KR101408917B1 - Axial Flow Fan - Google Patents

Abstract

The present invention relates to an axial flow fan, and more particularly, to an axial flow fan having a first chord shape and a second chord shape with a chord length progressing in a longitudinal direction of the axial fan, And the second waveform shape is formed opposite to each other, thereby reducing the BPF first peak noise value without changing the shape of the other structure.

Description

An axial flow fan

The present invention relates to an axial flow fan, and more particularly, to an axial flow fan having a first chord shape and a second chord shape with a chord length progressing in a longitudinal direction of the axial fan, And the second waveform shape is formed opposite to each other, thereby reducing the BPF first peak noise value without changing the shape of the other structure.

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.

In the front of the engine room of the vehicle, heat exchangers such as the radiator and the condenser are provided. In the heat exchangers, heat exchange occurs between the surrounding air and the heat exchange medium inside the heat exchanger. At this time, in order to increase the heat radiation 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 in the drawing, the axial flow fan 10 is arranged in parallel with the heat exchangers 20 such as the radiator 21 and the condenser 22 with respect to the direction of air blowing so as to cause forced convection of air, So that the flow of air to the core of the heat exchanger 20 is smoothly performed.

The conventional axial fan 10 includes a hub 1; And a plurality of blades (2) arranged radially in the circumference of the hub (1); .

At this time, a fan band (not shown) for connecting the plurality of vanes 2 to each other may be further provided at the tip 4 of the vane 2 (opposite to the side where the hub 1 is formed).

The axial fan is for generating a forced air flow in order to smooth the flow of air passing through the heat exchanger. It is very important to design the shape of the vane for increasing the blowing efficiency. In order to increase the fan flow rate and reduce the noise Korean Patent Publication No. 2007-0025517 (published date: 2007.08.03) has been proposed, which is shown in Fig.

The axial flow fan 10 shown in Fig. 2 has the above-described conventional axial flow fan shape, and a plurality of flow guide projections 3 extending from the vanes 2 are formed.

However, although the axial flow fan shown in Fig. 2 can reduce the flow slip and the peeling phenomenon of the wing bottom, there is a problem that the blowing amount is increased and the noise reducing effect is not large.

In addition, in recent years, automobiles have been used by as many people as everyday necessities, and efforts are being made to further improve the noise so as to provide a more comfortable ride for the driver and the passenger of the vehicle.

At this time, it is necessary to reduce the value of the first peak (hereinafter referred to as "blade passage frequency") passing through the blade together with the noise of the entire axial fan assembly (hereinafter referred to as "overall noise" The first peak noise value of the BPF is regulated so as not to exceed a specific range due to emotional problems.

Therefore, there is a demand for an axial fan having a wing shape that can satisfy the BPF first peak noise value together with the overall noise.

Korean Published Patent Application No. 2007-0025517 (Publication Date: Mar. 2007)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a fan having a chord length of a first waveform shape and a second waveform shape, , The first wave form and the second wave form are formed opposite to each other, thereby reducing the BPF first peak noise value without changing the shape of the other structure.

It is another object of the present invention to provide an axial fan capable of improving noise while satisfying an air flow rate and reducing power consumption for driving an axial fan.

The axial fan (100) of the present invention comprises a hub (110); A plurality of blades 120 radially disposed on a circumference of the hub 110 and coupled to the hub 110; The axial direction of the axial fan 100 is referred to as a longitudinal direction and a length obtained by connecting the leading edge 111 and the trailing edge 112 of the blade 120 is referred to as a chord length The angle formed with the horizontal plane of the axial fan 100 at the trailing edge 112 of the blade 120 is referred to as a setting angle, Wherein the chord length (L) is gradually increased and decreased as the chord length (L) progresses in the longitudinal direction of the axial fan (100), and the installation angle (?) Gradually increases and decreases gradually Wherein the first wave form by the chord length (L) and the second waveform form by the installation angle (alpha) are opposite to each other.

