Waste heat recovery device of heating ventilation air conditioner

Abstract

The invention relates to the technical field of air conditioner waste heat recovery, and particularly discloses a heating ventilation air conditioner waste heat recovery device which comprises a box body, a water guide unit, a ventilation unit and a heat exchange unit, the water guide unit, the ventilation unit and the heat exchange unit are arranged in the box body, the heat exchange unit comprises a plurality of heat exchange cylinders arranged in the box body, each heat exchange cylinder is provided with a first valve and a second valve, and an air bag is arranged in each heat exchange cylinder. The air bag is connected with a driving assembly for expanding or shrinking the air bag; the water guide unit comprises a spiral coil arranged in the heat exchange cylinder, the ventilation unit is used for sequentially introducing gas into the heat exchange cylinder, when gas is introduced, the first valve and the second valve are opened, when ventilation is stopped, the first valve and the second valve are closed, and the driving assembly drives the air bag to expand and contract repeatedly. According to the waste heat recovery device for the heating ventilation air conditioner, high-temperature gas can be gathered towards the spiral coil area, the heat exchange efficiency is improved, meanwhile, the high-temperature gas can flow through expansion and contraction of the air bag, and gas waste heat is fully recycled while the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning waste heat recovery, and particularly to a waste heat recovery device for heating, ventilation, and air conditioning (HVAC). Background Art

[0002] The waste heat in an HVAC system refers to the heat generated during operation that is not fully utilized and discharged into the environment. Reasonably recovering and utilizing this waste heat can not only improve energy utilization efficiency but also reduce energy consumption and operating costs, which is of great significance for energy conservation and emission reduction.

[0003] A Chinese patent with the publication number CN117537475B discloses a waste heat recovery device for HVAC, including a box body, a gas guiding unit, a water guiding unit, and a control unit. A heat exchange chamber is provided inside the box body; the gas guiding unit includes an air inlet pipe, a ventilation cylinder, and an air outlet pipe, and both the air inlet pipe and the air outlet pipe penetrate through the box body; there are multiple ventilation cylinders, all located inside the heat exchange chamber, with their bottoms connected to the air outlet pipe and their tops connected to the air inlet pipe; the ventilation cylinders are evenly distributed along the inner wall of the heat exchange chamber; the control unit is located inside the heat exchange chamber and includes a connecting seat, a turntable, and a motor; an air flow channel is provided inside the turntable, with one end of the air flow channel connected to the air inlet pipe and the other end connected to the ventilation cylinder; the motor drives the turntable to rotate, so that the air inlet pipe is sequentially connected to multiple ventilation cylinders.

[0004] Through the control unit in the above patent, the air flow channel is sequentially connected to the ventilation cylinders to input high-temperature air flow, so that the other ventilation cylinders remain closed, extending the heat exchange time of the high-temperature air flow in the ventilation cylinders and improving the waste heat recovery efficiency. However, in the actual implementation process of the above patent, after the high-temperature air flow input into the ventilation cylinder remains closed, it will gradually tend to be stable. The gas concentrated near the water guiding unit in the ventilation cylinder can smoothly exchange heat with the water guiding unit, while the heat of the gas far from the water guiding unit cannot be fully utilized, resulting in energy waste and low energy utilization efficiency.

[0005] Therefore, there is a need in the art for a waste heat recovery device for HVAC to solve the above problems. Summary of the Invention

[0006] The present invention provides a waste heat recovery device for HVAC, aiming to solve the problems in the related art that the high-temperature gas in the ventilation cylinder cannot flow, resulting in the heat of the gas not being fully utilized, causing energy waste and low waste heat recovery efficiency.

[0007] The waste heat recovery device for HVAC of the present invention includes a box body, a water guiding unit, a ventilation unit, and a heat exchange unit provided inside the box body. The heat exchange unit includes multiple heat exchange cylinders provided inside the box body. A first valve and a second valve are provided on the heat exchange cylinder. An airbag is provided inside the heat exchange cylinder, and the airbag is connected to a driving component that causes it to expand or contract. The water guiding unit includes a spiral coil pipe arranged inside the heat exchange cylinder. The air venting unit is used to sequentially introduce gas into the heat exchange cylinder. When introducing gas, the first valve and the second valve are opened. When stopping the gas venting, the first valve and the second valve are closed, and the driving assembly drives the airbag to expand and contract repeatedly.

