Fan blade and fan

Abstract

The utility model discloses a fan blade and a fan, and relates to the technical field of fans. The blade comprises a rotating shaft, a blade body is arranged on the rotating shaft, an oil storage cavity is formed in the blade body, a plurality of arc-shaped cavities distributed in an annular array mode are formed in the blade body, and the arc-shaped cavities communicate with the oil storage cavity through oil outlet holes; elastic plugging pieces which are the same as the arc-shaped cavities in number and correspond to the arc-shaped cavities in a one-to-one mode are arranged on the blade body in a sliding mode and used for plugging or unplugging the oil outlet holes. When the fan blade is used, the contact position of the rotating shaft and the blade body is automatically lubricated under the action of centrifugal force, the shutdown frequency of a fan is reduced, operation is convenient, meanwhile, the working efficiency is guaranteed, and therefore the fan blade is more practical.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a fan blade and a fan. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. There are many types of fans, which can be divided into axial flow fans, centrifugal fans, diagonal flow fans, etc. according to their working principles. Among them, the axial flow fan mainly includes a wind tube, a bracket, a rotating shaft, a motor and a fan blade. The bracket is arranged in the wind tube, and the rotating shaft is rotatably arranged on the bracket. The motor is arranged on the bracket and the output shaft is connected to the rotating shaft. The fan blades are connected to the rotating shaft. During the long-term rotation of the fan blades, wear will occur between the fan blades and the rotating shaft. In the prior art, it is necessary to stop the machine regularly to add lubricating oil, which is not only inconvenient to operate, but also reduces the working efficiency. Therefore, a fan blade and a fan are proposed. Utility Model Content

[0003] The purpose of the present application is to solve the technical problem that the fan blades will wear against the shaft during long-term rotation. In the prior art, it is necessary to stop the machine regularly to add lubricating oil, which is not only inconvenient to operate but also reduces work efficiency. The present application provides a fan blade and a fan.

[0004] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0005] A fan blade, comprising:

[0006] A rotating shaft is provided with a blade body, an oil storage cavity is provided in the blade body, a plurality of arc cavities distributed in a circular array are provided on the blade body, the arc cavities are connected to the oil storage cavity through oil outlet holes, and elastic sealing members are slidably provided on the blade body, the number of which is the same as that of the arc cavities and corresponds to each other one by one, and the elastic sealing members are used to seal or unseal the oil outlet holes.

[0007] Furthermore, a refueling channel communicating with the oil storage cavity is provided on the blade body, and a sealing plug is provided on the inner thread of the refueling channel.

[0008] Furthermore, the elastic sealing member includes a slide rod slidably arranged on the blade body, an extrusion spring is arranged between the slide rod and the oil storage cavity, an arc plate is arranged at the free end of the slide rod, and a sealing block plugged with the oil outlet is arranged on the arc plate.

[0009] A fan, comprising the above-mentioned fan blade, further comprising:

[0010] The wind tube has a bracket arranged inside, a rotating shaft is rotatably arranged on the bracket, a motor with an output shaft connected to the rotating shaft is arranged on the bracket, grille plates are detachably arranged at both ends of the wind tube, two blocking mechanisms are symmetrically arranged on the wind tube, which are used to block or unblock the wind tube, the blocking mechanism includes a rotating rod and a second filter plate which are both rotatably arranged in the wind tube and coaxially distributed, a first filter plate is arranged on the rotating rod, and the first filter plate and the second filter plate are both semicircular in structure, a fixing frame is arranged on the wind tube, and a driving member which acts on the rotating rod and the second filter plate and drives the two to reverse synchronously is arranged on the fixing frame.

[0011] Furthermore, the driving member includes a sliding frame slidably arranged on a fixed frame, a cylinder push rod with a movable end connected to the sliding frame is arranged on the fixed frame, two waist holes are opened on the sliding frame, the rotating rod and the second filter plate are both provided with connecting rods, and the connecting rods are provided with protrusions that slide with the waist holes.

[0012] Furthermore, the grid plate is provided with a plurality of positioning holes, the wind tube is provided with positioning tubes having the same number as the positioning holes and correspondingly plugged in one by one, the positioning tubes are provided with locking members that act on the grid plate and lock or unlock it, and the wind tube is provided with a driving part that acts on the plurality of locking members, which is used to drive the plurality of locking members to operate synchronously.

