Building discharged heat energy recovery device

Abstract

The utility model relates to a building discharged heat energy recovery device which comprises a flow guide air pipe communicated with a heat dissipation flow channel of building discharged heat transfer airflow. Thermal power generation assemblies capable of generating power by using continuously flowing heat transfer airflow to form differential temperature fields and heat energy by actively transferring heat in the heat transfer airflow flowing through the thermal power generation assemblies are arranged on the pipe wall of the flow guide air pipe at intervals in the flowing direction of the heat transfer airflow conveyed in the flow guide air pipe. A preheating water pipe is further arranged on the side, away from the flow guide air pipe, of the thermal power generation assembly and the side, away from the flow guide air pipe, of the heat exchange assembly, and the two ends of the preheating water pipe are connected with a first building water tank and a second building water tank correspondingly. According to the device, heat energy can be converted into electric energy through thermoelectric power generation, meanwhile, heat energy can be recycled in an active heat transfer mode, bathing water to be used is preheated through the recycled heat energy, and therefore the recycling effect of discharged heat energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery equipment, in particular to a building exhaust heat recovery device. Background Art

[0002] With the further development of intelligence and electrification, the usage and power of electrical equipment inside buildings are gradually increasing. For example, in order to ensure the safety inside the building, it is usually necessary to build a monitoring network, which makes the safe operation of the central control room particularly important. Since there are a large number of electronic equipment and processors in the central control room to centrally manage and monitor the air conditioning, fresh air, ventilation, water supply and drainage, and power systems in the building, in order to meet the user's strict requirements for environmental conditions such as temperature, humidity, and ventilation in the building, create a comfortable building environment, and achieve both service and energy. The heat in the space will rise sharply, causing the working environment temperature of some electrical equipment to rise, which is very easy to cause overheating, short circuits, and spontaneous combustion. Therefore, in order to ensure the stability of the working environment, it is usually necessary to set up an independent heat dissipation channel to continuously discharge the working heat to achieve effective heat dissipation.

[0003] However, the existing building electrification system does not involve the recovery and processing of exhaust heat energy, resulting in the inability to effectively recover and reuse the heat energy discharged from the building, causing a waste of resources. In addition, the exhaust heat energy mainly exists in the form of hot air flow. The heat entrained by the air flow cannot be directly and effectively used for water heating due to the fluidity of the air flow. Therefore, there is a need for a device that can efficiently recover the heat entrained by the exhaust heat transfer air flow and reuse the recovered heat. Utility Model Content

[0004] The utility model aims to provide a building exhaust heat energy recovery device which can convert thermal energy into electrical energy by temperature difference power generation, recover thermal energy by active heat transfer and use the recovered thermal energy to preheat bathing water to be used, thereby improving the recovery and utilization effect of exhaust heat energy, so as to solve the problem that the existing building electrification system only has a heat dissipation structure, so that the heat transfer airflow used for heat dissipation is directly discharged to the outside and the heat carried by the heat transfer airflow cannot be recovered, resulting in resource waste and low heat circulation utilization rate.

[0005] The technical solution adopted by the utility model is: a building exhaust heat energy recovery device, including a guide air duct that can be connected to the heat dissipation channel of the building exhaust heat transfer airflow, and on the pipe wall of the guide air duct along the flow direction of the heat transfer airflow transported therein, there are arranged at intervals a thermal power generation component that can use the continuously flowing heat transfer airflow to form a differential temperature field to generate electricity and a heat exchange component that can actively transfer the heat in the heat transfer airflow flowing through the thermal power generation component to recover the heat energy for a second time, and the thermal power generation component and the heat exchange component are further provided with a preheating water pipe on the side away from the guide air duct, and the two ends of the preheating water pipe are respectively connected to a first building water tank and a second building water tank.

[0006] According to a preferred embodiment, the air guide duct includes an inlet pipe port, an outlet pipe port, a first flat tube and a second flat tube, wherein the output end of the inlet pipe port is connected to the first flat tube, the side of the first flat tube away from the inlet pipe port is connected to the second flat tube, and the side of the second flat tube away from the first flat tube is connected to the outlet pipe port for discharging heat transfer airflow; the thermal power generation component and the heat exchange component are respectively installed on the tube walls of the first flat tube and the second flat tube.