[0008] In the present invention, by arranging an airbag inside the heat exchange cylinder, during the expansion process of the airbag, the high-temperature gas can be gathered towards the spiral coil pipe area, thereby improving the heat exchange efficiency. At the same time, the periodic expansion and contraction actions of the airbag can stir the high-temperature gas inside the heat exchange cylinder, prompting it to form a flow around the spiral coil pipe. Compared with the state where the high-temperature gas is stationary inside the heat exchange cylinder, this design not only further optimizes the heat exchange efficiency but also realizes the full recovery and utilization of the waste heat of the gas, significantly reducing energy consumption and waste.

[0009] Preferably, an installation cylinder is fixedly connected to the lower part of each heat exchange cylinder. A gas storage cavity is arranged inside the installation cylinder. A communication pipe for communicating the gas storage cavity and the inside of the airbag is arranged inside the airbag. The driving assembly includes a driving member and a piston assembly slidably arranged inside the gas storage cavity. The driving member drives the piston assembly to move along the gas storage cavity, and the gas in the gas storage cavity and the airbag moves along the communication pipe.

[0010] Preferably, the piston assembly includes a piston plate, a first lead screw and a second lead screw fixedly connected to the piston plate. A first rotating cylinder threadedly engaged with the first lead screw and a second rotating cylinder threadedly engaged with the second lead screw are rotatably connected to the installation cylinder. The driving member includes a first gear fixedly connected to the first rotating cylinder, a second gear fixedly connected to the second rotating cylinder, and a driving structure for driving the first gear and the second gear to rotate. When the driving structure drives the first gear to rotate, the first gear drives the first lead screw through the first rotating cylinder to drive the piston plate to compress the space inside the gas storage cavity, so that the airbag is inflated. When the driving structure drives the second gear to rotate, the second gear drives the second lead screw through the second rotating cylinder to drive the piston plate to suck the gas inside the airbag, so that the airbag retracts.

[0011] Preferably, the radial cross-section of the box body is circular. A coaxially arranged mounting seat is rotatably connected inside the box body. The installation cylinder is fixedly installed on the mounting seat and is evenly distributed at intervals around the central axis of the mounting seat. The air venting unit includes an air inlet pipe communicated with the outside and an air outlet pipe located inside the box body. A driving mechanism for driving the mounting seat to drive the installation cylinder and the heat exchange cylinder to rotate is arranged on the box body. When the heat exchange cylinder is aligned with the air outlet pipe, the driving mechanism pauses driving.

[0012] The mounting base is driven by a driving mechanism to drive the heat exchange cylinder to rotate, which facilitates the sequential ventilation of multiple heat exchange cylinders relative to the outlet pipe of the ventilation unit. Moreover, when one heat exchange cylinder is ventilated, the other heat exchange cylinders remain in a closed state, which can extend the residence time of high-temperature gas in the heat exchange cylinder, thereby improving the heat exchange efficiency.

[0013] Preferably, the driving structure includes a toothed ring rotatably connected to the outer periphery of the mounting cylinder and a toothed gear provided on the inner wall of the box body. The toothed ring meshes with the toothed gear. A ring groove is formed on one side of the toothed ring facing the mounting cylinder. A plurality of tooth segments are respectively provided on the upper and lower groove walls of the ring groove. The tooth segments are spaced apart around the central axis of the toothed ring. When the mounting base drives the mounting cylinder to rotate, the toothed ring rotates along the toothed gear. The tooth segments on the upper groove wall of the ring groove drive the first gear to rotate, and the tooth segments on the lower groove wall of the ring groove drive the second gear to rotate.

[0014] By utilizing the rotation process of the mounting base, the driving of the piston plate is realized, and there is no need to separately provide a driving source for the piston plate, with a compact and ingenious structure.

[0015] Preferably, the driving mechanism includes a motor fixedly installed on the box body and a driving gear fixedly connected to the output end of the motor. The mounting base is fixedly connected with a support rod arranged coaxially. The support rod is fixedly connected with a driven gear meshing with the driving gear. The motor drives the driving gear to drive the driven gear and the support rod to rotate, and the support rod drives the mounting base to rotate.

