KR20130020968A

KR20130020968A - Axial flow fan

Info

Publication number: KR20130020968A
Application number: KR1020110083192A
Authority: KR
Inventors: 송용진; 나민균
Original assignee: 한라공조주식회사
Priority date: 2011-08-22
Filing date: 2011-08-22
Publication date: 2013-03-05

Abstract

PURPOSE: An axial-flow fan provides a comfortable ride to a driver and passengers by reducing BPT(Blade Passing Tone) noise by using a rib formed on a blade. CONSTITUTION: An axial-flow fan comprises An axial-flow fan(100) comprises a hub(120) and blade units(110). The blade units are radially arranged in the circumference of the hub, and a blade(111) of the blade unit is joined to the hub. A rib(150) is protruded in a cold wind discharging surface of the blade unit along a blade edge direction from the blade. One or more blades are formed in the each blade units. The rib is formed adjacent to a trailing edge(TE), and a distance(L1) between the trailing edge and the rib is less than 20% of the length(L) of the blade.

Description

Axial Flow Fan

The present invention relates to an axial fan of a vehicular fan shroud, and more particularly, to an axial fan for forming a lip on the blade surface of the axial fan to disperse the pressure concentrated in front of the blade.

In general, an engine, a cooling means for cooling the engine, an air conditioner, and the like are provided in an engine room of an automobile. The cooling device is for cooling an engine of an automobile, and includes a radiator for cooling the engine's cooling water and a fan for inducing air flow of the radiator to increase the heat radiation efficiency of the radiator surface and consequently to further promote the cooling water cooling efficiency. Fan Shroud.

The fan shroud is configured to blow air into the heat exchanger to promote heat dissipation of an air-cooled heat exchanger such as a radiator or a condenser of a vehicle, and is a pusher type and a puller type according to the arrangement of the heat exchanger. type).

The pusher type is a type in which the axial flow fan forcibly blows air backwards in front of the heat exchanger. This type is used when there is a small space behind the heat exchanger in the engine room due to the low blowing efficiency for the heat exchanger. Is a type that allows air from the front of the heat exchanger to pass through the heat exchanger at the rear of the heat exchanger, and is applied to most automobiles due to its relatively high blowing efficiency compared to the pusher type.

1 is an exploded perspective view of a heat exchanger and a fan shroud, FIG. 2 is a perspective view of a conventional fan shroud, and FIG. 3 is an exploded perspective view of a conventional fan shroud.

1 to 3, the fan shroud F fixed to the rear end of the heat exchanger to introduce cooling air to the heat exchanger R includes an axial fan 10 and a shroud 30. ), Wherein the fan shroud (F) is an axial fan 10 for blowing, a motor 20 for driving the axial fan 10, and a housing 31 having a blower in the center thereof. And a shroud 30 having a motor fixing part 33 extending from the inner circumferential surface of the tuyere by a plurality of stators 32 in a centripetal direction to fix and support the motor 20.

4 and 5, as shown, the axial fan 10 includes a hub 12; And a plurality of blades 11 disposed radially around the circumference of the hub 12. It will be made including. A fan band 13 may be further provided at the tip 11a of the blade 11 to connect the plurality of blades 11 to each other. As described above, the axial flow fan 10 is for generating forced air to smoothly flow the air passing through the heat exchanger, and the shape design of the blade 11 for increasing the air blowing efficiency is very important. . There has been much research on the shape design of the wing 11 in the past.

On the other hand, in the conventional wing shape design studies, most studies have been conducted to increase the air volume. Increasing the blowing efficiency in the axial fan is directly related to increasing the heat exchanging performance of the heat exchanger. Therefore, the main purpose of the study was to increase the air flow rate. However, in order to maximize the heat exchange performance of the heat exchanger, it is important not only to increase the air volume, but also to optimize the air volume distributed and blown over the entire area of the heat exchanger.

In addition, in recent years, many people are using cars so that they are close to necessities of life, and studies are being actively conducted to give a more comfortable ride to drivers and passengers of vehicles. One of these studies is noise improvement. The conventional axial flow fan is vulnerable to BPT (Blade Passing Tone) noise because the flow pressure of the air flowing away from the blade is concentrated.

BPT noise is also called Discrete Noise. Since the band is high frequency, it is more easily detected than the noise of other bands and is perceived as an unpleasant noise. In addition, the BPT noise plays a dominant role in the generation of overall noise inside the engine room through the distribution of cooling wind inflow and outflow velocity of the blades and interference noise between peripheral components.

Accordingly, in order to reduce driver's and passenger's bodily sensation noise and to provide a comfortable ride, it is urgently required to reduce BPT noise.

The present invention has been made to solve the above problems, an object of the present invention, by protruding the rib (rib) in the wing tip direction (wing tip) from the blade root (wing root) of the cooling wind outlet surface of the axial fan It is to provide an axial fan that reduces the BPT noise that can occur in the axial fan and further reduces the overall noise.

