CN220081755U - Axial fan and axial fan - Google Patents

Abstract

The utility model relates to the technical field of axial flow fans, and discloses an axial flow fan, which comprises: a hub; the first blades are arranged at intervals along the circumferential direction of the hub, a hollow accommodating cavity is formed in each first blade, and an opening is formed in the front edge side of each first blade; the blade switching mechanism comprises a second blade which is rotatably arranged in the accommodating cavity, and the second blade can be at least controlled to be shifted in a translation mode between a shifting-out state and a shifting-in state, wherein the shifting-out state comprises that the second blade is shifted out of the accommodating cavity through the opening, and the shifting-in state comprises that the second blade is shifted into the accommodating cavity through the opening. The utility model can change the air quantity without changing the rotating speed of the axial flow fan or obtain larger air quantity at higher rotating speed. The utility model also discloses an axial flow fan.

Description

Axial fan and axial fan

Technical Field

The present utility model relates to the technical field of axial fans, and for example, to an axial fan and an axial fan.

Background

Currently, an axial flow fan is a device in which blades push air to flow in the same direction as a shaft. The axial fans are divided into large axial fans, medium axial fans and small axial fans, and the proper axial fans are selected according to the application places of the requirements. In general, large axial fans are mainly used for exhausting air in such places as dust, gravel sites, etc.; the medium axial flow fan is mainly suitable for indoor ventilation and heat extraction; the small axial fan is mainly suitable for ventilation and heat dissipation of mechanical equipment.

The axial flow fan in the related art includes a hub and a plurality of blades; the blades are arranged on the hub, the blades are arranged at intervals along the circumferential direction of the hub, each blade is provided with a front edge part and a rear edge part which are distributed along the rotation direction of the blade, the middle part of the blade, which is close to the front edge, is recessed from the suction surface, and a notch which is opened towards the rotation direction of the blade is formed.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the blade structure of the axial flow fan cannot be adjusted, the size of the blade is fixed, and the rotating speed of the axial flow fan can be only used for controlling the size of the air quantity under the condition that the air quantity needs to be changed.

It should be noted that the information disclosed in the above background section is only for enhancing the understanding of the background of the utility model and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides an axial flow fan and an axial flow fan, so as to change the air quantity without changing the rotating speed of the axial flow fan or obtain larger air quantity at a higher rotating speed.

In some embodiments, the axial flow fan comprises: a hub; the first blades are arranged at intervals along the circumferential direction of the hub, a hollow accommodating cavity is formed in the first blades, and an opening is formed in the front edge side of each first blade; the blade switching mechanism comprises a second blade which is rotatably arranged in the accommodating cavity and can be at least controlled to be switched in a translational mode between an out-of-state and an in-of-state, wherein the out-of-state comprises the second blade moving out of the accommodating cavity through the opening, and the in-of-state comprises the second blade moving into the accommodating cavity through the opening.

In some embodiments, the second blade includes a rotational end and a movable end, the movable end being rotatable about the rotational end to controllably shift in translation between the out-of-position and the in-position; the blade switching mechanism further includes: the pivot shaft penetrates through the rotating end and is fixedly connected with the first blade; the driving assembly is in driving connection with the rotating end and is used for driving the rotating end to rotate around the pivot shaft along a first direction or a second direction so that the moving end can rotate around the rotating end, and at least the moving end is in translational switching between the moving-out state and the moving-in state, wherein the first direction and the second direction are opposite in rotation direction.

In some embodiments, the drive assembly comprises: the first driving gear is coaxially arranged with the hub; the first driven rack is fixedly arranged at the rotating end and is meshed with the first driving gear; and the output shaft of the driving motor is in driving connection with the first driving gear and is used for driving the first driving gear to rotate along the clockwise pointer or anticlockwise direction so as to drive the first driven rack to reciprocate along the length direction of the first driven rack, so that the rotating end rotates around the pivot shaft.

In some embodiments, the first driven rack includes a first end and a second end, the first end and the second end are both provided with a limiting piece, and after the first driven rack moves a set distance along a length direction of the first driven rack towards a direction of the first end/the second end, the first driving gear abuts against the limiting piece to form a stop fit.

In some embodiments, the hub comprises a first sidewall; the drive assembly includes: the second driving gear is arranged inside the hub and is coaxially arranged with the hub; the second driven rack is fixedly arranged at the rotating end and is meshed with the second driving gear; the guide sliding rail is formed on the first side wall in an extending manner along the rotation direction of the second driving gear; the driving rod is fixedly connected with the second driving gear and is in sliding fit with the guide sliding rail.

