A smart terminal power distribution box

Abstract

This invention discloses an intelligent terminal power distribution box, relating to the field of distribution box technology. It includes a box body, side panels, a door, electrical beams, an adjustment unit, and a humidity detection unit. When the humidity detection unit detects water accumulation at the bottom of the box body, it triggers the adjustment unit, which in turn drives multiple electrical beams to move upwards. In this invention, the humidity detection unit detects water accumulation at the bottom of the box body, triggering the adjustment unit to drive multiple electrical beams upwards. This keeps the electrical components mounted on the beams away from the water accumulation at the bottom of the box, preventing moisture from easily entering the components. Furthermore, the upward movement of the multiple electrical beams varies sequentially, allowing all electrical components inside the box to be arranged compactly without requiring a large internal space, thus reducing the space occupied by the box. In other words, within the limited internal space of the box, all electrical components are arranged as compactly as possible to reduce moisture adhesion.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, specifically to an intelligent terminal power distribution box. Background Technology

[0002] Currently, power distribution boxes (or power distribution cabinets) used for smart terminal devices are usually placed directly on the ground. In addition, since power distribution boxes are usually designed to be explosion-proof, they often have explosion-proof pressure relief vents at the bottom. This means that if there is water on the ground, and the water is located below the explosion-proof pressure relief vent, the heat generated by the power distribution box during operation will cause the water to vaporize and produce moisture. After the moisture enters the power distribution box through the explosion-proof pressure relief vent, it will affect the electrical components installed inside the power distribution box. In severe cases, it may cause moisture condensation and short circuit, thus creating a significant safety hazard. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent terminal power distribution box to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A smart terminal power distribution box includes a box body, side panels, and a door, and further includes: Multiple electrical beams are installed sequentially from top to bottom inside the box; An adjustment unit is provided inside the box, which is used to drive multiple electrical beams to move upward, and the stroke of the multiple electrical beams to move upward decreases sequentially from top to bottom; The humidity detection unit installed on the lower side of the box triggers the adjustment unit when it detects water accumulation at the bottom of the box, thereby driving multiple electrical beams to move upward.

[0005] Furthermore, the adjustment unit includes a rotating support column vertically rotatably connected to the housing. The rotating support column has multiple threaded portions along its length. The pitch of the multiple threaded portions on the same rotating support column increases sequentially from top to bottom, and each threaded portion is fitted with a threaded sleeve. The two ends of the electrical beam along its length are respectively connected to the periphery of the two threaded sleeves corresponding to the two rotating support columns.

[0006] Furthermore, the humidity detection unit includes a cable tray connected to the bottom wall of the box, a bracket extending toward the bottom of the box connected to the outer wall of the cable tray, a humidity sensor installed on the lower side of the bracket, a motor installed on the cable tray, and the output shaft of the motor being drivenly connected to the two rotating support columns.

[0007] Furthermore, the motor output shaft is fixedly fitted with a driving synchronous pulley, and each of the two rotating support columns is fixedly fitted with a driven synchronous pulley. A synchronous belt is wound around the driving synchronous pulley and the two driven synchronous pulleys.

[0008] Furthermore, a ventilation opening is provided on one of the side panels of the housing, and a heat dissipation unit is installed inside the ventilation opening. A plurality of threaded sleeves adjacent to the ventilation opening are each provided with a ventilation unit. The ventilation units are correspondingly located below the electrical beam, and the heat dissipation unit is connected to the plurality of ventilation units.

[0009] Furthermore, the heat dissipation unit includes a mounting compartment installed at the vent. A filter screen is installed on the side of the mounting compartment that is exposed on the side plate. A motor bracket is installed inside the mounting compartment. A cooling fan is installed on the end face of the motor bracket. A closed compartment is installed on the other side of the mounting compartment. The closed compartment is open on the side facing the mounting compartment and communicates with the interior of the mounting compartment. A fixed pipe extending downward is fixedly connected to the periphery of the closed compartment. The lower end of the fixed pipe is closed and the upper end communicates with the inner cavity of the closed compartment.