In addition, as the chord length L progresses in the longitudinal direction of the axial fan 100, the first waveform reference line connecting the average value of the two points of the first waveform shape increases gradually, and the installation angle [alpha] The second waveform reference line connecting the average value of the two points of the second waveform shape gradually decreases in the longitudinal direction of the axial flow fan 100.

At this time, the angle of deflection (?) May change as the blade (120) progresses in the longitudinal direction of the axial fan (100).

The axial fan 100 may further include a fan band 130 formed in a torus shape and connecting the tips of the vanes 120 to each other.

Accordingly, in the axial fan according to the present invention, as the wing progresses in the longitudinal direction of the axial fan, the chord length has a first waveform shape, the installation angle has a second waveform shape, and the first waveform shape and the second waveform shape It is possible to reduce the first peak noise value of the BPF without changing the shape of another structure.

Particularly, the axial flow fan of the present invention is advantageous in reducing the first peak noise value of the BPF by reducing or distributing the irregular load due to the air flow applied to the wing.

It is another object of the present invention to provide an axial fan capable of improving noise while satisfying an air flow rate and reducing power consumption for driving an axial fan.

Figure 1 shows a typical heat exchanger and axial flow fan arrangement.
2 is a view showing a conventional axial flow fan.
3 and 4 are a perspective view and a front view of the axial fan according to the present invention;
5 is a view showing a blade of an axial flow fan according to the present invention.
6 is a view illustrating a chord length and an installation angle of an axial fan according to the present invention.
7 is a cross-sectional view of the axial fan vane at a specific point according to the present invention (Pa to Pe partial representation)
8 and 9 are views showing a chord length and an installation angle of an axial fan according to the present invention.
10 is a graph showing the measured noise of an axial flow fan having numerical characteristics as shown in Figs. 8 and 9. Fig.

Hereinafter, the axial flow fan 100 of the present invention having the above-described characteristics will be described in detail with reference to the accompanying drawings.

The axial flow fan 100 of the present invention includes a hub 110 and a blade 120. The chord length L and the setting angle alpha of the blade 120 So that noise can be reduced without changing the configuration of other shrouds or the like, and the air flow characteristics can be satisfied.

The hub 110 forms a central region of the axial flow fan 100, and a rotary shaft is connected to the center of the axial flow fan 100.

In addition, the hub 110 may be equipped with a fan motor for driving the axial fan 100.

The vanes 120 are arranged radially in the circumference of the hub 110, and transfer the air in the axial direction.

The axial fan 100 of the present invention may further include a fan band 130 formed in a torus shape and connecting the respective tips of the vanes 120.

When the fan band 130 is further formed, the structural stability of the entire axial fan 100 can be further enhanced.

In the present invention, the radial direction of the axial fan 100 is defined as the longitudinal direction.

Each of the vanes 120 has a leading edge 111 and a trailing edge 112 opposite to the leading edge 111. The leading edge 111 and the trailing edge 112 are in contact with the air.

The chord length L refers to a length obtained by connecting the leading edge 111 and the trailing edge 112 of the vane 120 and the mounting angle? As shown in FIG. (See Fig. 6)

The horizontal plane of the axial fan 100 refers to the XY plane shown in FIGS. 3 and 4, and as the shape of the blade 120 changes in the longitudinal direction of the axial fan 100, The tangent reference horizontal plane is shifted with respect to the Z axis.

The axial fan (100) of the present invention has a first waveform shape in which the chord length (L) is gradually raised and lowered gradually as the axial fan (100) progresses in the longitudinal direction, and the installation angle Wherein the first wave form by the chord length L and the second wave form by the installation angle alpha are formed in opposite eaves to each other, do.

In the present invention, the first waveform form and the second waveform form are formed in the opposite direction. That is, the chord length L and the installation angle? Have waveforms, respectively, and the chord length L gradually increases The installation angle alpha is gradually lowered.

Further, in the section in which the chord length L is gradually lowered, the installation angle? Is gradually increased.

