KR101263649B1

KR101263649B1 - Axial Flow Fan

Info

Publication number: KR101263649B1
Application number: KR1020100070731A
Authority: KR
Inventors: 윤신원; 유재춘; 민옥렬
Original assignee: 한라비스테온공조 주식회사
Priority date: 2010-07-22
Filing date: 2010-07-22
Publication date: 2013-05-21
Also published as: KR20120009049A

Abstract

The present invention relates to an axial fan, and an object of the present invention is to adopt a blade shaped to maximize the heat exchange efficiency in the heat exchanger and reduce noise by allowing the air volume to be uniformly distributed throughout the heat exchanger. To provide an axial flow fan.
An axial flow fan of the present invention, the hub (Hub, 120); And a plurality of wings 110 disposed radially on the circumference of the hub 120, wherein the blade root 111 is coupled to the hub 120. In the axial fan 100, comprising a center point of the hub 120, the rotation axis direction of the axial fan 100 in the height direction, the radial direction of the axial fan 100 is called a longitudinal direction, When the height change of the blade 110 according to the progression from the blade root 111 to the blade tip 112 is called inclination (R, rake), the blade 110 is closer to the hub 120 in the axial flow. The fan 100 has an inclination inclined toward the upper side, and the tip 112 side of the blade 110 is characterized in that it is formed to have an inclination inclined toward the lower side of the axial flow fan 100.

Description

Axial Flow Fan

The present invention relates to an axial fan.

In the engine where the actual driving force of the vehicle is generated, a lot of heat energy is generated in the process of converting chemical energy into kinetic energy. If such thermal energy is excessively generated, there is a possibility that the parts around the engine and / or the engine are overheated, which may be damaged or destroyed, leading to a great failure and an accident, and the efficiency of the engine itself is greatly reduced. Therefore, in order to eliminate such a problem, a vehicle is usually provided with a device for cooling the engine. As a typical method for cooling an engine, there is a method using cooling water, which includes a radiator for circulating cooling water around the engine and for cooling the cooling water, absorbing heat generated in the engine, Prevents the engine from overheating by releasing heat from the radiator. In addition, a device for cooling indoor air is also provided for the comfort of the vehicle driver and passengers. A heat exchanger such as a condenser is used to cool the refrigerant of the air conditioner for indoor cooling.

Heat exchangers such as radiators and condensers are provided in front of the engine room of the vehicle, and the heat exchangers are generated between the surrounding air and the heat exchange medium inside the heat exchanger. At this time, in order to increase the heat dissipation efficiency of the heat exchanger, an axial fan capable of forcibly blowing air to the heat exchanger is installed.

The axial flow fan is generally accommodated in a fan shroud, a motor or the like for rotating the axial flow fan is fixed to the fan shroud, and the fan shroud is mounted and fixed in position. Thus, the axial fan assembly composed of the axial fan, the fan shroud, the motor, and the like is mounted on the bottom of the heat exchanger or the engine room to be disposed in front of or behind the heat exchanger. Figure 1 illustrates one embodiment of the arrangement of a heat exchanger and an axial fan assembly. As shown, the axial flow fan 100 is arranged in parallel with the heat exchangers 200 such as the radiator 210 and the condenser 220 in the air blowing direction, causing the forced convection of the air The core of the heat exchanger 200 allows the air to flow smoothly.

Figure 2 is a detailed view of a conventional axial flow fan, as shown axial flow fan 100 is a hub (Hub, 120); And a plurality of wings 110 disposed radially around the circumference of the hub 120. It will be made including. A fan band 130 for connecting the plurality of wings 110 to each other may be further provided on the tip 112 side of the wing 110. As described above, the axial flow fan 100 is for causing forced air flow in order to smoothly flow the air passing through the heat exchanger, and the shape design of the blade 110 to increase the air blowing efficiency is very important. . There have been many studies on the shape design of the wing 110 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 exchange performance in the heat exchanger. Therefore, the main purpose of most wing shape design studies was to increase the air volume. 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, a lot of people are using cars as close to the 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. As mentioned above, the problem that the noise is increased when the air blown from the axial fan leaks into the gap between the fan and the shroud has also been pointed out as one of the items to be improved.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to increase the amount of air passing through the heat exchanger in the heat exchanger by collecting the air flow to the center of the heat exchanger to the center The present invention provides an axial fan employing a blade shaped to maximize noise exchange rate and reduce noise by minimizing the amount of air flowing back into the gap between the end of the axial fan and the shroud.

