A heating and plumbing duct cleaning device

Abstract

The present application relates to the technical field of pipeline cleaning, in particular to a heating and ventilation pipeline cleaning device, which comprises a moving cylinder and a cleaning cylinder arranged coaxially, the cleaning cylinder is rotatably assembled on the moving cylinder through a rotating mechanism, a plurality of moving mechanisms are arranged in the circumferential direction of the moving cylinder, the moving mechanisms are movably assembled on the moving cylinder along the radial direction of the moving cylinder and are used for sliding contact with the inner wall of the heating and ventilation pipeline; a plurality of scraper cleaning mechanisms and water spraying mechanisms are arranged in the circumferential direction of the cleaning cylinder, the scraper cleaning mechanisms are movably assembled on the cleaning cylinder along the radial direction of the cleaning cylinder and are used for rotating and scraping off impurities on the inner wall of the heating and ventilation pipeline, and the water spraying mechanisms are used for spraying high-pressure water on the inner wall of the heating and ventilation pipeline. The present application has two cleaning modes and can clean heating and ventilation pipelines with different diameters, so it has good versatility.

Description

Technical Field

[0001] This invention relates to the field of pipe cleaning technology, and specifically to a heating, ventilation, and air conditioning (HVAC) pipe cleaning device. Background Technology

[0002] After prolonged use, HVAC pipes will accumulate a large amount of scale. Scale has poor thermal conductivity. If the scale inside the HVAC pipes is too thick, it will reduce the efficiency of the HVAC pipes, and in severe cases, it may cause the HVAC pipes to burst or even explode.

[0003] Chinese utility model patent application number 202021848050.2 discloses a scale removal device for HVAC pipes, which includes a pipe, a drive box, a cleaning plate, and a rotary motor. The drive box is set inside the pipe, and the drive motor is fixedly installed on the side wall of the inner cavity of the drive box. A connecting rod is fixedly installed on the output end of the drive motor, and a roller is fixedly installed on one end of the connecting rod. The cleaning plate is fixedly installed on the left side wall of the drive box. This patent facilitates comprehensive cleaning of scale in HVAC pipes, is easy to operate, and reduces the cleaning difficulty for workers. Through the collection box and cleaning plate, scale can be discharged in time after cleaning, preventing scale from falling into the pipe and causing blockage, thus improving the cleaning effect of the device.

[0004] However, the existing technology has its shortcomings: although it can clean the scale on the inner wall of the pipe, the cleaning method is relatively simple and it is not suitable for cleaning pipes with different inner diameters, so its application range is narrow. Therefore, it is necessary to provide a heating and ventilation pipe cleaning device to solve the above technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a heating, ventilation, and air conditioning (HVAC) duct cleaning device to solve the technical problems of existing HVAC duct cleaning devices having a single cleaning method and a limited scope of application.

[0006] To solve the above problems, the present invention provides a heating, ventilation, and air conditioning (HVAC) duct cleaning device with the following technical solution: A heating, ventilation, and air conditioning (HVAC) duct cleaning device is characterized by comprising a coaxially arranged movable cylinder and a cleaning cylinder. The cleaning cylinder is rotatably mounted on the movable cylinder via a rotating mechanism. Multiple sets of moving mechanisms are provided in the circumferential direction of the movable cylinder, and the moving mechanisms are movably mounted on the movable cylinder in the radial direction for sliding contact with the inner wall of the HVAC duct. Multiple sets of scraper cleaning mechanisms and water spraying mechanisms are provided in the circumferential direction of the cleaning cylinder. The scraper cleaning mechanisms are movably mounted on the cleaning cylinder in the radial direction for rotating and scraping off impurities on the inner wall of the HVAC duct. The water spraying mechanisms are used to spray high-pressure water onto the inner wall of the HVAC duct.

[0007] Furthermore, the rotating mechanism includes a rotating shaft rotatably mounted on the moving cylinder and a turntable coaxially connected to the end of the moving cylinder. The rotating shaft passes through the turntable and is fixedly connected to the cleaning cylinder. A pulley groove is formed around the circumference of the turntable. Multiple pulley frames are circumferentially distributed on the inner wall of the cleaning cylinder at positions corresponding to the pulley groove. The ends of the pulley frames are rotatably mounted with pulleys that slide in cooperation with the pulley groove.

