Air conditioning unit with heat exchange and heat storage module

Abstract

The utility model discloses a kind of air conditioning units with heat exchange heat storage module, the heat exchange heat storage module is set between four-way valve and outdoor heat exchanger, comprising: heat exchange box, first throttling device and first on-off valve, the heat exchange box is connected in series with the first throttling device and forms first branch, the first on-off valve is arranged on second branch parallel with the first branch, the heat exchange box is loaded with cold carrier, and multiple operating modes are realized by controlling the flow state of the heat exchange heat storage module. The utility model can effectively improve the poor heat dissipation caused by insufficient installation space, significantly improve the refrigeration efficiency, and at the same time, the cold carrier in the heat exchange heat storage module is used for heat exchange, the unit can realize continuous heating, improve user experience and comfort.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an air conditioning unit with a heat exchange and heat storage module. Background Technology

[0002] Currently, commercial residential buildings generally adopt standardized, high-density air conditioner outdoor unit installation designs, resulting in small installation spaces for air conditioner outdoor units, insufficient ventilation and heat dissipation conditions, and due to the tight spacing between adjacent outdoor units and the lack of effective heat dissipation channels around them, the heat dissipation of the units is obstructed during continuous operation, causing the casing temperature to rise significantly. This leads to problems such as decreased cooling efficiency, increased energy consumption, increased compressor load, increased operating noise, and even triggering overheat protection shutdown, seriously affecting the stability and service life of the air conditioning system and impacting the user experience.

[0003] On the other hand, in traditional air conditioning systems, during heating operation, a four-way valve is used to redirect the high-temperature, high-pressure gas discharged from the compressor into the indoor heat exchanger for heat exchange with the indoor air. The refrigerant condensing in the indoor heat exchanger is depressurized by a throttling device and then evaporates in the outdoor heat exchanger before returning to the compressor for recirculation. In winter, when the outdoor ambient temperature is very low, the outdoor heat exchanger is prone to frosting during heating, resulting in low heating capacity. Defrosting is then required for the outdoor heat exchanger. Current air conditioning systems, during defrosting, redirect the four-way valve, briefly switching the system to cooling mode, using the high-temperature, high-pressure gas discharged from the compressor to melt the frost on the outdoor heat exchanger. This defrosting process interrupts heating, causing the indoor heat exchanger to switch from heating to cooling, resulting in significant fluctuations in indoor temperature and a decreased user experience. Especially in northern regions where winter temperatures are very low, frequent defrosting further exacerbates room temperature instability, impacting user comfort.

[0004] Therefore, how to solve the problems of insufficient outdoor unit installation space and poor heat dissipation leading to reduced cooling efficiency of air conditioning units, poor system reliability, and frequent defrosting during winter heating that affects user experience are technical issues that the industry urgently needs to address. Utility Model Content

[0005] This utility model proposes an air conditioning unit with a heat exchange and heat storage module to solve the technical problems in the prior art, such as insufficient outdoor unit installation space and poor heat dissipation leading to reduced cooling efficiency, poor system reliability, and frequent defrosting during winter heating affecting user experience.

[0006] The technical solution adopted in this utility model is to design an air conditioning unit with a heat exchange and heat storage module, including a four-way valve and an outdoor heat exchanger, and also including a state-variable heat exchange and heat storage module, which is set between the four-way valve and the outdoor heat exchanger. It includes: a heat exchange box, a first throttling device and a first on-off valve. The heat exchange box and the first throttling device are connected in series to form a first branch. The first on-off valve is set on a second branch connected in parallel with the first branch. The heat exchange box is filled with a refrigerant. Multiple operating modes are realized by controlling the flow state of the heat exchange and heat storage module.

[0007] Furthermore, the air conditioning unit also includes a second throttling device and a third branch. One end of the third branch is connected to the pipe on the side of the indoor heat exchanger near the four-way valve, and the other end is connected to the pipe between the outdoor heat exchanger and the second throttling device. A second on / off valve is provided on the third branch.

[0008] Furthermore, the heat exchange box is equipped with a temperature detection device for detecting the temperature of the refrigerant.

[0009] Furthermore, the heat exchange box is equipped with a refrigerant inlet pipe and a refrigerant outlet pipe for connecting to an external refrigerant circulation device.

[0010] The air conditioning unit proposed in this utility model includes the following operating modes: cooling mode, heating mode, cooling heat recovery mode, heating defrosting mode, and heat recovery and heat storage mode.