Axial flow fan of the present invention for achieving the above object, the hub (Hub, 120); And a plurality of wings 110 disposed radially on the circumference of the hub 120, wherein the blade root 111 is coupled to the hub 120. In the axial fan 100, comprising a center point of the hub 120, the rotation axis direction of the axial fan 100 in the height direction, the radial direction of the axial fan 100 is called a longitudinal direction, When the height change of the blade 110 according to the progression from the blade root 111 to the blade tip 112 is called inclination (R, rake), the blade 110 is closer to the hub 120 in the axial flow. The fan 100 has an inclination inclined toward the upper side, and the tip 112 side of the blade 110 is characterized in that it is formed to have an inclination inclined toward the lower side of the axial flow fan 100.

At this time, the wing 110 is referred to as the wing effective length (A) the distance from the blade root 111 of the wing 110 to the blade tip 110 of the wing 110, the blade root of the wing (110) When the distance from the inflection point S of the inclination R to the inclination point length B is 111, the B / A value is formed to have a value between 0.1 and 0.5.

In addition, the wing 110 is referred to as the wing effective length (A) the distance from the blade root 111 of the blade 110 to the blade tip 110 of the wing 110, the blade 110, the blade root 111 When the height up to the position of the inflection point (S) of the inclination (S) of the blade 110 is characterized in that the C / A value is formed to have a value between 0.005 to 0.035 do.

In addition, the axial flow fan 100 is formed in a toroidal fan band 130 for connecting each tip 112 of the wing 110; And further comprising:

In addition, the wing 110 has a bending angle that the angle gradually changes from the tip 112 having a forward angle to the blade 111 having a backward angle, the forward angle region and the blade root 111 on the tip 112 side. The direction of the bending angle is inverted alternately between the backward angle region on the side.

According to the present invention, in the blade shape of the axial flow fan, the air flow direction is formed toward the center of the heat exchanger on the blade side and toward the edge of the heat exchanger on the tip side, thereby collecting the air volume spreading outward of the heat exchanger toward the center. There is a great effect of increasing the amount of air flowing through the heat exchanger. Accordingly, the heat exchange performance of the heat exchanger is maximized, thereby increasing the cooling efficiency of the vehicle air conditioning system.

In addition, according to the present invention, by effectively collecting the air flow in the center as described above to minimize the amount of air flow back to the gap between the end of the axial fan and the shroud, the noise generated in the axial fan by the gap back flow can also be greatly reduced. Has a great effect. In addition, according to the present invention, there is an effect that can reduce the size of the axial fan more than conventional, thereby maximizing the engine room space utilization can be obtained.

Figure 1 shows a typical heat exchanger and axial flow fan arrangement.
Figure 2 is a general axial fan shape.
3 and 4 is a comparison of the conventional and the axial flow fan of the present invention.
5 is a comparative perspective view of the conventional and the axial flow fan of the present invention.
6 is a detailed view of the axial fan blade of the present invention.
7 and 8 are axial fan efficiency according to the axial fan blade design parameters of the present invention.

Hereinafter, the axial flow fan according to the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

The basic shape of the axial fan of the present invention is the same as the general axial fan shown in FIG. In more detail, the axial flow fan 100 of the present invention, the hub (Hub, 120); And a plurality of wings 110 disposed radially on the circumference of the hub 120, wherein the blade root 111 is coupled to the hub 120. It is made, including. (The blade 110 has a leading edge (LE) and trailing edge (TE).) In addition, the fan is formed in an annular shape to connect each tip 112 of the blade (110). Band 130; It may be made to include more. In addition, the axial flow fan of the present invention, as shown, the blade 110 has a bending angle that gradually changes the angle from the tip 112 having a forward angle to the blade 111 having a backward angle, the tip It is preferable that it is a wave fan in which the direction of the said bending angle is inverted alternately between the forward angle area | region on the (112) side, and the backward angle area | region on the blade root 111 side.