[0008] Furthermore, the moving mechanism includes a first moving plate, a traveling wheel, a fixed sleeve, a sliding column, and a first spring. The first moving plate is provided with a plurality of fixed sleeves arranged at intervals along the axial direction of the moving cylinder. A sliding column is slidably assembled in each fixed sleeve. The traveling wheel is rotatably assembled on the sliding column in a corresponding manner. The first spring is disposed between the traveling wheel and the first moving plate and is sleeved on the corresponding sliding column. The moving cylinder is provided with a first driving mechanism for driving the first moving plate to move.

[0009] Furthermore, the movable cylinder has a separated power chamber and a drive chamber. The power chamber is equipped with a first motor that is connected to the rotating shaft for transmission. The first drive mechanism is located in the drive chamber and includes a first rotating cylinder. The first rotating cylinder has two first external threaded sections arranged at left and right intervals. The threads of the two first external threaded sections have opposite directions. Each first external threaded section is threadedly connected to a first movable disk. Each first movable disk is hinged to a first connecting rod corresponding to the number of moving mechanisms. The first connecting rod is hinged to the first movable plate. The power chamber is equipped with a second motor for driving the first rotating cylinder to rotate.

[0010] Furthermore, the scraper cleaning mechanism includes a second movable plate, a scraper frame, a fixed plate, a slide rod, a second spring, and a scraper body. The scraper frame is connected to the second movable plate, the fixed plate is connected to the scraper frame, the scraper body is connected to the end of the slide rod, the slide rod slides in cooperation with the fixed plate, and the second spring is disposed between the scraper body and the fixed plate and sleeved on the slide rod.

[0011] Furthermore, retractable protective covers are provided between the first moving plate and the moving cylinder, and between the second moving plate and the cleaning cylinder.

[0012] Furthermore, a second rotating cylinder is rotatably assembled inside the cleaning cylinder. One end of the second rotating cylinder passes through the rotating shaft and extends into the power chamber. The second rotating cylinder has two second external threaded sections arranged at left and right intervals. The threads of the two second external threaded sections are opposite in direction. Each second external threaded section is threadedly connected to a second movable disk. A second connecting rod corresponding to the number of scraper cleaning mechanisms is hinged on the second movable disk. The second connecting rod is hinged to the second movable plate.

[0013] Furthermore, the power chamber is equipped with a clutch mechanism, which includes a first transmission plate, a second transmission plate, and an electric push rod. The first transmission plate is coaxially fixed on the first rotating cylinder, the second transmission plate is coaxially fixed on the second rotating cylinder, and the electric push rod is fixed on the first transmission plate. The telescopic end of the electric push rod is connected to a positioning post, and the second transmission plate is connected to a positioning groove that engages with the positioning post. After the positioning post and the positioning groove are engaged, the first rotating cylinder and the second rotating cylinder can rotate synchronously.

[0014] Furthermore, both the positioning groove and the positioning post are tapered variable diameter structures.

[0015] Furthermore, the water spraying mechanism includes a first water supply pipe, a second water supply pipe, and a connecting pipe. The first water supply pipe is fixedly installed inside the first rotating cylinder, and its inlet is used to connect to a water supply device. The second water supply pipe is fixedly installed inside the second rotating cylinder. The connecting pipe is located inside the power chamber and its two ends are connected to the first and second water supply pipes respectively through rotary joints. A water spraying plate is coaxially connected to the second rotating cylinder inside the cleaning cylinder. The outlet end of the second water supply pipe is connected to the water spraying plate. A water spraying pipe extending to the outside of the cleaning cylinder is connected to the water spraying plate. The water spraying pipe is fixedly connected to the water spraying frame on the second movable plate, and a high-pressure nozzle is installed on the water spraying pipe.

