CN118088472A - Delay fan and electric tool - Google Patents

Abstract

The invention relates to a delay fan and an electric tool, wherein the delay fan comprises: a rotation shaft for transmitting rotation power; the fan blade structure is rotatably and coaxially connected with the rotating shaft; an actuation assembly for actuating the fan blade structure; the actuating assembly comprises a mounting piece and an actuating piece, the mounting piece is coaxially connected with the rotating shaft, and the actuating piece is limited on the mounting piece; when the rotating shaft drives the mounting piece to rotate, the actuating piece is limited at the actuating position of the mounting piece, and at the moment, the mounting piece can drive the fan blade structure to rotate through the actuating piece; when the rotating shaft stops rotating, the mounting piece stops along with the stop, the actuating piece is separated from the actuating position, and at the moment, the fan blade structure continues rotating under inertia. According to the delay fan disclosed by the invention, after the rotating shaft stops rotating, the fan blade structure can delay stopping, so that the heat dissipation working time is prolonged.

Description

Delay fan and electric tool

Technical Field

The invention relates to the technical field of electric tools, in particular to a delay fan and an electric tool.

Background

The motor is used for driving the machinery to rotate, and when the motor works, high heat is generated due to high power, and a fan is required to be arranged for radiating the motor. The existing motor fan is started and stopped along with the motor, when the motor is powered off, the fan also stops rotating at the same time, and the temperature of the motor is still in a high-temperature state at the moment, the motor can only conduct and dissipate heat by virtue of air, the heat dissipation is slow, and the motor is in a high-temperature environment for a long time, so that the aging of parts is accelerated. In addition, if the motor with high power is overloaded frequently, the actual working condition temperature may approach or even exceed the safe temperature of the permanent magnet, and there is a demagnetization risk, so that the product fails.

Disclosure of Invention

Based on the above-mentioned drawbacks in the prior art, the present invention aims to provide a delay fan, in which after the rotation of the rotating shaft is stopped, the fan blade structure can be stopped in a delayed manner, so as to prolong the heat dissipation working time.

Therefore, the invention provides the following technical scheme.

The invention provides a delay fan, comprising:

a rotation shaft for transmitting rotation power;

The fan blade structure is rotatably and coaxially connected with the rotating shaft;

an actuation assembly for actuating the fan blade structure; the actuating assembly comprises a mounting piece and an actuating piece, the mounting piece is coaxially connected with the rotating shaft, and the actuating piece is limited on the mounting piece;

when the rotating shaft drives the mounting piece to rotate, the actuating piece is limited at the actuating position of the mounting piece, and at the moment, the mounting piece can drive the fan blade structure to rotate through the actuating piece;

When the rotating shaft stops rotating, the mounting piece stops along with the stop, the actuating piece is separated from the actuating position, and at the moment, the fan blade structure continues rotating under inertia.

Preferably, when the actuating member is limited at the actuating position, the actuating member abuts against the fan blade structure along the rotation direction of the rotating shaft.

Preferably, the actuating member is out of contact with the blade structure when the actuating member is out of the actuated position.

Preferably, the actuating assembly comprises an elastic member, one end of the elastic member is connected with the mounting member, and the other end of the elastic member is abutted against the actuating member;

When the rotating shaft is not rotated, the actuating piece is far away from the actuating position under the abutting pressure of the elastic piece; when the rotating shaft rotates, the actuating piece compresses the elastic piece under centrifugal force and moves to be limited at the actuating position.

Preferably, the actuating assembly comprises a magnetic attraction piece mounted on the mounting piece, and the actuating piece is a iron piece;

When the rotating shaft does not rotate, the actuating piece is away from the actuating position under the adsorption of the magnetic attraction piece; when the rotating shaft rotates, the actuating piece is separated from the adsorption of the magnetic attraction piece under the centrifugal force and moves to be limited at the actuating position.

Preferably, the mounting member is provided with a first groove, the fan blade structure is provided with a second groove, the first groove is matched with the second groove to form a containing cavity, and the actuating member is positioned in the containing cavity;

When the actuating member is limited at the actuating position, the actuating member is abutted against the side wall of the second groove.