In some embodiments, the guide rail is an arcuate rail that curves away from the hub axle.

In some embodiments, the axial flow fan further comprises a first magnetic attraction piece and a second magnetic attraction piece which are attracted to each other, the first magnetic attraction piece is respectively arranged at two ends of the guide sliding rail, and the second magnetic attraction piece is arranged on the peripheral wall surface of the driving rod.

In some embodiments, the first blade includes a trailing edge side disposed opposite the leading edge side, the trailing edge side being formed with a notch extending from the trailing edge side toward the leading edge side.

In some embodiments, the notch comprises a V-notch.

In some embodiments, the axial flow fan comprises an axial flow fan as previously described.

The axial flow fan and the axial flow fan provided by the embodiment of the disclosure can realize the following technical effects:

the second blade is arranged in the hollow accommodating cavity in the first blade, and can be moved into or out of the accommodating cavity by controlling the rotation of the second blade. When the second blade is in the moving-in state, namely, the second blade moves into the accommodating cavity through the opening, the axial flow fan can provide smaller air quantity; when the second blade is in the moving-out state, namely, when the second blade moves out of the accommodating cavity through the opening, the second blade can be combined with the first blade, so that the blade area of the axial flow fan for acting can be effectively increased when the axial flow fan operates, the air supply air quantity of the axial flow fan is increased, the air supply air quantity can be increased under the condition that the rotating speed of the axial flow fan is not changed, or the larger air supply air quantity can be obtained under the condition that the rotating speed of the axial flow fan is higher.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the utility model.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic view of a second blade of an axial fan according to an embodiment of the present disclosure in an in-position configuration;

FIG. 2 is a schematic view of a second blade of an axial fan according to an embodiment of the present disclosure in a removed state;

FIG. 3 is a schematic cross-sectional view of an axial flow fan provided by an embodiment of the present disclosure with a first blade removed;

FIG. 4 is a schematic view of a second blade of an axial fan according to an embodiment of the present disclosure in an in-position configuration;

FIG. 5 is a schematic view of a second blade of an axial fan according to an embodiment of the present disclosure in a removed state;

FIG. 6 is an enlarged partial schematic view of FIG. 5;

fig. 7 is a schematic cross-sectional view of another axial flow fan provided by an embodiment of the present disclosure, with a first blade removed.

Reference numerals:

100. a hub; 110. a first sidewall;

200. a first blade; 230. a notch;

300. a blade switching mechanism; 310. a second blade; 311. a rotating end; 312. a moving end; 320. a pivot shaft; 330. a drive assembly; 331. a first drive gear; 332. a first driven rack; 333. a second drive gear; 334. a second driven rack; 335. a guide rail; 336. and a driving rod.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

As shown in conjunction with fig. 1 and 2, an embodiment of the present disclosure provides an axial flow fan including a hub 100, a first blade 200, and a blade switching mechanism 300.

The plurality of first blades 200 are spaced apart along the circumferential direction of the hub 100. The first blade 200 has a hollow accommodating chamber inside, and the front edge side of the first blade 200 is provided with an opening. The blade switching mechanism 300 includes a second blade 310 rotatably disposed in the accommodating chamber. The second vane 310 is at least controllably translatable between an extended state and an extended state. Wherein the removed state includes the second blade 310 moving out of the receiving cavity through the opening, and the moved-in state includes the second blade 310 moving into the receiving cavity through the opening.

Alternatively, the plurality of first blades 200 are arranged at intervals along the circumferential direction of the hub 100. In the case that the hub 100 rotates, the first blades 200 are driven to rotate, and the first blades 200 can cause disturbance to surrounding air flow, so that wind pressure is formed between adjacent first blades 200, and the axial flow fan generates wind blown out to the outside.

Alternatively, the first blade 200 has a hollow accommodating chamber inside, and an opening is provided at the front edge side of the first blade 200. The vane switching mechanism 300 includes a second vane 310 disposed within the receiving cavity, the second vane 310 being at least controllably translatable between an out-of-position and an in-position. Optionally, the removed state includes the second blade 310 being removed from the receiving cavity through the opening. In this way, the second blade 310 may be combined with the first blade 200, so that the blade area of the axial flow fan for doing work can be effectively increased, and the air supply volume of the axial flow fan can be increased, so that the air supply volume can be increased without changing the rotation speed of the axial flow fan, or a larger air supply volume can be obtained at a higher rotation speed. Alternatively, the moved-in state includes the second blade 310 being moved into the accommodating chamber through the opening. In this way, the axial flow fan can provide a smaller air volume. In this way, by switching the moving-in state or the moving-out state of the second blade 310, it is possible to enable the axial flow fan to provide different air blowing amounts without changing the rotational speed of the axial flow fan, or to obtain a larger air blowing amount at the same rotational speed.

