Air conditioning system

Abstract

The invention discloses an air conditioning system. The air conditioning system comprises an outdoor unit, an indoor unit and energy storage equipment. The energy storage equipment is connected between the outdoor unit and the indoor unit and comprises an energy storage heat exchanger. The energy storage heat exchanger is provided with a first port and a second port which are located at the two ends correspondingly, and comprises an energy storage medium storage cavity used for storing energy storage media and a refrigerant heat exchange pipe arranged in the energy storage medium storage cavity. The refrigerant heat exchange tube comprises at least two heat exchange tube sets which are oppositely arranged in parallel, the first ends of the at least two heat exchange tube sets are connected with the first port, and the second ends of the at least two heat exchange tube sets are connected with the second port. According to the energy storage heat exchanger of the energy storage equipment of the air conditioning system, the energy storage uniformity is improved, and then the energy storage efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an air conditioner. Background Technology

[0002] To alleviate the discomfort caused by hot weather, people usually use air conditioning systems to lower indoor temperatures and improve indoor comfort. Currently, some air conditioning systems are equipped with energy storage devices, but the energy storage efficiency of these devices is not high.

[0003] It should be noted that the statements in this background section only provide background information relevant to this application and do not necessarily constitute prior art. Summary of the Invention

[0004] This application provides an air conditioning system to improve energy storage efficiency.

[0005] This application provides an air conditioning system, including:

[0006] Outdoor unit;

[0007] Indoor unit; and

[0008] An energy storage device is connected between an outdoor unit and an indoor unit, and the energy storage device includes an energy storage heat exchanger. The energy storage heat exchanger has a first port and a second port located at both ends, and includes an energy storage medium storage chamber for storing an energy storage medium and a refrigerant heat exchange tube disposed in the energy storage medium storage chamber. The refrigerant heat exchange tube includes at least two heat exchange tube groups arranged opposite to each other and in parallel. The first ends of the at least two heat exchange tube groups are all connected to the first port, and the second ends of the at least two heat exchange tube groups are all connected to the second port.

[0009] In some embodiments, the heat exchange tube assembly includes a plurality of heat exchange branches arranged in parallel and spaced apart, each heat exchange branch being connected to a first port and a second port respectively.

[0010] In some embodiments, a plurality of heat exchange branch pipes are parallel to each other, each heat exchange branch pipe having a first interface connected to a first port and a second interface connected to a second port, one of the first interface and the other of the second interface being an inlet and the other being an outlet, the outlets of the plurality of heat exchange branch pipes being located at the same end, wherein the inlets of the plurality of heat exchange branch pipes are all located at opposite ends of the outlets; or, in two adjacent heat exchange branch pipes among the plurality of heat exchange branch pipes, the inlet of one heat exchange branch pipe is located at the same end of the outlet, and the inlet of the other heat exchange branch pipe is located at the opposite end of the outlet.

[0011] In some embodiments, the energy storage heat exchanger further includes a plurality of intermediate connecting pipes disposed between the first port and the heat exchange tube group, wherein the plurality of intermediate connecting pipes are disposed in a one-to-one correspondence with a plurality of heat exchange branch pipes, and the intermediate connecting pipes are flexible pipes, wherein the intermediate connecting pipes are distributed on one side of the plurality of heat exchange branch pipes; or a portion of the intermediate connecting pipes is distributed on the opposite side of the plurality of heat exchange branch pipes.

[0012] In some embodiments, the outdoor unit includes an outdoor unit liquid pipe and an outdoor unit gas pipe, the indoor unit includes an indoor unit liquid pipe and an indoor unit gas pipe, and the energy storage device further includes a first liquid pipe connected to the outdoor unit liquid pipe, a first gas pipe connected to the outdoor unit gas pipe, a second liquid pipe connected to the indoor unit liquid pipe, a second gas pipe connected to the indoor unit gas pipe, and a control valve assembly. The first gas pipe and the second gas pipe are connected in communication. The control valve assembly is activated to switch the air conditioning system between different operating modes. The control valve assembly includes a first control valve and a second control valve. The first end of the first control valve is connected to the first liquid pipe, the second end of the first control valve is connected to a second port, the first end of the second control valve is connected to the first port, and the second end of the second control valve is connected to the second liquid pipe.

[0013] The operating modes include a subcooling release mode. In the subcooling release mode, the first control valve and the second control valve are configured to open so that the energy storage heat exchanger becomes a subcooler. The refrigerant output from the outdoor unit's liquid pipe enters the energy storage device through the first liquid pipe, enters the second port of the energy storage heat exchanger through the first control valve, flows out through the first port of the energy storage heat exchanger, and then flows to the second liquid pipe through the second control valve.

[0014] In some embodiments, the energy storage device further includes a bypass branch, a first end of which is connected to a first liquid pipe and a second end of which is connected to a second liquid pipe. The bypass branch is configured to be on and off. In the subcooling release mode, the bypass branch is configured to be connected so that a portion of the refrigerant entering the energy storage device through the first liquid pipe flows directly through the bypass branch to the second liquid pipe.

[0015] In some embodiments, the first end of the bypass branch is directly connected to the first liquid pipe; or, the first end of the bypass branch is directly connected to the second port.

[0016] In some embodiments, a third control valve for controlling the on / off state is provided on the bypass branch.

[0017] In some embodiments, the control valve assembly further includes a fourth control valve disposed between the first liquid line and the second liquid line, and the opening degree of the fourth control valve is adjustable. The operating mode also includes a normal refrigeration mode, in which the fourth control valve is configured to be fully open and the first and second control valves are configured to be closed; in a subcooling release mode, the fourth control valve is configured to be closed or open at a set opening degree less than the full opening degree.

[0018] In some embodiments, the control valve assembly further includes an expansion valve and a fifth control valve. The expansion valve is disposed between the first liquid pipe and the first port, and the fifth control valve is disposed between the second port and the first gas pipe. The operating mode also includes a cold storage mode. In the cold storage mode, the first and second control valves are configured to be closed, and the expansion valve and the fifth control valve are opened so that the refrigerant output from the outdoor unit's liquid pipe enters the energy storage device through the first liquid pipe, enters the first port of the energy storage heat exchanger through the expansion valve, flows out through the second port of the energy storage heat exchanger, and then flows to the first gas pipe through the fifth control valve.