Preferably, the actuating member is in a spherical structure, and a hemispherical concave cavity is formed in the side wall of the second groove; when the actuating member is limited in the actuating position, the actuating member is engaged with the hemispherical cavity.

Preferably, the second groove is a circular groove; the number of the hemispherical concave cavities is multiple, and the hemispherical concave cavities are distributed in a circumferential array.

Preferably, the first end of the first groove is hemispherical; when the actuating member is engaged with the first end, the actuating member is limited to the actuating position.

Preferably, the delay fan comprises a rolling bearing which is sleeved on the periphery of the rotating shaft; the fan blade structure is rotationally connected with the rotating shaft through the rolling bearing.

The invention also provides an electric tool which comprises a motor and the delay fan, wherein the motor is used for driving the rotating shaft to rotate.

The invention has the following technical effects:

The invention provides a delay fan, which transmits the rotation power of a rotating shaft to a fan blade structure through an actuating component so as to drive the fan blade structure to rotate for heat dissipation. According to the scheme, the actuating assembly is arranged to replace the scheme that the fan blade structure is directly driven to rotate through the rotating shaft in the prior art, when the rotating shaft stops rotating, the actuating piece of the actuating assembly can be separated from the actuating position to remove the interference of the actuating piece on the fan blade structure, and therefore the fan blade structure can continuously rotate for a period of time under the inertia of the fan blade structure, and the heat dissipation working time is prolonged.

Drawings

FIG. 1 is a schematic diagram of the assembly structure of a time delay fan and motor of the present invention;

FIG. 2 is a cross-sectional view of the assembly of the time delay fan and motor with the actuator in the free position in accordance with the first embodiment of the present invention;

FIG. 3 is a cross-sectional view of the assembly of the time delay fan and motor with the actuator in the actuated position in accordance with the first embodiment of the present invention;

Fig. 4 is an exploded view showing an assembly structure of a delay fan and a motor in a first embodiment of the present invention;

FIG. 5 is a front view of the actuator assembly when the actuator is in the free position in the first embodiment of the present invention;

FIG. 6 is a front view of the actuator assembly when the actuator is in the actuated position in the first embodiment of the present invention;

Fig. 7 is a front view of a mount in a first embodiment of the invention;

FIG. 8 is a schematic perspective view of a fan blade structure according to the present invention;

FIG. 9 is a sectional view showing the assembly structure of the time delay fan and the motor when the actuator is at the initial position in the second embodiment of the present invention;

FIG. 10 is a cross-sectional view of the assembly of the time delay fan and motor with the actuator in the actuated position in accordance with the second embodiment of the present invention;

FIG. 11 is an enlarged view of FIG. 9 at A;

fig. 12 is an exploded view showing an assembled structure of a delay fan and a motor in a second embodiment of the present invention;

FIG. 13 is a front view of the actuator assembly when the actuator is in the initial position in a second embodiment of the present invention;

FIG. 14 is a front view of the actuator assembly when the actuator is in the actuated position in a second embodiment of the present invention;

fig. 15 is a schematic perspective view of a magnetic attraction member of the present invention.

Description of the reference numerals

1. A delay fan;

11. A rotating shaft;

12. a fan blade structure; 121. a second groove; 1211. hemispherical cavity; 122. a fanning tray; 1221. a first clamping groove; 123. a fan blade;

13. An actuation assembly; 131. a mounting member; 1311. a first groove; 13111. a first end; 13112. a second end; 13113. a buckle; 13114. the clamping bulge; 132. an actuator; 133. an elastic member; 134. a magnetic attraction piece; 1341. a third clamping groove;

14. A rolling bearing;

2. a motor; 21. a rotor core; 211. a second clamping groove; 22. a magnet; 23. a first gimbal; 24. and a second balance ring.

Detailed Description

In order to make the technical scheme and the beneficial effects of the application more obvious and understandable, the following detailed description is given by way of example. Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the description of the present invention, unless explicitly defined otherwise, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience of simplifying the description of the present invention, and do not indicate that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, i.e., are not to be construed as limiting the present invention.

In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as relative importance of the features indicated or the number of technical features indicated. Thus, a feature defining "first", "second" may explicitly include at least one such feature. In the description of the present invention, "plurality" means at least two; "plurality" means at least one; unless otherwise specifically defined.

