Accidental injury prevention portable fan

Abstract

The utility model belongs to the technical field of fans, and discloses an accidental injury prevention portable fan which comprises a supporting shaft, a rotating assembly, a coil and a control piece. The coil is arranged in an installation cavity defined by the rotor and arranged on the supporting shaft in a sleeving mode, the rotor can rotate around the axis direction of the rotor under the action of magnetic field force generated after the coil is powered on, and the fan blades are in an unfolded state perpendicular to the axis direction of the rotor under the action of centrifugal force. When an object or a finger accidentally touches the fan blades in the rotating process, the rotating speed of the fan blades is reduced, the rotating speed of the rotor is reduced, and the slip ratio (the difference between the synchronous rotating speed and the actual rotating speed) is increased, so that the induction current of the rotor and the current in the coil are increased; when the fan rotates, conductive connection between the coil and an external power source is cut off, the rotor and the fan blades are forced to stop rotating, and after the rotor stops rotating, the fan blades lose the centrifugal force effect and can be automatically switched to an avoiding state parallel to the axis direction of the rotor to prevent objects or fingers from being scratched.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field especially relates to a portable fan of preventing accidental injury. BACKGROUND

[0002] Fan is a kind of electric appliance using motor to drive fan blade rotation, drives air to accelerate circulation, mainly used for cooling and air circulation, widely used in daily life.

[0003] At present, the main axial fan on the market, whether working or not, fan blade is unfolded state, in the use process, high-speed rotating fan blade can easily cause irreversible injury to the object or finger touching fan blade. In order to avoid injury to people, a part of fan will add a protective cover around it, but the cost is higher, and the space is larger, is not convenient to store and carry;There is also a part of fan blade can be disassembled, when fan does not work, fan blade is disassembled, when using, fan blade is installed again, there is the problem of complicated operation, low use efficiency and poor use experience. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a portable fan of preventing accidental injury, which will not cause injury to the object or finger accidentally touching the fan blade, is convenient to store and carry, can be used at will, is suitable for various outdoor and indoor scenes, and has good economy.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] A portable fan of preventing accidental injury is provided, comprising:

[0007] Supporting shaft;

[0008] Rotating assembly, comprising rotor and a plurality of fan blades, the rotor is sleeved on the supporting shaft, and the rotor is surrounded by the installation chamber, a plurality of fan blades are arranged on the rotor along the circumferential direction of the rotor, and the fan blade has unfolded state perpendicular to the rotor axis direction and avoidance state parallel to the rotor axis direction;

[0009] Coil, arranged in the installation chamber and sleeved on the supporting shaft, the coil is conductively connected with external power supply;The coil can generate magnetic field after being electrified, and the rotating assembly can rotate around the rotor axis direction under the action of the magnetic field force;

[0010] Control element, arranged in the installation chamber and connected with the coil, can monitor the current value in the coil;The control element can control the on-off of the coil and the external power supply.

[0011] As an optional scheme of the portable fan of preventing accidental injury, the rotor comprises:

[0012] a housing rotatably sleeved on the support shaft;

[0013] a cover rotatably sleeved on the support shaft and detachably arranged on the housing, the housing and the cover surrounding the mounting chamber;

[0014] a mounting plate rotatably sleeved on the support shaft and clamped on a side of the cover facing the housing, the mounting plate being circumferentially provided with a plurality of limiting grooves, each of the plurality of fan blades being provided with a limiting portion, and the limiting portions of the plurality of fan blades being one-to-one correspondingly arranged in the limiting grooves and abutting against the inner wall of the cover;

[0015] the coil is located between the mounting plate and the housing, and the control member abuts against one end of the coil close to the mounting plate.

[0016] As an optional solution of the portable anti-injury fan, the outer circumferential wall of the mounting plate is circumferentially and spacedly provided with a plurality of clamping portions, the cover is circumferentially and spacedly provided with a plurality of clamping grooves, and the plurality of clamping portions are one-to-one correspondingly clamped in the plurality of clamping grooves.