[0016] Preferably, an installation box communicated with the inlet pipe is arranged in the box body. The outlet pipe is communicated with the installation box and is slidably matched with the installation box in the vertical direction. An automatic telescopic rod for driving the outlet pipe to move vertically is arranged on the installation box.

[0017] The outlet pipe is driven to move vertically by the automatic telescopic rod, so as to realize the connection or disconnection between the outlet pipe and the heat exchange cylinder, avoid interference between the heat exchange cylinder and the outlet pipe when replacing the heat exchange cylinder, and ensure the normal operation of the outlet pipe and the heat exchange cylinder.

[0018] Preferably, the water guiding unit further includes a water inlet pipe and a water outlet pipe. The water inlet pipe penetrates through the bottom of the box body and is fixedly connected with the mounting base. The spiral coils in each heat exchange cylinder are communicated with the water inlet pipe. A water storage cavity is formed between the mounting base and the bottom of the box body. The water outlet pipe is located in the heat exchange cylinder and is communicated with the corresponding spiral coil. The water outlet pipe penetrates through the mounting cylinder and the mounting base and extends into the water storage cavity. A drain pipe communicating the water storage cavity with the external environment is arranged at the bottom of the box body.

[0019] Preferably, the mounting base is rotatably matched with the bottom of the box body through a thrust bearing.

[0020] Through the rotational fit of the thrust bearing, the frictional force during the rotation between the mounting seat and the box body is reduced, which is beneficial to improving the smoothness and stability of the mounting seat during rotation.

[0021] Preferably, four of the air bags are arranged in each of the heat exchange cylinders, four of the air storage cavities are correspondingly arranged in the mounting cylinder, and the connecting pipes in each of the air bags are communicated with the corresponding air storage cavities.

[0022] The beneficial effects of the present invention are as follows: By arranging air bags inside the heat exchange cylinder, the air bags can cause high-temperature gas to gather in the area of the spiral coil during the expansion process, thereby improving the heat exchange efficiency. At the same time, the periodic expansion and contraction actions of the air bags can stir the high-temperature gas in the heat exchange cylinder, promoting it to flow around the spiral coil. Compared with the state where the high-temperature gas is stationary in the heat exchange cylinder, this design not only further optimizes the heat exchange efficiency but also realizes the full recovery and utilization of the waste heat of the gas, significantly reducing energy consumption and waste. Description of the Drawings

[0023] Figure 1 is the front view of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0024] Figure 2 is the axial sectional view of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0025] Figure 3 is the radial sectional view of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0026] Figure 4 is the assembly schematic diagram of the heat exchange cylinder, mounting cylinder, and gear ring of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0027] Figure 5 is the sectional view of the heat exchange cylinder, mounting cylinder, and gear ring of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0028] Figure 6 is the radial sectional view of the mounting cylinder and gear ring of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0029] Figure 7 is the sectional view of the box body and mounting seat of the waste heat recovery device for heating, ventilation, and air conditioning of the present invention.

[0030] Reference Signs: 1. Box body; 11. Exhaust port; 12. Installation box; 13. Automatic telescopic rod; 14. Motor; 15. Driving gear; 16. Ring gear; 17. Drain pipe; 2. Heat exchange cylinder; 21. Valve I; 22. Valve II; 3. Airbag; 31. Connecting pipe; 4. Spiral coil pipe; 41. Water inlet pipe; 42. Water outlet pipe; 5. Air inlet pipe; 51. Air outlet pipe; 6. Mounting seat; 61. Thrust bearing; 62. Support rod; 63. Driven gear; 7. Installation cylinder; 71. Air storage cavity; 72. Rotating cylinder I; 73. Rotating cylinder II; 74. Gear I; 75. Gear II; 8. Piston plate; 81. Lead screw I; 82. Lead screw II; 9. Tooth ring; 91. Ring groove; 92. Tooth segment; 10. Water storage cavity. Detailed implementation mode

