JPH0742699A - Muffler device for blower - Google Patents

Abstract

PURPOSE:To eliminate the difficulty of laminating work of muffling material formed of porous synthetic resin having a ventilation flue at the center part and the lowering of muffling performance caused by a clearance. CONSTITUTION:A muffler 10 is provided with a cylindrical case 5 having bottom parts 4 with openings 3 at both ends, and a muffling material 11 formed of soft, porous synthetic resin having a ventilation flue 6, communicated with the opening 3, at the center part. The muffling material 11 is plurally laminated in the axial direction. In order to prevent the deformation of the ventilation flue 6 caused by the dynamic pressure of gas in use, the hole 12 outside of the ventilation flue 6 in the muffling material 11 is spitted by an axial rod 13, and the rod 13 is rigidly fixed to a holding plate 14 having the ventilation flue 6 at the center part and having the outer shape coming in contact with the inside of the case 5.

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 and has a silencer made of a porous synthetic resin such as polyurethane having a ventilation passage in its central portion.

[0002]

2. Description of the Related Art FIG. 6 is a front view showing a cross-sectional view 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 silencer 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 cylindrical case 5 having a bottom 4 with an opening 3 at both ends is provided, and a sound deadening material 7 made of a soft porous synthetic resin having an air passage 6 communicating with the opening 3 at the center is provided inside thereof. A plurality of sound deadening materials 7 are laminated in the axial direction, and a tubular wire net 8 is provided in the ventilation passage 6 so that the ventilation passage 6 is not deformed by the dynamic pressure of the handled gas.

[0003]

Generally, a porous synthetic resin is formed as a block exceeding 1 m. 30 ~ from the block except for the surrounding 6 surfaces
Cut out into a plate having a thickness of about 100 mm. This plate is punched by a press to obtain a sound deadening material 7 having an air passage 6. The sound deadening material 7 is fitted into the wire mesh 8 and laminated as in the conventional example.
If the cross section has an appropriate size, the muffling performance of the muffling device 2 improves as the length increases, and is about 100 to 1000 mm. However, the wire netting 8 is rough and the fitting work is difficult, which requires time. Further, since the sound deadening material 7 is soft and rubs against the wire netting 8, a gap is likely to occur between the adjacent sound deadening materials 7. It is well known that this gap leaks noise to the outside, which reduces the silencing performance.

The object of the present invention is to make it difficult to stack a sound deadening material having a ventilation passage in the center and made of a porous synthetic resin,
An object of the present invention is to provide a muffling device for a blower that can eliminate deterioration in muffling performance due to a gap.

[0005]

According to another aspect of the present invention, there is provided a silencer for a blower, which is made of a porous synthetic resin having an air passage communicating with the opening inside a cylindrical case having a bottom with an opening at both ends. In a muffler of a blower including the following sound deadening material, the outside of the ventilation passage of the sound deadening material laminated in the axial direction is skewered with an axial rod. At this time, Invention 2 is to fix the rod to a holding plate having an air passage in the center and having an outer shape in contact with the inside of the case, and Invention 3 is to dispose the air passage of the adjacent sound deadening member in a biased manner. The ventilation passages are formed in different positions or have different shapes, and the continuous ventilation passages are bent.

A silencer for a blower according to a fourth aspect of the present invention is a blower including a silencer made of a porous synthetic resin, having a ventilation passage communicating with the opening at the center, inside a cylindrical case having a bottom with an opening at both ends. In the sound deadening device, the sound deadening material is formed of a single porous synthetic resin covering the both bottoms. At this time, a fifth aspect of the invention is to provide an axial slit continuing from the outer shape of the sound deadening material to the air passage, and a sixth aspect is to provide a tubular wire net in the air passage.

A muffler for a blower according to a seventh aspect of the present invention is a blower comprising a cylindrical case having a bottom with an opening at both ends, and a silencer made of a porous synthetic resin having a ventilation path communicating with the opening in the center. In the sound deadening device described above, a retaining protrusion that is continuous in the axial direction is formed on the inner wall of the cylindrical case, and a recess is formed in the laminated sound deadening material that the retaining protrusion bites into.

