KR100676318B1 - A Motor Assembly And A Vacuum Cleaner Having The Same - Google Patents

Abstract

A motor assembly and a vacuum cleaner having the motor assembly are disclosed. The disclosed motor assembly includes a suction motor; An inner case surrounding the suction motor; And at least one outer case enclosing at least a part of the inner case, wherein a diffusion path is formed between the inner case and the outer case so that an average cross-sectional area of the diffusion path is increased so as to diffuse as air flows.

Vacuum cleaner, motor assembly, inner case, outer case, diffusion passage

Description

[0001] The present invention relates to a motor assembly and a vacuum cleaner having the same,

1 is a perspective view showing an embodiment of a motor assembly according to the present invention,

FIG. 2 is a sectional view of a main body of a cleaner body and a motor assembly in which the motor assembly of FIG. 1 is installed,

Figure 3 is an overall sectional view of the motor assembly and cleaner body viewed from section III-III in Figure 2,

4 is a graph showing a change in the cross-sectional area of the diffusion path at the points 1, 2, 3, 4, 5, 6,

5 is a graph showing the effect of noise reduction by the motor assembly,

6 is a chart showing the effect of reducing the peak component by the motor assembly.

 Description of the Related Art

10. Vacuum cleaner body 11. Suction pipe

12. Exhaust pipe 100 .. Motor assembly

110 .. Suction motor 110a .. Discharge window

120 .. inner case 121 .. first inner case

121a .. first air passage hole 122 .. second inner case

122b .. second air passage hole 130 .. outer case

131 .. First outer case 132 .. Second outer case

130a .. Third air passage hole 140 .. Supporting member

P1.

The present invention relates to a vacuum cleaner, and more particularly, to a motor assembly for reducing noise generated in a suction motor and a vacuum cleaner having the same.

The vacuum cleaner sucks dust into the dust chamber by the suction force generated when the suction motor is driven. At this time, a high output motor having a high RPM is used for the characteristics of the vacuum cleaner. Such a high output motor generates a large noise during operation.

In order to reduce such noise, Korean Patent Laid-Open Publication No. 1997-32650 discloses a motor case having a sound absorbing material for absorbing noise and a sound insulating material having a dispersion hole formed on the surface thereof to surround the sound absorbing material, There is disclosed a motor case in which a first vent hole is provided in a side face with a second vent hole in the rear face, and a sound absorbing material is provided in the first and second vent holes.

However, the above Korean Patents (1997-32650) and Japanese Unexamined Patent Publication (Kokai) No. Hei 01-268524 have a problem in that a separate sound absorbing material is required to reduce noise, and the configuration is complicated and the cost is increased. In addition, although there is an effect of reducing the BPF (wing pass frequency) and the overall noise level, there is a problem that the low frequency band and the peak component can not be effectively reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems,

First, it is an object of the present invention to provide a motor assembly and a vacuum cleaner having the motor assembly that effectively reduce the low frequency band and the peak component.

Second, it is an object of the present invention to provide a motor assembly and a vacuum cleaner having the same.

According to an aspect of the present invention, there is provided a motor assembly comprising: a suction motor; An inner case surrounding the suction motor; And at least one outer case enclosing at least a part of the inner case, wherein a diffusion path is formed between the inner case and the outer case so that an average cross-sectional area of the diffusion path is increased so as to diffuse as air flows. Here, it is preferable that the cross-sectional area of the diffusion passage increases regularly in a direction in which air flows.

Wherein the inner case comprises: a first inner case having a first air passage hole through which air is introduced into the suction motor; And a second inner case having a second air passage hole through which air is discharged through the diffusion passage.

Preferably, the outer case is formed with a third air passage hole through which air is discharged from the diffusion passage at a position opposite to the second air passage.

Further, the object is achieved by a vacuum cleaner comprising: a vacuum cleaner main body having a suction pipe and an exhaust pipe; A suction motor installed vertically inside the cleaner main body; An inner case surrounding the suction motor and communicating with the suction pipe; And at least one outer case enclosing at least a part of the inner case and communicating with the exhaust pipe, wherein a diffusion path is formed between the inner case and the outer case so that the average cross-sectional area increases, Wherein the vacuum cleaner is a vacuum cleaner. Here, it is preferable that the cross-sectional area of the diffusion passage increases regularly in a direction in which air flows.

Wherein the inner case comprises: a first inner case having a first air passage hole through which air is introduced into the suction motor; And a second inner case having a second air passage hole through which air is discharged through the diffusion passage.

Preferably, the outer case is formed with a third air passage hole through which air is discharged from the diffusion passage at a position opposite to the second air passage. Preferably, the exhaust pipe is disposed adjacent to the third air passage hole.