At this time, when the center point of the hub 120 is the origin, the rotation axis direction of the axial fan 100 in the height direction, the radial direction of the axial flow fan 100 is called the longitudinal direction, the tip 112 in the blade root 111 The height change of the blade 110 according to the progression to the is called a slope (R, rake).

At this time, the axial flow fan 100 of the present invention has a slope inclined toward the upper side of the axial flow fan 100 in the shape of the blade 110 close to the hub 120, The tip 112 side is characterized in that it is formed to have a slope inclined toward the lower side of the axial flow fan (100).

Figure 3 shows a comparison of the blade shape of the conventional and the axial flow fan of the present invention. In FIG. 3, the portion indicated in dark color represents the conventional wing form, and the portion represented in light color represents the wing form of the present invention. Conventional wings are indicated by 110 ', the wings of the present invention divided by 110. In FIG. 3B, the trailing edge TE 'of the conventional wing 110 ′ is highlighted by a dotted white line. In FIG. 3C, the trailing edge TE of the wing 110 of the present invention is black. Highlighted with a solid line.

As indicated by TE 'in FIG. 3 (B), the tail 110' of the conventional wing 110 'is horizontally formed. On the other hand, as shown by TE in Figure 3 (C), in the blade 110 of the present invention has a slope inclined toward the upper side of the axial flow fan 100 on the side close to the hub 120, the blade ( At the tip 112 side of the 110 is formed to have a slope inclined toward the lower side of the axial flow fan (100). FIG. 4 is a perspective view of a conventional wing 110 ′ and a wing 110 of the present invention overlaid. As shown in FIG. 3, the wing of the present invention is shown in dark color and the wing of the present invention is shown in light color. .

As can be seen from the diagram shown in Figure 2, the hub 120 is present in a very large area in the center of the axial fan 100. As the axial fan 100 rotates, wind is generated in the wing 110 region, and it is natural that air blowing does not occur in the hub 120. However, as shown in FIG. 2, since the area of the hub 120 is large enough to be ignored, when the wind proceeds in a direction parallel to the axis of rotation of the axial fan 100, the heat exchanger 200 (see FIG. 1). The amount of air to the center of the is relatively very small, thereby adversely affecting the heat exchange performance in the heat exchanger 200 is deteriorated. Conventionally, as shown by TE 'in FIG. 3 (B), the blade 110' was formed to be horizontal without the inclination R of the trailing edge TE '. Thus, this problem could not be solved. In addition, in the conventional case, as shown in FIG. 5 (A), the wind spreads radially, and the amount of air flowing back into the gap between the end of the axial fan 100 and the shroud is generated. There was also a problem that caused noise.

In the present invention, in order to eliminate such a problem, the wing 110, as it proceeds from the blade root 111 to the tip 112, inclined toward the upper side of the axial flow fan 100 on the side closer to the hub 120 It has a slope to fall, and is formed to have a slope inclined toward the lower side of the axial flow fan 100 at the tip 112 side of the wing (110). That is, in the side closer to the hub 120, the wing 110 has an inclination inclined toward the upper side of the axial flow fan 100 so that air is blown toward the center of the heat exchanger 200, the wing ( At the tip 112 side of the 110, the wing 110 has an inclination inclined toward the lower side of the axial flow fan 100 so that air is blown toward the edge of the heat exchanger 200, resulting in the axial flow. The directionality of the wind blown from the fan 100 is enhanced. In other words, according to the present invention, as shown in FIG. 5 (B), the direction-enhanced wind can be blown, and the heat is blown in a form in which the wind is radially spread as in FIG. 5 (A). By solving the problem that the amount of wind blown toward the air is reduced, it is possible to ultimately increase the amount of wind blown toward the heat exchanger much more than before.

As such, when the airflow volume distribution is optimized, the heat exchange performance is not only increased, but also the noise is also reduced. In more detail, when the wind is radially spread as shown in FIG. 5 (A) in the related art, a reverse flow in which the wind returns to the axial fan 100 'from the outside occurs, and thus the axial fan 100' There is a problem that the noise is generated by the wind leakage into the gap between the end of the shroud and. However, according to the axial flow fan 100 of the present invention employing the wing 110 designed as described above, as shown in FIG. The occurrence of backflow is also suppressed as much as possible, and as a result, the noise is much reduced as compared with the prior art, and thus, there is an advantage that the riding comfort of the vehicle occupant can be further improved.

