Handle device and fan having the same

Abstract

A handle device includes a handle connector and a handle. The handle is pivotally connected to the handle connector, allowing it to rotate relative to the handle connector. The handle has a pivot portion, and the handle is pivotally connected to the handle connector via the pivot portion. During the rotation of the handle, the pivot portion can interfere with and rub against the handle connector. Based on this design, the interference friction between the pivot portion and the handle connector during the rotation of the handle increases the rotational resistance of the handle relative to the handle connector, thus easily producing a rotational damping effect between the handle and the handle connector. Therefore, this handle rotational damping design is simple and practical.

Description

[Technical Field]

[0001] The present invention relates to a handle device and a fan having the handle device, and more particularly to the design of a rotation damping mechanism for the handle device. [Background Technology]

[0002] If a rotatable handle is not damped to suppress its rotation, the rotation can be unpredictable, uncontrollable, and violent, leading to collisions with other objects, causing significant noise or damage. Existing damping designs for rotatable handles are complex, often requiring additional damping components such as torsion springs or damping sleeves. This complicates assembly and increases material costs, making them impractical and requiring further improvement. [Summary of the Invention]

[0003] This patent application provides a relatively simple and practical handle rotation damping design for handle devices.

[0004] A handle device includes a handle connector and a handle. The handle is pivotally connected to the handle connector, thereby being rotatable relative to the handle connector. The handle has a pivot portion, and the handle is pivotally connected to the handle connector via the pivot portion. During the rotation of the handle, the pivot portion may interfere with and rub against the handle connector.

[0005] Based on this design, interference friction occurs between the pivot and the handle connecting seat during the rotation of the handle, which increases the rotational resistance of the handle relative to the handle connecting seat. This simply produces a rotational damping effect between the handle and the handle connecting seat. Therefore, this handle rotational damping design is simple and practical.

[0006] Optionally, the handle connecting seat is provided with a shaft receiving frame opening that at least partially accommodates the shaft portion, and the shaft portion interferes with and rubs against the inner wall surface of the shaft receiving frame opening during the rotation of the handle.

[0007] Optionally, the handle connector is provided with the shaft receiving frame opening at opposite ends in the direction of the rotation axis of the handle, and the shaft portion extends from one end to the other end of the handle connector in the direction of the rotation axis of the handle, with the handle connector covering the shaft portion.

[0008] Optionally, the rotating shaft extends through the rotating shaft receiving frame opening. During the rotation of the handle, the rotating shaft receiving frame opening is expanded by the rotating shaft due to interference friction between the rotating shaft and the inner wall surface of the rotating shaft receiving frame opening. After the interference friction, the rotating shaft receiving frame opening returns to its original state.

[0009] Optionally, the rotating shaft is provided with several anti-rotation protrusions. During the rotation of the handle, the rotating shaft interferes with and rubs against the handle connecting seat by means of the anti-rotation protrusions.

[0010] Optionally, the handle connector is provided with a shaft receiving frame opening that at least partially accommodates the shaft portion. During the rotation of the handle, the shaft portion interferes with and rubs against the inner wall surface of the shaft receiving frame opening through the anti-rotation protrusion.

[0011] Optionally, the inner wall surface of the rotating shaft receiving frame includes a first side and a second side located on opposite sides of the rotating shaft. During the rotation of the handle, one of the anti-rotation protrusions interferes with the first side and another anti-rotation protrusion interferes with the second side.

[0012] Optionally, the plurality of anti-rotation protrusions are spaced apart in the circumferential direction of the rotating shaft, with two anti-rotation protrusions that are opposite each other in the radial direction of the rotating shaft forming a pair. During the rotation of the handle, one of the pair of anti-rotation protrusions interferes with the first side surface and the other interferes with the second side surface.

[0013] Optionally, the first side and the second side are radially opposite each other at the pivot, and the inner wall of the pivot receiving frame also includes an arcuate surface protruding away from the pivot. The arcuate surface connects the first side and the second side, and at least a portion of the first side, the arcuate surface, and at least a portion of the second side form an arch that straddles the pivot.

[0014] Optionally, the handle connector may also have a first sidewall and a second sidewall located on opposite sides of the pivot portion, and the pivot receiving frame opening is formed between the first sidewall and the second sidewall. The first sidewall constitutes a surface of the first sidewall facing the second sidewall, and the second sidewall constitutes a surface of the second sidewall facing the first sidewall.

[0015] Optionally, during the rotation of the handle, the interference friction between the anti-rotation protrusion and the inner wall of the rotating shaft receiving frame causes the gap between the first sidewall and the second sidewall to widen under the pressure of the anti-rotation protrusion; after the interference friction, the gap between the first sidewall and the second sidewall returns to its original state.

[0016] Optionally, the rotating shaft is a hollow tube. During the rotation of the handle, the rotating shaft interferes with the inner wall of the rotating shaft receiving frame, causing the rotating shaft to deform under the pressure of the first and second side walls. After the interference friction, the rotating shaft returns to its original shape.

[0017] Optionally, the handle connector may also have a side end wall, with the pivot portion passing through the side end wall. The first side wall and the second side wall are opposite each other in the radial direction of the pivot portion, and the first side wall and the second side wall extend from the side end wall into the handle connector.

[0018] Optionally, the number of the rotating ridges is n, where n is an even number not less than 6, and each rotating ridge is paired up in opposite directions on the radial side of the rotating shaft.

[0019] Optionally, the first side and the second side are parallel to the rotation axis of the handle; the circumferential surface of the pivot portion includes a plurality of first planes, which are spaced apart in the circumferential direction of the pivot portion. The outer surface of each anti-rotation protrusion is arc-shaped and connected between two first planes respectively. The plurality of first planes are parallel to each other, with each pair of two first planes that are opposite to each other in the radial direction of the pivot portion forming a pair. Without any external force being applied to the handle, the handle can be kept in the folded position and the upright position.

[0020] Optionally, the vertical distance between each pair of first planes is less than the vertical distance between the first side and the second side. When the handle is held in the retracted position, the pivot part is loosely fitted with the pivot receiving frame opening; when the handle is held in the upright position, the pivot part is also loosely fitted with the pivot receiving frame opening.

[0021] Optionally, when the handle is in the retracted position, one of the pair of first planes abuts against the first side and the other abuts against the second side; when the handle is in the upright position, one of the pair of first planes abuts against the first side and the other abuts against the second side.

[0022] Optionally, the rotating shaft is provided with several peripheral sidewalls, which form a hollow polygonal tube surrounding the rotation axis of the handle, and the anti-rotation protrusion is formed by the corner formed by the intersection of two adjacent peripheral sidewalls.

[0023] Optionally, the handle may further include at least one support flange for supporting the pivot portion, the support flange protruding from the pivot portion in a direction away from the rotation axis of the handle.

[0024] Optionally, the handle connector is further provided with a relief groove corresponding to the support flange. When the support flange rotates with the rotating shaft, the handle connector avoids the support flange by means of the relief groove.

[0025] Optionally, a cover is also provided, which is installed on the handle connector, and the support flange is at least partially received in the handle connector. The relief groove forms a through groove that passes through the inner and outer sides of the handle connector. The cover is located on the outside of the handle connector and covers the relief groove.

