TWI721774B - Fan blade - Google Patents

Abstract

Disclosed is a fan blade with characteristics of both multi-blade and few-blade, comprising a hub and a plurality of blades, wherein at least one of the blades is formed with at least one elongated slit such that the blade is divided into two or more sub-blade portions by the at least one elongated slit.

Description

Fan blades

The present invention relates to a fan blade, and particularly relates to a fan blade with the characteristics of multiple blades and few blades.

A fan is a mechanical device that can create or accelerate air flow by driving the rotation of fan blades. Fans are widely used. Common ones are: household electric fans for cooling and relieving heat, and cooling fans that help electronic components (for example, CPU) in electronic devices dissipate heat.

Generally speaking, a fan includes two main parts: a fan blade for driving airflow and a drive motor for driving the rotation of the fan blade. The structure of the fan blade (for example, the number of blades) will affect the effect and performance of the fan. Bring great impact.

The number of blades of fan blades varies in design according to the characteristics of the demand. The number of blades may be three to five, and the number of blades may be as many as ten to twenty. If the number of blades is small, the area of a single blade is usually larger, and the range of interaction with the air is larger, the wind pressure generated will be larger, but the running noise will be relatively larger. If the number of blades is large, the blade vibration during operation is small and the running noise is small, and the generated wind pressure is small and soft. However, the overall structure is relatively fragile due to the small volume of a single blade, so it is often difficult to bear the burden at high speeds. Operation.

Therefore, the object of the present invention is to provide a fan blade that can have both the characteristics of multiple blades and fewer blades, so as to solve the problems of the conventional technology.

The technical means adopted by the present invention to solve the problems of the prior art is to provide a fan blade, comprising: a hub; and a plurality of blades connected around the hub, each blade having an inner edge and an outer edge opposite to each other, and It has two side edges, the inner edge of the blade is connected to the hub, one of the side edges of the blade is connected between one end of the inner edge of the blade and one end of the outer edge of the blade, and the other side edge of the blade Connected between the other end of the inner edge of the blade and the other end of the outer edge of the blade, At least one elongated slit is formed in at least one of the blades, and the elongated slit extends in a direction from the inner edge of the blade to the outer edge of the blade, and the elongated slit does not extend to the outer edge of the blade. The outer edge of the blade, and the blade is divided into two or more sub-blade parts by the elongated slit, and the outer edges of the two adjacent sub-blade parts are not separated by the elongated slit and kept Connected.

In an embodiment of the present invention, a fan blade is provided, wherein the elongated slit is formed by extending in a curved arc shape.

In an embodiment of the present invention, a fan blade is provided, wherein the arc direction of the elongated slit is the same as the arc direction of the side edge of the blade.

In an embodiment of the present invention, a fan blade is provided, wherein one end of the elongated slit extends to the inner edge of the blade, and the inner edges of two adjacent sub-blade portions are slit by the elongated slit. Separated by.

In one embodiment of the present invention, a fan blade is provided, wherein two adjacent side edges of two adjacent sub-blade portions are located on different surfaces in space.

In an embodiment of the present invention, a fan blade is provided, wherein the inner edges of the sub-blade portions on the same blade have the same length.

In an embodiment of the present invention, a fan blade is provided, wherein the fan blade is a DC motor fan blade applied to a DC motor fan.

Through the technical means adopted by the present invention, the fan blade of the present invention has a small number of blades and a large number of sub-blade portions, and can have both multi-blade and small-blade characteristics. In the fan blade of the present invention, a small number of blades can provide higher structural strength, so that the fan blade can bear the operation at a high speed, and a large number of sub-blade parts can effectively suppress operating noise, and the blade The structure of the long slit on the upper part can easily generate turbulence and increase the wind flow to a certain extent. Therefore, the fan blade of the present invention is particularly suitable for DC motor fans, while providing the effects of high rotation speed, low noise, and large air flow.

Hereinafter, the embodiments of the present invention will be described based on Figs. 1 to 6. This description is not intended to limit the implementation of the present invention, but is a kind of embodiment of the present invention.

