Smoke exhaust heat exchanger and heat exchange system

Abstract

The utility model provides a smoke exhaust heat exchanger and a heat exchange system, the smoke exhaust heat exchanger comprises a shell, heat exchange fins and a ventilation pipeline, the shell is provided with a smoke inlet, a smoke outlet, an air inlet and an air outlet, the smoke inlet and the smoke outlet are relatively far away from each other, the smoke inlet is suitable for being communicated with a range hood, and the smoke outlet is suitable for being communicated with a smoke exhaust well. The air inlet is suitable for communicating with the outdoor environment, and the air outlet is suitable for being connected indoors. The multiple rows of heat exchange pieces are assembled in the shell, the tail end heat exchange piece close to the air inlet divides the shell into a smoke circulation area and an air inlet and exhaust area, and the multiple rows of heat exchange pieces divide the smoke circulation area into smoke flow channels. The ventilation pipeline penetrates through the heat exchange pieces, the inlet end of the ventilation pipeline is suitable for communicating with the air inlet, and the outlet end communicates with the air outlet. By means of the smoke exhaust heat exchanger, smoke is exhausted in a concentrated mode, smoke diffusion is avoided, outdoor fresh air can be heated by means of smoke heat in winter, sudden temperature drop caused by direct blowing of cold air is avoided, and the comfort level of the indoor environment is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchangers, specifically relating to a flue gas heat exchanger and a heat exchange system. Background Technology

[0002] Currently, most kitchen range hoods on the market focus on improving performance indicators such as exhaust volume and static pressure. However, running a high-volume range hood for a long time in a limited space can exacerbate the indoor negative pressure effect, leading to a series of usage problems, including difficulty in opening and closing doors and windows due to excessive pressure difference, frequent backflow of odors from drainage pipes, reduced smoke extraction efficiency, and a significant increase in wind noise from gaps.

[0003] However, existing air supply methods have the following problems: opening doors for air supply can easily cause oil fumes to spread and pollute other spaces. Opening windows for air supply can affect the kitchen temperature. In winter, the negative pressure of exhaust air caused by opening windows leads to a rapid influx of cold outdoor air, causing a sharp drop in indoor temperature and seriously affecting the user's comfort and health. In summer, the high temperature in the kitchen work area creates a harsh working environment, and conventional heat exchange systems are difficult to adapt to the special working conditions of the kitchen: on the one hand, there is a contradiction between the kitchen's ventilation needs and the air conditioning's cooling capacity needs, and small air conditioners have insufficient cooling capacity, resulting in poor cooling effect; on the other hand, oil fume particles quickly accumulate on the surface of the air conditioner's heat exchanger, causing airflow channel blockage and a sharp decline in heat exchange efficiency, leading to operational failure. Utility Model Content

[0004] The present invention aims to provide a flue gas heat exchanger and heat exchange system to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a flue gas heat exchanger, comprising:

[0006] The housing has a smoke inlet and a smoke outlet, as well as an air inlet and an air outlet, which are relatively far apart. The smoke inlet is adapted to connect to a range hood, the smoke outlet is adapted to connect to a smoke exhaust well, the air inlet is adapted to communicate with the outdoor environment, and the air outlet is adapted to connect to the indoor environment.

[0007] Multiple rows of heat exchange fins are assembled inside the housing, wherein the end heat exchange fins near the air inlet divide the housing into a flue gas flow area and an air inlet and exhaust area, and the multiple rows of heat exchange fins further divide the flue gas flow area into flue gas channels; and

[0008] A ventilation duct runs through the heat exchange fins, with its inlet end connected to the air inlet and its outlet end connected to the air outlet.

[0009] When heat exchange is required, fresh air flows through the ventilation duct and exchanges heat with the exhaust gas from the range hood through the heat exchange fins. The heat-exchanged air then enters the room.