[0013] Furthermore, the locking member includes a sliding groove and a plurality of bar grooves which are both opened on the positioning cylinder and connected to each other. A sliding rod is slidably arranged in the sliding groove. A connecting rod which is the same number as the bar grooves and which is slidably matched in a one-to-one manner is hingedly connected to the sliding rod at 90 degrees. A torsion spring is arranged at the hinge of the connecting rod, and the connecting rod is in contact and overlapped with the grid plate.

[0014] Furthermore, the driving part comprises an annular plate slidably arranged on the wind tube, the free ends of a plurality of sliding rods are connected to the annular plate, and a screw rod rotatably connected to the annular plate is threadedly arranged on the wind tube.

[0015] The beneficial effects of this application are as follows:

[0016] When the present application is in use, the contact position between the rotating shaft and the blade body is automatically lubricated with the help of centrifugal force, which reduces the frequency of fan shutdown, facilitates operation and ensures work efficiency, and is therefore more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the fan blade structure of the present application;

[0018] Figure 2 This application Figure 1 A three-dimensional cross-sectional view of

[0019] Figure 3 This application Figure 2 The enlarged view of point A in the middle;

[0020] Figure 4 This application Figure 2 The enlarged view of point B in the middle;

[0021] Figure 5 It is a three-dimensional diagram of the fan structure of the present application;

[0022] Figure 6 This application Figure 5 A three-dimensional cross-sectional view of

[0023] Figure 7 It is an exploded perspective view of part of the structure of the fan of the present application;

[0024] Figure 8 It is a partial structural stereogram of the fan of the present application;

[0025] Fig. 9 This application Figure 8 A three-dimensional cross-sectional view of

[0026] Fig.10 This application Fig. 9 Enlarged view of point C in the middle.

[0027] Figure numerals: 1. rotating shaft; 2. blade body; 3. oil storage chamber; 4. arc-shaped chamber; 5. oil outlet; 6. oil filling channel; 7. sealing plug; 8. sliding rod; 9. extrusion spring; 10. arc-shaped plate; 11. blocking block; 12. air cylinder; 13. bracket; 14. motor; 15. grid plate; 16. rotating rod; 17. second filter plate; 18. first filter plate; 19. fixed frame; 20. sliding frame; 21. cylinder push rod; 22. waist hole; 23. connecting rod; 24. bump; 25. positioning hole; 26. positioning cylinder; 27. slide groove; 28. strip groove; 29. ​​sliding rod; 30. connecting rod; 31. torsion spring; 32. annular plate; 33. screw. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0029] like Figure 1-Figure 4 As shown, a fan blade proposed in one embodiment of the present application includes:

[0030] A rotating shaft 1 is provided with a blade body 2, the rotating shaft 1 is in a horizontal direction, an oil storage chamber 3 is provided in the blade body 2, the oil storage chamber 3 is coaxially distributed with the blade body 2, a plurality of arc-shaped chambers 4 distributed in an annular array are provided on the blade body 2, the plurality of arc-shaped chambers 4 are distributed in an annular array with the oil storage chamber 3 as the center, the arc-shaped chambers 4 are connected with the oil storage chamber 3 through oil outlet holes 5, an elastic plugging piece having the same number as the arc-shaped chambers 4 and corresponding to each other is slidably provided on the blade body 2, and is used to plug or unblock the oil outlet holes 5, and the sliding direction of the elastic plugging piece is perpendicular to the axis of the blade body 2;

[0031] In the initial state, the elastic plugging member is in a natural state and close to the axis of the blade body 2, and the oil outlet hole 5 is blocked by the elastic plugging member. When in use, lubricating oil is added to the oil storage chamber 3. When the blade body 2 rotates, the multiple elastic plugging members are driven to slide away from the axis of the blade body 2 by means of centrifugal force. The elastic plugging member is in an extruded state and the oil outlet hole 5 is unblocked. The lubricating oil in the oil storage chamber 3 enters the arc cavity 4 through the oil outlet hole 5, thereby lubricating the contact position between the rotating shaft 1 and the blade body 2. Conversely, when the blade body 2 stops rotating, the multiple elastic plugging members are reset to the natural state and slide close to the axis of the blade body 2, and the oil outlet hole 5 is blocked again by the elastic plugging member.

