CN215927850U - Fan structure and air supply equipment - Google Patents

Abstract

The utility model relates to a fan structure and air supply equipment, which particularly comprises a motor, fan blades, a first fixing piece and a second fixing piece, wherein the motor is provided with a main shaft, the main shaft comprises a shaft body, the fan blades are sleeved on the shaft body, and the surfaces of the fan blades facing the motor are protruded to form a first matching part; the first fixing piece and the second fixing piece are all sleeved on the shaft body and are respectively arranged at two ends of the fan blade in a limiting mode, so that the fan blade is limited from two sides of the fan blade in a clamping mode along the axial direction of the shaft body, and the degree of freedom of the fan blade for the shaft body to move axially is limited. The spindle further comprises a limiting part arranged on the spindle body, and the limiting part protrudes along the radial direction of the spindle body; the first matching portion is provided with a limiting groove which is formed by extending the shaft body in the radial direction, the limiting portion is embedded in the limiting groove in a rotation stopping and clamping mode and keeps the fan blade and the main shaft to rotate synchronously, therefore, the fan blade is limited in rotation stopping along the circumferential direction of the main shaft, and the freedom degree of the fan blade relative to the shaft body in circumferential rotation is limited.

Description

Fan structure and air supply equipment

Technical Field

The utility model relates to the technical field of air supply, in particular to a fan structure and air supply equipment.

Background

An electric fan, also called fan and fan blower for short, is a household appliance which uses a motor to drive fan blades to rotate so as to accelerate the circulation of air, is mainly used for cooling, relieving summer heat and circulating air, and is widely used in places such as families, classrooms, offices, shops, hospitals, hotels and the like.

The conventional fan comprises a motor and a fan blade, the fan blade is tightly assembled on a motor spindle and rotates along with the motor spindle, so that the fan blade rotates to supply air, and in the market at present, the motor spindle and the fan blade are fixed by a D-shaped shaft and the fan blade in a rotation stopping fit mode, so that the fan is prevented from rotating relative to the spindle in the blowing process.

According to the structure, the fan blade and the main shaft are poor in fixed dynamic balance, the fan blade is easy to shake when rotating, the running stability of the fan is poor, and the use experience is poor.

SUMMERY OF THE UTILITY MODEL

Based on the technical effects of stable operation and good use experience, the fan structure and the air supply equipment are provided for solving the problem that the existing fan is poor in operation stability.

A fan structure comprising:

the motor is provided with a main shaft, and the main shaft comprises a shaft body;

the fan blade is sleeved on the shaft body, and a first matching part is formed on the surface of the fan blade, facing the motor, in a protruding mode; and

the first fixing piece and the second fixing piece are sleeved on the shaft body and are respectively arranged at two axial ends of the fan blade in a limiting manner;

the spindle further comprises a limiting part arranged on the spindle body, and the limiting part protrudes along the radial direction of the spindle body; the first matching portion is provided with a limiting groove which is formed along the radial extension of the shaft body, and the limiting portion is clamped in the limiting groove in a rotation stopping manner and keeps the fan blade and the main shaft to rotate synchronously.

In one embodiment, the shaft body is provided with an installation groove along the circumferential direction of the shaft body, and the first fixing piece is sleeved on the shaft body and is embedded in the installation groove in a clamping manner;

at least part of the first fixing piece protrudes along the radial direction of the shaft body and is abutted against the first matching part in the axial direction of the shaft body.

In one embodiment, the first matching part comprises at least one arc-shaped boss protruding out of the fan blade and facing the surface of the motor, and the diameter of a virtual circle where the concave surface of the at least one arc-shaped boss is located is matched with the diameter of the shaft body;

the part of the first fixing piece protruding out of the shaft body is mutually abutted with the surface of the at least one arc-shaped boss facing the motor.

In one embodiment, the first fixing member includes a sleeve portion and two elastic arms respectively disposed at two opposite ends of the sleeve portion, and the two elastic arms are independent from each other and jointly define an opening;

the two elastic arms are controlled to elastically deform and change the size of the opening, so that the sleeving part is sleeved on the shaft body.

