Heating ventilation air conditioner waste heat recovery device

Abstract

The invention relates to the technical field of heating ventilation air conditioner waste heat recovery, and provides a heating ventilation air conditioner waste heat recovery device which is characterized in that a spiral heat exchange pipe and an air inlet pipe are both arranged in a box body, the air inlet pipe is provided with an air inlet, a heat exchange air outlet and a drying air outlet, the air inlet is used for guiding in waste heat warm air of a heating ventilation air conditioner, one end of the spiral heat exchange pipe communicates with the heat exchange air outlet, and the other end of the spiral heat exchange pipe communicates with the drying air outlet; the sealing plug is arranged in the air inlet pipe in a sliding mode, the two ends of the spring act on the sealing plug and the inner wall of the air inlet pipe correspondingly and are used for providing force for the sealing plug to block the drying air outlet, and the drying frame is arranged relative to the drying space in a sliding mode and is used for containing objects to be dried. The drying frame is provided with a pushing part, and after the drying frame slides, the pushing part is used for pushing the sealing plug and opening the drying air outlet. According to the technical scheme, the problem that in the prior art, heat energy in hot air generated during operation of a heating ventilation air conditioner is not effectively utilized is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery of heating, ventilation and air conditioning, and in particular to a waste heat recovery device of heating, ventilation and air conditioning. Background Art

[0002] In modern building environments, HVAC systems are widely used to achieve temperature regulation and air treatment in indoor spaces. During operation, traditional HVAC maintains a comfortable indoor temperature and humidity environment through cooling or heating cycles. However, its outdoor unit will generate a large amount of hot air emissions during operation.

[0003] On the one hand, this part of heat energy is directly lost and not effectively utilized, resulting in energy waste. From the perspective of sustainable energy utilization, this phenomenon of heat energy waste highlights its irrationality.

[0004] On the other hand, the continuous discharge of a large amount of hot air to the outside will significantly increase the temperature of the outdoor environment around the air conditioner outdoor unit. Especially in densely built urban areas, the centralized operation of many HVAC outdoor units will lead to an aggravation of the urban heat island effect, which not only affects the thermal comfort of outdoor personnel, but also has a negative impact on the urban ecosystem and building durability, increasing the water evaporation pressure of urban green plants, accelerating the aging of building facade materials, etc., and also violates the modern society's pursuit of environmental protection and energy conservation and emission reduction.

[0005] Therefore, developing a device that can effectively recover HVAC waste heat has extremely important practical significance and urgent market demand. Summary of the invention

[0006] The present invention provides a HVAC waste heat recovery device, which solves the problem in the related art that the heat energy in the hot air generated by the HVAC operation is not effectively utilized.

[0007] The technical solution of the present invention is as follows: A HVAC waste heat recovery device comprises a box, a spiral heat exchange tube, an air inlet pipe, a drying rack, a sealing plug and a spring, wherein the box is used to store a heat exchange medium. The spiral heat exchange tube and the air inlet pipe are both arranged in the box body. The air inlet pipe has an air inlet, a heat exchange outlet and a drying outlet. The air inlet is used to introduce the residual heat and warm air of the HVAC. One end of the spiral heat exchange tube is connected to the heat exchange outlet, and the other end is used for exhaust. The box body also has a drying space, and the drying outlet is used to communicate with the drying space. The sealing plug is slidably arranged in the air inlet pipe, and the two ends of the spring act on the sealing plug and the inner wall of the air inlet pipe respectively, so as to provide the sealing plug with force to seal the drying air outlet. The drying rack is slidably arranged relative to the drying space, so as to place the objects to be dried. The drying rack is provided with a pushing part, and after the drying rack slides, the pushing part is used to push the sealing plug and open the drying air outlet.

