compressor 101, and the third valve port of the proportional three-way regulating valve 301 is communicated with the suction inlet of the ejector 104. The proportional opening degree of the first valve port of the proportional three-way regulating valve 301 to the second valve port and the third valve port of the proportional three-way regulating valve 301 is adjustable. The first valve port of the proportional three-way regulating valve 301 is the inlet of the proportional three-way regulating valve 301, and the second valve port and the third valve port of the proportional three-way regulating valve 301 are two outlets of the proportional three-way regulating valve 301. The proportional opening degree of the proportional three-way regulating valve 301 is adjustable, that is, the refrigerant entering through the first valve port of the proportional three-way regulating valve 301 can be adjusted according to the demand to adjust the proportion of the refrigerant discharged through the second valve port and the third valve port, and then the low-temperature and low-pressure refrigerant mixed into the ejector 104 can be adjusted.

[0066] From the perspective of pressure values, the pressure on the high-pressure side is higher (i.e., the discharge-side pressure of the compressor 101 is higher), mainly because the compressor 101 compresses the refrigerant, increasing its temperature and pressure, and the refrigerant in this pressure range can effectively dissipate heat in the condenser, releasing heat to the external environment, thereby realizing the conversion of the refrigerant from a gaseous state to a liquid state. The pressure on the low-pressure side is relatively low (i.e., the suction-side pressure of the compressor 101 is low), which helps the refrigerant absorb heat in the evaporator, converting from a liquid state to a gaseous state, achieving the refrigeration effect.

[0067] The difference between the high and low pressures of the air conditioning system plays an important role in air conditioning operation. If the suction-side pressure is too high or too low, it will affect the refrigeration effect. For example, if the suction-side pressure is too low, it may mean that there is not enough refrigerant to fully absorb heat; if the suction-side pressure is too high, it may be a fault or blockage of the throttling component, causing abnormal refrigerant flow. Therefore, it is required that the discharge-side pressure of the compressor 101 and the suction-side pressure of the compressor 101 are within the safe operating range.

[0068] As can be understood by those skilled in the art, increasing the opening degree of the third valve port of the proportional three-way regulating valve 301 will reduce the refrigerant returning to the suction port of the compressor 101, which will inevitably affect the suction-side pressure of the compressor 101.

[0069] In an embodiment of the present application, the air conditioning system can further include a first pressure sensor 302 and a second pressure sensor 303. The first pressure sensor 302 is used to detect the discharge-side pressure of the compressor 101. The second pressure sensor 303 is used to detect the suction-side pressure of the compressor 101. When the discharge-side pressure and the suction-side pressure are within the safe operating range, the opening degree of the third valve port of the proportional three-way regulating valve 301 can be increased to ensure a high degree of supercooling. When the current opening degree of the third valve port of the proportional three-way regulating valve 301 causes the discharge-side pressure and the suction-side pressure to exceed the safe operating range, the opening degree of the third valve port of the proportional three-way regulating valve 301 can be reduced. That is, in this embodiment, when the discharge-side pressure and the suction-side pressure are within the safe operating range, the third valve port of the proportional three-way regulating valve 301 can output the maximum opening degree, i.e., the third valve port of the proportional three-way regulating valve 301 operates at the maximum opening degree, ensuring control of the amount of injection of the ejector 104 and ensuring a high degree of supercooling of the refrigerant. When the ejector 104 is not needed to inject low-temperature and low-pressure refrigerant, the proportional three-way regulating valve 301 can operate in a one-way conduction mode, and the refrigerant flowing out of the four-way valve 102 returns to the compressor 101 through the proportional three-way regulating valve 301.

[0070] Further, the air conditioning system can further include a temperature and pressure sensor 304 for detecting the supercooling degree of the refrigerant. The temperature and pressure sensor 304 can be used to detect the temperature and pressure at the outlet side of the throttling component 105 to obtain the supercooling degree.

[0071] Traditional air conditioning systems rely on the evaporation and condensation process of refrigerant to transfer heat to achieve refrigeration and heating functions, which requires the refrigerant circulation pipeline to extend to the user end. However, this design leads to low integration of the whole machine, large refrigerant charge and potential safety hazards. In contrast, the fluorine does not enter the house air conditioner concentrates the evaporator and condenser of the refrigerant circulation on the outdoor unit side, and transfers the cold or heat to the user end through the circulating water and the refrigerant. This design significantly improves the integration and operation safety of the system.

[0072] The air conditioning system disclosed in the embodiment can be a fluorine does not enter the house air conditioner system, that is, the air conditioning system can also include an indoor side circulation system, which includes an indoor side heat exchanger 202 and a water pump 203.

[0073] Among them, the first heat exchanger 103 is a double medium heat exchanger, that is, the first heat exchanger 103 has two independent medium pipelines, and the two independent medium pipelines exchange heat with each other. One medium pipeline of the first heat exchanger 103 is communicated with the refrigerant circuit, that is, one medium pipeline is communicated with the refrigerant. The indoor side heat exchanger 202, the water pump 203 and the other medium pipeline of the first heat exchanger 103 are communicated with each other to form an indoor circulating water circuit, that is, the other medium pipeline of the first heat exchanger 103 is communicated with water. In the embodiment, the first heat exchanger 103 and the second heat exchanger 106 are arranged outdoors, and the indoor side heat exchanger 202 is arranged indoors, so that the heat exchange medium circulating in the room is water instead of refrigerant.

[0074] In an embodiment of the present application, the indoor side circulation system can also include a buffer water tank 201, which is communicated between the inlet of the water pump 203 and the first heat exchanger 103. The buffer water tank 201 can adopt the water pipe connection mode of upper water inlet and lower water outlet, so that the gas volume in the water exists in the upper space of the buffer water tank 201, and is discharged through the exhaust valve, ensuring the purity of the water in the system and reducing the occurrence of faults.