[0016] The beneficial effects of this invention are: This invention can remove impurities from the inner wall of HVAC pipes through a scraper cleaning structure, and can also flush HVAC pipes by spraying high-pressure water towards the inner wall of the HVAC pipes through a water spraying mechanism, providing a variety of cleaning methods. Furthermore, the scraper cleaning mechanism can move radially along the cleaning cylinder, and the moving mechanism can move radially along the moving cylinder, making the entire cleaning device applicable to HVAC pipes of various diameters, with strong versatility. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is an exploded structural diagram of the rotating mechanism in this invention; Figure 4 This is a cross-sectional structural diagram of the rotating mechanism in this invention; Figure 5 This is a schematic diagram of the front cross-sectional structure of the movable cylinder in this invention; Figure 6This is a side cross-sectional view of the movable cylinder in this invention. Figure 7 This is a schematic diagram of the main cross-sectional structure of the cleaning cylinder in this invention; Figure 8 This is a side cross-sectional view of the cleaning cylinder in this invention. Figure 9 This is a schematic diagram of the three-dimensional structure of the scraper body in this invention; In the diagram: 1. Moving cylinder; 2. Cleaning cylinder; 3. Rotating mechanism; 31. Rotating shaft; 32. Turntable; 33. Pulley groove; 34. Pulley frame; 35. Pulley; 4. Moving mechanism; 41. First rotating cylinder; 42. First moving disc; 43. First moving plate; 44. First connecting rod; 45. Fixed sleeve; 46. Sliding column; 47. Traveling wheel; 48. First spring; 5. Scraper cleaning mechanism; 51. Second rotating cylinder; 52. Second moving disc; 53. Second moving plate. 54. Plate; 55. Second connecting rod; 56. Scraper frame; 57. Scraper body; 58. Fixing plate; 59. Slide rod; 60. Second spring; 61. Water spraying mechanism; 62. First water supply pipe; 63. Second water supply pipe; 64. Connecting pipe; 65. Water spraying disc; 66. Water spraying pipe; 67. Water spraying frame; 78. High-pressure nozzle; 79. Clutch mechanism; 70. First transmission plate; 71. Second transmission plate; 72. Electric push rod; 73. Positioning column; 74. Positioning groove; 8. Protective cover. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0020] An embodiment of a heating, ventilation, and air conditioning (HVAC) duct cleaning device provided by the present invention: like Figure 1 As shown, a heating, ventilation and air conditioning (HVAC) duct cleaning device includes a movable cylinder 1, a cleaning cylinder 2, a moving mechanism 4 disposed on the movable cylinder 1, a scraper cleaning mechanism 5 disposed on the cleaning cylinder 2, and a water spraying mechanism 6.

[0021] In this embodiment, as Figure 1As shown, there are three sets of moving mechanisms 4, located on the outside of the moving cylinder 1. These three sets of moving mechanisms 4 are evenly distributed around the circumference of the moving cylinder 1 and are radially mounted on it for sliding contact with the inner wall of the HVAC duct. There are also three sets of scraper cleaning mechanisms 5, evenly distributed around the circumference of the cleaning cylinder 2. These scraper cleaning mechanisms 5 are radially mounted on the cleaning cylinder 2 for rotating and scraping away impurities from the inner wall of the HVAC duct. The water spraying mechanism 6 is used to spray high-pressure water onto the inner wall of the HVAC duct.

[0022] Specifically, such as Figure 2 and Figure 3 As shown, the movable cylinder 1 is equipped with a power chamber and a drive chamber. The cleaning cylinder 2 is rotatably assembled with the movable cylinder 1 via a rotating mechanism 3. The rotating mechanism 3 includes a rotating shaft 31 rotatably mounted on the movable cylinder 1 and a turntable 32 coaxially connected to the end of the movable cylinder 1. Multiple sets of evenly distributed pulley frames 34 are fixedly connected to the circumference of the cleaning cylinder 2, and pulleys 35 are rotatably connected to the ends of the pulley frames 34. The turntable 32 is provided with a ring of pulley grooves 33, and the pulleys 35 are located in the pulley grooves 33 on the turntable 32 and can slide within the pulley grooves 33, ensuring the stability of the cleaning cylinder during rotation. A first motor is installed in the power chamber and driven by the rotating shaft 31.

[0023] like Figure 5 and Figure 6 As shown, the moving mechanism 4 includes a first moving plate 43 and a traveling wheel 47. A fixed sleeve 45 is fixedly connected to the first moving plate 43, and a sliding column 46 is slidably connected inside the fixed sleeve 45. The traveling wheel 47 is mounted on the sliding column 46, and a first spring 48 is provided between the traveling wheel 47 and the first moving plate 43. A first rotating cylinder 41 is also rotatably connected inside the drive cavity. The first rotating cylinder 41 has two first external threaded sections arranged at left and right intervals, with opposite thread directions. Each first external threaded section is threadedly connected to a first moving disk 42. A first connecting rod 44 is hinged to each of the two first moving disks 42, and the other end of each first connecting rod 44 is hinged to the first moving plate 43. A second motor for driving the first rotating cylinder 41 to rotate is provided inside the power cavity. As the first rotating cylinder 41 rotates and drives the first moving discs 42 on the left and right sides to move closer to each other, the first moving plate 43 on the outer side of the moving cylinder 1 moves outward at the same time until the outer edge of the traveling wheel 47 is in contact with the inner wall of the HVAC pipe to be cleaned, thereby completing the support of the moving cylinder 1 under the action of the outer traveling wheel 47.