In addition, as the wing 110 in the axial fan 100 of the present invention is formed as described above, as shown in Figure 3 (B) it is much reduced in height compared to the conventional wing (110 '). It becomes possible. Accordingly, the axial fan 100 of the present invention can be reduced in size compared to the conventional, thereby maximizing the space utilization in the engine room.

6 is a detailed view of the axial fan blade of the present invention. First, the design factors of the axial fan blade of the present invention will be described with reference to FIG. 6.

In FIG. 6, the distance from the blade root 111 of the blade 110 to the blade tip 112 of the blade 110 is referred to as the wing effective length A, and the inclination of the blade root 111 of the blade 110 is measured. The distance to the inflection point S of R) is referred to as the upward inclination section length B, and the height from the blade root 111 to the inflection point S position of the blade 110 inclination R is determined. It is called an upward slope section height (C). Here, the term length / height refers to the length direction / height direction defined above (the rotation axis direction of the axial fan 100 is the height direction, and the radial direction of the axial fan 100 is called the longitudinal direction).

7 and 8 are axial fan efficiency graph according to the axial fan blade design factor of the present invention, through which the optimization value of the design factor is found. In FIG. 7 and FIG. 8, the fan efficiency is expressed by a formula of (air volume x dP _air (air pressure difference between axial fan upper side and lower side) ) / (Torque x RPM) .

First, FIG. 7 illustrates a change in fan efficiency according to a value of B (upward inclined section length) / A (wing effective length). As shown in the drawing, the fan efficiency is maximized at a B / A value of about 0.35, so that the shape of the blade 110 may be designed such that the B / A value is about 0.35. More broadly, the blade 110 is formed such that the B / A value has a value between 0.1 and 0.5.

Next, FIG. 8 shows a change in fan efficiency according to the value of C (upward inclined section height) / A (wing effective length). As shown in the figure, as the C / A value gradually increases from zero, the fan efficiency also tends to increase, and after a certain point, the fan efficiency tends to fall again. Therefore, the C / A value is preferably determined in a section in which the fan efficiency value becomes equal to or greater than the fan efficiency value when the C / A value is zero. More specifically, the wing 110 is formed so that the C / A value has a value between 0.005 and 0.035.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

100: axial fan 110: wing
111: pterygium 112: pterygium
200: heat exchanger
210: radiator 220: condenser

Claims

Hub 120; And a plurality of wings 110 disposed radially on the circumference of the hub 120, wherein the blade root 111 is coupled to the hub 120. Wherein the axial flow fan (100)
The center point of the hub 120 is the origin, the rotation axis direction of the axial fan 100 in the height direction, the radial direction of the axial fan 100 is called a longitudinal direction,
When the height change of the wing 110 according to the progression from the blade root 111 to the blade tip 112 is called inclination (R, rake),
The blade 110 has a slope inclined toward the upper side of the axial flow fan 100 near the hub 120, and inclined toward the lower side of the axial flow fan 100 at the tip 112 side of the blade 110. Loss is formed to have a slope,
The distance from the blade root 111 of the blade 110 to the blade tip 112 of the blade 110 is called the wing effective length A, and the inflection point of the inclination R at the blade root 111 of the blade 110. When the distance to (S) is referred to as an upward slope section length (B),
Axial flow fan, characterized in that the B / A value is formed to have a value between 0.1 to 0.5.

delete

The method of claim 1, wherein the wing 110 is
The distance from the blade root 111 of the blade 110 to the blade tip 112 of the blade 110 is referred to as the wing effective length A, and the blade 110 is tilted from the blade root 111 of the blade 110. When the height to the inflection point (S) position of R) is referred to as the upward slope section height (C),
Axial flow fan, characterized in that the C / A value is formed to have a value between 0.005 to 0.035.

According to claim 1, wherein 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.

The method of claim 1, wherein the wing 110 is
It has a bending angle in which the angle gradually changes from the tip 112 having the turning angle to the blade 111 having the turning angle, and is located between the turning angle region at the tip 112 side and the turning angle region at the tip 111 side. An axial fan, characterized in that the direction of the bending angle is reversed alternately.