CN106930962B

CN106930962B - Fan blade structure and fan using same

Info

Publication number: CN106930962B
Application number: CN201710170506.0A
Authority: CN
Inventors: 倪祖根
Original assignee: Kingclean Electric Co Ltd
Current assignee: Kingclean Electric Co Ltd
Priority date: 2017-03-21
Filing date: 2017-03-21
Publication date: 2023-09-26
Anticipated expiration: 2037-03-21
Also published as: WO2018171085A1; CN106930962A

Abstract

The invention discloses a fan blade structure and a fan using the same, wherein the fan blade structure comprises a hub and a plurality of blades annularly and uniformly distributed on the outer peripheral surface of the hub, each blade comprises a hub connecting part connected with the hub, a sickle-shaped front edge, an S-shaped rear edge and a blade top edge positioned at the tail end of the outer side of the blade so as to connect the front edge and the rear edge, a blade tip is arranged between the blade top edge and the front edge, and the blade tip is in an arc shape; the included angle between the tangents L5 and L4 at the two ends of the top edge and the front edge of the blade, which are respectively connected with the blade tip, is a2, wherein the range of a2 is 40-50 degrees. The fan blade structure and the fan using the fan blade structure can ensure the air quantity and the air speed, and simultaneously, the noise emitted by the fan blade structure is small.

Description

Fan blade structure and fan using same

Technical Field

The invention relates to the technical field of household appliances, in particular to a fan blade structure and a fan using the same.

Background

The fan is a fan which is a tool for generating wind and taking cool in hot days, is a device for generating air flow by electric drive, and achieves the effect of cooling by generating air flow to take away heat of a human body through rotation of blades arranged in the fan after the fan is electrified. When the fan blades of the existing fan rotate, the distance for improving the air flow can only be increased by increasing the rotating speed of the fan blades, so that the traditional fan blades can generate larger wind resistance and larger wind noise, and the generated air flow blows on a human body very uncomfortable; in addition, conventional blades may generate very limited distances for airflow, resulting in a reduced use experience for the fan product.

Disclosure of Invention

The invention aims to provide a fan blade structure and a fan using the same, which can ensure the air quantity and the air speed and simultaneously generate less noise.

To achieve the purpose, the invention adopts the following technical scheme:

in one aspect, the invention provides a fan blade structure, which comprises a hub and a plurality of blades annularly and uniformly distributed on the outer peripheral surface of the hub, wherein each blade comprises a hub connecting part connected with the hub, a sickle-shaped front edge, an S-shaped rear edge and a blade top edge positioned at the tail end of the outer side of the blade so as to connect the front edge and the rear edge, a blade tip is arranged between the blade top edge and the front edge, and the blade tip is in an arc shape; the included angle between the tangents L5 and L4 at the two ends of the top edge and the front edge of the blade, which are respectively connected with the blade tip, is a2, wherein the range of a2 is 40-50 degrees.

Preferably, a2 is 45 °.

Preferably, the rear edge comprises a rear edge end section connected to the hub, a rear edge middle section connected to the rear edge end section and a rear edge front section connected to the rear edge middle section, and the rear edge front section is connected to the blade top edge, wherein the bending direction of the rear edge end section is opposite to the bending direction of the rear edge front section, and the bending direction of the rear edge front section is towards the front edge.

Preferably, the radius of curvature of the trailing edge end section is smaller than the radius of curvature of the trailing edge front section, and the length of the trailing edge end section is smaller than the length of the trailing edge front section.

Preferably, a line between a center O point of the hub and a midpoint a of the hub connection portion of the blade is L1, a line between the center O point of the hub and a circular arc center B of the blade tip is L2, and an angle between L1 and L2 is a1, wherein a1 ranges from 25 ° to 30 °.

Preferably, a circle centered on the center O point of the hub and having a radius Rb which is half of the distance from the center O point of the hub to the center of the blade tip, is defined as an intermediate reference circle, an intersection point of the intermediate reference circle and L1 is defined as point C, a tangent line of the intermediate reference circle at point C is defined as L3, and an angle between L3 and L4 is defined as a3, wherein a3 ranges from 22 ° to 28 °.

Preferably, a1 is 27 ° and a3 is 25 °.

Preferably, the hub is cylindrical.

As a preference, the number of blades is 7.

On the other hand, the invention also provides a fan which comprises the fan blade structure.

The beneficial effects of the invention are as follows:

according to the fan blade structure and the fan using the same, the hub connecting part of each blade is in a spiral shape, the rear edge is in an S shape, the front edge is in a sickle shape, the blade tip is arranged between the front edge and the top edge of the blade, the included angle between the tangents L5 and L4 of the blade tip, which are respectively connected with the top edge of the blade and the two ends of the front edge, is a2, wherein the range of a2 is 40-50 degrees, and the blade tip can break air barriers formed by air, so that the wind resistance of the blade is effectively reduced, and the noise is reduced.

