Dehumidifying and reheating air conditioning system

Abstract

The invention relates to the technical field of air conditioners, particularly provides a dehumidification and reheating air conditioning system, and aims to solve the problems of complex dehumidification and reheating structure, poor dehumidification and reheating effect and high cost of an air conditioning system in the prior art. In order to achieve the purpose, the air conditioning system comprises an indoor unit and an outdoor unit, the indoor unit comprises an indoor heat exchanger, the outdoor unit comprises an outdoor heat exchanger, the air conditioning system further comprises a first pipeline, a second pipeline and a third pipeline, and the first pipeline and the second pipeline are used for communicating the indoor unit with the outdoor unit; the air conditioning system further comprises a dehumidification valve, the indoor heat exchanger comprises a first heat exchange unit and a second heat exchange unit which are communicated in series, and the dehumidification valve is arranged between the first heat exchange unit and the second heat exchange unit. And one of the outdoor heat exchanger and the third pipeline can be selectively in a closed state. By means of the scheme, dehumidification and reheating of the air conditioner can be achieved at low cost by simplifying and transforming the structure, and the experience feeling of a user is improved.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, and specifically provides a dehumidification and reheating air conditioning system. Background Art

[0002] As people's living standards improve, users have higher and higher requirements for indoor air quality. Simple temperature control can no longer meet people's health needs, and intelligent temperature and humidity control has become the development direction of the air-conditioning industry. Traditional air conditioners are mainly used to adjust the temperature and can effectively handle sensible heat loads. Although they have dehumidification functions, it is known from the dehumidification principle that in the process of handling latent heat loads, the evaporation temperature needs to be set lower than the dew point temperature, resulting in a low system COP, and the dehumidification process is often accompanied by cooling. Therefore, developing an air conditioner with temperature control and dehumidification functions so that the air conditioning capacity matches the building load, while improving the thermal comfort of the room, appropriately reducing the energy consumption of the air-conditioning system, is of great value to the future development of the air-conditioning industry.

[0003] The dehumidification mode of traditional air-conditioning devices is accompanied by a cooling process, which affects the thermal comfort of the human body. In order to achieve dehumidification and reheating, an electric heating unit is generally added downstream of the dehumidification heat exchanger. However, the electric heating unit usually uses electric heating elements (such as heating wires, etc.) to convert electrical energy into thermal energy, so that the air absorbs heat when it flows through, thereby increasing the outlet temperature, which will increase energy consumption. In addition, the airflow after heat exchange by the electric heating element will have uneven temperature distribution due to uneven heating, which reduces human comfort. Daikin Air Conditioning has launched a three-pipe dehumidification and reheat air conditioning device (patent application number: 201811298875.9). The system pipelines are relatively complex and there are many valve components.

[0004] Accordingly, the art needs a new air conditioning system to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problems, namely, to solve the problems of complex dehumidification and reheating structure, poor dehumidification and reheating effect, and high cost of the air-conditioning system in the prior art. To this end, the present invention provides a dehumidification and reheating air-conditioning system, which includes an indoor unit and an outdoor unit, the indoor unit includes an indoor heat exchanger, the outdoor unit includes an outdoor heat exchanger, the air-conditioning system also includes a first pipeline, a second pipeline and a third pipeline, the first pipeline and the second pipeline are used to connect the indoor unit and the outdoor unit, the third pipeline is arranged in the outdoor unit and connected in parallel with the outdoor heat exchanger, the air-conditioning system also includes a dehumidification valve, the indoor heat exchanger includes a first heat exchange unit and a second heat exchange unit connected in series, the dehumidification valve is arranged between the first heat exchange unit and the second heat exchange unit, and the outdoor heat exchanger and the third pipeline can selectively make one of them in a passage state.

[0006] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the outdoor unit further includes a commutation unit, which is communicated with the outdoor heat exchanger and the third pipeline, and the commutation unit can selectively put the outdoor heat exchanger and the third pipeline in a through state.

[0007] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the commutation unit further includes a first solenoid valve and a second solenoid valve. The first solenoid valve is arranged on the third pipeline, and the second solenoid valve is arranged between the inlet end of the outdoor heat exchanger and the inlet end of the third pipeline.