[0008]

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

According to the invention 4, the number of the sound deadening material is one over the entire length of the case, and the laminating operation itself can be eliminated. In addition, since they are not laminated, there is essentially no gap between the adjacent sound deadening materials, and the deterioration of the sound deadening performance can be eliminated. At this time, according to the invention 5, the outer shape of the sound deadening material and the ventilation passage can be continuously formed by the slit, and according to the invention 6, the sound deadening material has no fear of being deformed by the dynamic pressure of the gas handled by the wire mesh. However, the slits make it easy to attach the wire mesh.

According to the seventh aspect of the present invention, the retaining protrusion of the cylindrical case bites into the recess of the sound deadening material to secure the entire shape of the laminated sound deadening material.

[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 in each drawing, those denoted by the same reference numerals have approximately the same function, and duplicate explanation may be omitted.

In FIGS. 1 and 2, the muffling device 10 is
A cylindrical 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 an air passage 6 communicating with the opening 3 at the center is provided inside thereof. A feature of the embodiment is that a plurality of sound deadening materials 11 are stacked in the axial direction, and the sound deadening material 11 has a hole 12 on the outer side of the airflow path 6 in the axial direction so that the air flow path 6 is not deformed by the dynamic pressure of the handled gas. It is skewered at 13. Then, if the rod 13 is fixed to the holding plate 14 having the outer shape that has the ventilation passage 6 at the center and is in contact with the inside of the case 5, workability is good at the time of small-quantity production. Further, in the case of mass production, if a jig is used, the soft sound deadening material 11 can be skewered with a plurality of rods 13 without using the hole 12 and the holding plate 14.

In the second embodiment shown in FIG. 3 or the third embodiment shown in FIG. 4, adjacent sound deadening materials 21 and 22 or 31, 3 are provided.
The ventilation passages 24 or 34 of 2 and 33 are deviated or made into a different shape to bend the continuous ventilation passages 24 or 34.
The bar 13 is also used here. It is well known that a curved ventilation passage has good sound deadening performance. Examples 1 and 2
Or according to 3, the rod 1 without the use of rough wire mesh
Since it is skewered at 3, it is possible to eliminate the difficulty of stacking the sound deadening material made of porous synthetic resin with an air passage in the center.
Further, since there is no friction with the wire mesh and a small friction with the rod 13, no gap is generated between the adjacent sound deadening materials, and the deterioration of the sound deadening performance can be eliminated. And the fluid loss of the wire mesh is eliminated.

In Embodiment 4 shown in FIG. 5, the case is not shown, but is the same as the cylindrical case 5 having the bottom with an 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 from one porous synthetic resin covering both the bottoms. Such a long silencing material 42 can be formed by a vibrating blade that is arranged in the axial direction and vibrates in the axial direction. If the movement of the vibrating blade is NC controlled, the outer shape 43 of the sound deadening member 42 and the ventilation passage 41 are formed quickly.
At this time, if an axial slit 44 is provided from the outer shape 43 of the sound deadening member 42 to the air passage 41, the outer shape 43 and the air passage 4 can be formed.
1 can be continuously formed, or a thin hole can be formed in the center of the ventilation path 41 by a laser beam to insert a vibrating blade, and then the ventilation path 41 can be independently formed without the slit 44. If the cross-sectional area is small relative to the length of the sound deadening material 42 and there is a risk of deformation due to the dynamic pressure of the handling gas, a tubular wire net 44 may be provided in the ventilation passage 42.
It is good to decorate. At this time, if the slit 44 is provided, the work of attaching the wire net 45 is simplified, and the slit 44 may be waved in the radial direction. Also, instead of the wire net 45, the rod 13
May be used.

According to the fourth embodiment, the ventilation passage 4 is provided at the center.
It is possible to eliminate the work of laminating the sound deadening material 42 having No. 1 and made of porous synthetic resin. In addition, since they are not laminated, there is essentially no gap between the adjacent sound deadening materials, and the deterioration of the sound deadening performance can be eliminated. In Example 5 shown in FIG. 8 and FIG. 9, a retaining protrusion 52 that is continuous in the axial direction is formed on the inner wall of the tubular case 5, and the retaining protrusion 5 is attached to the laminated sound deadening material 51.
2 forms a recess that bites into. According to the fifth embodiment, the retaining protrusions 52 of the tubular case 5 bite into the recesses of the sound deadening material 51 to ensure the overall shape of the laminated sound deadening material 51. The retaining projection 52 has a dovetail shape, a T-shape, a Christmas tree shape, etc., as shown in the figure.