[0010] Furthermore, the ventilation unit includes an ear block fixed to the periphery of the threaded sleeve, a connecting pipe fixedly inserted through the ear block, the upper end of the connecting pipe communicating with the interior of the fixed pipe through a flexible hose, a ventilation pipe extending towards the end of the electrical beam horizontally fixed to the lower end of the connecting pipe, the end of the ventilation pipe away from the connecting pipe being closed and the other end communicating with the lower opening of the connecting pipe, and a plurality of upward-facing air extraction ports provided around the periphery of the ventilation pipe along the length direction of the electrical beam, the air extraction ports communicating with the interior of the ventilation pipe.

[0011] Furthermore, a hollow ring frame is coaxially engaged inside the ventilation duct, the hollow ring frame slides freely inside the ventilation duct, an arc-shaped baffle is fixed to the end face of the hollow ring frame, and an adjustment unit is provided on the ventilation duct for driving the arc-shaped baffle to move.

[0012] Furthermore, the adjustment unit includes an adjustment rod coaxially passing through the ventilation pipe, the hollow ring frame being coaxially and fixedly sleeved on the part of the adjustment rod located inside the ventilation pipe, a ball bearing being rotatably embedded at one end of the adjustment rod extending out of the ventilation pipe, and a wedge block cooperating with the ball bearing being fixedly connected to the inner wall of the side plate.

[0013] Furthermore, a spring is horizontally installed at the end of the ventilation duct cavity away from the connecting pipe, and the spring elastically abuts against an adjacent hollow ring frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, when the humidity detection unit detects water accumulation at the bottom of the box, it triggers the adjustment unit to move upward, thereby moving multiple electrical beams away from the water accumulation at the bottom of the box. This prevents moisture from easily entering the electrical components. Furthermore, the upward movement of the multiple electrical beams varies sequentially. The bottom electrical beam typically houses smaller electrical components, so its upward movement is the longest. The top electrical beam typically houses larger electrical components, so its movement is relatively short. This allows all electrical components inside the box to be arranged compactly without requiring a large internal space, thus reducing the space occupied by the box. In other words, within the limited space inside the box, all electrical components are arranged compactly to reduce moisture adhesion. 2. In this invention, by screwing the threaded sleeve onto the threaded part and setting the pitch of multiple threaded parts on the same rotating support column to increase sequentially from top to bottom, the travel of the threaded sleeve changes sequentially when the rotating support column rotates, thereby enabling the compact arrangement of all electrical components within the limited space inside the housing. The structure is simple and the cost is low. 3. In this invention, the cooling fan rotates, enabling the fixed pipe, connecting pipe, ventilation pipe, and exhaust port to exhaust and cool the electrical components installed on the electrical beam. Compared to the prior art, since the exhaust port is directly located below the electrical beam, it can quickly remove moisture and heat from the vicinity of the electrical beam. In addition, an adjustment unit is provided so that the opening of the exhaust port increases from top to bottom, thereby achieving rapid removal of moisture from the vicinity of the electrical beam inside the box without changing the power of the cooling fan. The lower the exhaust port, the larger the opening, resulting in better moisture removal, following the principle that moisture is heavier than air and tends to accumulate at the bottom. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a smart terminal power distribution box according to the present invention; Figure 2 for Figure 1 A structural diagram of the box with the door omitted in the middle; Figure 3 for Figure 2 A schematic diagram of the structure after omitting the side plates; Figure 4 for Figure 3 A structural diagram from another perspective; Figure 5 This is a schematic diagram showing the positional relationship of the electrical beam, installation compartment, and ventilation pipe after assembly in this invention; Figure 6 for Figure 5 Schematic diagram of the explosive decomposition of the medium structure; Figure 7 This is a schematic diagram showing the positional relationship of the ventilation pipe and the connecting pipe after assembly in this invention; Figure 8 for Figure 7 A schematic diagram showing the positional relationship of the middle section after it has been cut open; Figure 9 for Figure 8 Enlarged schematic diagram of the local structure at point A; Figure 10 for Figure 7 Schematic diagram of the explosive decomposition of the medium structure; Figure 11 This is a schematic diagram showing the positional relationship of the adjusting rod, the hollow ring frame, and the arc-shaped baffle after assembly in this invention. Figure 12 This is a schematic diagram showing the positional relationship between the hollow ring frame and the arc-shaped baffle after assembly in this invention.

