Double-heat-source air conditioning unit

Abstract

The double-heat-source air conditioning unit comprises a refrigerant loop and a combustion module, the refrigerant loop comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger which are sequentially connected, the combustion module is connected with a heat recovery smoke exhaust pipeline, and an outlet of the heat recovery smoke exhaust pipeline is close to the outdoor heat exchanger. The indoor heat exchanger and the combustion module can supply heat to the indoor space, the combustion module is further connected with an outdoor smoke exhaust pipeline, an outlet of the outdoor smoke exhaust pipeline is far away from the outdoor heat exchanger, the heat recovery smoke exhaust pipeline is connected when the indoor heat exchanger and the combustion module supply heat to the indoor space, and the outdoor smoke exhaust pipeline is connected when the combustion module supplies heat to the indoor space independently. According to the utility model, the flue gas discharge pipeline of the combustion module is reasonably arranged, so that high-temperature flue gas discharged by combustion heating is effectively recovered when double-heat-source heating is started at the same time, the unit can efficiently and stably provide heating capacity, and the comfort of an indoor environment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a dual-heat source air conditioning unit. Background Art

[0002] For example, in northern China, where winters are cold, conventional heat pump units suffer from heating attenuation and are unable to meet heating needs. Relying solely on coal combustion for heating also consumes too much energy and is not conducive to energy conservation and emission reduction. Dual-heat-source air conditioning units, as efficient and versatile air conditioning systems, are gradually becoming the mainstream choice in the market.

[0003] The core of a dual-heat-source air conditioning unit lies in its ability to operate using either or both heat sources simultaneously. In heating mode, the unit not only absorbs low-grade heat from the outside air to raise the indoor temperature, but also generates high-temperature heat through a built-in burner (such as a gas or oil burner) to meet heating needs in freezing weather. This dual-heat-source design enables the unit to maintain efficient and stable operation even in extreme climates.

[0004] During the combustion process of dual-heat-source air conditioning units, the burner releases a large amount of high-temperature flue gas. This flue gas contains a wealth of thermal energy, but due to the limitations of traditional design concepts, it is often discharged directly into the outdoor environment, resulting in a large amount of heat energy waste. The unit needs to consume more energy to maintain the indoor temperature, increasing operating costs. In addition, the emission of high-temperature flue gas also causes thermal pollution to the surrounding environment and ecosystem, posing a potential threat to residents' quality of life and physical health.

[0005] Therefore, how to design a dual-heat source air-conditioning unit that can effectively improve energy utilization is a technical problem that needs to be solved urgently in the industry. Utility Model Content

[0006] In order to solve the defect that the existing dual-heat source air-conditioning unit directly discharges high-temperature flue gas into the outdoor environment, resulting in a large amount of heat energy waste, the utility model proposes a dual-heat source air-conditioning unit. By reasonably setting the flue gas exhaust pipe of the combustion module, when the dual heat source heating is turned on at the same time, the high-temperature flue gas discharged by the combustion heating is effectively recovered, the energy utilization rate is improved, and the unit can provide heating capacity efficiently and stably to ensure the comfort of the indoor environment.

[0007] The technical solution adopted by the utility model is to design a dual-heat source air-conditioning unit, including: a refrigerant circuit and a combustion module. The refrigerant circuit includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence. The combustion module is connected to a heat recovery and exhaust pipe. The outlet of the heat recovery and exhaust pipe is close to the outdoor heat exchanger. Both the indoor heat exchanger and the combustion module can supply heat to the indoor room.

[0008] Furthermore, the combustion module is also connected to an outdoor smoke exhaust duct, the outlet of the outdoor smoke exhaust duct is far away from the outdoor heat exchanger, and the on-off status of the heat recovery smoke exhaust duct and the outdoor smoke exhaust duct is adjustable; the heat recovery smoke exhaust duct is connected when the indoor heat exchanger and the combustion module both supply heat to the indoor room, and the outdoor smoke exhaust duct is connected when the combustion module alone supplies heat to the indoor room.

[0009] In some embodiments, the heat recovery smoke exhaust pipe and the outdoor smoke exhaust pipe are connected to the combustion module through a pipe diverter valve, and the pipe diverter valve is used to switch and connect the heat recovery smoke exhaust pipe or the outdoor smoke exhaust pipe.

[0010] Furthermore, the dual heat source air conditioning unit also includes: an indoor fan, which is located in the same air duct as the indoor heat exchanger and the flue gas heat exchanger of the combustion module to drive indoor air to flow through the indoor heat exchanger and the flue gas heat exchanger.