[0008] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the indoor unit further includes an electronic expansion valve. One end of the electronic expansion valve is communicated with both the third pipeline and the outdoor heat exchanger through the first pipeline, and the other end is communicated with the indoor heat exchanger.

[0009] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the outdoor unit further includes a compressor and a four-way reversing valve. One interface of the four-way reversing valve is communicated with the second heat exchange unit through the second pipeline, the other two interfaces of the four-way reversing valve are respectively communicated with the inlet and the outlet of the compressor, and the remaining one interface of the four-way reversing valve is selectively communicated with the third pipeline and the outdoor heat exchanger.

[0010] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, a plurality of indoor units are provided, and the plurality of indoor units are connected in parallel.

[0011] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the commutation unit is a three-way valve, the outdoor heat exchanger and the third pipeline are both communicated with the three-way valve, and the three-way valve can selectively put the outdoor heat exchanger and the third pipeline in a through state.

[0012] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the indoor unit further includes a fan, the fan is arranged on one side of the second heat exchange unit, and the air outlet direction of the fan sequentially passes through the second heat exchange unit and the first heat exchange unit.

[0013] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the air-conditioning system further includes a dehumidification module, the dehumidification module is arranged in the indoor unit, and the dehumidification module is electrically connected with the dehumidification valve.

[0014] In the above specific embodiment of the dehumidifying and reheating air-conditioning system, the air-conditioning system further includes a control module, and the control module is electrically connected with the four-way reversing valve and the commutation unit.

[0015] In the case of adopting the above technical solution, the present invention optimizes and improves the pipeline system and structure of the air-conditioning system. A third pipeline is installed on both sides of the outdoor heat exchanger part of the outdoor unit, and the indoor unit and the outdoor unit are connected through a first pipeline and a second pipeline. The indoor heat exchanger of the indoor unit is divided into a first heat exchange unit and a second heat exchange unit. A dehumidification valve is arranged between the first heat exchange unit and the second heat exchange unit. By controlling the opening degree of the dehumidification valve, the second heat exchange unit is in a low-temperature state, and the first heat exchange unit is in a relatively high-temperature state, so that the air flow passing through the second heat exchange unit and the first heat exchange unit in sequence is dehumidified first and then heated, so as to achieve the purpose of dehumidification and reheating. Different from the prior art, the indoor unit and the outdoor unit of this air-conditioning system are connected by two pipes, and two kinds of dehumidification and reheating effects of constant-temperature dehumidification and temperature-rising dehumidification can be realized. Compared with the complex air-conditioning system for dehumidification and reheating in the prior art, the function of dehumidification and reheating can be realized by a simpler and more efficient structure. The air-conditioning system of the present invention relies on the independent transformation of the indoor unit and the outdoor unit, with a simplified structure, which is beneficial to match with the building. The heat at the outlet of the outdoor heat exchanger or the heat of the compressor exhaust is used for reheating, and the reheating cost is low, which more meets the user's usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention will be described below with reference to the drawings, in which:

[0017] Figure 1 is a schematic layout structure diagram of the air-conditioning system in the present invention;

[0018] Figure 2 is a schematic diagram of a partial heat recovery working mode of the air-conditioning system in the present invention, in which the connected state with the first solenoid valve closed is shown;

[0019] Figure 3 is a schematic diagram of the full heat recovery working mode of the air-conditioning system in the present invention, in which the connected state with the second solenoid valve closed is shown;

[0020] Figure 4 is a schematic layout structure diagram of another embodiment of the air-conditioning system in the invention, in which the structure of multiple indoor units connected in parallel is shown;

[0021] Figure 5 is a schematic layout structure diagram of another embodiment of the air-conditioning system in the invention, in which the connection structure of the three-way valve is shown.

