KR20120071690A

KR20120071690A - Cooling fan for vehicle

Info

Publication number: KR20120071690A
Application number: KR1020100133329A
Authority: KR
Inventors: 곽효상
Original assignee: 주식회사 두원공조
Priority date: 2010-12-23
Filing date: 2010-12-23
Publication date: 2012-07-03

Abstract

PURPOSE: A cooling fan for a vehicle is provided to reduce noise while maintaining a blowing volume. CONSTITUTION: A cooling fan for a vehicle comprises a hub(100), a plurality of blades(200), and a circular ring(300). The hub is joined to a driving shaft. The blades are arranged along the circumferential direction of the hub by being spaced from the outer circumference of the hub at a constant interval. The circular ring connects end parts of the blades. Each leading edge of the blades forms a concave curve with respect to a setting point arranged between the hub and the circular ring and a portion between the hub and the setting point and a portion between the setting point and the circular ring respectively form concave curves with respect to a rotary direction. A trail edge forms a smooth convex curve with respect to an opposite direction of the rotary direction.

Description

Cooling fan for vehicle {Cooling fan for vehicle}

The present invention relates to a vehicle cooling fan, and more particularly to a vehicle cooling fan that can reduce noise.

Generally, a cooling fan for a vehicle is installed at a rear side of a heat exchanger such as a radiator and a condenser, and includes a hub that is coupled to a drive shaft of a fan motor and rotated, and a plurality of blades formed at predetermined intervals on an outer circumferential surface of the hub.

On the other hand, the cooling fan is the rotation noise is generated by the rotation of the blade, in order to reduce the rotation noise in the prior art is a structure formed so that the blades of the Korean Patent Publication No. 2002-0075660 alternately protrude in the longitudinal direction of the hub. Although the cooling fan of the is disclosed, there is a problem that the blade is not arranged to obtain a satisfactory noise reduction effect because of the configuration of two rows of arrays.

An object of the present invention is to provide a cooling fan for a vehicle capable of reducing noise while maintaining the airflow amount.

According to an aspect of the invention, the present invention is a hub coupled to the drive shaft, a plurality of blades spaced apart along the circumferential direction of the hub at a predetermined interval on the outer peripheral surface of the hub, and the ends of the blades In a cooling fan including a circular ring for connecting, leading edges (LE) of each of the blades, between the hub and the set point with respect to the set point located between the hub and the circular ring; Each of the set point and the circular ring forms a concave curve with respect to the rotation direction, and trailing edges TE of each of the blades form a smooth convex curve with respect to the direction opposite to the rotation direction. It provides a vehicle cooling fan.

According to another aspect of the invention, the present invention is a hub coupled to the drive shaft, a plurality of blades spaced apart along the circumferential direction of the hub at a predetermined interval on the outer peripheral surface of the hub, and the ends of the blades In the cooling fan comprising a circular ring for connecting, the leading wires of each of the blades, forming a smooth concave curve with respect to the rotation direction as a whole, and integrally provided with one projection projecting outwards on the leading wire, The trailing wires of each of the blades provide a cooling fan for the vehicle having a smooth convex curve with respect to the direction opposite to the rotation direction.

Therefore, the vehicle cooling fan according to the present invention can reduce noise while maintaining the airflow amount.

1 is a perspective view of the front of a vehicle cooling fan according to a first embodiment of the present invention.
FIG. 2 is a perspective view of the rear surface of the cooling fan of FIG. 1.
3 is a front view of the cooling fan of FIG. 1.
4 is a front view illustrating an arrangement distribution of the blades in the cooling fan of FIG. 1.
5 is a front view showing a detailed configuration of the blade in the cooling fan of FIG.
FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 3.
7 is a front view showing the detailed configuration of the blade of the cooling fan according to the second embodiment of the present invention.
8 is a graph illustrating OA noise characteristics of the cooling fan of FIG. 1.
9 is a graph showing the BPF noise characteristics of the cooling fan of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to Figures 1 to 3, the vehicle cooling fan 500 according to the first embodiment of the present invention, the hub 100 is coupled to the drive shaft and the outer peripheral surface of the hub 100 at regular intervals The plurality of blades 200 are spaced apart along the circumferential direction of the hub 100, and has a structure including a circular ring 300 connecting the ends of the blades (200). At this time, the cooling fan 500 has a number of the blades 200 in the range of 5 to 9, the embodiment of the blade 200 is composed of seven.

Referring to Figure 4, the cooling fan 500 according to the first embodiment, the blades 200 are arranged at equal intervals along the circumferential direction of the hub 100, so that the center of gravity is evenly distributed It is designed to prevent noise and vibration caused by unbalance of the center.

5 and 6, each of the blades 200 will be described in detail.