[0007] According to a preferred embodiment, the thermal power generation component includes a temperature difference power generation chip capable of converting electrical energy using temperature difference and an embedded frame, wherein the temperature difference power generation chip is detachably installed in two parallel embedded frames, and the two embedded frames are respectively embedded in the first flat tube and the preheated water pipe which are parallel to each other, so that the two surfaces of the temperature difference power generation chip are respectively placed in the tube cavities of the first flat tube and the preheated water pipe.

[0008] According to a preferred embodiment, a scraping mechanism is also provided on the embedded frame, which can clean the surface of the temperature difference power generation chip placed in the first flat tube to ensure the heat conduction efficiency; the surface of the temperature difference power generation chip placed in the preheating water pipe is also covered with a heat-conductive waterproof film layer.

[0009] According to a preferred embodiment, sealing gaskets are further provided on the opposite surfaces of the two parallel embedded frames, and penetrating positioning holes are opened on the frame surfaces of the two embedded frames.

[0010] According to a preferred embodiment, the guide groove of the scraping mechanism is embedded in the frame surface of the embedded frame facing the tube cavity of the first flat tube, a rotating screw is rotatably inserted in the guide groove, and a translation block whose movement direction is limited by the groove cavity of the guide groove is sleeved on the rotating screw, and a scraper strip abutting against the surface of the temperature difference power generation chip is provided on the surface of the translation block away from the guide groove; and a forward and reverse driving motor capable of driving the rotating screw to rotate is also installed at the end of the guide groove.

[0011] According to a preferred embodiment, the heat exchange component includes a first heat-conducting half shell sealed and embedded in the side tube wall of the first flat tube, a second heat-conducting half shell sealed and embedded in the side tube wall of the preheating water pipe, and a semiconductor heat exchange plate accommodated in a shell cavity constructed by splicing the first heat-conducting half shell and the second heat-conducting half shell.

[0012] According to a preferred embodiment, a first through groove for embedding the thermal power generation component is formed on the side tube wall of the first flat tube, and first positioning screws are arranged at intervals around the first through groove.

[0013] According to a preferred embodiment, a second through groove for embedding the thermal power generation component is formed on the side tube wall of the preheating water pipe facing the first flat tube, and second positioning screws are arranged at intervals around the second through groove.

[0014] According to a preferred embodiment, a driving liquid pump and a one-way check valve for driving the directional flow of bathing water are also provided in the preheated water pipe.

[0015] The beneficial effects of the utility model are:

[0016] The thermal power generation component provided in the present application can use the bathing water of the preheated water pipe to maintain the low temperature state of its low temperature surface while using the heat carried by the heat transfer airflow to increase the temperature of its high temperature surface, thereby forming a temperature difference to convert thermal energy into electrical energy, and then the electrical energy can be used to drive the heat exchange component to perform directional heat transfer work, thereby effectively and actively transferring the heat in the heat transfer airflow to the bathing water in the preheated water pipe, reducing the energy required to be provided by the external driving power supply, realizing the internal circulation of energy to a certain extent, and realizing the effective and sufficient recovery of thermal energy, greatly reducing the waste of thermal energy caused by the external heat transfer airflow, and greatly improving the utilization rate of resources. The heat exchange component provided in the present application can efficiently transfer heat in a directional active heat absorption and directional active heat release manner when powered on, so that it can fully absorb and transfer the heat carried by the heat transfer airflow to achieve efficient heat recovery. The preheating water pipe provided in the present application can synchronously and adjustably control the transportation of bathing water in the first building water tank to the second building water tank, and during the transportation process, after using low-temperature bathing water to assist in power generation, the low-temperature bathing water will also be effectively preheated, thereby increasing the temperature of the bathing water, so that when the bathing water is output at the terminal, the bathing water can be heated to a usable temperature state without wasting too much energy, greatly reducing the subsequent energy consumption, and improving the feasibility and practicability of heat recovery and recycling. The present application can efficiently recover the heat energy discharged from the building while reducing the energy consumed in the recovery process, and use the recovered heat energy to reduce the additional heating energy consumed by the related water body transportation system, greatly improving the heat cycle utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a preferred building exhaust heat recovery device proposed by the utility model;

[0018] Figure 2 It is a structural schematic diagram of the A area of ​​a preferred building exhaust heat recovery device proposed by the utility model;

[0019] Figure 3 It is a schematic plan view of a heat exchange component of a preferred building exhaust heat energy recovery device proposed by the utility model.