Drawings

Fig. 1 is a schematic front perspective view of a fan blade structure according to embodiment 1 of the present invention;

fig. 2 is a schematic front perspective view of a fan blade structure according to embodiment 1 of the present invention;

FIG. 3 is a schematic view of a rear perspective view of a fan blade structure according to embodiment 1 of the present invention;

FIG. 4 is a schematic side view of the fan blade structure in FIG. 1 in the direction A;

FIG. 5 is a schematic front view of the fan blade structure of FIG. 1;

fig. 6 is a schematic representation of parameter expression of labeling parameters of the fan blade structure in fig. 5.

In the figure: 1-a hub; 2-leaf blades;

21-a hub connection; 22-trailing edge; 23-blade top edge; 24-front edge; 25-blade tips; 26-positive pressure side; 27-negative pressure face;

221-trailing edge end segment; 222-a trailing edge midsection; 223-trailing edge front section.

Detailed Description

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

It should be noted that, in the present invention, the terms "center", "front", "rear", "top", "bottom", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and are not used to indicate or imply that the apparatus or element referred to must be constructed and operated in this orientation or in a specific orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1 to 6, a fan blade structure includes: the hub 1 and a plurality of blades 2 which are annularly and uniformly distributed on the outer peripheral surface of the hub 1, wherein the hub 1 is used for being connected with a rotating shaft of a motor, so that the motor drives the fan blade structure to rotate, and when the fan blade structure rotates, the blades 2 guide air and generate air flow; the three-dimensional shape of the blade 2 is an important factor for determining the air flow characteristics in the fan, for example, the three-dimensional shape of the blade 2 may be expressed by a swing angle, an inside-outside ratio, an oblique angle, a maximum bending amount, and a maximum bending position, and these constituent factors, which define the shape of the blade 2 by three-dimensional concepts, are often used in the aerodynamic field.

In the present embodiment, since the shape of the vane 2 is related to the flow of the fluid, specifically, the airflow formed by the vane 2 moves to the front side of the vane 2 after passing through the rear side of the vane 2, herein, one surface of the vane before the fluid is sucked by the vane 2 is defined as a negative pressure surface 27, and the other surface of the vane, which is not visible on the reverse side, is defined as a positive pressure surface 26, that is, the front side of the vane 2 is a positive pressure surface 26, and the reverse side is a negative pressure surface 27; further, when the blade 2 rotates, a portion where the air flowing into the blade 2 comes into contact with the blade 2 is defined as a front edge 24, and a portion where the air is separated from the blade is defined as a rear edge 22; still further, the portion of the blade 2 connected to the hub 1 is defined as a hub connection portion 21; the end of the blade 2 in the radial direction, i.e. the part connecting the front edge 24 and the rear edge 22 of the blade, is defined as the blade top edge 23.

The blade structure as described above is rotated by the motor drive and the fluid flows from top to bottom due to the pressure difference between the negative pressure surface 27 and the positive pressure surface 26 of the blade 2, i.e. the air at the rear side of the blade structure flows to the front side due to the constant rotation of the blade structure.

As shown in fig. 1 to 6, an embodiment of the present invention provides a fan blade structure, in which each blade 2 includes a spiral hub connection portion 21 connected to the hub 2, a sickle-shaped front edge 24, an S-shaped rear edge 22, and a blade top edge 23 located at an outer end of the blade 2 to connect the front edge 24 and the rear edge 22. The hub connection portion 21 is deflected at an angle of 40 ° to 50 ° with respect to the rotational axis of the hub 1, which is preferably 45 ° in the present invention. A blade tip 25 is arranged between the blade top edge 23 and the front edge 24, and the blade tip 25 is arc-shaped. The distance between the arc midpoint B of the blade tip 25 and the center O of the hub 1 is Ra, a circle with Ra as a radius is a reference circle, the radius Ra of which is a reference radius of the blade of the fan blade structure, and the center O of the hub 1 is the center.

In the present embodiment, the hub 1 is cylindrical, and the number of blades 2 provided on the outer periphery of the hub 1 is preferably a single number, and in the present invention, 7 blades are provided.

In particular, in the present embodiment, the blade tip 25 connects the blade top edge 23 and the front edge 24 at both ends at the tangents L5, L4, respectively, at an angle a2, wherein a2 ranges from 40 ° to 50 °. For example, a2 may be 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 °, 50 °, and preferably a2 is 45 °, which angle may enable the blade tip 25 to effectively reduce wind resistance of the blade during operation, which may be beneficial for noise reduction.

As shown in fig. 1 to 6, the rear edge 22 includes a rear edge end section 221 connected to the hub 1, a rear edge middle section 222 connected to the rear edge end section 221, and a rear edge front section 223 connected to the rear edge middle section 222, and the rear edge front section 223 is connected to the blade top edge 23, wherein the bending direction of the rear edge end section 221 is opposite to the bending direction of the rear edge front section 223, and the bending direction of the rear edge front section 223 faces the front edge 24. Preferably, the radius of curvature of the trailing edge end section 221 is less than the radius of curvature of the trailing edge front section 223, and the arc length of the trailing edge end section 221 is less than the arc length of the trailing edge front section 223.