[0010] In this embodiment, the exhaust heat exchanger provided in this application is used to centrally exhaust the flue gas, avoid the spread of oil fumes, and in winter, the heat from the flue gas can be used to heat the outdoor fresh air, avoiding the sudden drop in temperature caused by direct cold air blowing, thus ensuring the comfort of the indoor environment.

[0011] In one embodiment, an air intake reversing module is further assembled within the housing, the air intake reversing module comprising:

[0012] The first partition, assembled between the end heat exchange fins and the shell, divides the air inlet and exhaust zones into an air inlet channel and an air exhaust channel.

[0013] An exhaust valve, mounted on the first partition, is used to control the connection and disconnection with the exhaust duct; and

[0014] The second partition and the air inlet valve are provided. The second partition is disposed at the inlet end of the ventilation duct, and the air inlet valve is assembled on the second partition. The air inlet valve is used to control the opening and closing of the air inlet channel.

[0015] When the outside temperature is lower than the predetermined temperature, the air inlet valve opens and the air outlet valve closes. Outside air exchanges heat with the heat exchange fins through the ventilation duct and then connects to the indoor environment through the exhaust duct.

[0016] When the outside temperature is higher than the predetermined temperature, the air inlet valve closes and the air outlet valve opens, allowing outside air to directly connect with the indoor environment through the air outlet valve and the air outlet duct.

[0017] In this embodiment, the flue gas and fresh air flow can be separated in summer by the air intake reversing module. The exhaust heat exchanger can supply air to the air conditioner, forming a heat exchange system suitable for kitchen use. This meets the cooling requirements of the high-temperature work area in the kitchen, avoids the deposition of oil fume particles in the air conditioner and the blockage of the airflow channel, and ensures the heat exchange efficiency of the heat exchange system.

[0018] In one embodiment, the air intake reversing module further includes an automatic reversing drive component, the automatic reversing drive component comprising:

[0019] The first transmission rod assembly is mounted on the exhaust valve and is used to control the opening and closing of the exhaust valve. The first transmission rod assembly includes a first drive rod that is rigidly connected to the fan blade shaft of the exhaust valve, and a first transmission rod that is rotatably connected to each of the first drive rods.

[0020] The second transmission rod assembly is mounted on the air inlet valve and is used to control the opening and closing of the air inlet valve; the second transmission rod assembly includes a second drive rod rigidly connected to the fan blade shaft of the air inlet valve, and a second transmission rod rotatably connected to each of the second drive rods;

[0021] A temperature-sensing drive assembly includes a temperature-sensing actuator and a V-shaped transmission component. The temperature-sensing actuator has a telescopic rod based on temperature changes. The symmetrical portion of the V-shaped transmission component is connected to the telescopic rod via a swing arm. The two ends of the V-shaped transmission component are respectively connected to a first transmission rod and a second transmission rod.

[0022] A return spring is connected between the second transmission rod and the air inlet valve, and the return spring is adapted to apply a pulling force away from the V-shaped transmission member to the second transmission rod;

[0023] The swing arm, under the thrust of the telescopic rod, drives the V-shaped transmission component to rotate, thereby causing the exhaust valve and the intake valve to open or close selectively.

[0024] In one embodiment, the swing arm and the V-shaped transmission member are connected via a wind valve drive shaft, and the swing arm is hinged to the telescopic rod.

[0025] In one embodiment, multiple rows of heat exchange fins are arranged in parallel and spaced apart, and flue gas flows through the spaces between the heat exchange fins.

[0026] The staggered heat exchange fins form an S-shaped flue gas baffle channel between the flue gas inlet and the flue gas outlet.

[0027] In this embodiment, the flue gas flow area is divided into baffle channels by staggered heat exchange fins, which can extend the flue gas flow path, thereby extending the heat exchange time between fresh air and flue gas and enhancing the heat exchange effect.

[0028] In one embodiment, the end heat exchange fins, located away from the air inlet, divide the housing into a flue gas circulation zone and an air guide channel.