[0024] like Figure 7 , Figure 8 and Figure 9 As shown, the scraper cleaning mechanism 5 includes a second movable plate 53 and a scraper body 56. A scraper frame 55 is fixedly connected to the second movable plate 53, such as... Figure 9As shown, a fixing plate 57 is fixedly connected to the top of the scraper frame 55, and a scraper body 56 is slidably connected to the right side of the fixing plate 57. A slide rod 58 is fixedly connected to the scraper body 56. The slide rod 58 is a U-shaped rod, and both ends of the slide rod 58 pass through the fixing plate 57 and slide in cooperation with the fixing plate 57. A second spring 59 is provided between the scraper body 56 and the fixing plate 57 and is sleeved on the slide rod 58.

[0025] like Figure 7 and Figure 8 As shown, a second rotating cylinder 51 is installed inside the cleaning cylinder 2. One end of the second rotating cylinder 51 passes through the rotating shaft 31 and extends into the power chamber. The second rotating cylinder 51 has two second external threaded sections arranged at left and right intervals, with opposite thread directions. Each second external threaded section is threadedly connected to a second movable disk 52, and a second connecting rod 54 is hinged to the second movable disk 52. As the second rotating cylinder 51 rotates and drives the second movable disks 52 on both sides to move closer to each other, the second movable plate 53 moves away from the cleaning cylinder 2 until the scraper body 56 on the second movable plate 53 comes into contact with the inner wall of the HVAC pipe to be cleaned. Thus, as the cleaning cylinder 2 rotates, the scraper body 56 cleans the dirt on the inner wall of the HVAC pipe.

[0026] like Figure 4 As shown, a clutch mechanism 7 is installed in the power chamber to make the second rotating cylinder 51 rotate following the first rotating cylinder 41. The clutch mechanism 7 includes a first transmission plate 72, a second transmission plate 73, and an electric push rod 74. The first transmission plate 72 is fixed to the first rotating cylinder 41, the second transmission plate 73 is fixed to the second rotating cylinder 51, and the electric push rod 74 is fixed to the first transmission plate 72. A positioning post 75 is fixedly connected to the telescopic end of the electric push rod 74, and a positioning groove 76 is provided on the second transmission plate 73 to cooperate with the positioning post 75. Both the positioning post 75 and the positioning groove 76 are tapered variable diameter structures. When the positioning post 75 is inserted into the positioning groove 76 on the second transmission plate 73, the second rotating cylinder 51 rotates with the first rotating cylinder 41. When the positioning post 75 is not inserted into the positioning groove 76, the second rotating cylinder 51 is prevented from driving the first rotating cylinder 41 to rotate during the rotation of the cleaning cylinder 2.

[0027] In this embodiment, by adjusting the number of rotations of the first rotating cylinder 41 and the second rotating cylinder 51, the distance between the two first moving discs 42 and the distance between the two second moving discs 52 can be adjusted respectively, thereby adjusting the radial travel of the first moving plate 43 relative to the moving cylinder 1 and the travel of the second moving plate 53 relative to the cleaning cylinder 2, so that the traveling wheel 47 and the scraper body 56 can fit against the inner wall of HVAC pipes of different diameters.

[0028] The water spraying mechanism 6 includes a first water supply pipe 61, a second water supply pipe 62, and a connecting pipe 63. The first water supply pipe 61 is fixedly installed inside the first rotating cylinder 41, and its inlet end is connected to the water supply equipment via a rotary joint. The second water supply pipe 62 is fixedly installed inside the second rotating cylinder 51. The connecting pipe 63 is located inside the power chamber, with one end connected to the first water supply pipe 61 via a rotary joint, and the other end connected to the second water supply pipe 62 via a rotary joint. A water spraying disc 64 is coaxially connected to the second rotating cylinder 51 at the left end of the cleaning cylinder 2. The outlet end of the second water supply pipe 62 extends into the water spraying disc 64, and a water spraying pipe 65 extending to the outside of the cleaning cylinder 2 is connected to the water spraying disc 64. The water spraying pipe 65 is fixedly connected to a water spraying frame 66 on the second moving plate 53, and a high-pressure nozzle 67 is installed on the water spraying pipe 65.