In the present invention, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly, unless otherwise specifically limited. For example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, or can be communicated between two elements or the interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless explicitly defined otherwise, a first feature "on", "above", "over" and "above", "below" or "under" a second feature may be that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact via an intermediary. Moreover, a first feature "above," "over" and "on" a second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the level of the first feature is higher than the level of the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the level of the first feature is less than the level of the second feature.

The power tool of the present invention will be described in detail with reference to fig. 1 to 15.

First embodiment

A power tool according to a first embodiment of the present invention will be described in detail with reference to fig. 1 to 8.

In the present embodiment, as shown in fig. 1 to 4, the electric tool includes a delay fan 1, a motor 2, a transmission member for transmitting power of the motor 2 to an output shaft (not shown in the drawings), and an output shaft for driving a drill to perform work. The delay fan 1 comprises a rotating shaft 11, a fan blade structure 12 and an actuating assembly 13, wherein the rotating shaft 11 is coaxially connected with the motor 2, and the fan blade structure 12 is rotatably and coaxially connected with the rotating shaft 11. The actuating assembly 13 comprises a mounting piece 131 and an actuating piece 132, wherein the mounting piece 131 is coaxially connected to the rotating shaft 11, and the actuating piece 132 is limited on the mounting piece 131.

When the motor 2 is operated, the rotating shaft 11 drives the mounting member 131 to rotate, and at this time, as shown in fig. 3 and 6, the actuating member 132 is limited at the actuating position of the mounting member 131, so that during the rotation of the mounting member 131, the actuating member 132 rotates around the axis of the rotating shaft 11 to apply a rotational driving force to the fan blade structure 12, and further cause the fan blade structure 12 to rotate along with the rotating shaft 11, and the fan blade structure 12 generates wind force through rotation to dissipate heat of the motor 2.

When the rotation of the shaft 11 is stopped, the mounting member 131 is stopped along with the rotation, and at this time, as shown in fig. 2 and 5, the actuating member 132 is moved and separated from the actuating position, so that the fan blade structure 12 can continue to rotate relative to the stationary shaft 11 under its own inertia.

Through adopting above-mentioned technical scheme, through actuating assembly 13 with the rotation power transmission of pivot 11 to flabellum structure 12 to drive flabellum structure 12 rotation and dispel the heat, and through setting up actuating assembly 13 and replacing the scheme of prior art through the direct drive flabellum structure 12 rotation of pivot 11, when pivot 11 stopped rotating, actuating assembly 13's actuating piece 132 can break away from actuating position, in order to release actuating piece 132 to the interference of flabellum structure 12, like this, flabellum structure 12 can continue to rotate for a period of time under self inertia, in order to lengthen the radiating duration.

In an embodiment, as shown in fig. 3, when the actuating member 132 is limited to the actuating position, the actuating member 132 abuts against the fan blade structure 12 along the rotation direction of the rotating shaft 11, so that when the rotating mounting member 131 drives the actuating member 132 to rotate around the axis of the rotating shaft 11, the actuating member 132 can apply a driving force to the fan blade structure 12 along the rotation direction of the rotating shaft 11, so as to cause the fan blade structure 12 to rotate.

In an embodiment, when the actuating member 132 is separated from the actuating position, the actuating member 132 is not in contact with the fan blade structure 12, so that when the rotation of the shaft 11 is stopped and the fan blade structure 12 continues to rotate under the inertia of itself, the actuating member 132 does not interfere with the rotation of the fan blade structure 12 at all, and the duration of the continued rotation of the fan blade structure 12 can be prolonged. Of course, when the actuating member 132 is out of the actuating position, the actuating member 132 and the fan blade structure 12 may also contact each other in the axial direction of the fan blade structure 12, but they may not contact each other in the circumferential direction, so that the actuating member 132 may generate less resistance to the continued rotation of the fan blade structure 12, but may not lock the fan blade structure 12.

In an embodiment, as shown in fig. 2 to 8, the mounting member 131 is provided with a first groove 1311, the fan blade structure 12 is provided with a second groove 121, the first groove 1311 and the second groove 121 cooperate to form a cavity, and the actuating member 132 is located in the cavity, so that the actuating member 132 is assembled conveniently. When the actuating member 132 is located at the actuating position, the actuating member 132 abuts against the side wall of the second groove 121, so that when the mounting member 131 rotates along with the rotating shaft 11, the actuating member 132 applies a circumferential pushing force to the side wall of the second groove 121, so as to cause the fan blade structure 12 to rotate.