[0026] Optionally, the handle connector has side end walls at opposite ends, and a top wall is provided. The top wall is connected between the side end wall of one end and the side end wall of the other end of the handle connector. The pivot portion passes through the side end wall, the clearance groove is opened in the top wall, and the cover covers the top wall.

[0027] Optionally, the outer peripheral surface of the support flange away from the rotation axis of the handle constitutes the external contact surface of the support flange, and the support flange is a semi-annular piece disposed on the rotating shaft.

[0028] This patent application also provides a fan that includes the aforementioned handle device.

[0029] Optionally, it also includes a motor, a guide tube, and an impeller. The impeller can rotate under the drive of the motor. The impeller has several blades. The impeller is at least partially housed in the guide tube, which surrounds the rotation axis of the impeller. The handle device is installed and fixed to the guide tube.

[0030] Optionally, the handle is located on the outer periphery of the air guide tube, and the rotation axis of the handle is parallel to the rotation axis of the impeller.

[0031] Optionally, the handle is further provided with at least one support flange, which protrudes from the pivot portion along a direction away from the rotation axis of the handle. The support flange is used to support the air guide tube and space the pivot portion from the air guide tube. Under the support of the support flange, the pivot portion does not contact the air guide tube during the rotation of the handle.

[0032] Optionally, the handle connector is further provided with a relief groove corresponding to the support flange. When the support flange rotates with the rotating shaft, the handle connector avoids the support flange by means of the relief groove.

[0033] Optionally, a cover is also provided, which is installed on the handle connector, and the support flange is at least partially received in the handle connector. The clearance groove forms a through groove that passes through both the inner and outer sides of the handle connector. The cover covers the side of the handle connector opposite to the air duct and covers the clearance groove.

[0034] Optionally, the handle connector has side walls at opposite ends and a top wall. The top wall is connected between the side wall of one end and the side wall of the other end of the handle connector. The pivot part passes through the side wall and is located between the air guide and the top wall. The clearance groove is opened in the top wall and the cover is placed on the top wall.

[0035] Optionally, the cover extends to provide at least one locking screw post, the handle connecting seat provides at least one sleeve extending from the top wall, the locking screw post is inserted into the corresponding sleeve, the fan also provides at least one screw corresponding to the locking screw post, the screw passes through the wall of the air guide tube from the inside of the air guide tube and is screwed and fixed to the corresponding locking screw post, the end of the sleeve abuts against the air guide tube, and the end of the screw that passes through the locking screw post is not visible.

[0036] Optionally, the support flange contacts the air guide tube through its outer peripheral surface away from the rotation axis of the handle. During the rotation of the support flange along with the rotating shaft, sliding friction occurs between the outer peripheral surface of the support flange and the air guide tube.

[0037] Optionally, the outer peripheral surface of the supporting flange is arc-shaped, the curvature of the outer peripheral surface of the supporting flange is not less than 1π, and the supporting flanges are spaced apart in the axial direction of the rotating shaft.

[0038] Optionally, the air guide duct has a cylindrical body and a flared mouth portion that guides airflow into the cylindrical body. The flared mouth portion is located on the air inlet side of the air guide duct and is connected to one end of the cylindrical body portion. The flared mouth portion is a closed loop and the flared end of the flared mouth portion is located on the side of the flared mouth portion away from the cylindrical body portion. The handle device is installed on the cylindrical body portion.

[0039] Optionally, the flared mouth and the cylindrical body are coaxial, the flared mouth and the cylindrical body are formed from the same piece of metal, the flared mouth has the rotation axis of the impeller as the central axis, the axial section of the flared mouth is arc-shaped, and the angle of the arc of the axial section of the flared mouth is not greater than 79 degrees and not less than 61 degrees.

[0040] Optionally, the cylindrical body is a cylindrical shape with the rotation axis of the impeller as the central axis, the radius of curvature of the axial section of the flared mouth is not greater than 28.7 mm and not less than 22.9 mm, and the inner circumferential surface of the flared mouth is tangentially connected to the inner circumferential surface of the cylindrical body.

[0041] Optionally, the air guide duct has an outlet side rolled edge and an inlet side rolled edge. The outlet side rolled edge is connected to the duct body. The flared mouth, the duct body, and the outlet side rolled edge are respectively arranged around the rotation axis of the impeller. The inlet side rolled edge is connected to the flared end of the flared mouth and is arranged around the flared mouth.

[0042] Optionally, it also includes an outlet-side protective grille and several third screws for securing the outlet-side protective grille. The air guide tube has an outlet-side rolled edge, which has several locking screw holes corresponding to the third screws. The outlet-side rolled edge has a second plane, which surrounds the rotation axis of the impeller and is located on the side of the outlet-side rolled edge that is relatively far from the flared end. The locking screw holes penetrate the second plane. The outlet-side protective grille also has several second fixing feet for fixing the outlet-side protective grille. The third screws are screwed into the corresponding locking screw holes to lock the corresponding second fixing feet to the outlet-side rolled edge, and the second fixing feet abut against the second plane.

[0043] Optionally, it also includes an outlet-side protective grille and several third screws for securing the outlet-side protective grille. The air guide duct is also provided with an outlet-side rolled edge. The flared mouth, the cylindrical body, and the outlet-side rolled edge are respectively arranged around the rotation axis of the impeller. The outlet-side rolled edge includes a curled part integrally connected to the cylindrical body and an annular wall integrally connected to the curled part. The curled part and the annular wall are respectively arranged around the rotation axis of the impeller. The curled part has several locking screw holes corresponding to the third screws. The annular wall is located on the side of the outlet-side rolled edge that is relatively close to the flared mouth. The annular wall surrounds the cylindrical body and does not contact the cylindrical body. The annular wall constitutes the free edge of the outlet-side rolled edge and is perpendicular to the rotation axis of the impeller.

[0044] Optionally, the curled portion includes a first arc portion with an arc-shaped axial cross section, a second arc portion with an arc-shaped axial cross section, and a second plane. The first arc portion is integrally connected to the cylinder portion, and the second arc portion is integrally connected to the annular wall. The first arc portion, the second plane, and the second arc portion respectively surround the rotation axis of the impeller. The second plane is connected between the outer surface of the first arc portion and the outer surface of the second arc portion. The second plane is located on the side of the curled edge on the air outlet side that is relatively close to the flared end and faces away from the annular wall. The second plane is parallel to the annular wall. The locking screw hole penetrates the second plane. The air outlet side protective grille is also provided with several second fixing feet for fixing the air outlet side protective grille. The third screw is screwed into the corresponding locking screw hole to lock the corresponding second fixing foot to the air outlet side curled edge. The second fixing foot abuts against the second plane.

[0045] Optionally, an air inlet side protective grille is also provided, which is housed within the cylindrical body, and the flared mouth portion and the air inlet side protective grille do not overlap in any direction perpendicular to the rotation axis of the impeller.