[0019] In some embodiments, the control valve assembly further includes a fourth control valve disposed between the first liquid line and the second liquid line to control the opening and closing of the flow path. The operating mode also includes a cold storage and cooling mode, in which the fourth control valve, the expansion valve and the fifth control valve are configured to be open, and the first control valve and the second control valve are configured to be closed.

[0020] In some embodiments, the operating mode also includes at least one of a conventional heating mode, a heat storage mode, and a defrosting heat release mode.

[0021] In some embodiments, the energy storage device further includes a low-pressure refrigerant pipe, the outdoor unit further includes a low-pressure pipe, the low-pressure refrigerant pipe is connected to the low-pressure pipe, and the energy storage device further includes a refrigerant adjustment tank, a first refrigerant adjustment control valve, and a second refrigerant adjustment control valve disposed between the first end of the first control valve and the low-pressure refrigerant pipe.

[0022] Based on the technical solution provided in this application, an air conditioning system includes an outdoor unit, an indoor unit, and an energy storage device. The energy storage device is connected between the outdoor unit and the indoor unit and includes an energy storage heat exchanger. The energy storage heat exchanger has a first port and a second port located at both ends and includes an energy storage medium storage chamber for storing the energy storage medium and refrigerant heat exchange tubes disposed within the energy storage medium storage chamber. The refrigerant heat exchange tubes include at least two heat exchange tube groups arranged opposite each other and in parallel. The first ends of at least two heat exchange tube groups are connected to the first port, and the second ends of at least two heat exchange tube groups are connected to the second port. By arranging at least two opposite heat exchange tube groups in the energy storage heat exchanger of the air conditioning system in this application embodiment, the refrigerant is diverted after entering the energy storage heat exchanger, allowing the energy storage medium in different areas to exchange heat with the refrigerant. This avoids problems such as insufficient or excessive energy storage in some areas, improves energy storage uniformity, and thus improves energy storage efficiency. Furthermore, the energy storage heat exchanger in this embodiment avoids the problem of uneven heat exchange caused by excessively long flow paths and excessive pressure loss in single-pass pipelines, compared to setting at least two opposing heat exchange tube groups.

[0023] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the piping structure of an air conditioning system according to some embodiments of this application.

[0026] Figure 2 for Figure 1 A schematic diagram of the air conditioning system in the embodiment shown.

[0027] Figure 3 for Figure 1 A schematic diagram of the first structural form of the energy storage device of the air conditioning system shown in the embodiment.

[0028] Figure 4 for Figure 1 A schematic diagram of the second structural form of the energy storage device of the air conditioning system in the embodiment shown.

[0029] Figure 5 for Figure 1 A schematic diagram of the third structural form of the energy storage device of the air conditioning system shown in the embodiment.

[0030] Figure 6 for Figure 1 A schematic diagram of the fourth structural form of the energy storage device of the air conditioning system shown in the embodiment.

[0031] Figure 7 for Figure 1 The diagram shows the structure of the air conditioning system in conventional cooling mode in the embodiment shown.

[0032] Figure 8 for Figure 1 The diagram shows the structure of the air conditioning system in cold storage mode according to the embodiment shown.

[0033] Figure 9 for Figure 1 The diagram shows the structure of the air conditioning system in subcooling release mode in the embodiment shown.

[0034] Figure 10 for Figure 1 The diagram shows the structure of the air conditioning system in the embodiment of the present invention, which is in the mode of both cold storage and cooling.

[0035] Figure 11 for Figure 1 The diagram shows the structure of the air conditioning system in conventional heating mode according to the embodiment shown.

[0036] Figure 12 for Figure 1 The diagram shows the structure of the air conditioning system in heat storage mode according to the embodiment shown.

[0037] Figure 13 for Figure 1 The diagram shows the structure of the air conditioning system in defrosting and heating mode according to the embodiment shown.

[0038] Figure 14 This is a schematic diagram of the structure of an air conditioning system according to other embodiments of this application.

[0039] Figure 15 This is a schematic diagram of the structure of an air conditioning system according to some embodiments of this application.

[0040] Figure 16 This is a schematic diagram of the structure of an air conditioning system according to some other embodiments of this application.

[0041] Figure 17 This is a schematic diagram of the piping structure of an air conditioning system according to other embodiments of this application.

[0042] Figure 18 for Figure 17 A schematic diagram of the air conditioning system in the embodiment shown.

[0043] 1. Outdoor unit; 101. Outdoor unit liquid pipe; 102. Outdoor unit gas pipe; 103. Low-pressure pipe;

[0044] 2. Indoor unit; 201. Indoor unit liquid pipe; 202. Indoor unit gas pipe;

[0045] 3. Energy storage equipment; 301. First liquid pipe; 302. First gas pipe; 303. Second liquid pipe; 304. Second gas pipe; 306. Expansion valve; 307. First control valve; 308. Second control valve; 313. Third control valve; 305. Fourth control valve; 309. Fifth control valve; 310. Energy storage heat exchanger; 3101. First port; 3102. Second port; 3103. Energy storage medium storage chamber; 3104. Heat exchange branch pipe; 3107. First collector; 3105. Second collector; 3106. Intermediate connecting pipe; 3109. Heat exchange tube assembly; 311. Refrigerant adjustment tank; 3111. Refrigerant adjustment inlet pipe; 3112. Refrigerant adjustment outlet pipe; 3113. First refrigerant adjustment control valve; 3114. Second refrigerant adjustment control valve; 312. Low-pressure refrigerant pipe. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] refer to Figure 1 and Figure 2The air conditioning system of some embodiments of this application includes an outdoor unit 1, an indoor unit 2, and an energy storage device 3. The energy storage device 3 is connected between the outdoor unit 1 and the indoor unit 2, and includes an energy storage heat exchanger 310. The energy storage heat exchanger 310 has a first port 3101 and a second port 3102 located at both ends, and includes an energy storage medium storage cavity 3103 for storing an energy storage medium and refrigerant heat exchange tubes disposed in the energy storage medium storage cavity 3103. The refrigerant heat exchange tubes include at least two heat exchange tube groups arranged opposite to each other and in parallel. The first ends of the at least two heat exchange tube groups are connected to the first port 3101, and the second ends of the at least two heat exchange tube groups are connected to the second port 3102.

