JPS6232930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a soundproofing material attached to an electric blower of a vacuum cleaner.

Conventional technology Conventionally, as a secondary means of reducing the noise of vacuum cleaners, sound-absorbing material was wrapped around the outer circumference of the bracket of an electric blower (Japanese Utility Model Publication No. 53-24161), or
There was one in which a sound insulating plate such as a fiber sheet or a steel plate was wrapped around the outside of the sound absorbing material (Japanese Utility Model Publication No. 52-95910).

Problems to be Solved by the Invention However, the former sound absorbing material alone did not provide a sufficient noise reduction effect. The latter method has a quiet effect, but it takes time and effort to assemble the soundproofing material, resulting in poor productivity and high costs. Furthermore, the sound insulating plate was misaligned when incorporated into a vacuum cleaner, making assembly difficult, and the misalignment increased noise and reduced the suction performance of the vacuum cleaner, resulting in unstable quality.

Therefore, the present invention solves the above-mentioned conventional drawbacks, and aims at improving productivity as a soundproofing material, making vacuum cleaners quieter, and stabilizing quality.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention has the following features:
A rectangular parallelepiped-shaped breathable sound-absorbing material made of spongy flame-retardant polyurethane foam is provided with a notch that penetrates from one side to the opposite side and is not separated on both end faces, and furthermore, no penetration is made on either side of the notch. A notch is provided, and an impermeable sound insulation board is attached to each of the notches on both sides.
The cut through the sound absorbing material is widened and arranged at intervals around the outer circumference of the bracket, and both ends are sandwiched between the rear of the fan case of the electric blower and a support wall that supports the rear of the electric blower, and the part where the sound insulation plate is attached is This is opposed to the exhaust direction of the exhaust port of the bracket.

Effects According to the present invention, the sound absorbing effect of the sound absorbing material made of flame-retardant polyurethane foam and the sound insulating effect of the sound insulating plate ensure a quiet vacuum cleaner. It can be handled as a so-called unit body, which can be handled as a so-called unit body, and the workability can be improved accordingly.

Example Examples thereof will be described below with reference to the drawings.

In the figure, 1 is a main body of a vacuum cleaner incorporating an electric blower 2 and a cord winding device 3, and 4 is a removable dust collection box disposed at the front of the vacuum cleaner.

5 is a rear moving wheel attached to the main body 1, and 6 is a front wheel rotatably attached to the lower part of the dust collection box 4.

7 is a front support rubber that supports the electric blower 2, and 8 is a rear support rubber.

The exterior of the electric blower 2 is composed of a fan case 9 and a bracket 10, and the bracket 10 has an exhaust port 11 on its circumferential surface.

Reference numeral 12 denotes a soundproofing material, which is incorporated so as to cover the outer periphery of the bracket 10 at intervals, and one end of which abuts against the fan case 9, and the other end of which abuts against and is held in place by the support wall 13 of the electric blower 2. This soundproof material 12 rectifies the wind flowing out from the exhaust port 11 to reduce the sound of the wind flowing, and also serves as a sound absorber, thereby reducing the sound generated from the electric blower 2.

The sound insulating material 12 is composed of a breathable sound absorbing material 12' made of a spongy flame-retardant polyurethane foam and an impermeable sound insulating plate 16 to be described later. The sound absorbing material 12' has a substantially rectangular parallelepiped shape, and a notch 14 penetrating through the opposite surface is provided at approximately the center of the thickness of each surface so that when both longitudinal surfaces are compressed, the sound absorbing material 12' becomes substantially circular. Moreover, both ends of this notch 14 are not cut off as much as possible so that they can be formed into a substantially circular shape.

The sound-absorbing material 12' is divided into two by the cut 14, and a similar cut 15 is made to divide each half into two, without penetrating to the opposite side.The two cuts 15 are filled with fibers, vinyl chloride plates, iron plates, etc. A sound insulating plate 16 made of

This sound insulating plate 16 is held by sound absorbing material 12 on three sides, and the other side is held against the support wall 13 to prevent it from coming off even if it is brought into contact with the support wall 13 when it is assembled into a vacuum cleaner. This eliminates the need for special fixing means.

Furthermore, the fan case 9 can also be used by changing the direction in which the soundproofing material 12 is assembled.

Further, the sound insulating plate 16 is assembled so as to face the exhaust direction of the exhaust port 11 disposed on the outer periphery of the bracket 10 of the electric blower 2. That is, when the sound-absorbing material 12' is formed into a substantially circular shape, both surfaces that are compressed are positioned away from the exhaust direction of the exhaust port 11, thereby shielding the sound coming from the exhaust port 11 and blocking the flow of exhaust gas. It is turned to attenuate the sound and reduce noise.

Effects of the Invention As described above, the present invention can form a sound insulating material by making cuts in a single sound absorbing block material, has a small number of parts, is extremely easy to process, and significantly improves productivity, so it is inexpensive. Can be supplied.

In addition, the quality is stable because the sound insulating plate does not shift during assembly and the noise effect does not vary.

Furthermore, as a means of reducing noise, we can change the position of the notch that divides the sound-absorbing material into two, making the side where the sound is louder thicker, or easily convert the sound-insulating material to a different material or thickness. Noise reduction can be easily studied, and the effect of noise reduction can be increased by easily arranging the sound insulating plate to face the exhaust direction of the exhaust port of the electric blower.

[Brief explanation of the drawing]

Fig. 1 is a cutaway sectional view of essential parts of a vacuum cleaner showing an embodiment of the present invention, Fig. 2 is a perspective view of a soundproofing material, Fig. 3 is a sectional view of the same, Fig. 4 is an exploded perspective view of the same, and Fig. FIG. 5 is a processing explanatory diagram. 2...Electric blower, 9...Fan case, 10...Bracket, 11...Exhaust port, 12...Soundproofing material, 12'
...Sound absorbing material, 13...Support wall, 14, 15...Notch, 16...Sound insulating board.

Claims (1)

[Claims] 1. In the soundproofing material wrapped around the outer circumference of the bracket of an electric blower, the sound-absorbing material is made of spongy flame-retardant polyurethane foam and penetrates from one side to the opposite side, and both ends are separated. Furthermore, a notch that does not penetrate the bracket is provided on both sides of the notch, and an impermeable sound insulating plate is attached to each of the notches on both sides. It is characterized in that both ends are sandwiched between the rear of the fan case of the electric blower and a support wall that supports the rear of the electric blower, and the part to which the sound insulation plate is attached faces the exhaust direction of the exhaust port of the bracket. Soundproofing material for vacuum cleaners.