[0016] The following are the annotations for each item in the attached diagram: 1. Housing; 2. Installation compartment; 3. Side panel; 4. Door; 5. Electrical beam; 6. Ventilation duct; 7. Cable tray; 8. Bracket; 9. Motor; 10. Synchronous belt; 11. Driven synchronous belt pulley; 12. Rotating support column; 13. Fixed pipe; 14. Flexible hose; 15. Threaded part; 16. Enclosed compartment; 17. Air extraction port; 18. Wedge block; 19. Connecting pipe; 20. Threaded sleeve; 21. Filter screen; 22. Driven synchronous belt pulley; 23. Ear block; 24. Motor bracket; 25. Cooling fan; 26. Adjusting rod; 27. Spring; 28. Arc-shaped baffle; 29. ​​Hollow ring frame; 30. Ball bearing; 31. Humidity sensor. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 - Figure 12This invention provides a technical solution: an intelligent terminal power distribution box, including a box body 1, two side panels 3 and a door 4. The bottom of the box body 1 is provided with an explosion-proof pressure relief port. Three electrical beams 5 are arranged inside the box body 1 from top to bottom. In addition, the bottom wall and top wall of the box body 1 are vertically rotatably connected by bearings to two rotating support columns 12. The two rotating support columns 12 are located on opposite sides inside the box body 1. The rotating support columns 12 have three threaded parts 15 along their length direction. The pitch of the three threaded parts 15 on the same rotating support column 12 increases sequentially from top to bottom, and each threaded part 15 is fitted with a threaded sleeve 20. The two ends of the same electrical beam 5 along its length direction are respectively connected to the periphery of the two corresponding threaded sleeves 20 of the two rotating support columns 12 by screws. External electrical components are installed on the electrical beams 5. In the prior art, larger electrical components are usually installed on the electrical beams 5 located on the upper side, and smaller electrical components are installed on the electrical beams 5 located on the lower side. A cable tray 7 is screwed to the bottom wall of the inner wall of the enclosure 1. A bracket 8 extending towards the bottom of the enclosure 1 is connected to the outer wall of the cable tray 7. An explosion-proof pressure relief port extends from the lower end of the bracket 8, and a humidity sensor 31 is installed at the end of the bracket 8 that extends from the explosion-proof pressure relief port. The detection end of the humidity sensor 31 is in contact with the ground to ensure accurate contact and detection of water accumulation. In addition, the humidity sensor 31 is electrically connected to a control module (such as a PLC or microcontroller) installed in the enclosure 1 via a cable, so that the signal collected by the humidity sensor 31 is fed back to the control module. A motor 9 is installed on the cable tray 7, and the motor 9 is powered by a power module installed in the enclosure 1. The motor 9 is powered and the control module can control the start, stop, direction and speed of the motor 9. The output shaft of the motor 9 is fixedly sleeved with a driving synchronous pulley 22. The two rotating support columns 12 are each fixedly sleeved with a driven synchronous pulley 11. A synchronous belt 10 is wrapped around the driving synchronous pulley 22 and the two driven synchronous pulleys 11. The driving synchronous pulley 22 and the two driven synchronous pulleys 11 are arranged in a triangle. This allows the output shaft of the motor 9 to drive the driving synchronous pulley 22 to rotate, and through the synchronous belt 10, drive the two driven synchronous pulleys 11 to rotate synchronously in the same direction, which in turn drives the two rotating support columns 12 to rotate synchronously in the same direction. A ventilation opening is provided on one of the side panels 3 of the housing 1, and an installation compartment 2 with open sides is installed at the ventilation opening (e.g., Figure 6As shown), a filter screen 21 is installed at the opening of the side panel 3 of the installation compartment 2. The filter screen 21 is used to filter the air