[0050] Outdoor unit 1 is installed outdoors for heat exchange with the external environment. Indoor unit 2 is used for heat exchange with the indoor environment to control the indoor temperature. Energy storage device 3 is used to store heat or cold and release the stored energy when needed to assist in temperature regulation.

[0051] Indoor unit 2 includes an indoor heat exchanger. In some embodiments, indoor unit 2 includes at least two indoor heat exchangers arranged in parallel.

[0052] Outdoor unit 1 includes a compressor, a four-way valve, and an outdoor heat exchanger. By controlling the operation of the four-way valve, the outdoor and indoor heat exchangers switch between evaporation and condensation states, thereby regulating the indoor temperature. When the indoor heat exchanger is in evaporation mode and the outdoor heat exchanger is in condensation mode, cooling is provided to the indoor unit; when the indoor heat exchanger is in condensation mode and the outdoor heat exchanger is in evaporation mode, heating is provided to the indoor unit. Switching the four-way valve of outdoor unit 1 to switch between cooling and heating is a conventional technique in the art and will not be described or explained in detail here. Of course, in some embodiments, outdoor unit 1 also includes a throttling device.

[0053] The energy storage device 3 of this application embodiment includes an energy storage heat exchanger 310. The energy storage heat exchanger 310 has a first port 3101 and a second port 3102 located at both ends. One of the first port 3101 and the second port 3102 is the inlet port of the refrigerant, and the other is the outlet port of the refrigerant. That is, the refrigerant can flow from the first port 3101 to the second port 3102 or from the second port 3102 back to the first port 3101 in the energy storage heat exchanger 310. The flow direction of the refrigerant inside the energy storage heat exchanger 310 is different depending on the different operating modes. In the following description of the structure of the energy storage heat exchanger 310, the first port 3101 is used as an example as the inlet port.

[0054] refer to Figure 3The energy storage heat exchanger 310 of this application embodiment includes an energy storage medium storage cavity 3103 and a refrigerant heat exchange tube disposed within the energy storage medium storage cavity 3103. The energy storage medium storage cavity 3103 is filled with an energy storage medium and is provided with a refrigerant heat exchange tube. The refrigerant flows in the refrigerant heat exchange tube and exchanges heat fully with the energy storage medium to achieve cold storage and release.

[0055] The refrigerant heat exchange tubes in this embodiment include at least two heat exchange tube groups arranged opposite to each other and in parallel in the second direction Y. This allows the refrigerant to enter the at least two oppositely arranged heat exchange tube groups after entering the energy storage heat exchanger 310, resulting in a split flow of the refrigerant within the energy storage heat exchanger 310. Consequently, the energy storage medium in different regions of the energy storage heat exchanger 310 can respectively achieve heat exchange with the two heat exchange tube groups.

[0056] In some embodiments, the number of at least two heat exchanger tube groups is even so that the heat exchanger tube groups are arranged opposite each other in pairs.

[0057] The energy storage heat exchanger 310 of the air conditioning system in this embodiment of the application is equipped with at least two opposing heat exchange tube groups. This allows the refrigerant to be distributed after entering the energy storage heat exchanger 310, enabling heat exchange between the energy storage medium in different areas and the refrigerant. This avoids problems such as insufficient or excessive energy storage in some areas, improves energy storage uniformity, and thus improves energy storage efficiency. Moreover, by equipping the energy storage heat exchanger 310 with at least two opposing heat exchange tube groups, compared with a single-pass pipeline, the problem of uneven heat exchange caused by excessively long flow paths and excessive pressure losses in a single-pass pipeline is avoided.

[0058] refer to Figures 3 to 6 To further improve the uniformity of heat exchange in the energy storage medium, in some embodiments, the heat exchange tube assembly includes multiple heat exchange branch pipes 3104 arranged in parallel and at intervals. That is, the refrigerant entering each heat exchange tube assembly undergoes secondary diversion through multiple heat exchange branch pipes 3104. This allows the energy storage medium at different locations to exchange heat with the entering refrigerant approximately simultaneously. Since the multiple heat exchange branch pipes 3104 are connected in parallel, the temperature of the refrigerant entering the heat exchange branch pipes 3104 is essentially the same, ensuring that the energy storage medium at different locations can exchange heat with refrigerant at the same temperature, further improving the uniformity of energy storage.

[0059] In some embodiments, the refrigerant within the multiple heat exchange branch pipes 3104 flows in the same direction. Specifically, as... Figure 3As shown, multiple heat exchange branch pipes 3104 are parallel to each other. Each heat exchange branch pipe 3104 has a first interface connected to a first port 3101 and a second interface connected to a second port 3102. One of the first interface and the second interface is an inlet, and the other is an outlet. The outlets of multiple heat exchange branch pipes 3104 are all located at the same end, and the inlets of multiple heat exchange branch pipes 3104 are all located at the opposite ends of the outlets. Figure 3 As shown, the inlet of each heat exchange branch pipe 3104 is located at the upper end, and the outlet is located at the lower end. The inlet of each heat exchange branch pipe 3104 is located at the upper end and is connected to the first port 3101, specifically through the first collector 3107. The outlet of each heat exchange branch pipe 3104 is located at the lower end and is connected to the second port 3102, specifically through the second collector 3105. This arrangement ensures that the inlet and outlet positions of the heat exchange branch pipes 3104 are consistent, thereby simplifying manufacturing and piping layout.

[0060] In some embodiments, each heat exchange branch 3104 extends along the second direction Y.

[0061] In other embodiments, among a plurality of heat exchange branch pipes 3104, the inlet of one heat exchange branch pipe 3104 is located at the same end of the outlet, and the inlet of the other heat exchange branch pipe 3104 is located at the opposite end of the outlet. (See reference) Figure 5 ,exist Figure 5 The diagram shows two adjacent heat exchange branches, namely the first heat exchange branch 3104a and the second heat exchange branch 3104b. The inlet of the first heat exchange branch 3104a is located at the upper end, and the inlet of the second heat exchange branch 3104b is located at the lower end. This makes the distribution of refrigerant in the two adjacent heat exchange branches more uniform in the second direction Y, further improving the heat exchange uniformity and energy storage efficiency.