[0046] Optionally, the air inlet side protective grille is provided with an outer ring and an inner ring respectively formed by metal wires, and a spiral disc formed by multiple turns of metal wires between the outer ring and the inner ring. The outer ring is a closed circular ring and constitutes the outermost ring of metal wires of the air inlet side protective grille, and the inner ring is a closed circular ring and constitutes the innermost ring of metal wires of the air inlet side protective grille. The inner ring and the outer ring are respectively around the rotation axis of the impeller, and the outer ring, the spiral disc, and the inner ring are located on the same plane perpendicular to the rotation axis of the impeller.

[0047] Optionally, an air inlet side protective grille is also provided. The air inlet side protective grille has a plurality of first fixing feet for fixing the air inlet side protective grille. The plurality of first fixing feet are distributed around the periphery of the air inlet side protective grille and extend toward the flared mouth. The plurality of first fixing feet and the flared mouth do not overlap in any direction perpendicular to the rotation axis of the impeller. The fan is also provided with a corresponding second screw and nut and a housing. The nut is located inside the cylindrical part and between the air inlet side protective grille and the flared mouth. The second screw passes through the cylindrical wall of the cylindrical part and the first fixing feet from the outside of the cylindrical part and is screwed to the nut. The first fixing feet are clamped between the nut and the cylindrical wall of the cylindrical part. The housing covers one side of the motor. The flared mouth surrounds the housing. The housing and the impeller are located on opposite sides of the air inlet side protective grille.

[0048] Optionally, the impeller is located inside the cylindrical body, which is a cylindrical shape with the rotation axis of the impeller as the central axis, and the radial distance between the farthest point of each blade relative to the rotation axis of the impeller and the inner circumferential surface of the cylindrical body is no more than 10 mm. [Attached Image Description]

[0049] Figure 1 This is a perspective view of the fan of this application;

[0050] Figure 2 Another perspective view of the fan in this application (with the handle connector and cover removed);

[0051] Figure 3 This is a perspective view of the handle device of this application;

[0052] Figure 4 This is a cross-sectional view of the handle of the handle device of this application (the section is perpendicular to the rotation axis of the handle);

[0053] Figure 5 This is an exploded view of the handle device of this application;

[0054] Figure 6 This is another exploded view of the handle device of this application;

[0055] Figure 7 An exploded view of the handle of the handle device of this application;

[0056] Figure 8 Another sectional view of the handle of the handle device of this application (the section is perpendicular to the rotation axis of the handle);

[0057] Figure 9 This is a perspective view of the air inlet side protective grille of the fan in this application;

[0058] Figure 10A vertical cross-sectional view of the fan of the present application (the cross-section is the vertical plane where the rotation axis of the impeller is located, and the air outlet side protective grille is not shown);

[0059] Figure 11 is Figure 10 a partial enlarged view of;

[0060] Figure 12 is Figure 10 another partial enlarged view of.

Specific Embodiment

[0061] Refer Figures 1 to 12 As shown, a handle device and a fan having the handle device are disclosed. The handle device includes a handle connecting seat 1 and a handle 2. The handle 2 is pivotally connected to the handle connecting seat 1 and can thus rotate relative to the handle connecting seat 1. The handle 2 is provided with a rotating shaft portion 20 and a handle grip 28. The handle 2 is pivotally connected to the handle connecting seat 1 by means of the rotating shaft portion 20. During the rotation of the handle 2, interference friction can occur between the rotating shaft portion 20 and the handle connecting seat 1; based on the interference friction occurring between the rotating shaft portion 20 and the handle connecting seat 1 during the rotation of the handle 2, the rotational resistance during the rotation of the handle 2 relative to the handle connecting seat 1 is increased, and the effect of rotational damping between the handle 2 and the handle connecting seat 1 is simply generated, which is relatively simple and practical. The handle connecting seat 1 and the handle 2 can be made of plastic material, and the handle connecting seat 1 is in the shape of a dumbbell.

[0062] The handle connecting seat 1 is provided with a rotating shaft receiving opening 10 that at least partially accommodates the rotating shaft portion 20. During the rotation of the handle 2, interference friction occurs between the rotating shaft portion 20 and the inner wall surface of the rotating shaft receiving opening 10, so that interference friction between the rotating shaft portion 20 and the handle connecting seat 1 can be achieved, which is simple, practical and easy to implement. During the rotation of the handle 2, along with the interference friction between the rotating shaft portion 20 and the inner wall surface of the rotating shaft receiving opening 10, the rotating shaft receiving opening 10 is enlarged by the rotating shaft portion 20; after the interference friction, the rotating shaft receiving opening 10 returns to its original state. \n

[0063] The rotating shaft receiving openings 10 are respectively provided at opposite ends of the handle connecting seat 1 in the direction of the rotation axis of the handle 2. The rotation axis of the handle 2 is the rotation axis when the handle 2 rotates relative to the handle connecting seat 1. The rotating shaft portion 20 penetrates from one end to the other end of the opposite ends of the handle connecting seat 1 in the direction of the rotation axis of the handle 2. The rotating shaft portion 20 is parallel to the handle grip 28, and the handle connecting seat 1 covers the rotating shaft portion 20. With such a design, the connection reliability between the handle 2 and the handle connecting seat 1 is good, which is beneficial to making the rotational resistance of the handle 2 more balanced. In this embodiment, the handle 2 is in the shape of a square frame, and the handle 2 is formed by combining an upper half shell 21 and a lower half shell 22. The upper half shell 21 and the lower half shell 22 are snap-fitted together by a snap mechanism 23 and are further locked together by screws (not shown, and the screws are locked at the screw locking positions 29).

[0064] The pivot section 20 is provided with several anti-rotation protrusions 24. During the rotation of the handle 2, the pivot section 20 interferes with and rubs against the handle connecting seat 1 with the anti-rotation protrusions 24. The anti-rotation protrusions 24 constitute a damping structure for the rotation of the handle 2 relative to the handle connecting seat 1, which is simple, practical and easy to implement. When the rotation axis of the handle 2 is in a basically horizontal state, the anti-rotation protrusions 24 prevent the upright handle 2 from automatically and quickly rotating back under the weight of the handle 2. During the rotation of the handle 2, the pivot section 20 interferes with and rubs against the inner wall surface of the pivot receiving frame 10 with the anti-rotation protrusions 24.

[0065] The inner wall surface of the rotating shaft receiving frame 10 includes a first side surface 110 and a second side surface 111 located on opposite sides of the rotating shaft portion 20. During the rotation of the handle 2, one of the anti-rotation protrusions 24 interferes with the first side surface 110, and another anti-rotation protrusion 24 interferes with the second side surface 111, thereby promoting a more balanced interference friction between the rotating shaft portion 20 and the inner wall surface of the rotating shaft receiving frame 10. The plurality of anti-rotation protrusions 24 are distributed at intervals in the circumferential direction of the rotating shaft portion 20; two anti-rotation protrusions 24 that are opposite each other in the radial direction of the rotating shaft portion 20 form a pair. During the rotation of the handle 2, one of the pair of anti-rotation protrusions 24 interferes with the first side surface 110, and the other interferes with the second side surface 111.

[0066] The first side 110 and the second side 111 are radially opposite each other in the pivot portion 20. The inner wall of the pivot receiving frame opening 10 also includes an arcuate surface 12 protruding away from the pivot portion 20. The arcuate surface 12 connects the first side 110 and the second side 111. At least a portion of the first side 110, the arcuate surface 12, and at least a portion of the second side 111 form an arch that straddles the pivot portion 20.