entering the housing 1. In addition, a motor bracket 24 is fixedly installed inside the installation compartment 2. A cooling fan 25 is installed on the end face of the motor bracket 24. The cooling fan 25 is powered by a power module. When the cooling fan 25 is powered on, it will generate airflow from inside the housing 1 to outside the housing 1, thereby cooling the inside of the housing 1. A closed compartment 16 is installed at the opening on the other side of the installation compartment 2. The sealed chamber 16 has an open side facing the installation chamber 2 and communicates with the interior of the installation chamber 2. A downwardly extending fixed tube 13 is fixedly connected to the periphery of the sealed chamber 16. The lower end of the fixed tube 13 is closed and the upper end communicates with the inner cavity of the sealed chamber 16. An ear block 23 is fixedly connected to the periphery of the threaded sleeve 20. A connecting tube 19 is fixedly inserted through the ear block 23. The upper end of the connecting tube 19 communicates with the interior of the fixed tube 13 through a flexible tube 14. This allows the fixed tube 13 to rotate when the rotating support column 12 rotates due to the bending of the flexible tube 14. In a static state, the connecting pipe 19 moves and remains connected to the interior of the fixed pipe 13. The lower end of the connecting pipe 19 is horizontally fixed to a ventilation pipe 6 extending towards the end of the electrical beam 5. One end of the ventilation pipe 6 away from the connecting pipe 19 is closed, and the other end is connected to the lower opening of the connecting pipe 19. Multiple upward-facing air extraction ports 17 are provided around the periphery of the ventilation pipe 6 along the length of the electrical beam 5. The air extraction ports 17 are connected to the interior of the ventilation pipe 6 and correspond to the electrical components installed on the electrical beam 5. When the cooling fan 25 is started, air flows through the sealed chamber 16, the fixed pipe 13, the flexible hose 14, the connecting pipe 19, and the ventilation pipe 6 in sequence, thereby generating suction on the air extraction ports 17. This causes the air and moisture near the electrical components to enter the ventilation pipe 6 through the air extraction ports 17 and finally be discharged from the filter screen 21. Since the air extraction ports 17 are directly located near the electrical components, they can quickly dissipate heat and dehumidify the electrical components and increase the airflow velocity at the opening of the air extraction ports 17, thereby improving the dehumidification efficiency. A hollow ring frame 29 is coaxially engaged inside the ventilation duct 6. The hollow ring frame 29 (e.g.) Figure 9 As shown, it slides freely inside the ventilation duct 6, and an arc-shaped baffle 28 is fixed to the end face of the hollow ring frame 29 (as shown). Figure 12As shown, when the hollow ring frame 29 slides inside the ventilation duct 6, the arc-shaped baffle 28 can adjust the size of the area blocked by the air intake 17, thereby adjusting the airflow velocity at the air intake 17 and thus adjusting the rate of moisture discharge. Since the moisture is greater near the electrical components on the lower side and relatively less near the electrical components on the upper side, in this embodiment, an adjusting rod 26 is coaxially inserted into the ventilation duct 6, and the hollow ring frame 29 is coaxially and fixedly sleeved on the adjusting rod 26. Inside the ventilation duct 6, the end of the adjusting rod 26 that protrudes from the ventilation duct 6 is rotatably fitted with a ball bearing 30. The inner wall of the side plate 3 is fixed with a wedge 18 that works with the ball bearing 30. The inclined surface of the wedge 18 faces the ball bearing 30 and works with the ball bearing 30. The tip of the wedge 18 near the top of the box 1 (or the uppermost one) is set downwards. A spring 27 is installed at the end of the ventilation duct 6 away from the connecting pipe 19. The spring 27 generates an elastic resisting force on a nearby hollow ring frame 29.