[0008] Optionally, it further includes a motor, a rotating shaft and a spline sleeve, wherein the motor is arranged on the housing, the rotating shaft is rotatably arranged in the housing and passes through the air inlet pipe, the rotating shaft is drivingly connected to the motor, and the spline sleeve is coaxially arranged at the end of the rotating shaft and is located in the drying space. The bottom of the drying rack is provided with a spline body, and the spline body is used for snap-fitting with the spline sleeve.

[0009] Optionally, it also includes a support rod and a hook, wherein the support rod is arranged on the top of the drying rack, there are multiple support rods, and the hook is rotatably arranged on the support rod for hanging the objects to be dried.

[0010] Optionally, it also includes a gear and a gear ring, wherein the gear is rotatably arranged at the end of the support rod, the gear is drivingly connected to the hook, the gear ring is arranged on the box body and located at the top of the box body, and the gear is used to mesh with the gear ring.

[0011] Optionally, it also includes a flexible interlayer, which is tubular, and the top and bottom of the flexible interlayer are respectively arranged on the top wall of the box body and the top of the air inlet pipe, and the interior of the flexible interlayer is the drying space.

[0012] Optionally, a support ring is further included, which is arranged on the drying rack. After the drying rack slides, the support ring contacts the inner wall of the flexible interlayer to expand the flexible interlayer until it contacts the spiral heat exchange tube.

[0013] Optionally, it also includes anti-wear balls, which are movably embedded in the support ring. There are multiple anti-wear balls for contacting the inner wall of the flexible barrier layer.

[0014] Optionally, a filter element is also included, and the filter element is arranged in the air inlet pipe.

[0015] Optionally, a temperature sensor is further included, wherein the temperature sensor is disposed in the box and is used to detect the temperature of the heat exchange medium in the box.

[0016] Optionally, it also includes a control panel and a control switch, wherein the control panel is arranged on the box body and is used to display the temperature of the heat exchange medium in the box body, the temperature sensor is electrically connected to the control panel, and the control switch is arranged on the control panel and is electrically connected to the motor, and is used to control the start and stop of the motor.

[0017] The working principle and beneficial effects of the present invention are: The hot air generated by the outdoor unit enters the air inlet pipe through the air inlet. Since the sealing plug blocks the drying air outlet under the action of the spring, the hot air can only enter the spiral heat exchange tube through the heat exchange outlet. When the hot air flows in the spiral heat exchange tube, it exchanges heat with the heat exchange medium (such as water) in the box, and the heat is transferred to the heat exchange medium, which increases the temperature of the heat exchange medium, thereby realizing the recovery and storage of waste heat. The cold air after heat exchange is discharged from the other end of the spiral heat exchange tube to the external environment. When the heat exchange medium is water, the heated water can be stored in the box and used as domestic water for washing, cleaning, etc., thereby realizing the secondary utilization of energy.

[0018] When there are items that need to be dried, such as clothes, hang the clothes to be dried on the drying rack. Then slide the drying rack inward along the drying space, and the push part on the drying rack contacts the sealing plug and begins to squeeze the sealing plug. When the drying rack slides to the innermost end, the push part overcomes the elastic force of the spring and pushes the sealing plug open, so that the drying air outlet is connected to the drying space. At this time, the hot air generated by the HVAC outdoor unit no longer enters all of the spiral heat exchange tubes, but a part of it enters the drying space through the drying air outlet. The hot air fully contacts the clothes hung on the drying rack in the drying space, evaporates the moisture in the clothes, and thus realizes the drying function of clothes and other items. When the drying is completed, pull the drying rack out of the drying space, and the sealing plug re-blocks the drying air outlet under the action of the spring force, and the device returns to the normal heat exchange and heat storage state.