[0062] refer to Figure 5 In some embodiments, the energy storage heat exchanger 310 further includes a plurality of intermediate connecting pipes 3106 disposed between the first port 3101 and the heat exchange tube group. The plurality of intermediate connecting pipes 3106 are disposed in a one-to-one correspondence with a plurality of heat exchange branch pipes 3104, and the intermediate connecting pipes 3106 are flexible pipes. The flexible pipes are distributed on one side of the plurality of heat exchange branch pipes 3104.

[0063] The first port 3101 is connected to at least two heat exchange tube groups via at least two first collectors 3107. Each first collector 3107 is connected to multiple heat exchange branch pipes 3104 via multiple intermediate connecting pipes 3106. Figure 5In the illustrated embodiment, the first end of the intermediate connecting pipe 3106 is connected to the first collector 3107, and the second end of the intermediate connecting pipe 3106 is connected to the heat exchange branch pipe 3104. The entire pipe section of the intermediate connecting pipe 3106 is distributed on the upper side, that is, it is distributed on the same side as the multiple heat exchange branch pipes 3104 connected to it. This allows the intermediate connecting pipes 3106 corresponding to the heat exchange tube groups on the upper and lower sides to be set in different areas, which is beneficial for the layout of the pipeline and subsequent maintenance.

[0064] refer to Figure 4 and Figure 6 In other embodiments, portions of the intermediate connecting pipe 3106 are distributed on opposite sides of the plurality of heat exchange branch pipes 3104. For example... Figure 4 As shown, the inlets of each heat exchange branch pipe 3104 in the upper heat exchange tube group are located at the lower end, and the outlets are located at the upper end; the inlets of each heat exchange branch pipe 3104 in the lower heat exchange tube group are located at the upper end, and the outlets are located at the lower end. That is to say, Figure 4 In the illustrated embodiment, the inlets of the heat exchanger tube assemblies are all located at one end near the center of the energy storage medium chamber. Furthermore, in Figure 4 In the illustrated embodiment, portions of the intermediate connecting pipes 3106 corresponding to the heat exchanger tube assemblies on both sides extend to the opposite side. Specifically, portions of the intermediate connecting pipes 3106 corresponding to the upper heat exchanger tube assembly extend to the lower side, and portions of the intermediate connecting pipes 3106 corresponding to the lower heat exchanger tube assembly extend to the upper side. This allows the intermediate connecting pipes 3106 to be positioned closer to the center, avoiding excessive space occupation and improving the compactness of the pipework arrangement. Similarly, in Figure 6 In the illustrated embodiment, the intermediate connecting pipe 3106 is also positioned closer to the center to avoid occupying more space.

[0065] refer to Figure 9 In some embodiments, the outdoor unit 1 includes an outdoor unit liquid pipe 101 and an outdoor unit gas pipe 102. The indoor unit 2 includes an indoor unit liquid pipe 201 and an indoor unit gas pipe 202. The energy storage device 3 further includes a first liquid pipe 301 connected to the outdoor unit liquid pipe 101, a first gas pipe 302 connected to the outdoor unit gas pipe 102, a second liquid pipe 303 connected to the indoor unit liquid pipe 201, a second gas pipe 304 connected to the indoor unit gas pipe 202, and a control valve assembly. The first gas pipe 302 and the second gas pipe 304 are connected. The control valve assembly is activated to switch the air conditioning system between different operating modes. The control valve assembly includes a first control valve 307 and a second control valve 308. The first end of the first control valve 307 is connected to the first liquid pipe 301, and the second end of the first control valve 307 is connected to a second port 3102. The first end of the second control valve 308 is connected to the first port 3101, and the second end of the second control valve 308 is connected to the second liquid pipe 303.

[0066] The operating modes include a subcooling release mode. In the subcooling release mode, the first control valve 307 and the second control valve 308 are configured to open so that the energy storage heat exchanger 310 acts as a subcooler. The refrigerant output from the outdoor unit liquid pipe 101 enters the energy storage device 3 through the first liquid pipe 301, enters the second port 3102 of the energy storage heat exchanger 310 through the first control valve 307, flows out through the first port 3101 of the energy storage heat exchanger 310, and then flows to the second liquid pipe 303 through the second control valve 308.

[0067] In the subcooling and heat release mode, the energy storage heat exchanger 310 is used as a subcooler. The liquid refrigerant supplied from the outdoor unit first flows through the energy storage heat exchanger 310 to be further cooled by the energy storage medium, thereby obtaining a greater degree of subcooling. Then, when it enters the indoor heat exchanger of the indoor unit to evaporate and absorb heat, it can take away more heat, thereby improving the cooling capacity of the air conditioning system.

[0068] In some embodiments, the energy storage device 3 further includes a bypass branch. A first end of the bypass branch is connected to a first liquid pipe 301, and a second end of the bypass branch is connected to a second liquid pipe 303. The bypass branch is configured to be on and off. In subcooling release mode, the bypass branch is configured to be open so that a portion of the refrigerant entering the energy storage device 3 through the first liquid pipe 301 flows directly through the bypass branch to the second liquid pipe 303.

[0069] The first end of the bypass branch is connected to the first liquid pipe 301, and the second end is connected to the second liquid pipe 303. When the bypass branch is connected, the refrigerant in the first liquid pipe 301 can flow directly through the bypass branch to the second liquid pipe 303 and then into the indoor heat exchanger for evaporation.

[0070] This embodiment of the application sets up a bypass branch and controls its connection in the subcooling release mode. This allows a portion of the refrigerant to flow directly to the second liquid pipe 303 through the bypass branch. In other words, this portion of the refrigerant flows directly to the indoor unit without undergoing subcooling, thus avoiding excessive consumption of cooling capacity in the energy storage heat exchanger due to full-flow subcooling. This, in turn, facilitates the continuous and stable provision of auxiliary subcooling capacity by the energy storage heat exchanger. To prevent all refrigerant from passing through the bypass branch, in some embodiments, a throttling device is installed on the bypass branch to increase its flow resistance. Alternatively, an adjustable flow device can be provided to control the flow rate of refrigerant through the bypass branch for fine-tuning.