In one embodiment, the first fixing member is a snap spring.

In one embodiment, the limiting part comprises two limiting columns arranged on the shaft body, each limiting column protrudes in the radial direction of the shaft body, the first matching part comprises two arc-shaped bosses, and concave surfaces of the two arc-shaped bosses are arranged oppositely;

two adjacent both ends interval formation one at the circumference of two arc boss the spacing groove, every spacing post block respectively inlay in every spacing inslot.

In one embodiment, a connecting line between the axial lines of the two limiting columns is intersected with the axial line of the shaft body.

In one embodiment, a threaded connection end is arranged on one side of the shaft body, which is far away from the motor, and the second fixing piece is in threaded connection with the threaded connection end.

In one embodiment, a second matching part is formed on the surface of the fan blade, which faces away from the motor;

when the second fixing piece is in threaded connection with the threaded connection end, the second fixing piece is abutted against the second matching portion in the axial direction of the shaft body.

According to another aspect of the present invention, an air supply device is provided, which comprises the fan structure provided in any one of the above embodiments.

The fan structure can be applied to air supply equipment such as a household fan and the like for supplying air. The fan blade fixing device comprises a motor, fan blades, a first fixing piece and a second fixing piece, wherein the motor is provided with a main shaft, the main shaft comprises a shaft body, the fan blades are sleeved on the shaft body, and a first matching part is formed on the surface of the fan blades, facing the motor, in a protruding mode; the first fixing piece and the second fixing piece are all sleeved on the shaft body and are respectively arranged at two ends of the fan blade in a limiting mode, so that the fan blade is limited from two sides of the fan blade in a clamping mode along the axial direction of the shaft body, and the degree of freedom of the fan blade for the shaft body to move axially is limited. The spindle further comprises a limiting part arranged on the spindle body, and the limiting part protrudes along the radial direction of the spindle body; the first matching portion is provided with a limiting groove which is formed by extending the shaft body in the radial direction, the limiting portion is embedded in the limiting groove in a rotation stopping and clamping mode and keeps the fan blade and the main shaft to rotate synchronously, therefore, the fan blade is limited in rotation stopping along the circumferential direction of the main shaft, and the freedom degree of the fan blade relative to the shaft body in circumferential rotation is limited. Therefore, the fan blades are prevented from oscillating or moving in the synchronous rotation process along with the motor spindle from the axial direction and the circumferential direction, the fan structure is stable in operation, and the use experience is improved.

Drawings

Fig. 1 is a schematic view of a split structure of a fan structure provided by the present invention;

FIG. 2 is a schematic diagram of the overall structure of the fan structure provided in FIG. 1;

FIG. 3 is a schematic diagram of the structure of the motor in the fan configuration provided in FIG. 1;

fig. 4 is a schematic structural view of a fan blade in the fan structure provided in fig. 1;

fig. 5 is a schematic structural view of a second fixing member in the fan blade structure provided in fig. 1.