[0029] The ventilation duct includes two sets of core tubes arranged in parallel. One set of the core tubes passes through the heat exchange fins and is adapted to communicate with the air inlet and the air guide channel. The other set of the core tubes is adapted to communicate with the air outlet and the air guide channel.

[0030] During heat exchange, fresh air enters from one set of the core tube groups through the air guide channel into another set of the core tube groups.

[0031] In one embodiment, the ventilation duct includes a core tube group consisting of multiple U-shaped core tubes, with the straight section of the core tube group passing through multiple rows of heat exchange fins.

[0032] In one embodiment, an oil filter screen is installed on the flue gas inlet;

[0033] A fresh air filter is installed on the air inlet.

[0034] In one embodiment, the housing includes a hood and a back panel, the back panel being detachably mounted on the hood.

[0035] On the other hand, this utility model provides a heat exchange system, including:

[0036] The flue gas heat exchanger;

[0037] The air conditioner is connected to the air outlet of the exhaust heat exchanger via a duct, and the air supply outlet of the air conditioner is connected to the indoor air outlet. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the external structure of the flue gas heat exchanger of this utility model;

[0039] Figure 2 This is a schematic diagram of the internal structure of the flue gas heat exchanger of this utility model;

[0040] Figure 3 This is a schematic diagram of the air intake reversing module of this utility model;

[0041] Figure 4 This is a schematic diagram of the assembly of heat exchange fins and ventilation ducts in one embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the assembly of the heat exchange fins and ventilation ducts in another embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the heat exchange system in one embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the heat exchange system in another embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 01-Machine cover; 011-Smoke outlet; 012-Smoke inlet;

[0047] 02-Back panel;

[0048] 03-Fresh air filter;

[0049] 04-Inlet air reversing module; 041-Inlet air valve; 042-Second transmission rod; 043-Second drive rod; 044-V-shaped transmission component; 045-Temperature sensor actuator; 046-First drive rod; 047-First transmission rod; 048-Exhaust air

[0050] Valve; 049 - Return spring;

[0051] 05-Heat exchange fins;

[0052] 06-Ventilation ductwork;

[0053] 07-Oil Filter Screen;

[0054] 10 - Flue gas heat exchanger;

[0055] 20 - Range hood;

[0056] 30 - Smoke exhaust well;

[0057] 40 - Indoor air vent;

[0058] 50-Air conditioner. Detailed Implementation

[0059] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0060] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0061] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] Existing kitchen range hoods running at high power for extended periods can cause indoor air pressure imbalance. This negative pressure not only makes opening and closing doors and windows difficult and causes sewer odors to back up, but also reduces exhaust efficiency and generates significant wind noise. Opening doors to allow fresh air in can easily spread cooking fumes to other rooms, causing pollution. Opening windows for ventilation, on the other hand, can lead to drastic changes in indoor temperature. In winter, the negative pressure draws in a large amount of cold air, causing a rapid drop in kitchen temperature, affecting heating efficiency and potentially causing discomfort. During the hot summer months, opening windows for ventilation can create a harsh, high-temperature environment in the kitchen.

[0064] The exhaust heat exchanger provided in this application has a built-in bidirectional flow channel for exhausting smoke and making up for air. The oil fumes are discharged through the heat exchanger and will not spread to other indoor spaces. In winter, the heat of the flue gas can be used to heat the fresh air, eliminating indoor negative pressure and regulating indoor temperature. In summer, the exhaust heat exchanger can be connected to an air conditioner. Outdoor fresh air is directly introduced into the air conditioner's air outlet through the air intake reversing module to meet the air conditioner's air intake requirements. At the same time, it prevents oil fume particles from entering the air conditioner and avoids the accumulation of oil fume particles in the air conditioner, which can cause airflow channel blockage.

