Electric adjusting air outlet

Abstract

The utility model discloses an electric adjusting air outlet which comprises a shell and a bearing support, an air channel penetrates through the shell, a first blade is connected in the air channel, a second blade is connected in the air channel, a first reciprocating mechanism and a second reciprocating mechanism are arranged on the shell, the first reciprocating mechanism penetrates through the shell to be in contact with the first blade, and the second reciprocating mechanism penetrates through the shell to be in contact with the second blade. The bearing support is provided with a double-shaft motor, one output shaft of the double-shaft motor is fixedly connected with a first bevel gear, the bearing support is slidably connected with a second bevel gear, the bearing support is provided with a first electromagnet, the second bevel gear is connected with the first reciprocating mechanism, and the second reciprocating mechanism is connected with the second reciprocating mechanism. The other output shaft of the double-shaft motor is fixedly connected with a first face gear, and the first face gear is connected with the first reciprocating mechanism. The utility model provides an electric adjusting air outlet which can achieve the effect of automatic up-and-down air sweeping and left-and-right air sweeping, and the facing direction of the air outlet can be electrically controlled.

Description

Technical Field

[0001] The utility model relates to the field of automobile air-conditioning air outlets, in particular to an electrically adjustable air outlet. Background Art

[0002] Car air-conditioning vents refer to air conditioning devices installed in cars, which can adjust the direction and size of the air flow in the car, blow out cold air or hot air to adjust the temperature in the car to a suitable temperature, provide a comfortable riding environment for passengers, reduce driver fatigue, and improve driving safety. If necessary, you can even close the front or rear air-conditioning vents separately to meet the needs of passengers with different physiques.

[0003] However, the existing air outlet requires the passenger to manually control the air outlet direction of the air outlet, and the adjusted air outlet can only blow air in a fixed direction, making the air outlet single in function. Utility Model Content

[0004] The utility model aims to provide an electrically adjustable air outlet, which can realize the effects of automatically sweeping air up and down and left and right, and can electrically control the direction of the air outlet.

[0005] The technical solution adopted by the electric adjustable air outlet disclosed in the utility model is:

[0006] The invention comprises a shell and a supporting bracket, wherein an air duct is passed through the shell, and a plurality of first blades arranged at intervals are rotatably connected in the air duct, and a plurality of second blades arranged at intervals are rotatably connected in the air duct, and the first blade and the second blade are perpendicular to each other, and a first reciprocating mechanism and a second reciprocating mechanism are provided on the shell, and the first reciprocating mechanism passes through the shell and contacts the first blade, and the second reciprocating mechanism passes through the shell and contacts the second blade, and the supporting bracket is fixedly connected to the shell, and a dual-axis motor is provided on the supporting bracket, and a first helical gear is fixedly connected to one of the output shafts of the dual-axis motor, and a first helical gear is slidably connected to the supporting bracket. A second helical gear is connected, a first magnetic part is provided on the second helical gear, a first electromagnet is provided on the supporting bracket, the first electromagnet faces the first magnetic part, the second helical gear is connected to the first reciprocating mechanism, the first face gear is fixedly connected to the other output shaft of the dual-axis motor, a sliding rod is slidably connected to the supporting bracket, a second magnetic part is provided on the sliding rod, the supporting bracket is provided with a second electromagnet, the second electromagnet faces the second magnetic part, a second face gear is rotatably connected to the sliding rod, the second face gear faces the first face gear, and the second face gear is connected to the first reciprocating mechanism.

[0007] As a preferred solution, the first reciprocating mechanism includes a third bevel gear, a first rotating wheel and a first slide. The third bevel gear is rotatably connected to the supporting bracket. The third bevel gear is close to the second bevel gear. A coaxial first pulley extends from the third bevel gear. The first rotating wheel is rotatably connected to the supporting bracket. A coaxial second pulley extends from the first rotating wheel. A first transmission belt is provided on the first and second pulleys. The first slide passes through the outer shell and contacts the first blade. The first rotating wheel is slidably connected to the first slide.

[0008] As a preferred solution, a guide column extends from one side of the first rotating wheel, a first sliding groove is provided on the shell, the first slide is placed in the first sliding groove for sliding connection, a guide groove is provided on the first slide, the guide column is placed in the guide groove for sliding contact, a plurality of first notches arranged at intervals are provided on the first slide, and the first blade is located in the first notch.

