JP3345992B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for industrial or domestic use.

[0002]

2. Description of the Related Art In recent years, the output of a vacuum cleaner has been increased, and the noise of the cleaner, which has become larger, has become a problem.

[0003] A conventional vacuum cleaner will be described below. As shown in FIG. 7, a dust collecting chamber 2 is formed in the front of a main body 1 of the vacuum cleaner, and a fan motor chamber 3 is formed in the rear. A rear cover 5 having an exhaust filter 4 is provided behind the main body 1, a concave portion 6 is provided on an outer surface of the rear cover 5, and an exhaust hole 7 having a large opening is provided in the concave portion 6. A soundproof plate 9 having a sound absorbing material 8 is disposed facing the exhaust hole 7 and at a substantially right angle to the exhaust flow.

[0004]

However, in the above-mentioned conventional construction, the exhaust flow is bent at a substantially right angle because the soundproof plate is provided immediately after the exhaust hole, so that the exhaust flow has a structure with a high pressure loss and a high power loss. It is a factor of decline. Also, there is only a small flow of exhaust gas inside the sound absorbing material, and most of it is exhausted through the exhaust passage surrounded by the exhaust hole and the sound absorbing material, so the intake material is not effectively used, and it is included in wind noise and exhaust However, there is a problem that vibration noise of the fan motor is not effectively silenced and exhaust noise is loud.

[0005] The present invention is intended to solve the above problems, and an object thereof is to provide a vacuum cleaner having a reduced-up and noise work rate due to reduced exhaust resistance.

[0006]

In order to achieve the above object, a vacuum cleaner according to the present invention is provided with an exhaust filter at the rear of a vacuum cleaner having a dust collecting chamber disposed at the front and a fan motor chamber disposed at the rear. The rear cover is provided with a concave portion protruding inward in the rear cover, and an exhaust hole having a large opening communicating with the fan motor chamber is provided at the bottom of the concave portion. A sound absorbing material is provided at a position substantially perpendicular to the exhaust flow, and a sound insulating plate is provided behind the sound absorbing material via a space, and each of the spaces between the rear cover and the sound absorbing material and between the sound absorbing material and the sound insulating plate. Is an exhaust passage.

[0007]

According to this structure, a part of the exhaust gas flowing out of the exhaust hole is buffered by the exhaust gas reflected by the sound absorbing material.
The air is exhausted through an exhaust passage formed by the exhaust filter and the sound absorbing material. In addition, a part of the exhaust flow passes through the sound absorbing material, and the exhaust flow reflected by the sound insulating plate further passes through an exhaust passage formed by the sound absorbing material and the sound insulating plate while buffering the exhaust flow passing through the sound absorbing material. The exhaust flow is further exhausted outside the machine while buffering the exhaust flow exhausted through an exhaust passage formed by the exhaust filter and the sound absorbing material.

As described above, the exhaust energy is reduced by buffering the exhaust flow, and the sound absorbing effect is increased by providing the exhaust passages on both sides of the sound absorbing material, so that the noise such as wind noise can be greatly reduced.

Further, the power can be increased by reducing the exhaust resistance by increasing the exhaust passage. Thus, a high-output vacuum cleaner that reduces noise such as wind noise can be provided.

[0010]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1, 2 and 3, a dust collection chamber 2 is formed in the front of a main body 1 of the vacuum cleaner, and a fan motor chamber 3 is formed in the rear. A rear cover 5 having an exhaust filter 4 is provided behind the main body 1, a concave portion 6 is provided on an outer surface of the rear cover 5, and an exhaust hole 7 having a large opening is provided in the concave portion 6. Here, an exhaust passage 11 through which an exhaust gas flows is provided between the exhaust filter 4 and the sound absorbing material 8. A soundproof plate 9 provided with a sound absorbing material 8 facing the exhaust hole 7 and substantially at right angles to the exhaust flow is provided.

Further, an exhaust passage 10 through which an exhaust gas flows is provided between the sound absorbing member 8 and the soundproof plate 9. Arrow a indicates the direction of the exhaust hole.

Here, the soundproof plate 9 is fixed to the cleaner body via four bosses 12, and the sound absorbing material 8 is provided on the boss 1
2 and the soundproof plate 9 for fixing.

The operation of the exhaust structure configured as described above will be described with reference to FIGS. By providing an exhaust hole 7 having a large opening and a soundproof plate 9 having a sound absorbing material 8 in the rear cover 5, the exhaust filter 4 is protected by the soundproof plate 9, so that a grid-like rib or the like is not required, and exhaust is performed. Since the flow passes through the large aperture, the generation of wind noise can be reduced.