[0075] If the circulating water volume in the indoor side circulation system is limited, the water temperature will change greatly, which will cause the compressor 101 to start frequently, shorten the service life and increase the energy consumption. The buffer water tank 201 increases the water capacity of the system, so that the temperature change is more stable, thereby reducing the number of compressor 101 start, prolonging the service life and saving energy.

[0076] As shown in the present application and claims, unless the context clearly indicates otherwise, the words "comprise", "comprising", "include", "including" and the like are to be construed in an inclusive sense, as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to". Similarly, the words "comprises", "comprising", "includes", "including" and the like can mean "including, but not limited to".

[0077] In the description of the present application, the words "arrange", "install", "connect" and the like should be understood in a broad sense, and the specific meanings of the above words in the present application can be reasonably determined by those skilled in the art in combination with the specific content of the technical solutions.

[0078] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be mutually referred to.

[0079] The principles and implementation modes of the present application are described by applying specific examples in the present application. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An air conditioning system, characterized by, The system circuit body comprises a refrigerant circuit composed of a compressor (101), a four-way valve (102), a first heat exchanger (103), a second heat exchanger (106) and a throttling device (105); An ejector (104) is arranged upstream of the throttling device (105), and a spray port of the ejector (104) is communicated with an inlet of the throttling device (105), and a suction port of the ejector (104) is communicated with a suction side of the compressor (101); A switching valve group is arranged upstream of the throttling device (105), and is used for switching one of the first heat exchanger (103) and the second heat exchanger (106) to be communicated with the inlet of the ejector (104) and the other to be communicated downstream of the throttling device (105) according to a mode of the air conditioning system. The switching valve group comprises:

2. The air conditioning system of claim 1, wherein, A first valve group branch circuit comprises a first pipeline and first and second check valves (401) and (402) connected in series on the first pipeline, and the first and second check valves (401) and (402) are in a conductive state along a direction from a first end to a second end of the first pipeline; A second valve group branch circuit comprises a second pipeline and third and fourth check valves (403) and (404) connected in series on the second pipeline, and the third and fourth check valves (403) and (404) are in a conductive state along a direction from a first end to a second end of the second pipeline, an outlet of the throttling device (105) is communicated with the first end of the first pipeline and the first end of the second pipeline through a pipeline, an inlet of the ejector (104) is communicated with the second end of the first pipeline and the second end of the second pipeline through a pipeline, one refrigerant port of the first heat exchanger (103) is communicated with the four-way valve (102), and the other refrigerant port is communicated with the first pipeline and located between the first and second check valves (401) and (402), one refrigerant port of the second heat exchanger (106) is communicated with the four-way valve (102), and the other refrigerant port is communicated with the second pipeline and located between the third and fourth check valves (403) and (404). A first valve port of the four-way valve (102) is communicated with a discharge port of the compressor (101), a second valve port is communicated with the first refrigerant port of the first heat exchanger (103), a third valve port is communicated with the first refrigerant port of the second heat exchanger (106), and a fourth valve port is communicated with a suction port of the compressor (101); 3. The air conditioning system of claim 1, wherein, When the air conditioning system is in a heating mode, the first valve port and the second valve port of the four-way valve (102) are communicated, and the third valve port and the fourth valve port are communicated; When the air conditioning system is in a cooling mode, the first valve port and the third valve port of the four-way valve (102) are communicated, and the second valve port and the fourth valve port are communicated. A proportional three-way regulating valve (301) is further arranged and communicated between the fourth valve port of the four-way valve (102) and the suction port of the compressor (101).

4. The air conditioning system of claim 3, wherein, ​ The first valve port of the proportional three-way regulating valve (301) is communicated with the fourth valve port of the four-way valve (102), the second valve port of the proportional three-way regulating valve (301) is communicated with the suction port of the compressor (101), and the third valve port of the proportional three-way regulating valve (301) is communicated with the suction inlet of the ejector (104).

5. The air conditioning system of claim 4, wherein, The proportional opening degree of the first valve port of the proportional three-way regulating valve (301) to the second valve port and the third valve port of the proportional three-way regulating valve (301) is adjustable.

6. The air conditioning system of claim 5, wherein, Further comprising: A first pressure sensor (302) for detecting the discharge side pressure of the compressor (101); A second pressure sensor (303) for detecting the suction side pressure of the compressor (101), and when the discharge side pressure and the suction side pressure are in a safe operation range, the opening degree of the third valve port of the proportional three-way regulating valve (301) is increased.

7. The air conditioning system of claim 4, wherein, Further comprising a temperature pressure sensor (304) for detecting the supercooling degree of the refrigerant.

8. The air conditioning system according to any one of claims 1 to 7, wherein The throttling member (105) is an electronic expansion valve or a capillary tube.

9. The air conditioning system according to any one of claims 1 to 7, wherein The air conditioning system is a fluorine non-in-home air conditioning system, and the air conditioning system further comprises an indoor side circulating system, the indoor side circulating system comprising an indoor side heat exchanger (202) and a water pump (203); The first heat exchanger (103) is a double medium heat exchanger, one medium pipeline of the first heat exchanger (103) is communicated with the refrigerant circuit, and the indoor side heat exchanger (202), the water pump (203) and another medium pipeline of the first heat exchanger (103) are communicated with each other to form an indoor circulating water circuit.

10. The air conditioning system of claim 9, wherein, The indoor side circulating system further comprises a buffer water tank (201), and the buffer water tank (201) is communicated between the inlet of the water pump (203) and the first heat exchanger (103).

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