As shown in Figures 1 to 3, a fan blade 100 according to an embodiment of the present invention includes: a hub 1; and a plurality of blades 2 connected around the hub 1, each of the blades 2 having opposite An inner edge 201 and an outer edge 202 are provided with two side edges 203 and 204. The inner edge 201 of the blade 2 is connected to the hub 1, and one of the side edges 203 of the blade 2 is connected to the inner edge 201 of the blade 2 Between one end and one end of the outer edge 202 of the blade 2, the other side edge 204 of the blade 2 is connected between the other end of the inner edge 201 of the blade 2 and the other end of the outer edge 202 of the blade 2, Wherein at least one of the blades 2 is formed with at least one elongated slit 3, and the elongated slit 3 extends in a direction from the inner edge 201 of the blade 2 to the outer edge 202 of the blade 2, and the elongated slit 3 The slit 3 does not extend to the outer edge 202 of the blade 2, but the elongated slit 3 divides the blade 2 into two or more sub-blade parts 21, 22, and two adjacent sub-blade parts The outer edges of 21 and 22 are not separated by the elongated slit 3 and remain connected.

Specifically, as shown in FIG. 2, in this embodiment, the fan blade 100 has a total of five blades 2. Of course, the present invention is not limited to this. The number of blades 2 can be any number. However, in order to enable the fan blade 100 to fully utilize the characteristics of the smaller number of blades, the number of blades 2 should not be too large, so it is usually three to seven. The film is better.

This fan blade 100 can blow air forward (a direction away from the drawing surface) by rotating clockwise. In each of the blades 2, according to the rotation direction of the fan blade 100 when blowing air, the side edge 203 is the leading edge of the fan blade 100 or called the wind cutting edge (that is, the side edge used to generate the wind cutting). The side edge 204 is the rear edge of the fan blade 100. When the fan blade 100 rotates clockwise, the airflow flows into the blade surface area of the blade 2 from the wind cutting edge (side edge 203), and is pushed by the blade surface of the blade 2 to flow forward, thereby allowing it to move forward. The wind is generated, and the heat in the back can also be taken away by the airflow.

As shown in Figs. 1 and 2, according to the fan blade 100 of an embodiment of the present invention, the elongated slit 3 is formed by extending in a curved arc shape. Specifically, the extension shape of the elongated slit 3 is not particularly limited. The elongated slit 3 may extend in a straight line or in a curved arc shape. In addition, it may also extend in an arbitrary curve shape. . Each of the elongated slits 3 mainly has two edges 303, 304, one of the edges 304 of the elongated slit 3 is used as the leading edge of one of the sub-blade portions 22 (ie, the wind cutting edge), and the other One edge 303 serves as the trailing edge of the other sub-blade part 21. Therefore, in order to make one of the edges 304, which is the wind cutting edge of one of the sub-blade portions 22, have a good wind cutting effect, the arc direction of the elongated slit 3 is in line with the side edges 203, 204 of the blade 2. The curved arcs have the same direction, that is, in this embodiment, the curved arcs of the elongated slit 3 and the side edges 203 and 204 of the blade 2 are both curved in a clockwise direction. In addition, if the curved directions of the side edges 203 and 204 of the blade 2 are different, the curved direction of the elongated slit 3 is the same as the curved direction of the side edge 203 of the blade 2 as the wind cutting edge. The same is better.

