TW201816281A - Cooler fan having double blades - Google Patents

Abstract

According to an exemplary embodiment of the present invention, it is possible to enhance the cooling efficiency by forming two or more air flows and increasing a wind amount and a wind speed through different double blades which are radially formed in the hub. To this end, an exemplary embodiment of the present invention provides a cooler fan having double blades including: a cylindrical hub connected to a driving shaft of a driving motor; a plurality of inner blades which is radially arranged and connected to an outer peripheral surface of the hub; and a plurality of outer blades which is disposed and connected to radial ends of the plurality of inner blades, in which an angle A1 between each inner blade and a rotation surface is larger than an angle A2 between each outer blade and the rotation surface.

Description

 Cooling fan with double blades  

The present invention relates to a cooling fan for an electronic device, and more particularly to a cooling fan or impeller formed with a double blade.

The cooling fan is composed of a hub and a plurality of rotating blades which are arranged in a radial direction and are connected to an outer periphery of one of the hubs to generate a flow of air upon rotation, that is, to generate wind. An electric motor is disposed in the hub, and the electric motor is fixed to the frame.

The cooling fan is mounted on an electronic device such as a computer and is used to cool the heat of various embedded heat generating components by strongly flowing the surrounding air.

The rotary vane provided in the conventional cooling fan extends in a radial direction at a portion connected to the hub, and has a gradually increasing or constant width. In the conventional cooling fan, in the case where a large amount of heat is to be cooled, a cooling fan including a large rotating blade is used, or the rotational speed of the rotating blade is increased to form a strong wind.

However, since the space for mounting the cooling fan is generally limited, there is a problem that the increase in the length and width of the rotating blade is limited. In addition, when the rotation speed is increased, there is a problem that the noise is greatly increased and the amount of power consumed is also increased. High-speed rotation also has the disadvantage of shortening the life of the cooling fan.

Further, in the case of the conventional cooling fan, there is a problem in that the air flow near the center of the hub is small due to the limitation of the shape of the rotating blade whose width gradually increases away from the hub.

In some prior art, in order to solve such problems, after securing the space at the center of the rotating blade, a configuration in which a plurality of individual small rotating blades are further disposed in the secured space is attempted, but such a conventional technique has A problem that complicates the construction and has insufficient effects.

In order to solve the above problems, an object of the present invention is to provide a cooling fan having a double blade capable of enhancing cooling efficiency by forming a double air flow with different double blades formed in a hub in the radial direction and increasing air volume and wind speed .

The object of the present invention can be attained by providing a cooling fan having a double blade, the cooling fan comprising: a cylindrical hub coupled to a drive shaft of a drive motor; a plurality of inner blades Arranging in a radial direction and connected to an outer peripheral surface of the hub; and a plurality of outer blades disposed and connected to the radial ends of the inner blades, wherein each of the inner blades and a rotating surface The angle A1 is greater than the angle A2 between each of the outer blades and the rotating surface.

At a connection portion of each of the outer blades and each of the inner blades, the front ends of the inner blades in the rotational direction may be formed to be higher in the direction of the rotation axis of the hub than the outer blades in the rotation direction. Front end.

At the connecting portion where each of the outer blades is connected to each of the inner blades, the front ends of the inner blades in the rotational direction may be formed to be more in the rotational direction of the hub than the outer ends of the outer blades in the rotational direction. protruding.

Each of the inner blades may have a radial length that is less than a radial length from a radial end of each of the inner blades to an outermost side of each of the outer blades.

In addition, the angle A1 between each of the inner blades and the rotating surface may be greater than or equal to 20 degrees and less than or equal to 50 degrees.

Meanwhile, a connecting portion connecting each of the inner blades and each of the outer blades may be formed such that each of the inner blades and each of the outer blades overlap each other, and the connecting portion may further have each inner blade and each outer portion A flow block is formed between the blades.

According to this exemplary embodiment of the present invention, the cooling efficiency can be enhanced by forming two or more air flows with different double blades formed in the hub in the radial direction and increasing the air volume and the wind speed.