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0032] As Figures 1 to 7 shown, the waste heat recovery device for heating, ventilation and air conditioning of the present invention includes a box body 1, a water guiding unit, an air ventilation unit and a heat exchange unit arranged in the box body 1. The heat exchange unit includes four heat exchange cylinders 2 arranged in the box body 1. A valve I 21 is arranged at the top of the heat exchange cylinder 2, and a valve II 22 is arranged on the side. The valve I 21 is a one-way valve, allowing high-temperature gas to enter the heat exchange cylinder 2 from the outside, and the valve II 22 is an electromagnetic valve. An airbag 3 is arranged in the heat exchange cylinder 2, and the airbag 3 is connected with a driving component for expanding or contracting it. The water guiding unit includes a spiral coil pipe 4 arranged in the heat exchange cylinder 2, and the air ventilation unit is used to sequentially introduce high-temperature gas into the heat exchange cylinder 2.

[0033] When introducing high-temperature gas, the valve I 21 and the valve II 22 are opened. The high-temperature gas enters the heat exchange cylinder 2 from the valve I 21, and the gas that has completed heat exchange in the heat exchange cylinder 2 is discharged from the valve II 22. An exhaust port 11 is opened on the box body 1, and the gas discharged from the heat exchange cylinder 2 enters the box body 1 and is discharged from the exhaust port 11. When the ventilation stops, the valve I 21 and the valve II 22 are closed, so that the high-temperature gas remains in the heat exchange cylinder 2 and exchanges heat with the water in the spiral coil pipe 4 of the water guiding unit.

[0034] After stopping the ventilation into the heat exchange cylinder 2, control the driving component to drive the airbag 3 to expand and contract repeatedly. During the expansion process of the airbag 3, the high-temperature gas can be concentrated near the spiral coil pipe 4, improving the heat exchange efficiency. Moreover, during the process of repeated expansion and contraction, the high-temperature gas in the heat exchange cylinder 2 can be stirred, making the high-temperature gas flow around the spiral coil pipe 4. Compared with the situation where the gas is stationary in the heat exchange cylinder 2, not only the heat exchange efficiency is improved, but also the waste heat of the gas is fully recovered, reducing energy waste.

[0035] The ventilation unit includes an intake pipe 5 communicating with the outside and an outlet pipe 51 located inside the box body 1. An installation box 12 communicating with the intake pipe 5 is arranged inside the box body 1. The outlet pipe 51 communicates with the installation box 12 and is slidably matched with the installation box 12 vertically. An automatic telescopic rod 13 for driving the outlet pipe 51 to move vertically is arranged on the installation box 12. As an example, the automatic telescopic rod 13 is an electric push rod. When the heat exchange cylinder 2 is located below the outlet pipe 51, the automatic telescopic rod 13 drives the outlet pipe 51 to move downward to align with the valve 21 on the heat exchange cylinder 2, so as to introduce high-temperature gas into the heat exchange cylinder 2. When the ventilation stops, the automatic telescopic rod 13 drives the outlet pipe 51 to move upward to disengage from the contact with the heat exchange cylinder 2, so as to replace the next heat exchange cylinder 2 for ventilation.

[0036] Continue to refer to Figure 2 and Figure 3 , the radial cross-section of the box body 1 is circular, and a coaxially arranged mounting seat 6 is rotatably connected inside the box body 1. The mounting seat 6 is rotatably matched with the bottom of the box body 1 through a thrust bearing 61. The heat exchange cylinder 2 is installed on the mounting seat 6 and is evenly distributed at intervals around the central axis of the mounting seat 6. A driving mechanism for driving the mounting seat 6 to drive the heat exchange cylinder 2 to rotate is arranged on the box body 1, so that the four heat exchange cylinders 2 are sequentially opposite to the outlet pipe 51 of the ventilation unit for ventilation. When one heat exchange cylinder 2 is ventilated, the other heat exchange cylinders 2 remain in a closed state, prolonging the residence time of the high-temperature gas in the heat exchange cylinder 2, thereby improving the heat exchange efficiency.

[0037] The driving mechanism includes a motor 14 fixedly installed on the box body 1 and a driving gear 15 fixedly connected to the output end of the motor 14. The mounting seat 6 is fixedly connected with a coaxially arranged support rod 62, and the support rod 62 is fixedly connected with a driven gear 63 meshing with the driving gear 15. The motor 14 drives the driving gear 15 to drive the driven gear 63 and the support rod 62 to rotate, and the support rod 62 drives the mounting seat 6 to rotate.