[0032] In summary, when in use, the present application realizes automatic lubrication of the contact position between the rotating shaft 1 and the blade body 2 by means of centrifugal force, thereby reducing the frequency of fan shutdown, facilitating operation while also ensuring work efficiency, and is therefore more practical.

[0033] like Figure 4 As shown, in some embodiments, a refueling channel 6 communicating with the oil storage chamber 3 is provided on the blade body 2, and a sealing plug 7 is provided on the inner thread of the refueling channel 6;

[0034] Referring to the above, in the initial state, the sealing plug 7 blocks the refueling channel 6. When in use, the sealing plug 7 is loosened to be away from the refueling channel 6, lubricating oil is added to the oil storage chamber 3 through the refueling channel 6, and then the sealing plug 7 is tightened into the refueling channel 6.

[0035] like Figure 3 As shown, in some embodiments, the elastic blocking member includes a slide bar 8 slidably arranged on the blade body 2, the sliding direction of the slide bar 8 is perpendicular to the axis of the blade body 2, an extrusion spring 9 is arranged between the slide bar 8 and the oil storage chamber 3, the two ends of the extrusion spring 9 are respectively fixedly connected to the slide bar 8 and the oil storage chamber 3, and an arc plate 10 is arranged at the free end of the slide bar 8, the arc plate 10 is located in the arc cavity 4 and is fixedly connected to the slide bar 8, and a blocking block 11 plugged with the oil outlet hole 5 is arranged on the arc plate 10, and the blocking block 11 is fixedly arranged on the arc plate 10;

[0036] Referring to the above, in the initial state, the extrusion spring 9 is in a natural state, the blocking block 11 blocks the oil outlet hole 5, and the slide rod 8 is close to the axis of the blade body 2. When the blade body 2 rotates, with the help of centrifugal force, the slide rod 8 is driven to slide to the axis away from the blade body 2, the extrusion spring 9 is squeezed, and the blocking block 11 withdraws from the oil outlet hole 5, thereby unblocking the oil outlet hole 5. Conversely, when the blade body 2 stops rotating, the extrusion spring 9 is reset to the natural state, the slide rod 8 slides to the initial position, and the blocking block 11 blocks the oil outlet hole 5 again.

[0037] like Figure 5-Figure 10 As shown, in some embodiments, the fan, including the above-mentioned fan blade, further includes:

[0038] The wind tube 12 has a bracket 13 disposed therein, the wind tube 12 is in a horizontal direction, the bracket 13 is fixedly disposed in the wind tube 12, the rotating shaft 1 is rotatably disposed on the bracket 13, the bracket 13 is provided with a motor 14 whose output shaft is connected to the rotating shaft 1, the motor 14 is fixedly disposed on the bracket 13, both ends of the wind tube 12 are detachably provided with a grid plate 15, the grid plate 15 is in a vertical direction, two blocking mechanisms are symmetrically disposed on the wind tube 12, which are used to block or unblock the wind tube 12, the blocking mechanism includes a rotating rod 16 and a second rotating rod 16 both rotatably disposed in the wind tube 12 and coaxially distributed The filter plate 17, the rotating rod 16 and the second filter plate 17 are all in a vertical direction. The rotating rod 16 is provided with a first filter plate 18, which is in a vertical direction and fixed on the rotating rod 16. The first filter plate 18 and the second filter plate 17 are both semicircular in structure. A fixing frame 19 is provided on the wind tube 12, and the fixing frame 19 is fixed on the wind tube 12. The fixing frame 19 is provided with a driving member that acts on the rotating rod 16 and the second filter plate 17 and drives the two to synchronously reverse. The synchronous reversal here refers to the rotating rod 16 and the second filter plate 17 synchronously rotating in the opposite direction by 90 degrees;