Hereinafter, a motor assembly according to a preferred embodiment of the present invention and a vacuum cleaner having the same will be described in detail with reference to the accompanying drawings. The arrow indicates the flow of air.

1 is a perspective view showing an embodiment of a motor assembly according to the present invention. FIG. 2 is a cutaway view of a main body of a cleaner body and a motor assembly in which the motor assembly of FIG. 1 is installed.

Referring to FIGS. 1 and 2, the motor assembly 100 includes a suction motor 110, an inner case 120, and an outer case 130.

The suction motor 110 is disposed vertically to the cleaner body 10 to provide a suction force. On the lower circumference of the suction motor 110, a discharge window 110a through which air is discharged is formed. The air introduced from the first air passage hole 121a passes through the interior of the suction motor 110 to the discharge window 110a.

The suction motor 110 uses a high-output motor having a high RPM in view of the characteristics of a vacuum cleaner. Therefore, vibration is generated severely. A support member 140 is installed to prevent such vibration and to vertically support the suction motor 110 in the direction of the load. The support member 140 is installed in the center of the inner case 120, and is suitably a rubber having a thickness of 20 mm to 40 mm in order to prevent vibration and maintain a supporting force.

The inner case 120 includes a first inner case 121 and a second inner case 122.

The first inner case 121 surrounds the upper side of the suction motor 110 and a first air passage hole 121a through which the air is introduced into the suction motor 110 is formed on the upper surface. The first air passage hole (121a) communicates with the suction pipe (11).

On the front side of the suction pipe 11, a dust bag or a cyclone dust collecting device, which is dust collecting means, is provided. It is not shown because it is not a gist of the present invention. The air separated from the dust in the dust collecting means is introduced into the first air passage hole 121a through the suction pipe 11.

The second inner case 122 surrounds the remaining portion of the suction motor 110 from which the first inner case 121 is not wrapped and has a second air passage hole 122b for discharging air to the diffusion passage P1, Is formed on the circumference.

The first inner case 121 and the second inner case 122 are detachably coupled. In this embodiment, the first bolt 20 is used to engage. Of course, in addition to screw coupling, it can be combined in various ways such as hinges and interlocking.

The outer case 130 includes a first outer case 131 and a second outer case 132.

The first outer case 131 surrounds the second inner case 122 from above.

The second outer case 132 surrounds the remaining portion of the second inner case 122 that is not wrapped by the second inner case 122 from below. When the first outer case 131 and the second outer case 132 are coupled to each other, a third air passage hole 130a for allowing air to escape from the diffusion passage P1 (see FIG. 3) to the exhaust pipe 12 is formed . Of course, the third air passage hole 130a may be formed in only one of the first outer case 131 and the second outer case 132.

The third air passage hole 130a is formed at a position opposite to the second air passage hole 122b. In this case, the air that has escaped from the second air passage hole 122b does not immediately go out of the third air passage hole 130a but flows through the diffusion passage P1 in the circumferential direction and then flows through the third air passage hole 130a. ≪ / RTI > By doing so, a change in the flow direction of the air can be generated and the noise can be reduced. The exhaust pipe 12 is installed close to the third air hole 130a so that the air that has escaped from the third air hole 130a is quickly discharged.

The first outer case 131 and the second outer case 132 are detachably coupled. In the present embodiment, the second bolt 30 is used to join. Of course, in addition to screw coupling, it can be combined in various ways such as hinges and interlocking.

Referring to FIGS. 2 and 3, a diffusion path P1 through which air can be diffused is formed between the inner case 120 and the outer case 130. As shown in FIG. More specifically, the diffusion path P1 is surrounded by the outer case 130 and the inner case 121, and the average cross-sectional area gradually increases in the air flow direction into the space formed therein.

This will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is an overall sectional view of the motor assembly and the cleaner main body viewed from the section III-III in Fig. 2, and Fig. 4 is a cross- And a linear graph of the change.

3 and 4, the position (1) of the second air passage hole 122b, the positions (2, 3, 4, 5) where the air flows along the diffusion passage P1, (⑥) of the first air passage hole 130a and the position (⑦, ⑧) where the air that has exited the third air passage hole 130a flows to escape to the exhaust pipe 12 (see FIG. 2) is irregularly increased or decreased (Indicated by a dotted line). However, it can be seen that the average cross-sectional area (indicated by a solid line) representing the average change in cross-sectional area at positions (①, ②, ③, ④, ⑤, ⑥, ⑦, .

Of course, it is preferable to regularly increase the cross-sectional area of the diffusion passage P1 from the beginning. Considering the difficulty of forming the outer case 130 surrounding the inner case 120, the cross-sectional area of the diffusion path P1 is increased or decreased irregularly as in the present embodiment, resulting in an increase in the average cross-sectional area.