[0071] Of course, in some other embodiments, the bypass branch can also be disconnected so that all the refrigerant is subcooled through the energy storage heat exchanger, and the opening and closing of the bypass branch is controlled according to the demand for the amount of cold released.

[0072] In some embodiments, reference Figure 14The first end of the bypass branch is directly connected to the second port 3102. The second port 3102 is connected to the first liquid pipe 301 through the first control valve 307. Therefore, in the subcooling release mode, the first control valve 307 is opened so that the refrigerant transported by the first liquid pipe 301 can flow through the first control valve 307 to the second port 3102 in sequence. At the second port 3102, the refrigerant is split. Part of it enters the energy storage heat exchanger 310 for subcooling, and the other part flows directly to the second liquid pipe 303 through the bypass branch.

[0073] refer to Figure 15 The first end of the bypass branch is directly connected to the first liquid pipe 301. In this way, part of the refrigerant transported by the first liquid pipe 301 flows directly to the second liquid pipe 303 through the bypass branch, and the other part flows to the second port 3102 through the first control valve 307 and enters the energy storage heat exchanger 310 for subcooling.

[0074] refer to Figure 14 and Figure 15 In some embodiments, a third control valve 313 for controlling on / off states is provided on the bypass branch. Alternatively, the third control valve 313 may be an on / off control valve that can only control on / off states, or it may be a control valve with an adjustable opening degree.

[0075] refer to Figure 16 In some embodiments, the control valve assembly further includes a fourth control valve 305. The fourth control valve 305 is disposed between the first liquid line 301 and the second liquid line 303, and its opening degree is adjustable. The operating mode also includes a normal cooling mode, in which the fourth control valve 305 is configured to be fully open. The first control valve 307 and the second control valve 308 are configured to be closed. In a subcooling release mode, the fourth control valve 305 is configured to be closed or open at a set opening degree less than the full opening degree.

[0076] In normal cooling mode, the first control valve 307 and the second control valve 308 are closed, and the fourth control valve 305 is fully open. This allows the refrigerant supplied from the first liquid line 301 to flow directly to the second liquid line 303 through the fully open fourth control valve 305, bypassing the energy storage heat exchanger and thus entering normal cooling mode. In subcooling release mode, the fourth control valve 305 is opened to a set degree. This allows a portion of the refrigerant supplied from the first liquid line 301 to flow directly to the second liquid line 303 through the fourth control valve 305, while the other portion flows through the first control valve 307 to the second port 3102 and enters the energy storage heat exchanger 310 for subcooling before flowing back to the second liquid line 303 through the pipe containing the second control valve 308. Alternatively, depending on the required amount of refrigerant released, in subcooling release mode, the fourth control valve 305 can be closed, allowing all the refrigerant to undergo subcooling through the energy storage heat exchanger. In other words, the operation of the fourth control valve 305 is controlled according to the required amount of refrigerant released.

[0077] In this embodiment, an adjustable fourth control valve 305 is provided between the first liquid pipe 301 and the second liquid pipe 303. By controlling the opening of the fourth control valve 305, the air conditioning system can switch between the normal cooling mode and the subcooling release mode without adding new pipes and new control valves.

[0078] In some embodiments, the control valve assembly further includes an expansion valve 306 and a fifth control valve 309. The expansion valve 306 is disposed between the first liquid pipe 301 and the first port 3101, and the fifth control valve 309 is disposed between the second port 3102 and the first gas pipe 302. The operating mode also includes a cold storage mode. In the cold storage mode, the first control valve 307 and the second control valve 308 are configured to be closed, and the expansion valve 306 and the fifth control valve 309 are opened so that the refrigerant output from the outdoor unit liquid pipe 101 enters the energy storage device 3 through the first liquid pipe 301, enters the first port 3101 of the energy storage heat exchanger 310 through the expansion valve 306, flows out through the second port 3102 of the energy storage heat exchanger 310, and then flows to the first gas pipe 302 through the fifth control valve 309.

[0079] In some embodiments, the control valve assembly further includes a fourth control valve 305. The fourth control valve 305 is disposed between the first liquid line 301 and the second liquid line 303 to control the opening and closing of the flow path. The operating mode also includes a cold storage and cooling mode. In the cold storage and cooling mode, the fourth control valve 305, the expansion valve 306, and the fifth control valve 309 are configured to be open, and the first control valve 307 and the second control valve 308 are configured to be closed.

[0080] In some embodiments, the operating mode also includes at least one of a conventional heating mode, a heat storage mode, and a defrosting heat release mode.

[0081] In some embodiments, the energy storage device 3 further includes a low-pressure refrigerant pipe 312, and the outdoor unit 1 further includes a low-pressure pipe 103, with the low-pressure refrigerant pipe 312 connected to the low-pressure pipe 103. The energy storage device 3 also includes a refrigerant adjustment tank 311, a first refrigerant adjustment control valve 3113, and a second refrigerant adjustment control valve 3114 disposed between the first end of the first control valve 307 and the low-pressure refrigerant pipe 312.

[0082] The energy storage device 3 in this embodiment of the application adds a low-pressure refrigerant pipe 312 and a refrigerant adjustment tank 311 to adjust the amount of circulating refrigerant in different modes of the air conditioning system, so that the amount of circulating refrigerant can adapt to the heat exchange capacity of the cold storage system and improve the cooling performance of the air conditioning system.

[0083] When the system has too much refrigerant, it needs to store refrigerant in the refrigerant adjustment tank 311. At this time, the first refrigerant adjustment control valve 3113 is opened and the second refrigerant adjustment control valve 3114 is closed, and the refrigerant enters the refrigerant adjustment tank. When the system has too little refrigerant, it needs to discharge the refrigerant in the refrigerant adjustment tank into the pipeline. At this time, the second refrigerant adjustment control valve 3114 is opened and the first refrigerant adjustment control valve 3113 is closed.

[0084] The following is based on Figure 1 To the Figure 18 The structure and operation of the air conditioning system according to some specific embodiments of this application are described in detail.

[0085] like Figure 1 As shown, the air conditioning system of this embodiment includes an outdoor unit 1, an indoor unit 2, and an energy storage device 3. The outdoor unit 1 includes an outdoor unit liquid pipe 101 and an outdoor unit gas pipe 102. The indoor unit 2 includes an indoor unit liquid pipe 201 and an indoor unit gas pipe 202. The energy storage device 3 includes a first liquid pipe 301, a first gas pipe 302, a second liquid pipe 303, and a second gas pipe 304.