[0022] In the figure: 1, indoor unit; 2, outdoor unit; 3, indoor heat exchanger; 4, outdoor heat exchanger; 5, first pipeline; 6, second pipeline; 7, third pipeline; 8, dehumidification valve; 9, first heat exchange unit; 10, second heat exchange unit; 11, commutation unit; 12, first solenoid valve; 13, second solenoid valve; 14, electronic expansion valve; 15, compressor; 16, four-way commutation valve. Detailed implementation manners

[0023] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not used to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0024] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, ordinal numbers such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] As Figure 1 shown, the present invention provides a dehumidifying and reheating air-conditioning system, including an indoor unit 1 and an outdoor unit 2. The indoor unit 1 includes an indoor heat exchanger 3, and the outdoor unit 2 includes an outdoor heat exchanger 4. The air-conditioning system further includes a first pipeline 5, a second pipeline 6 and a third pipeline 7. The first pipeline 5 and the second pipeline 6 are used to connect the indoor unit 1 and the outdoor unit 2. The third pipeline 7 is arranged in the outdoor unit 2 and is connected in parallel with the outdoor heat exchanger 4. The air-conditioning system further includes a dehumidification valve 8. The indoor heat exchanger 3 includes a first heat exchange unit 9 and a second heat exchange unit 10 connected in series. The dehumidification valve 8 is arranged between the first heat exchange unit 9 and the second heat exchange unit 10. The outdoor heat exchanger 4 and the third pipeline 7 can selectively make one of them in a through state.

[0027] In this embodiment, a dehumidifying and reheating air-conditioning system is proposed. It is divided into an indoor unit 1 and an outdoor unit 2. The indoor unit 1 and the outdoor unit 2 are connected through a first pipeline 5 and a second pipeline 6 to form a closed loop, and the refrigerant circulates in the loop to achieve basic air-conditioning functions. Based on the above structural form, the dehumidifying and reheating air-conditioning system proposed in this application improves the structures of the indoor unit 1 and the outdoor unit 2 respectively. The part of the outdoor unit 2 includes an outdoor heat exchanger 4, and the part of the indoor unit 1 includes an indoor heat exchanger 3. A bypass pipeline, that is, a third pipeline 7, is connected between the inlet end and the outlet end of the outdoor heat exchanger 4. The indoor heat exchange unit of the indoor unit 1 is divided into a first heat exchange unit 9 and a second heat exchange unit 10, and the two are connected. The first heat exchange unit 9 and the second heat exchange unit 10 are connected through a dehumidification valve 8.

[0028] During operation, the indoor unit 1 and the outdoor unit 2 form a cycle. The third pipeline 7 and the outdoor heat exchanger 4 can be selectively switched to a path state by controlling the on-off, and then different working modes are formed. Specifically, when the third pipeline 7 is closed and the outdoor heat exchanger 4 remains in the path state, when circulating to the indoor unit 1, throttling control is performed before entering the indoor heat exchanger 3, and the indoor heat exchanger 3 remains at a low temperature. At this time, the dehumidification valve 8 is fully open, and both the first heat exchange unit 9 and the second heat exchange unit 10 are in a low-temperature state. At this time, it is the refrigeration mode.

[0029] It can be imagined that, as Figure 2 shown, appropriate throttling control is performed before the refrigerant enters the first heat exchange unit 9, so that the first heat exchange unit 9 can maintain a relatively higher temperature and can utilize the temperature at the outlet of the outdoor heat exchanger 4. The dehumidification valve 8 adjusts the opening degree for throttling to lower the temperature of the second heat exchange unit 10. When the air-conditioning system adjusts the temperature, the air flow passes through the second heat exchange unit 10 and the first heat exchange unit 9 in sequence. The temperature in the second heat exchange unit 10 will be lower than the dew point temperature, and the water vapor in the air will condense to dehumidify. Although the humidity of the dehumidified air decreases, the temperature will also be relatively low. When passing through the first heat exchange unit 9, the air is heated to achieve the effect of dehumidifying and reheating. Considering that the first heat exchange unit 9 uses the residual temperature at the outlet end of the outdoor heat exchange unit at this time, this mode is partial regenerative dehumidification.

[0030] In a possible implementation manner, as Figure 3As shown, the outdoor heat exchanger 4 of the air conditioning system is in a closed passage state, the third pipeline 7 is in a passage state, the refrigerant does not throttle before entering the first heat exchange unit 9, the dehumidification valve 8 adjusts the opening degree for throttling control, and the refrigerant enters the second heat exchange unit 10. At this time, the first heat exchange unit 9 is heated by the exhaust temperature at the outlet of the compressor 15. The second heat exchange unit 10 is in a low temperature state after throttling by the dehumidification valve 8. At this time, the temperature of the second heat exchange unit 10 is still lower than the dew point temperature, and the water vapor in the air will condense to dehumidify. The air flow passes through the first heat exchange unit 9 for reheating. This working mode is a full heat recovery working mode, using the temperature at the exhaust port of the compressor 15.