Optionally, the removed state of the second blade 310 includes partial removal or full removal. It should be noted that, the partial removal means that a part of the second blade 310 moves out of the accommodating cavity from the opening, and another part is located in the accommodating cavity; the total removal means that the second blade 310 is completely removed from the accommodating chamber and is connected with the first blade 200 to provide a larger area of the air supply blade for the axial flow fan.

By adopting the axial flow fan provided by the embodiment of the disclosure, the second blade is arranged in the hollow accommodating cavity in the first blade, and the second blade can be moved into or out of the accommodating cavity by controlling the rotation of the second blade. When the second blade is in the moving-in state, namely, the second blade moves into the accommodating cavity through the opening, the axial flow fan can provide smaller air quantity; when the second blade is in the moving-out state, namely, when the second blade moves out of the accommodating cavity through the opening, the second blade can be combined with the first blade, so that the blade area of the axial flow fan for acting can be effectively increased when the axial flow fan operates, the air supply air quantity of the axial flow fan is increased, the air supply air quantity can be increased under the condition that the rotating speed of the axial flow fan is not changed, or the larger air supply air quantity can be obtained under the condition that the rotating speed of the axial flow fan is higher.

As shown in connection with fig. 3, in some embodiments, the second blade 310 includes a rotating end 311 and a moving end 312, the moving end 312 being rotatable about the rotating end 311 to controllably shift in translation between an out-of-state and an in-of-state.

The vane switching mechanism 300 further includes a pivot shaft 320 and a drive assembly 330.

The pivot shaft 320 is disposed through the rotating end 311 and fixedly connected with the first blade 200.

The driving assembly 330 is drivingly connected to the rotating end 311, and is configured to drive the rotating end 311 to rotate about the pivot shaft 320 in a first direction or a second direction, so that the moving end 312 can rotate about the rotating end 311, and at least translationally switch between an out-moving state and an in-moving state. Wherein the first direction and the second direction are opposite in rotation.

Alternatively, the pivot shaft 320 is disposed through the rotating end 311 and fixedly coupled to the first blade 200. In this way, the rotating end 311 of the second blade 310 can rotate about the pivot axis 320, and in turn, in the case where the rotating end 311 rotates about the pivot axis 320, the moving end 312 of the second blade 310 can be rotated about the rotating end 311, thereby allowing the moving end 312 to be controlled to translationally switch between the out-state and the in-state.

Optionally, the driving assembly 330 is drivingly connected to the rotating end 311, and is configured to drive the rotating end 311 to rotate about the pivot axis 320 along the first direction or the second direction, and drive the moving end 312 to rotate about the rotating end 311, so as to shift between the moving-out state and the moving-in state.

Alternatively, the first direction may be clockwise, the second direction may be counterclockwise, or the first direction may be counterclockwise, the second direction may be clockwise, and the embodiment of the present disclosure is not particularly limited.

In some embodiments, the drive assembly 330 includes a first drive gear 331, a first driven rack 332, and a drive motor.

The first driving gear 331 is disposed coaxially with the hub 100. The first driven rack 332 is fixedly disposed at the rotating end 311 and is engaged with the first driving gear 331. The output shaft of the driving motor is in driving connection with the first driving gear 331, and is used for driving the driving gear 310 to rotate along the clockwise direction or the anticlockwise direction so as to drive the first driven rack 332 to reciprocate along the length direction, so that the rotating end 311 rotates around the pivot shaft 320.

Alternatively, the first driving gear 331 is disposed inside the hub 100 and coaxially disposed with the hub 100. In this way, the first driving gear 331 can rotate around the axis of the hub 100, and drives the first driven rack 332 engaged with the first driving gear. Under the condition that the driving motor drives the first driving gear 331 to rotate along the clockwise direction or the anticlockwise direction, the driving motor can drive the first driven rack 332 to reciprocate along the length direction, so that the rotating end 311 rotates around the pivot shaft 320, and further the second blade 310 is shifted in translation between the moving-out state and the moving-in state.

Optionally, the rotating end 311 of each second vane 310 is provided with a first driven rack 332 to enable the plurality of second vanes 310 to be moved out of or into the receiving cavity in synchronization.