[0009] As a preferred embodiment, the second reciprocating mechanism includes a second wheel and a second slide, the second wheel is rotatably connected to the outer shell, a coaxial third pulley extends from the second face gear, a second transmission belt is provided on the outer side of the second wheel and the third pulley, the second slide passes through the outer shell and contacts the second blade, and the second wheel is connected to the second slide.

[0010] As a preferred solution, a second sliding groove is provided on the shell, the second slide is placed in the second sliding groove for sliding connection, a plurality of second notches arranged at intervals are provided on the second slide, the second blade is located in the second notch, and the second reciprocating mechanism also includes a rocker arm, and the two ends of the rocker arm are respectively rotationally connected to the second slide and the second wheel.

[0011] As a preferred embodiment, a plurality of first through slots arranged at intervals are provided on both sides of the shell, a plurality of second through slots arranged at intervals are provided on the top and bottom of the shell, a first central axis extends on both sides of the first blade, the first central axis is placed in the adjacent first through slot, a second central axis extends on both sides of the second blade, the second central axis is placed in the adjacent second through slot.

[0012] As a preferred solution, it also includes a cover plate, which is provided with an air trough, and a plurality of clips extending from the cover plate, and a plurality of clip slots are provided on the outer side of the shell, the cover plate is covered on the shell, the air trough is connected to the air duct, and the clips are snapped into adjacent clip slots.

[0013] As a preferred solution, a plurality of first limit blocks arranged at intervals are extended from the cover plate, and a plurality of second limit blocks arranged at intervals are extended from the cover plate. The plurality of first limit blocks and the plurality of second limit blocks are arranged around the wind trough, the first limit blocks are inserted into the adjacent first through grooves, and the second limit blocks are inserted into the adjacent second through grooves.

[0014] The beneficial effects of the electrically adjustable air outlet disclosed in the utility model are:

[0015] A dual-axis motor drives the first reciprocating mechanism and the second reciprocating mechanism to operate simultaneously, so that the first reciprocating mechanism drives the first blade to swing back and forth, and the second reciprocating mechanism drives the second blade to swing back and forth, so that the cold air in the air duct can change the four blowing directions under the guidance of the first blade and the second blade.

[0016] By changing the N pole and S pole of the first electromagnet, the first electromagnet pushes or pulls the second bevel gear close to or away from the first bevel gear, disconnects or connects the cooperation between the first bevel gear and the second bevel gear, and allows the first blade to start or stop swinging, so that the air outlet can automatically sweep the air up and down or pause at a fixed angle for blowing air; by changing the N pole and S pole of the second electromagnet, the second electromagnet pushes or pulls the sliding rod, so that the second face gear approaches or moves away from the first face gear, disconnects or connects the cooperation between the first face gear and the second face gear, and allows the second blade to start or stop swinging, so that the air outlet can automatically sweep the air left and right or pause at a fixed angle for blowing air; the blowing mode of the air outlet is realized by electrically controlling the air outlet, making the air outlet more functional. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an electrically adjustable air outlet of the utility model.

[0018] Figure 2 This is a schematic diagram of the installation of a first blade and a second blade of an electrically adjustable air outlet of the utility model.

[0019] Figure 3 This is a structural schematic diagram of the first reciprocating mechanism of an electrically adjustable air outlet of the utility model.

[0020] Figure 4 This is a structural schematic diagram of the second reciprocating mechanism of an electrically adjustable air outlet of the utility model.

[0021] Figure 5 This is a schematic diagram of the structure of a supporting bracket of an electrically adjustable air outlet of the utility model. DETAILED DESCRIPTION

[0022] The present invention will be further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0023] Please refer to Figure 1 and Figure 2 .

[0024] The utility model discloses an electrically adjustable air outlet, comprising a housing 1, a cover plate 2 and a supporting bracket 3;

[0025] An air duct 11 is passed through the shell 1. A plurality of first through-slots 12 are provided on both sides of the shell. In this embodiment, two adjacent first through-slots 12 are parallel to each other, and the first through-slots 12 on both sides of the shell are symmetrical to each other. The first through-slots 12 are located at the edge of the air duct 11. A plurality of second through-slots 13 are provided on both sides of the shell. In this embodiment, two adjacent second through-slots 13 are parallel to each other, and the second through-slots 13 on the top and bottom of the shell are symmetrical to each other. The second through-slots 13 are located at the edge of the air duct 11. The first through-slots 12 and the second through-slots 13 are arranged around the edge of one end of the air duct 11. The length of the first through-slot 12 is less than the length of the second through-slot 13.