[0038] As Figures 4 to 6 shown, mounting cylinders 7 are respectively fixedly connected below each heat exchange cylinder 2. Four gas storage cavities 71 are arranged inside the mounting cylinder 7. The four air bags 3 inside the heat exchange cylinder 2 are respectively communicated with the corresponding gas storage cavities 71, and a communicating pipe 31 for communicating with the corresponding gas storage cavity 71 is arranged inside the air bag 3.

[0039] The driving assembly includes a driving member and a piston assembly slidably disposed in the air storage cavity 71. The driving member drives the piston assembly to move along the air storage cavity 71, and the gas in the air storage cavity 71 and the airbag 3 moves along the connecting pipe 31. The piston assembly includes a piston plate 8 and a first lead screw 81 and a second lead screw 82 fixedly connected to the piston plate 8. A first rotating cylinder 72 threadedly engaged with the first lead screw 81 and a second rotating cylinder 73 threadedly engaged with the second lead screw 82 are rotatably connected to the mounting cylinder 7. The driving member includes a first gear 74 fixedly connected to the first rotating cylinder 72, a second gear 75 fixedly connected to the second rotating cylinder 73, and a driving structure for driving the first gear 74 and the second gear 75 to rotate.

[0040] When the driving structure drives the first gear 74 to rotate, the first gear 74 drives the first lead screw 81 through the first rotating cylinder 72 to drive the piston plate 8 to compress the space in the air storage cavity 71, so as to inflate the airbag 3; when the driving structure drives the second gear 75 to rotate, the second gear 75 drives the second lead screw 82 through the second rotating cylinder 73 to drive the piston plate 8 to suck the gas in the airbag 3, so as to retract the airbag 3.

[0041] As Figures 4 to 7 shown, the driving structure includes a toothed ring 9 rotatably connected to the outer periphery of the mounting cylinder 7 and a toothed ring 16 provided on the inner wall of the box body 1, and the toothed ring 9 is meshed with the toothed ring 16. A ring groove 91 is formed on the side of the toothed ring 9 facing the mounting cylinder 7, and a plurality of tooth segments 92 are respectively provided on the upper and lower groove walls of the ring groove 91, and the tooth segments 92 are distributed at intervals around the central axis of the toothed ring 9. When the mounting seat 6 drives the mounting cylinder 7 to rotate, the toothed ring 9 rotates along the toothed ring 16, and the tooth segments 92 on the upper groove wall of the ring groove 91 drive the first gear 74 to rotate, and the tooth segments 92 on the lower groove wall of the ring groove 91 drive the second gear 75 to rotate. The first gear 74 and the second gear 75 corresponding to the same airbag 3 rotate alternately to realize the repeated expansion and contraction of the airbag 3. Among the four airbags 3, when two airbags 3 are inflated and expanded, the other two airbags 3 contract synchronously.

[0042] As Figure 2 、 Figure 3 and Figure 7 shown, the water guiding unit further includes a water inlet pipe 41 and a water outlet pipe 42. The water inlet pipe 41 penetrates through the bottom of the box body 1 and is fixedly connected to the mounting seat 6, and the spiral coiled pipes 4 in each heat exchange cylinder 2 are communicated with the water inlet pipe 41. A water storage cavity 10 is formed between the mounting seat 6 and the bottom of the box body 1. The water outlet pipe 42 is located in the heat exchange cylinder 2 and is communicated with the corresponding spiral coiled pipe 4. The water outlet pipe 42 penetrates through the mounting cylinder 7 and the mounting seat 6 and extends into the water storage cavity 10. A drain pipe 17 communicating the water storage cavity 10 and the external environment is provided at the bottom of the box body 1. The water after heat exchange flows from the water outlet pipe 42 into the water storage cavity 10 and is discharged from the drain pipe 17.