As one preferable example, a line between the center O point of the hub 1 and the midpoint a of the hub connection portion 21 of the blade 2 is L1, a line between the center O point of the hub 1 and the arc center B of the blade tip 25 is L2, and an angle between L1 and L2 is a1, wherein a1 ranges from 25 ° to 30 °. For example, a1 may be 25 °, 26 °, 27 °, 28 °, 29 °, 30 °, and more preferably, a1 is 27 °, and within the above range, different numbers of blades 2 may be provided as required within the circumference of the hub, so as to optimize dynamic balance during rotation of the blades, and reduce noise during high-speed rotation of the blades.

As one preferable example, a circle centered on the center O point of the hub 1 and having a radius Rb which is half of the distance from the center O point of the hub 1 to the center of the arc of the blade tip 25 is defined as an intermediate reference circle, the intersection point of the intermediate reference circle and L1 is defined as point C, the tangent line of the intermediate reference circle at point C is defined as L3, and the angle between L3 and L4 is defined as a3, wherein a3 ranges from 22 ° to 28 °. For example, a3 may be 22 °, 23 °, 24 °, 25 °, 26 °, 27 °, 28 °, and more preferably, a3 is 25 °.

Further, the length of the vertical line segment from the intersection of the intermediate reference circle and the rear edge 22 of the blade 2 to L1 is set to L6, and the overwind area of the positive pressure surface 26 and the negative pressure surface 27 of the blade 2 can be well adjusted by adjusting the length of L6.

In addition, the invention provides a fan which comprises the fan blade structure.

The fan blade structure of the fan of the invention rotates clockwise when observed from the positive pressure surface. When the blade rotates, low noise can be realized through the sickle shape at the front edge, the S shape at the rear edge and the matching of the blade tips.

The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. The utility model provides a flabellum structure, includes wheel hub (1) and annular equipartition are in a plurality of blades (2) of the outer peripheral face of wheel hub (1), its characterized in that, every blade (2) are including connecting in wheel hub connecting portion (21) of wheel hub (1), hook-shaped front edge (24), S-shaped trailing edge (22) and be located the end in the blade (2) outside is in order to connect front edge (24) with blade top edge (23) of trailing edge (22), be equipped with apex (25) between blade top edge (23) and front edge (24), apex (25) are circular-arcly; the blade tip (25) is respectively connected with the blade top edge (23) and tangents L5 and L4 at two ends of the front edge (24), wherein an included angle between the tangents L5 and L4 is a2, and the range of a2 is 40-50 degrees;

the axial length of the hub connecting part (21) along the rotating shaft of the hub (1) is equal to the axial length of the outer peripheral surface of the hub (1);

the hub connecting part (21) deflects relative to the rotating shaft of the hub (1) to form an angle of 40-50 degrees;

setting a connecting line between a center O point of the hub (1) and a midpoint A of the hub connecting part (21) of the blade (2) as L1, setting a connecting line between the center O point of the hub (1) and a circular arc center B of the blade tip (25) as L2, and setting an included angle between L1 and L2 as a1, wherein the range of a1 is 25-30 degrees;

the midline of each blade (2) is located on either side of L1, the midline of each blade (2) being between the front edge (24) and the rear edge (22) and being equidistant from the front edge (24) and the rear edge (22).

2. The fan blade structure of claim 1, wherein a2 is 45 °.

3. The blade arrangement according to claim 1, wherein the rear edge (22) comprises a rear edge end section (221) connected to the hub (1), a rear edge middle section (222) connected to the rear edge end section (221) and a rear edge front section (223) connected to the rear edge middle section (222), the rear edge front section (223) being connected to the blade top edge (23), wherein,

the bending direction of the rear edge end section (221) is opposite to the bending direction of the rear edge front section (223), and the bending direction of the rear edge front section (223) is towards the front edge (24).

4. A fan blade structure according to claim 3, characterized in that the bending radius of the trailing edge end section (221) is smaller than the bending radius of the trailing edge front section (223), and the length of the trailing edge end section (221) is smaller than the length of the trailing edge front section (223).

5. The blade structure according to claim 1, characterized in that a circle centered on the center O point of the hub (1) and centered on half the distance from the center O point of the hub (1) to the center of the arc of the blade tip (25) is defined as an intermediate reference circle, the intersection point of the intermediate reference circle and L1 is defined as point C, the tangent line of the intermediate reference circle at point C is defined as point L3, and the angle between L3 and L4 is a3, wherein a3 ranges from 22 ° to 28 °.

6. The fan blade structure of claim 5, wherein a1 is 27 ° and a3 is 25 °.

7. A fan blade structure according to any of claims 1-6, characterized in that the hub (1) is cylindrical.

8. A fan blade structure according to any of claims 1-6, characterized in that the number of blades (2) is 7.

9. A fan comprising a blade arrangement according to any one of claims 1-8.