[0011] Furthermore, the dual-heat source air-conditioning unit also includes: an outdoor fan, which is used to drive outdoor air to flow through the outdoor heat exchanger, and the outlet of the heat recovery and exhaust duct is located on the air inlet side of the outdoor heat exchanger.

[0012] Furthermore, the dual-heat source air-conditioning unit also includes: a four-way valve connected to the refrigerant circuit, the four-way valve is used to switch the refrigerant flow direction of the refrigerant circuit, so that the indoor heat exchanger can supply heating or cooling to the room.

[0013] Furthermore, the dual-heat source air-conditioning unit further includes: a flash tank, which is connected in series between the outdoor heat exchanger and the indoor heat exchanger, and the air outlet of the flash tank is connected to the air supply port of the compressor.

[0014] Furthermore, the throttling device includes a first throttling valve and a second throttling valve, the first throttling valve is connected in series between the flash tank and the outdoor heat exchanger, and the second throttling valve is connected in series between the flash tank and the indoor heat exchanger.

[0015] Furthermore, the compressor, the outdoor heat exchanger and the throttling device are installed in the outdoor unit, and the indoor heat exchanger and the combustion module are installed in the indoor unit.

[0016] In some embodiments, the dual heat source air conditioning unit is a dual heat source heat pump unit.

[0017] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0018] 1. Design a heat recovery exhaust duct with its outlet close to the outdoor heat exchanger. Use the heat recovery exhaust duct to discharge the high-temperature flue gas generated by combustion to the outdoor heat exchanger. When the refrigerant circuit and the combustion module are heating simultaneously, the outdoor heat exchanger can efficiently recover the high-temperature flue gas emitted by the combustion heating, thereby improving energy utilization and enabling the unit to provide efficient and stable heating, ensuring a comfortable indoor environment.

[0019] 2. Design an outdoor smoke exhaust duct with its outlet away from the outdoor heat exchanger. Use the outdoor smoke exhaust duct to discharge the high-temperature smoke generated by combustion directly to the outside. When the combustion module alone provides heat to the room, the combustion module can work reliably on its own.

[0020] 3. The indoor heat exchanger and combustion module share the indoor fan. When the indoor fan is working, it drives the indoor air to flow through the indoor heat exchanger and combustion module. When the refrigerant circuit and the combustion module are heating at the same time, the indoor air undergoes double heat exchange to achieve a rapid temperature increase. The structure is simple and compact, the cost is low, and the heating effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0022] Figure 1 This is a connection diagram of the utility model dual heat source air conditioning unit;

[0023] Figure 2 This is a flow diagram of the refrigerant circuit of the utility model in the heating state;

[0024] Figure 3 This is a schematic diagram of the connection of the combustion module of the utility model;

[0025] Figure 4 This is a schematic diagram of the state when the heat recovery and exhaust pipe of the utility model is connected;

[0026] Figure 5 This is a schematic diagram of the state when the outdoor smoke exhaust pipe of the utility model is connected;

[0027] Figure 6 This is a flow diagram of the refrigerant circuit of the utility model in the cooling state;

[0028] Description of the drawings: 1. Compressor; 2. Outdoor heat exchanger; 3. Outdoor fan; 4. Indoor heat exchanger; 5. Indoor fan; 6. Burner; 7. Heat recovery exhaust duct; 8. Outdoor exhaust duct; 9. Pipeline diverter valve; 10. Four-way valve; 11. Flash tank; 12. First throttle valve; 13. Second throttle valve; 14. Gas-liquid separator; 15. Outdoor unit; 16. Indoor unit. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and feasible embodiments. It should be understood that the feasible embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figure 1 、2 As shown, the dual-heat source air-conditioning unit proposed in the utility model includes: a refrigerant circuit and a combustion module. The refrigerant circuit includes a compressor 1, an outdoor heat exchanger 2, a throttling device and an indoor heat exchanger 4 connected in sequence. The combustion module is connected to a heat recovery and exhaust pipe 7. The outlet of the heat recovery and exhaust pipe 7 is close to the outdoor heat exchanger 2. The indoor heat exchanger 4 and the combustion module can both supply heat to the indoor room.