As shown in Figures 1 and 2, according to an embodiment of the fan blade 100 of the present invention, one end of the elongated slit 3 extends to the inner edge 201 of the blade 2, and two adjacent sub-blades The inner edges of the parts 21 and 22 are separated by the elongated slit 3. Specifically, the extension length of the elongated slit 3 is not particularly limited, as long as it does not extend to the outer edge 202 of the blade 2 (that is, the outer edges of the two adjacent sub-blade portions 21 and 22 are not affected by the outer edges. The long slits 3 are separated and kept connected). Since one of the edges 304 of the elongated slit 3 serves as the wind cutting edge of one of the sub-blade portions 22, the length of the wind cutting edge will affect the flow of the wind cutting edge (edge 304) into the sub-blade portion 22 The amount of airflow affects the wind flow. Therefore, in order to obtain a good wind cutting effect, the longer the length of the edge 304 as the wind cutting edge, the better. Therefore, in this embodiment, one end of the elongated slit 3 extends to the inner edge 201 of the blade 2 to obtain a larger length of the wind cutting edge (the edge 304). As for the other end of the elongated slit 3, although it can also extend very close to the outer edge 202 of the blade 2 to obtain a greater length of the wind cutting edge, as the other end of the elongated slit 3 is closer to the blade 2 Outer edge 202, the shorter the length of the sub-blade portion 21 and the sub-blade portion 22 connected, on the contrary, the structure becomes fragile and easy to vibrate and break. Therefore, the other end of the elongated slit 3 and the outer edge 202 of the blade 2 should not be too close to each other, and it is better to retain a proper connection length to maintain a certain structural strength of the blade 2.

As shown in Figures 1 to 3, according to an embodiment of the fan blade 100 of the present invention, two adjacent side edges of the two adjacent sub-blade portions 21, 22 (that is, as the sub-blade portion The edge 304 of the front edge of 22 and the edge 303 of the rear edge of the sub-blade portion 21) are located on different surfaces in space. Specifically, the front edge (the edge 304) of the sub-blade portion 22 is spaced apart from the rear edge (the edge 303) of the sub-blade portion 21, so that the leaf surface of the sub-blade portion 22 and the sub-blade portion The leaf surfaces of 21 are located on different surfaces (planes, curved surfaces) in space. With this structure, the front edge (the edge 304) of the sub-blade portion 22 can perform the wind cutting function more independently, instead of mostly just assisting the side edge 203 (wind cutting edge) of the blade 2, thereby making The sub-blade portion 21 and the sub-blade portion 22 are not only two parts of a single blade, but can also function as separate blades, so that the multi-blade characteristics of the fan blade 100 are more obvious. Of course, the present invention is not limited to this. Based on other considerations, two adjacent side edges of the two adjacent sub-blade portions 21 and 22 may also be located on the same surface in space.

As shown in FIG. 2, in the fan blade 100 according to an embodiment of the present invention, the inner edges of the sub-blade portions 21 and 22 on the same blade 2 are equal in length. Specifically, since the inner edge lengths of the sub-blade portions 21, 22 are equal, that is, the connection lengths between the sub-blade portions 21, 22 and the hub 1 are equal, so that the sub-blade portions 21, 22 can be made equal to each other. The connection structure strength between 22 and the hub 1 is similar or equal to each other. In this way, it can be ensured that each sub-blade portion of the overall fan blade 100 has a similar endurance capability, so as to have a similar life span under the same operating conditions, thereby reducing the premature appearance of a small number of sub-blade portions. Vibration or breakage may cause the entire fan blade 100 to be repaired or replaced. Of course, the present invention is not limited to this. As the shape of each blade 2 or each of the sub-blade portions 21, 22 is different, it is also possible to obtain similar or equal inner edge lengths by different inner edge lengths. Structural strength. Or, based on other considerations, the fan blade 100 may also be set such that the inner edge lengths of the sub-blade portions 21 and 22 are not equal to each other.

According to the fan blade 100 of an embodiment of the present invention, the fan blade 100 is a DC motor fan blade applied to a DC motor fan. Specifically, since the fan blade 100 of the present invention can provide the effects of high rotation speed, low noise, and large air flow at the same time, it is particularly suitable as a cooling fan that has high requirements for quietness and heat dissipation at the same time, and this type of cooling fan is usually They are all DC motor fans driven by DC power. Of course, the present invention is not limited to this. As an AC fan, the fan blade 100 of the present invention can also exert the same effect.

