JP3275527B2 - Blower silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for a blower, which is provided alone or incorporated in a blower or the like, has a ventilation passage in the center thereof, and is provided with a silencer made of a porous synthetic resin such as polyurethane.

[0002]

2. Description of the Related Art FIG. 6 is a front view showing a cross section of a main part of a conventional example, and FIG. 7 is a perspective view of the wire mesh shown in FIG. In the figure, a muffler 2 is incorporated in a discharge port 1c of a blower 1b such as a vortex blower driven by an electric motor 1a. The silencer 2
A tubular case 5 having a bottom 4 with an opening 3 at both ends is provided, and a silencer 7 made of a soft porous synthetic resin having a ventilation path 6 communicating with the opening 3 at the center is provided inside the case 5. A plurality of silencers 7 are laminated in the axial direction, and a cylindrical wire mesh 8 is provided in the ventilation passage 6 so that the ventilation passage 6 is not deformed by the dynamic pressure of the handling gas.

[0003]

Generally, a porous synthetic resin is formed as a block exceeding 1 m. Except for the six surrounding surfaces that are inappropriate for noise reduction performance,
Cut out into a plate about 100mm thick. This plate is punched by a press to obtain a sound deadening material 7 having a ventilation passage 6. This silencer 7 is fitted into a wire mesh 8 and laminated as in the prior art.
If the cross section has an appropriate dimension, the silencing performance of the silencing device 2 is improved as the length increases, and is about 100 to 1000 mm. However, the wire mesh 8 is rough and the fitting operation is difficult and time-consuming. Further, the silencer 7 is soft and friction is likely to occur between the adjacent silencers 7 due to friction with the wire mesh 8. It is well known that this gap leaks noise to the outside, and reduces the noise reduction performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a difficulty in laminating a sound-absorbing material made of a porous synthetic resin having a ventilation passage in the center.
It is an object of the present invention to provide a fan silencer capable of eliminating a decrease in silencing performance due to a gap.

[0005]

According to a first aspect of the present invention, there is provided a silencer for a blower, wherein a ventilation passage communicating with the opening is provided at the center inside a cylindrical case having a bottom with an opening at both ends. In the noise reduction device for a blower provided with a noise reduction material, the outside of the ventilation path of the noise reduction material stacked in the axial direction is skewered with an axial rod. At this time, a second aspect of the present invention is to fix the rod to a holding plate having a ventilation path at the center and having an outer shape in contact with the inside of the case, and a third aspect of the present invention is to bias the ventilation path of the adjacent sound deadening material. The continuous ventilation path is bent at different positions or different shapes.

According to a fourth aspect of the present invention, there is provided a blower silencer comprising a silencer made of a porous synthetic resin having a ventilation passage at the center and having a ventilation passage communicating with the opening inside a cylindrical case having a bottom with an opening at both ends. In the above silencer, the silencer is formed from one porous synthetic resin extending over both the bottoms. At this time, a fifth aspect of the present invention is to provide an axial slit extending from the outer shape of the sound deadening material to the ventilation path, and a sixth aspect of the invention is to provide a cylindrical wire mesh inside the ventilation path.

According to a seventh aspect of the present invention, there is provided a fan silencer comprising: a silencer made of a porous synthetic resin having a ventilation path at the center thereof and having a ventilation passage communicating with the opening inside a cylindrical case having a bottom with an opening at both ends. In the muffler of (1), a retaining projection which is continuous in the axial direction is formed on an inner wall of the cylindrical case, and a concave portion which the retaining projection cuts into the laminated muffler is formed.

[0008]

According to the first aspect of the present invention, since the skewer is skewered with a stick without using a rough wire mesh, it is possible to eliminate the difficulty of laminating a sound deadening material made of a porous synthetic resin having a ventilation path in the center. In addition, since there is no friction with the wire mesh, no gap is generated between the adjacent silencing materials, and a decrease in the silencing performance can be eliminated. And, the fluid loss of the wire mesh is eliminated. At this time, according to the second aspect, the holding plate whose position is ensured with respect to the case surely holds the mutual positional relationship of the plurality of rods, thereby simplifying the skewering, and according to the third aspect, the bent ventilation path Further reduces noise.