[0019] This device can not only realize the function of waste heat recovery and heat storage, but also has the function of drying items. Through the synergistic effect of the drying rack, sealing plug and spring, the working mode can be flexibly switched when drying is needed. The user only needs to hang the items on the drying rack and push them into the drying space to start the drying function. No complicated operation procedures and additional equipment are required. Using waste heat to dry clothes and other items expands the application scenarios of HVAC waste heat and improves the practicality of the device. Since the waste heat of HVAC is recycled and utilized, the amount of hot air directly discharged into the external environment is reduced, thereby reducing the temperature rise in the area surrounding the air conditioner outdoor unit. In urban areas with dense buildings, it can effectively alleviate the urban heat island effect caused by the concentrated operation of many HVAC outdoor units, protect the urban ecosystem, reduce the negative effects such as the evaporation pressure of water on urban green plants and the aging of building facade materials, and help create a more comfortable and environmentally friendly urban environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0021] Figure 1 It is a structural schematic diagram of the top of a HVAC waste heat recovery device; Figure 2 It is a structural schematic diagram of the bottom of a HVAC waste heat recovery device; Figure 3 It is a schematic diagram of the internal structure of a HVAC waste heat recovery device; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 It is a structural schematic diagram of the air inlet pipe; Figure 6 is a schematic diagram of the structure of the sealing plug; Figure 7 It is a structural schematic diagram of a drying rack; Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0022] In the figure: 1, box body, 2, spiral heat exchange tube, 3, air inlet pipe, 4, drying rack, 5, sealing plug, 6, spring, 301, air inlet, 302, heat exchange air outlet, 303, drying air outlet, 101, drying space, 7, push part, 8, motor, 9, rotating shaft, 10, spline sleeve, 11, spline body, 12, support rod, 13, hook, 14, gear, 15, gear ring, 16, flexible interlayer, 17, support ring, 18, anti-wear ball, 19, filter, 20, temperature sensor, 21, control panel, 22, control switch. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0024] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0025] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] Reference Figure 1 to Figure 8 , which is the first embodiment of the present invention, proposes a HVAC waste heat recovery device, including a box body 1, a spiral heat exchange tube 2, an air inlet pipe 3, a drying rack 4, a sealing plug 5 and a spring 6, wherein the box body 1 is used to store a heat exchange medium, The spiral heat exchange tube 2 and the air inlet pipe 3 are both arranged in the box body 1. The air inlet pipe 3 has an air inlet 301, a heat exchange air outlet 302 and a drying air outlet 303. The air inlet 301 is used to introduce the residual heat and warm air of the HVAC. One end of the spiral heat exchange tube 2 is connected to the heat exchange air outlet 302, and the other end is used for exhaust. The box body 1 also has a drying space 101. The drying air outlet 303 is used to communicate with the drying space 101. The sealing plug 5 is slidably arranged in the air inlet pipe 3, and the two ends of the spring 6 act on the sealing plug 5 and the inner wall of the air inlet pipe 3 respectively, so as to provide the sealing plug 5 with a force to block the drying air outlet 303. The drying rack 4 is slidably arranged relative to the drying space 101, so as to place the objects to be dried. The drying rack 4 is provided with a pushing portion 7, and after the drying rack 4 slides, the pushing portion 7 is used to push the sealing plug 5 and open the drying air outlet 303.

[0028] In this embodiment, the hot air generated by the external unit enters the air inlet pipe 3 through the air inlet 301. Since the sealing plug 5 blocks the drying air outlet 303 under the action of the spring 6, the hot air can only enter the spiral heat exchange tube 2 through the heat exchange air outlet 302. When the hot air flows in the spiral heat exchange tube 2, it exchanges heat with the heat exchange medium (such as water) in the box body 1, and the heat is transferred to the heat exchange medium, so that the temperature of the heat exchange medium increases, thereby realizing the recovery and heat storage of waste heat. The cold air after heat exchange is discharged from the other end of the spiral heat exchange tube 2 to the external environment. When the heat exchange medium is water, the heated water can be stored in the box body 1 and used as domestic water for washing, cleaning and other purposes, thereby realizing the secondary utilization of energy.