[0031] Specifically, when the refrigerant circuit is in the heating mode, high-temperature, high-pressure gaseous refrigerant is discharged from compressor 1 and enters indoor heat exchanger 4 (acting as a condenser) to exchange heat with the indoor air. There, the gaseous refrigerant releases heat and condenses into high-pressure liquid refrigerant. The high-pressure liquid refrigerant then flows through a throttling device to reduce its pressure, becoming a low-pressure liquid refrigerant. It then enters outdoor heat exchanger 2 (acting as an evaporator) to exchange heat with the outdoor air (or other heat source). There, the liquid refrigerant absorbs heat and evaporates into a low-temperature, low-pressure gaseous refrigerant, which then flows back into compressor 1, completing the heating cycle.

[0032] The combustion module includes a burner 6, a gas pipe, a flue gas heat exchange pipe and a smoke exhaust fan. When the combustion module is turned on, the gas enters the burner 6 from the gas pipe and ignites and burns. The high-temperature flue gas generated by the combustion enters the flue gas heat exchanger to exchange heat with the indoor air. The high-temperature flue gas flows inside the pipe and the air flows outside the pipe. The indoor air absorbs the heat of the high-temperature flue gas and becomes hot air that enters the room. The flue gas after heat exchange is discharged to the outside through the exhaust pipe driven by the smoke exhaust fan.

[0033] The utility model designs a heat recovery and exhaust pipe 7, the outlet of which is close to the outdoor heat exchanger 2. When the refrigerant circuit and the combustion module are heating at the same time, the heat recovery and exhaust pipe 7 is used to discharge the high-temperature flue gas generated by combustion to the outdoor heat exchanger 2. At this time, the outdoor heat exchanger 2 is in a state of evaporation and heat absorption, and the high-temperature flue gas exchanges heat with the low-pressure liquid refrigerant in the outdoor heat exchanger 2, thereby realizing heat recovery.

[0034] In terms of heat recovery efficiency, heat exchange through outdoor heat exchanger 2 is highly efficient. This is because when the refrigerant circuit is in the heating state, the surface temperature of outdoor heat exchanger 2 is low, while the temperature of the flue gas from combustion heating is high. The temperature difference between the surface temperature of outdoor heat exchanger 2 and the flue gas temperature is large. Therefore, when the flue gas emitted from combustion heating is sent to outdoor heat exchanger 2, the vast majority of the heat is recovered by outdoor heat exchanger 2, thereby achieving efficient exhaust heat recovery and greatly improving energy utilization. Because outdoor heat exchanger 2 efficiently recovers exhaust heat from combustion heating when both heat sources are turned on simultaneously, the refrigerant circuit can also provide a stable and continuous heating supply, ensuring a comfortable indoor environment.

[0035] like Figure 1 、 3As shown, in some feasible embodiments of the present invention, the combustion module is further connected to an outdoor exhaust duct 8, the outlet of which is away from the outdoor heat exchanger 2. Since the combustion module is equipped with two exhaust ducts, the on / off status of the heat recovery exhaust duct 7 and the outdoor exhaust duct 8 can be adjusted, and the heat recovery exhaust duct 7 and / or the outdoor exhaust duct 8 can be selectively connected according to the operating conditions of the unit.

[0036] like Figure 4 、 5 As shown, the preferred solution is: heat recovery exhaust duct 7 is connected when both indoor heat exchanger 4 and combustion module are providing heat to the indoor room. Heat recovery exhaust duct 7 is used to discharge the high-temperature flue gas generated by combustion to outdoor heat exchanger 2, where the high-temperature flue gas emitted by combustion heating is efficiently recovered. Outdoor exhaust duct 8 is connected when the combustion module alone is providing heat to the indoor room, allowing the combustion module to operate reliably on its own.

[0037] For the case where the combustion module alone supplies heat to the indoor space, on the one hand, since the function of the outdoor smoke exhaust duct 8 is to directly discharge the high-temperature flue gas to the outdoors, a pipe with a shorter path can be designed. Discharging the high-temperature flue gas to the outside through the outdoor smoke exhaust duct 8 can reduce the smoke emission resistance, improve the smoke exhaust efficiency of the combustion module, and reduce the additional energy consumed to overcome the resistance. On the other hand, when the refrigerant circuit is in a shutdown state or standby state, the outdoor heat exchanger 2 and the outdoor fan 3 are not running. If the smoke is discharged through the heat recovery smoke exhaust duct 7, the dust, impurities, etc. in the high-temperature smoke are easy to accumulate on the outdoor heat exchanger, which can easily cause the outdoor heat exchanger 2 to be dirty and blocked, affecting the heat exchange efficiency.