[0017] As an optional solution of the portable anti-injury fan, the support shaft is sleeved with a first elastic member, and the first elastic member abuts between the mounting plate and the control member.

[0018] As an optional solution of the portable anti-injury fan, the bottom wall of the housing is circumferentially provided with a plurality of heat dissipation holes.

[0019] As an optional solution of the portable anti-injury fan, the rotor further comprises a plurality of fasteners; the cover is circumferentially and spacedly provided with a plurality of first connecting holes, the housing is circumferentially and spacedly provided with a plurality of second connecting holes, the first connecting holes and the second connecting holes are one-to-one corresponding, and the fasteners pass through the corresponding first connecting holes and extend into the corresponding second connecting holes.

[0020] As an optional solution of the portable anti-injury fan, a side of the cover away from the housing is circumferentially and spacedly provided with a plurality of grooves, and the plurality of first connecting holes are one-to-one correspondingly arranged at the groove bottoms of the plurality of grooves.

[0021] As an optional solution of the portable anti-injury fan, the portable anti-injury fan further comprises a clamping assembly for clamping on a fixed base, and the support shaft is rotatably arranged on the clamping assembly.

[0022] As an optional solution of the portable anti-injury fan, a side of the clamping assembly facing the fixed base is provided with an anti-slip structure.

[0023] As an optional solution of the portable fan for preventing accidental injury, the support shaft is provided with a channel extending along the axial direction of the support shaft, and the channel is used for allowing the wire connected between the coil and the external power supply to pass through.

[0024] The portable fan for preventing accidental injury has the following beneficial effects:

[0025] The utility model provides a kind of portable fan for preventing accidental injury, coil is set in the installation chamber of rotor and is set on support shaft, rotor can rotate around its axial direction under the magnetic field force of coil energization, make fan blade in the unfolding state perpendicular to rotor axial direction under the centrifugal force, to reach the effect of accelerating air circulation, heat relieving.When object or finger accidentally touches fan blade in rotation process, fan blade rotation speed reduces, rotor rotation speed drops, and the difference between synchronous speed and actual speed increases, and then the induced current of rotor and the current in coil rise, control piece monitors that the current value in coil increases to set value, will break the electrically conductive connection of coil and external power supply, force rotor and fan blade to stop rotating, after rotor stops rotating, fan blade loses centrifugal force effect, can automatically switch to the avoidance state parallel to rotor axial direction, to prevent scratching object or finger.Simultaneously, it can also effectively avoid coil overheat damage, prolong the service life of fan.In addition, when fan is in power-off state, multiple fan blades are in avoidance state parallel to rotor axial direction, can effectively reduce the occupied space of fan, facilitate storage and carrying, take and use, applicable to a variety of outdoor and indoor scene. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is the structure diagram of portable fan for preventing accidental injury provided by the embodiment of the specific embodiment of the utility model;

[0027] Fig. 2 It is the sectional view of rotor provided by the embodiment of the specific embodiment of the utility model;

[0028] Fig. 3 It is the explosion drawing of portable fan for preventing accidental injury provided by the embodiment of the specific embodiment of the utility model.

[0029] In the drawing:

[0030] 1, support shaft; 11, first elastic member; 12, second elastic member;

[0031] 2, rotating assembly;

[0032] 21, rotor; 210, installation chamber;

[0033] 211, shell; 2110, heat dissipation hole; 2111, second connecting hole; 2112, first rotating bearing; 2113, magnetic conducting member;

[0034] 212, Cover; 2120, Snap-fit ​​groove; 2121, First connecting hole;

[0035] 213. Mounting plate; 2130. Limiting groove; 2131. Snap-fit ​​part; 2132. Second rotary bearing;

[0036] 22. Fan blade; 221. Limiting part;

[0037] 3. Coil;

[0038] 4. Control components;