5 shows an example of designating ten specific points Pa to Pj in the longitudinal direction of the axial fan 100 in the blade 120 and FIG. 7 is a sectional view of the blade 120 at a specific point Pa to a specific point Pf FIG. 8 is a graph showing changes in chord length L by specific points Pa to Pj of the blade 120, and FIG. 9 is a graph showing changes in the installation angles (Pa to Pj) alpha). < / RTI >

The specific point Pa means a rifle portion contacting the hub 110 at the wing 120 and the specific point Pj means a tip portion at which the wing 120 abuts the van band.

In addition, the specific points Pb to Pi indicate the bent portion where the length of the chord is increased and then decreased, or the bent portion is decreased and then increased again.

Accordingly, in the axial fan 100 of the present invention, when the chord length L of the blade 120 is increased, the installation angle? Is lowered to be formed closer to the horizontal plane of the axial fan 100, 120 can be reduced or dispersed due to the irregular load caused by the air flow.

In addition, the chord length L is reduced in an interval in which the installation angle? Is increased, so that the irregular load can be reduced or dispersed throughout the axial flow fan 100 in the longitudinal direction. The axial fan 100 has the advantage of reducing the first peak noise value of the BPF.

At this time, the first waveform reference line gradually increases as the chord length L increases in the longitudinal direction of the axial fan 100, and as the installation angle a progresses in the longitudinal direction of the axial fan 100 It is preferable that the second waveform reference line is gradually decreased.

In the present invention, the first waveform baseline refers to a line that is obtained by calculating an average value of the chord length L measured at two selected specific points of the first waveform formed by the chord length L, , Are shown in Fig.

The second waveform baseline refers to a line that is obtained by calculating an average value of the installation angles? Measured at two selected specific points of the second waveform formed by the installation angle? 9.

7 to 9, the chord length (L) Lb at a specific point Pb is longer (La <Lb) than the chord length (La) La at a specific point Pa, and the installation angle Pa is smaller than the installation angle (?)? A (? A>? B)

In addition, at the specific point Pc, the chord length Lc is shorter than the chord length Lb at a specific point Pb (Lb> Lc) α) is larger than αb (αb <αc).

In addition, the chord length L and the installation angle? Are formed to have a first waveform and a second waveform, respectively, as the axial fan 100 of the present invention progresses in the longitudinal direction of the axial fan 100, As the shape of the one waveform and the shape of the second waveform are formed opposite to each other, the above-described variation is repeated.

7 (a) to 7 (e), the left side is the leading edge 111 side and the right side is the trailing edge 112 side.

3 to 9 show an example of a waveform having an inflection point at nine specific points Pa to Pj in one embodiment of the present invention. However, the present invention is not limited to this, The size of the axial flow fan 100, the number of inflection points, and the like can be further diversified.

In addition, the axial flow fan 100 of the present invention may have a shape in which the angle of deflection β changes with the longitudinal direction of the axial flow fan 100, and in particular, it gradually increases and decreases gradually.

4, when the axial flow fan 100 is viewed in the air flow direction, a line R0 connecting the center O of the hub 110 at the center of the blade root, a line R0 connecting the center O of the hub 110, Refers to the angle beta between the line connecting the center O of the hub 110 at a specific point of the line connecting the center of the axial fan 100 in the longitudinal direction of the axial fan 100.

4, a line connecting the center O of the hub 110 to the center of the blade 110 is denoted by R0, and the center of the blade 120 in the longitudinal direction of the axial flow fan 100 is defined as the longitudinal direction of the axial fan 100 The line connecting the center O of the hub 110 at the first inflection point of the connected line is denoted by R1, and the deflection angle? Is denoted by? 1.

A line connecting the center O of the hub 110 at a second inflection point of a line connecting the center of the vane 120 in the longitudinal direction of the axial flow fan 100 is denoted by R2. β) was expressed as β2.

In more detail, the axial fan (100) of the present invention can be repeatedly increased and decreased in flex angle (?).

In this case, the angle of deflection? May be a backward angle in the direction opposite to the rotation direction or a forward angle in the same direction as the rotation direction, and in FIG. 4, the angle of deflection? Is the backward angle, the forward angle, As shown in Fig.