[0020] Reference numerals list

[0021] 1: air guide duct; 2: thermal power generation component; 3: heat exchange component; 4: preheating water pipe; 5: first building water tank; 6: second building water tank; 11: inlet pipe opening; 12: outlet pipe opening; 13: first flat tube; 14: second flat tube; 21: temperature difference power generation chip; 22: embedded frame; 23: scraping mechanism; 24: thermal conductive waterproof membrane layer; 31: first thermal conductive half shell; 32: second thermal conductive half shell; 33: semiconductor heat exchange plate; 41: second through groove; 42: second positioning screw; 43: driving liquid pump; 44: one-way check valve; 131: first through groove; 132: first positioning screw; 221: sealing gasket; 222: through positioning hole; 231: guide groove; 232: rotating screw; 233: translation block; 234: scraper; 235: forward and reverse driving motor. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be briefly introduced below in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] The technical solution provided by the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In some examples, some implementation methods are not described or are not described in detail because they belong to existing or conventional technologies.

[0024] In addition, the technical features recorded in this article, or the steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or operation sequence of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain order unless it is explicitly stated that a certain order is required.

[0025] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, under reasonable circumstances (not constituting a self-contradiction), include direct and indirect connections (couplings).

[0026] The following is a detailed description with reference to the accompanying drawings.

[0027] Example 1

[0028] The present application provides a building exhaust heat recovery device, which includes a guide air duct 1, a thermal power generation component 2, a heat exchange component 3, a preheating water pipe 4, a first building water tank 5 and a second building water tank 6.

[0029] according to Figure 1-3 In a specific embodiment shown, the guide air duct 1 can be connected to the heat dissipation channel of the heat transfer airflow discharged from the building to directionally discharge the heat dissipation airflow output by the machine room, central ventilation and air conditioning and other high-heating equipment in the building. On the wall of the guide air duct 1, along the flow direction of the heat transfer airflow transported inside, there are arranged at intervals a thermal power generation component 2 that can use the continuously flowing heat transfer airflow to form a differential temperature field to generate electricity and a heat exchange component 3 that can actively transfer the heat in the heat transfer airflow flowing through the thermal power generation component 2 and recover the heat energy for a second time. A preheating water pipe 4 is also arranged on the side of the thermal power generation component 2 and the heat exchange component 3 away from the guide air duct 1. The two ends of the preheating water pipe 4 are respectively connected to the first building water tank 5 and the second building water tank 6, so that the preheating water pipe 4 can continuously preheat the bathing water stored in the first building water tank 5, and transfer the preheated warm bathing water to the second building water tank 6 to facilitate subsequent use and continuous output. The thermal power generation component 2 provided in the present application can use the bathing water of the preheating water pipe 4 to maintain the low temperature state of its low temperature surface while using the heat carried by the heat transfer airflow to increase the temperature of its high temperature surface, thereby forming a temperature difference, so as to convert thermal energy into electrical energy, and then the electrical energy can be used to drive the heat exchange component 3 to perform directional heat transfer work, and then the heat in the heat transfer airflow is effectively and actively transferred to the bathing water in the preheating water pipe 4, reducing the energy required to be provided by the external driving power supply, realizing the internal circulation of energy to a certain extent, and realizing the effective and sufficient recovery of thermal energy, greatly reducing the waste of thermal energy caused by the external heat transfer airflow, and greatly improving the utilization rate of resources. The heat exchange component 3 provided in the present application can efficiently transfer heat in a directional active heat absorption and directional active heat release manner when powered on, so as to fully absorb and transfer the heat carried by the heat transfer airflow to achieve efficient heat recovery. The preheating water pipe 4 provided in the present application can synchronously and adjustably control the bathing water in the first building water tank 5 to be transported to the second building water tank 6, and during the transportation process, after using the low-temperature bathing water to assist in power generation, the low-temperature bathing water will also be effectively preheated, thereby increasing the temperature of the bathing water, so that when the bathing water is output at the terminal, the bathing water can be heated to a usable temperature state without wasting too much energy, greatly reducing the subsequent energy consumption, and improving the feasibility and practicability of heat recovery and recycling. The present application can efficiently recover the heat energy discharged from the building while reducing the energy consumed in the recovery process, and use the recovered heat energy to reduce the additional heating energy consumed by the related water body transportation system, greatly improving the heat cycle utilization rate.