[0011] This invention achieves multiple operating modes by controlling the flow state of the heat exchange and storage module, the opening and closing of the second throttling device and the second on / off valve.

[0012] In cooling mode, the first on / off valve is fully open, the first throttling device is closed, and the second throttling device is activated for throttling.

[0013] In heating mode, the first on / off valve is fully open, the first throttling device is closed, and the second throttling device is activated for throttling.

[0014] In the cooling and heat recovery mode, the first on / off valve is closed, the first throttling device is fully open, and the second throttling device is activated for throttling.

[0015] In the heating defrosting mode, the first on / off valve is closed, the first throttling device is activated to throttle, and the second throttling device is fully open.

[0016] In the first heat recovery and storage mode, the first on / off valve is closed, the first throttling device is activated for throttling, and the second throttling device is fully open.

[0017] In the second heat recovery and storage mode, the first on / off valve is closed, the first throttling device is open, the second throttling device is closed, and the second on / off valve is open.

[0018] In the third heat recovery and storage mode, the first on / off valve is closed, the first throttling device is activated, and both the second throttling device and the second on / off valve are activated.

[0019] Preferably, when the air conditioning unit is detected to meet the defrosting conditions, the first throttling device is opened, the first on / off valve is closed, and the second throttling device is fully opened, so that the air conditioning unit switches from heating mode to heating defrosting mode.

[0020] Preferably, when the ambient temperature is greater than or equal to the second preset temperature, or the refrigerant temperature is less than the third preset temperature, the first throttling device is fully opened, the first on / off valve is closed, and the second throttling device is opened, switching to the cooling heat recovery mode; when the ambient temperature is less than the second preset temperature, or the refrigerant temperature is greater than or equal to the third preset temperature, the cooling mode is maintained.

[0021] Compared with the prior art, the technical solution proposed in this utility model has the following advantages: 1. This utility model introduces a heat exchange and storage module with adjustable state. After the refrigerant passes through the heat exchange box, its temperature decreases, which can effectively improve the poor heat dissipation caused by insufficient installation space, significantly improve the cooling effect, and improve the cooling efficiency, thereby achieving energy saving.

[0022] 2. The heating and defrosting mode in this utility model uses a heat exchange and heat storage module to replace the defrosting method of switching through a four-way valve. By using the continuously circulating refrigerant for heat exchange, the unit can achieve continuous heating, ensure stable indoor temperature, and improve heating efficiency and user comfort.

[0023] 3. The refrigerant in the heating and defrosting module can be recycled and reused through external circulation, further saving energy.

[0024] 4. The system has a simple design structure, flexible operation mode switching, wide applicability, and low cost. Attached Figure Description

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a system diagram of the first embodiment of the air conditioning unit proposed in this utility model; Figure 2 This is a schematic diagram of the refrigerant flow direction in the refrigeration operation mode of the first embodiment; Figure 3 This is a schematic diagram of the refrigerant flow in the heating operation mode of the first embodiment; Figure 4This is a schematic diagram of the refrigerant flow direction in the cooling and heat recovery mode of the first embodiment; Figure 5 This is a schematic diagram of the refrigerant flow in the heating and defrosting mode of the first embodiment; Figure 6 This is a schematic diagram of the refrigerant flow direction in the heat recovery and heat storage mode of the first embodiment; Figure 7 This is a system diagram of the second embodiment of the air conditioning unit proposed in this utility model; Figure 8 This is a schematic diagram of the first type of refrigerant flow in the heat recovery and heat storage mode in the second embodiment; Figure 9 This is a schematic diagram of the second type of refrigerant flow in the heat recovery and heat storage mode in the second embodiment; Figure 10 This is a flowchart of the switching between the refrigeration mode and the refrigeration heat recovery mode of this utility model; Figure 11 This is a flowchart showing the switching between the heating mode and the heating defrosting mode of this utility model.

[0026] in: 1 Compressor, 2 Four-way valve, 3 Heat exchanger box, 4 First throttling device, 5 First on / off valve, 6 Refrigerant inlet pipe, 7 Refrigerant outlet pipe, 8 Outdoor heat exchanger, 9 Second throttling device, 10 Indoor heat exchanger, 11 First branch pipe, 12 Second branch pipe, 13 Third branch pipe, 14 Second on / off valve.

[0027] E-heat exchange and thermal storage module; t - runtime; t1 - Preset time; T 外环 -Ambient temperature; T 内环 -Indoor ambient temperature; T 设定 -Indoor set temperature T1 - First preset temperature; T2 - Second preset temperature; T3 - Third preset temperature; Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0029] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of protection of the invention.