10A and 10B are graphs showing the noise values. FIG. 10A is a graph showing the relationship between the chord length L of the first waveform and the chord length L of the first waveform shown in FIGS. 8 and 9, 8 shows the noise value of the axial flow fan 100 in which the installation angle? Is changed to the reference line of the second waveform shown in FIG. 8 and FIG. 9, and FIG. The noise value of the axial fan 100 according to the example is shown.

More specifically, the noise value of FIG. 10 (b) has a first waveform shape as shown in FIG. 8 and FIG. 9 as the chord length L progresses in the longitudinal direction of the axial fan 100, ) Have the second waveform form shown in Figs. 8 and 9.

As shown in Fig. 10, the axial fan 100 of the present invention has an effect of lowering the first peak noise value of the BPF.

<Table 1>

Table 1 is a table showing specific measured values of the axial flow fan 100 of the embodiment of the present invention shown in Fig. 10 (b) and the comparative example shown in Fig. 10 (a) And the same voltage as that of the comparative example was maintained. Example 2 was the one shown in Fig. 10 (b), and the measured values were the same as those of the comparative example.

As shown in Table 1, the axial fan 100 of the present invention has significantly lower noise values of the first peak of the BPF than the comparative example, even though the overall noise is not greatly changed in both Embodiment 1 and Embodiment 2 can confirm.

In addition, the axial flow fan 100 of the present invention increases the air flow rate when it is maintained at the same voltage as that of the comparative example in Example 1, and decreases voltage and power consumption when the same air flow rate is maintained in the second embodiment.

It can be seen that the axial fan 100 of the present invention lowers the first peak noise value of the BPF to improve the noise characteristics and further reduce the energy for driving.

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.

100: Axial flow fan
110: hub 111: leading edge
112: Behind the scenes
120: Wings
Pa ~ Pj: Axial flow fan at a specific point of the blade in the longitudinal direction
130: Fan band
O: center of hub
L: Chord length
(La ~ Lj: chord length at a particular point in each wing)
α: Installation angle
(αa to αj: installation angles at specific points of each wing)
β: Deflection angle

Claims (5)

Hub 110; A plurality of blades 120 radially disposed on a circumference of the hub 110 and coupled to the hub 110; Wherein the axial flow fan (100)
The axial direction of the axial fan 100 is referred to as a longitudinal direction and a length obtained by connecting the leading edge 111 and the trailing edge 112 of the wing 120 is referred to as a chord length L, The angle formed with the horizontal plane of the axial flow fan 100 at the trailing edge 112 of the vertical axis 120 is referred to as a setting angle,
As the blade 120 advances in the longitudinal direction of the axial fan 100
Wherein the chord length (L) has a first waveform shape in which the chord length (L) gradually increases and decreases repeatedly,
Wherein the installation angle? Has a second waveform shape in which the rising and falling are repeated gradually,
Wherein the first wave form by the chord length (L) and the second wave form by the installation angle (alpha) are opposite to each other.
The method according to claim 1,
The chord length L is a value obtained by multiplying each of two adjacent points among the plurality of points Pa to Pj selected between the peak and the tip of the blade 120 in the first waveform shape in the longitudinal direction of the axial flow fan 100 And the first waveform reference line connecting the average value of the chord length (L) is gradually increased.
3. The method of claim 2,
The installation angle alpha is set so that the distance between two adjacent points of the plurality of points Pa to Pj selected between the root and tip of the vane 120 on the second wave shape in the longitudinal direction of the axial fan 100 And the second waveform reference line connecting the average values of the installation angles (?) Is gradually reduced.
4. The compound according to any one of claims 1 to 3,
Wherein the wing (120) changes in an angle of flexure (β) as it moves in the longitudinal direction of the axial fan (100).
The method according to claim 1,
Wherein the axial fan (100) further includes a fan band (130) formed in a torus shape to connect the respective tips of the vanes (120).

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