Alternatively, the second blade 310 may be controlled to be completely or partially removed from the receiving cavity by controlling the angle at which the first actuating gear 310 rotates in a clockwise or counterclockwise direction.

In some embodiments, the first driven rack 332 includes a first end and a second end, where the first end and the second end are both provided with a limiting member, and after the first driven rack 332 moves a set distance along a length direction thereof towards the first end/the second end, the first driving gear 331 abuts against the limiting member to form a stop fit.

In this way, after the first driven rack 332 moves along the length direction thereof towards the first end/second end by a set distance, the limiting piece located at the first end/second end of the first driven rack 332 can abut against the first driving gear 331, so as to limit the continuous movement of the first driven rack 332, prevent the first driven rack 332 from disengaging from the first driving gear 331, ensure the control of moving the second blade 310 out of or into the accommodating cavity, and improve the stability of the operation of the driving assembly 330.

As shown in connection with fig. 4-7, in some embodiments, hub 100 includes a first sidewall 110; the drive assembly 330 includes a second drive gear 333, a second driven rack 334, a guide rail 335, and a drive rod 336.

The second driving gear 333 is disposed inside the hub 100 and coaxially disposed with the hub 100. The second driven rack 334 is fixedly disposed at the rotating end 311 and is engaged with the second driving gear 333. The guide rail 335 is formed on the first sidewall 110 in a manner extending along the rotation direction of the second driving gear 333. The driving rod 336 is fixedly connected with the second driving gear 333 and forms a sliding fit with the guiding sliding rail 335.

Optionally, the guide rail 335 includes a first stop end and a second stop end. When the driving rod 336 slides along the first stop end to the second stop end, the second driving gear 333 can be driven to rotate clockwise/anticlockwise; the driving rod 336 may rotate the second driving gear 333 counterclockwise/clockwise when sliding along the second stop end to the first stop end. When the second driving gear 333 rotates along the clockwise direction or the counter-clockwise direction, the second driven rack 334 can be driven to reciprocate along the length direction thereof, so that the rotating end 311 rotates around the pivot shaft 320, and the second vane 310 can be shifted in translation between the moving-out state and the moving-in state.

Alternatively, the sliding of the drive rod 336 along the guide rail 335 may be manually controlled, or a driver may be provided by which the sliding of the drive rod 336 along the guide rail 335 is controlled.

In some embodiments, the guide rail 335 is an arcuate track that curves away from the hub 100 axis. That is, the guide rail 335 is formed on the first sidewall 110 along the movement track of the second driving gear 333. In this way, the accuracy and stability of the movement of the second driving gear 333 by the driving rod 336 are improved.

In some embodiments, the axial flow fan further includes a first magnetic attraction member and a second magnetic attraction member that attract each other, the first magnetic attraction member is disposed at two ends of the guide sliding rail 335, and the second magnetic attraction member is disposed on an outer peripheral wall surface of the driving rod 336.

Optionally, the guide rail 335 includes a first stop end and a second stop end. Namely, the first stop end and the second stop end are respectively provided with a first magnetic attraction piece. Since the second magnetic attraction member is provided on the outer peripheral wall surface of the drive lever 336. In this way, under the condition that the driving rod 336 moves to the first stop end/the second stop end, the driving rod 336 can be in attractive connection with the first stop end/the second stop end through the mutual attraction effect of the first magnetic attraction piece and the second magnetic attraction piece, so that the driving rod 336 is in a locking state at the first stop end/the second stop end under the condition that the axial flow fan rotates, the driving rod 336 is prevented from malfunctioning when the axial flow fan rotates, namely, from sliding under the influence of motion inertia, and therefore the working state of the second blade 310 is prevented from changing, namely, the stability of the moving-in state/the moving-out state of the second blade 310 is ensured.

In some embodiments, the first blade 200 includes a trailing edge side disposed opposite the leading edge side, the trailing edge side being formed with a notch 230 extending from the trailing edge side to the leading edge side.

By providing the notch 230, the frequency of shedding of the air flow passing therethrough can be disturbed. Specifically, the notch 230 may be formed at a position relatively closer to the outer circumference of the first blade 200. By providing the notch 230 on the first blade 200, the shedding frequency of the airflow is inconsistent during the use process of the axial flow fan of the embodiment, so that the running noise of the fan blade is effectively reduced.

In some embodiments, the notch 230 comprises a V-notch. The V-shaped notch has good noise reduction effect and is easy to process.