[0086] The first gas pipe 302 of the energy storage device 3 is connected to the outdoor unit gas pipe 102 of the outdoor unit 1; the first liquid pipe 301 of the energy storage device 3 is connected to the outdoor unit liquid pipe 101 of the outdoor unit 1. The second gas pipe 304 of the energy storage device 3 is connected to the indoor unit gas pipe 202 of the indoor unit 2. The second liquid pipe 303 of the energy storage device 3 is connected to the indoor unit liquid pipe 201 of the indoor unit 2.

[0087] like Figure 2 As shown, the energy storage device 3 includes an energy storage heat exchanger 310 and a control valve assembly. The control valve assembly includes a first control valve 307, a second control valve 308, a fourth control valve 305, a fifth control valve 309, and an expansion valve 306.

[0088] One end of the first control valve 307, the fourth control valve 305, and the expansion valve 306 is connected to the first liquid pipe 301 of the accumulator; the other end of the expansion valve 306 and one end of the second control valve 308 are connected to the first port 3101; the other end of the second control valve 308 and the other end of the fourth control valve 305 are connected to the second liquid pipe 303 of the accumulator; one end of the fifth control valve 309 is connected to the second port 3102 and the other end of the first control valve 307; the other end of the fifth control valve 309 is divided into two paths, one connected to the first gas pipe 302 of the accumulator and the other connected to the second gas pipe 304 of the accumulator. The expansion valve 306 has the functions of flow regulation and throttling pressure reduction.

[0089] As shown in the table below, the actions of each valve in the control valve assembly are controlled. Figure 2 The air conditioning system shown can switch between seven modes, including normal cooling mode, cold storage mode, subcooling and cold release mode, cold storage and cooling mode, normal heating mode, heat storage mode, and defrosting heating mode.

[0090] Figure 7 The table above illustrates the refrigerant delivery path in conventional cooling mode. In conventional cooling mode, as shown in the table, all other control valves are closed, except for the fourth control valve 305, which is open. The refrigerant output from the outdoor unit liquid line 101 of outdoor unit 1 flows into the energy storage device 3 through the first liquid line 301, and then directly flows to the second liquid line 303 through the fourth control valve 305, continuing into the indoor unit liquid line 201 of indoor unit 2. After heat exchange in indoor unit 2, the refrigerant flows out through the indoor unit gas line 202 and directly back to the first gas line 302 through the second gas line 304. Therefore, in conventional cooling mode, the refrigerant flow path does not pass through the energy storage heat exchanger.

[0091] Figure 8 The refrigerant delivery path in cold storage mode is shown. In cold storage mode, as shown in the table above, expansion valve 306 and fifth control valve 309 are open. The refrigerant entering the energy storage device 3 flows through expansion valve 306 into the energy storage heat exchanger 310, and then flows back to the outdoor unit 1 through the flow path of fifth control valve 309. It can be seen that in cold storage mode, the refrigerant does not pass through the indoor unit, but only through the energy storage heat exchanger for cold storage. In cold storage mode, the refrigerant flows from the first port 3101 to the second port 3102 within the energy storage heat exchanger 310.

[0092] Figure 9The diagram illustrates the refrigerant delivery path in the subcooling release mode. In subcooling release mode, as shown in the table above, the first control valve 307 and the second control valve 308 are open. The refrigerant entering the energy storage device 3 passes through the first control valve 307 and the second port 3102 into the energy storage heat exchanger 310, then flows out through the first port 3101, and finally through the second control valve 308 to the indoor unit for heat exchange. In other words, in subcooling release mode, the refrigerant undergoes subcooling in the energy storage heat exchanger before entering the indoor unit for heat exchange. In subcooling release mode, the refrigerant flows from the second port 3102 to the first port 3101 within the energy storage heat exchanger 310.

[0093] Figure 10 The refrigerant delivery path in the simultaneous cold storage and cooling mode is shown. In the simultaneous cold storage and cooling mode, as shown in the table above, expansion valve 306, fourth control valve 305, and fifth control valve 309 are open. This causes the refrigerant entering the energy storage device 3 to be split upstream of expansion valve 306. A portion of the refrigerant flows through expansion valve 306 into the energy storage heat exchanger 310 for cold storage and then flows back to the outdoor unit 1 through fifth control valve 309; the other portion flows through fourth control valve 305 to the indoor unit for cooling. In this mode, the cold storage flow path and the cooling flow path are connected in parallel.

[0094] Figure 11 The refrigerant delivery path in the conventional heating mode is shown. In the conventional heating mode, only the fourth control valve 305 is open. The refrigerant flowing out of the outdoor unit 1 flows into the indoor unit 2 through the first gas pipe 302 for heating, and then flows back into the outdoor unit 1 through the second liquid pipe 303. In the conventional heating mode, the refrigerant does not pass through the energy storage heat exchanger.

[0095] Figure 12 The refrigerant delivery path in heat storage mode is shown. In heat storage mode, the refrigerant does not enter the indoor unit, but instead passes through the energy storage heat exchanger 310 for heat storage.

[0096] Figure 13 The refrigerant delivery path in defrosting heating mode is shown. In defrosting heating mode, the refrigerant flows between the energy storage heat exchanger and the outdoor unit. The refrigerant output by the compressor exchanges heat in the outdoor heat exchanger to melt the frost layer on the outdoor heat exchanger. The refrigerant then enters the energy storage heat exchanger 310 for further heat exchange, and the resulting gaseous refrigerant returns to the compressor's intake end, thus achieving a cycle.

[0097] like Figure 14 and Figure 15 As shown, for air conditioning systems that require energy storage device 3 to achieve fine-grained energy control when releasing energy, in addition to, as Figure 2In addition to the structure of the air conditioning system, a bypass branch and a third control valve 313 installed on the bypass branch are required. One end of the bypass branch can be connected to the first liquid pipe 301 or the second port 3102; the other end is connected to the second liquid pipe 303. In the subcooling release mode, when the accumulator releases the internally stored cold energy, the third control valve 313 is opened, and a portion of the refrigerant directly enters the indoor side through the third control valve 313, reducing the flow of high-temperature refrigerant entering the accumulator for heat exchange, slowing down the accumulator's release rate, and extending the energy release time.