[0039] When the fan is in use, the two grid plates 15 together play a filtering role to prevent debris from entering the air duct 12. In the prior art, when the grid plates 15 need to be disassembled for cleaning, since the air duct 12 is in an unobstructed state, debris can easily enter the air duct 12 and adhere to the blade body 2, affecting subsequent use. In this embodiment, when the grid plates 15 are disassembled, debris can still be prevented from entering the air duct 12, ensuring subsequent use, as follows:

[0040] In the initial state, both grid plates 15 are in the installed state, and the blocking mechanism unblocks the wind duct 12, that is, the first filter plate 18 and the second filter plate 17 are in the overlapped state. When the grid plate 15 needs to be removed, the wind duct 12 is blocked by the blocking mechanism, that is, the driving member drives the rotating rod 16 and the second filter plate 17 to rotate synchronously in the opposite direction by ninety degrees until the first filter plate 18 and the second filter plate 17 are in the unfolded state, the two form a circular structure and block the wind duct 12 together to prevent debris from entering the wind duct 12. Conversely, when the grid plate 15 is installed, the wind duct 12 is unblocked by the blocking mechanism, that is, the driving member drives the rotating rod 16 and the second filter plate 17 to rotate synchronously in the opposite direction by ninety degrees until the first filter plate 18 and the second filter plate 17 are in the overlapped state.

[0041] like Figure 7 As shown, in some embodiments, the driving member includes a sliding frame 20 slidably arranged on a fixed frame 19, the sliding frame 20 slides in a horizontal direction, a cylinder push rod 21 whose movable end is connected to the sliding frame 20 is arranged on the fixed frame 19, the cylinder push rod 21 is fixed on the fixed frame 19, two waist holes 22 are opened on the sliding frame 20, the two waist holes 22 are both horizontal and spaced, the waist holes 22 have relatively distributed initial points and limit points, the rotating rod 16 and the second filter plate 17 are both provided with connecting rods 23, the two connecting rods 23 are both horizontal and spaced up and down, the two connecting rods 23 are respectively fixed on the rotating rod 16 and the second filter plate 17, and the connecting rod 23 is provided with a protrusion 24 that slides with the waist hole 22, and the two protrusions 24 are respectively fixed on the opposite sides of the two connecting rods 23;

[0042] Referring to the above, in the initial state, the movable end of the cylinder push rod 21 extends out, the sliding frame 20 is located in the initial position, a 45-degree angle is generated between the two connecting rods 23, and the two protrusions 24 are respectively located at the initial points of the two waist holes 22. The first filter plate 18 and the second filter plate 17 are in an overlapping state. When in use, the movable end of the cylinder push rod 21 is driven to be retracted, driving the sliding frame 20 to slide to the limit position. During this process, the two connecting rods 23 first rotate in the opposite direction by 45 degrees to be parallel, and the two protrusions 24 slide to the limit points of the two waist holes 22 respectively. Then, the two connecting rods 23 rotate in the opposite direction by 45 degrees to generate a 45-degree angle, and the two protrusions 24 slide to the limit points of the two waist holes 22 respectively. At the initial point of the filter plate 17, the rotating rod 16 and the second filter plate 17 rotate synchronously in the opposite direction by ninety degrees, and the first filter plate 18 and the second filter plate 17 are both in the expanded state. Conversely, when the movable end of the cylinder push rod 21 extends, it drives the sliding frame 20 to slide to the limit position. During this process, the two connecting rods 23 first rotate synchronously in the opposite direction by forty-five degrees to be parallel, and the two protrusions 24 slide to the limit points of the two waist holes 22 respectively. Then, the two connecting rods 23 rotate synchronously in the opposite direction by forty-five degrees to produce a forty-five degree angle, and the two protrusions 24 slide to the initial points of the two waist holes 22 respectively, and the rotating rod 16 and the second filter plate 17 rotate synchronously in the opposite direction by ninety degrees, and the first filter plate 18 and the second filter plate 17 are in the overlapped state.

[0043] like Figure 8-Figure 10 As shown, in some embodiments, a plurality of positioning holes 25 are provided on the grid plate 15, and the plurality of positioning holes 25 are provided in a horizontal direction and are distributed in a circular array. The wind tube 12 is provided with positioning cylinders 26, which are the same in number as the positioning holes 25 and are plugged in one-to-one with each other. The positioning cylinders 26 are in a horizontal direction and fixed on the wind tube 12. The positioning cylinders 26 are provided with locking members that act on the grid plate 15 and lock or unlock it. The wind tube 12 is provided with a driving part that acts on the plurality of locking members, and is used to drive the plurality of locking members to operate synchronously.

