WO2018171085A1

WO2018171085A1 - Fan blade structure and fan using same

Info

Publication number: WO2018171085A1
Application number: PCT/CN2017/092369
Authority: WO
Inventors: 倪祖根
Original assignee: 莱克电气股份有限公司
Priority date: 2017-03-21
Filing date: 2017-07-10
Publication date: 2018-09-27
Also published as: CN106930962B; CN106930962A

Abstract

A fan blade structure and a fan using same. The fan blade structure comprises a hub (1) and a plurality of blades (2) annularly and evenly distributed at the peripheral surface of the hub (1). Each blade (2) comprises a hub connecting portion (21) connected to the hub (1), a sickle-shaped front edge (24), an S-shaped rear edge (22), and a top blade edge (23) located at the tail end of the outer side of the blade (2) to connect the front edge (24) and the rear edge (22). A blade tip (25) is provided between the top blade edge (23) and the front edge (24), and the blade tip (25) is arc-shaped. An angle between the tangent lines L5 and L4 at the two ends of the blade tip (25) respectively connected with the top blade edge (23) and the front edge (24) is a2, wherein a2 is in the range of 40°-50°. The fan blade structure and the fan using same can not only ensure the air volume and air speed but also produce less noise.

Description

Fan blade structure and fan using the same

Technical field

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

Background technique

A fan is a device that uses a wind-cooled appliance to heat the air. It is a device that generates airflow by electric driving. The fan blades are internally rotated to generate air flow to take away the heat of the human body to achieve the effect of cooling. In the existing fan, when the fan blade rotates, the distance of the air flow can be increased only by increasing the rotation speed of the blade. Thus, the conventional blade will generate a large wind resistance, and at the same time generate a large wind noise, and generate The airflow is very uncomfortable in the human body; in addition, the traditional fan blades can generate a very limited airflow distance, resulting in a decline in the experience of the fan product.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a fan blade structure and a fan using the same, which can ensure a small amount of noise while suppressing air volume and wind speed.

To this end, the present invention employs the following technical solutions:

In one aspect, the present invention provides a blade structure including a hub and a plurality of blades annularly distributed on an outer circumferential surface of the hub, each of the blades including a hub connection portion connected to the hub, a sickle-shaped front An edge, an S-shaped rear edge, and an end located outside the blade to connect the leading edge and the trailing edge of the blade top edge, the blade top edge a blade tip is disposed between the front edges, and the blade tip has an arc shape; the angle between the blade tip connecting the blade top edge and the tangent lines L5 and L4 at the two ends of the front edge respectively is A2, wherein a2 ranges from 40° to 50°.

As a preference, the a2 is 45°.

Preferably, the rear edge includes 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, the rear edge The front section connects the blade top edge, wherein a bending direction of the rear edge end section is opposite to a bending direction of the rear edge front section, and a bending direction of the rear edge front section is toward the front edge.

Preferably, the bending radius of the trailing edge end section is smaller than the bending radius 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, the line between the center O point of the hub and the midpoint A of the hub connection of the blade is set to L1, the center O point of the hub and the tip of the hub The line between the arc centers B is set to L2, and the angle between L1 and L2 is a1, wherein a1 ranges from 25° to 30°.

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

As a preference, the a1 is 27° and the a3 is 25°.

As a preference, the hub is cylindrical.

As a preference, the number of the blades is seven.

In another aspect, the invention also provides a fan comprising the blade structure.

The beneficial effects of the invention are:

The blade structure of the present invention and the fan using the blade structure are provided by spirally connecting the hub connecting portion of each blade, the rear edge is set to an S shape, and the front edge is provided in a sickle shape at the front edge and the blade top edge A tip is disposed between the tip of the blade and the tangent L5, L4 at the ends of the leading edge and the front edge respectively, wherein the range of a2 ranges from 40° to 50°, and the leaf is utilized. The tip can break through the air barrier formed by the air, effectively reducing the wind resistance of the blade and reducing the noise.