[0065] Please refer to the attached document as well. Figure 1 To be continued Figure 7 The present invention provides a flue gas heat exchanger. The flue gas heat exchanger 10 includes a shell, multiple rows of heat exchange fins 05, and ventilation ducts 06. The heat exchange fins 05 and ventilation ducts 06 form a flow channel for flue gas and fresh air within the shell. The ventilation ducts 06 can absorb heat from the flue gas through the heat exchange fins 05, thereby heating the fresh air. Specifically, the shell has relatively far-away flue gas inlets 012 and 011, as well as air inlets and outlets. The flue gas inlet 012 is suitable for connecting to a range hood 20, the flue gas outlet 011 is suitable for connecting to a flue gas exhaust shaft 30, the air inlet is suitable for communicating with the outdoor environment, and the air outlet is suitable for connecting to the indoor environment. Multiple rows of heat exchange fins 05 are assembled inside the shell. The end heat exchange fins 05 near the air inlet divide the shell into a flue gas flow area and an air inlet and exhaust area. The multiple rows of heat exchange fins 05 further divide the flue gas flow area into flue gas flow channels. Ventilation duct 06 runs through heat exchange fins 05. The inlet end of ventilation duct 06 is adapted to connect with the air inlet, and the outlet end is adapted to connect with the air outlet. When heat exchange is required, fresh air flows through ventilation duct 06 and exchanges heat with the exhaust gas discharged from range hood 20 through heat exchange fins 05. The heat-exchanged air then enters the room.

[0066] In one implementation, please refer to the appendix. Figure 6 The air inlet is connected to the outdoor air outlet through a duct, and the air outlet can be directly connected to the indoor air outlet 40 through a duct. The smoke inlet 012 and the smoke outlet 011 are connected to the smoke extractor and the smoke exhaust shaft 30 through ducts, respectively. When used in winter, the smoke enters the casing through the air inlet and is then discharged outdoors through the smoke exhaust shaft 30 through the air outlet. At the same time, fresh air enters the ventilation duct 06 through the air inlet, absorbs the heat of the smoke through the heat exchange fins 05, and the heated warm air is directly discharged into the room through the air outlet to increase the indoor temperature.

[0067] In this embodiment, the flue gas is discharged in a directional and centralized manner, which effectively prevents the spread and pollution of the flue gas. At the same time, the heat of the flue gas itself is used to heat the fresh air, which prevents cold air from directly entering the room and causing a sudden drop in temperature. The heated fresh air is used to maintain the indoor temperature, which not only achieves the function of supplementing air, but also significantly improves the physical comfort of the kitchen environment in winter.

[0068] In one embodiment, please refer to the appendix as well. Figure 2 and attached Figure 3 An air intake reversing module 04 is also installed inside the housing. Located between the air intake and exhaust zones, this module switches the direction of fresh air flow. In winter, fresh air enters the ventilation duct 06 via the air intake reversing module 04 to achieve heat exchange between the flue gas and fresh air. In summer, the fresh air flow direction is adjusted by the air intake reversing module 04, allowing it to be directly introduced from the air intake zone to the exhaust zone without needing to flow through the ventilation duct 06 for heat exchange. The air intake reversing module 04 includes a first partition, an exhaust valve 048, a second partition, and an air intake valve 041. The first partition is installed between the end heat exchange plate 05 and the housing, separating the air intake and exhaust zones into an air intake channel and an exhaust channel. The exhaust valve 048 is installed on the first partition to control the opening and closing of the exhaust channel. The second partition is located at the inlet end of the ventilation duct 06, and the air intake valve 041 is installed on the second partition to control the opening and closing of the air intake channel. When the outside temperature is lower than the predetermined temperature, the air inlet valve 041 opens and the air outlet valve 048 closes. Outside air exchanges heat with the heat exchange fins 05 through the ventilation duct 06 and then connects to the indoor environment through the exhaust duct. When the outside temperature is higher than the predetermined temperature, the air inlet valve 041 closes and the air outlet valve 048 opens. Outside air directly connects to the indoor environment through the exhaust valve 048 and the exhaust duct. Preferably, the predetermined temperature is 27°C.