[0067] The handle connector 1 also has a first sidewall 130 and a second sidewall 131 located on opposite sides of the pivot portion 20. The pivot receiving frame 10 is formed between the first sidewall 130 and the second sidewall 131. The first sidewall 110 forms a surface of the first sidewall 130 facing the second sidewall 131, and the second sidewall 111 forms a surface of the second sidewall 131 facing the first sidewall 130. During the rotation of the handle 2, the anti-rotation protrusion 24 interferes with the inner wall surface of the pivot receiving frame 10, and the gap between the first sidewall 130 and the second sidewall 131 is widened under the pressure of the anti-rotation protrusion 24; after the interference friction, the gap between the first sidewall 130 and the second sidewall 131 returns to its original position.

[0068] The rotating shaft 20 is a hollow tube. During the rotation of the handle 2, the rotating shaft 20 interferes with the inner wall of the rotating shaft receiving frame 10, and the rotating shaft 20 deforms under the pressure of the first side wall 130 and the second side wall 131. After the interference friction, the rotating shaft 20 returns to its original shape. The rotating shaft 20 is a hollow tube, which makes it more deformable under external pressure, which is beneficial for the adaptive compression deformation of the rotating shaft 20 when there is interference friction between the rotating shaft 20 and the handle connecting seat 1.

[0069] The handle connector 1 is also provided with a side end wall 14, and the pivot portion 20 passes through the side end wall 14. The first side wall 130 and the second side wall 131 are opposite each other in the radial direction of the pivot portion 20. The first side wall 130 and the second side wall 131 extend from the side end wall 14 into the handle connector 1. The arc-shaped surface 12 is provided on the side end wall 14.

[0070] The number of pivot-damping protrusions 24 is n, where n is an even number not less than 6. Each pivot-damping protrusion 24 is paired up and faces away from each other in the radial direction of the rotating shaft portion 20. In this embodiment, there are 6 pivot-damping protrusions 24, which are basically evenly distributed in the circumferential direction of the rotating shaft portion 20.

[0071] The first side 110 is parallel to the second side 111 and parallel to the rotation axis of the handle 2; the outer surface of the anti-rotation protrusion 24 is arc-shaped, so that the anti-rotation protrusion 24 can slide more smoothly when interference friction occurs. The outer peripheral surface of the rotating shaft 20 includes a plurality of first planes 25. The plurality of first planes 25 are distributed at intervals in the circumferential direction of the rotating shaft 20. The outer surface of each anti-rotation protrusion 24 is respectively connected between two first planes 25. Each pair of first planes 25 that are opposite to each other in the radial direction of the rotating shaft 20 is a pair. Each pair of first planes 25 is parallel. Without the manual application of external force to the handle 2, the handle 2 can be kept in the folded position and the upright position.

[0072] It can be designed such that the vertical distance between each pair of first planes 25 is less than the vertical distance between the first side 110 and the second side 111. When the handle 2 is in the retracted position, the pivot 20 is loosely fitted with the pivot receiving frame 10; when the handle 2 is in the upright position, the pivot 20 is also loosely fitted with the pivot receiving frame 10. With this design, the pivot 20 and the pivot receiving frame 10 can have intermittent interference friction during the rotation of the handle 2. Alternatively, it can be designed such that the vertical distance between each pair of first planes 25 is approximately equal to the vertical distance between the first side 110 and the second side 111. When the handle 2 is in the retracted position, one of the pair of first planes 25 is against the first side 110, and the other is against the second side 111; when the handle 2 is in the upright position, one of the pair of first planes 25 is against the first side 110, and the other is against the second side 111. This design facilitates a tighter fit between the pivot 20 and the pivot receiving frame 10.

[0073] The rotating shaft portion 20 is provided with several peripheral sidewalls 26, which form a hollow polygonal tube surrounding the rotation axis of the handle 2. The anti-rotation protrusion 24 is formed by the corners formed by the intersection of two adjacent peripheral sidewalls 26, thus realizing the direct use of each corner of the polygonal tube as the anti-rotation protrusion 24, which is simple and practical. In this embodiment, the rotating shaft portion 20 is a hexagonal tube. The first plane 25 belongs to the outer surface of the corresponding peripheral sidewall 26.

[0074] The handle 2 also has at least one support flange 27 for supporting the pivot portion 20. The support flange 27 protrudes from the pivot portion 20 in a direction away from the rotation axis of the handle 2. The support flange 27 supports the pivot portion 20 and prevents unnecessary contact between the pivot portion 20 and other objects. The handle connector 1 also has a relief groove 15 corresponding to the support flange 27. When the support flange 27 rotates with the pivot portion 20, the handle connector 1 avoids the support flange 27 by means of the relief groove 15, thereby not hindering the rotation of the support flange 27. The handle assembly also includes a cover 3, which is installed on the handle connector 1. The support flange 27 is at least partially housed within the handle connector 1. The handle connector 1 covers the support flange 27 and the pivot portion 20. The clearance groove 15 forms a through groove that passes through both the inner and outer sides of the handle connector 1. The cover 3 is located on the outer side of the handle connector 1 and covers the clearance groove 15, thereby preventing the clearance groove 15 and the support flange 27 from being exposed and avoiding water or other foreign matter from leaking into the inner side of the handle connector 1 through the clearance groove 15. The clearance groove 15 is elongated.

[0075] The handle connector 1 has side end walls 14 at opposite ends, and a top wall 16 at the top end. The top wall 16 connects the side end wall 14 at one end of the handle connector 1 to the side end wall 14 at the other end. The pivot 20 passes through the side end wall 14, and a clearance groove 15 is formed in the top wall 16. The cover 3 covers the top wall 16. The outer peripheral surface 270 of the support flange 27, which is away from the rotation axis of the handle 2, constitutes the external contact surface of the support flange 27.

[0076] In addition to the aforementioned handle device, the fan also includes a motor 40, an air guide tube 5, and an impeller 41. The impeller 41 can rotate under the drive of the motor 40. The impeller 41 has a plurality of blades 410. The impeller 41 is at least partially housed in the air guide tube 5, which surrounds the rotation axis A of the impeller 41. The handle device is mounted and fixed to the air guide tube 5. The handle device is located on the outer periphery of the air guide tube 5, and the rotation axis of the handle 2 is parallel to the rotation axis A of the impeller 41.

[0077] The fan also includes a bracket 42 supporting the air guide tube 5 and a rotatable first wheel 430 for moving the fan. The bracket 42 is U-shaped, and the air guide tube 5 is pivotally connected to the bracket 42. The axis of rotation of the air guide tube 5 relative to the bracket 42 is perpendicular to the axis of rotation of the first wheel 430. The axis of rotation of the first wheel 430 is a horizontal line. The first wheel 430 is mounted on the bracket 42, and the air guide tube 5 can rotate 360 ​​degrees relative to the bracket 42. The fan also includes a rotatable second wheel 431 for moving the fan. The second wheel 431 is mounted on the bracket 42, and the axis of rotation of the second wheel 431 is perpendicular to the axis of rotation of the first wheel 430 so that the fan can turn by means of the second wheel 431 when moving.