[0038] like Figure 1 As shown, in some feasible embodiments of the present invention, the refrigerant circuit further includes a four-way valve 10. The function of the four-way valve 10 is to switch the refrigerant flow direction of the refrigerant circuit so that the indoor heat exchanger 4 can provide heating or cooling to the room.

[0039] Specifically, if Figure 2 As shown, when the refrigerant circuit is in the heating mode, high-temperature, high-pressure gaseous refrigerant is discharged from compressor 1, flows through four-way valve 10, and then enters indoor heat exchanger 4 (acting as a condenser) to exchange heat with the indoor air. The gaseous refrigerant releases heat in indoor heat exchanger 4 and condenses into high-pressure liquid refrigerant. Subsequently, the high-pressure liquid refrigerant flows through the throttling device to throttle and reduce the pressure, becoming low-pressure liquid refrigerant. It then enters outdoor heat exchanger 2 (acting as an evaporator) to exchange heat with the outdoor air (or other heat source). The liquid refrigerant absorbs heat in outdoor heat exchanger 2 and evaporates into low-temperature, low-pressure gaseous refrigerant, which then flows through four-way valve 10 and returns to compressor 1, completing the heating cycle.

[0040] like Figure 6As shown, when the refrigerant circuit is in the cooling state, high-temperature, high-pressure gaseous refrigerant is discharged from compressor 1, flows through four-way valve 10, and then enters outdoor heat exchanger 2 (acting as a condenser) to exchange heat with the indoor air. The gaseous refrigerant releases heat in outdoor heat exchanger 2 and condenses into high-pressure liquid refrigerant. Subsequently, the high-pressure liquid refrigerant flows through the throttling device to throttle and reduce its pressure, becoming low-pressure liquid refrigerant. It then enters indoor heat exchanger 4 (acting as an evaporator) to exchange heat with the indoor air. The liquid refrigerant absorbs heat in indoor heat exchanger 4 and evaporates into low-temperature, low-pressure gaseous refrigerant. It then flows through four-way valve 10 and finally returns to compressor 1, completing the refrigeration cycle.

[0041] Based on the combustion module's design with heat recovery exhaust duct 7 and outdoor exhaust duct 8, when the indoor heat exchanger 4 is solely providing heating or cooling to the room, since the combustion module is not operating, there is no high-temperature flue gas in the exhaust duct, which does not affect the outdoor heat exchanger 2. There are no restrictions on the on / off states of the heat recovery exhaust duct 7 and the outdoor exhaust duct 8, and they can be connected or closed. For example, when the indoor heat exchanger 4 is solely providing heating or cooling to the room, the outdoor exhaust duct 8 can be connected and the heat recovery exhaust duct 7 can be closed.

[0042] It should be noted that the on-off state of the heat recovery exhaust pipe 7 and the outdoor exhaust pipe 8 can be controlled by valves. Figures 3 to 5 As shown, in the preferred embodiment, the heat recovery exhaust pipe 7 and the outdoor exhaust pipe 8 are connected to the combustion module through a pipe diverter valve 9, and the pipe diverter valve 9 is used to switch the connection between the heat recovery exhaust pipe 7 and the outdoor exhaust pipe 8. That is, when the pipe diverter valve 9 connects the combustion module and the heat recovery exhaust pipe 7, the outdoor exhaust pipe 8 is in a closed state, and when the pipe diverter valve 9 connects the combustion module and the outdoor exhaust pipe 8, the heat recovery exhaust pipe 7 is in a closed state. The pipe diverter valve 9 is designed to be able to quickly switch the connection between the heat recovery exhaust pipe 7 and the outdoor exhaust pipe 8. The ability to switch instantly allows the exhaust pipe of the combustion module to be flexibly adjusted according to actual needs, and the pipe is simple, has few components, and is easy to install.

[0043] like Figure 1 As shown, in some feasible embodiments of the present invention, the dual-heat source air-conditioning unit also includes: an indoor fan 5, the indoor heat exchanger 4 and the combustion module share the indoor fan 5, the indoor fan 5 and the indoor heat exchanger 4 and the flue gas heat exchanger of the combustion module are in the same air duct, and when the indoor fan 5 is working, it drives the indoor air to flow through the indoor heat exchanger 4 and the combustion module. When the refrigerant circuit and the combustion module are heating at the same time, the indoor air undergoes double heat exchange to achieve a rapid temperature increase, with a simple and compact structure, low cost and good heating effect.