[0030] Preferably, the air guide duct 1 includes an inlet pipe port 11, an outlet pipe port 12, a first flat tube 13 and a second flat tube 14. Preferably, the output end of the inlet pipe port 11 is connected to the first flat tube 13. Preferably, the side of the first flat tube 13 away from the inlet pipe port 11 is connected to the second flat tube 14. Further preferably, the side of the second flat tube 14 away from the first flat tube 13 is connected to the outlet pipe port 12 of the external heat transfer airflow. Preferably, the thermal power generation component 2 and the heat exchange component 3 are respectively installed on the tube walls of the first flat tube 13 and the second flat tube 14. Further preferably, a first through groove 131 for embedding the thermal power generation component 2 is opened on the side tube wall of the first flat tube 13, and first positioning screws 132 are arranged at intervals around the first through groove 131. The first flat tube 13 and the second flat tube 14 provided in the present application can increase the contact area between the thermal power generation component 2 and the heat exchange component 3 and the heat transfer airflow transported in the tube cavity by constructing an elliptical cross-section, so that the heat energy is effectively conducted to increase the temperature of the high-temperature surface of the thermal power generation component 2, and then the heat transfer airflow is again efficiently and fully transferred by the heat exchange component 3 through active heat absorption, so as to effectively recover the heat carried by the heat transfer airflow, thereby improving the recovery efficiency and recovery rate.

[0031] Preferably, the thermal power generation component 2 includes a temperature difference power generation chip 21 that can convert electric energy by using temperature difference, and an embedded frame 22 that limits the installation position. Preferably, the temperature difference power generation chip 21 is detachably installed in two parallel embedded frames 22. Specifically, the two embedded frames 22 are respectively embedded in the mutually parallel first flat tube 13 and preheated water pipe 4, so that the two surfaces of the temperature difference power generation chip 21 are respectively placed in the tube cavity of the first flat tube 13 and the preheated water pipe 4, so that the two opposite surfaces of the temperature difference power generation chip 21 respectively exchange heat with the heat transfer airflow and the bathing water to generate a temperature difference between the two surfaces, and then the temperature difference power generation chip 21 converts heat energy into electric energy by using the temperature difference effect. Preferably, a scraping mechanism 23 that can clean the surface of the temperature difference power generation chip 21 placed in the first flat tube 13 to ensure the heat conduction efficiency is also provided on the embedded frame 22. Preferably, the surface of the temperature difference power generation chip 21 placed in the preheated water pipe 4 is also coated with a heat conductive waterproof film layer 24. The temperature difference power generation chip 21 used in this application is based on the existing temperature difference power generation technology. Temperature difference power generation technology is a new energy technology that converts thermal energy into electrical energy by using the temperature difference between high and low temperature heat sources. Temperature difference power generation chip (TEG), also known as temperature difference power generation battery. When there is a temperature difference between the two surfaces of the temperature difference power generation chip, the p and n type semiconductor electric dipole arms simultaneously drive the movement of holes and electrons, and a potential difference will be generated at the output end. If a closed loop is formed, a continuous current can be achieved to supply low-power electricity and lighting. Preferably, the temperature difference power generation chip 21 provided in this application forms a closed loop with the semiconductor heat exchange plate 33, so as to use the electric energy generated by it to reduce the working energy consumption of the semiconductor heat exchange plate 33. Further preferably, the temperature difference power generation chip 21 is also externally connected to a reciprocating rechargeable battery to facilitate charging of the external power supply. In addition, the temperature difference power generation chip 21 can also be connected to independent, low-energy consumption circuit elements in buildings such as fire channel warning lights to effectively provide electrical energy. The embedded frame 22 provided in the present application can encapsulate the temperature difference power generation chip 21 on the side tube wall of the parallel first flat tube 13 and the preheating water pipe 4, so that the temperature difference power generation chip 21 can use the heat transfer airflow in the first flat tube 13 to increase the temperature of the high-temperature surface while using the low-temperature water in the preheating water pipe 4 to maintain the temperature of its low-temperature surface, thereby ensuring that a significant and stable temperature difference is formed between the two surfaces of the temperature difference power generation chip 21, so as to utilize the existence of the temperature difference to convert thermal energy into electrical energy. The scraping mechanism 23 provided in the present application can intermittently and controllably clean the surface of the temperature difference power generation chip 21 in contact with the heat transfer airflow regularly, thereby effectively removing dust and other impurities carried by the heat transfer airflow, and preventing dust from covering the surface of the temperature difference power generation chip 21 and affecting its thermal conduction and heating. The heat-conducting waterproof film layer 24 provided in the present application can prevent the surface of the temperature difference power generation chip 21 in the preheating water pipe 4 from being flooded, thereby ensuring the integrity of its internal structure.

