KR101156413B1 - Complex of fan and shroud - Google Patents

Abstract

The present invention relates to a fan and shroud assembly used for a vehicle air conditioner, comprising a hub (21) rotated about one axis and a plurality of blades (22) extending outward from the hub (21) A fan and shroud assembly comprising a fan (20) and a shroud (10) arranged to surround the fan (20) and for controlling air blowing by rotation of the fan (20); The shroud 10 is formed along the circumferential surface of the guide ring 11 and the circumferential surface of the guide ring 11 spaced apart a predetermined distance from the circumference connecting the ends of the blade 22 of the fan 20 And an inlet portion 16a, a circular portion 16b, and a neck portion 16c, which extend in the width direction of the guide ring 11, wherein the rear end of the sound absorbing port 16, which is an air inflow direction, is opened. It is characterized by including.

The fan and shroud assembly according to the present invention is significantly reduced in noise by using the sound absorbing opening 16 formed in the guide ring portion 11 of the shroud 10 than the conventional shroud employing the vortex preventing teeth. It is effective.

Shroud, Fan, Noise, Sound Intake, Peak Noise, P-Q Lead, Air Flow, Static Pressure

Description

Fan and Shroud Assembly {Complex of Fan and Shroud}

1 is a front view illustrating an example of a general axial flow fan.

2 is a rear perspective view of a shroud according to the prior art.

3 is a front view and a partially enlarged view of a shroud according to the prior art.

4 is a partial side cross-sectional view of a fan and shroud assembly according to the prior art.

5 is a cross-sectional view showing a fan and shroud assembly according to the present invention.

Figure 6 is an exploded perspective view showing a fan and shroud of the present invention.

Fig. 7 is a detail view of the portion A ″ in Fig. 6.

8 is a front perspective view of a shroud which is a main component of the present invention;

Fig. 9 is a sectional view showing the dimension definition (a) and arrangement (b) of a sound absorber (Resonator) formed in the shroud.

10 is a diagram comparing / showing noise spectra at the same amount of air as a conventional fan-shroud assembly.

11 is a P-Q diagram of a shroud according to the static fan variation of the present invention with the existing fan-shroud assembly.

*** Description of the symbols for the main parts of the drawings ***

10: shroud 11: guide ring

12: Housing 13: air vent

14: motor support 15: rib

16: sound absorption port

20: Fan 21: Hub

22: Blade 23: Band

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan and a shroud assembly used for blowing in a vehicle air conditioner, and in particular, a swirling airflow and an upstream airflow using a sound absorbing hole formed in the shroud during air blowing by rotation of the fan. It relates to a fan and shroud assembly that can suppress the generation to effectively reduce the noise.

 An air conditioner of a vehicle is provided with an axial fan for cooling a heat exchange medium passing through a heat exchanger such as a radiator or a condenser. As shown in FIG. 1, the general axial fan 200 includes a hub 230 coupled to a shaft of a driving source such as a motor, and a plurality of blades 210 disposed radially around the hub 230. In order to prevent deformation of the blades 210, a fan band 220 connecting the ends of the blades 210 may be further provided. Accordingly, air may be blown in the axial direction by the blades 210 while the axial fan 200 is rotated by the rotational force transmitted from the driving source to the hub 230. The shroud is fixed to the heat exchanger to effectively guide the air blown by the axial fan 200 toward the heat exchanger. Such a shroud is formed to support a motor as a driving source while having a blower of a size in which an axial fan can be rotatably inserted to guide the air blowing.

The shroud 100, which is installed at the rear of the heat exchanger and sucks air from the heat exchanger front and blows air to the rear of the heat exchanger, constitutes the shroud 100 shown in FIGS. 2, 3, and 4. As shown, a housing 110 having a blower port 120 into which the axial fan 200 is rotatably inserted, and a motor (not shown) for rotating the axial fan 200 in the center of the blower hole 120 of the housing. The motor support ring 130 for supporting the motor support ring 130 and the motor support ring 130 and the housing 110 to guide the air discharged during rotation of the axial fan 200. Consists of a plurality of guide feathers (140) connecting radially.