[0019] Working principle of the invention: When water accumulates at the bottom of the housing 1, the detection end of the humidity sensor 31 comes into contact with the water and generates a signal, which is then fed back to the control module. The control module controls the motor 9 to rotate. When the output shaft of the motor 9 rotates, it drives the active synchronous pulley 22 to rotate, and through the synchronous belt 10, it drives the two driven synchronous pulleys 11 to rotate synchronously in the same direction. This, in turn, drives the two rotating support columns 12 to rotate synchronously in the same direction, causing the threaded sleeve 20 to engage with the threaded portion 15 of the rotating support column 12, and causing the threaded sleeve 20 to move upward. In addition, since the pitch of the three threaded portions 15 on the same rotating support column 12 increases sequentially from top to bottom, this will cause the three... The movement stroke of the electrical beam 5 increases sequentially from top to bottom. That is, the upward movement of small electrical components is larger, while the upward movement of large electrical components is smaller. This allows the electrical components to be arranged as compactly as possible within the limited internal space of the box 1. Since the electrical components move upward, they will be away from the water accumulation at the bottom of the box 1. And since moisture tends to accumulate in the lower layer of air, the upward movement of the electrical components avoids the influence of moisture. When the signal of the humidity sensor 31 disappears, the control module controls the motor 9 to rotate in the opposite direction, thereby enabling the electrical components to reset. This increases the distance between the electrical components to avoid heat accumulation. Additionally, when the rotating support column 12 rotates, it will drive the connecting pipe 19 to move upward, thereby causing the ball bearing 30 to roll on the inclined surface of the wedge block 18. The ball bearing 30 on the two adjusting rods 26 on the lower side will roll from the highest point of the inclined surface of the wedge block 18 to the lowest point of the inclined surface. Driven by the elastic resisting force of the spring 27 on the hollow ring frame 29, the adjusting rod 26 will drive the hollow ring frame 29 to move towards the connecting pipe 19, thereby reducing the area of ​​the arc baffle 28 blocking the opening of the air extraction port 17, thereby increasing the opening width of the air extraction port 17. Furthermore, the final stopping positions of the two ball bearings 30 on the wedge block 18 are inconsistent, thereby making the opening width of the air extraction port 17 on the lowest ventilation pipe 6 greater than the opening width of the air extraction port 17 on the adjacent ventilation pipe 6. Conversely, the ball bearing 30 on the uppermost adjusting rod 26 will roll from the lowest point of the inclined plane of the wedge block 18 to the highest point. This causes the area of ​​the arc-shaped baffle 28 inside the ventilation pipe 6 connected to the threaded sleeve 20 that blocks the air intake 17 to increase as the threaded sleeve 20 moves upward. Consequently, the opening of the air intake 17 on the uppermost ventilation pipe 6 decreases. Since the large-volume electrical components installed on the uppermost electrical beam 5 often consume a lot of energy, under normal operating conditions, the opening of its corresponding air intake 17 is larger than that of others. The opening width of the exhaust port 17 on the ventilation duct 6 is adjusted according to the configuration of this embodiment. When dehumidifying, since there is less moisture above, a large airflow velocity is not required. Therefore, the opening width of the exhaust port 17 on the upper ventilation duct 6 is reduced. After the moisture is discharged and the electrical beam 5 moves down and resets, the opening width of the exhaust port 17 on the upper ventilation duct 6 needs to be increased, while the opening width of the exhaust ports 17 on other ventilation ducts 6 needs to be reduced. This is to balance the heat dissipation efficiency of electrical components without changing the power of the cooling fan 25.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A smart terminal power distribution box, comprising a box body (1), side panels (3), and a door (4), characterized in that, Also includes: Multiple electrical beams (5) are installed sequentially from top to bottom inside the housing (1); An adjustment unit is provided inside the housing (1). The adjustment unit is used to drive multiple electrical beams (5) to move upward, and the stroke of multiple electrical beams (5) moving upward decreases sequentially from top to bottom. The humidity detection unit installed on the lower side of the box (1) will trigger the adjustment unit to move when the humidity detection unit detects water accumulation at the bottom of the box (1), thereby driving multiple electrical beams (5) to move upward. The adjustment unit includes a rotating support column (12) that is vertically rotatably connected to the housing (1). The rotating support column (12) has multiple threaded parts (15) along its length. The multiple threaded parts (15) on the same rotating support column (12) have progressively increasing pitches from top to bottom. Each threaded part (15) is fitted with a threaded sleeve (20). The two ends of the electrical beam (5) along its length are respectively connected to the periphery of the two threaded sleeves (20) corresponding to the two rotating support columns (12).