The axial flow fan of the present invention includes a hub (Hub, 120), a plurality of blades (110) radially disposed on the circumference of the hub 120 and the blade root 111 is coupled to the hub (120) In the fan 100, on the cooling wind outlet surface of the blade 110, the lip 150 protrudes along the tip direction from the blade root of the blade 110.

At least one lip 150 is formed at each blade 110, and is formed in close proximity to a trailing edge TE of the blade 110, and is spaced apart from the trailing edge TE. L1) is characterized in that within 20% of the width (L) of the blade (110).

In addition, the blade 110 includes a blade root 111 connected to the hub 120 and a tip 112 connected to the band 130, and a bending angle (Sweep) from the blade root 111 to the tip 112. Angle) direction is changed, the direction of the bending angle is converted to the forward direction when the magnitude of the bending angle decreases with the backward bending angle at the blade 111 and reaches the first pole (P1), the bending angle again at the second pole (P2) The direction is changed to the rearward direction, and the direction of the bending angle is changed to the forward direction at the third pole point P3, characterized in that it changes so that the magnitude of the forward bending angle increases.

In addition, the axial flow fan 100 is formed in a toroidal fan band 130 for connecting each tip 112 of the wing 110; Characterized in that further comprises.

The axial fan of the present invention by the configuration as described above has the effect of providing a comfortable ride to the driver and passengers by reducing haptic noise because it reduces the BPT (Blade passing tone) noise through the lip formed on the blade.

1 is an exploded perspective view of a heat exchanger and a fan shroud
2 is a fan shroud perspective view
3 is an exploded perspective view of the fan shroud
Figure 4 is a perspective view of a conventional axial flow fan
5 is a front view of a conventional axial flow fan
Figure 6 is an axial fan front view of the present invention
Figure 7 is a partial perspective view of the axial flow fan of the present invention
Figure 8 is an enlarged front view of the axial flow fan of the present invention
Figure 9 is a cross-sectional view showing a conventional axial fan pressure flow
10 is a cross-sectional view showing the axial fan pressure flow of the present invention.

1 to 3, the fan shroud (F) to which the axial fan 100 of the present invention is applied is fixed to the rear end of the heat exchanger (R) in order to introduce cooling air into the heat exchanger (R). The drive motor 200 is fixed to the shroud 300 in which the air vents are formed, and the axial fan 100 is rotatably connected to the drive motor 200.

The driving motor 200 is a driving source for blowing air while rotating the axial fan 100 in the same direction for cooling the heat exchange medium passing through the heat exchanger of the vehicle. The drive motor 200 is formed such that the drive shaft protrudes toward the front of the vehicle, the axial fan 100 is coupled to the end of the drive shaft.

The axial fan 100 is a rotary fan that rotates by the driving motor 200 and transmits blown air to the heat exchanger of the vehicle to cool the heat exchange medium circulating therein.

The shroud 300 guides the air blowing generated while the axial fan 100 rotates by the drive motor 200 and is fixed to the heat exchanger of the vehicle while supporting the drive motor 200 as a driving source. It is a member to be installed.

Such a housing 310 of the shroud 300 is provided with a vent for guiding the blowing air sucked in the center in the axial direction, the square corresponding to the shape of the heat exchanger so that the rear surface can contact the entire rear surface of the heat exchanger. It is formed in a shape as a synthetic resin material. Here, the air vent of the housing 310 may be formed in a circular shape so as to reduce the wind pressure loss to increase the air blowing efficiency of the axial flow fan 100. The shroud 300 has a motor fixing part 330 fixedly supporting the driving motor 200 at the center of the tuyere in a state formed by a plurality of stators 320 extending in the centripetal direction from a plurality of points on the inner peripheral surface of the tuyere. ).

At this time, the noise generated by the friction of the cooling wind and the stator 320 flowing when the axial fan rotates will be described in detail the configuration of the axial fan 100 of the present invention for reducing it.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

6 to 8, the axial fan 100 of the present invention is integrally formed by including a blade (Blade) 110, a hub (Hub, 120) and a fan band (Fan band, 130). The basic shape of the axial fan 100 of the present invention is the same as the conventional axial fan shown in FIG. In more detail, the axial fan 100 of the present invention, the hub 120 and a plurality of radially disposed on the circumference of the hub 120 and the wing root (111) is coupled to the hub 120 Blade 110; It is made, including. The wing 110 has a leading edge (LE) and a trailing edge (TE).

In addition, the fan band 130 is formed in an annular shape to connect each tip (wing tip, 112) of the wing (110); May be further included. In addition, the axial flow fan 100 of the present invention, as shown, the blade 110 has a bending angle in which the angle gradually changes from the tip 112 having a forward angle to the blade 111 having a backward angle. The wave fan is preferably a wave fan in which the direction of the bending angle is alternately inverted between the forward angle region on the tip 112 side and the backward angle region on the tip 111 side.