[0098] Figure 14 or Figure 15 The air conditioning system shown can also switch between seven operating modes, and by adding a third control valve 313, finer control can be achieved in the subcooling and heat release mode. The switching methods for the seven operating modes of this air conditioning system are shown in the table below. The refrigerant flow paths for the seven operating modes can be found in [reference needed]. Figures 7 to 13 The description will not be repeated here.

[0099] In other embodiments, such as Figure 16 As shown, the fourth control valve 305 is adjusted to a valve with flow regulation function. In the subcooling release mode, the fourth control valve 305 is opened to a certain degree. A portion of the refrigerant directly enters the indoor side through the fourth control valve 305, reducing the flow of high-temperature refrigerant entering the accumulator for heat exchange, slowing down the accumulator's heat release rate, and extending the energy release time.

[0100] Figure 16 The air conditioning system shown can also switch between seven operating modes, and by making the opening of the fourth control valve 305 adjustable, fine-grained control can be achieved in the subcooling and heat release mode. The switching methods for the seven operating modes of this air conditioning system are shown in the table below. The refrigerant flow paths for the seven operating modes can be found in the table below. Figures 7 to 13 The description will not be repeated here.

[0101] like Figure 17 and Figure 18As shown, outdoor unit 1 has a low-pressure pipe 103, and correspondingly, energy storage device 3 has a low-pressure refrigerant pipe 312. The low-pressure refrigerant pipe 312 is connected to the low-pressure pipe 103 of outdoor unit 1. One end of the first refrigerant adjustment control valve 3113 is connected to the first liquid pipe 301 of the energy storage device, and the other end is connected to the inlet of the refrigerant adjustment tank 311; one end of the second refrigerant adjustment control valve 3114 is connected to the outlet of the refrigerant adjustment tank 311, and the other end is connected to the low-pressure refrigerant pipe 312 of the energy storage device. The first refrigerant adjustment control valve 3113 and the second refrigerant adjustment control valve 3114 have the function of switching refrigerant on and off. When the system has too much refrigerant, it needs to store refrigerant in the refrigerant adjustment tank. At this time, the first refrigerant adjustment control valve 3113 opens and the second refrigerant adjustment control valve 3114 closes, and the refrigerant enters the refrigerant adjustment tank. When the system has too little refrigerant, it needs to discharge the refrigerant in the refrigerant adjustment tank into the pipeline. At this time, the second refrigerant adjustment control valve 3114 opens and the first refrigerant adjustment control valve 3113 closes.

[0102] like Figures 3 to 6 As shown, the energy storage heat exchanger 310 includes at least an energy storage medium storage chamber 3103, a heat exchange branch pipe 3104, a first collector 3107, a second collector 3105, and an intermediate connecting pipe 3106. Wherein:

[0103] The energy storage heat exchanger 310 has a first port 3101 and a second port 3102 located at opposite ends in a first direction X. The first port 3101 is connected to at least two corresponding heat exchange tube groups 3109 via at least two first collectors 3107. The at least two heat exchange tube groups 3109 are arranged opposite each other and in parallel in a second direction Y. The second direction Y is perpendicular to the first direction X. Each heat exchange tube group 3109 includes multiple parallel and connected heat exchange branch pipes 3104. The multiple heat exchange branch pipes 3104 are spaced apart in the first direction X. One end of each heat exchange branch pipe 3104 is connected to a first collector 3107 via an intermediate connecting pipe 3106, and the other end is connected to a second collector 3105. Multiple heat exchange branch pipes form a heat exchange tube group. The energy storage heat exchanger contains multiple heat exchange tube groups, the total number of which is an even number, and they are symmetrically distributed.

[0104] Within each heat exchanger tube group, the refrigerant flow path within the multiple heat exchanger branch pipes 3104 can be either unidirectional or staggered. The unidirectional flow path, such as... Figure 3 and Figure 4 As shown, the refrigerant, after exiting the first manifold 3107, splits into multiple branches. All branches receive liquid from the same end, undergo heat exchange via heat exchange branch pipes 3104, and then exit from the other end. This structure is simple, facilitates pipe routing, and is suitable for scenarios requiring uniform heat exchange in energy storage heat exchange coils. The staggered flow pattern is as follows... Figure 5 and Figure 6As shown, after the refrigerant comes out of the first collector 3107, it is divided into multiple branches. The liquid inlet and liquid outlet of adjacent branches are staggered, that is, the liquid inlet of one branch and the liquid outlet of the adjacent branch are on the same side.

[0105] The heat exchange tube assembly inside the energy storage heat exchanger in this embodiment adopts a symmetrical structure design to solve the problem of uneven heat exchange caused by excessive pressure loss in the single-pass pipeline flow process. At the same time, the symmetrical structure design helps to ensure uniform liquid distribution between different flow paths inside the energy storage device, avoiding the problem of insufficient or excessive energy storage in some areas, and improving the overall energy storage efficiency of the energy storage device.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in this application.

Claims

1. An air conditioning system, characterized by, The application relates to an air conditioning system, comprising: an outdoor unit (1); an indoor unit (2); and an energy storage device (3) connected between the outdoor unit (1) and the indoor unit (2), wherein the energy storage device (3) comprises an energy storage heat exchanger (310) having a first port (3101) and a second port (3102) at two ends respectively, and comprising an energy storage medium storage cavity (3103) for storing energy storage medium and a refrigerant heat exchange pipe arranged in the energy storage medium storage cavity (3103), wherein the refrigerant heat exchange pipe comprises at least two heat exchange pipe groups arranged oppositely and in parallel, the first ends of the at least two heat exchange pipe groups are connected with the first port (3101), and the second ends of the at least two heat exchange pipe groups are connected with the second port (3102). The heat exchange pipe group comprises a plurality of heat exchange branch pipes (3104) arranged in parallel and at intervals, and each heat exchange branch pipe (3104) is connected with the first port (3101) and the second port (3102) respectively.