According to the fourth aspect of the present invention, the number of the muffling materials is one over the entire length of the case, and the laminating operation itself can be eliminated. In addition, since the layers are not stacked, a gap between adjacent noise reduction materials does not originally exist, and a reduction in noise reduction performance can be eliminated. At this time, according to the fifth aspect, the outer shape of the silencer and the ventilation path can be continuously formed by the slits, and according to the sixth aspect, the silencer has no risk of being deformed by the dynamic pressure of the handling gas by the wire mesh. And the installation of the wire net is easy by the slit.

According to the seventh aspect of the present invention, the overall shape of the laminated silencer is ensured by the retaining projections of the cylindrical case biting into the recesses of the silencer.

[0011]

1 is a sectional view of the first embodiment, FIG. 2 is an assembled perspective view of the sound deadening material of FIG. 1, FIG. 3 is a sectional view of the second embodiment, and FIG. 4 is a sectional view of the third embodiment. 5 is an assembled perspective view of the sound deadening material of the fourth embodiment, FIG. 8 is an assembled perspective view of the sound deadening material of the fifth embodiment, and FIG. 9 is a partial left side view of FIG. In the conventional example and each drawing, the components denoted by the same reference numerals have approximately the same functions, and redundant description may be omitted.

Referring to FIGS. 1 and 2, the silencer 10 comprises:
A tubular case 5 having a bottom 4 with an opening 3 at both ends is provided, and a silencer 11 made of a soft porous synthetic resin having a ventilation path 6 communicating with the opening 3 at the center is provided inside the case 5. As a feature of the embodiment, a plurality of sound deadening materials 11 are laminated in the axial direction, and the sound deadening material 11 has a hole 12 formed outside the ventilation passage 6 so that the ventilation passage 6 is not deformed by the dynamic pressure of the handling gas. It is skewered at 13. Then, if the rod 13 is fixed to the holding plate 14 having the outer shape that is in contact with the inside of the case 5 with the ventilation path 6 at the center, the workability is good in small-quantity production. In addition, in the case of mass production, if a jig is used, the soft silencer 11 can be skewered with the plurality of rods 13 without using the holes 12 and the holding plate 14.

In the second embodiment shown in FIG. 3 or the third embodiment shown in FIG.
The continuous ventilation paths 24 or 34 are bent by making the ventilation paths 24 or 34 of 2 and 33 eccentric or having different shapes.
The rod 13 is also used here. It is well known that a bent ventilation path has good sound deadening performance. Examples 1 and 2
Or 3 according to 3 without using a rough wire mesh
Since skewering is performed in step 3, it is possible to eliminate the difficulty of laminating the sound deadening material made of porous synthetic resin having a ventilation path in the center.
In addition, since there is no friction with the wire mesh and friction with the rod 13 is small, no gap is generated between adjacent silencing materials, and a decrease in silencing performance can be eliminated. And, the fluid loss of the wire mesh is eliminated.

In the embodiment 4 shown in FIG. 5, the case is not shown, but is the same as the cylindrical case 5 having the bottom with the opening at both ends shown in FIG. 1, FIG. 3 or FIG. Inside such a case, a sound deadening material 42 having a ventilation path 41 communicating with the opening at the center and made of a porous synthetic resin is formed of one porous synthetic resin extending over both bottoms. Such a long silencer 42 can be formed of a vibrating blade that is arranged in the axial direction and vibrates in the axial direction. If the movement of the oscillating blade is controlled by NC, both the outer shape 43 of the sound deadening material 42 and the ventilation path 41 are formed quickly.
At this time, if an axial slit 44 following the ventilation path 41 from the outer shape 43 of the sound deadening material 42 is provided, the outer shape 43 and the ventilation path 4
1 can be formed continuously, or the ventilation path 41 can be independently formed without the slit 44 after a vibrating blade is inserted by piercing a narrow hole in the center of the ventilation path 41 with a laser beam. If the cross-sectional area is small in proportion to the length of the silencing material 42 and there is a risk of deformation due to the dynamic pressure of the handling gas, a cylindrical wire mesh 44
It is good to decorate. At this time, if the slit 44 is provided, the work of mounting the wire netting 45 is simplified, and the slit 44 may be wavy in the radial direction. Also, instead of the wire mesh 45, the rod 13
May be used.