[0029] Protective covers 8 are provided between the first moving plate 43 and the moving cylinder 1, and between the second moving plate 53 and the cleaning cylinder 2, to prevent impurities from entering the moving cylinder 1 and the cleaning cylinder 2.

[0030] The working principle of this invention is as follows: Before use, the inner wall of the end of the HVAC pipe needs to be cleaned manually with the help of tools. After cleaning, the HVAC pipe cleaning device of this application is placed inside the HVAC pipe. The HVAC pipe cleaning device is moved inside the HVAC pipe by the set traction or pushing device, and the cleaning of the inner wall of the HVAC pipe is completed during the movement.

[0031] Adjust the device to fit against the inner wall of the pipe. Through the control system, start the electric push rod 74 on the first transfer plate 72, so that the positioning post 75 on the telescopic end of the electric push rod 74 moves towards the second transfer plate 73 until the positioning post 75 is inserted into the positioning groove 76. At this time, start the second motor, so that the first rotating cylinder 41 rotates and drives the second rotating cylinder 51 to rotate. The two first moving discs 42 on the first rotating cylinder 41 move closer together, so that all the first moving plates 43 on the moving cylinder 1 move outwards at the same time until the traveling wheel 47 fits against the inner wall of the HVAC pipe. At the same time, the two second moving discs 52 on the cleaning cylinder 2 move closer together, so that all the second moving plates 53 outside the cleaning cylinder 2 move outwards at the same time until the scraper body 56 fits against the inner wall of the pipe. Then, the electric push rod 74 is reset, the second motor stops working, and the first motor is started, so that the rotating shaft 31 drives the cleaning cylinder 2 to rotate on the moving cylinder 1. During the rotation of the cleaning cylinder 2, the second moving plate 53, the second connecting rod 54, the second moving disk 52, and the second rotating cylinder 51 rotate relative to the moving cylinder 1. Since the positioning column 75 is disengaged from the positioning groove 76, the first rotating cylinder 41 will not follow the rotation of the second rotating cylinder 51, thus ensuring that the scraper body 56 and the traveling wheel 47 are in contact with the inner wall of the HVAC pipe. Start the water supply equipment so that the cleaning water enters the spray plate 64 through the first water supply pipe 61, the connecting pipe 63, and the second water supply pipe 62. The spray plate 64 then sends water into each spray pipe 65 so that the high-pressure nozzles 67 can flush the inner wall of the pipe. In addition, the inner wall of the pipe can be cleaned in all directions during the rotation of the cleaning cylinder 2.

[0032] This invention can clean the inner wall of HVAC pipes through both high-pressure flushing and scraper cleaning, and it is adaptable to HVAC pipes of different diameters, making it highly versatile.

[0033] In other embodiments, the first rotating cylinder and the second rotating cylinder can be controlled to rotate by separate motors.