[0030] While techniques, methods, and devices known to those skilled in the art are not discussed in detail herein, such techniques, methods, and devices should be considered part of this specification where appropriate. Any specific values ​​in this specification should be interpreted as merely exemplary and not as limiting the scope of this invention.

[0031] For ease of description, the terms used in the specification to describe position, such as "above", "to the left", "in front", etc., are only used to describe the spatial positional relationship between a certain component and other components in the embodiment shown in the figure. When the position of the component is different, the relative position will change. Therefore, the positional relationship of the embodiment in the figure should not constitute a limitation on the present invention.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" in the specification is merely for distinguishing similar components and does not imply any order of precedence. Therefore, it should not be construed as limiting the scope of protection of this utility model.

[0033] An air conditioning unit typically consists of two parts: an indoor unit and an outdoor unit. The indoor unit consists of an indoor heat exchanger (including a fan), while the outdoor unit consists of a compressor, a four-way valve, an outdoor heat exchanger (including a fan), and a throttling device.

[0034] The concept of this utility model is to add a variable-state heat exchange and heat storage module to the air conditioning unit. By changing the circulation state of the heat exchange and heat storage module, multiple operating modes of the air conditioning unit can be realized. At the same time, it solves the problems of small installation space for outdoor unit of air conditioning unit and poor user experience in defrosting air conditioning unit in winter.

[0035] The heat exchange and storage module proposed in this utility model is connected between a four-way valve and an outdoor heat exchanger. It includes a heat exchange box, a throttling device, and an on / off valve. The heat exchange box and the throttling device are connected in series, while the on / off valve is connected in parallel with both the heat exchange box and the throttling device. The heat exchange box contains a refrigerant and has a refrigerant inlet pipe and a refrigerant outlet pipe that can be connected to an external refrigerant circulation device. The heat exchange box also has a temperature detection device. When the refrigerant temperature reaches a set temperature, it can be drawn out through the refrigerant circulation device and used as a heat source.

[0036] Figure 1This is a system diagram of the first embodiment of the air conditioning unit proposed in this utility model. In this embodiment, the air conditioning unit includes a compressor 1, a four-way valve 2, a variable-state heat exchange and storage module E, an outdoor heat exchanger 8, a second throttling device 9, and an indoor heat exchanger 10, all connected sequentially via pipes. The heat exchange and storage module includes a heat exchange box 3, a first throttling device 4, and a first on / off valve 5. The heat exchange box and the first throttling device are connected in series on a first branch 11, and the first on / off valve is located on a second branch 12 connected in parallel with the first branch. The heat exchange box 3 contains a refrigerant, and is also equipped with a refrigerant inlet pipe 6 and a refrigerant outlet pipe 7 connected to an external refrigerant circulation device. The heat exchange box 3 is equipped with a temperature detection device for detecting the refrigerant temperature. When the refrigerant temperature reaches a set value, it can be drawn out through the refrigerant circulation device and used as a heat source.

[0037] The air conditioning unit proposed in this utility model can realize multiple operating modes by controlling the on / off state of the heat exchange and heat storage module E, specifically including: cooling mode, heating mode, cooling heat recovery mode, heating defrosting mode and heat recovery and heat storage mode.

[0038] Figure 2 This is a schematic diagram of the refrigerant flow in the cooling mode of the first embodiment. In the cooling mode, the first on / off valve 5 in the heat exchange and storage module E is fully open, and the first throttling device 4 is closed. The high-temperature and high-pressure refrigerant discharged from the compressor is condensed in the outdoor heat exchanger 8, and then throttled by the second throttling device 9. After evaporating and cooling in the indoor heat exchanger 10, it returns to the compressor 1 for circulation.

[0039] Figure 3 This is a schematic diagram of the refrigerant flow in the heating mode of the first embodiment. In the heating mode, the first on / off valve 5 in the heat exchange and storage module E is open, and the first throttling device 4 is closed. The high-temperature and high-pressure refrigerant discharged from the compressor is condensed in the indoor heat exchanger 10, then throttled by the second throttling device 9, and then evaporated in the outdoor heat exchanger 8 before returning to the compressor 1 via the first on / off valve 5 for circulation.