[0029] When there are items that need to be dried, such as clothes, the clothes to be dried are hung on the drying rack 4. Then the drying rack 4 is slid inward along the drying space 101, and the push portion 7 on the drying rack 4 contacts the sealing plug 5 and begins to squeeze the sealing plug 5. When the drying rack 4 slides to the innermost end, the push portion 7 overcomes the elastic force of the spring 6 and pushes the sealing plug 5 open, so that the drying air outlet 303 is connected to the drying space 101. At this time, the hot air generated by the HVAC outdoor unit no longer enters all of the spiral heat exchange tube 2, but a part enters the drying space 101 through the drying air outlet 303. The hot air fully contacts the clothes hung on the drying rack 4 in the drying space 101, and the moisture in the clothes is evaporated, thereby realizing the drying function of the clothes and other items. When the drying is completed, the drying rack 4 is pulled out of the drying space 101, and the sealing plug 5 re-blocks the drying air outlet 303 under the action of the spring 6 force, and the device returns to the normal heat exchange and heat storage state.

[0030] This device can not only realize the function of waste heat recovery and heat storage, but also has the function of drying items. Through the synergistic effect of the drying rack 4, the sealing plug 5 and the spring 6, the working mode can be flexibly switched when drying is needed. The user only needs to hang the items on the drying rack 4 and push them into the drying space 101 to start the drying function, without the need for complicated operating procedures and additional equipment. Using waste heat to dry clothes and other items expands the application scenarios of HVAC waste heat and improves the practicality of the device. Since the waste heat of HVAC is recycled and utilized, the amount of hot air directly discharged into the external environment is reduced, thereby reducing the temperature rise in the area surrounding the air conditioner outdoor unit. In urban areas with dense buildings, it can effectively alleviate the urban heat island effect caused by the concentrated operation of many HVAC outdoor units, protect the urban ecosystem, reduce the negative effects such as the evaporation pressure of water on urban green plants and the aging of building facade materials, and help create a more comfortable and environmentally friendly urban environment.

[0031] Furthermore, it also includes a motor 8, a rotating shaft 9 and a spline sleeve 10, wherein the motor 8 is arranged on the housing 1, the rotating shaft 9 is rotatably arranged in the housing 1 and passes through the air inlet pipe 3, the rotating shaft 9 is drivingly connected to the motor 8, and the spline sleeve 10 is coaxially arranged at the end of the rotating shaft 9 and is located in the drying space 101. The bottom of the drying rack 4 has a spline body 11 , and the spline body 11 is used for snap-fitting with the spline sleeve 10 .

[0032] In this embodiment, in the initial state, the motor 8 is in a stopped state, the drying rack 4 is located outside the drying space 101, and the spline body 11 is not in contact with the spline sleeve 10. When an object needs to be dried and the drying rack 4 is inserted into the drying space 101, the object to be dried is first hung on the drying rack 4, and then the drying rack 4 is slid inward along the drying space 101. When the drying rack 4 slides to the bottom, the spline body 11 at the bottom is aligned with and inserted into the spline sleeve 10 at the end of the rotating shaft 9, so that the two are snap-fitted.

[0033] The motor 8 is connected to the rotating shaft 9 through a synchronous belt. After the motor 8 is turned on, the power of the motor 8 is transmitted to the rotating shaft 9 through the synchronous belt, so that the rotating shaft 9 starts to rotate. Due to the meshing of the spline body 11 and the spline sleeve 10, the rotation of the rotating shaft 9 drives the drying rack 4 to rotate together. As the drying rack 4 rotates, all parts of the article can be evenly exposed to the hot air, rather than only a few fixed parts being continuously heated.

[0034] The drying rack 4 rotates in the drying space 101 through the coordinated work of the motor 8, the rotating shaft 9, the spline sleeve 10 and the spline body 11. During the drying process, the items to be dried are no longer in a relatively static state to receive the hot air, but can be in contact with the hot air in all directions. This dynamic drying method greatly improves the uniformity of drying and avoids the problem of incomplete drying or local over-drying of items due to uneven local heating.