Reference numerals: 100. a fan structure; 10. a motor; 11. a drive section; 12. a main shaft; 121. a shaft body; 1211. mounting grooves; 1212. a threaded connection end; 122. a limiting part; 1221. a limiting column; 20. a fan blade; 22. a first mating portion; 221. a boss; 24. a limiting groove; 25. a second mating portion; 30. a first fixing member; 31. a housing portion; 311. a resilient wall; 32. an opening; 40. a second fixing member; 41. a threaded hole; 42. a mating surface.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 4, an embodiment of the present invention provides a fan structure 100, which can be applied to an air supply device such as a household fan for supplying air. The fan blade fixing device specifically comprises a motor 10, a fan blade 20, a first fixing piece 30 and a second fixing piece 40, wherein the motor 10 is provided with a main shaft 12, the main shaft 12 comprises a shaft body 121, the fan blade 20 is sleeved on the shaft body 121, the first fixing piece 30 and the second fixing piece 40 are both sleeved on the shaft body 121 and respectively arranged at two axial ends of the fan blade 20 in a limiting mode, so that the fan blade 20 is clamped from two opposite ends of the fan blade 20 along the axial direction of the shaft body 121, and the freedom degree of the fan blade 20 relative to the main shaft 12 in axial movement is limited. The surface of the fan blade 20 facing the motor 10 protrudes to form a first matching portion 22, the first matching portion 22 has a limiting groove 24 extending along the axial body 121 in a radial direction, the spindle 12 further includes a limiting portion 122 disposed on the axial body 121, the limiting portion 122 protrudes along the axial body 121 in the radial direction, the limiting portion 122 is embedded in the limiting groove 24 in a stop-rotation manner and keeps the fan blade 20 and the spindle 12 rotating synchronously, so that the fan blade 20 is limited in the stop-rotation manner along the circumferential direction of the spindle 12, and the freedom degree of the fan blade 20 rotating along the circumferential direction relative to the axial body 121 is limited. And further avoid fan blade 20 to produce vibration or removal in the synchronous rotation process along with motor 10 from axial and circumference two aspects for fan structure 100 operates steadily, has improved and has used the experience sense.

It can be understood that, in the blower fan structure 100 provided by the present invention, in order to avoid the fan blade 20 from oscillating or moving in the process of rotating along with the main shaft 12 of the motor 10, only the limiting portion 122 needs to be made on the main shaft 12, the manufacturing is simple, and the main shaft 12 of the conventional motor 10 does not need to be greatly modified, so that the production cost is greatly reduced.

Referring to fig. 1 to 2, in one embodiment, the motor 10 further includes a driving portion 11, and the driving portion 11 is in driving connection with the main shaft 12 and is configured to drive the main shaft 12 to rotate, so as to drive the fan blades 20 sleeved on the shaft body 121 to rotate along with the main shaft 12, thereby realizing air supply by the fan blades 20.

Referring to fig. 1 to 2, in one embodiment, the shaft body 121 is provided with a mounting groove 1211 along a circumferential direction thereof, the mounting groove 1211 provides a location for mounting the first fixing element 30 and the shaft body 121, the first fixing element 30 is sleeved on the shaft body 121 and is embedded in the mounting groove 1211, and at least a portion of the first fixing element 30 protrudes in a radial direction of the shaft body 121 and abuts against the first matching portion 22 in an axial direction of the shaft body 121. Therefore, when the fan structure 100 operates, the freedom degree of the fan blade 20 moving along the axial direction relative to the main shaft 12 is limited, the fan blade 20 is prevented from shaking, and the fan blade 20 moves stably.

Specifically, the first matching portion 22 includes at least one arc-shaped boss 221 protruding from the fan blade 20 and facing the surface of the driving portion 11 of the motor 10, and a diameter of a virtual circle where a concave surface of the at least one arc-shaped boss 221 is located is matched with a diameter of the shaft body 121, so that the shaft body 121 can pass through the first matching portion 22 to be assembled with the fan blade 20. The part of the first fixing member 30 protruding out of the shaft body 121 and the surface of the at least one arc-shaped boss 221 facing the motor 10 are abutted against each other, so that the fan blade 20 is limited from one end of the shaft body 121.

Referring to fig. 2, in one embodiment, the position-limiting portion 122 includes two position-limiting columns 1221 disposed on the shaft body 121, and each position-limiting column 1221 protrudes along a radial direction of the shaft body 121. The first matching part 22 comprises two arc-shaped bosses 221, the concave surfaces of the two arc-shaped bosses 221 are arranged oppositely, two ends of the two arc-shaped bosses 221, which are adjacent to each other in the circumferential direction, are spaced to form a limiting groove 24, so that two limiting grooves 24 are formed, and each limiting column 1221 is respectively clamped and embedded in each limiting groove 24. Through the rotation stopping matching of the two limiting columns 1221 and the two limiting grooves 24, in the synchronous rotation process of the fan blade 20 along with the main shaft 12 of the motor 10, the limitation of the freedom degree of the fan blade 20 moving along the circumferential direction relative to the main shaft 12 is further enhanced, so that the running stability of the fan structure 100 is ensured.