[0016]

According to the muffler of the blower of the first aspect of the invention, there is an effect that the sound deadening material is easily laminated because it is skewered by a stick, and there is no friction with the wire mesh, so that the adjacent sound deadening material is There is no gap between the two, and it is possible to eliminate a decrease in sound deadening performance, and there is an effect that there is no fluid loss in the wire mesh. Invention 2
According to the invention, the holding plate surely holds the mutual positional relationship of the plurality of rods and simplifies the skewering. According to the third aspect, the bent ventilation passage has an effect of further reducing noise.

According to the muffler of the blower of the invention 4, there is an effect that only one muffling material is provided over the entire length of the case, and the laminating work itself can be eliminated. Further, since the muffling is not performed, the gap between the adjacent muffling materials is eliminated. It does not exist by nature, and has the effect of eliminating a decrease in silencing performance. According to the invention 5, the outer shape of the sound deadening material and the formation of the ventilation passage can be continuously formed by the slit, and according to the invention 6, the sound deadening material is completely prevented from being deformed by the dynamic pressure of the handling gas due to the wire mesh, and the slit prevents the sound deadening material from being deformed. The effect is that it is easy to attach the wire mesh.

According to the invention 7, since the retaining projection of the cylindrical case bites into the recess of the sound deadening material to secure the entire shape of the laminated sound deadening material, there is an effect that the work of stacking the sound deadening material is easy. Further, since there is no friction with the wire netting, there is no gap between the adjacent sound deadening materials, the reduction in sound deadening performance can be eliminated, and there is an effect that there is no fluid loss in the wire netting.

[Brief description of drawings]

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

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

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

FIG. 4 is a sectional view of the 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-sectional view of a main part of a conventional example.

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

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]

3 Opening 4 Bottom 5 Case 6 Ventilation path 10 Silencing device 11 Silencing material 12 Hole 13 Bar 14 Holding plate 21 Silencing material 22 Silencing material 24 Ventilation passage 31 Silencing material 32 Silencing material 33 Silencing material 34 Silencing material 41 Ventilation material 43 Silencing material 43 Outer shape 44 Slit 45 Wire mesh 51 Sound deadening material 52 Retaining protrusion

Claims (7)

[Claims] 1. A silencer for a blower, comprising a silencer made of porous synthetic resin, having a ventilation passage communicating with the opening in a central portion, inside a cylindrical case having a bottom with an opening at both ends, in an axial direction. A sound deadening device for a blower, wherein the outside of the ventilation passage of the sound deadening material laminated on a sheet is skewered with an axial rod. 2. A muffler for a blower according to claim 1, wherein the rod is fixed to a holding plate having an air passage in the center and having an outer shape in contact with the inside of the case. . 3. The muffler for a blower according to claim 1, wherein the ventilation passages of the adjacent silencers are displaced or have different shapes to bend the continuous ventilation passage. Silencer. 4. A silencer for a blower, comprising a cylindrical case having a bottom with an opening at both ends, and a silencer made of porous synthetic resin having a ventilation passage communicating with the opening in a central portion thereof. A silencer for a blower, characterized in that the material is formed from one porous synthetic resin covering the both bottoms. 5. The silencer for a blower according to claim 4, further comprising an axial slit extending from the outer shape of the silencer to the ventilation passage. 6. The silencer for a blower according to claim 4, wherein a cylindrical wire net is provided inside the ventilation passage. 7. A silencer for a blower, comprising a silencer made of porous synthetic resin, having a ventilation passage communicating with the opening in a central portion, inside a cylindrical case having a bottom with an opening at both ends, A silencer for a blower, characterized in that a retaining protrusion that is continuous in the axial direction is formed on the inner wall of the cylindrical case, and a recess that the retaining protrusion bites into is formed in the laminated sound deadening material.