[0026] Furthermore, a plurality of first blades 111 are rotatably connected in the air duct 11. A first central axis extends from both sides of the first blade 111. The first central axis is close to one end of the first blade 111. In this embodiment, the number of the first central axis is preferably the same as the first through-slots 12. The first central axis is placed in adjacent first through-slots 12. The first central axis is in sliding contact with the inner wall of the first through-slot 12, so that the first blade 111 can swing a certain angle in the air duct 11.

[0027] Furthermore, multiple second blades 112 are rotatably connected in the air duct 11, and the first blade 111 and the second blade 112 are perpendicular to each other. A second central axis extends on both sides of the second blade 112, and the second central axis is close to one end of the second blade 112. In this embodiment, the number of second central axes is preferably the same as the second through grooves 13, and the second central axes are placed in adjacent second through grooves 13. The second central axes are in sliding contact with the inner walls of the second through grooves 13, so that the second blades 112 can swing to a certain angle in the air duct 11.

[0028] Furthermore, a plurality of slots 14 are provided on the outer side of the housing. The slots 14 are close to one end of the housing. In this embodiment, four slots 14 are preferably provided. The four slots 14 are close to four directions of the housing respectively.

[0029] An air trough is formed on the cover plate 2 and passes through the cover plate 2; a plurality of clips 21 are extended from the cover plate 2, and in this embodiment, four clips 21 are preferably provided, and the four clips 21 correspond to the four slots 14; a plurality of first limiting blocks 22 are extended from the cover plate 2 and arranged at intervals, and in this embodiment, the number of the first limiting blocks 22 is preferably the same as the number of the first through-slots 12; a plurality of second limiting blocks 23 are extended from the cover plate 2 and arranged at intervals, and in this embodiment, the number of the second limiting blocks 23 is preferably the same as the number of the second through-slots 13, and the plurality of first limiting blocks 22 and the plurality of second limiting blocks 23 are arranged around the edge of the air trough;

[0030] Furthermore, the cover plate 2 is covered on one end of the outer shell, the wind groove is connected to the air duct 11, and the buckle 21 is snapped into the adjacent slot 14, so that the cover plate 2 is fixed to the outer shell through the buckle 21; the first limit block 22 is snapped into the adjacent first through slot 12, and the first central axis contacts the first limit block 22. The first limit block 22 limits the first central axis to rotate in the first through slot 12, which is also convenient for installing the first blade 111 when producing this air outlet; the second limit block 23 is snapped into the adjacent second through slot 13, and the second central axis contacts the second limit block 23. The second limit block 23 limits the second central axis to rotate in the second through slot 13, which is also convenient for installing the second blade 112 when producing this air outlet.

[0031] Please refer to Figure 1 、 Figure 3 and Figure 4 .

[0032] The supporting bracket 3 is fixedly connected to one side of the housing 1. A dual-axis motor 31 is provided on the supporting bracket 3. A first bevel gear 311 is fixedly connected to one output shaft of the dual-axis motor 31.

[0033] A second bevel gear 33 is slidably connected to the supporting bracket 3, and a connecting column is extended from the supporting bracket 3. A connecting hole is opened in the center of the second bevel gear 33, and the inner wall of the connecting hole is in rotational contact with the outer side of the connecting column. The second bevel gear 33 slides parallel to the central axis of rotation, and the second bevel gear 33 slides close to the first bevel gear 311 and is matched with the first bevel gear 311. A first magnetic member is provided on the second bevel gear 33. In this embodiment, the first magnetic member is preferably a permanent magnet. A first electromagnet 32 is provided on the supporting bracket 3, and the first electromagnet 32 faces the first magnetic member. By utilizing the principle that like magnets attract and opposite magnets repel, the direction of the current in the first electromagnet 32 is changed, thereby changing the N of the first electromagnet 32. The N and S poles of the first electromagnet 32 are directed in the direction of the first and second poles, so that the first electromagnet 32 attracts the first magnetic member, pulls the second bevel gear 33 to slide closer and cooperate with the first bevel gear 311. A gap is left between the first electromagnet 32 and the first magnetic member to prevent the first magnetic member from contacting with the first electromagnet 32 and causing friction when the first bevel gear 311 drives the second bevel gear 33 to rotate, thereby generating a large resistance to the rotation of the second bevel gear 33. By changing the current direction of the first electromagnet 32, the N and S poles of the first electromagnet 32 are changed, so that the first electromagnet 32 repels the first magnetic member, pushes the second bevel gear 33 to slide away from the first bevel gear 311, and disconnects the second bevel gear 33 from the first bevel gear 311.