[0039] 5. Clamping assembly; 50. Arc groove; 51. Ball head shaft; 52. Protective tube. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] like Figs. 1 to 3 As shown, this embodiment provides a portable fan designed to prevent accidental injury, including a support shaft 1, a rotating assembly 2, a coil 3, and a control component 4. The rotating assembly 2 includes a rotor 21 and multiple fan blades 22. The rotor 21 is sleeved on the support shaft 1, and a mounting chamber 210 surrounds the rotor 21. The multiple fan blades 22 are spaced apart circumferentially on the rotor 21, and each fan blade has an extended state perpendicular to the rotor 21's axis and a non-existent state parallel to the rotor 21's axis. The coil 3 is disposed within the mounting chamber 210 and sleeved on the support shaft 1. The coil 3 is electrically connected to an external power source. When energized, the coil 3 generates a magnetic field. Under the influence of the magnetic field, the rotating assembly 2 can rotate around the rotor 21's axis. The fan blades 22, under centrifugal force, can switch to an extended state perpendicular to the rotor 21's axis to accelerate airflow and cool the air. The control element 4 is located in the mounting chamber 210 and connected to the coil 3. The control element 4 can monitor the current value in the coil 3 and control the connection and disconnection between the coil 3 and the external power supply.

[0046] When an object or finger accidentally touches the rotating fan blade 22, the fan blade 22's rotational speed decreases, the rotor 21's rotational speed decreases, and the slip (the difference between the synchronous speed and the actual speed) increases. This leads to an increase in the induced current in the rotor 21 and the current in the coil 3. Once the control unit 4 detects that the current value in the coil 3 has increased to a set value, it will disconnect the conductive connection between the coil 3 and the external power supply, forcing the rotor 21 and fan blade 22 to stop rotating. After the rotor 21 stops rotating, the fan blade 22 loses its centrifugal force and can automatically switch to a avoidance state parallel to the rotor 21's axis to prevent scratching objects or fingers. At the same time, it can also effectively prevent the coil 3 from overheating and being damaged, extending the fan's service life.

[0047] In addition, when the fan is powered off, all the fan blades 22 are in a parallel and non-apart state with the axis of the rotor 21, which can effectively reduce the space occupied by the fan, making it easy to store and carry, and ready to use at any time. It is suitable for use in a variety of outdoor and indoor scenarios.

[0048] Specifically, the control member 4 is a controller commonly used in the art, and the controller is provided with a circuit board on which relevant monitoring programs and control programs are burned. The structure and working principle of the circuit board and the relevant control programs refer to the prior art, and will not be described here.

[0049] Exemplarily, in the embodiment, the fan blades 22 are provided in three; in other embodiments, the specific number of the fan blades 22 can be set as required, which is not specifically limited here.

[0050] Optionally, the support shaft 1 is provided with a channel extending along the axis direction thereof, the channel being used for allowing a wire connected between the coil 3 and an external power supply to pass through, which can effectively prevent the wire from being squeezed, scratched and worn, and on the other hand, the structure is lightweight and more neat and beautiful.

[0051] Optionally, the rotor 21 comprises a housing 211, a cover 212 and a mounting plate 213, the housing 211 is rotatably sleeved on the support shaft 1, the cover 212 is rotatably sleeved on the support shaft 1 and detachably arranged on the housing 211, the housing 211 and the cover 212 surround a mounting cavity 210, the mounting plate 213 is rotatably sleeved on the support shaft 1 and clamped on one side of the cover 212 facing the housing 211, the mounting plate 213 is provided with a plurality of limiting grooves 2130 along the circumference, each fan blade 22 is provided with a limiting portion 221, and the limiting portions 221 of the plurality of fan blades 22 are rotatably arranged in the plurality of limiting grooves 2130 one by one and abut against the inner wall of the cover 212. The coil 3 is located between the mounting plate 213 and the housing 211, and the control member 4 abuts against one side of the coil 3 close to the mounting plate 213. The above arrangement can ensure the stability of the fan blades 22 mounted on the rotor 21, and can ensure the smooth switching of the fan blades 22 between the unfolded state and the avoiding state.