A part of the exhaust gas flowing out of the exhaust hole 7 is
The exhaust passage 11 formed by the exhaust filter 4 and the sound absorbing material 8 while buffering the reflected flow of the exhaust reflected by the sound absorbing material 8.
Will be exhausted. A part of the exhaust flow passes through the sound absorbing material 8, and the exhaust flow reflected by the soundproof plate 9 further buffers the exhaust flow passing through the sound absorbing material 8 while buffering the exhaust flow.
The exhaust flow is exhausted through an exhaust passage 10 formed by the soundproof plate 9 and the exhaust flow. The exhaust flow further buffers the exhaust flow exhausted through the exhaust passage 11 formed by the exhaust filter 4 and the sound absorbing material 8. However, it will be exhausted outside the aircraft.

As described above, the exhaust energy is reduced by buffering the exhaust flow, and the sound absorbing effect is increased by providing the exhaust passages on both sides of the sound absorbing material, so that noise such as wind noise can be significantly reduced.

Further, the power can be increased by reducing the exhaust resistance by increasing the exhaust passage. Thus, a high-output vacuum cleaner that reduces noise such as wind noise can be provided.

Reference Example Hereinafter, a reference example of the present invention will be described with reference to the drawings. As shown in FIGS. 4, 5 and 6, a dust collecting chamber 22 is formed at the front inside a main body 21 of the vacuum cleaner, and a fan motor chamber 23 is formed at the rear. A rear cover 25 having an exhaust filter 24 is provided behind the main body 21, a concave portion 26 is provided on the outer surface of the rear cover 25, and an exhaust hole 27 having a large opening is provided in the concave portion 26. Here, an exhaust passage 31 through which an exhaust gas flows is provided between the exhaust filter 24 and the sound absorbing material 28. Facing the exhaust hole 27,
Further, a soundproof plate 29 provided with a sound absorbing material 28 positioned substantially at right angles to the exhaust flow is provided.

Here, the soundproof plate 29 is fixed to the cleaner body via four bosses 33, and the sound absorbing material 28 is fixed by being sandwiched between the boss 12 and the soundproof plate 29.

Further, an exhaust passage 30 through which an exhaust gas flows is provided between the sound absorbing member 28 and the soundproof plate 29.

The soundproof plate 29 has holes 32 through which the exhaust gas flows.
Are provided. Arrow a indicates the direction of the exhaust hole.

The operation of the silencing structure configured as described above will be described with reference to FIGS. By forming a hole 32 through which the exhaust flow passes through the soundproof plate 29, the exhaust flow directly passing through the soundproof plate 29 and the exhaust flow exhausted through the exhaust passage 31 formed by the sound absorbing material 28 and the exhaust filter 24 pass. The difference will be in the exhaust distance.

Therefore, by setting the length of the exhaust passage to a half wavelength of the noise to be silenced, the sound can be effectively silenced because of the same frequency due to the sound diffraction phenomenon, but with the phase shifted by 180 degrees. .

However, this method has a short wavelength (1 KHz).
Half wavelength = 17.5 cm) is effective for noise,
For the low frequency range, it seems impossible to do so due to the dimensions of the main body of the vacuum cleaner.

As described above, it is possible to provide an electric vacuum cleaner in which high-frequency N and NZ sounds, which are extremely unpleasant noises for the user, are particularly silenced.

[0025]

As described above, according to the present invention , by providing a space between the sound absorbing plate and the sound absorbing material, an exhaust passage is formed between the rear cover and the sound absorbing material and between the sound absorbing material and the sound insulating plate.
Exhaust energy phenomena due to buffering of the exhaust flow, and an increase in the sound absorbing effect by providing exhaust passages on both sides of the sound absorbing material can greatly reduce noise such as wind noise.

Further, the power efficiency can be increased by the phenomenon of the exhaust resistance caused by the increase of the exhaust passage, and the noise such as the wind noise can be reduced to provide a high-output vacuum cleaner.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a vacuum cleaner according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the vacuum cleaner according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a main part of the vacuum cleaner according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a vacuum cleaner shown as a reference example of the present invention.

FIG. 5 is a sectional view of a main part of the vacuum cleaner of the reference example .

FIG. 6 is a perspective view of a main part of the electric vacuum cleaner according to the reference example .

FIG. 7 is a sectional view of a main part of a conventional vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 4 Exhaust filter 5 Rear cover 6 Concave part 7 Exhaust hole 8 Sound absorbing material 9 Soundproof plate 10 Exhaust passage

Claims (1)

(57) [Claims] 1. A rear cover provided with an exhaust filter is provided at a rear side of a vacuum cleaner having a dust collecting chamber at a front side and a fan motor chamber at a rear side, and a concave part protruding inward is provided at the rear cover. An exhaust hole having a large opening communicating with the fan motor chamber at a bottom of the exhaust hole, and a sound absorbing material facing the exhaust hole and substantially perpendicular to an exhaust flow from the exhaust hole; A vacuum cleaner in which a soundproof plate is arranged behind a space through a space, and each of the spaces between the rear cover and the sound absorbing material and between the sound absorbing material and the soundproof plate is an exhaust passage.