[0035] Furthermore, it also includes a support rod 12 and a hook 13. The support rod 12 is arranged on the top of the drying rack 4. There are multiple support rods 12. The hook 13 is rotatably arranged on the support rod 12 and is used to hang the objects to be dried.

[0036] Furthermore, it also includes a gear 14 and a ring gear 15. The gear 14 is rotatably arranged at the end of the support rod 12. The gear 14 is drivingly connected to the hook 13. The ring gear 15 is arranged on the box body 1 and is located at the top of the box body 1. The gear 14 is used to mesh with the ring gear 15.

[0037] In this embodiment, when the drying rack 4 is inserted to the bottom, the gear 14 at the end of the support rod 12 will mesh with the ring gear 15 at the top of the housing 1. The motor 8 drives the rotating shaft 9 to rotate, and the drying rack 4 rotates with the rotating shaft 9. During the rotation of the drying rack 4, since the gear 14 and the ring gear 15 are in meshing state, the gear 14 will rotate under the action of the ring gear 15, and the gear 14 will continuously roll along the contour of the ring gear 15. The mandrel of the gear 14 and the mandrel of the hook 13 are sleeved with a synchronous belt, thereby driving the hook 13 and the articles to be dried hung on the hook 13 to rotate. This allows every part of the clothes to fully contact the hot air in the drying space 101. After the drying rack 4 is pulled out of the drying space 101, the gear 14 is disengaged from the ring gear 15.

[0038] Through the meshing relationship between the gear 14 and the ring gear 15, the objects to be dried on the hook 13 rotate on the basis of the revolution of the drying rack 4. This composite motion mode makes the objects to be dried in the drying space 101 more comprehensive and uniformly heated, can effectively reduce the drying dead corners, and improve the drying efficiency and energy utilization.

[0039] Furthermore, it also includes a flexible interlayer 16, which is tubular. The top and bottom of the flexible interlayer 16 are respectively arranged on the top wall of the box body 1 and the top of the air inlet pipe 3, and the interior of the flexible interlayer 16 is the drying space 10.

[0040] Furthermore, it also includes a support ring 17, which is arranged on the drying rack 4. After the drying rack 4 slides, the support ring 17 contacts the inner wall of the flexible barrier layer 16 to expand the flexible barrier layer 16 until it contacts the spiral heat exchange tube 2.

[0041] Furthermore, it also includes anti-wear balls 18 , which are movably embedded in the support ring 17 . There are multiple anti-wear balls 18 for contacting the inner wall of the flexible barrier layer 16 .

[0042] In this embodiment, the flexible interlayer 16 is installed inside the box body 1, and its top is sealed and connected to the top wall of the box body 1, and its bottom is sealed and connected to the top of the air inlet pipe 3, forming an independent tubular space, namely the drying space 101. The flexible interlayer 16 is made of a material that is resistant to high temperatures, has a certain degree of flexibility, and has good air tightness, such as a high-temperature resistant silicone material. A plurality of anti-wear balls 18 are evenly embedded in the outer circumference of the support ring 17. The anti-wear balls 18 can roll freely in the embedded grooves of the support ring 17. The surface of the balls is smooth, and the material has a certain degree of wear resistance, such as ceramic balls.

[0043] In the normal heat exchange and heat storage state, the heat exchange medium (water) in the box 1 applies pressure to the flexible interlayer 16, causing the flexible interlayer 16 to deform toward the middle and not contact the spiral heat exchange tube 2. The spiral heat exchange tube 2 can fully contact the water outside the tube to perform heat exchange.

[0044] When drying is required, as the drying rack 4 is inserted into the drying space 101, the support ring 17 applies an outward force to the flexible interlayer 16, gradually expanding the flexible interlayer 16 that was originally deformed toward the middle. In this process, the anti-wear balls 18 are in contact with the inner wall of the flexible interlayer 16. As the support ring 17 moves, the anti-wear balls 18 roll on the inner wall of the flexible interlayer 16, reducing friction, so that the support ring 17 can smoothly expand the flexible interlayer 16.