[0052] Specifically, the housing 211 is provided with a first rotating bearing 2112, which rotatably abuts against the end of the support shaft 1 to ensure the smoothness of the rotation of the housing 211 under the magnetic field force; in the embodiment, the housing 211 is provided with a first fixing groove on the bottom wall, and the first rotating bearing 2112 is arranged in the fixing groove to ensure the rotation stability of the first rotating bearing 2112. The mounting plate 213 is provided with a second rotating bearing 2132, which is rotatably sleeved on the support shaft 1 to ensure the smoothness of the rotation of the mounting plate 213; specifically, the mounting plate 213 is provided with a second fixing groove, and the second rotating bearing 2132 is arranged in the second fixing groove to ensure the rotation stability of the second rotating bearing 2132. The first rotating bearing 2112 and the second rotating bearing 2132 are both existing devices, and their specific structures and principles refer to the prior art, which will not be described here.

[0053] Further, the outer peripheral wall of the mounting plate 213 is provided with a plurality of clamping portions 2131 spaced apart in the circumferential direction, and the cover 212 is provided with a plurality of clamping grooves 2120 spaced apart in the circumferential direction. The plurality of clamping portions 2131 are correspondingly clamped in the plurality of clamping grooves 2120 to limit the mounting plate 213 in the circumferential direction, so as to ensure that the mounting plate 213 rotates synchronously with the cover 212. Specifically, in the embodiment, the plurality of clamping grooves 2120 and the plurality of limiting grooves 2130 are correspondingly communicated with each other. For example, the clamping portions 2131 and the clamping grooves 2120 are each provided with three.

[0054] Optionally, the support shaft 1 is sleeved with a first elastic member 11 abutting between the mounting plate 213 and the control member 4, so as to buffer the vibration between the mounting plate 213 and the control member 4, avoid damage of the control member 4 under external force vibration, and prolong the service life of the control member 4. For example, the first elastic member 11 is a spring commonly used in the art, which has good elastic performance and simple structure and low cost.

[0055] Specifically, the support shaft 1 is further sleeved with a second elastic member 12 penetrating through the first rotating bearing 2112 and abutting at one end on the coil 3 and at the other end on the end of the support shaft 1, so as to buffer and damp the coil 3. For example, the second elastic member 12 is also a spring.

[0056] Optionally, the bottom wall of the shell 211 is provided with a plurality of heat dissipation holes 2110 spaced apart in the circumferential direction. The heat dissipation holes 2110 are used to communicate the installation cavity 210 with the external environment, so as to ensure that the heat generated by the coil 3 after being electrified can be discharged from the installation cavity 210 in time, prevent the heat from accumulating inside the rotor 21, and ensure the service life of the rotor 21.

[0057] For example, in the embodiment, the heat dissipation holes 2110 are provided with six; in other embodiments, the number of heat dissipation holes 2110 can be set as required, which is not limited here.

[0058] Optionally, the rotor 21 further comprises a plurality of fasteners (not shown in the figure). The cover 212 is provided with a plurality of first connecting holes 2121 spaced apart in the circumferential direction, and the shell 211 is provided with a plurality of second connecting holes 2111 spaced apart in the circumferential direction. The first connecting holes 2121 and the second connecting holes 2111 are correspondingly arranged, and the fasteners pass through the corresponding first connecting holes 2121 and extend into the corresponding second connecting holes 2111, so as to realize detachable connection of the cover 212 and the shell 211, which is simple and convenient to operate and can improve the assembly efficiency. Specifically, the first connecting holes 2121 are through holes, the second connecting holes 2111 are threaded holes, and the fasteners are bolts. For example, the first connecting holes 2121, the second connecting holes 2111 and the fasteners are each provided with three.