The housing 110 has a shape recessed rearward to effectively guide the suctioned air to the air outlet 120, the coupling ribs are formed at the edge of the housing 110 for coupling to the heat exchanger.

The blower 120 is formed by a guide ring 150 protruding rearward from the housing 110, and is bent inward of the guide ring 150 at the rear end of the guide ring 150 to discharge the air. It may be further provided with a bell mouse 180 to guide smoothly.

Here, a plurality of vortex preventing teeth 160 are formed along the inner circumferential surface of the tuyere 120, that is, the inner circumferential surface of the guide ring 150. When the bell mouse 180 is provided, the vortex preventing teeth 160 are integrally formed on the inner circumferential surface of the portion connected to the bell mouse 180 of the guide ring 150.

The vortex preventing teeth 160 are arranged to maintain a predetermined gap with the ends of the blades 210 of the axial fan 200. The vortex preventing tooth 160 has a first surface 162 in the rotational direction of the axial fan and a second surface 164 in the opposite direction of rotation.

Although the shroud with the vortex preventing teeth has an effect of reducing noise, when the noise generated from the vehicle is added, the noise generated from the fan and the shroud assembly is further increased as a whole. In order to improve this, there has been proposed a configuration of bending the bell mouse to smoothly discharge the air into the guide ring. However, according to the related art, not only an additional structure is required but also a noise reduction effect is insufficient.

The present invention has been made to solve the above problems, the fan and shroud assembly further improves the noise reduction effect by arranging a plurality of sound absorbers along the inner circumferential surface of the guide ring of the shroud so that the sound absorbers absorb the noise energy. The purpose is to provide.

According to the fan and shroud assembly of the present invention devised to achieve the above object, a fan having a hub rotated about one axis and a plurality of blades extending outward from the hub, and the fan A fan and shroud assembly, comprising: a shroud arranged to enclose a shroud for regulating air blowing by rotation of the fan; The shroud is formed in a plurality of guide rings spaced apart from the circumference connecting the ends of the blade of the fan, a predetermined distance along the circumferential surface of the guide ring portion, the inlet, the circular portion and the neck width of the guide ring It is characterized in that it comprises a sound absorbing port extending in the direction and the rear end portion is opened in the direction in which air is introduced.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of terms in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

FIG. 5 is a cross-sectional view of the fan and shroud assembly according to the present invention, FIG. 6 is an exploded perspective view of the fan and shroud assembly according to the present invention, and FIG. 7 is an enlarged view of part A of FIG. 8 is a front perspective view of a shroud which is a main component of the present invention, and FIG. 9 shows a stipulation and arrangement of sound absorbing holes formed in the shroud.

The fan and shroud assembly according to the present invention includes a fan (20) having a hub (21) rotated about one axis and a plurality of blades (22) extending outward from the hub (21), and the fan It is arranged to surround the 20 and consists of a shroud 10 for adjusting the air blowing by the rotation of the fan 20, the air is blown from the back side to the front side as the fan 20 is focused.

Here, the shroud 10 includes a guide ring 11 spaced a predetermined distance from the circumference connecting the ends of the blade 22 of the fan 20, the guide ring 11 in the width direction A plurality of sound absorbing openings 16 are formed along the circumferential surface of the rear end portion, which extends and is open at the rear end portion in the air inflow direction.

In addition, the shroud 10 is a housing 12 having a blower 13 into which the fan 20 is inserted, and a motor (shown in the center portion of the blower 13) to drive the fan 20. And a rib 15 connecting the motor support 14 and the housing 12 to each other. In addition, the fan 20 includes a band 23 connecting the ends of the blades (22).

Looking at the cross-section of the sound absorbing opening 16, the inlet portion (16a) of a predetermined width is formed on the inner peripheral surface of the guide ring portion 11, the circular portion (D) of a predetermined diameter (D) inside the guide ring portion (11) 16b) is formed, and it can be seen that the neck portion 16c of the predetermined length L has a structure connecting the inlet portion 16a and the circular portion 16b. In addition, the sound absorbing opening 16 has a structure in which an end portion of the rear side through which air is introduced is opened.