DRAWINGS

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

2 is a front perspective view of a fan blade structure according to a first embodiment of the present invention;

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

Figure 4 is a side view showing the structure of the blade structure of Figure 1 in the A direction;

Figure 5 is a front view showing the structure of the blade structure of Figure 1;

Fig. 6 is a schematic diagram showing the parameter expression of the labeling parameters of the blade structure of Fig. 5.

In the figure: 1-wheel; 2-blade;

21-hub connection; 22-rear edge; 23-blade top edge; 24-front edge; 25-tip; 26-positive pressure surface; 27-negative pressure surface;

221 - the end of the trailing edge; 222 - the middle section of the trailing edge; 223 - the front section of the trailing edge.

detailed description

The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

It should be noted that, in the present invention, the terms "center", "front", "back", "top", "bottom", etc. are oriented or positional relationship based on the orientation or positional relationship shown in the drawings, only The present invention and the simplifications of the invention are not to be construed as limiting or limiting the scope of the invention.

As shown in FIGS. 1 to 6, a blade structure includes: a hub 1 and a plurality of blades 2 annularly distributed on an outer circumferential surface of the hub 1, wherein the hub 1 is for connecting with a rotating shaft of the motor, thereby The motor drives the blade structure to rotate, and when rotating, the blade 2 guides the air and generates an air flow; and the three-dimensional shape of the blade 2 is an important factor determining the air flow characteristic in the fan, for example, the three-dimensional shape of the blade 2 can be caused by the swing angle, Factors such as the ratio of the inner and outer diameter, the bevel angle, the maximum bending amount, and the maximum bending position are specifically expressed. These constituent factors defining the shape of the blade 2 by the three-dimensional concept are frequently used in the aerodynamic field.

In the present embodiment, since the shape of the blade 2 is related to the flow of the fluid, specifically, the airflow formed by the blade 2 passes through the rear side of the blade 2, and moves toward the front side of the blade 2, where the fluid is to be bladed 2 A surface before suction is defined as a negative pressure surface 27, and the other surface of the blade which is not visible on the reverse side is defined as a positive pressure surface 26, that is, the front surface of the blade 2 is a positive pressure surface 26, and the back surface is a negative pressure surface 27; further Ground, when the blade 2 rotates, the portion of the air flowing into the blade 2 that comes into contact with the blade 2 is defined as the front edge 24, air. The portion that is detached from the blade is the rear edge 22; further, the portion of the blade 2 that is coupled to the hub 1 is defined as the hub connection portion 21; the end of the blade 2 along the radial direction, that is, the portion connecting the front edge 24 and the rear edge 22 of the blade Defined as the blade top edge 23.

The blade structure as described above is rotated by the motor drive, and due to the pressure difference formed by the negative pressure surface 27 of the blade 2 and the positive pressure surface 26, the fluid flows from the top to the bottom, that is, due to the non-stop rotation of the blade structure. The air on the rear side of the fan blade structure flows toward the front side.

As shown in FIG. 1 to FIG. 6 , an embodiment of the present invention provides a blade structure, each blade 2 including a spiral hub connecting portion 21 connected to the hub 2, a sickle-shaped front edge 24, and an S shape. The trailing edge 22 and the end located outside the blade 2 are joined to the blade leading edge 23 of the leading edge 24 and the trailing edge 22. The hub connecting portion 21 is deflected at an angle of 40 to 50 with respect to the rotational axis of the hub 1, and the angle preferred in the present invention is 45. A blade tip 25 is provided between the blade top edge 23 and the front edge 24, and the blade tip 25 has an arc shape. The distance between the midpoint of the arc of the blade tip 25 and the center O of the hub 1 is Ra, centered on the center O of the hub 1, and the circle having the radius Ra is the reference circle, and the radius Ra of the reference circle is the fan. The reference radius of the blade of the blade structure, which is the reference circle.

In the present embodiment, the hub 1 is cylindrical, and the number of the blades 2 provided on the outer circumference of the hub 1 is preferably singular, and is set to seven in the present invention.