2. The intelligent terminal power distribution box according to claim 1, characterized in that, The humidity detection unit includes a cable tray (7) connected to the bottom wall of the box (1), and a bracket (8) extending toward the bottom of the box (1) is connected to the outer wall of the cable tray (7). A humidity sensor (31) is installed on the lower side of the bracket (8). A motor (9) is installed on the cable tray (7), and the output shaft of the motor (9) is connected to the two rotating support columns (12) for transmission.

3. The intelligent terminal power distribution box according to claim 2, characterized in that, The output shaft of the motor (9) is fixedly fitted with a driving synchronous pulley (22), and each of the two rotating support columns (12) is fixedly fitted with a driven synchronous pulley (11). A synchronous belt (10) is wound around the driving synchronous pulley (22) and the two driven synchronous pulleys (11).

4. The intelligent terminal power distribution box according to claim 1, characterized in that, A ventilation opening is provided on one of the side plates (3) of the housing (1), and a heat dissipation unit is installed in the ventilation opening. A ventilation unit is provided on each of the multiple threaded sleeves (20) adjacent to the ventilation opening. The ventilation unit is correspondingly located below the electrical beam (5), and the heat dissipation unit is connected to the multiple ventilation units.

5. The intelligent terminal power distribution box according to claim 4, characterized in that, The heat dissipation unit includes an installation chamber (2) installed at the vent. A filter screen (21) is installed on the side of the installation chamber (2) that is exposed on the side plate (3). A motor bracket (24) is installed inside the installation chamber (2). A cooling fan (25) is installed on the end face of the motor bracket (24). A closed chamber (16) is installed on the other side of the installation chamber (2). The closed chamber (16) is open on the side facing the installation chamber (2) and communicates with the interior of the installation chamber (2). A fixed tube (13) extending downward is fixedly connected to the periphery of the closed chamber (16). The lower end of the fixed tube (13) is closed and the upper end communicates with the inner cavity of the closed chamber (16).

6. The intelligent terminal power distribution box according to claim 5, characterized in that, The ventilation unit includes an ear block (23) fixed to the periphery of the threaded sleeve (20). A connecting pipe (19) is fixedly inserted through the ear block (23). The upper end of the connecting pipe (19) is connected to the interior of the fixed pipe (13) through a flexible hose (14). A ventilation pipe (6) extending toward the end of the electrical beam (5) is horizontally fixed to the lower end of the connecting pipe (19). One end of the ventilation pipe (6) away from the connecting pipe (19) is closed and the other end is connected to the lower opening of the connecting pipe (19). A plurality of upward-facing air extraction ports (17) are provided around the periphery of the ventilation pipe (6) along the length direction of the electrical beam (5). The air extraction ports (17) are connected to the interior of the ventilation pipe (6).

7. The intelligent terminal power distribution box according to claim 6, characterized in that, A hollow ring frame (29) is coaxially engaged inside the ventilation pipe (6). The hollow ring frame (29) slides freely inside the ventilation pipe (6). An arc-shaped baffle (28) is fixed to the end face of the hollow ring frame (29). An adjustment mechanism for driving the arc-shaped baffle (28) to move is provided on the ventilation pipe (6).

8. The intelligent terminal power distribution box according to claim 7, characterized in that, The adjustment mechanism includes an adjustment rod (26) coaxially passing through the ventilation pipe (6), and a hollow ring frame (29) coaxially and fixedly sleeved on the part of the adjustment rod (26) located inside the ventilation pipe (6). A ball bearing (30) is rotatably embedded at one end of the adjustment rod (26) that passes through the ventilation pipe (6), and a wedge (18) that cooperates with the ball bearing (30) is fixedly connected to the inner wall of the side plate (3).

9. The intelligent terminal power distribution box according to claim 8, characterized in that, A spring (27) is horizontally installed at one end of the inner cavity of the ventilation pipe (6) away from the connecting pipe (19), and the spring (27) elastically abuts against an adjacent hollow ring frame (29).

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