[0078] The aforementioned support flange 27 is used to support the air duct 5 and space the rotating shaft 20 from the air duct 5. Under the support of the support flange 27, the rotating shaft 20 does not contact the air duct 5 during the rotation of the handle 2. The cover 3 covers the side of the handle connecting seat 1 that is opposite to the air duct 5 and covers the clearance groove 15. The rotating shaft 20 is located between the air duct 5 and the top wall 16. The first side wall 130 and the second side wall 131 extend from the top wall 16 to the air duct 5, respectively. The cover 3 extends with at least one locking screw post 30, and the handle connecting seat 1 is also provided with at least one sleeve 17 extending from the top wall 16. The locking screw post 30 is inserted into the corresponding sleeve 17. The fan is also provided with at least one first screw 44 corresponding to the locking screw post 30. The first screw 44 passes through the wall of the air guide 5 from the inside and is screwed and fixed to the corresponding locking screw post 30. The end of the sleeve 17 presses against the air guide 5. The end of the first screw 44 that penetrates the locking screw post 30 is not visible (i.e., not visible from any angle). With this design, the end of the first screw 44 that penetrates the locking screw post 30 is not easily corroded, and the visual effect is better.

[0079] The support flange 27 contacts the air guide tube 5 through its outer peripheral surface 270, which is away from the rotation axis of the handle 2. During the rotation of the shaft portion 20, sliding friction occurs between the outer peripheral surface 270 of the support flange 27 and the air guide tube 5. The support flange 27 is plate-shaped, and its outer peripheral surface 270 is arc-shaped, thus reducing the contact area between the handle 2 and the air guide tube 5 during rotation and weakening the influence of the air guide tube 5 on the rotation of the support flange 27. The curvature of the outer peripheral surface 270 of the support flange 27 is not less than 1π, thus allowing for a wider range of rotation angles for the handle 2. The support flanges 27 are spaced apart axially on the shaft portion 20 for more balanced support. In this embodiment, two support flanges 27 are distributed on the left and right sides of the shaft portion 20. For the fan of this embodiment… Figure 1 , Figure 2 , Figure 3 The handles 2 shown are all in the retracted position. In the retracted position, the handles 2 are lowered and placed as close to the edge as possible. The handles 2 can be rotated 90 degrees from the retracted position to the upright position, making it easier for the hand to grip. In this embodiment, the curvature of the outer peripheral surface 270 of the supporting flange 27 is about 1π. When the handles 2 are in the upright position, the middle part of the outer peripheral surface 270 of the supporting flange 27 rests on the air guide tube 5. When the handles 2 are in the retracted position, one end of the opposite ends of the outer peripheral surface 270 of the supporting flange 27 rests on the air guide tube 5. After the handles 2 are rotated 180 degrees from the retracted position, the other end of the opposite ends of the outer peripheral surface 270 of the supporting flange 27 rests on the air guide tube 5.

[0080] The air guide duct 5 includes a cylindrical body 50 and a flared mouth 51 that guides airflow into the cylindrical body 50. The flared mouth 51 is a closed-loop ring and is coaxial with the cylindrical body 50. The flared mouth 51 is located on the air inlet side of the air guide duct 5 and is connected to one end of the cylindrical body 50. A handle device is installed on the cylindrical body 50. The flared mouth 51 is a closed-loop ring, and the flared end of the flared mouth 51 (i.e., the end with the larger diameter of the two opposite ends of the flared mouth 51) is located on the side of the flared mouth 51 away from the cylindrical body 50. The diameter of the flared mouth 51 gradually increases as it moves away from the cylindrical body 50. The flared mouth 51 and the cylindrical body 50 are made of the same metal sheet. The flared section 51 is formed with an arc-shaped axial section, and the angle B of the arc formed by the flared section 51 is not greater than 79 degrees and not less than 61 degrees. Since the angle B of the arc formed by the flared section 51 is not less than 61 degrees, the opening angle of the flared section 51 is sufficiently large, improving its ability to guide and concentrate air into the cylinder section 50. Furthermore, the fact that the angle B of the arc formed by the flared section 51 is not greater than 79 degrees effectively reduces the probability of cracking during the forming of the flared section 51, improving its manufacturing yield. In summary, both the air guiding performance and the manufacturing yield of the flared section 51 are considered. The flared section 51 has the rotation axis A of the impeller 41 as its central axis, and the axial section involved in this application is a cross-section formed by the plane containing the rotation axis A of the impeller 41.

[0081] The axial section of the flared mouth portion 51 is arc-shaped, and the radius of curvature R of the axial section of the flared mouth portion 51 is not greater than 28.7 mm and not less than 22.9 mm, for example, 25.8 mm. This design, based on the arc angle B of the flared mouth portion 51 being not greater than 79 degrees and not less than 61 degrees, further controls the radius of curvature R of the flared mouth portion 51 to be not greater than 28.7 mm and not less than 22.9 mm, thereby further balancing the air guiding performance and molding yield of the flared mouth portion 51. In this embodiment, the wall thickness of the flared mouth portion 51 is very thin, approximately 0.8 mm. To eliminate the influence of the wall thickness of the flared mouth portion 51 on the measurement of various parameters (angle B, radius of curvature R, etc.), the measurement of each parameter (angle B, radius of curvature R, etc.) of the flared mouth portion 51 uses the inner circumferential surface 510 of the flared mouth portion 51 as a reference plane to measure and obtain the above parameters.

[0082] The air guide duct 5 is centered on the rotation axis A of the impeller 41. The fan is also equipped with an inlet-side protective grille 6 and an outlet-side protective grille 7. The inlet-side protective grille 6 and the bell mouth 51 do not overlap in any direction perpendicular to the rotation axis A of the impeller 41. This design prevents the inlet-side protective grille 6 from affecting the air guiding and concentrating of the bell mouth 51. The inlet-side protective grille 6 is completely located inside the duct body 50. The air inlet side protective grille 6 has an inner ring 60 made of coiled metal wire, an outer ring 61 made of coiled metal wire, and a spiral coil 62 formed by multiple turns of coiled metal wire between the inner ring 60 and the outer ring 61. The inner ring 60 is a closed circular ring and constitutes the innermost coil of metal wire in the air inlet side protective grille 6, and the outer ring 61 is a closed circular ring and constitutes the outermost coil of metal wire in the air inlet side protective grille 6. The inner ring 60 and the outer ring 61 are centered on the rotation axis A of the impeller 41. The inner ring 60, the spiral coil 62, and the outer ring 61 are all located on the same plane perpendicular to the rotation axis A of the impeller 41. In this embodiment, the spiral coil 62 is formed by coiling a single metal wire. The metal wire of the spiral coil 62 spirals from the outer periphery of the inner ring 60 to the inner periphery of the outer ring 61. The thickness of the metal wire in the inner ring 60 is approximately the same as that in the outer ring 61, and both are greater than the thickness of the metal wire in the spiral coil 62.