It can be understood that the number of the limiting columns 1221 is not limited, and at least one limiting column may be provided, and the two limiting columns 1221 are designed as an optimal scheme on the premise of ensuring the rotation stopping effect and reducing the cost.

Preferably, a connecting line between the axes of the two limiting columns 1221 intersects with the axis of the shaft body 121, that is, the two limiting columns 1221 are uniformly arranged at intervals along the circumferential direction of the shaft body 121, so that each limiting column 1221 is stressed the same in the limiting groove 24, a better rotation stopping effect is ensured, and the motion stability of the fan structure 100 is further improved.

In one embodiment, a threaded connection end 1212 is disposed on a side of the shaft body 121 away from the driving portion 11 of the motor 10, and the second fixing element 40 is in threaded connection with the threaded connection end 1212, so that the fan blade 20 is limited on the shaft body 121 from the other end of the shaft body 121, and the fan blade 20 and the motor 10 are fastened at the same time.

Referring to fig. 4, in one embodiment, the surface of the fan blade 20 facing away from the driving portion 11 of the motor 10 and facing the second fixing element 40 forms a second matching portion 25, and when the second fixing element 40 is screwed to the screw connection end 1212, the second fixing element 40 and the second matching portion 25 abut against each other in the axial direction of the shaft body 121, so that the fan blade 20 and the motor 10 are fastened, and the relative movement of the fan blade 20 on the main shaft 12 in the axial direction can be limited.

Referring to fig. 4, in one embodiment, the first fixing member 30 includes a sleeve portion 31 and two elastic arms 311 respectively disposed at two opposite ends of the sleeve portion 31, wherein the two elastic arms 311 are independent from each other and jointly define an opening 32; the two elastic arms 311 are controlled to elastically deform and change the size of the opening 32, so as to sleeve the sleeve portion 31 on the shaft 121. In the installation process, after the motor 10 and the fan blade 20 are installed, the first fixing member 30 is clamped afterwards, and the elastic arm 311 is manually or mechanically pulled, so that the size of the opening 32 is increased until the shaft body 121 can smoothly enter the sleeving part 31 through the opening 32, and the first fixing member 30 is sleeved on the shaft body 121, that is, the installation of the first fixing member 30 does not affect the self-assembling sequence of the motor 10 and the fan blade 20, and the installation process is convenient to control and install, thereby simplifying the installation process and being simple to use.

In some embodiments, the first fixing element 30 may be a snap spring, and in other embodiments, the first fixing element 30 may also be another structure capable of achieving convenient installation and sleeving, which is not limited herein.

Referring to fig. 5, specifically, the second fixing member 40 has a threaded hole 41 and a mating surface 42, and when the second fixing member 40 is mated with the shaft body 121, the threaded connection end 1212 extends into the threaded hole 41 until the mating surface 42 abuts against the second mating portion 25, which indicates that the second fixing member 40 is mounted in place.

In one embodiment, a rotation mark is arranged on a surface of the second fixing member 40, which faces away from the fan blade 20, and the rotation mark indicates a rotation direction in which the second fixing member 40 is fastened and detached, so that the operation of a user is facilitated, and the use experience of the user is further improved.