Further, as shown in fig. 2, 3 and 8, the actuating member 132 has a spherical structure, and the sidewall of the second recess 121 is provided with a hemispherical cavity 1211. When the actuating member 132 is limited at the actuating position, the actuating member 132 is embedded in the hemispherical cavity 1211, so that when the actuating member 132 rotates around the axis of the rotating shaft 11, the actuating member 132 can be stably abutted against the inner wall of the hemispherical cavity 1211, and further can stably push the fan blade structure 12 to rotate.

Further, as shown in fig. 8, the second groove 121 is a circular groove; the number of hemispherical cavities 1211 is a plurality, and all of the hemispherical cavities 1211 are distributed in a circumferential array. Specifically, when the actuating member 132 moves to the position limited to the actuating position, if the positions of the actuating member 132 and the hemispherical cavity 1211 are not matched, the two cannot be engaged in time, at this time, the rotation power of the rotating shaft 11 cannot be immediately transmitted to the fan blade structure 12 through the actuating assembly 13, and when the mounting member 131 needs to be rotated until the actuating member 132 engages with the hemispherical cavity 1211, the rotation power of the rotating shaft 11 can be transmitted to the fan blade structure 12 through the actuating assembly 13, so as to smoothly actuate the fan blade structure 12, thereby resulting in delayed start of the fan blade structure 12. The present solution can increase the efficiency of the mating engagement of the actuating member 132, which is limited to the actuated position, with the hemispherical cavity 1211 by increasing the number of hemispherical cavities 1211.

Further, by defining a gap between adjacent two hemispherical cavities 1211 such that the actuator 132 moves to a point where it is limited to the actuated position, the actuator 132 immediately engages one hemispherical cavity 1211, thus enabling rapid actuation of the fan blade structure 12. Preferably, as shown in FIG. 8, all hemispherical recesses 1211 are connected in sequence to ensure that the fan blade structure 12 is capable of instantaneous activation.

Further, as shown in fig. 5 and 6, the width of the first groove 1311 is slightly smaller than the diameter of the actuating member 132, and the actuating member 132 is caught in the first groove 1311 by slight deformation of the first groove 1311 when assembled.

In an embodiment, in order to improve the stability of the actuating assembly 13 on the actuation of the fan blade structure 12, as shown in fig. 5 and 6, the number of the first grooves 1311 is four, and the four first grooves 1311 are arranged in a circumferential array, and the actuating members 132 are arranged in a one-to-one matching manner with the first grooves 1311. Of course, the number of the first grooves 1311 is not limited to four, but may be one, two, or even more.

In one embodiment, as shown in fig. 2 to 6, the actuating assembly 13 includes an elastic member 133, one end of which is connected to the first end 13111 of the first groove 1311 of the mounting member 131, and the other end of which abuts against the actuating member 132. When the rotating shaft 11 is not rotated, the actuating member 132 is pressed by the elastic member 133 to move away from the actuating position, and at this time, the actuating member 132 is in the free position. When the rotating shaft 11 rotates, the mounting member 131 drives the actuating member 132 to rotate around the axis of the rotating shaft 11 to generate centrifugal force, and when the centrifugal force is greater than the elastic force of the elastic member 133, the actuating member 132 overcomes the pressing of the elastic member 133 under the centrifugal force and moves to the actuating position, and at this time, the elastic member 133 is in a compressed state. When the rotation of the shaft 11 is stopped, the rotation of the mounting member 131 is stopped simultaneously, the centrifugal force is eliminated, and the actuator 132 is moved away from the actuation position by the rebound force of the elastic member 133, and returns to the free position. In this embodiment, the elastic member 133 is provided to ensure that the actuating member 132 does not move to the actuating position when the rotating shaft 11 is in the stationary state, so as to avoid the actuating member 132 interfering with the fan blade structure 12 to perform delayed rotation.