According to the fourth embodiment, the ventilation passage 4 is provided at the center.
1, the operation of laminating the sound deadening material 42 made of a porous synthetic resin can be eliminated. In addition, since the layers are not stacked, a gap between adjacent noise reduction materials does not originally exist, and a reduction in noise reduction performance can be eliminated. 8 and 9, a retaining projection 52 is formed on the inner wall of the cylindrical case 5 so as to be continuous in the axial direction.
2 forms a recess into which the hole 2 bites. According to the fifth embodiment, the retaining shape 52 of the cylindrical case 5 bites into the concave portion of the sound deadening material 51 to secure the overall shape of the stacked sound deadening material 51. The retaining projection 52 has a dovetail shape, a T shape, a Christmas tree shape, or the like as shown in the figure.

[0016]

According to the silencer of the blower according to the first aspect of the present invention, since the skewer is skewered with a stick, there is an effect that the operation of laminating the silencer is simple, and there is no friction with the wire mesh. There is an effect that no gap is generated between the metal meshes, a decrease in the noise reduction performance can be eliminated, and there is no fluid loss in the wire mesh. Invention 2
According to the third aspect, the mutual positional relationship of the plurality of rods is reliably held by the holding plate, and the skewering is simplified. According to the third aspect, the bent ventilation path has an effect of further reducing noise.

According to the fan silencer of the fourth aspect, the silencer has only one silencer over the entire length of the case, so that there is an effect that the lamination operation itself can be eliminated. Further, since there is no lamination, the gap between adjacent silencers is reduced. There is an effect that it is not inherently present, and that a decrease in the noise reduction performance can be eliminated. According to the fifth aspect, the outer shape of the silencer and the formation of the ventilation path can be continuously formed by the slits. According to the sixth aspect, the silencer is completely prevented from being deformed by the dynamic pressure of the handling gas by the wire mesh. There is an effect that the installation of the wire mesh is easy.

According to the seventh aspect, since the retaining projections of the cylindrical case bite into the concave portions of the silencing material to secure the overall shape of the laminated silencing material, there is an effect that the operation of laminating the silencing material is simple. Further, since there is no friction with the wire mesh, no gap is generated between the adjacent sound deadening materials, and a reduction in the sound deadening performance can be eliminated, and there is an effect that there is no fluid loss in the wire mesh.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment.

FIG. 2 is an assembled perspective view of the sound deadening material of FIG. 1;

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a sectional view of a third embodiment.

FIG. 5 is an assembled perspective view of a sound deadening material according to a fourth embodiment.

FIG. 6 is a front view showing a cross section of a main part of a conventional example.

FIG. 7 is a perspective view of the wire mesh of FIG. 6;

FIG. 8 is an assembled perspective view of a sound deadening material according to a fifth embodiment.

9 is a partial left side view of FIG.

[Explanation of symbols]

Reference Signs List 3 opening 4 bottom 5 case 6 ventilation passage 10 silencer 11 silencer 12 hole 13 rod 14 holding plate 21 silencer 22 silencer 24 ventilation passage 31 silencer 32 silencer 33 silencer 34 ventilation passage 41 silencer 42 silencer Outline 44 Slit 45 Wire mesh 51 Sound-absorbing material 52 Retaining projection

Claims (7)

(57) [Claims] 1. A silencing device for a blower, comprising a silencing member made of a porous synthetic resin having a ventilation passage in the center at the center thereof and having a ventilation passage communicating with the opening inside a cylindrical case having a bottom with an opening at both ends. The outside of the ventilation path of the silencing material laminated on the skewer is skewered with an axial rod. 2. A muffler for a blower according to claim 1, wherein said rod is fixed to a holding plate having a ventilation passage at a center portion and having an outer shape in contact with an inside of said case. . 3. The blower silencing device according to claim 1, wherein the continuous ventilation passages are bent by making the ventilation passages of the adjacent silencing material deviate or have different shapes. Silencer. 4. A muffler for a blower, comprising: a muffler made of a porous synthetic resin having a ventilation passage in the center of a ventilation case communicating with the opening inside a cylindrical case having a bottom with an opening at both ends. A sound deadening device for a blower, characterized in that a material is formed from one porous synthetic resin covering both said bottoms. 5. The silencing device for a blower according to claim 4, wherein an axial slit extending from the outer shape of the silencing material to the ventilation passage is provided. 6. The silencing device for a blower according to claim 4, wherein a cylindrical wire mesh is provided in the ventilation passage. 7. A silencing device for a blower, comprising a silencing member made of a porous synthetic resin and having a ventilation passage communicating with said opening at the center inside a tubular case having a bottom with an opening at both ends. A silencing device for an air blower, comprising: a retaining projection formed in the inner wall of a case; and a retaining projection that is continuous in the axial direction;