[0031] It should be noted that the above working mode can be flexibly selected according to actual use requirements. Based on the description of the above embodiments, it can be seen that the indoor unit 1 and the outdoor unit 2 of the air conditioning system of the present invention still maintain the double-pipeline connection mode. The improvements are all in the individual parts of the indoor unit 1 or the outdoor unit 2. Therefore, after the structure is greatly simplified, more working modes can be obtained. Some of the heat recovery dehumidification methods are applicable to ordinary dehumidification environments. However, when the environment is low temperature and high humidity, it is difficult to meet the requirements only by using the residual temperature of the outdoor heat exchanger 4. Therefore, the temperature at the exhaust port of the compressor 15 is used. The above embodiments can all provide users with a comfortable body feeling temperature and environment.

[0032] Furthermore, the outdoor unit 2 further includes a commutation unit 11. The commutation unit 11 is connected to the outdoor heat exchanger 4 and the third pipeline 7, and the commutation unit 11 can selectively make the outdoor heat exchanger 4 and the third pipeline 7 in a passage state.

[0033] In this embodiment, the outdoor heat exchanger 4 and the third pipeline 7 of the outdoor unit 2 can be selectively in a passage state, which is adjusted according to the use requirements of the air conditioner. Specifically, the outdoor heat exchanger 4 and the third pipeline 7 need to be adjusted by corresponding control components to switch the connection state of the pipelines during use. Therefore, a corresponding commutation unit 11 component can be set as the control component. The commutation unit 11 is connected to both the outdoor heat exchanger 4 and the third pipeline 7. By adjusting the opening and closing mode of the commutation unit 11, the working states of the third pipeline 7 and the outdoor heat exchanger 4 can be switched to control the on-off of the two.

[0034] Furthermore, the commutation unit 11 further includes a first solenoid valve 12 and a second solenoid valve 13. The first solenoid valve 12 is arranged on the third pipeline 7, and the second solenoid valve 13 is arranged between the inlet end of the outdoor heat exchanger 4 and the inlet end of the third pipeline 7.

[0035] In this embodiment, the commutation unit 11 can control the on-off of the outdoor heat exchange unit and the third pipeline 7 by adopting a combined valve. Specifically, two solenoid valves can be used. The first solenoid valve 12 is installed on the third pipeline 7, and the second solenoid valve 13 is installed between the inlet of the outdoor heat exchanger 4 and the inlet end of the third pipeline 7. By controlling the closing of the first solenoid valve 12 or the second solenoid valve 13, the outdoor heat exchange unit and the third pipeline 7 can be made to maintain an alternative path state. The solenoid valve has a fast control response speed and can be quickly switched according to the usage requirements.

[0036] Further, the indoor unit 1 further includes an electronic expansion valve 14. One end of the electronic expansion valve 14 is communicated with both the third pipeline 7 and the outdoor heat exchanger 4 through the first pipeline 5, and the other end is communicated with the indoor heat exchanger 3.

[0037] In this embodiment, the air-conditioning system is also provided with an electronic expansion valve 14. The electronic expansion valve 14 is connected into the system through a pipeline and is located inside the indoor unit 1. The outlet ends of the outdoor heat exchanger 4 and the third pipeline 7 are gathered together and are both communicated with one end of the electronic expansion valve 14 through the first pipeline 5. The other end of the electronic expansion valve 14 is connected to the indoor heat exchanger 3. Specifically, the other end of the electronic expansion valve 14 is communicated with the first heat exchange unit 9. The electronic expansion valve 14 can adjust the opening degree and play a throttling role. The electronic expansion valve 14 adopts electronic control, has a fast response speed and high control precision, and can accurately control the temperature when the air-conditioning system is refrigerating.

[0038] Further, the outdoor unit 2 further includes a compressor 15 and a four-way reversing valve 16. One interface of the four-way reversing valve 16 is communicated with the second heat exchange unit 10 through the second pipeline 6. The other two interfaces of the four-way reversing valve 16 are respectively communicated with the inlet and outlet of the compressor 15. The remaining one interface of the four-way reversing valve 16 is selectively communicated with the third pipeline 7 and the outdoor heat exchanger 4.