It should be understood that the "free position" in the foregoing indicates any position in the first groove 1311 other than the actuated position, and the actuating member 132 may just abut against the elastic member 133 in the uncompressed state, may abut against the second end 13112 of the first groove 1311 away from the actuated position, or may be any position between the elastic member 133 and the second end 13112.

Further, as shown in fig. 2, the elastic member 133 is a spring, and has a simple structure and is convenient to assemble.

Further, the connection manner of the elastic member 133 and the mounting member 131 includes, but is not limited to, bonding, fastening, clamping or welding. In an embodiment, as shown in fig. 7, the first groove 1311 is provided with a buckle 13113, and one end of the elastic member 133 is clamped to the buckle 13113, so as to implement assembly of the elastic member 133.

In one embodiment, as shown in fig. 2, the actuating member 132 is a ball, and has a simple structure and high strength.

In one embodiment, as shown in fig. 2 to 4, the time delay fan 1 includes a rolling bearing 14 which is sleeved on the outer circumference of the rotating shaft 11; the blade structure 12 is rotatably connected to the shaft 11 by means of a rolling bearing 14.

In an embodiment, as shown in fig. 4 and 8, the fan blade structure 12 includes a fan disc 122 and a plurality of fan blades 123, the second groove 121 is disposed on a side of the fan disc 122 facing the mounting member 131, the fan blades 123 are disposed on a side of the fan disc 122 facing the motor 2, and all the fan blades 123 are distributed in a circumferential array.

Further, as shown in fig. 2 and 4, the fanning tray 122 is provided with a first catching groove 1221, and the outer peripheral wall of the rolling bearing 14 is interference-connected to the first catching groove 1221.

In one embodiment, as shown in fig. 1 to 4, the motor 2 includes a rotor core 21, a magnet 22, a first balance ring 23, a second balance ring 24, and a rotor shaft, the rotor core 21 is provided with a second clamping groove 211, and the magnet 22 is accommodated in the second clamping groove 211. The rotor shaft forms a rotating shaft 11, one end of the rotating shaft 11 sequentially passes through a first balance ring 23, a rotor core 21 and a second balance ring 24 and then is connected with the delay fan 1, the other end of the rotating shaft 11 is used for driving an output shaft of the electric tool to work, and two ends of the rotor core 21 are respectively pressed by the first balance ring 23 and the second balance ring 24.

Second embodiment

A power tool illustrating a second embodiment of the present invention will be described with reference to fig. 9 to 15.

The electric power tool of the present embodiment is substantially the same as the electric power tool of the first embodiment, and mainly the differences between the two embodiments will be described below.

In this embodiment, as shown in fig. 9 to 15, the actuating assembly 13 further includes a magnetic attraction member 134 mounted to the mounting member 131, and the actuating member 132 is a ferrous member. When the rotation shaft 11 is not rotated, the actuating member 132 is away from the actuating position by the attraction of the magnetic attraction member 134, and at this time, the actuating member 132 is at the initial position as shown in fig. 9, 11 and 13. When the rotating shaft 11 rotates, the mounting member 131 drives the actuating member 132 to rotate around the axis of the rotating shaft 11 to generate centrifugal force, and when the centrifugal force is greater than the adsorption force of the magnetic attraction member 134, as shown in fig. 10 and 14, the actuating member 132 is separated from the adsorption of the magnetic attraction member 134 under the centrifugal force and moves to the actuating position. When the rotation of the rotation shaft 11 is stopped, the rotation of the mounting member 131 is stopped simultaneously, the centrifugal force is eliminated, and the actuator is returned to the initial position by the attraction force of the magnetic attraction member 134. In this solution, by providing the magnetic attraction element 134, the actuation element 132 is ensured to be able to be stably located at the initial position when the rotating shaft 11 is in the static state, so as to avoid the actuation element 132 from interfering with the fan blade structure 12 to generate delayed rotation.

Further, as shown in fig. 13 and 14, the first groove 1311 provided in the mounting member 131 includes a first end 13111 and a second end 13112, the first end 13111 has a hemispherical shape, and the magnetic attraction member 134 is connected to the second end 13112. As shown in fig. 14, when the actuating member 132 is located at the actuating position, the actuating member 132 is engaged with the first end 13111, and the hemispherical shape of the first end 13111 can improve the stability of the engagement between the actuating member 132 and the first end 13111.