[0044] In the prior art, the grid plate 15 is usually assembled and disassembled by using multiple bolts. When in use, multiple bolts need to be tightened or loosened in sequence, which is not only inconvenient to operate, but also reduces work efficiency. In this embodiment, the grid plate 15 can be quickly assembled and disassembled, which is convenient to operate and improves work efficiency. The details are as follows:

[0045] In the initial state, the grid plate 15 is in the installation state and is in contact with and overlaps the wind tube 12, and the multiple positioning cylinders 26 pass through the multiple positioning holes 25 respectively, and the multiple locking members act on the grid plate 15 and lock it. The grid plate 15 cannot be away from the wind tube 12, and the positioning cylinder 26 cannot withdraw from the positioning hole 25. When the grid plate 15 needs to be disassembled, the multiple locking members are driven by the driving unit to operate synchronously, and the multiple locking members unlock the grid plate 15, so that the grid plate 15 can be away from the wind tube 12, and the positioning cylinder 26 can withdraw from the positioning hole 25. Conversely, when the grid plate 15 needs to be installed, the grid plate 15 is placed in a vertical direction and in contact with and overlaps the wind tube 12. In this process, the multiple positioning cylinders 26 correspond to and pass through the multiple positioning holes 25 respectively, and the multiple locking members are driven by the driving unit to operate synchronously, and the multiple locking members lock the grid plate 15.

[0046] like Fig.10 As shown, in some embodiments, the locking member includes a slide groove 27 and a plurality of bar grooves 28 which are both opened on the positioning cylinder 26 and are connected. The slide groove 27 and the bar groove 28 are both opened in the horizontal direction. The plurality of bar grooves 28 are distributed in a circular array with the slide groove 27 as the center. A sliding rod 29 is slidably arranged in the slide groove 27. The sliding rod 29 slides in the horizontal direction. The sliding rod 29 is hinged at 90 degrees with a connecting rod 30 which is the same in number as the bar grooves 28 and corresponds to each other in a one-to-one sliding manner. A torsion spring 31 is arranged at the hinge of the connecting rod 30. The two ends of the torsion spring 31 are fixedly connected to the connecting rod 30 and the sliding rod 29 respectively. The connecting rod 30 is in contact with and overlaps the grid plate 15. The driving part is used to drive the plurality of sliding rods 29 to slide synchronously.

[0047] Referring to the above, in the initial state, the grid plate 15 is in the installed state, at which time the sliding rod 29 is in the extreme position, the connecting rod 30 is perpendicular to the axis of the sliding rod 29 and cannot rotate, the connecting rod 30 is in contact with the grid plate 15, and the torsion spring 31 is in a natural state. Due to the obstruction of the connecting rod 30, the grid plate 15 cannot move, thereby locking the grid plate 15. When the grid plate 15 needs to be disassembled, the multiple sliding rods 29 are driven by the driving unit to slide synchronously to the initial position. During this process, the connecting rod 30 rotates around the hinge point and forces the torsion spring 31 to be squeezed, and the connecting rod 30 moves away from the grid plate 15 and retracts into the slide groove 27. The connecting rod 30 is parallel to the axis of the sliding rod 29. At this time, due to the loss of the obstruction of the connecting rod 30, the grid plate 15 is able to move, thereby unlocking the grid plate 15.

[0048] like Figure 8 As shown, in some embodiments, the driving part includes an annular plate 32 slidably disposed on the wind tube 12, the annular plate 32 is in a vertical direction and slides in a horizontal direction, the free ends of the plurality of sliding rods 29 are connected to the annular plate 32, and the wind tube 12 is threadedly provided with a screw 33 rotatably connected to the annular plate 32, and the screw 33 is in a horizontal direction;