[0039] In this embodiment, the outdoor unit 2 is also installed with a compressor 15 and a four-way reversing valve 16. The four-way reversing valve 16 has four interfaces. One interface is communicated with the second heat exchange unit 10 through the second pipeline 6 for leading the refrigerant of the indoor unit 1 to the outdoor unit 2. The other two ports of the four-way reversing valve 16 are communicated with the compressor 15. The last port is connected to both the outdoor heat exchanger 4 and the third pipeline 7 through the internal pipeline of the outdoor unit 2. However, through the commutation unit 11, the four-way reversing valve 16 is selectively communicated with the outdoor heat exchanger 4 and the third pipeline 7. The refrigerant will selectively enter the outdoor heat exchange unit or the third pipeline 7 after passing through the compressor 15 and then through the four-way reversing valve 16.

[0040] Further, a plurality of indoor units 1 are provided, and the plurality of indoor units 1 are connected in parallel.

[0041] In this embodiment, referring to Figure 4 , the indoor unit 1 can be multiple groups of units. One outdoor unit 2 can form an air conditioning system with multiple indoor units 1 through two pipes. The indoor units 1 adopt a parallel connection structure. The indoor units 1 can be installed in one place or installed at different positions through pipelines. By setting separate switches at the parallel positions, the indoor temperature and humidity at different positions can be adjusted, greatly improving the usage range of the air conditioner.

[0042] Furthermore, the commutation unit 11 is a three-way valve. The outdoor heat exchanger 4 and the third pipeline 7 are both connected to the three-way valve. The three-way valve can selectively put the outdoor heat exchanger 4 and the third pipeline 7 in a through state.

[0043] In this embodiment, referring to Figure 5 , the outdoor heat exchanger 4 and the third pipeline 7 of the outdoor unit 2 adopt a commutation unit 11 to keep one of them in a through state alternatively. The effect of keeping one of the outdoor heat exchanger 4 and the third pipeline 7 in a through state alternatively can also be achieved by adopting the structure of a three-way valve. The three-way valve can also be an electronic valve. By sending a signal to the electronic three-way valve, the on-off of the outlet ends on different sides of the three-way valve can be controlled to achieve commutation.

[0044] Furthermore, the indoor unit 1 further includes a fan. The fan is arranged on one side of the second heat exchange unit 10. The air outlet direction of the fan sequentially passes through the second heat exchange unit 10 and the first heat exchange unit 9.

[0045] In this embodiment, the indoor unit 1 needs to form an air flow that can sequentially blow through the second heat exchange unit 10 and the first heat exchange unit 9. The air flow cools down on the surface of the second heat exchange unit 10, causing the water vapor in the air to condense into water and reducing the moisture in the air. At the same time, the air flow will cool down and then pass through the first heat exchange unit. The first heat exchange unit 9 can use the remaining temperature of the outdoor heat exchanger 4 or directly use the temperature at the exhaust port of the compressor 15 to heat up the dehumidified air flow. Finally, the air blown into the room has a low humidity and a comfortable temperature, bringing a better experience to the user.

[0046] Furthermore, the air conditioning system further includes a dehumidification module. The dehumidification module is arranged in the indoor unit 1. The dehumidification module is electrically connected to the dehumidification valve 8.

[0047] In this embodiment, the air conditioning system further includes a dehumidification module. In the dehumidification mode, the dehumidification module controls the opening degrees of the electronic expansion valve 14 and the dehumidification valve 8. Further, the dehumidification module can be adjusted adaptively automatically during operation according to the humidity in the air. When the humidity is low, a partial regenerative dehumidification and reheating mode can be adopted. When the humidity is high, a full regenerative dehumidification and reheating mode can be selected. The electronic expansion valve 14 is preferably fully opened, and the dehumidification valve 8 throttles. During use, the opening degrees of the electronic expansion valve 14 and the dehumidification valve 8 can be adjusted adaptively as long as the second heat exchange unit 10 can be dehumidified at a low temperature and reheated by the second heat exchange unit 10.