Referring to FIG. 5, leading edges 210 (LEs) of each of the blades 200 are provided with respect to a set point A positioned between the hub 100 and the circular ring 300. A concave curve is formed in the rotation direction between the hub 100 and the set point A and between the set point A and the circular ring 300, respectively. Specifically, each of the strands 210 of each of the blades 200 may include a first twisted pair wire 211 having a concave curve with respect to the rotation direction between the hub 100 and the set point A, And a second twisted pair wire 212 having a concave curve with respect to the rotation direction between the set point A and the circular ring 300. Accordingly, each of the stranded wires 210 has a structure having one protruding portion at the set point A where the first stranded wire 211 and the second stranded wire 212 meet each other. Here, the protruding portion serves to reduce the rotation noise during rotation.

Here, the set point A is located between the hub 100 and the circular ring 300, and in detail, the set point is a radial direction between the hub 100 and the circular ring 300. Centrally located against the street. This has the effect of dispersing the air inlet time difference.

The protruding portion d1 <d2 at the set point A connects a first point that meets the hub 100 at the leading line 210 and a second point that meets the circular ring 300. It is located inside the virtual connecting line. Here, the protruding portion at the set point (A), because the leading wire is projected on the basis of the set point (A), the air inflow time difference is given to reduce the noise generated by the rotation, the impact You can soften the tone by reducing.

On the other hand, the concave curved shape of the first twisted pair wire 211 and the second twisted pair wire 212 is not a curve having a constant radius of curvature as shown, but a curve having an irregular radius of curvature, which is the blade It can be variously modified according to the design according to the size of the 200, the capacity and structure of the cooling fan 500.

In the first embodiment of the present invention, trailing edges 220 and TE of each of the blades 200 form a smooth convex curve with respect to the direction opposite to the rotation direction. This is to improve the blowing capacity by increasing the flat cross-sectional area of the blade 200.

In addition, each of the blades 200 has a convex shape on the top surface of the upper string 230 and a concave shape on the lower string 240 (see FIGS. 1 and 2). This is because it is a structure that is useful for inflowing air from the upper side and compressing it to the lower side.

As described above, the cooling fan 500 according to the first exemplary embodiment of the present invention has a curve in which the leading wires 210 of the respective blades 200 are concave to both sides based on the set point A. By forming a protruding portion on the leading wire 210 to achieve each, it is possible to reduce the noise during rotation, the trailing wire 220 is convex in the opposite direction of the rotation direction to increase the blowing capacity It is. In addition, since the blades 200 are convex on the upper side and concave on the lower side, the blades 200 are useful for inflowing air from the upper side and compressing them to the lower side.

The blades 200 have a curvature change angle of the trailing wire 210 based on the imaginary line C in the circumferential direction of the hub 100 passing through the set point A. It is formed smaller than the change angle.

Referring to FIG. 6, the cooling fan 500 according to the first embodiment has an angle of attack (θ) of each of the blades 200 with respect to each point of the blades 200. It gradually decreases toward 300. Accordingly, the cooling fan 500 may be spaced apart from the frequency interference with the engine frequency of the vehicle by reducing the resistance as the receiving area gradually increases toward the circular ring, and maintains the proper rotation speed. Here, the angle of attack means an angle at which the blade 200 is inclined with respect to the horizontal plane.

On the other hand, the present invention, the leading wire 210 of each of the blades 200 consists of a curved first twisted wire 211 and the second twisted wire 212 on the basis of the set point (A) Not only the cooling fan 500 according to the first embodiment having one protruding portion by the first twisted pair wire 211 and the second twisted pair wire 212, but also on the twisted pair wire 210b having a set radius of curvature. It includes a cooling fan (500b) structure according to the second embodiment having a protrusion 280 integrally, will be described in detail with reference to FIG.

In the cooling fan 500b according to the second embodiment of the present invention, the leading strands 210b of each of the blades 200b form a smooth concave curve as a whole with respect to the rotational direction. One protrusion 280 protruding to the outside is integrally provided. In addition, in the cooling fan 500b according to the second embodiment, the trailing wires 220 of each of the blades 200b form a smooth convex curve with respect to the direction opposite to the rotation direction.

Here, the protrusion 280 is located between the hub 100 and the circular ring 300, in detail, the center with respect to the radial distance between the hub 100 and the circular ring 300 Located in

The protrusion 280 has a triangular shape in which the frictional resistance of the fluid can be reduced to the maximum and the noise reduction effect can be obtained to the maximum. The protrusion 280 connects a first point B1 that meets the hub 100 at the twisted line 210b and a second point B2 that meets the circular ring 300. It is located inside the connecting line L.

The blades 200b may have an angle of inversion of the leading edge curvature based on an imaginary line C in the circumferential direction of the hub 100 passing through the point where the protrusion 280 is provided. It is formed small.

On the other hand, with respect to the cooling fan (500b) according to the second embodiment, the angle of attack of the blades (200b), except for the configuration of the leading wire 210b and the trailing wire (220b) of the blade (200b), Detailed descriptions on the number, conformal distribution arrangement, and shapes of the top and bottom chords will be omitted since they correspond to the first embodiment.