[0032] Preferably, the opposite surfaces of the two parallel embedded frames 22 are also provided with sealing gaskets 221. Further preferably, through positioning holes 222 are opened on the frame surfaces of the two embedded frames 22. Specifically, the through positioning hole 222 of the embedded frame 22 installed on the first flat tube 12 can be sleeved onto the first positioning screw 132, so that the embedding position of the embedded frame 22 is defined by the nut matching the first positioning screw 132. Preferably, the through positioning hole 222 of the embedded frame 22 installed on the preheating water pipe 4 can be sleeved onto the second positioning screw 41, so that the embedding position of the embedded frame 22 is defined by the nut matching the second positioning screw 41. The present application realizes a detachable connection through the cooperation of the screw and nut, and also ensures the sealing of the connection by providing a sealing gasket 221 to prevent water vapor from leaking from the connection gap, thereby ensuring the sealing and contact effectiveness of the overall structure.

[0033] Preferably, the guide groove 231 of the scraping mechanism 23 is embedded in the frame surface of the embedded frame 22 facing the tube cavity of the first flat tube 13. Preferably, a rotating screw 232 is rotatably inserted in the guide groove 231, and a translation block 233 whose movement direction is limited by the groove cavity of the guide groove 231 is sleeved on the rotating screw 232. Preferably, a scraper strip 234 is provided on the surface of the translation block 233 away from the guide groove 231, which is against the surface of the temperature difference power generation chip 21. Further preferably, a forward and reverse driving motor 235 capable of driving the rotating screw 232 to rotate is also installed at the end of the guide groove 231. Preferably, the forward and reverse driving motor 235 can adopt a conventional existing miniature rotating motor with adjustable rotation direction, so as to effectively drive the rotating screw 232 to rotate forward or reverse. The rotating screw 232 provided in the present application can rotate under the drive of the forward and reverse driving motor 235 to drive the translation block 233 whose moving direction is limited by the guide groove 231 to translate along the groove direction of the guide groove 231 as the rotating screw 232 rotates, thereby driving the scraper 234 to reciprocate and laterally slide across the surface of the temperature difference power generation chip 21 to effectively scrape off impurities and the like attached to the surface of the temperature difference power generation chip 21.

[0034] Preferably, the heat exchange assembly 3 includes a first heat-conducting half shell 31 sealed and embedded on the side tube wall of the first flat tube 14, a second heat-conducting half shell 32 sealed and embedded on the side tube wall of the preheating water pipe 4, and a semiconductor heat exchange plate 33 accommodated in a shell cavity constructed by splicing the first heat-conducting half shell 31 and the second heat-conducting half shell 32. Preferably, the semiconductor heat exchange plate 33 is connected to a parallel circuit for its function, which constructs a first electric circuit with an external power supply and a second electric circuit with the temperature difference power generation chip 21, so as to utilize the heat generated by the temperature difference power generation chip 21 to convert the heat into electric energy for work power supply, thereby reducing the electric energy consumed by external access and reducing the extra energy consumed in the heat recovery process. The semiconductor heat exchange plate 33 provided in the present application is an existing semiconductor heat exchange plate, which can construct electrical circuits with different flow directions according to needs, so as to realize directional transfer of heat, and is used to transfer the heat in the heat transfer airflow to the bathing water in the preheating water pipe 4, so as to realize the preheating of the bathing water required for the facilities in the building, so that the bathing water can be heated to a suitable temperature without consuming too much energy in the subsequent bathing water output process, so that the user can use it.

[0035] Preferably, a second through groove 41 for embedding the thermal power generation component 2 is provided on the side tube wall of the preheating water pipe 4 facing the first flat tube 13, and second positioning screws 42 are arranged at intervals around the second through groove 41. Further preferably, a driving liquid pump 43 and a one-way check valve 44 for driving the directional flow of bathing water are also arranged in the preheating water pipe 4. The preheating water pipe 4 provided in the present application can directional transport the bathing water to be preheated, and can install the thermal power generation component 2 and the heat exchange component 3 at intervals on its tube wall, so as to cooperate with the thermal power generation component 2 to convert heat energy into electrical energy, and can also absorb the heat output by the heat exchange component 3 in a directional manner, thereby ensuring the effective conversion of electrical energy and completing the effective heating of bathing water.