Embodiments of the present disclosure provide an axial flow fan including an axial flow fan as described above.

The axial flow fan provided by the embodiment of the disclosure comprises the axial flow fan, wherein the second blade is arranged in the hollow accommodating cavity in the first blade, and the second blade can be moved into or out of the accommodating cavity by controlling the rotation of the second blade. When the second blade is in the moving-in state, namely, the second blade moves into the accommodating cavity through the opening, the axial flow fan can provide smaller air quantity; when the second blade is in the moving-out state, namely, when the second blade moves out of the accommodating cavity through the opening, the second blade can be combined with the first blade, so that the blade area of the axial flow fan for acting can be effectively increased when the axial flow fan operates, the air supply air quantity of the axial flow fan is increased, the air supply air quantity can be increased under the condition that the rotating speed of the axial flow fan is not changed, or the larger air supply air quantity can be obtained under the condition that the rotating speed of the axial flow fan is higher.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. An axial flow fan, comprising:

a hub (100);

a plurality of first blades (200) arranged at intervals along the circumferential direction of the hub (100), wherein the first blades (200) are internally provided with hollow accommodating cavities, and the front edge sides of the first blades (200) are provided with openings;

the blade switching mechanism (300) comprises a second blade (310) rotatably arranged in the accommodating cavity, and the second blade (310) can be at least controlled to be switched in a translational mode between an out-of-position and an in-position, wherein the out-of-position comprises that the second blade (310) moves out of the accommodating cavity through the opening, and the in-position comprises that the second blade (310) moves into the accommodating cavity through the opening.

2. The axial flow fan according to claim 1, characterized in that the second blade (310) comprises a rotating end (311) and a moving end (312), the moving end (312) being rotatable about the rotating end (311) to be controlled to be translationally switched between the out-going state and the in-going state;

the blade switching mechanism (300) further includes:

the pivot shaft (320) penetrates through the rotating end (311) and is fixedly connected with the first blade (200);

and the driving assembly (330) is in driving connection with the rotating end (311) and is used for driving the rotating end (311) to rotate around the pivot shaft (320) along a first direction or a second direction so as to enable the moving end (312) to rotate around the rotating end (311), and at least the translational switching is performed between the moving-out state and the moving-in state, wherein the first direction and the second direction are opposite in rotation direction.

3. The axial flow fan according to claim 2, wherein the drive assembly (330) comprises:

a first drive gear (331) coaxially arranged with the hub (100);

the first driven rack (332) is fixedly arranged at the rotating end (311) and is meshed with the first driving gear (331);

and the output shaft of the driving motor is in driving connection with the first driving gear (331) and is used for driving the first driving gear (331) to rotate along a clockwise pointer or anticlockwise direction so as to drive the first driven rack (332) to reciprocate along the length direction of the first driven rack, so that the rotating end (311) rotates around the pivot shaft (320).

4. An axial fan according to claim 3, wherein the driven rack (332) comprises a first end and a second end, the first end and the second end are provided with limiting pieces, and after the driven rack moves a set distance along the length direction of the driven rack towards the direction of the first end/the second end, the driving gear (331) abuts against the limiting pieces to form a stop fit.

5. The axial flow fan according to claim 2, wherein the hub (100) comprises a first side wall (110);

the drive assembly includes:

a second drive gear (333) provided inside the hub (100) and coaxially provided with the hub (100);

the second driven rack (334) is fixedly arranged at the rotating end (311) and is meshed with the second driving gear (333);

a guide rail (335) formed on the first side wall (110) in an extending manner along the rotation direction of the second driving gear (333);

the driving rod (336) is fixedly connected with the second driving gear (333) and is in sliding fit with the guide sliding rail (335).

6. The axial flow fan according to claim 5, wherein the guide rail (335) is an arc-shaped rail curved in a direction away from an axial center of the hub (100).

7. The axial flow fan according to claim 5, further comprising a first magnetic attraction member and a second magnetic attraction member that attract each other, wherein the first magnetic attraction member is provided at both ends of the guide rail (335), and the second magnetic attraction member is provided on an outer peripheral wall surface of the driving lever (336).

8. The axial flow fan according to any one of claims 1 to 7, wherein the first blade (200) includes a trailing edge side arranged opposite to the leading edge side, the trailing edge side being formed with a notch (230) extending from the trailing edge side toward the leading edge side.

9. The axial flow fan of claim 8, wherein the notch (230) comprises a V-notch.

10. An axial flow fan comprising the axial flow fan according to any one of claims 1 to 9.