Cooling fans 500 and 500b according to the first and second embodiments of the present invention according to the above-described structure, the structure of each blade (200, 200b) is a pair of convex curves in the direction of rotation of the twisted line 210 It has a protrusion, or has a protrusion 280 integrally formed on a concave curved leading wire 210b, and the trailing wires 220 and 220b are convex in a direction opposite to the rotation direction. In addition, the rotational noise can be reduced while improving the airflow amount. This effect can be confirmed through the graphs of FIGS. 8 to 9.

FIG. 8 compares the OA (Over All) noise characteristics of the cooling fan 500 according to the first embodiment of the present invention and the OA noise characteristics of the conventional cooling fans (Comparative Examples 1 and 2). As a graph, it can be seen that the OA noise according to the first embodiment of the present invention is less than that of the conventional cooling fan. Here, the OA noise is a noise including both the noise of the motor and the fan, and in this embodiment, since it is difficult to measure only the actual fan noise, the OA noise was measured as the object. In addition, although the graph comparing the first embodiment with the conventional art is shown in the graph, in the case of the cooling fan 500b according to the second embodiment, the structure of the stranded wire of the first embodiment is substantially similar. It can be said that it has the same OA noise characteristics as 8. On the other hand, the cooling fan of Comparative Example 1 is one shovel shape convex blade upper surface and concave lower surface, the cooling fan according to Comparative Example 2 is a structure in which the blade upper surface is convex and two concave shovel shape is connected As compared with the cooling fan 500 of the first embodiment, the blades have different structures.

9 is a graph comparing the BPF (blade passing frequency) characteristics of the cooling fan according to the first embodiment (Example) of the present invention and the BPF characteristics of the conventional cooling fans (Comparative Examples 1 and 2), It can be seen that the peak value and overall value of the BPF noise according to the first embodiment of the present invention are lower than those of the conventional cooling fan.

Meanwhile, the vehicle cooling fans 500 and 50b according to the first and second embodiments described above are applied to vehicle engine cooling fans and mounted on a heat exchanger such as a radiator.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100 ... hub 200,200b ... blade
210,210b ... Twisted Pair 220,220b ... Twisted Pair
300 ... Round ring 500,500b ... Cooling fan

Claims

A hub coupled to a drive shaft, a plurality of blades spaced apart along the circumferential direction of the hub at regular intervals on an outer circumferential surface of the hub, and a circular ring connecting ends of the blades to the vehicle cooling fan. In
Leading edges (LE) of each of the blades are respectively rotated between the hub and the set point and between the set point and the circular ring with respect to a set point located between the hub and the circular ring. Form a concave curve with respect to the direction,
Trailing edges (TE) of each of the blades, the vehicle cooling fan is a smooth convex curve with respect to the direction opposite to the rotation direction.

A hub coupled to a drive shaft, a plurality of blades spaced apart along the circumferential direction of the hub at regular intervals on an outer circumferential surface of the hub, and a circular ring connecting ends of the blades to the vehicle cooling fan. In
The leading edges of each of the blades form an overall smooth concave curve with respect to the rotational direction, and are integrally provided with one protrusion projecting outwardly on the leading edge,
The trailing wires of each of the blades form a smooth convex curve with respect to the direction opposite to the rotation direction.

The method according to claim 2,
The protrusion is a vehicle cooling fan located between the hub and the circular ring.

The method according to claim 2,
The projection part is a vehicle cooling fan having a triangular shape.

The method of claim 4,
The blades,
Cooling fan for a vehicle is smaller than the twisting edge curvature change angle relative to the imaginary line in the circumferential direction of the hub passing through the point provided with the projection.

The method according to claim 1,
The blades,
Cooling fan for a vehicle is smaller than the twisted bending curvature change angle relative to the imaginary line in the circumferential direction of the hub passing through the set point.

The method according to claim 1 or 2,
The blades,
A cooling fan for a vehicle in which an angle of attack gradually decreases toward the circular ring.

The method according to claim 1 or 2,
And the number of blades is in the range of five to nine.

The method according to claim 2,
The protrusion is,
And a vehicle cooling fan positioned centrally with respect to the radial distance between the hub and the circular ring.

The method according to claim 1,
The set point is,
And a vehicle cooling fan positioned centrally with respect to the radial distance between the hub and the circular ring.

The method according to claim 2,
The protrusion is,
And a vehicle cooling fan positioned inside the virtual connection line connecting the first point that meets the hub and the second point that meets the circular ring.

The method according to claim 1,
The protruding portion at the set point,
And a vehicle cooling fan positioned inside the virtual connection line connecting the first point that meets the hub and the second point that meets the circular ring.

The method according to claim 1 or 2,
And the blades are arranged at equal intervals along the circumferential direction of the hub.

The method according to claim 1 or 2,
The blades,
A cooling fan for a vehicle having an upper side convex and a lower side concave.