[0045] When the drying rack 4 is inserted to the bottom, the flexible interlayer 16 is stretched open by the support ring 17 and fits onto the spiral heat exchange tube 2. Since the flexible interlayer 16 fits onto the spiral heat exchange tube 2, the heat conduction effect in the drying space 101 is improved. When the motor 8 drives the rotating shaft 9 to rotate, and then drives the drying rack 4 to rotate, the anti-wear balls 18 roll on the inner wall of the flexible interlayer 16, which not only ensures that the support ring 17 is in the stretched state of the flexible interlayer 16, but also avoids the wear of the flexible interlayer 16. When the drying rack 4 is pulled out of the drying space 101, the support ring 17 leaves the inside of the flexible interlayer 16, and the flexible interlayer 16 recovers its deformation toward the middle again under the pressure of the water in the box 1, and the device returns to the normal heat exchange and heat storage state.

[0046] Furthermore, it also includes a filter element 19 , which is arranged in the air inlet pipe 3 .

[0047] In this embodiment, the filter element 19 can be composed of a fiber filter and an activated carbon filter, which can filter particulate impurities and absorb odors and harmful gases. After entering the air inlet pipe 3, the hot air generated by the HVAC operation will first pass through the filter element 19.

[0048] The filter element 19 can effectively filter out dust particles, foreign matter and peculiar smell carried by the hot air. When drying articles such as clothes, impurities are prevented from being contaminated on the surface of the articles, thus ensuring the cleanliness and quality of the articles after drying.

[0049] Furthermore, a temperature sensor 20 is included. The temperature sensor 20 is arranged in the box body 1 and is used to detect the temperature of the heat exchange medium in the box body 1.

[0050] Furthermore, it also includes a control panel 21 and a control switch 22. The control panel 21 is arranged on the box body 1 and is used to display the temperature of the heat exchange medium in the box body 1. The temperature sensor 20 is electrically connected to the control panel 21. The control switch 22 is arranged on the control panel 21 and is electrically connected to the motor 8, and is used to control the start and stop of the motor 8.

[0051] In this embodiment, the temperature sensor 20 is electrically connected to the control panel 21 through a wire to ensure stable signal transmission. The control switch 22 is connected to the motor 8 through an electrical circuit so that the control switch 22 can effectively control the power on and off of the motor 8, thereby realizing the control of the rotation of the drying rack 4.

[0052] The temperature sensor 20 monitors the temperature of the heat exchange medium in the box 1 in real time. The temperature sensor 20 continuously collects water temperature data and converts the data into electrical signals and transmits them to the control panel 21. After receiving the signal, the control panel 21 processes it internally and displays the current temperature of the heat exchange medium on the display screen.

[0053] When drying is required, the user can control the start and stop of the motor 8 through the control switch 22 on the control panel 21. By pressing the start button, the control switch 22 is closed, the motor 8 is powered on and starts to run, driving the rotating shaft 9 and the drying rack 4 to start rotating. During the drying process, the user can stop the motor 8 at any time through the control switch 22 according to the drying requirements of the items and the observed drying conditions.