[0069] In one implementation, please refer to the appendix. Figure 7 The air inlet is connected to the outdoor air outlet through a duct, and the air outlet is connected to the air supply outlet of the air conditioner 50 through a duct. In summer, fresh air enters the exhaust area directly from the air inlet area and is finally sent to the air conditioner 50 through the air outlet. The flue gas and fresh air flow channels are independent of each other to prevent fresh air from contacting the flue gas and carrying oil fume particles into the air conditioner 50, thus preventing the airflow channel inside the air conditioner 50 from being blocked and affecting the heat exchange efficiency.

[0070] In this embodiment, the air intake reversing module 04 enables the switching between summer and winter air supply modes, improving the versatility of the heat exchanger. During summer use, flue gas and fresh air can be transported through independent channels, and the exhaust heat exchanger 10 supplies air to the air conditioner 50 to meet the air volume requirements of the high-temperature work area in the kitchen. At the same time, it can prevent oil fumes from entering the air conditioner 50, effectively preventing the problem of channel blockage caused by oil accumulation, ensuring the long-term stable operation of the heat exchange system, and continuously meeting the cooling needs of the kitchen.

[0071] In one embodiment, please refer to the appendix. Figure 3The air intake reversing module 04 also includes an automatic reversing drive assembly, which includes a first transmission rod group 047, a second transmission rod group 042, a temperature-sensing drive assembly, and a return spring 049. The temperature-sensing drive assembly controls the opening and closing of the exhaust valve 048 and the air intake valve 041 based on temperature. The first transmission rod group 047 is mounted on the exhaust valve 048 and is used to control the opening and closing of the exhaust valve 048. The first transmission rod group 047 includes a first drive rod 046 rigidly connected to the fan blade shaft of the exhaust valve 048, and a first transmission rod 047 rotatably connected to each of the first drive rods 046. The second transmission rod group 042 is mounted on the air intake valve 041 and is used to control the opening and closing of the air intake valve 041. The second transmission rod group 042 includes a second drive rod 043 rigidly connected to the fan blade shaft of the air intake valve 041, and a second transmission rod 042 rotatably connected to each of the second drive rods 043. The temperature-sensing drive assembly includes a temperature-sensing actuator 045 and a V-shaped transmission component 044. The temperature-sensing actuator 045 has a telescopic rod based on temperature changes. The symmetrical portion of the V-shaped transmission component 044 is connected to the telescopic rod via a swing arm. The two ends of the V-shaped transmission component 044 are respectively connected to a first transmission rod 047 and a second transmission rod 042. A return spring 049 is connected between the second transmission rod 042 and the air inlet valve 041. The return spring 049 is adapted to apply a pulling force away from the V-shaped transmission component to the second transmission rod 042. Under the thrust of the telescopic rod, the swing arm drives the V-shaped transmission component 044 to rotate, thereby causing either the exhaust valve 048 or the air inlet valve 041 to open or close. When the outside fresh air temperature is lower than the predetermined temperature, the temperature-sensing actuator 045 drives the inlet valve 041 to open and the exhaust valve 048 to close through the first transmission rod group 047 and the second transmission rod group 042, so that fresh air can be introduced into the ventilation duct 06 through the air inlet; when the outside fresh air temperature is higher than the predetermined temperature, the temperature-sensing actuator 045 drives the inlet valve 041 to close and the exhaust valve 048 to open through the first transmission rod group 047 and the second transmission rod group 042, so that fresh air can flow directly through the air inlet area and be discharged from the air outlet.

[0072] In one embodiment, the rocker arm is connected to the V-shaped transmission element 044 via a wind valve drive shaft, and the rocker arm is hinged to the telescopic rod.

