JPH04319323A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To provide a vacuum cleaner with less exhausting noise such as a whistling sound of exhaust air flow and a vibrating sound included in exhaust air. CONSTITUTION:The rear cover 5 of a cleaner body 1 has a recessed part 6 and an exhaust hole 7 having a large diameter is provided on its bottom surface. A sound insulating plate 9 having a sound absorbing material 8, which is opposed to the exhaust hole 7 within the recessed part and situated nearly at a right angle to the exhaust air flow passing the exhaust hole 7 and has a plurality of irregular surfaces 10, is disposed, and an exhaust passage is formed between the inner surface of the recessed part 6 and the sound isolating plate 9. Thus, the sound absorbing area is extended by the plurality of irregular surfaces 10 to absorb the vibrating sound of the exhaust flow much more and the energy of the exhaust flow collided with the irregular surfaces 10 is damped.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner with reduced exhaust noise.

0002

2. Description of the Related Art Generally, as shown in FIG.
2 is provided. Rear cover 2
3 is provided with a plurality of lattice-shaped ribs 24 for fixing and protecting the exhaust filter 22, and the exhaust gas is discharged by passing between the ribs 24. Furthermore, as shown in FIG. 4, some sound insulating plates 26 equipped with a flat sound absorbing material 25 are arranged at a position facing the rearward exhaust flow.

0003

[Problems to be Solved by the Invention] However, in the configuration of the conventional vacuum cleaner described above, the wind noise of the exhaust flow due to the lattice-shaped ribs 24 provided in the exhaust section and the vibration noise of the fan motor contained in the exhaust gas are Since the exhaust gas is emitted as it is outside the cleaner body 21, it has the disadvantage that the exhaust noise is large. Furthermore, even those provided with sound insulating plates 26 have limitations in sound absorption and sound insulation, and have limitations in terms of promoting noise reduction.

The present invention solves the above problems and aims to provide a vacuum cleaner with low exhaust noise.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the vacuum cleaner of the present invention is provided with a recess in the rear cover, a large diameter exhaust hole in the bottom of the recess, and an exhaust hole in the recess. A sound insulating plate is provided facing the hole and positioned substantially perpendicular to the exhaust flow passing through the exhaust hole, a sound absorbing material formed of a plurality of uneven surfaces is disposed on the inner surface of the sound insulating plate, and the recessed portion An exhaust passage is formed between the inner surface of the soundproof plate and the soundproof plate.

[0006]

[Function] With the above-described structure, the sound-absorbing area of the present invention is expanded by the plurality of uneven surfaces formed on the surface of the sound-absorbing material, so more of the vibration sound of the exhaust flow is absorbed. Since the reflected flow of the exhaust gas collides with the uneven surface and buffers the exhaust flow, the energy of the exhaust flow passing through the exhaust passage can be attenuated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in Fig. 1, a dust collection chamber 2 is provided at the front of the vacuum cleaner body 1, and a fan motor chamber 3 is provided at the rear. It has a rear cover 5 equipped with an exhaust filter 4 that performs the following. As shown in FIG. 2, the rear cover 5
A recess 6 is formed at the rear end of the recess 6, and a large diameter exhaust hole 7 is provided on the inner surface of the recess 6. Further, a soundproof plate 9 is disposed above the exhaust hole 7 in the recess 6 so as to face the exhaust hole 7 and to be located approximately at right angles to the exhaust flow passing through the exhaust hole 7. The sound-absorbing material 8 has a plurality of uneven surfaces 10 formed on the inner surface of the sound-insulating plate 9, and the exhaust flow passing through the exhaust hole 7 is temporarily blocked by the sound-absorbing material 8. An exhaust passage 11 is formed between the two and the exhaust flow is made to flow in the direction of arrow a.

As described above, by providing the rear cover 5 with the large diameter exhaust hole 7 and the sound insulating plate 9 having the sound absorbing material 8 having a plurality of uneven surfaces 10 facing the exhaust hole 7, the exhaust filter -4 is protected by the soundproof plate 9, so there is no need for lattice-like ribs, and the exhaust flow is controlled by the large-diameter exhaust hole 7.
This reduces the amount of wind noise generated in that area. Furthermore, when the exhaust flow collides with the sound absorbing material 8,
Since the surface of the sound absorbing material 8 is formed with a plurality of uneven surfaces 10, the sound absorbing area is expanded and more sound can be absorbed. Since the reflected flow and the exhaust flow discharged from the exhaust hole 7 buffer each other, the energy of the exhaust flow exiting from the exhaust passage 11 is attenuated, making it possible to further reduce exhaust noise.

[0009]

As described above, according to the present invention, the plurality of uneven surfaces formed on the surface of the sound absorbing material absorbs and attenuates more of the wind noise and vibration noise contained in the exhaust flow, resulting in less exhaust noise. A vacuum cleaner can be provided.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a vacuum cleaner according to an embodiment of the present invention.

[
Figure 2: Enlarged sectional view of main parts of the vacuum cleaner

[Figure 3] Partial cross-sectional view of a conventional vacuum cleaner

[Fig. 4] Partial sectional view of another conventional vacuum cleaner

[Explanation of symbols]

1 Vacuum cleaner body 2 Dust collection room 3 Fan motor room 4 Exhaust filter 5 Rear cover 6 Recess 7 Exhaust hole 8 Sound absorbing material 9 Soundproof board 10 Uneven surface 11 Exhaust passage

Claims (1)

[Claims] Claim 1: A vacuum cleaner body having a dust collection chamber at the front and a fan motor chamber at the rear; a rear cover provided with an exhaust filter at the rear of the vacuum cleaner; a recess provided in the rear cover; A large-diameter exhaust hole is provided, and a soundproof plate is provided within the recess so as to face the exhaust hole and to be located approximately perpendicular to the exhaust flow passing through the exhaust hole, and a plurality of soundproof plates are provided on the inner surface of the soundproof plate. A vacuum cleaner is provided with a sound absorbing material formed of an uneven surface, and an exhaust passage is formed between the inner surface of the recess and the sound insulating plate.