4 to 6 are schematic diagrams showing a fan blade 100a according to another embodiment of the present invention. The structure of the fan blade 100a of this embodiment is substantially the same as that of the fan blade 100 of the previous embodiment, so the corresponding components are marked with the same component symbols. The difference between the fan blade 100a of this embodiment and the fan blade 100 of the previous embodiment is that the fan blade 100a of this embodiment has two elongated slits 3 formed on one blade 2 and divides one blade 2 into three. Each of the sub-blade parts 21, 22, 23. Of course, the present invention is not limited to this. In the same blade 2, the number of the elongated slits 3 can be any number. Furthermore, the number of the elongated slits 3 in different blades 2 may also be different from each other. For example, one blade has one long slit 3, and the other blade has two long slits 3. Another example: one of the blades has a plurality of elongated slits 3, and the other blade does not have the elongated slits 3. In addition, the extension shape, extension length, or edge position of the elongated slit 3 in the same blade 2 can also be the same or different from each other, and there is no particular limitation.

With the above structure, the fan blade 100 of the present invention has a small number of blades 2 and a large number of sub-blade portions 21, 22, 23, and can have both multi-blade and small-blade characteristics. In the fan blade 100 of the present invention, a small number of blades 2 can provide higher structural strength, so that the fan blade 100 can afford to operate at a high speed, and a large number of sub-blade parts 21, 22, 23 can be effective The operation noise is suppressed, and the long slit 3 on the blade 2 can easily generate turbulence and increase the wind flow to a certain extent. Therefore, the fan blade 100 of the present invention is particularly suitable for use in a DC motor fan, while providing the effects of high rotation speed, low noise, and large air flow.

The above descriptions and descriptions are only descriptions of the preferred embodiments of the present invention. Those with general knowledge of this technology should make other modifications based on the scope of patent applications defined below and the above descriptions, but these modifications should still be made. It is the spirit of the present invention and falls within the scope of the rights of the present invention.

100: fan blades 100a: fan blade 1: Wheel hub 2: blade 201: Inner Edge 202: Outer Edge 203: Side Edge 204: Side Edge 21: Sub-leaf 22: Sub-leaf 23: sub-leaf part 3: Long slit 303: Edge 304: Edge

[Figure 1] is a perspective view showing a fan blade according to an embodiment of the present invention; [Figure 2] is a schematic front view showing a fan blade according to an embodiment of the present invention; [Figure 3] is a schematic side view showing a fan blade according to an embodiment of the present invention; [Figure 4] is a perspective view showing a fan blade according to another embodiment of the present invention; [Figure 5] is a schematic front view showing a fan blade according to an embodiment of the present invention; [Figure 6] is a schematic side view showing a fan blade according to an embodiment of the present invention.

100: fan blades

1: Wheel hub

2: blade

201: Inner Edge

202: Outer Edge

203: Side Edge

204: Side Edge

21: Sub-leaf

22: Sub-leaf

3: Long slit

303: Edge

304: Edge

Claims (7)

A fan blade includes: a hub; and a plurality of blades connected around the hub, each blade has an inner edge and an outer edge opposite to each other, and has two side edges, and the inner edge of the blade is connected to the hub, One side edge of the blade is connected between one end of the inner edge of the blade and one end of the outer edge of the blade, and the other side edge of the blade is connected between the other end of the inner edge of the blade and the outer edge of the blade Between the other ends, wherein at least one elongated slit is formed in the range of the blade surface of at least one of the blades, and the elongated slit extends in a direction from the inner edge of the blade to the outer edge of the blade, And the elongated slit system does not extend to the outer edge of the blade, but the blade is divided into two or more sub-blade portions by the elongated slit, and the outer edges of the two adjacent sub-blade portions are It is not separated by the long slit and remains connected. The fan blade according to claim 1, wherein the elongated slit is formed by extending in a curved arc shape. The fan blade according to claim 2, wherein the direction of the arc of the elongated slit is the same as the direction of the arc of the side edge of the blade. The fan blade according to claim 1, wherein one end of the elongated slit extends to the inner edge of the blade, and the inner edges of two adjacent sub-blade portions are separated by the elongated slit. The fan blade according to claim 1, wherein two adjacent side edges of the two adjacent sub-blade portions are located on different surfaces in space. The fan blade according to claim 1, wherein the inner edges of the sub-blade portions on the same blade have the same length. The fan blade according to claim 1, wherein the fan blade is a DC motor fan blade applied to a DC motor fan.

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