[0034] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "horizontal," "vertical," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heating, ventilation, and air conditioning (HVAC) duct cleaning device, characterized in that, It includes a coaxially arranged moving cylinder and a cleaning cylinder. The cleaning cylinder is rotatably mounted on the moving cylinder via a rotating mechanism. Multiple moving mechanisms are provided in the circumferential direction of the moving cylinder. The moving mechanisms are movably mounted on the moving cylinder in the radial direction for sliding contact with the inner wall of the HVAC duct. Multiple scraper cleaning mechanisms and water spraying mechanisms are provided in the circumferential direction of the cleaning cylinder. The scraper cleaning mechanisms are movably mounted on the cleaning cylinder in the radial direction for rotating and scraping off impurities on the inner wall of the HVAC duct. The water spraying mechanisms are used to spray high-pressure water onto the inner wall of the HVAC duct. The rotating mechanism includes a rotating shaft rotatably mounted on the moving cylinder and a turntable coaxially connected to the end of the moving cylinder; the moving mechanism includes a first moving plate, and a first driving mechanism for driving the first moving plate to move is provided inside the moving cylinder; the scraper cleaning mechanism includes a second moving plate. The movable cylinder has a separated power chamber and a drive chamber. The power chamber is equipped with a first motor that is connected to the rotating shaft. The first drive mechanism is located in the drive chamber and includes a first rotating cylinder. The first rotating cylinder has two first external threaded sections arranged at left and right intervals. The threads of the two first external threaded sections have opposite directions. Each first external threaded section is threadedly connected to a first movable disk. Each first movable disk is hinged to a first connecting rod corresponding to the number of movable mechanisms. The first connecting rod is hinged to the first movable plate. The power chamber is equipped with a second motor for driving the first rotating cylinder to rotate. A second rotating cylinder is rotatably mounted inside the cleaning cylinder. One end of the second rotating cylinder passes through the rotating shaft and extends into the power chamber. The second rotating cylinder has two second external threaded sections arranged at left and right intervals. The threads of the two second external threaded sections are opposite in direction. Each second external threaded section is threadedly connected to a second movable disk. A second connecting rod corresponding to the number of scraper cleaning mechanisms is hinged on the second movable disk. The second connecting rod is hinged to the second movable plate. The power chamber is equipped with a clutch mechanism, which includes a first transmission plate, a second transmission plate, and an electric push rod. The first transmission plate is coaxially fixed on the first rotating cylinder, the second transmission plate is coaxially fixed on the second rotating cylinder, and the electric push rod is fixed on the first transmission plate. The telescopic end of the electric push rod is connected to a positioning post, and the second transmission plate is connected to a positioning groove that engages with the positioning post. After the positioning post and the positioning groove are engaged, the first rotating cylinder and the second rotating cylinder can rotate synchronously.

2. The HVAC duct cleaning device according to claim 1, characterized in that, The rotating shaft passes through the turntable and is fixedly connected to the cleaning cylinder; a pulley groove is opened in the circumferential direction of the turntable, and multiple pulley frames are circumferentially distributed on the inner wall of the cleaning cylinder corresponding to the position of the pulley groove. The ends of the pulley frames are rotatably fitted with pulleys that slide in cooperation with the pulley groove.

3. The HVAC duct cleaning device according to claim 1, characterized in that, The moving mechanism further includes a traveling wheel, a fixed sleeve, a sliding column, and a first spring. The first moving plate is provided with a plurality of fixed sleeves arranged at intervals along the axial direction of the moving cylinder. Each fixed sleeve is slidably fitted with a sliding column. The traveling wheel is rotatably fitted on the sliding column in a corresponding manner. The first spring is disposed between the traveling wheel and the first moving plate and is sleeved on the corresponding sliding column.

4. The HVAC duct cleaning device according to claim 1, characterized in that, The scraper cleaning mechanism further includes a scraper frame, a fixed plate, a slide bar, a second spring, and a scraper body. The scraper frame is connected to the second movable plate, the fixed plate is connected to the scraper frame, the scraper body is connected to the end of the slide bar, the slide bar slides in cooperation with the fixed plate, and the second spring is disposed between the scraper body and the fixed plate and sleeved on the slide bar.

5. A heating, ventilation, and air conditioning (HVAC) duct cleaning device according to claim 4, characterized in that, Retractable protective covers are installed between the first moving plate and the moving cylinder, and between the second moving plate and the cleaning cylinder.

6. A heating, ventilation, and air conditioning (HVAC) duct cleaning device according to claim 1, characterized in that, Both the positioning groove and the positioning column are tapered variable diameter structures.

7. A heating, ventilation, and air conditioning (HVAC) duct cleaning device according to claim 1, characterized in that, The water spraying mechanism includes a first water supply pipe, a second water supply pipe, and a connecting pipe. The first water supply pipe is fixedly installed inside the first rotating cylinder, and its inlet is used to connect to the water supply equipment. The second water supply pipe is fixedly installed inside the second rotating cylinder. The connecting pipe is located inside the power chamber and its two ends are connected to the first and second water supply pipes respectively through rotary joints. A water spraying plate is coaxially connected to the second rotating cylinder inside the cleaning cylinder. The outlet end of the second water supply pipe is connected to the water spraying plate. A water spraying pipe extending to the outside of the cleaning cylinder is connected to the water spraying plate. The water spraying pipe is fixedly connected to the water spraying frame on the second movable plate and is equipped with a high-pressure nozzle.

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