[0048] Further, the air conditioning system further includes a control module, and the control module is electrically connected to the four-way reversing valve 16 and the reversing unit 11.

[0049] In this embodiment, the air conditioning system can also be provided with a control module, and the control module is used to control the working mode of the entire air conditioner. Specifically, it can control the reversing unit 11 of the outdoor unit 2. It can be imagined that by controlling the on-off of the first solenoid valve 12 and the second solenoid valve 13, the full regenerative dehumidification and reheating mode and the partial regenerative dehumidification and reheating mode are completed.

[0050] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A dehumidifying and reheating air conditioning system, characterized in that, The air conditioning system includes an indoor unit (1) and an outdoor unit (2). The indoor unit (1) includes an indoor heat exchanger (3), and the outdoor unit (2) includes an outdoor heat exchanger (4). The air conditioning system further includes a first pipeline (5), a second pipeline (6), and a third pipeline (7). The first pipeline (5) and the second pipeline (6) are used to connect the indoor unit (1) and the outdoor unit (2). The third pipeline (7) is arranged inside the outdoor unit (2) and is connected in parallel with the outdoor heat exchanger (4). The air conditioning system further includes a dehumidification valve (8). The indoor heat exchanger (3) includes a first heat exchange unit (9) and a second heat exchange unit (10) connected in series. The dehumidification valve (8) is arranged between the first heat exchange unit (9) and the second heat exchange unit (10). The outdoor heat exchanger (4) and the third pipeline (7) can selectively make one of them in a through state.

2. The dehumidifying and reheating air conditioning system according to claim 1, characterized in that, The outdoor unit (2) further includes a reversing unit (11). The reversing unit (11) is connected to the outdoor heat exchanger (4) and the third pipeline (7). The reversing unit (11) can selectively make the outdoor heat exchanger (4) and the third pipeline (7) in a through state.

3. The dehumidifying and reheating air-conditioning system according to claim 2, wherein The reversing unit (11) further includes a first solenoid valve (12) and a second solenoid valve (13). The first solenoid valve (12) is arranged on the third pipeline (7), and the second solenoid valve (13) is arranged between the inlet end of the outdoor heat exchanger (4) and the inlet end of the third pipeline (7).

4. The dehumidifying and reheating air-conditioning system according to claim 1 or 3, characterized in that, The indoor unit (1) further includes an electronic expansion valve (14). One end of the electronic expansion valve (14) is connected to both the third pipeline (7) and the outdoor heat exchanger (4) through the first pipeline (5), and the other end is connected to the indoor heat exchanger (3).

5. The dehumidifying and reheating air conditioning system according to claim 4, characterized in that, The outdoor unit (2) further includes a compressor (15) and a four-way reversing valve (16). One interface of the four-way reversing valve (16) is connected to the second heat exchange unit (10) through the second pipeline (6). The other two interfaces of the four-way reversing valve (16) are respectively connected to the inlet and outlet of the compressor (15). The remaining one interface of the four-way reversing valve (16) can be selectively connected to the third pipeline (7) and the outdoor heat exchanger (4).

6. The dehumidifying and reheating air-conditioning system according to claim 5, characterized in that, A plurality of indoor units (1) are provided, and the plurality of indoor units (1) are connected in parallel.

7. The dehumidifying and reheating air conditioning system according to claim 2, wherein The reversing unit (11) is a three-way valve. The outdoor heat exchanger (4) and the third pipeline (7) are both connected to the three-way valve. The three-way valve can selectively make the outdoor heat exchanger (4) and the third pipeline (7) in a through state.

8. The dehumidifying and reheating air conditioning system according to claim 6, wherein The indoor unit (1) further includes a fan. The fan is arranged on one side of the second heat exchange unit (10), and the air outlet direction of the fan sequentially passes through the second heat exchange unit (10) and the first heat exchange unit (9).

9. The dehumidifying and reheating air conditioning system according to claim 8, wherein, The air conditioning system further includes a dehumidification module. The dehumidification module is arranged inside the indoor unit (1), and the dehumidification module is electrically connected to the dehumidification valve (8).

10. The dehumidifying and reheating air conditioning system according to claim 9, wherein The air conditioning system further includes a control module, and the control module is electrically connected to the four-way reversing valve (16) and the reversing unit (11).

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