JPS6124935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soundproofing material attached to an electric blower of a vacuum cleaner, and its purpose is to improve the workability and productivity of the soundproofing material and to reduce the noise of the vacuum cleaner. It is something to do.

Conventionally, as a secondary means of reducing the noise of vacuum cleaners, a preventive material has been wrapped around the outer periphery of the bracket of an electric blower by wrapping the bracket. As shown in , B, a flat soundproof plate a having a length that can surround the bracket of an electric blower is formed into a cylindrical shape by butting both end surfaces together, and a separate soundproofing plate is used to further improve the noise prevention effect. A plate a is superimposed on the soundproofing material and curved into the same cylindrical shape, and the abutting portions are fixed with tape b or a fixing device c such as a needle to prevent misalignment of the overlap.

However, such soundproofing materials require time and effort to assemble, resulting in poor productivity and high costs.Furthermore, the finished product is cylindrical, making it bulky and difficult to transport or transport. It is inconvenient to handle, and furthermore, since the stacked soundproof plates a and a' are in close contact with each other, the noise prevention effect is reduced.

The present invention eliminates these drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In Fig. 3, 1 is a rectangular plate-shaped or approximately rectangular parallelepiped sound-insulating material main body made of a sound-insulating material such as a spongy flame-retardant polyurethane foam composed of single cells, and having an appropriate thickness, and both ends of the sound-insulating material in the longitudinal direction. Part 2, 2
A straight line 3 is cut in the length direction so as to pass through the center of both sides (upper and lower surfaces in the figure), that is, the center of the thickness, leaving an appropriate dimension, thereby forming divided joint surfaces 3a and 3b that are close to each other. Furthermore, on both sides of the dividing joint surfaces 3a, 3b formed by the notches, substantially the same dimensions as the aforementioned dimensions are left at both ends 2, 2 in the length direction of the soundproofing material main body 1. Non-linear cuts 4, 5 such as wavy or serrated cuts are provided in parallel with the linear cuts 3 and penetrated between both side surfaces to form divided engagement surfaces 4a, 4b, 5a, 5b that are in close contact with each other. They are formed by forming each of them.

The non-linear cuts 4 and 5 forming the divided engagement surfaces 4a, 4b, 5a, and 5b are provided so as to further divide the soundproofing material main body 1, whose thickness has been divided into two by the linear cuts 3, into two. Moreover, these notches 3, 4, and 5 are all formed in a length that can be attached to a bracket of an electric blower, which will be described later.

Fig. 2 shows a vacuum cleaner equipped with the soundproofing material A constructed in this way. 6 is the vacuum cleaner main body which houses an electric blower 7 and a cord winding device 8, and a dust collector is installed in the front part of the vacuum cleaner. A box 9 is detachably attached. Reference numeral 10 indicates a rear moving wheel attached to the lower surface of the main body 6, and 11 indicates a front wheel rotatably attached to the lower surface of the dust collection box 9.

Reference numerals 12 and 13 denote front support rubber and rear support rubber that support the front and rear parts of the electric blower 7, respectively.

The outer shell of the electric blower 7 is composed of a fan case 14 and a bracket 15, and an exhaust port 16 is provided on the circumferential surface of the bracket 15.

The bracket 1 is attached to the outer periphery of this bracket 15.
The soundproofing material A is incorporated so as to surround 5, and the method of incorporating it is as follows.

That is, by separating the notch 3 at the center of the soundproof material main body 1 shown in FIG. 3 having the above-described structure and separating the split joint surfaces 3a and 3b, the soundproof material main body 1 shown in FIG. After forming it into a cylindrical shape, it is arranged so as to bend around the outer periphery of the bracket 15 of the electric blower 7, one end surface thereof is brought into contact with the end surface of the fan case 14, and the other end surface is brought into contact with the support wall 18 of the electric blower 7. Support it in contact with.

When the main body 1 of the soundproofing material is elastically deformed into a cylindrical shape by being pulled away from the central notch 3, the inner thickness is There is a difference in the radius of curvature between the part and the outer thickness part, so that the divided engagement surfaces 4a and 4b and 5a and 5b, which are wave-shaped or serrated, slide in a staggered manner, respectively, resulting in these divided engagement surfaces. A gap 17 is created between surfaces 4a and 4b and between 5a and 5b, and an air layer is formed by this gap 17.