[0054] The integrated design of the temperature sensor 20, the control panel 21 and the control switch 22 has a certain level of intelligence. Through real-time temperature monitoring and intelligent control of the motor 8, the device can better adapt to different working conditions and user needs, reduce the frequency and difficulty of manual intervention, improve the applicability and operating efficiency of the device, and conform to the development trend of modern intelligent equipment.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A HVAC waste heat recovery device, characterized in that: The invention comprises a box body (1), a spiral heat exchange tube (2), an air inlet pipe (3), a drying rack (4), a sealing plug (5) and a spring (6), wherein the box body (1) is used to store a heat exchange medium. The spiral heat exchange tube (2) and the air inlet tube (3) are both arranged in the housing (1); the air inlet tube (3) is provided with an air inlet (301), a heat exchange air outlet (302) and a drying air outlet (303); the air inlet (301) is used to introduce waste heat warm air from the HVAC; one end of the spiral heat exchange tube (2) is connected to the heat exchange air outlet (302), and the other end is used for exhausting air; the housing (1) also has a drying space (101); the drying air outlet (303) is used to communicate with the drying space (101); The sealing plug (5) is slidably arranged in the air inlet pipe (3); the two ends of the spring (6) act on the sealing plug (5) and the inner wall of the air inlet pipe (3) respectively, and are used to provide a force for the sealing plug (5) to block the drying air outlet (303); the drying rack (4) is slidably arranged relative to the drying space (101) and is used to place objects to be dried; the drying rack (4) is provided with a pushing portion (7); after the drying rack (4) slides, the pushing portion (7) is used to push the sealing plug (5) and open the drying air outlet (303).

2. A HVAC waste heat recovery device according to claim 1, characterized in that: It also comprises a motor (8), a rotating shaft (9) and a spline sleeve (10), wherein the motor (8) is arranged on the housing (1), the rotating shaft (9) is rotatably arranged in the housing (1) and passes through the air inlet pipe (3), the rotating shaft (9) is drivingly connected to the motor (8), and the spline sleeve (10) is coaxially arranged at the end of the rotating shaft (9) and is located in the drying space (101). The drying rack (4) has a spline body (11) at the bottom, and the spline body (11) is used for snap-fitting with the spline sleeve (10).

3. The HVAC waste heat recovery device according to claim 1, characterized in that: It also comprises a support rod (12) and a hook (13), wherein the support rod (12) is arranged at the top of the drying rack (4), there are a plurality of support rods (12), and the hook (13) is rotatably arranged on the support rod (12) and is used to hang the objects to be dried.

4. A HVAC waste heat recovery device according to claim 3, characterized in that: It also includes a gear (14) and a gear ring (15), wherein the gear (14) is rotatably arranged at the end of the support rod (12), the gear (14) is drivingly connected to the hook (13), the gear ring (15) is arranged on the box body (1) and is located at the top of the box body (1), and the gear (14) is used to mesh with the gear ring (15).

5. The HVAC waste heat recovery device according to claim 1, characterized in that: It also comprises a flexible interlayer (16), the flexible interlayer (16) being tubular, the top and bottom of the flexible interlayer (16) being respectively arranged on the top wall of the box body (1) and the top of the air inlet pipe (3), and the interior of the flexible interlayer (16) being the drying space (101).

6. A HVAC waste heat recovery device according to claim 5, characterized in that: It also comprises a support ring (17), wherein the support ring (17) is arranged on the drying rack (4), and after the drying rack (4) slides, the support ring (17) contacts the inner wall of the flexible barrier layer (16) to expand the flexible barrier layer (16) until it contacts the spiral heat exchange tube (2).

7. A HVAC waste heat recovery device according to claim 6, characterized in that: It also includes anti-wear balls (18), which are movably embedded in the support ring (17). There are a plurality of anti-wear balls (18) for contacting the inner wall of the flexible barrier layer (16).

8. The HVAC waste heat recovery device according to claim 1, characterized in that: It also includes a filter element (19), wherein the filter element (19) is arranged in the air inlet pipe (3).

9. The HVAC waste heat recovery device according to claim 2, characterized in that: It also comprises a temperature sensor (20), wherein the temperature sensor (20) is arranged in the box (1) and is used to detect the temperature of the heat exchange medium in the box (1).

10. A HVAC waste heat recovery device according to claim 9, characterized in that: It also includes a control panel (21) and a control switch (22); the control panel (21) is arranged on the housing (1) and is used to display the temperature of the heat exchange medium in the housing (1); the temperature sensor (20) is electrically connected to the control panel (21); the control switch (22) is arranged on the control panel (21) and is electrically connected to the motor (8) and is used to control the start and stop of the motor (8).

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