[0034] Furthermore, a first reciprocating mechanism is provided on the shell 1, the first reciprocating mechanism passes through the shell 1 and contacts the other end of the first blade 111, the second bevel gear 33 is connected to the first reciprocating mechanism, and the first reciprocating mechanism includes a third bevel gear 41, a first runner 411 and a first slide 42; the third bevel gear 41 is rotatably connected to the supporting bracket 3, the third bevel gear 41 is close to the second bevel gear 33, and a coaxial first pulley extends from the third bevel gear 41; the first runner 411 is rotatably connected to the supporting bracket 3, and a coaxial first pulley extends from the first runner 411 Two pulleys, the outer side of the first pulley and the outer side of the second pulley are sleeved with a first transmission belt 412, a guide column is extended on one side of the first rotating wheel 411, and the guide column is close to the edge of the first rotating wheel 411; a first slide groove 15 is provided on the shell 1, and the first slide plate 42 is placed in the first slide groove 15 for sliding connection, and the first slide plate 42 passes through the shell through the first slide groove 15 and contacts the first blade 111, and a guide groove 422 is provided on the first slide plate 42. In this embodiment, the guide groove 422 is preferably horizontal and parallel, and the guide column is placed in the guide groove 422 for sliding contact. 42 is provided with a plurality of first notches 421 arranged at intervals. In this embodiment, the number of the first notches 421 is preferably the same as the number of the first blades 111, and the other end of the first blade 111 is located in the first notch 421; when the second bevel gear 33 slides close to and is connected with the first bevel gear 311, the second bevel gear 33 is also connected with the third bevel gear 41, and the second bevel gear 33 drives the third bevel gear 41, the first transmission belt 412 and the first rotating wheel 411 to operate in sequence. When the first rotating wheel 411 rotates, the guide column slides in the guide groove 422 The first slide 42 moves, thereby driving the first slide plate 42 to move up and down in the first slide groove 15, and the first slide plate 42 pushes the other end of the first blade 111 through the first notch 421, so that the first blade 111 swings back and forth in the air duct 11; when the second bevel gear 33 slides away from the first bevel gear 311, the second bevel gear 33 is disconnected from the first bevel gear 311, and the second bevel gear 33 is also disconnected from the third bevel gear 41, so that the first rotor 411 stops rotating, so that the first slide plate 42 supports the first blade 111 to remain stationary at the current angle.

[0035] The first face gear 312 is fixedly connected to the other output shaft of the dual-axis motor 31, and a slide rod 35 is slidably connected to the supporting bracket 3. The top of the slide rod 35 is rotatably connected to the second face gear 351, and the second face gear 351 faces the first face gear 312. A second magnetic member is provided at the bottom of the slide rod 35. In this embodiment, the second magnetic member is preferably a permanent magnet; a second electromagnet 34 is provided on the supporting bracket 3, and the second electromagnet 34 faces the second magnetic member; by utilizing the principle that like magnets attract and opposite magnets repel, the direction of the current in the second electromagnet 34 is changed, thereby changing the N pole and With the S pole facing in the direction of the second electromagnet 34, the second magnetic member is attracted, the slide bar 35 is pulled downward, and the second face gear 351 approaches and is connected with the first face gear 312, so that the dual-axis motor 31 can drive the second face gear 351 to rotate through the first face gear 312. By changing the direction of the current in the second electromagnet 34, the N pole and S pole directions of the second electromagnet 34 are changed, so that the second electromagnet 34 repels the second magnetic member, pushing the slide bar 35 upward, and the second face gear 351 moves away from the first face gear 312, thereby disconnecting the second face gear 351 from the first face gear 312.