The air that has exited through the discharge window 110a of the suction motor 110 passes through the second air passage hole 122b, the diffusion passage P1, the third air passage hole 130a, and the exhaust pipe 12 As it exits, it gradually diffuses and slows the flow rate. The air that has passed through the discharge window 110a of the suction motor 110 is dispersed in the circumferential direction and discharged to the diffusion path P1 through the second air hole 122b. The air flows in the circumferential direction while flowing in the diffusion path P1 and flows vertically through the third air passage hole 130a and flows through the exhaust pipe 12 to the cleaner main body 10, The direction changes.

Thus, the flow rate of the air is slowed and the noise is reduced while the air flow direction is changed. Particularly, the noise and peak components in the low frequency band are effectively reduced. This will be described in detail with reference to FIGS. 5 and 6. FIG. FIG. 5 is a graph showing the effect of noise reduction by the motor assembly, and FIG. 6 is a graph showing a reduction effect of a peak component by the motor assembly.

The overall noise level is reduced by approximately 4.8 dBA when the motor assembly 100 is present compared to the motor assembly 100 without the motor assembly 100. Particularly, noise reduction effect is large in the low frequency range (0 to 2000 Hz).

The peak component is reduced by about 9.0 dBA in the case where the motor assembly 100 is present at the position where the first peak component appears, as compared with the case where the motor assembly 100 is not provided. The case where the motor assembly 100 is located at the position where the second peak component appears is reduced by about 20 dBA as compared with the case where the motor assembly 100 is not provided. The case where the motor assembly 100 is present at the position? Where the third peak component appears is reduced by about 7.0 dBA as compared with the case where the motor assembly 100 is not provided. Therefore, it can be seen that the peak component is significantly improved as compared with the case where the motor assembly 100 is not provided.

Hereinafter, a flow path of air from the motor assembly 100 and the cleaner main body 10 will be described.

2 and 3, the air introduced into the first air passage hole 121a through the suction pipe 11 descends along the inside of the suction motor 110 and then flows through the discharge window 110a to the suction motor 110. [ (110).

The air that has exited through the discharge window 110a is dispersed and discharged to the diffusion path P1 through the second air hole 122b. In the diffusion path P1, the air flows in the circumferential direction while flowing, and then exits the diffusion path P1 through the third air hole 130a.

The air that has escaped through the third air passage hole (130a) rises vertically and exits the exhaust pipe (12).

According to the motor assembly and the vacuum cleaner having the motor assembly of the present invention,

First, as the air escapes through the second air passage, the diffusion passage, the third air passage, and the exhaust pipe, the flow speed is slowed and the direction is changed. This reduces overall noise. Particularly, the noise and peak components in the low frequency band are effectively reduced. This makes the cleaning environment silent.

Second, it is possible to construct a motor assembly in which a diffusion passage is formed between an inner case and an outer case without a sound absorbing material, thereby simplifying the structure of the motor assembly and reducing the cost.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the present invention should not be limited to the described embodiments but should be determined by the equivalents of the appended claims, as well as the following claims.

Claims (9)

Suction motor; An inner case surrounding the suction motor; And And at least one outer case surrounding at least a part of the inner case, Wherein a diffusion path is formed between the inner case and the outer case so that the average cross-sectional area of the diffusion path is increased so as to diffuse as air flows. 2. The fuel cell system according to claim 1, Wherein the cross-sectional area is irregularly repeated so as to increase the average cross-sectional area. The electronic device according to claim 1 or 2, A first inner case having a first air passage hole through which air is introduced into the suction motor; And And a second inner case having a second air passage hole through which air is discharged to the diffusion passage. The method of claim 3, And a third air passage hole through which air is discharged from the diffusion passage is formed in the outer case at a position opposite to the second air passage hole. A vacuum cleaner main body having a suction pipe and an exhaust pipe; A suction motor installed vertically inside the cleaner main body; An inner case surrounding the suction motor and communicating with the suction pipe; And And at least one outer case surrounding at least a part of the inner case and communicating with the exhaust pipe, Wherein a diffusion path is formed between the inner case and the outer case so that an average cross-sectional area of the diffusion path is increased so as to diffuse while flowing air. 6. The fuel cell system according to claim 5, And the cross-sectional area is irregularly repeated so as to increase the average cross-sectional area. 7. The battery pack according to claim 5 or 6, A first inner case having a first air passage hole through which air is introduced into the suction motor; And And a second inner case having a second air passage hole through which air is discharged into the diffusion passage. The vacuum cleaner of claim 7, wherein the outer case is formed with a third air passage hole through which air is discharged from the diffusion passage, at a position opposite to the second air passage hole. The vacuum cleaner according to claim 8, wherein the exhaust pipe is disposed adjacent to the third air passage hole.

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