[0083] The fan is also provided with corresponding second screws 450 and nuts 451, and housing 46. The air inlet side protective grille 6 is also provided with a plurality of first fixing feet 63 for fixing the air inlet side protective grille 6. The plurality of first fixing feet 63 are distributed around the air inlet side protective grille 6. The nut 451 is located inside the cylinder part 50 and between the air inlet side protective grille 6 and the flared part 51. The second screw 450 passes through the cylinder wall of the cylinder part 50 and the first fixing feet 63 from outside the cylinder part 50 and is screwed to the nut 451. The first fixing feet 63 are clamped between the nut 451 and the cylinder wall of the cylinder part 50. The plurality of first fixing feet 63 and the flared part 51 do not overlap in any direction perpendicular to the rotation axis A of the impeller 41. The plurality of first fixing feet 63 extend toward the flared part 51 respectively. The housing 46 covers one side of the motor 40. The housing 46 and the impeller 41 are located on opposite sides of the air inlet side protective grille 6. The flared part 51 surrounds the housing. The arrangement of the first fixing foot 63, nut 451, and housing 46 not only facilitates the operation of the second screw 450 and nut 451 to lock the first fixing foot 63 to the cylinder 50, but also promotes a greater distance between the air inlet side protective grille 6 and the outer edge of the air inlet side of the air guide tube 5, thus providing more space. This allows the housing 46 and other components to be more fully housed inside the air guide tube 5, which is beneficial for miniaturizing the fan's packaging size. In this embodiment, the housing 46 hardly extends beyond the outer edge of the air inlet side of the air guide tube 5. The first fixing foot 63 is U-shaped, and there are 6 first fixing feet 63. The first fixing feet 63 are attached to the inner circumferential surface 500 of the cylinder 50.

[0084] The inner circumferential surface 510 of the flared nozzle 51 is tangentially and smoothly connected to the inner circumferential surface 500 of the cylindrical body 50. The cylindrical body 50 is cylindrical, with the rotation axis A of the impeller 41 as its central axis. The impeller 41 is located inside the cylindrical body 50, and the radial distance between the farthest point of each fan blade 410 relative to the rotation axis A of the impeller 41 and the inner circumferential surface 500 of the cylindrical body 50 is no greater than 10 mm. Under the condition of the flared nozzle 51 configured in this air guide duct 5, combined with the radial distance being less than or equal to 10 mm, the jet velocity of this fan is promoted to increase; the radial distance mentioned above refers to the radial direction of the cylindrical body 50; the aforementioned radial distance is greater than or equal to 3 mm.

[0085] The air guide duct 5 is provided with an air inlet side rolled edge 52 and an air outlet side rolled edge 53. The air inlet side rolled edge 52 is connected to the flared end of the horn mouth portion 51, and the air outlet side rolled edge 53 is connected to the cylinder body portion 50. The horn mouth portion 51, the cylinder body portion 50, and the air outlet side rolled edge 53 are respectively arranged around the rotation axis A of the impeller 41. The horn mouth portion 51, the cylinder body portion 50, and the air outlet side rolled edge 53 are coaxial. The air inlet side rolled edge 52 is arranged around the horn mouth portion 51. The axial section of the air inlet side rolled edge 52 is arc-shaped, and the radius of curvature of the axial section of the air inlet side rolled edge 52 is about 2.25 mm.

[0086] The fan also includes several third screws 47 for securing the exhaust side protective grille 7. The exhaust side rolled edge 53 includes a rolled portion 530 integrally connected to the cylindrical body 50 and an annular wall 531 integrally connected to the rolled portion 530. The rolled portion 530 and the annular wall 531 respectively surround the rotation axis A of the impeller 41. The annular wall 531 is located on the side of the exhaust side rolled edge 53 that is relatively close to the flared end. The annular wall 531 surrounds the cylindrical body 50 and does not contact the cylindrical body 50. The annular wall 531 forms the free edge of the exhaust side rolled edge 53 and is perpendicular to the rotation axis of the impeller 41. This design improves the appearance of the exhaust side rolled edge 53 and also helps to improve the consistency of the molding. The distance L between the annular wall 531 and the cylindrical body 50 can be selected between 4.4 mm and 5.2 mm.

[0087] The curled portion 530 includes a second plane 5300, a first arc portion 5301 with an arcuate axial cross-section, and a second arc portion 5302 with an arcuate axial cross-section. The second plane 5300 connects the outer surfaces of the first arc portion 5301 and the second arc portion 5302. The annular wall 531 extends from the second arc portion 5302 toward the cylindrical portion 50. The first arc portion 5301, the second plane 5300, and the second arc portion 5302 respectively surround the rotation axis A of the impeller 41. The second plane 5300 is perpendicular to the rotation axis A of the impeller 41 and is part of the outer surface of the outlet side curled edge 53. The second plane 5300 faces away from the annular wall 531 and is parallel to the annular wall 531. The curled portion 530 has a plurality of locking screw holes 5303 corresponding to the third screw 47. The plurality of locking screw holes 5303 are evenly distributed on the curled portion 530 and pass through the second plane 5300 respectively. The air outlet side protective grille 7 is also provided with a plurality of second fixing feet 70 for fixing the air outlet side protective grille 7. The third screw 47 passes through the corresponding second fixing foot 70 and is screwed into the corresponding locking screw hole 5303 to lock the corresponding second fixing foot 70 to the air outlet side curled edge 53. The second fixing foot 70 abuts against the second plane 5300. The existence of the second plane 5300 helps to increase the contact area between the second fixing foot 70 and the air outlet side curled edge 53, and enhances the stability of fixing the second fixing foot 70. The first arc portion 5301 is integrally connected to the cylindrical body portion 50, and the second arc portion 5302 is integrally connected to the annular wall 531. The first arc portion 5301 is tangent to the cylindrical body portion 50. In this embodiment, there are six locking screw holes 5303 and six second fixing feet 70. The radius of curvature of the axial section of the first arc portion 5301 (between 6.1 mm and 7.1 mm) is equal to the radius of curvature of the axial section of the second arc portion 5302.

Claims

1. A fan comprising a handle arrangement, the handle arrangement comprising a handle attachment, a handle, the handle being pivotally connected to the handle attachment so as to be rotatable relative to the handle attachment, characterised in that: The handle is provided with a pivot portion, and the handle is pivotally connected to the handle connecting seat by means of the pivot portion. During the rotation of the handle, the pivot portion may interfere with and rub against the handle connecting seat. The handle connector is provided with a shaft receiving frame opening that at least partially accommodates the shaft portion; The handle connector is also provided with a first sidewall and a second sidewall located on opposite sides of the pivot portion, and the pivot receiving frame opening is formed between the first sidewall and the second sidewall. The rotating shaft is a hollow tube. During the rotation of the handle, the rotating shaft interferes with the inner wall of the rotating shaft receiving frame, and the rotating shaft deforms under the pressure of the first side wall and the second side wall. After the interference friction, the rotating shaft returns to its original shape. The fan also includes a motor, an air guide tube, and an impeller. The impeller can rotate under the drive of the motor. The air guide tube surrounds the rotation axis of the impeller, and the handle device is located on the outer periphery of the air guide tube.

2. The fan of claim 1, wherein: The handle also has at least one support flange for supporting the pivot portion, the support flange protruding from the pivot portion in a direction away from the rotation axis of the handle.