2. The air conditioning system of claim 1, wherein, The plurality of heat exchange branch pipes (3104) are parallel to each other, each heat exchange branch pipe (3104) has a first interface connected with the first port (3101) and a second interface connected with the second port (3102), one of the first interface and the second interface is an inlet, and the other is an outlet, the outlets of the plurality of heat exchange branch pipes (3104) are located at the same end, and the inlets of the plurality of heat exchange branch pipes (3104) are arranged at the opposite end of the outlets; or the inlets of two adjacent heat exchange branch pipes (3104) in the plurality of heat exchange branch pipes (3104) are arranged at the same end of the outlets, and the inlet of the other heat exchange branch pipe (3104) is arranged at the opposite end of the outlets.

3. The air conditioning system of claim 2, wherein, The energy storage heat exchanger (310) further comprises a plurality of intermediate connecting pipes (3106) arranged between the first port (3101) and the heat exchange pipe group, the plurality of intermediate connecting pipes (3106) are arranged one by one corresponding to the plurality of heat exchange branch pipes (3104), the intermediate connecting pipes (3106) are flexible pipes, wherein the intermediate connecting pipes (3106) are distributed on one side of the plurality of heat exchange branch pipes (3104); or part of pipe sections of the intermediate connecting pipes (3106) are distributed on the opposite side of the plurality of heat exchange branch pipes (3104).

4. The air conditioning system of claim 1, wherein, ​ 5. The air conditioning system of any one of claims 1 to 4, wherein, The outdoor unit (1) comprises an outdoor unit liquid pipe (101) and an outdoor unit gas pipe (102), the indoor unit (2) comprises an indoor unit liquid pipe (201) and an indoor unit gas pipe (202), the energy storage device (3) further comprises a first liquid pipe (301) connected with the outdoor unit liquid pipe (101), a first gas pipe (302) connected with the outdoor unit gas pipe (102), a second liquid pipe (303) connected with the indoor unit liquid pipe (201), a second gas pipe (304) connected with the indoor unit gas pipe (202), and a control valve assembly, the first gas pipe (302) is in communication with the second gas pipe (304), the control valve assembly is actuated to switch the air conditioning system between different working modes, the control valve assembly comprises a first control valve (307) and a second control valve (308), a first end of the first control valve (307) is connected with the first liquid pipe (301), a second end of the first control valve (307) is connected with the second port (3102), a first end of the second control valve (308) is connected with the first port (3101), a second end of the second control valve (308) is connected with the second liquid pipe (303); The working mode comprises a supercooling refrigeration mode, in the supercooling refrigeration mode, the first control valve (307) and the second control valve (308) are configured to be opened to form the energy storage heat exchanger (310) into a supercooler, the refrigerant output by the outdoor unit liquid pipe (101) enters the energy storage device (3) through the first liquid pipe (301), enters the second port (3102) of the energy storage heat exchanger (310) through the first control valve (307) and flows out through the first port (3101) of the energy storage heat exchanger (310) and then flows to the second liquid pipe (303) through the second control valve (308).

6. The air conditioning system of claim 5, wherein, The energy storage device (3) further comprises a bypass branch, a first end of the bypass branch is connected with the first liquid pipe (301), a second end of the bypass branch is connected with the second liquid pipe (303), and the bypass branch is provided to be on-off, in the supercooling refrigeration mode, the bypass branch is configured to be communicated to make part of the refrigerant entering the energy storage device (3) through the first liquid pipe (301) flow to the second liquid pipe (303) directly through the bypass branch.

7. The air conditioning system of claim 6, wherein, The first end of the bypass branch is directly connected with the first liquid pipe (301); or, the first end of the bypass branch is directly connected with the second port (3102).

8. The air conditioning system of claim 6, wherein, A third control valve (313) for controlling the on-off of the bypass branch is arranged on the bypass branch.

9. The air conditioning system of claim 5, wherein, The control valve assembly further comprises a fourth control valve (305) arranged between the first liquid pipe (301) and the second liquid pipe (303) and the opening degree of the fourth control valve (305) is adjustably arranged, and the working modes further comprise a normal refrigeration mode, in the normal refrigeration mode, the fourth control valve (305) is configured to be opened at a full opening degree, and the first control valve (307) and the second control valve (308) are configured to be closed; in the supercooling refrigeration mode, the fourth control valve (305) is configured to be closed or opened at a set opening degree smaller than the full opening degree.

10. The air conditioning system of claim 5, wherein, The control valve assembly further comprises an expansion valve (306) arranged between the first liquid pipe (301) and the first port (3101) and a fifth control valve (309) arranged between the second port (3102) and the first gas pipe (302), and the working modes further comprise a cold accumulation mode, in the cold accumulation mode, the first control valve (307) and the second control valve (308) are configured to be closed, and the expansion valve (306) and the fifth control valve (309) are opened so that the refrigerant output by the outdoor unit liquid pipe (101) enters the energy storage device (3) through the first liquid pipe (301), enters the first port (3101) of the energy storage heat exchanger (310) through the expansion valve (306) and flows out through the second port (3102) of the energy storage heat exchanger (310) and then flows to the first gas pipe (302) through the fifth control valve (309). 11.The air conditioning system of claim 10, wherein, The control valve assembly further comprises a fourth control valve (305) arranged between the first liquid pipe (301) and the second liquid pipe (303) to control the on-off of the flow path, and the working modes further comprise a cold accumulation and refrigeration mode, in the cold accumulation and refrigeration mode, the fourth control valve (305), the expansion valve (306) and the fifth control valve (309) are configured to be opened, and the first control valve (307) and the second control valve (308) are configured to be closed.

12. The air conditioning system of claim 5, wherein, The working modes further comprise at least one of a normal heating mode, a heat accumulation mode and a defrosting and heat releasing mode.

13. The air conditioning system of claim 5, wherein, The energy storage device (3) further comprises a low-pressure refrigerant pipe (312), the outdoor unit (1) further comprises a low-pressure pipe (103), the low-pressure refrigerant pipe (312) is connected with the low-pressure pipe (103), and the energy storage device (3) further comprises a refrigerant adjusting tank (311), a first refrigerant adjusting control valve (3113) and a second refrigerant adjusting control valve (3114) arranged between a first end of the first control valve (307) and the low-pressure refrigerant pipe (312).

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