In particular, in the present embodiment, the tip 25 is connected to the angle between the tangent lines L5 and L4 at the both ends of the blade top edge 23 and the front edge 24, respectively, wherein the range of a2 ranges from 40° to 50°. . For example, a2 may be 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, as a preferred, a2 is 45°, the angle The blade tip 25 can effectively reduce the wind resistance of the blade during operation, which is beneficial to reduce noise.

As shown in FIGS. 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. The 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 is toward the front edge 24, so that the position can be increased. The fan's air output increases the airflow rate when the blade rotates. As a preference, 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 arc length of the trailing edge end section 221 is smaller than the arc length of the trailing edge front section 223.

Preferably, the line between the center O point of the hub 1 and the midpoint A of the hub connecting portion 21 of the blade 2 is set to L1, and the center O point of the hub 1 and the arc center B of the blade tip 25 are used. The line between them is set to L2, and the 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 further preferably, a1 is 27°, within the above range, a different number may be set in the circumference of the hub as required. The blade 2 optimizes the dynamic balance when the blade rotates, reducing the noise of the blade when rotating at a high speed.

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

Further, the intersection of the intermediate reference circle and the trailing edge 22 of the blade 2 to the perpendicular of L1 The length of the segment is set to L6, and the over-air 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 the L6.

In addition, the present invention provides a fan including the above-described blade structure.

In the fan blade structure of the fan of the present invention, the above-described blade structure is rotated clockwise when viewed from the positive pressure surface. When it is rotated, it can achieve low noise by the sickle shape of the front edge, the S shape of the rear edge, and the cooperation of the tip.

The technical principles of the present invention have been described above in connection with specific embodiments. The descriptions are merely illustrative of the principles of the invention and are not to be construed as limiting the scope of the invention. Based on the explanation herein, those skilled in the art can devise various other embodiments of the present invention without departing from the scope of the invention.

Claims

A blade structure comprising a hub (1) and a plurality of blades (2) annularly distributed on an outer circumferential surface of the hub (1), wherein each of the blades (2) comprises a connection to the a hub connection portion (21) of the hub (2), a sickle-shaped front edge (24), an S-shaped rear edge (22), and an end located outside the blade (2) to connect the front edge (24) with a blade top edge (23) of the rear edge (22), a blade tip (25) is disposed between the blade top edge (23) and the front edge (24), and the blade tip (25) is round An arc shape; the angle between the blade tip (25) connecting the blade top edge (23) and the tangent lines L5, L4 at the two ends of the front edge (24) is respectively a2, wherein the range of a2 It is 40° to 50°.
The blade structure according to claim 1, wherein said a2 is 45°.
The blade structure according to claim 1, characterized in that the rear edge (22) comprises a rear edge end section (221) connected to the hub (1), connected to the rear edge end section (221) a rear edge middle section (222) and a rear edge front section (223) connected to the rear edge middle section (222), the rear edge front section (223) connecting the blade top edge (23), wherein

The bending direction of the trailing edge end section (221) is opposite to the bending direction of the trailing edge front section (223), and the bending direction of the trailing edge front section (223) is toward the front edge (24).
The blade structure according to claim 3, wherein said rear edge The bending radius of the 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).
Blade structure according to claim 1, characterized in that the connection between the center O point of the hub (1) and the midpoint A of the hub connection (21) of the blade (2) The line is set to L1, and the line between the center O point of the hub (1) and the arc center B of the blade tip (25) is set to L2, and the angle between L1 and L2 is a1, wherein , a1 ranges from 25° to 30°.
A blade structure according to claim 5, characterized in that the center O point of the hub (1) is centered at the center O of the hub (1) to the tip (25) The half of the distance between the centers of the arcs is defined as the intermediate reference circle, and the intersection of the intermediate reference circle and L1 is set to C point, and the tangent of the intermediate reference circle at point C is set to L3, between L3 and L4. The angle is a3, wherein a3 ranges from 22° to 28°.
The blade structure according to claim 6, wherein said a1 is 27° and said a3 is 25°.
The blade structure according to any one of claims 1 to 7, characterized in that the hub (1) is cylindrical.
The blade structure according to any one of claims 1 to 7, characterized in that the number of the blades (2) is seven.
A fan comprising the blade structure of any of claims 1-9.