3. The fan of claim 1, wherein: The handle connector is provided with a rotating shaft receiving frame at opposite ends in the direction of the rotation axis of the handle. The rotating shaft extends from one end of the handle connector to the other end in the direction of the rotation axis of the handle, and the handle connector covers the rotating shaft.

4. The fan of claim 1, wherein: The rotating shaft extends through the rotating shaft receiving frame. During the rotation of the handle, the rotating shaft receives the frame by the rotating shaft due to interference friction between the rotating shaft and the inner wall of the rotating shaft receiving frame. After the interference friction, the rotating shaft receives the frame returns to its original shape.

5. The fan of claim 1, wherein: The rotating shaft is provided with several anti-rotation protrusions. During the rotation of the handle, the rotating shaft interferes with and rubs against the handle connecting seat by means of the anti-rotation protrusions.

6. The fan of claim 5, wherein: During the rotation of the handle, the pivot part interferes with and rubs against the inner wall surface of the pivot receiving frame through the anti-rotation protrusion.

7. The fan of claim 6, wherein: The inner wall of the rotating shaft receiving frame includes a first side and a second side located on opposite sides of the rotating shaft. During the rotation of the handle, one of the anti-rotation protrusions interferes with and rubs against the first side, and another anti-rotation protrusion interferes with and rubs against the second side.

8. The fan of claim 7, wherein: The plurality of anti-rotation protrusions are distributed at intervals in the circumferential direction of the rotating shaft, with two anti-rotation protrusions that are opposite each other in the radial direction of the rotating shaft forming a pair. During the rotation of the handle, one of the pair of anti-rotation protrusions interferes with and rubs against the first side surface, and the other interferes with and rubs against the second side surface.

9. The fan of claim 7, wherein: The first side and the second side are radially opposite each other at the pivot. The inner wall of the pivot receiving frame also includes an arcuate surface that protrudes away from the pivot. The arcuate surface connects the first side and the second side. At least a portion of the first side, the arcuate surface, and at least a portion of the second side are connected to form an arch that straddles the pivot.

10. The fan of claim 7, wherein: When the handle is in the retracted position, the pivot part is loosely fitted with the pivot receiving frame opening; when the handle is in the upright position, the pivot part is also loosely fitted with the pivot receiving frame opening; the first side surface forms a surface of the first side wall facing the second side wall, and the second side surface forms a surface of the second side wall facing the first side wall.

11. The fan of claim 7, wherein: During the rotation of the handle, the interference friction between the anti-rotation protrusion and the inner wall of the rotating shaft receiving frame causes the gap between the first and second side walls to widen under the pressure of the anti-rotation protrusion. After the interference friction, the distance between the first sidewall and the second sidewall is restored.

12. The fan of claim 1, wherein: When the handle is in the retracted position, the pivot part is loosely fitted with the pivot receiving frame; when the handle is in the upright position, the pivot part is also loosely fitted with the pivot receiving frame.

13. The fan of claim 1, wherein: The handle connector also has a side end wall, and the pivot portion passes through the side end wall. The first side wall and the second side wall are opposite each other in the radial direction of the pivot portion, and the first side wall and the second side wall extend from the side end wall into the handle connector.

14. The fan of claim 7, wherein: The number of the rotating ridges is n, where n is an even number not less than 6, and each rotating ridge is paired up in opposite directions on the radial side of the rotating shaft.

15. The fan of claim 7, wherein: The first side is parallel to the second side and parallel to the rotation axis of the handle; the circumferential surface of the pivot includes a plurality of first planes, which are spaced apart in the circumferential direction of the pivot. The outer surface of each anti-rotation protrusion is arc-shaped and connected between two first planes respectively. Each pair of first planes that are opposite to each other in the radial direction of the pivot is a pair, and each pair of first planes is parallel. Without the application of external force to the handle, the handle can be kept in the folded position and the upright position.

16. The fan of claim 15, wherein: The vertical distance between each pair of first planes is less than the vertical distance between the first side and the second side. When the handle is in the retracted position, the pivot part is loosely fitted with the pivot receiving frame opening; when the handle is in the upright position, the pivot part is also loosely fitted with the pivot receiving frame opening.

17. The fan of claim 15, wherein: When the handle is in the retracted position, one of the pair of first planes is against the first side and the other is against the second side; when the handle is in the upright position, one of the pair of first planes is against the first side and the other is against the second side.

18. The fan of claim 5, wherein: The rotating shaft is provided with several peripheral sidewalls, which form a hollow polygonal tube surrounding the rotation axis of the handle. The anti-rotation protrusion is formed by the corner formed by the intersection of two adjacent peripheral sidewalls.

19. A fan comprising a handle arrangement, the handle arrangement comprising a handle connector, a handle, the handle being pivotally connected to the handle connector so as to be rotatable relative to the handle connector, characterised in that: The handle is provided with a pivot portion, and the handle is pivotally connected to the handle connecting seat by means of the pivot portion. During the rotation of the handle, the pivot portion may interfere with and rub against the handle connecting seat. The handle connector is provided with a shaft receiving frame opening that at least partially accommodates the shaft portion; During the rotation of the handle, the pivot part interferes with and rubs against the inner wall surface of the pivot receiving frame. The handle is further provided with at least one support flange for supporting the pivot portion, the support flange protruding from the pivot portion in a direction away from the rotation axis of the handle; the outer peripheral surface of the support flange away from the rotation axis of the handle constitutes the external contact surface of the support flange. The fan also includes a motor, an air guide tube, and an impeller. The impeller can rotate under the drive of the motor, and the air guide tube surrounds the rotation axis of the impeller. The handle is located on the outer periphery of the air duct; The support flange is used to support the air guide tube and separate the rotating shaft from the air guide tube. With the support of the support flange, the rotating shaft does not contact the air guide tube during the rotation of the handle. The support flange contacts the air guide tube through its outer peripheral surface, which is away from the rotation axis of the handle. As the support flange rotates with the rotating shaft, sliding friction occurs between the outer peripheral surface of the support flange and the air guide tube.

20. The fan of claim 19, wherein: The handle connector is also provided with a clearance groove corresponding to the support flange. When the support flange rotates with the rotating shaft, the handle connector avoids the support flange by means of the clearance groove.

21. The fan of claim 20, wherein: It also includes a cover, which is installed on the handle connector, and the support flange is at least partially housed within the handle connector. The clearance groove forms a through groove that passes through both the inner and outer sides of the handle connector. The cover is located on the outer side of the handle connector and covers the clearance groove.

22. The fan of claim 21, wherein: The handle connector has side walls at opposite ends and a top wall. The top wall is connected between the side wall of one end and the side wall of the other end of the handle connector. The pivot part passes through the side wall. The clearance groove is opened in the top wall. The cover is placed on the top wall.

23. The fan of claim 19, wherein: The support flange is a semi-annular piece disposed on the rotating shaft.

24. The fan of claim 19, wherein: The rotating shaft is a hollow tube.

25. The fan of claim 19, wherein: The impeller has several blades, and at least part of the impeller is housed in the air guide tube.

26. The fan of claim 25, wherein: The rotation axis of the handle is parallel to the rotation axis of the impeller.

27. The fan according to claim 25, characterized in that: The handle device is installed and fixed to the air duct.

28. The fan of claim 19, wherein: The fan is also equipped with an air inlet side protective grille and an air outlet side protective grille; the air guide tube is equipped with a cylindrical body and a flared mouth part that guides the airflow into the cylindrical body, and the flared mouth part is located on the air inlet side of the air guide tube.