[0073] In one embodiment, multiple rows of heat exchange fins 05 are arranged in parallel and spaced apart, and flue gas flows through the spaces between the heat exchange fins 05. The staggered distribution of the heat exchange fins 05 forms an S-shaped flue gas deflection channel between the flue gas inlet 012 and the flue gas outlet 011.

[0074] Preferably, the flue gas flow path can be a three-section baffled flow path, in which the flue gas flows horizontally and undergoes two reversals. The baffles extend the flow path of the flue gas, thereby extending the heat exchange time and achieving sufficient heat exchange between the fresh air and the flue gas. In practical applications, the arrangement of the heat exchange fins 05 can be adjusted based on the above design concept to appropriately increase the number of baffles and reversals, further extending the heat exchange time between the flue gas and the fresh air.

[0075] In one embodiment, please refer to the appendix. Figure 4 The terminal heat exchange fins 05, located away from the air inlet, divide the casing into a flue gas circulation zone and an air guide channel. The ventilation duct 06 includes two sets of core tubes arranged in parallel. One set of core tubes passes through the heat exchange fins 05 and is adapted to communicate with the air inlet and the air guide channel; the other set of core tubes is adapted to communicate with the air outlet and the air guide channel. During heat exchange, fresh air enters the other set of core tubes through the air guide channel from one set of core tubes.

[0076] In another embodiment, please refer to the appendix. Figure 5 The ventilation duct 06 includes a core tube group consisting of multiple U-shaped core tubes, and the straight section of the core tube group runs through multiple rows of heat exchange fins 05.

[0077] In one embodiment, an oil filter screen 07 is installed on the flue gas inlet 012. The flue gas is filtered by the oil filter screen 07 to remove oil fumes. A fresh air filter 03 is installed on the air inlet to filter dust and lint in the fresh air, avoiding blockage inside the heat exchanger and ensuring heat exchange efficiency.

[0078] In one embodiment, the housing includes a shroud 01 and a back plate 02, the back plate 02 being detachably mounted on the shroud 01 to facilitate cleaning of the internal structure of the heat exchanger.

[0079] Furthermore, the oil filter screen 07 is detachably inserted into the slot at the air inlet, making it easy to pull out for regular cleaning or replacement.

[0080] On the other hand, this utility model provides a heat exchange system, including the exhaust heat exchanger 10 and air conditioner 50 described in the above embodiments. The air conditioner 50 is connected to the air outlet of the exhaust heat exchanger 10 through a duct, and the air supply outlet of the air conditioner 50 is connected to the indoor air outlet 40. In practical applications, the air outlet of the exhaust heat exchanger 10 can also be directly connected to the indoor air outlet 40.

[0081] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flue gas heat exchanger, characterized in that, include: The housing has a smoke inlet and a smoke outlet, as well as an air inlet and an air outlet, which are relatively far apart. The smoke inlet is adapted to connect to a range hood, the smoke outlet is adapted to connect to a smoke exhaust well, the air inlet is adapted to communicate with the outdoor environment, and the air outlet is adapted to connect to the indoor environment. Multiple rows of heat exchange fins are assembled inside the housing, wherein the end heat exchange fins near the air inlet divide the housing into a flue gas flow area and an air inlet and exhaust area, and the multiple rows of heat exchange fins further divide the flue gas flow area into flue gas channels; and A ventilation duct runs through the heat exchange fins, with its inlet end connected to the air inlet and its outlet end connected to the air outlet. When heat exchange is required, fresh air flows through the ventilation duct and exchanges heat with the exhaust gas from the range hood through the heat exchange fins. The heat-exchanged air then enters the room.