According to another aspect of the present invention, an air supply device, such as a household fan, is provided, which can be placed in any place for blowing air, including the fan structure 100 provided in any of the above embodiments, in the air supply device provided in the present invention, the fan blade 20 is sleeved on the shaft body 121, and the first fixing member 30 and the second fixing member 40 are both sleeved on the shaft body 121 and respectively disposed at two axial ends of the fan blade 20 in a limiting manner, so as to clamp the fan blade 20 from two opposite ends of the fan blade 20 along the axial direction of the shaft body 121, and limit the degree of freedom of the fan blade 20 moving along the axial direction relative to the main shaft 12. The surface of the fan blade 20 facing the motor protrudes to form a first matching portion 22, the first matching portion 22 is provided with a limit groove 24 which is formed by extending along the axial body 121 in the radial direction, the spindle 12 further comprises a limit portion 122 which is arranged on the axial body 121, the limit portion 122 protrudes along the axial direction of the axial body 121, the limit portion 122 is embedded in the limit groove 24 in a stop-rotation manner and keeps the fan blade 20 and the spindle 12 to rotate synchronously, so that the fan blade 20 is limited in stop-rotation manner along the circumferential direction of the spindle 12, the freedom degree of the fan blade 20 relative to the axial body 121 in circumferential rotation is limited, and the fan blade 20 is prevented from oscillating or moving along with the motor 10 in the synchronous rotation process from the axial direction and the circumferential direction, so that the fan structure 100 operates stably, and the use experience of the air supply device is improved.

Specifically, in the installation process of the air supply equipment, the motor 10 and the fan blade 20 can be assembled firstly, and then the first fixing part 30 is sleeved, so that the installation process is simplified, the manufacturing process of the air supply equipment is simple, and the control is convenient.

The fan structure 100 and the air supply device provided by the utility model have the following advantages:

(1) the first fixing member 30 and the second fixing member 40 are both sleeved on the shaft body 121 and respectively limited at two axial ends of the fan blade 20, so that the fan blade 20 is clamped from two opposite ends of the fan blade 20 along the axial direction of the shaft body 121, and the freedom degree of the fan blade 20 moving along the axial direction relative to the main shaft 12 is limited;

(2) the main fan blade 20 is provided with a first matching part 22 protruding from the surface facing the motor, the first matching part 22 is provided with a limit groove 24 extending along the radial direction of the shaft body 121, the main shaft 12 further comprises a limit part 122 arranged on the shaft body 121, the limit part 122 protrudes along the radial direction of the shaft body 121, the limit part 122 is embedded in the limit groove 24 in a stop-rotation manner and keeps the fan blade 20 and the main shaft 12 rotating synchronously, so that the fan blade 20 is limited in the stop-rotation manner along the circumferential direction of the main shaft 12, and the freedom degree of the fan blade 20 rotating along the circumferential direction relative to the shaft body 121 is limited;

(3) the fan blade 20 is prevented from oscillating or moving in the synchronous rotation process along with the motor 10 from the axial direction and the circumferential direction, so that the fan structure 100 runs stably, and the use experience is improved.

(4) The shaft body 121 is provided with a mounting groove 1211 along the circumferential direction, the mounting groove 1211 provides positioning for the mounting of the first fixing piece 30 and the shaft body 121, the first fixing piece 30 is sleeved on the shaft body 121 and is clamped and embedded in the mounting groove 1211, at least part of the first fixing piece 30 protrudes along the radial direction of the shaft body 121, and is abutted against the first matching part 22 in the axial direction of the shaft body 121, so that when the fan structure 100 operates, the freedom degree of the fan blade 20 moving along the axial direction relative to the main shaft 12 is limited, the fan blade 20 is prevented from shaking, and the fan blade 20 is enabled to move stably;

(5) the second matching part 25 is formed by arranging the driving part 11 of the fan blade 20 back to the motor 10 and the surface facing the second fixing piece 40, when the second fixing piece 40 is in threaded connection with the threaded connection end 1212, the second fixing piece 40 and the second matching part 25 are abutted against each other in the axial direction of the shaft body 121, so that the fan blade 20 and the motor 10 are fastened, and the relative movement of the fan blade 20 on the main shaft 12 along the axial direction can be limited;