[0059] Further, the cover 212 is provided with a plurality of grooves at intervals in the circumferential direction away from the side of the shell 211, and a plurality of first connecting holes 2121 are provided at the bottom of the grooves in one-to-one correspondence. The end of the fastener is completely embedded in the cover 212, ensuring that the surface of the cover 212 is smooth and more beautiful and tidy, and at the same time, effectively avoiding the end of the fastener from colliding and rubbing with other components or objects. For example, the grooves are also provided with three.

[0060] Optionally, the inner wall of the shell 211 is provided with a plurality of connecting portions at intervals in the circumferential direction, and a plurality of second connecting holes 2111 are provided on the connecting portions in one-to-one correspondence. The shell 211 is provided with a magnetic guide 2113, which is sleeved on the outer side of the coil 3 and abuts on the connecting portions. Under the action of the magnetic field force of the magnetic field generated by the coil 3, the magnetic guide 2113 can drive the rotor 21 to rotate synchronously. The above-mentioned arrangement makes the internal structure of the rotor 21 compact, and optimizes the space utilization. For example, the connecting portions are also provided with three; the magnetic guide 2113 is a silicon steel sheet, or the magnetic guide 2113 can also be made of other magnetic materials.

[0061] Optionally, the anti-injury portable fan further comprises a clamping assembly 5 for clamping on a fixed base, so that the fan can be flexibly applied to various positions, and at the same time, the stability of the fan during use can be ensured. The support shaft 1 is rotatably arranged on the clamping assembly 5, which facilitates flexible adjustment of the blowing direction of the fan to meet individualized use requirements.

[0062] The above-mentioned fixed base can be a desktop, an umbrella handle or the like, so that the fan can be flexibly applied to various positions.

[0063] Specifically, a rotating groove is arranged on the clamping assembly 5, and a ball head shaft 51 is arranged on the end of the support shaft 1 away from the rotor 21, and the ball head end of the ball head shaft 51 is rotatably arranged in the rotating groove. For example, the clamping assembly 5 is a commonly used fixing clamp in the prior art; the ball head shaft 51 is also an existing device disclosed in the prior art, and its specific structure and principle are referred to the prior art, which will not be described here.

[0064] More specifically, the ball head shaft 51 is also a hollow structure, and the inside of the ball head shaft 51 is communicated with the channel of the support shaft 1, and the wire passes through the ball head shaft 51 and the support shaft 1 and extends into the installation cavity 210. For example, in this embodiment, a protective tube 52 is arranged on the clamping assembly 5, and the wire passes through the protective tube 52 and then passes through the ball head shaft 51 to the channel of the support shaft 1. The arrangement of the protective tube 52 avoids direct exposure of the wire to the external environment, reduces damage to the insulation layer of the wire caused by friction, vibration or accidental pulling, and reduces the aging speed of the wire.

[0065] Further, the side of the clamping assembly 5 facing the fixed base is provided with an anti-skid structure, specifically, the anti-skid structure is an anti-skid pad such as a rubber pad, etc. provided on the side of the clamping assembly 5 facing the fixed base; or the anti-skid structure is an anti-skid protrusion provided on the side of the clamping assembly 5 facing the fixed base, the anti-skid protrusion can be a point protrusion or a protrusion with any shape of lines, which functions to increase the frictional force between the clamping assembly 5 and the fixed base to prevent the clamping assembly 5 from moving. The specific form can refer to the prior art, and is not specifically limited in the embodiment, as long as it can increase the friction.

[0066] Exemplarily, in the embodiment, the side of the clamping assembly 5 clamping the fixed base is provided with an arc-shaped groove 50 to facilitate clamping the fixed base in a rod shape, for example, to facilitate clamping on a umbrella handle to improve the stability of clamping and fixing.