At this time, the present invention has the following characteristic configuration to prevent noise caused by the friction of the cooling wind and the stator 320 flowing when the axial fan 100 rotates.

Ribs 150 are formed in the blade 110. The lip 150 is formed on the cooling wind outlet surface of the blade 110. The lip 150 protrudes along the tip 112 direction from the blade root 111 of the blade 110. Although two lip 150 is illustrated in the blade 110 in the drawing, at least one or more plural may be formed according to the size and shape of the blade 110. However, in order to maximize the noise reduction effect, each blade 110 is preferably formed at least one.

Table 1 shows the results of the BPT noise according to the separation distance (L1) of the lip 150 and the trailing edge (TE).

As shown, the BPT noise decreases until the separation distance L1 between the lip 150 and the trailing edge TE is formed within 20% of the width of the blade 110, and rapidly increases when it exceeds 20% of the width of the blade. It can be seen that.

Therefore, the lip 150 is formed close to the trailing edge TE of the blade 110 and is preferably formed close to the trailing edge TE so as not to exceed 20% of the width of the blade 110. That is, the present invention is characterized in that the separation distance L1 between the lip 150 and the trailing edge TE is within 20% of the blade width L.

The lip 150 may be formed at equal intervals from the rear end (TE) of the blade 110 at equal intervals, and may be formed along the curvature of the blade 110 when viewed from the front.

Referring to FIG. 8, the blade 110 gradually changes in the bending angle in the region between the blade root 111 connected to the hub 120 and the tip 112 connected to the band 130, but the blade root 111. At the maximum backward bending angle and gradually decreasing the size of the backward bending angle and reaching the first pole point P1, the direction of the bending angle is converted to the forward direction, and the direction of the bending angle is switched back to the backward direction at the second pole point P2, The direction of the bending angle is switched to the forward direction at the third pole point P3 and is gradually configured to have a maximum forward bending angle at the tip 112 by increasing the size of the forward bending angle.

In this case, the center line ML is defined as a line connecting the center point of the leading edge (LE), which is an edge in the rotational direction of the blade 110, and the trailing edge, TE, which is an edge in the opposite direction of rotation.

Hereinafter, the operation of the present invention configured as described above will be described with reference to the drawings showing the flow of cooling air flowing along the blades of the prior art and the present invention.

As shown in FIG. 9, the flow of the cooling wind flowing along the conventional blade 11 is illustrated by an arrow, and the cooling wind that is separated along the trailing edge of the blade 10 is concentrated in one place. As the pressure collides with the stator 32, noise is generated. Since the noise is generated periodically according to the number of blades and the rotational speed, the haptic noise sensed by the driver and the passenger becomes larger.

As shown in FIG. 10, the flow of the cooling wind flowing along the blade 110 of the present invention is illustrated by an arrow, and some of the cooling wind flowing along the outflow surface of the blade 110 is lip 150. They are vortexed as they meet, and break away before they reach the trailing edge (TE). Therefore, the pressure concentrated on the stator 32 is dispersed because it is dispersed with the cooling wind that is separated along the trailing edge.

Through the above action, the axial flow fan 100 of the present invention is to improve the BPT (Blade passing tone) noise.

The technical spirit should not be interpreted as being limited to the above embodiments of the present invention. Various modifications may be made at the level of those skilled in the art without departing from the spirit of the invention as claimed in the claims. Therefore, such improvements and modifications fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

F: fan shroud
100: axial fan 110: blade
120: Hub 130: Fan Band
150: Lip
200: motor 300: shroud

Claims

In the axial fan (100) comprising a hub (Hub, 120) and a plurality of blades (110) radially disposed on the circumference of the hub (120) is coupled to the hub (120) ,
On the cooling wind outlet surface of the blade 110,
An axial fan, characterized in that the lip 150 protrudes along the tip direction from the blade root of the blade (110).

The method of claim 1,
The lip 150 is,
At least one axial flow fan, characterized in that formed in each of the blades (110).

The method of claim 1,
The lip 150 is,
It is formed close to the trailing edge (TE) of the blade 110, the separation distance (L1) with the trailing edge (TE) is characterized in that within 20% of the width (L) of the blade (110) Axial flow fan.

The method of claim 1,
The blade 110,
It includes a pterygium 111 connected to the hub 120 and a tip 112 connected to the band portion 130,
The direction of the warp angle (Sweep Angle) is changed from the blade root (111) to the tip (112), the direction of the bending angle is toward the forward direction when the magnitude of the bending angle decreases with the backward bending angle at the blade root 111 reaches the first pole (P1) The axial fan, wherein the direction of the bending angle is switched to the rearward direction again at the second pole point P2, and the direction of the bending angle is switched to the forward direction at the third pole point P3, so that the magnitude of the forward bending angle is changed to increase. .

The method of claim 1,
The axial flow fan 100,
A fan band 130 formed in an annular shape to connect each tip 112 of the wing 110; Axial flow fan, characterized in that further comprises.