[0040] Figure 4 This is a schematic diagram of the refrigerant flow in the cooling and heat recovery mode of the first embodiment. In the cooling and heat recovery operation mode, the first on / off valve 5 in the heat exchange and heat storage module E is closed, and the first throttling device 4 is fully open. The high-temperature and high-pressure refrigerant discharged from the compressor first passes through the heat exchange box 3 for heat exchange, then passes through the outdoor heat exchanger 8 for heat exchange, and then passes through the second throttling device 9 for throttling, heat exchange and evaporation in the indoor heat exchanger 10, and then returns to the compressor 1 for circulation.

[0041] When the temperature of the heat transfer fluid in heat exchange box 3 reaches the first preset temperature T1, the external refrigerant circulation device is activated to export the heated heat transfer fluid (such as hot water) and replenish it with new heat transfer fluid flowing into the heat exchange box for heat exchange. After heat exchange in the heat exchange box, the refrigerant temperature decreases, which can effectively improve the poor heat dissipation caused by insufficient installation space, significantly improve the cooling effect, and improve cooling efficiency, thus achieving energy saving and power saving.

[0042] The first preset temperature T1 can be set as needed. If water is used as the refrigerant, the first preset temperature can be set between 30 and 100 degrees.

[0043] Figure 5 This is a schematic diagram of the refrigerant flow in the heating defrosting mode of the first embodiment. During heating defrosting mode operation, the first on / off valve 5 in the heat exchange and storage module E is closed, the first throttling device 4 is activated, and the second throttling device 9 is fully open. The high-temperature, high-pressure refrigerant discharged from the compressor condenses in the indoor heat exchanger 10, then passes through the second throttling device 9 to the outdoor heat exchanger 8 for further condensation. Afterward, it passes through the first throttling device 4, exchanges heat with the refrigerant in the heat exchange box 3, and returns to the compressor 1 for circulation.

[0044] In the heating and defrosting mode, the heat exchange box 3 plays an evaporation role, and the temperature of the refrigerant will continuously decrease. In order to ensure that the refrigerant does not solidify, a preset temperature can be set. When the temperature of the refrigerant reaches the preset temperature, the external refrigerant circulation device of the heat exchange box is connected to draw out the cooled refrigerant and replenish the new refrigerant to flow into the heat exchange box for heat exchange.

[0045] The aforementioned heating and defrosting mode replaces the defrosting method that uses a four-way valve to switch directions. By utilizing the continuously circulating refrigerant for heat exchange, the unit can achieve continuous heating, ensure stable indoor temperature, and improve heating efficiency and user comfort.

[0046] Figure 6 This is a schematic diagram of the refrigerant flow in the heat recovery and heat storage mode of the first embodiment. In the heat recovery and heat storage operation mode, the first on / off valve 5 in the heat exchange and heat storage module E is closed, the first throttling device 4 is open for throttling, and the second throttling device 9 is fully open. The high-temperature and high-pressure refrigerant discharged from the compressor first exchanges heat with the heat transfer fluid in the heat exchange box 3, then throttles through the first throttling device 4 and exchanges heat in the outdoor heat exchanger 8, and then passes through the second throttling device 9, exchanges heat and evaporates in the indoor heat exchanger 10, and returns to the compressor 1 for circulation. Since the refrigerant has already exchanged heat in the outdoor heat exchanger, the fan does not need to be turned on at this time, saving energy.

[0047] When the refrigerant temperature inside the heat exchanger box reaches the first preset temperature value T1, the external refrigerant circulation is activated. The refrigerant (such as hot water) that has completed heat exchange is exported for reuse, and new refrigerant is added and flows into the heat exchanger box for heat exchange. During the transitional season, if a small amount of cooling is required indoors, when the difference between the actual indoor ambient temperature and the set indoor ambient temperature reaches the preset difference value detected in the heat recovery and heat storage mode, the indoor heat exchanger 10 turns on the fan to perform heat exchange.

[0048] Figure 7 This is a system diagram of the second embodiment of the air conditioning unit proposed in this utility model. In this embodiment, the air conditioning unit includes a compressor 1, a four-way valve 2, a variable-state heat exchange and storage module E, an outdoor heat exchanger 8, a second throttling device 9, and an indoor heat exchanger 10, all connected sequentially by pipes. Unlike the first embodiment, a third branch 13 is provided at the end of the indoor heat exchanger 10 near the four-way valve and between the indoor heat exchanger 8 and the second throttling device 9, and a second on / off valve 14 is provided on this branch.