[0036] The present utility model is not limited to the above optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope of the claims of the present utility model fall within the protection scope of the present utility model. Those skilled in the art should understand that the present utility model specification and its drawings are illustrative and do not constitute limitations on the claims. The protection scope of the present utility model is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A building exhaust heat recovery device, comprising a guide air duct (1) capable of being connected to a heat dissipation channel of a building exhaust heat transfer airflow, characterized in that: On the wall of the guide air duct (1), along the flow direction of the heat transfer airflow transported therein, there are arranged at intervals a thermal power generation component (2) capable of utilizing the continuously flowing heat transfer airflow to form a differential temperature field to generate electricity, and a heat exchange component (3) capable of actively transferring heat in the heat transfer airflow flowing through the thermal power generation component (2) to perform secondary recovery of heat energy. A preheating water pipe (4) is also provided on the side of the thermal power generation component (2) and the heat exchange component (3) away from the guide air duct (1), and the two ends of the preheating water pipe (4) are respectively connected to a first building water tank (5) and a second building water tank (6).

2. The building exhaust heat recovery device according to claim 1, characterized in that: The air guide duct (1) comprises an inlet pipe opening (11), an outlet pipe opening (12), a first flat tube (13) and a second flat tube (14), wherein: The output end of the inlet pipe opening (11) is connected to the first flat tube (13), the side of the first flat tube (13) away from the inlet pipe opening (11) is connected to the second flat tube (14), and the side of the second flat tube (14) away from the first flat tube (13) is connected to the outlet pipe opening (12) for discharging the heat transfer airflow; The thermal power generation component (2) and the heat exchange component (3) are respectively installed on the tube walls of the first flat tube (13) and the second flat tube (14).

3. The building exhaust heat recovery device according to claim 2, characterized in that: The thermal power generation component (2) comprises a temperature difference power generation chip (21) capable of converting electric energy using temperature difference, and an embedded frame (22), wherein: The temperature difference power generation chip (21) is detachably mounted in two parallel embedded frames (22). The two embedded frames (22) are respectively embedded in the first flat tube (13) and the preheating water tube (4) which are parallel to each other, so that the two surfaces of the temperature difference power generation chip (21) are respectively placed in the tube cavities of the first flat tube (13) and the preheating water tube (4).

4. The building exhaust heat recovery device according to claim 3, characterized in that: The embedded frame (22) is also provided with a scraping mechanism (23) capable of cleaning the surface of the temperature difference power generation chip (21) placed inside the first flat tube (13) to ensure heat conduction efficiency; The surface of the temperature difference power generation chip (21) placed in the preheating water pipe (4) is also coated with a heat-conducting and waterproof film layer (24).

5. The building exhaust heat recovery device according to claim 4, characterized in that: Sealing gaskets (221) are also provided on the opposite surfaces of the two parallel embedded frames (22), and penetrating positioning holes (222) are opened on the frame surfaces of the two embedded frames (22).

6. The building exhaust heat recovery device according to claim 5, characterized in that: The guide groove (231) of the scraping mechanism (23) is embedded in the frame surface of the embedded frame (22) facing the tube cavity of the first flat tube (13), a rotating screw (232) is rotatably inserted in the guide groove (231), and a translation block (233) whose movement direction is limited by the groove cavity of the guide groove (231) is sleeved on the rotating screw (232). A scraper (234) is provided on the surface of the translation block (233) away from the guide groove (231) and abuts against the surface of the temperature difference power generation chip (21); A forward and reverse driving motor (235) capable of driving the rotating screw (232) to rotate is also installed at the end of the guide groove (231).

7. The building exhaust heat recovery device according to claim 6, characterized in that: The heat exchange assembly (3) comprises a first heat-conducting half shell (31) sealed and embedded in the side tube wall of the first flat tube (13), a second heat-conducting half shell (32) sealed and embedded in the side tube wall of the preheating water pipe (4), and a semiconductor heat exchange plate (33) accommodated in a shell cavity constructed by splicing the first heat-conducting half shell (31) and the second heat-conducting half shell (32).

8. The building exhaust heat recovery device according to claim 7, characterized in that: A first through groove (131) for embedding the thermal power generation component (2) is provided on the side tube wall of the first flat tube (13), and first positioning screws (132) are arranged at intervals around the first through groove (131).

9. The building exhaust heat recovery device according to claim 8, characterized in that: A second through groove (41) for embedding the thermal power generation component (2) is provided on the side tube wall of the preheating water tube (4) facing the first flat tube (13), and second positioning screws (42) are arranged at intervals around the second through groove (41).

10. The building exhaust heat recovery device according to claim 9, characterized in that: A driving liquid pump (43) for driving the bathing water to flow in a directional manner and a one-way check valve (44) are also provided in the preheating water pipe (4).

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