1, 3‧‧‧ cooling fan

10‧‧‧ hub

11‧‧‧ outer peripheral surface

12‧‧‧ upper surface

20, 22‧‧‧ inner blades

30, 32‧‧‧ outer blades

A1, A2‧‧‧ angle

B1, B2‧‧‧ Connections

C‧‧‧Rotary axis

L1, L2‧‧‧ radial length

1 is a perspective view of a cooling fan having a double blade according to an exemplary embodiment of the present invention; and FIG. 2 is a perspective view of the cooling fan shown in FIG. 1 viewed from a lower portion; FIG. 3 is a first view; The front view of the cooling fan is shown in the figure; Fig. 4 is a plan view of the cooling fan viewed from the upper portion shown in Fig. 1; and Fig. 5 is a perspective view of the cooling fan with double blades according to a variant of the present invention. .

In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings and the accompanying drawings, but the invention is not limited to the exemplary embodiments. Aspect.

Various changes may be applied to the illustrative embodiments described below. The illustrative embodiments described below are not intended to be limited to the various aspects, but are to be construed as including all variations, equivalents, and alternatives.

The terms used in the illustrative embodiments are merely illustrative of specific exemplary embodiments and are not intended to limit the illustrative embodiments. A singular expression as used herein includes a plural expression unless it has the contrary meaning in the context. In the present specification, it should be understood that the terms "include" or "have" indicate that there are features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification. The possibility of the presence or addition of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof is not excluded.

However, in the following description of the present invention, when it is determined that the detailed description of related functions or configurations may unnecessarily obscure the gist of the present invention, it will not be described in detail. In addition, the terms used in the present specification are terms for appropriately expressing the exemplary embodiments of the present invention, and may vary depending on the intention of the user or the operator, the practice in the field to which the present invention pertains, and the like. Therefore, the definition of each term should be made in accordance with the contents of this manual.

Further, in the following description with reference to the accompanying drawings, like structural elements are denoted by like reference numerals, regardless of the reference number, and will not be described again. In describing the exemplary embodiments, if it is determined that the detailed description of the related art may unnecessarily obscure the subject matter of the exemplary embodiments, it will not be described in detail.

Cooling fan with double blades

1 is a perspective view of a cooling fan having a double blade according to an exemplary embodiment of the present invention. As illustrated in FIG. 1, the dual-blade cooling fan 1 of the present invention includes a hub 10, a plurality of inner blades 20, and a plurality of outer blades 30 that are coupled to respective inner blades 20. In the cooling fan 1 of this exemplary embodiment, since the drive shaft and a drive motor are coupled to the hub 10 and a frame is formed on the outer side as in the related art, the detailed description will be omitted, and only the exemplary description will be explained in detail. The cooling fan 1 of the embodiment is implemented.

The hub 10 can have a cylindrical shape including an upper surface 12 and an outer peripheral surface 11. As illustrated in Fig. 2, the lower surface of the hub 10 has a hollow space for receiving the drive shaft (or shaft) and the drive motor. The center of the hub 10 is on the same axis as the rotational axis C that rotates in the counterclockwise direction. The inner blade 20 to be described later is formed on the outer peripheral surface 11, and the outer blade 30 is formed at the radial end of the inner blade 20.

As illustrated in FIGS. 1 to 4, in the cooling fan 1, the plurality of inner blades 20 are formed at an equal angle along the outer peripheral surface 11 of the hub 10, and the outer blades 30 are located at the inner blades 20. The radial ends are connected to each other in the radial direction with the inner blades 20. The outer blades 30 are formed in a number corresponding to the inner blades 20.

Specifically, as illustrated in the front view of FIG. 3, the angle A1 between the inner blade 30 and the rotating surface is larger than the angle A2 between the outer blade 30 and the rotating surface. The inner blade 20 selectively forms an angle A1 with the rotating surface in the range of 20 to 50 to increase the flow of air to the center of the hub 10. Further, the outer blade 30 forms an included angle A2 of greater than or equal to 10° and less than or equal to 45° with the rotating surface, and an angle A2 formed with the rotating surface is smaller than an angle formed by the inner blade 20 and the rotating surface.

Herein, the rotating surface may be defined as a plane perpendicular to the axis of rotation C and a plane in which the rotating orbit is formed, and the angles A1 and A2 formed with the rotating surface may be defined as each of the blades at a joint B1 The angle between the tangential line and the rotating surface, the inner blade 20 and the outer blade 30 are connected to each other in the connecting portion B1.