In one embodiment, the attachment of the magnetic attraction element 134 to the mounting element 131 includes, but is not limited to, adhesive bonding, insert molding, or snap-fit. In a specific embodiment, as shown in fig. 10 and 15, the bottom wall of the first groove 1311 is provided with a clamping protrusion 13114, and the magnetic attraction piece 134 is provided with a third clamping groove 1341, and the clamping protrusion 13114 is clamped with the third clamping groove 1341, so as to realize assembly of the magnetic attraction piece 134. Further, in order to improve the stability of the engagement of both, the engagement protrusion 13114 is gradually enlarged outwardly from the bottom wall of the first groove 1311.

It should be understood that the delay fan 1 of the present invention may be provided without the elastic member 133 or the magnetic member 134, so that when the delay fan 1 is in the delay rotation state, the actuating member 132 is in a disordered state in the first groove 1311 of the mounting member 131, and the actuating member 132 may contact the hemispherical cavity 1211 of the second groove 121 during the disordered movement and then be bumped by the fan blade structure 12, so that the actuating member 132 may cause a certain resistance to the delay rotation of the fan blade structure 12, but the delay rotation of the fan blade structure 12 may still occur.

It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the invention which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present invention and do not limit the scope of protection of the patent of the present invention.

Claims (11)

1. A delay fan, the delay fan comprising:

a rotation shaft for transmitting rotation power;

The fan blade structure is rotatably and coaxially connected with the rotating shaft;

an actuation assembly for actuating the fan blade structure; the actuating assembly comprises a mounting piece and an actuating piece, the mounting piece is coaxially connected with the rotating shaft, and the actuating piece is limited on the mounting piece;

when the rotating shaft drives the mounting piece to rotate, the actuating piece is limited at the actuating position of the mounting piece, and at the moment, the mounting piece can drive the fan blade structure to rotate through the actuating piece;

When the rotating shaft stops rotating, the mounting piece stops along with the stop, the actuating piece is separated from the actuating position, and at the moment, the fan blade structure continues rotating under inertia.

2. The time delay fan of claim wherein the actuator abuts the blade structure in a direction of rotation of the shaft when the actuator is limited to the actuated position.

3. The time delay fan of claim, wherein the actuator is out of contact with the blade structure when the actuator is out of the actuated position.

4. The time delay fan of claim wherein said actuation assembly comprises an elastic member having one end connected to said mounting member and the other end abutting said actuation member;

When the rotating shaft is not rotated, the actuating piece is far away from the actuating position under the abutting pressure of the elastic piece; when the rotating shaft rotates, the actuating piece compresses the elastic piece under centrifugal force and moves to be limited at the actuating position.

5. The time delay fan of claim wherein said actuation assembly comprises a magnetic attraction member mounted to said mounting member, said actuation member being a ferrous member;

When the rotating shaft does not rotate, the actuating piece is away from the actuating position under the adsorption of the magnetic attraction piece; when the rotating shaft rotates, the actuating piece is separated from the adsorption of the magnetic attraction piece under the centrifugal force and moves to be limited at the actuating position.

6. The time delay fan of any one of claims wherein the mounting member is provided with a first recess and the blade structure is provided with a second recess, the first recess and the second recess cooperating to form a cavity, the actuating member being located within the cavity;

When the actuating member is limited at the actuating position, the actuating member is abutted against the side wall of the second groove.

7. The time delay fan of claim wherein said actuator is of spherical configuration and the side wall of said second recess is provided with a hemispherical cavity; when the actuating member is limited in the actuating position, the actuating member is engaged with the hemispherical cavity.

8. The time delay fan of claim wherein said second recess is a circular recess; the number of the hemispherical concave cavities is multiple, and the hemispherical concave cavities are distributed in a circumferential array.

9. The time delay fan of claim wherein the first end of the first recess is hemispherical in shape; when the actuating member is engaged with the first end, the actuating member is limited to the actuating position.

10. The delay fan of any one of claims, wherein the delay fan comprises a rolling bearing that is sleeved on the periphery of the rotating shaft; the fan blade structure is rotationally connected with the rotating shaft through the rolling bearing.

11. A power tool comprising a motor and a time delay fan as claimed in any one of claims, the motor being arranged to drive the shaft in rotation.