2. The flue gas heat exchanger as described in claim 1, characterized in that, An air intake reversing module is also assembled inside the housing, the air intake reversing module comprising: The first partition, assembled between the end heat exchange fins and the shell, divides the air inlet and exhaust zones into an air inlet channel and an air exhaust channel. An exhaust valve, mounted on the first partition, is used to control the connection and disconnection with the exhaust duct; and The second partition and the air inlet valve are provided. The second partition is disposed at the inlet end of the ventilation duct, and the air inlet valve is assembled on the second partition. The air inlet valve is used to control the opening and closing of the air inlet channel. When the outside temperature is lower than the predetermined temperature, the air inlet valve opens and the air outlet valve closes. Outside air exchanges heat with the heat exchange fins through the ventilation duct and then connects to the indoor environment through the exhaust channel. When the outside temperature is higher than the predetermined temperature, the air inlet valve closes and the air outlet valve opens, allowing outside air to directly connect with the indoor environment through the air outlet valve and the air outlet duct.

3. The flue gas heat exchanger as described in claim 2, characterized in that, The air intake reversing module further includes an automatic reversing drive component, which includes: The first transmission rod assembly is mounted on the exhaust valve and is used to control the opening and closing of the exhaust valve. The first transmission rod assembly includes a first drive rod that is rigidly connected to the fan blade shaft of the exhaust valve, and a first transmission rod that is rotatably connected to each of the first drive rods. The second transmission rod assembly is mounted on the air inlet valve and is used to control the opening and closing of the air inlet valve; the second transmission rod assembly includes a second drive rod rigidly connected to the fan blade shaft of the air inlet valve, and a second transmission rod rotatably connected to each of the second drive rods; A temperature-sensing drive assembly includes a temperature-sensing actuator and a V-shaped transmission component. The temperature-sensing actuator has a telescopic rod based on temperature changes. The symmetrical portion of the V-shaped transmission component is connected to the telescopic rod via a swing arm. The two ends of the V-shaped transmission component are respectively connected to a first transmission rod and a second transmission rod. A return spring is connected between the second transmission rod and the air inlet valve, and the return spring is adapted to apply a pulling force away from the V-shaped transmission member to the second transmission rod; The swing arm, under the thrust of the telescopic rod, drives the V-shaped transmission component to rotate, thereby causing the exhaust valve and the intake valve to open or close selectively.

4. The flue gas heat exchanger as described in claim 3, characterized in that, The swing arm and the V-shaped transmission component are connected via a wind valve drive shaft, and the swing arm is hinged to the telescopic rod.

5. The flue gas heat exchanger as described in claim 2, characterized in that, The heat exchange fins are arranged in parallel and spaced intervals, and the flue gas flows through the intervals between the heat exchange fins; The staggered heat exchange fins form an S-shaped flue gas baffle between the flue gas inlet and the flue gas outlet.

6. The flue gas heat exchanger as described in claim 1, characterized in that, The end heat exchange fins, located away from the air inlet, divide the housing into a flue gas flow zone and an air guide channel; The ventilation duct includes two sets of core tubes arranged in parallel. One set of the core tubes passes through the heat exchange fins and is adapted to communicate with the air inlet and the air guide channel. The other set of the core tubes is adapted to communicate with the air outlet and the air guide channel. During heat exchange, fresh air enters from one set of the core tube groups through the air guide channel into another set of the core tube groups.

7. The flue gas heat exchanger as described in claim 1, characterized in that, The ventilation duct includes a core tube group consisting of multiple U-shaped core tubes, with the straight section of the core tube group passing through multiple rows of heat exchange fins.

8. The flue gas heat exchanger as described in claim 1, characterized in that, An oil filter screen is installed on the flue gas inlet; A fresh air filter is installed on the air inlet.

9. The flue gas heat exchanger as described in claim 1, characterized in that, The housing includes a hood and a back panel, the back panel being detachably mounted on the hood.

10. A heat exchange system, characterized in that, include: The flue gas heat exchanger as described in any one of claims 1-9; The air conditioner is connected to the air outlet of the exhaust heat exchanger via a duct, and the air supply outlet of the air conditioner is connected to the indoor air outlet.

Images