[0043] The specific working process of a waste heat recovery device for a heating, ventilation, and air conditioning system of the present invention is as follows: Control the motor 14 to drive the driving gear 15 to drive the driven gear 63 and the support rod 62 to rotate. The support rod 62 drives the mounting seat 6 to rotate, so that one of the heat exchange cylinders 2 is aligned with the air outlet pipe 51. Control the automatic telescopic rod 13 to drive the air outlet pipe 51 to move downward and contact the valve 21 on the heat exchange cylinder 2. Control the valve 22 on the heat exchange cylinder 2 to open, and introduce high-temperature gas through the air inlet pipe 5. The high-temperature gas enters the heat exchange cylinder 2 through the valve 21, and the cold gas that has completed heat exchange in the heat exchange cylinder 2 is squeezed out from the valve 22. Introduce cold water into the spiral coil 4 through the water inlet pipe 41. The cold water flows in the spiral coil 4 and exchanges heat with the high-temperature gas in the heat exchange cylinder 2. After the ventilation is completed, control the automatic telescopic rod 13 to drive the air outlet pipe 51 to move upward and separate from the heat exchange cylinder 2, and control the motor 14 to drive the mounting seat 6 to continue rotating. The mounting seat 6 drives the next heat exchange cylinder 2 to be aligned with the air outlet pipe 51 for ventilation. During the rotation of the mounting seat 6, the toothed ring 9 on the outer circumference of the mounting cylinder 7 rotates along the toothed ring 16. When the tooth segment 92 on the upper groove wall of the annular groove 91 contacts the first gear 74, it drives the first gear 74 to drive the rotating cylinder 72 to rotate. The rotating cylinder 72 drives the piston plate 8 to compress the space in the air storage cavity 71 through the first lead screw 81, so that the corresponding airbag 3 is inflated. When the tooth segment 92 on the lower groove wall of the annular groove 91 contacts the second gear 75, it drives the second gear 75 to drive the rotating cylinder 73 to rotate. The rotating cylinder 73 drives the piston plate 8 to suck the gas in the airbag 3 through the second lead screw 82, so that the airbag 3 retracts, thereby making the high-temperature gas in the heat exchange cylinder 2 flow.

[0044] It can be understood that although four airbags 3 are provided in the heat exchange cylinder 2 in the above embodiment, this is not a limitation on the number of airbags 3 provided. In other embodiments, two or three airbags 3 can also be provided in the heat exchange cylinder 2.

[0045] It can be understood that in other embodiments, the driving assembly for driving the airbag 3 to expand or contract can also be set to include a piston plate 8 and an automatic telescopic cylinder. One end of the automatic telescopic cylinder is fixedly connected to the cylinder wall of the mounting cylinder 7, and the other end is fixedly connected to the piston plate 8. The piston plate 8 is driven to move in the air storage cavity 71 of the mounting cylinder 7 through the automatic telescopic cylinder. Or the driving assembly is set to include an air pump. The air pump is installed in the air storage cavity 71 of the mounting cylinder 7, and gas is pumped into the airbag 3 or the gas in the airbag 3 is sucked through the air pump. When the driving assembly does not need to drive the piston plate 8 to move by means of the rotation of the mounting seat 6, the mounting seat 6 can also be fixedly installed in the box body 1, and the mounting box 12 is rotatably connected in the box body 1. By driving the mounting box 12 to rotate, the air outlet pipe 51 can be aligned with each heat exchange cylinder 2.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A waste heat recovery device for heating, ventilation and air conditioning, comprising a box body, a water guiding unit, a ventilation unit and a heat exchange unit arranged in the box body, characterized in that, The heat exchange unit includes a plurality of heat exchange cylinders arranged in the box body. A first valve and a second valve are arranged on the heat exchange cylinder. An air bag is arranged in the heat exchange cylinder, and the air bag is connected with a driving assembly for expanding or contracting it. The water guiding unit includes a spiral coiled pipe arranged in the heat exchange cylinder. The air venting unit is used to sequentially introduce gas into the heat exchange cylinder. When the gas is introduced, the first valve and the second valve are opened. When the gas supply stops, the first valve and the second valve are closed, and the driving assembly drives the air bag to expand and contract repeatedly.

2. The HVAC waste heat recovery device according to claim 1, wherein, An installation cylinder is fixedly connected to the lower part of each heat exchange cylinder. A gas storage cavity is arranged in the installation cylinder. A communication pipe for communicating the gas storage cavity and the inside of the air bag is arranged in the air bag. The driving assembly includes a driving member and a piston assembly slidably arranged in the gas storage cavity. The driving member drives the piston assembly to move along the gas storage cavity, and the gas in the gas storage cavity and the air bag moves along the communication pipe.