[0044] like Figure 1As shown, the dual-heat source air-conditioning unit also includes: an outdoor fan 3, which is used to drive the outdoor air to flow through the outdoor heat exchanger 2. The outlet of the heat recovery exhaust pipe 7 is located on the air inlet side of the outdoor heat exchanger 2. When the refrigerant circuit and the combustion module are heating at the same time, the high-temperature flue gas is sent out from the air inlet side of the outdoor heat exchanger 2, and passes through the outdoor heat exchanger 2 under the drive of the outdoor fan 3. The heat is fully absorbed by the outdoor heat exchanger 2, reducing energy waste and improving heat recovery efficiency.

[0045] like Figure 1 As shown, in some feasible embodiments of the present invention, the dual-heat-source air-conditioning unit further includes: a flash tank 11, which is connected in series between the outdoor heat exchanger 2 and the indoor heat exchanger 4, and the air outlet of the flash tank 11 is connected to the air supply port of the compressor 1. The flash tank 11 can utilize the residual pressure and residual heat of the refrigerant to produce steam or gas through reduced pressure flash evaporation. This steam or gas is then fed into the air supply port of the compressor 1, which can improve the working conditions of the compressor 1, such as reducing the compression ratio and compression work, thereby extending the service life of the compressor 1 and improving its operating stability. In addition, when the load changes, the flash tank 11 can quickly provide additional steam or gas to help the unit quickly respond and meet the load demand.

[0046] Based on the flash tank 11 designed between the outdoor heat exchanger 2 and the indoor heat exchanger 4, the throttling device includes a first throttle valve 12 and a second throttle valve 13. The first throttle valve 12 is connected in series between the flash tank 11 and the outdoor heat exchanger 2, and the second throttle valve 13 is connected in series between the flash tank 11 and the indoor heat exchanger 4. The main purpose of installing the throttle valve at the liquid inlet of the flash tank 11 is to reduce the pressure of the liquid entering the flash tank 11, making it easier for the liquid to flash evaporate within the flash tank 11. That is, the liquid vaporizes rapidly when the pressure is reduced, which helps to improve the flash evaporation efficiency and control the flow rate of liquid entering the flash tank 11. The main purpose of installing the throttle valve at the liquid outlet of the flash tank 11 is to control the flow rate and pressure of the liquid or gas-liquid mixture flowing out of the flash tank 11, helping to maintain stable operation of the unit and prevent damage to subsequent equipment due to excessive flow or excessive pressure.

[0047] It should be understood that since the refrigerant flow direction of the refrigerant circuit is different in the heating state and the cooling state, when the refrigerant circuit is in the heating state, the first throttle valve 12 is located at the liquid outlet of the flash tank 11, and the second throttle valve 13 is located at the liquid inlet of the flash tank 11; when the refrigerant circuit is in the cooling state, the first throttle valve 12 is located at the liquid inlet of the flash tank 11, and the second throttle valve 13 is located at the liquid outlet of the flash tank 11.

[0048] like Figure 1As shown, in some embodiments of the present invention, the compressor 1, outdoor heat exchanger 2, and throttling device are installed in the outdoor unit 15, while the indoor heat exchanger 4 and combustion module are installed in the indoor unit 16. The outdoor heat exchanger 2 is installed in the outdoor unit 15 to fully utilize the energy of the outdoor natural wind, improving the operating performance of the air conditioning unit and reducing energy consumption. The indoor heat exchanger 4 is responsible for transferring heat to the indoor room or absorbing heat from the indoor room, working together with the combustion module to achieve the heating function. Installing these two components in the indoor unit 16 ensures the efficiency and accuracy of heat transfer, thereby improving the user experience.

[0049] It should be understood that the dual-heat source air-conditioning unit is a dual-heat source heat pump unit. The dual-heat source heat pump unit can simultaneously utilize the indoor heat exchanger 4 and the burner 6. The two work together to quickly increase the indoor temperature in a short time and improve the energy efficiency of the unit.

[0050] For ease of understanding, some application examples of the present invention are used to illustrate in detail.

[0051] The pipeline diverter valve 9 is controlled by the controller of the unit. After the unit is started, the controller detects the operating mode of the unit.

