KR101163769B1 - Complex of Fan and Shroud - Google Patents

Abstract

The present invention relates to a fan and shroud assembly for a vehicle air conditioner, and includes a hub (20) rotated about one axis and a fan (20) provided with a plurality of blades (22) extending outward from the hub (21). In the fan and shroud assembly comprising a shroud (10) and a shroud (10) arranged to surround the fan (20) to control the air blowing by the rotation of the fan (20); The shroud 10 has a guide ring 11 at a position spaced apart from the circumference connecting the ends of the blade 22 of the fan 20 by a predetermined distance, and the guide ring 11 has the blade ( It is characterized in that the semicircular pleated vortex prevention means 16 is formed to block the flow of the vortex generated along the circumferential surface connecting the ends of the 22).

According to the fan and shroud assembly according to the present invention, the semi-circular corrugation formed along the inner circumferential surface of the tuyere of the shroud has the effect of minimizing the generation of vortices and backflow to further reduce noise.

Shroud, Fan, Noise, Semi-circle wrinkle, Guide ring, Semi-circular mountain, Vortex, Backflow

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 the fan 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 detailed view of part “A” of FIG. 6.

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

9 is a cross-sectional view showing the stipulation and arrangement of the semicircular wrinkles 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: vortex prevention means (semi-circular pleats)

20: Fan 21: Hub

22: Blade 23: Band

The present invention relates to a fan and a shroud assembly used for blowing in a vehicle air conditioner, and in particular, it is possible to effectively reduce noise by suppressing the occurrence of swirling air and upstream airflow during the air blowing caused by the rotation of the fan. A pan and shroud assembly that can be used.

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.

Shroud 100, which is installed at the rear of the heat exchanger and draws air from the front of the heat exchanger and blows air to the rear of the heat exchanger, is illustrated 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 for rotating the axial fan 200 in the center of the blower hole 120 of the housing (not shown). Motor support ring 130 for supporting the motor support ring 130 and the motor support ring 130 and the housing 110 to support the motor support ring 130 and guide the air discharged when the axial fan 200 rotates. ) Comprises 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.

However, although the shroud provided with such a vortex preventing tooth has an effect of reducing noise, when the noise generated from the vehicle is combined, the noise generated from the fan 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, it is possible to further improve the effect of noise reduction by installing a non-return means in the guide ring of the shroud that maintains a gap between the circumference and the blade connecting the blade ends of the fan It is an object of the present invention to provide a fan and shroud assembly.

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 provided with a guide ring at a position spaced apart from the circumference connecting the ends of the blade of the fan, the guide ring to block the flow of vortex generated along the circumferential surface connecting the end of the blade It is characterized in that the semicircular pleated vortex prevention means is formed.

In addition, the vortex preventing means is characterized in that the semi-circular mountain of the predetermined radius projecting in the blade direction and the circumferentially protruding shape, the bone connecting the semi-circular acid is continuously arranged in a row.

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

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 the shroud which is a main component of the present invention, and FIG. 9 shows the dimension definition and arrangement of the semicircular pleats 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. The shroud 10 is arranged to surround the 20 and controls the air blowing by the rotation of the fan 20, and the predetermined distance from the circumference connecting the ends of the blade 22 of the fan 20 The guide ring part 11 provided in the shroud 10 and the vortex prevention means for blocking the flow of vortices formed along the circumferential surface formed on the guide ring 11 and connecting the end of the blade 22 It is composed.

The shroud 10 includes a housing 12 having a blower 13 into which the fan 20 is inserted, and a motor (not shown) positioned at a central 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, wherein the vortex preventing means includes a semicircular pleat 16 formed in the guide ring 11. to be.

In addition, the fan 20 includes a band 23 connecting the ends of the blades (22). Thus, the band 23 and the semi-circular corrugation 16 is arranged with a predetermined gap.

Here, the semi-circular corrugation 16 has a shape in which the semicircular hill 16a having a predetermined radius R protruding in the blade direction is recessed in the outer circumferential direction, and the valleys 16b connecting the semicircular hill 16a are continuous. As it is arranged repeatedly.

The fan and shroud assembly of the present invention configured as described above slightly reduces power consumption but reduces noise by minimizing the generation of vortices.

When the fan 20 is rotated as the motor is driven, air is blown from the suction side to the discharge side of the shroud 10. That is, the air flow from the suction side to the discharge side is formed in the tuyere 13 of the shroud 10, the outermost portion of the air flow in contact with the guide ring portion 11 of the shroud 10 do.

Therefore, friction is generated between the air and the guide ring 11, and the friction reduces the flow rate of the outermost part of the air flow, and the flow rate becomes (-) near the air outlet of the shroud 10. Backflow occurs. This backflow causes vortices, and the occurrence of vortices is a factor inducing noise.

However, in the present invention, since the semi-circular corrugation 16 is formed in the guide ring portion 11, friction between the air flow and the guide ring portion 11 is reduced. That is, the friction between the air flow and the guide ring 11 is reduced due to the semicircular peaks 16a and the valleys 16b of the semicircular corrugations 16. As the friction decreases, the flow rate of the air flow hardly decreases, thereby minimizing the occurrence of backflow and vortex flow. Thus, noise due to backflow and vortex generation is also minimized.

The main factors determining performance in relation to the above noise reduction effect are the radius R of the semicircular mountains 16a and the number N of semicircular mountains 16a constituting the semicircular corrugations 16. At this time, the semi-circular acid 16a preferably has a radius R of 5.0 mm or more and 30.0 mm or less, and the valley 16b is shown by connecting the semi-circular acid 16a. In addition, it is preferable that the number of the semi-circular acids 16a formed along the circumferential direction of the guide ring 11 is 20 or more and 60 or less.

Hereinafter, the results of testing with the fan and shroud assembly to which the 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 air volume, the fan and shroud assembly of the present invention slightly increased power consumption, the overall noise was reduced by about 0.7dB and the peak noise was also improved by about 3.0dB.

In addition, referring to the P-Q diagram shown in 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-shaped 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, according to the fan and shroud assembly according to the present invention, the semicircular folds formed along the inner circumferential surface of the tuyeres of the shroud minimize the occurrence of vortices and backflow, thereby further improving noise reduction.

Claims (5)

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 has a guide ring 11 at a position spaced apart from the circumference connecting the ends of the blade 22 of the fan 20 by a predetermined distance, and the guide ring 11 has the blade ( The vortex prevention means 16 of the semi-circular pleat form is formed to block the flow of vortices generated along the circumferential surface connecting the ends of 22), The vortex preventing means 16 has a semicircular peak 16a having a predetermined radius R protruding in the blade direction and a bulge 16b protruding outward circumferentially, and the valley 16b connecting the semicircular peak 16a continuously. Fan and shroud assembly characterized in that arranged repeatedly delete The method of claim 1, The semi-circular acid (16a) is a fan and shroud assembly, characterized in that the radius (R) is 5.0mm or more and 30.0mm or less. The method of claim 1, The vortex preventing means (16) is formed along the circumferential direction of the guide ring (11), and the fan and shroud assembly, characterized in that the number of the semi-circular acid (16a) 20 to 60 or less. 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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