In the fan and shroud assembly of the present invention, since the sound absorbing port 16 formed on the inner circumferential surface of the guide ring 11 of the shroud 10 absorbs sound energy into heat energy or the like, the fan 20 is adapted to the rotation of the fan 20. Therefore, the noise generated when blowing can be reduced.

Here, the main factors for determining the shape of the sound absorbing port 16 are the diameter D of the circular portion 16b, the length L of the neck portion 16c, and the width S of the inlet portion 16a. The performance will vary from time to time. In addition, the noise reduction effect is changed by changing the number N of the sound absorbing holes 16 formed in the guide ring 11 as a whole.

As a result, the main factors for determining the effect of the present invention are the diameter D of the circular portion 16b, the length L of the neck portion 16c, the width S of the inlet portion 16a, and the sound absorbing port formed in the guide ring portion 11. It can be seen that the number N and the like of (16).

The range of said determination factor is said D is 5.0 mm or more and 30.0 mm or less, The said L is 1.0 mm or more and 10.0 mm or less, The said S is 1.0 mm or more and 5.0 mm or less, The said N is 20 or more and 60 or less Is the most effective.

In the following, the results of the test with the fan and shroud assembly to which the saw-tooth vortex preventing teeth according to the prior art are applied and the fan and shroud assembly according to the present invention will be described.

In the test method, a fan and a shroud assembly were mounted on a heat exchanger, and 12V was applied, preheated for 15 minutes, and the rotational speed, the airflow, and the noise at the same airflow were measured, respectively. 1 and the same result as in FIG. 10 was obtained.

In addition, the air flow rate was measured at each static pressure while the pressure was reduced at intervals of 2 mmAq from 12.0 to 0.0 mmAq to the static pressure in a single state, and the results as shown in FIG. 11 were obtained.

Looking at the results of the experiment shown in Table 1 and Figure 10, when the same voltage (12V, 13.5V) compared to the conventional fan and shroud assembly, the overall noise of the fan and shroud assembly of the present invention was reduced and noise spectrum It can be seen that the first peak value of is also improved. However, the wind volume decreased slightly and power consumption was equal.

On the other hand, when the same amount of air, the power consumption is slightly increased when the shroud with the sound absorbing port 16 is formed, the overall noise was reduced by about 0.7dB and the first peak noise was also improved by about 7.6dB.

In addition, referring to the P-Q diagram of FIG. 11, it can be seen that the air volume Q and the power consumption are almost equal in the total static pressure region P when viewed based on the sawtooth shroud.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

As described above, in the fan and shroud assembly according to the present invention, a plurality of sound absorbing holes 16 formed by opening the rear side in the direction in which air flows into the guide ring portion 11 of the shroud 10 are blown off. Since the noise generated from the noise reduction effect is more effective than using a shroud employing the vortex preventing teeth.

Claims (4)

A fan 20 having a hub 21 rotated about one axis and a plurality of blades 22 extending outward from the hub 21, and a fan 20 arranged to surround the fan 20. In the fan and shroud assembly comprising a shroud (10) for adjusting the air blowing by the rotation of), The shroud 10 is formed along the circumferential surface of the guide ring 11 and the circumferential surface of the guide ring 11 spaced apart a predetermined distance from the circumference connecting the ends of the blade 22 of the fan 20 And formed of an inlet portion 16a, a circular portion 16b, and a neck portion 16c, extending in the width direction of the guide ring portion 11, wherein the neck portion 16c is circumferentially along the width direction of the guide ring portion. A fan and shroud assembly, characterized in that it has a sound absorbing opening (16) that is open, a rear end of which is a direction in which air is introduced, and a front end of which is closed. The method of claim 1, The sound absorbing opening 16 has a width S of the inlet portion 16a of 1.0 mm or more and 5.0 mm or less, a diameter D of the circular portion 16b of 5.0 mm or more and 30.0 mm or less. The length L of 16c is 1.0 mm or more and 10.0 mm or less, The fan and shroud assembly characterized by the above-mentioned. The method of claim 1, The sound absorbing port (16), the fan and shroud assembly, characterized in that 20 to 60 is formed at predetermined intervals along the circumferential direction of the shroud (10). The method of claim 1, The fan (20), the fan and shroud assembly further comprises a band (23) for connecting the ends of the blades (22).

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