[0052] If it is detected that the operating mode of the unit is cooling mode, the controller transmits a first signal to the pipeline steering valve 9. After receiving the first signal, the pipeline steering valve 9 turns to the heat recovery exhaust pipe 7. At this time, the outdoor exhaust pipe 8 is connected and the heat recovery exhaust pipe 7 is closed.

[0053] If it is detected that the operating mode of the unit is heating mode, the heat source continues to be detected. If the indoor heat exchanger 4 is providing heat alone or the combustion module is providing heat alone, the controller transmits a first signal to the pipe steering valve 9. After the pipe steering valve 9 receives the first signal, the pipe steering valve 9 turns to the heat recovery smoke exhaust pipe 7. At this time, the outdoor smoke exhaust pipe 8 is in the connected state and the heat recovery smoke exhaust pipe 7 is in the closed state. If the indoor heat exchanger 4 and the combustion module are providing heat at the same time, the controller transmits a second signal to the pipe steering valve 20. After the pipe steering valve 20 receives the second signal, the pipe steering valve 9 turns to the outdoor smoke exhaust pipe 8. At this time, the heat recovery smoke exhaust pipe 7 is in the connected state and the outdoor smoke exhaust pipe 8 is in the closed state.

[0054] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. The order of execution of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and as long as the output of the previous processing is not used in the subsequent processing. Similar sequential terms used for the convenience of description do not mean that they must be implemented in such an order.

[0055] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus 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 limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Dual heat source air conditioning unit, including: A refrigerant circuit and a combustion module, wherein the refrigerant circuit comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence, and is characterized in that the combustion module is connected to a heat recovery exhaust pipe, the outlet of the heat recovery exhaust pipe is close to the outdoor heat exchanger, and the indoor heat exchanger and the combustion module can both supply heat to the indoor room.

2. The dual heat source air conditioning unit according to claim 1, characterized in that: The combustion module is also connected to an outdoor smoke exhaust pipe, the outlet of the outdoor smoke exhaust pipe is far away from the outdoor heat exchanger, and the on-off state of the heat recovery smoke exhaust pipe and the outdoor smoke exhaust pipe is adjustable; The heat recovery smoke exhaust pipe is connected when both the indoor heat exchanger and the combustion module supply heat to the indoor room, and the outdoor smoke exhaust pipe is connected when the combustion module alone supplies heat to the indoor room.

3. The dual heat source air conditioning unit according to claim 2, characterized in that: The heat recovery smoke exhaust pipe and the outdoor smoke exhaust pipe are connected to the combustion module via a pipe diverter valve, and the pipe diverter valve is used to switch between the heat recovery smoke exhaust pipe and the outdoor smoke exhaust pipe.

4. The dual heat source air conditioning unit according to claim 1, characterized in that: The dual-heat source air conditioning unit further includes an indoor fan, which is located in the same air duct as the indoor heat exchanger and the flue gas heat exchanger of the combustion module to drive indoor air to flow through the indoor heat exchanger and the flue gas heat exchanger.

5. The dual heat source air conditioning unit according to claim 1, characterized in that: The dual-heat-source air-conditioning unit further includes an outdoor fan configured to drive outdoor air to flow through the outdoor heat exchanger, and an outlet of the heat recovery and exhaust duct is located on an air inlet side of the outdoor heat exchanger.

6. The dual heat source air conditioning unit according to claim 1, characterized in that: The dual-heat-source air-conditioning unit further includes: a four-way valve connected to the refrigerant circuit, wherein the four-way valve is used to switch the refrigerant flow direction of the refrigerant circuit so that the indoor heat exchanger can provide heating or cooling to the room.

7. The dual heat source air conditioning unit according to claim 1, characterized in that: The dual-heat-source air-conditioning unit further includes a flash tank connected in series between the outdoor heat exchanger and the indoor heat exchanger, and an air outlet of the flash tank is connected to an air supply port of the compressor.

8. The dual heat source air conditioning unit according to claim 7, characterized in that: The throttling device includes a first throttling valve and a second throttling valve. The first throttling valve is connected in series between the flash tank and the outdoor heat exchanger, and the second throttling valve is connected in series between the flash tank and the indoor heat exchanger.

9. The dual heat source air conditioning unit according to claim 1, characterized in that: The compressor, the outdoor heat exchanger and the throttling device are installed in an outdoor unit, and the indoor heat exchanger and the combustion module are installed in an indoor unit.

10. The dual heat source air conditioning unit according to any one of claims 1 to 9, characterized in that: The dual-heat source air conditioning unit is a dual-heat source heat pump unit.

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