[0049] Referring to the above, in the initial state, the annular plate 32 is in the extreme position, and the multiple sliding rods 29 are all in the extreme positions. When the grid plate 15 needs to be removed, the screw rod 33 is reversed, and the annular plate 32 slides to the initial position, driving the multiple sliding rods 29 to slide to the initial position synchronously. Conversely, when the grid plate 15 needs to be installed, the screw rod 33 is turned forward, and the annular plate 32 slides to the extreme position, driving the multiple sliding rods 29 to slide to the extreme position synchronously.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fan blade, characterized in that: include: A rotating shaft (1) is provided with a blade body (2), an oil storage cavity (3) is provided in the blade body (2), a plurality of arc-shaped cavities (4) distributed in a ring array are provided on the blade body (2), the arc-shaped cavities (4) and the oil storage cavity (3) are communicated through oil outlet holes (5), and elastic blocking pieces are slidably provided on the blade body (2), the same number as the arc-shaped cavities (4) and corresponding to each other, and are used to block or release the oil outlet holes (5).

2. The fan blade according to claim 1, characterized in that: The blade body (2) is provided with a refueling channel (6) communicating with the oil storage chamber (3), and the refueling channel (6) is provided with a sealing plug (7) on the inner thread.

3. The fan blade according to claim 1, characterized in that: The elastic sealing member comprises a slide rod (8) slidably arranged on the blade body (2), a compression spring (9) is arranged between the slide rod (8) and the oil storage chamber (3), an arc plate (10) is arranged at the free end of the slide rod (8), and a sealing block (11) is arranged on the arc plate (10) and is plugged into and matched with the oil outlet hole (5).

4. A fan, comprising a fan blade according to any one of claims 1 to 3, characterized in that: Also includes: A wind tube (12) is provided with a bracket (13) inside thereof, a rotating shaft (1) is rotatably arranged on the bracket (13), a motor (14) whose output shaft is connected to the rotating shaft (1) is arranged on the bracket (13), grid plates (15) are detachably arranged at both ends of the wind tube (12), two blocking mechanisms are symmetrically arranged on the wind tube (12), and are used to block or release the blocking of the wind tube (12), the blocking mechanisms comprising a rotating rod (16) and a second filter plate (17) both rotatably arranged in the wind tube (12) and coaxially distributed, a first filter plate (18) is arranged on the rotating rod (16), and the first filter plate (18) and the second filter plate (17) are both semicircular in structure, and a fixing frame (19) is arranged on the wind tube (12), and a driving member is arranged on the fixing frame (19) for acting on the rotating rod (16) and the second filter plate (17) and driving the two to rotate synchronously in reverse.

5. The fan according to claim 4, characterized in that: The driving member comprises a sliding frame (20) slidably arranged on a fixed frame (19); a cylinder push rod (21) whose movable end is connected to the sliding frame (20) is arranged on the fixed frame (19); two waist holes (22) are provided on the sliding frame (20); a connecting rod (23) is provided on both the rotating rod (16) and the second filter plate (17); and a protrusion (24) is provided on the connecting rod (23) for slidingly cooperating with the waist hole (22).

6. The fan according to claim 4, characterized in that: The grid plate (15) is provided with a plurality of positioning holes (25); the wind tube (12) is provided with positioning cylinders (26) having the same number as the positioning holes (25) and correspondingly plugged in one to one; the positioning cylinders (26) are provided with locking members that act on the grid plate (15) and lock or unlock it; and the wind tube (12) is provided with a driving unit that acts on the plurality of locking members and is used to drive the plurality of locking members to operate synchronously.

7. The fan according to claim 6, characterized in that: The locking member comprises a slide groove (27) and a plurality of bar grooves (28) which are both opened on the positioning cylinder (26) and connected to each other. A sliding rod (29) is slidably arranged in the slide groove (27). The sliding rod (29) is hinged at 90 degrees with connecting rods (30) which are the same in number as the bar grooves (28) and are slidably matched in a one-to-one correspondence. A torsion spring (31) is arranged at the hinge of the connecting rod (30). The connecting rod (30) is in contact with and overlaps the grid plate (15).

8. The fan according to claim 7, characterized in that: The driving part comprises an annular plate (32) slidably arranged on the wind tube (12), the free ends of a plurality of sliding rods (29) are connected to the annular plate (32), and a screw rod (33) rotatably connected to the annular plate (32) is threadedly arranged on the wind tube (12).

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