[0036] The second gear 351 is connected to the first reciprocating mechanism, and the second reciprocating mechanism includes a second rotating wheel 51, a second slide plate 52 and a rocker arm 512; the second rotating wheel 51 is rotatably connected to the top of the shell, and a coaxial third pulley is extended from the second face gear 351. The second rotating wheel 51 and the third pulley are sleeved with a second transmission belt 511 on the outer side. In this embodiment, the second transmission belt 511 is preferably a specific elastic rubber band; a second slide groove 16 is provided on the shell 1, and the second slide plate 52 is placed in the second slide groove 16 for sliding connection. The second slide plate 52 passes through the shell through the second slide groove 16 and contacts the other end of the second blade 112. A plurality of second notches 521 are arranged at intervals on the second slide plate 52. In this embodiment, the number of the second notches 521 is preferably the same as the number of the second blade 112. The other end of the second blade 112 is located in the second notch 521, and the two ends of the rocker arm 512 are respectively connected to the second slide plate 52 and the first The second rotating wheel 51 is connected in rotation, and the connection between the rocker arm 512 and the second rotating wheel 51 is close to the edge of the second rotating wheel 51; when the slide rod 35 is pulled down, the second face gear 351 is close to and connected with the first face gear 312, and the second face gear 351 drives the second transmission belt 511 and the second rotating wheel 51 to run in turn. When the second rotating wheel 51 rotates, it drives the rocker arm 512 to move, so that the rocker arm 512 can drive the second slide plate 52 to slide back and forth in the second sliding groove 16, and the second slide plate 52 is pushed through the second notch 521 The other end of the second blade 112 causes the second blade 112 to swing back and forth in the air duct 11; when the slide bar 35 rises, the second face gear 351 moves away from the first face gear 312, disconnecting the matching connection between the second face gear 351 and the first face gear 312, causing the second rotating wheel 51 to stop rotating, thereby allowing the second slide plate 52 to support the second blade 112 to remain stationary at the current angle. Since the second transmission belt 511 has high elasticity, the second transmission belt 511 will not be broken when the slide bar 35 rises to a certain height.

[0037] Please refer to Figure 1 and Figure 5 .

[0038] A mounting portion extends from one end of the supporting bracket 3, and the mounting portion is close to the cover plate 2. A plurality of switches 36 are fixedly connected in the mounting portion, and three switches 36 are preferably provided in this embodiment; a plurality of buttons 24 are provided on the cover plate 2, and three buttons 24 are preferably provided in this embodiment, and the three buttons 24 correspond to and are close to the three switches 36, respectively, and the buttons 24 touch the switches 36; the first switch 36 is used to control the current direction of the first electromagnet 32, the second switch 36 is used to control the current direction of the second electromagnet 34, and the third switch 36 is used to control the start or shut down of the dual-axis motor 31, so that the user can control the opening or closing of the upper and lower sweeping and the left and right sweeping of the air outlet through the buttons 24.

[0039] The utility model provides an electrically adjustable air outlet, which uses a dual-axis motor to simultaneously drive a first reciprocating mechanism and a second reciprocating mechanism to operate, so that the first reciprocating mechanism drives the first blade to swing back and forth, and the second reciprocating mechanism drives the second blade to swing back and forth, so that the cold air in the air duct can change the blowing direction in four directions under the guidance of the first blade and the second blade.