3. The HVAC waste heat recovery device according to claim 2, characterized in that, The piston assembly includes a piston plate, a first lead screw and a second lead screw fixedly connected to the piston plate. A first rotating cylinder threadedly engaged with the first lead screw and a second rotating cylinder threadedly engaged with the second lead screw are rotatably connected to the installation cylinder. The driving member includes a first gear fixedly connected to the first rotating cylinder, a second gear fixedly connected to the second rotating cylinder, and a driving structure for driving the first gear and the second gear to rotate. When the driving structure drives the first gear to rotate, the first gear drives the first lead screw through the first rotating cylinder to drive the piston plate to compress the space in the gas storage cavity, so that the air bag is inflated. When the driving structure drives the second gear to rotate, the second gear drives the second lead screw through the second rotating cylinder to drive the piston plate to suck the gas in the air bag, so that the air bag retracts.

4. The HVAC waste heat recovery device according to claim 3, characterized in that, The radial cross-section of the box body is circular. A coaxially arranged mounting seat is rotatably connected in the box body. The installation cylinder is fixedly installed on the mounting seat and is evenly distributed at intervals around the central axis of the mounting seat. The air venting unit includes an air inlet pipe communicated with the outside and an air outlet pipe located in the box body. A driving mechanism for driving the mounting seat to drive the installation cylinder and the heat exchange cylinder to rotate is arranged on the box body. When the heat exchange cylinder is aligned with the air outlet pipe, the driving mechanism pauses driving.

5. The HVAC waste heat recovery device according to claim 4, wherein, The driving structure includes a toothed ring rotatably connected to the outer periphery of the installation cylinder and a toothed ring arranged on the inner wall of the box body. The toothed ring is engaged with the toothed ring. A ring groove is formed on the side of the toothed ring facing the installation cylinder. A plurality of tooth segments are respectively arranged on the upper and lower groove walls of the ring groove, and the tooth segments are distributed at intervals around the central axis of the toothed ring. When the mounting seat drives the installation cylinder to rotate, the toothed ring rotates along the toothed ring, and the tooth segments on the upper groove wall of the ring groove drive the first gear to rotate, and the tooth segments on the lower groove wall of the ring groove drive the second gear to rotate.

6. The HVAC waste heat recovery device according to claim 4, characterized in that, The driving mechanism includes a motor fixedly installed on the box body and a driving gear fixedly connected to the output end of the motor. The mounting seat is fixedly connected with a support rod arranged coaxially. The support rod is fixedly connected with a driven gear meshing with the driving gear. The motor drives the driving gear to drive the driven gear and the support rod to rotate, and the support rod drives the mounting seat to rotate.

7. The HVAC waste heat recovery device according to claim 4, characterized in that, An installation box communicated with the intake pipe is arranged in the box body. The outlet pipe is communicated with the installation box and is slidably matched with the installation box in the vertical direction. An automatic telescopic rod for driving the outlet pipe to move vertically is arranged on the installation box.

8. The HVAC waste heat recovery device according to claim 4, characterized in that, The water guiding unit further includes a water inlet pipe and a water outlet pipe. The water inlet pipe penetrates through the bottom of the box body and is fixedly connected with the mounting seat. The spiral coils in each heat exchange cylinder are communicated with the water inlet pipe. A water storage cavity is formed between the mounting seat and the bottom of the box body. The water outlet pipe is located in the heat exchange cylinder and is communicated with the corresponding spiral coil. The water outlet pipe penetrates through the installation cylinder and the mounting seat and extends into the water storage cavity. A drain pipe communicating the water storage cavity and the external environment is arranged at the bottom of the box body.

9. The HVAC waste heat recovery device according to claim 4, characterized in that, The mounting seat is rotationally matched with the bottom of the box body through a thrust bearing.

10. The HVAC waste heat recovery device according to claim 5, wherein, Four air bags are arranged in each heat exchange cylinder, and four air storage cavities are correspondingly arranged in the installation cylinder. The communication pipes in each air bag are communicated with the corresponding air storage cavities.

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