(5) by arranging the first fixing member 30 to include the sleeving part 31 and the elastic arms 311 respectively arranged at two opposite ends of the sleeving part 31, the two elastic arms 311 are independent from each other and define an opening 32 together; the two elastic arms 311 are controlled to elastically deform and change the size of the opening 32, so as to sleeve the sleeve portion 31 on the shaft 121. In the installation process, after the motor 10 and the fan blade 20 are installed, the first fixing member 30 is clamped, and the elastic arm 311 is manually or mechanically pulled, so that the size of the opening 32 is increased until the shaft body 121 can smoothly enter the sleeving part 31 through the opening 32, and the first fixing member 30 is sleeved on the shaft body 121, that is, the installation of the first fixing member 30 does not affect the self-assembly sequence of the motor 10 and the fan blade 20, and the installation process is convenient to control and install, and is simplified.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A fan structure, comprising:

a motor (10) having a spindle (12), the spindle (12) including a shaft body (121);

the fan blade (20) is sleeved on the shaft body (121), and a first matching part (22) is formed on the surface, facing the motor (10), of the fan blade (20) in a protruding mode; and

the first fixing piece (30) and the second fixing piece (40) are sleeved on the shaft body (121) and are respectively limited and arranged at two axial ends of the fan blade (20);

the spindle (12) further comprises a limiting part (122) arranged on the shaft body (121), and the limiting part (122) protrudes along the radial direction of the shaft body (121); the first matching part (22) is provided with a limiting groove (24) which extends along the radial direction of the shaft body (121), and the limiting part (122) is clamped in the limiting groove (24) in a rotation stopping manner and keeps the fan blade (20) and the main shaft (12) to rotate synchronously.

2. The fan structure according to claim 1, wherein the shaft body (121) is provided with a mounting groove (1211) along a circumferential direction thereof, and the first fixing member (30) is sleeved on the shaft body (121) and is embedded in the mounting groove (1211);

wherein at least a part of the first fixing member (30) protrudes in a radial direction of the shaft body (121) and abuts against the first fitting portion (22) in an axial direction of the shaft body (121).

3. The fan structure according to claim 2, wherein the first fitting portion (22) comprises at least one arc-shaped boss (221) protruding from the fan blade (20) and facing the surface of the motor (10), and the diameter of a virtual circle in which the concave surface of the at least one arc-shaped boss (221) is located is matched with the diameter of the shaft body (121);

the part of the first fixing piece (30) protruding out of the shaft body (121) and the surface of the at least one arc-shaped boss (221) facing the motor (10) are abutted against each other.

4. The fan structure according to claim 3, wherein the first fixing member (30) comprises a sleeve portion (31) and two elastic arms (311) respectively disposed at two opposite ends of the sleeve portion (31), and the two elastic arms (311) are independent from each other and jointly define an opening (32);

the two elastic arms (311) are controlled to elastically deform and change the size of the opening (32), so that the sleeving part (31) is sleeved on the shaft body (121).

5. The fan structure according to claim 3, wherein the first fixing member (30) is a clamp spring.

6. The fan structure according to claim 3, wherein the limiting portion (122) comprises two limiting columns (1221) arranged on the shaft body (121), each limiting column (1221) protrudes in a radial direction of the shaft body (121), the first matching portion (22) comprises two arc-shaped bosses (221), and concave surfaces of the two arc-shaped bosses (221) are arranged oppositely;

two ends of the two arc-shaped bosses (221) which are adjacent to each other in the circumferential direction are spaced to form the limiting groove (24), and each limiting column (1221) is respectively embedded in each limiting groove (24).

7. The fan structure according to claim 6, wherein a connecting line between the axial lines of the two limiting columns (1221) intersects with the axial line of the shaft body (121).

8. The fan structure according to claim 2, wherein a threaded end (1212) is provided on a side of the shaft body (121) away from the motor (10), and the second fixing member (40) is threadedly connected to the threaded end (1212).

9. The fan structure according to claim 8, wherein a second fitting portion (25) is formed on a surface of the fan blade (20) facing away from the motor (10);

when the second fixing member (40) is screwed to the screw connection end (1212), the second fixing member (40) and the second fitting portion (25) are abutted against each other in the axial direction of the shaft body (121).

10. An air supply arrangement, characterized by comprising a fan arrangement according to any of claims 1-9.

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