At the joint portion B1, the inner blade 20 is formed to be higher than the outer end of the outer blade 30 in the rotational direction in the direction of the rotation axis of the hub 10. Further, at the joint portion B1, the inner blade 20 is formed to protrude more in the rotational direction of the hub 10 than the outer end of the outer blade 30 in the rotational direction. The inner blade 20 can further actuate the air flow at the center of the hub 10 by pushing air earlier than the outer blade 30. Herein, in the exemplary embodiment, the connecting portion B1 is a portion in which the end portions of the inner blade 20 and the end portions of the outer blade 30 face each other and are connected to each other by the thickness of each of the blades.

The radial length L1 of the inner blade 20 may be formed to be smaller than the radial length L2 from the radial end of the inner blade 20 to the outermost side of the outer blade 30. The dual blades of the present invention can differently form a plurality of air flow states formed by the outer blades 30 and a small amount of air flow conditions formed by the inner blades 20.

Meanwhile, as illustrated in the plan view of FIG. 4, the area in which the outer blade 30 is vertically projected to the rotating surface is formed to be larger than the area in which the inner blade 20 projects to the rotating surface. However, the projected area of the outer blade 30 may be limited to 1.5 times or more and less than or equal to 2 times the projected area of the inner blade 20, thereby coherently forming an air flow state formed by each of the inner blade 20 and the outer blade 30.

Fig. 5 is a perspective view of a cooling fan having a double blade according to a variation of the present invention. A modified example of the cooling fan 3 having a double blade is similar to the foregoing exemplary embodiment in that, as illustrated in FIG. 5, the cooling fan 3 includes a hub 10, a plurality of inner blades 22, and a plurality of outer blades 32. In particular, since the hub 10 is identical to the hub of the foregoing exemplary embodiment, it will not be described.

In the modified example of the foregoing exemplary embodiment, the inner blade 22 and the outer blade 32 overlap each other at a joint portion B2. That is, at the joint portion B2, the ends of the inner blades 22 and the ends of the outer blades 32 are connected to each other by a predetermined length. In addition, the connecting portion B2 may further have a flow resistance block formed between the inner blade 22 and the outer blade 32. Such a flow block fills the gap formed by connecting the inner blade 22 and the outer blade 32 diagonally to prevent air from traveling along the gap.

Further, in the description of the inner blade 22 and the outer blade 32, since the angle formed with the rotating surface, the radial length, and the area projected onto the rotating surface are repeated with the foregoing exemplary embodiment, it will no longer be Explain it.

Although the exemplary embodiments of the present invention have been described above with reference to the drawings, it should be understood that those skilled in the art can implement the invention in other detailed embodiments without changing the technical spirit or essential features of the present invention. Technical configuration. Therefore, the above-described exemplary embodiments are to be considered in all respects as illustrative and not limiting. Further, the scope of the invention is to be construed in the claims In addition, all changes and modifications that come within the scope and scope of the invention are intended to be included in the scope of the invention.

Claims (6)

 A cooling fan with dual blades, comprising: a cylindrical hub connected to a drive shaft of a drive motor; a plurality of inner blades arranged radially and connected to one of the hubs a peripheral surface; and a plurality of outer blades disposed to and connected to the radial ends of the inner blades, wherein an angle A1 between each of the inner blades and a rotating surface is greater than between the outer blades and the rotating surface The angle A2.    A cooling fan having a double blade according to claim 1, wherein at a connection portion of each of the outer blades and each of the inner blades, a front end of each of the inner blades in the rotational direction is formed to rotate at the hub The direction of the shaft is higher than the front end of each of the outer blades in the direction of rotation.    A cooling fan having a double blade according to claim 1, wherein at a connection portion of each of the outer blades and each of the inner blades, a front end of each of the inner blades in the rotational direction is formed to rotate at the hub The direction is more prominent in the direction than the front end of each of the outer blades in the rotational direction.    A double-blade cooling fan according to claim 1, wherein each of the inner blades has a radial length smaller than a radial length from a radial end of each of the inner blades to an outermost side of each of the outer blades.    A cooling fan having a double blade according to claim 1, wherein the angle A1 between each of the inner blades and the rotating surface is greater than or equal to 20 degrees and less than or equal to 50 degrees.    A cooling fan having a double blade according to claim 1, wherein a connecting portion connecting each of the inner blades and each of the outer blades is formed such that each of the inner blades and each of the outer blades overlap each other, and the connecting portion Further, a flow block is formed between each of the inner blades and each of the outer blades.