[0067] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A portable fan with an injury prevention feature, comprising: include: Support shaft (1); The rotating assembly (2) includes a rotor (21) and a plurality of fan blades (22). The rotor (21) is sleeved on the support shaft (1), and the rotor (21) surrounds an installation chamber (210). The plurality of fan blades (22) are arranged at intervals along the circumference of the rotor (21). The fan blades (22) have an unfolded state perpendicular to the axis of the rotor (21) and an avoidance state parallel to the axis of the rotor (21). A coil (3) is disposed in the mounting chamber (210) and sleeved on the support shaft (1). The coil (3) is electrically connected to an external power source. When the coil (3) is energized, it can generate a magnetic field. Under the action of the magnetic field force, the rotating component (2) can rotate around the axis of the rotor (21). The control unit (4) is disposed in the mounting chamber (210) and connected to the coil (3), and is capable of monitoring the current value in the coil (3); The control unit (4) can control the connection and disconnection between the coil (3) and the external power supply.

2. The inadvertent injury preventing portable fan of claim 1, wherein, The rotor (21) includes: The housing (211) is rotatably fitted onto the support shaft (1); The cover (212) is rotatably sleeved on the support shaft (1) and detachably mounted on the housing (211), the housing (211) and the cover (212) enclosing the mounting chamber (210); The mounting plate (213) is rotatably sleeved on the support shaft (1) and locked on the side of the cover (212) facing the housing (211). The mounting plate (213) has multiple limiting grooves (2130) circumferentially. Each fan blade (22) is provided with a limiting part (221). The limiting parts (221) of the multiple fan blades (22) are rotatably disposed in the multiple limiting grooves (2130) and abut against the inner wall of the cover (212). The coil (3) is located between the mounting plate (213) and the housing (211), and the control element (4) abuts against the end of the coil (3) near the mounting plate (213).

3. The inadvertent injury preventing portable fan of claim 2, wherein, The mounting plate (213) has a plurality of snap-fit ​​parts (2131) protruding at intervals along the circumferential direction on its outer peripheral wall, and the cover (212) has a plurality of snap-fit ​​grooves (2120) at intervals along the circumferential direction. The plurality of snap-fit ​​parts (2131) are snapped into the plurality of snap-fit ​​grooves (2120) in a corresponding manner.

4. The inadvertent injury preventing portable fan of claim 2, wherein, A first elastic element (11) is sleeved on the support shaft (1), and the first elastic element (11) abuts between the mounting plate (213) and the control element (4).

5. The inadvertent injury preventing portable fan of claim 2, wherein, The bottom wall of the housing (211) is provided with a plurality of heat dissipation holes (2110) along the circumferential direction.

6. The inadvertent injury preventing portable fan of claim 2, wherein, The rotor (21) further comprises a plurality of fasteners; the cover (212) is provided with a plurality of first connecting holes (2121) which are spaced apart circumferentially, the shell (211) is provided with a plurality of second connecting holes (2111) which are spaced apart circumferentially, the first connecting holes (2121) and the second connecting holes (2111) correspond one by one, and the fasteners pass through the corresponding first connecting holes (2121) and extend into the corresponding second connecting holes (2111).

7. The inadvertent injury preventing portable fan of claim 6, wherein, The cover (212) is provided with a plurality of grooves which are spaced apart circumferentially on the side away from the shell (211), and a plurality of the first connecting holes (2121) are correspondingly arranged at the groove bottoms of the grooves.

8. The inadvertent injury preventing portable fan of claim 1, wherein, The anti-misuse portable fan further comprises a clamping assembly (5) for clamping on a fixed base, and the support shaft (1) is rotatably arranged on the clamping assembly (5).

9. The inadvertent injury preventing portable fan of claim 8, wherein, The side of the clamping assembly (5) facing the fixed base is provided with an anti-skid structure.

10. The inadvertent injury preventing portable fan of any of claims 1-9, wherein, The support shaft (1) is provided with a channel extending along the axis direction thereof, and the channel is used for allowing a wire connected between the coil (3) and the external power supply to pass through.

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