Therefore, this soundproofing material A rectifies the wind flowing out from the exhaust port 16 of the electric blower 7 to reduce the sound of the flow of the wind, and also acts as a sound absorber, thereby reducing the sound generated from the electric blower 7. be.

As described above, the present invention provides a rectangular plate-like or substantially rectangular parallelepiped soundproofing material main body made of a soundproofing material such as polyurethane foam and having an appropriate thickness, with the center part of both sides leaving both ends in the length direction. A split joining surface is formed by cutting linearly in the length direction, and a non-linear split engaging surface such as wavy or serrated is formed on both sides by leaving both ends in the length direction on both sides of the split joining surface. This relates to the soundproofing material for vacuum cleaners, which is formed by cutting in the lengthwise direction, so it is manufactured by simply making cuts in the main body of the soundproofing material, which is rectangular plate-shaped or approximately rectangular parallelepiped, so it is easy to work with. Productivity is improved, it can be supplied at low cost, and since it is in the form of a plate or a substantially rectangular parallelepiped until it is assembled into a vacuum cleaner, transportation and other handling are easy. By simply forming it into a cylindrical shape, it becomes a soundproofing material that can be easily attached to the outer circumference of the bracket of an electric blower.Not only is it easy to assemble, but since there are no seams, it can reliably prevent sound leakage, and it can be used for a long time. It is something that can be put to use.

In addition, when the soundproofing material of the present invention is formed into a cylindrical shape, the non-linear split engagement surfaces such as wavy or sawtooth shapes are shifted from each other due to the difference in the radius of curvature between the inside and outside, which creates an air layer. The sound from an electric blower or the like is propagated through the inner layer mainly made of soundproofing material, the air layer, and the outer layer mainly made of soundproofing material.
Sound energy is attenuated within each of these layers, providing a so-called soundproofing effect. However, the energy attenuation effect of sound is noticeable when it propagates between layers with different densities. When sound is propagated to the outer layer mainly made of soundproofing materials of different types, the energy of the sound is significantly attenuated, making it possible to further enhance the soundproofing effect as a whole.

Moreover, as mentioned above, when forming an air layer mainly in the soundproofing material, only a cut is formed in the soundproofing material, so the structure and production are extremely simple, and there is no high cost. be.

Furthermore, it is also possible to form the main body of the soundproofing material into a cylindrical shape and attach it to an electric blower by separating one of the divided joint surfaces, instead of using the divided joint surfaces, and attaching it to the electric blower. Since the thicker portion can be located in the direction where the loudest noise is generated, effective soundproofing measures can be taken.

[Brief explanation of the drawing]

1A and 1B are a perspective view and a sectional view of a conventional soundproofing material, FIG. 2 is a cutaway sectional view of a main part of a vacuum cleaner equipped with a soundproofing material according to an embodiment of the present invention, and FIG. FIG. 4 is a perspective view of the soundproofing material according to an embodiment, FIG. 4 is a perspective view of the soundproofing material formed into a substantially cylindrical shape, and FIG. 5 is a sectional view thereof. 1 is the soundproofing material main body, 2, 2 are both ends, 3 is a linear cut, 4, 5 is a non-linear cut, 3a, 3
b is a divided joint surface, and 4a, 4b, 5a, and 5b are divided engagement surfaces.

Claims (1)

[Scope of Claims] 1. A rectangular plate-shaped or substantially rectangular parallelepiped soundproofing material main body made of a soundproofing material such as polyurethane foam and having an appropriate thickness, with the length extending between the center portions of both sides, leaving both ends in the length direction. A split joining surface is formed by cutting in the horizontal direction, and a non-linear split engaging surface such as a wavy or sawtooth shape is formed between both sides, leaving both ends in the length direction on both sides of the split joining surface. A soundproofing material for a vacuum cleaner, characterized by having a notch formed in the lengthwise direction. 2. Both the split joint surface and the engaging joint surface,
Claim 1 characterized in that it is formed in a size that can be attached to the outer periphery of a bracket of an electric blower.
Soundproofing material for vacuum cleaners as described in section.