[0040] By changing the N pole and S pole of the first electromagnet, the first electromagnet pushes or pulls the second bevel gear close to or away from the first bevel gear, disconnects or connects the cooperation between the first bevel gear and the second bevel gear, and allows the first blade to start or stop swinging, so that the air outlet can automatically sweep the air up and down or pause at a fixed angle for blowing air; by changing the N pole and S pole of the second electromagnet, the second electromagnet pushes or pulls the sliding rod, so that the second face gear approaches or moves away from the first face gear, disconnects or connects the cooperation between the first face gear and the second face gear, and allows the second blade to start or stop swinging, so that the air outlet can automatically sweep the air left and right or pause at a fixed angle for blowing air; the blowing mode of the air outlet is realized by electrically controlling the air outlet, making the air outlet more functional.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. An electrically adjustable air outlet, characterized in that: comprising a shell and a bearing bracket; The housing is provided with an air duct, wherein a plurality of first blades arranged at intervals are rotatably connected in the air duct, and a plurality of second blades arranged at intervals are rotatably connected in the air duct, wherein the first blades and the second blades are perpendicular to each other, and a first reciprocating mechanism and a second reciprocating mechanism are provided in the housing, wherein the first reciprocating mechanism passes through the housing and contacts the first blades, and the second reciprocating mechanism passes through the housing and contacts the second blades; The supporting bracket is fixedly connected to the shell, and a dual-axis motor is provided on the supporting bracket, and a first helical gear is fixedly connected to one of the output shafts of the dual-axis motor, and a second helical gear is slidably connected to the supporting bracket, and a first magnetic part is provided on the second helical gear. A first electromagnet is provided on the supporting bracket, and the first electromagnet faces the first magnetic part, and the second helical gear is connected to the first reciprocating mechanism. The first face gear is fixedly connected to the other output shaft of the dual-axis motor, and a sliding rod is slidably connected to the supporting bracket, and a second magnetic part is provided on the sliding rod, and a second electromagnet is provided on the supporting bracket, and the second electromagnet faces the second magnetic part. The second face gear is rotatably connected to the sliding rod, and the second face gear faces the first face gear, and the second face gear is connected to the first reciprocating mechanism.

2. The electrically adjustable air outlet according to claim 1, characterized in that: The first reciprocating mechanism includes a third bevel gear, a first rotating wheel and a first slide. The third bevel gear is rotatably connected to the supporting bracket. The third bevel gear is close to the second bevel gear. A coaxial first pulley extends from the third bevel gear. The first rotating wheel is rotatably connected to the supporting bracket. A coaxial second pulley extends from the first rotating wheel. A first transmission belt is provided on the first and second pulleys. The first slide passes through the outer shell and contacts the first blade. The first rotating wheel is slidably connected to the first slide.

3. The electrically adjustable air outlet according to claim 2, characterized in that: A guide column extends from one side of the first rotating wheel, a first sliding groove is provided on the shell, the first slide is placed in the first sliding groove for sliding connection, a guide groove is provided on the first slide, the guide column is placed in the guide groove for sliding contact, a plurality of first notches arranged at intervals are provided on the first slide, and the first blade is located in the first notch.

4. The electrically adjustable air outlet according to claim 3, characterized in that: The second reciprocating mechanism includes a second rotating wheel and a second slide. The second rotating wheel is rotatably connected to the outer shell. A coaxial third pulley extends from the second face gear. A second transmission belt is sleeved on the outer side of the second rotating wheel and the third pulley. The second slide passes through the outer shell and contacts the second blade. The second rotating wheel is connected to the second slide.

5. The electrically adjustable air outlet according to claim 4, characterized in that: The shell is provided with a second slide groove, the second slide plate is placed in the second slide groove for sliding connection, the second slide plate is provided with a plurality of second notches arranged at intervals, the second blades are located in the second notches, and the second reciprocating mechanism also includes a rocker arm, the two ends of the rocker arm are respectively rotatably connected to the second slide plate and the second rotating wheel.

6. The electrically adjustable air outlet according to claim 5, characterized in that: Both sides of the shell are provided with a plurality of first through slots arranged at intervals, and the top and bottom of the shell are provided with a plurality of second through slots arranged at intervals. A first central axis extends on both sides of the first blade, and the first central axis is placed in the adjacent first through slot. A second central axis extends on both sides of the second blade, and the second central axis is placed in the adjacent second through slot.

7. The electrically adjustable air outlet according to claim 6, characterized in that: It also includes a cover plate, which has an air trough, a plurality of clips extending from the cover plate, a plurality of clip slots on the outer side of the shell, the cover plate is covered on the shell, the air trough is connected to the air duct, and the clips are snapped into adjacent clip slots.

8. The electrically adjustable air outlet according to claim 7, characterized in that: A plurality of first limit blocks arranged at intervals extend from the cover plate, and a plurality of second limit blocks arranged at intervals extend from the cover plate. The plurality of first limit blocks and the plurality of second limit blocks are arranged around the wind slot, the first limit blocks are snapped into adjacent first through slots, and the second limit blocks are snapped into adjacent second through slots.

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