29. The fan of claim 20, wherein: It also includes a cover, which is installed on the handle connector. The support flange is at least partially housed within the handle connector. The clearance groove forms a through groove that passes through both the inner and outer sides of the handle connector. The cover covers the side of the handle connector opposite to the air duct and also covers the clearance groove.

30. The fan of claim 29, wherein: The handle connector has side walls at opposite ends and a top wall. The top wall is connected between the side wall of one end and the side wall of the other end of the handle connector. The pivot part passes through the side wall and is located between the air guide and the top wall. The clearance groove is opened in the top wall and the cover is placed on the top wall.

31. The fan of claim 30, wherein: The cover extends with at least one locking screw post, and the handle connecting seat has at least one sleeve extending from the top wall. The locking screw post is inserted into the corresponding sleeve. The fan also has at least one screw corresponding to the locking screw post. The screw passes through the wall of the air guide tube from the inside and is screwed to the corresponding locking screw post. The end of the sleeve abuts against the air guide tube. The end of the screw that passes through the locking screw post is not visible.

32. The fan of claim 19, wherein: The handle device is installed on the cylindrical part of the air guide tube.

33. The fan of claim 19, wherein: The outer peripheral surface of the supporting flange is arc-shaped, and the supporting flange is a semi-annular piece disposed on the rotating shaft. The supporting flanges are spaced apart in the axial direction of the rotating shaft.

34. The fan of claim 19, wherein: The air guide duct has a cylindrical body and a flared mouth that guides airflow into the cylindrical body. The flared mouth is located on the air inlet side of the air guide duct and is connected to one end of the cylindrical body. The flared mouth is a closed loop. The flared end of the flared mouth is located on the side of the flared mouth away from the cylindrical body. The handle device is installed on the cylindrical body.

35. The fan of claim 34, wherein: The flared mouth and the cylindrical body are coaxial and are formed from the same piece of metal. The flared mouth has the rotation axis of the impeller as its central axis. The axial section of the flared mouth is arc-shaped, and the angle of the arc of the axial section of the flared mouth is not greater than 79 degrees and not less than 61 degrees.

36. The fan of claim 35, wherein: The cylindrical body is cylindrical with the rotation axis of the impeller as the central axis. The radius of curvature of the axial section of the flared mouth is not greater than 28.7 mm and not less than 22.9 mm. The inner circumferential surface of the flared mouth is tangential to and smoothly connected to the inner circumferential surface of the cylindrical body.

37. The fan of claim 34, wherein: The air guide duct has an air outlet rolled edge and an air inlet rolled edge. The air outlet rolled edge is connected to the duct body. The flared mouth, the duct body, and the air outlet rolled edge are respectively arranged around the rotation axis of the impeller. The air inlet rolled edge is connected to the flared end of the flared mouth and is arranged around the flared mouth.

38. The fan of claim 34, wherein: It also includes an outlet-side protective grille and several third screws for securing the outlet-side protective grille. The air guide tube has an outlet-side rolled edge, which has several locking screw holes corresponding to the third screws. The outlet-side rolled edge has a second plane, which surrounds the rotation axis of the impeller and is located on the side of the outlet-side rolled edge that is relatively far from the flared end. The locking screw holes penetrate the second plane. The outlet-side protective grille also has several second fixing feet for fixing the outlet-side protective grille. The third screws are screwed into the corresponding locking screw holes to lock the corresponding second fixing feet to the outlet-side rolled edge, and the second fixing feet abut against the second plane.

39. The fan of claim 34, wherein: It also includes an outlet-side protective grille and several third screws for securing the outlet-side protective grille. The air guide duct is also provided with an outlet-side rolled edge. The flared mouth, the cylindrical body, and the outlet-side rolled edge are respectively arranged around the rotation axis of the impeller. The outlet-side rolled edge includes a curled part integrally connected to the cylindrical body and an annular wall integrally connected to the curled part. The curled part and the annular wall are respectively arranged around the rotation axis of the impeller. The curled part has several locking screw holes corresponding to the third screws. The annular wall is located on the side of the outlet-side rolled edge that is relatively close to the flared mouth. The annular wall surrounds the cylindrical body and does not contact the cylindrical body. The annular wall constitutes the free edge of the outlet-side rolled edge and is perpendicular to the rotation axis of the impeller.

40. The fan of claim 39, wherein: The curled section includes a first arc portion with an arc-shaped axial cross section, a second arc portion with an arc-shaped axial cross section, and a second plane. The first arc portion is integrally connected to the cylinder body, and the second arc portion is integrally connected to the annular wall. The first arc portion, the second plane, and the second arc portion respectively surround the rotation axis of the impeller. The second plane is connected between the outer surface of the first arc portion and the outer surface of the second arc portion. The second plane is located on the side of the air outlet side curled edge that is relatively far from the flared end and faces away from the annular wall. The second plane is parallel to the annular wall. The locking screw hole penetrates the second plane. The air outlet side protective grille is also provided with several second fixing feet for fixing the air outlet side protective grille. The third screw is screwed into the corresponding locking screw hole to lock the corresponding second fixing foot to the air outlet side curled edge. The second fixing foot abuts against the second plane.

41. The fan of claim 34, wherein: It is also provided with an air inlet side protective grille, which is housed inside the cylindrical body. The flared mouth portion and the air inlet side protective grille do not overlap in any direction perpendicular to the rotation axis of the impeller.

42. The fan of claim 41, wherein: The air inlet side protective grille has an outer ring and an inner ring formed by metal wires, and a spiral coil formed by multiple turns of metal wires between the outer ring and the inner ring. The outer ring is a closed circular ring and constitutes the outermost ring of metal wires in the air inlet side protective grille, and the inner ring is a closed circular ring and constitutes the innermost ring of metal wires in the air inlet side protective grille. The inner and outer rings are respectively encircled by the rotation axis of the impeller, and the outer ring, the spiral coil, and the inner ring are located on the same plane perpendicular to the rotation axis of the impeller.

43. The fan of claim 34, wherein: The fan also includes an air inlet side protective grille with several first fixing feet for fixing the grille. These first fixing feet are distributed around the periphery of the grille and extend toward the bell mouth. The first fixing feet and the bell mouth do not overlap in any direction perpendicular to the rotation axis of the impeller. The fan also includes a corresponding second screw and nut, and a housing. The nut is located inside the cylindrical body and between the air inlet side protective grille and the bell mouth. The second screw passes through the cylindrical wall and the first fixing feet from outside the cylindrical body and is screwed to the nut. The first fixing feet are clamped between the nut and the cylindrical wall. The housing covers one side of the motor, and the bell mouth surrounds the housing. The housing and the impeller are located on opposite sides of the air inlet side protective grille.

44. The fan of claim 34, wherein: The impeller is located inside the cylindrical body, which is a cylindrical shape with the rotation axis of the impeller as the central axis. The radial distance between the farthest point of each blade relative to the rotation axis of the impeller and the inner circumferential surface of the cylindrical body is no more than 10 mm.

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