[0049] The second embodiment can also achieve multiple operating modes by controlling the on / off state of the heat exchange and heat storage module E, specifically including: cooling mode, heating mode, cooling and heat recovery mode, heating and defrosting mode, and heat recovery and heat storage mode. Among them, the control of cooling mode, heating mode, cooling and heat recovery mode, and heating and defrosting mode is the same as that of the first embodiment, and will not be described again here.

[0050] In the second embodiment, the heat recovery and storage mode can have several variations in addition to the same operation as the first embodiment: The first type is as follows Figure 8 As shown, the second on / off valve 14 is open, the second throttling device 9 is closed, the first on / off valve 5 in the heat exchange and heat storage module E is closed, and the first throttling device 4 is opened for throttling. The high-temperature and high-pressure refrigerant discharged from the compressor first passes through the heat exchange box 3 for heat exchange, and then passes through the first throttling device 4 for throttling. After heat exchange in the outdoor heat exchanger 8, it returns to the compressor 1 through the third branch 13 for circulation. The refrigerant does not enter the indoor side for heat exchange at all, reducing the fluctuation of indoor temperature.

[0051] The second method involves closing the second on / off valve 11 and setting the second throttling device 9 to full open when the actual inner ring temperature differs from the set inner ring temperature by a preset value. This allows the refrigerant to exchange heat through the indoor heat exchanger 10. The operating mode in this case is the same as in the first embodiment.

[0052] The third type is as follows Figure 9 As shown, when a small amount of cooling is needed indoors, the second on / off valve 14 and the second throttling device 9 are opened simultaneously to introduce some refrigerant to cool the room.

[0053] As can be seen, in the second embodiment, the introduction of the third branch 13 and the second on / off valve 14 enables the heat recovery and heat storage mode to adapt to various needs.

[0054] The air conditioning unit proposed in this utility model can not only achieve multiple operating modes by controlling the on / off state of the heat exchange and heat storage module, the opening and closing of the throttling device and the on / off valve, but also switch between multiple modes.

[0055] 1. Switching between normal cooling mode and cooling heat recovery mode.

[0056] The cooling mode and the cooling heat recovery mode can be set separately, and users can choose according to their needs.

[0057] Figure 10 This is a flowchart of the switching between the refrigeration mode and the refrigeration heat recovery mode of this utility model, including the following steps: When the air conditioning unit is turned on, it operates in cooling mode. At this time, the first on / off valve 5 is open, the first throttling device 4 is closed, and the second throttling device 9 is open for throttling. The system will switch to cooling and heat recovery mode if any of the following conditions are met: (1) When the actual ambient temperature T is detected. 外环 When the temperature is greater than or equal to the second preset temperature T2, the mode switches from cooling mode to cooling heat recovery mode. (2) When the actual inner ambient temperature T is detected 内环 The indoor set temperature T has not been reached after the preset time t1. 设定 When this happens, the mode switches from cooling mode to cooling heat recovery mode; (3) When the temperature of the heat transfer fluid in the heat exchange box is detected to be lower than the third preset temperature T3, the normal refrigeration mode is switched to the refrigeration heat recovery mode.

[0058] When switching to the cooling and heat recovery mode, the first throttling device 4 is fully open, the first on / off valve 5 is closed, and the second throttling device 9 is opened for throttling.

[0059] When none of the above three conditions are met, the system switches from cooling / heat recovery mode to cooling mode. During mode switching, the valves to be opened are opened first, and then the valves to be closed are closed.

[0060] 2. Switching between normal heating mode and heating defrosting mode.

[0061] The heating mode and the heating-defrosting mode can be set separately, and users can choose according to their needs.

[0062] When the user does not select a specific mode, the automatic switching between the two modes occurs as follows: when the unit is detected to meet the defrosting conditions, it switches from heating mode to heating-defrosting mode; otherwise, it operates in heating mode. During mode switching, the valves to be opened are opened first, followed by the valves to be closed.

[0063] Figure 11 This is a flowchart of the switching between the heating mode and the heating-defrosting mode of this utility model, including the following steps: When the air conditioning unit is turned on, it operates in heating mode. At this time, the first on / off valve 5 is open, the first throttling device 4 is closed, and the second throttling device 9 is opened to throttle. Determine whether the air conditioning unit meets the defrosting conditions. If not, maintain the heating mode operation; if it does, switch to the heating defrosting mode operation. When switching to the heating defrosting mode, the second throttling device 9 is fully open, the first throttling device 4 is opened for throttling, and the first on-off valve 5 is closed. After defrosting is complete, it will return to heating mode.

[0064] In this invention, the throttling device can be an electronic expansion valve, a thermostatic expansion valve, a throttling valve, or other throttling device with flow regulation function.

[0065] The on / off valve in this invention can be a solenoid valve, electronic expansion valve, or other valve with switching function. The fans in the indoor and outdoor heat exchangers can be centrifugal fans, axial fans, mixed-flow fans, cross-flow fans, etc.

[0066] The four-way valve in this invention can be replaced by multiple on / off valves or three-way valves.

[0067] The number of indoor units in this invention can be expanded to an indoor unit system with multiple indoor units connected in parallel. In this system, a throttling device needs to be installed on the connecting pipe of each indoor unit connected in parallel.

[0068] The technical solution proposed in this utility model has the following significant advantages: 1. By introducing a heat exchange and storage module with variable state, the refrigerant temperature decreases after passing through the heat exchange box, which can effectively improve the poor heat dissipation caused by insufficient installation space, significantly improve the cooling effect, and improve the cooling efficiency, thereby achieving energy saving.

[0069] 2. The heating and defrosting mode in this utility model uses a heat exchange and heat storage module to replace the defrosting method of switching through a four-way valve. By using the continuously circulating refrigerant for heat exchange, the unit can achieve continuous heating, ensure stable indoor temperature, and improve heating efficiency and user comfort.

[0070] The above description is merely a specific embodiment of this utility model. It should be noted that any modifications, equivalent substitutions, and variations made within the spirit and framework of this utility model should be included within the protection scope of this utility model.

Claims

1. An air conditioning unit with a heat exchange and storage module, comprising a four-way valve and an outdoor heat exchanger, characterized in that, A heat exchange and storage module is installed between the four-way valve and the outdoor heat exchanger. The heat exchange and storage module includes a heat exchange box, a first throttling device, and a first on / off valve. The heat exchange box and the first throttling device are connected in series to form a first branch. The first on / off valve is installed on a second branch connected in parallel with the first branch. The heat exchange box is filled with a refrigerant. Multiple operating modes are achieved by controlling the flow state of the heat exchange and storage module.

2. The air conditioning unit according to claim 1, characterized in that, The air conditioning unit also includes a second throttling device and a third branch. One end of the third branch is connected to the pipe on the side of the indoor heat exchanger of the air conditioning unit near the four-way valve, and the other end is connected to the pipe between the outdoor heat exchanger and the second throttling device of the air conditioning unit. A second on / off valve is provided on the third branch.

3. The air conditioning unit according to claim 1, characterized in that, The heat exchange box is equipped with a temperature detection device for detecting the temperature of the refrigerant.

4. The air conditioning unit according to claim 1, characterized in that, The heat exchange box is equipped with a refrigerant inlet pipe and a refrigerant outlet pipe for connecting to an external refrigerant circulation device.

5. The air conditioning unit according to claim 2, characterized in that, The operating modes include: cooling mode, heating mode, cooling heat recovery mode, heating defrosting mode, and heat recovery and heat storage mode.

6. The air conditioning unit according to claim 5, characterized in that, Multiple operating modes are achieved by controlling the flow state of the heat exchange and storage module, as well as the opening and closing of the second throttling device and the second on / off valve.

7. The air conditioning unit according to claim 5, characterized in that, In cooling mode, the first on / off valve is fully open, the first throttling device is closed, and the second throttling device is activated for throttling.

8. The air conditioning unit according to claim 5, characterized in that, In heating mode, the first on / off valve is fully open, the first throttling device is closed, and the second throttling device is activated for throttling.

9. The air conditioning unit according to claim 5, characterized in that, In the cooling and heat recovery mode, the first on / off valve is closed, the first throttling device is fully open, and the second throttling device is activated for throttling.

10. The air conditioning unit according to claim 5, characterized in that, In the heating defrosting mode, the first on / off valve is closed, the first throttling device is activated to throttle, and the second throttling device is fully open.

11. The air conditioning unit according to claim 5, characterized in that, In the first heat recovery and storage mode, the first on / off valve is closed, the first throttling device is activated for throttling, and the second throttling device is fully open.

12. The air conditioning unit according to claim 5, characterized in that, In the second heat recovery and storage mode, the first on / off valve is closed, the first throttling device is open, the second throttling device is closed, and the second on / off valve is open.

13. The air conditioning unit according to claim 5, characterized in that, In the third heat recovery and storage mode, the first on / off valve is closed, the first throttling device is activated, and both the second throttling device and the second on / off valve are activated.

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