JPH08261009A - Soundproof engine - Google Patents

Abstract

(57) [Summary] [Structure] Ventilation passage 2 in a soundproof case containing the engine.
In the soundproof engine equipped with, the following was done. That is, a plurality of plate-like sound absorbing materials 5 having the vent holes 4 are laminated in contact with each other and filled in the ventilation passage 2, and the laminated body 3 is sandwiched from both end sides in the laminating direction to maintain the laminated state. Then, a series of sound absorbing passages 6 were formed in the laminated body 3 by the ventilation holes 4 continuous in the laminating direction. [Effect] Construction work of sound absorbing material is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof engine. The soundproof type engine according to the present invention includes not only a soundproof case in which the engine is housed alone but also a soundproof case in which the working machine and the like are housed together with the engine.

[0002]

2. Description of the Related Art As a conventional art of a soundproof engine, there is one in which the engine is housed in a soundproof case and a ventilation passage is provided in the soundproof case, as in the present invention.

Conventionally, in this type of soundproof engine, a sound absorbing material is attached to the inner wall of the ventilation passage in order to reduce leakage of engine noise from the ventilation passage.

[0004]

In the prior art, the construction work of sticking the sound absorbing material to the inner wall of the ventilation passage is complicated, and this has been a factor of reducing the manufacturing efficiency of the soundproof engine.

An object of the present invention is to provide a soundproof engine which can easily carry out a work of constructing a sound absorbing material.

[0006]

[Means for Solving the Problems]

(First Invention) As shown in FIG. 1, a first invention is a soundproof engine in which an engine E is housed in a soundproof case 1 and a ventilation passage 2 is provided in the soundproof case 1.
As shown in FIG. 3, a plurality of plate-like sound absorbing materials 5 having vent holes 4 are laminated in abutment shape and filled in the ventilation passage 2, and the laminated body 3 is sandwiched from both end sides in the laminating direction, and the laminated body is laminated. A characteristic is that a series of sound absorbing passages 6 are formed in the laminated body 3 by the ventilation holes 4 which are maintained in the state and are continuous in the laminating direction.

(Second Invention) The second invention is characterized in that, in the first invention, as shown in FIG. 3, the ventilation holes 4 connected in the stacking direction of the plate-shaped sound absorbing material 5 are arranged in a staggered manner.

(Third Invention) In the third invention, as shown in FIG. 4 or 5, in the first invention or the second invention, the size of the vent hole connected in the laminating direction of the plate-shaped sound absorbing material 5 is changed. Thus, the passage cross-sectional area of the sound absorbing passage 6 is changed.

[0009]

Actions and effects of the present invention

(First Invention) The first invention has the following effects and advantages (see FIGS. 2 to 6). Since a plurality of plate-shaped sound absorbing materials 5 are stacked and filled in the ventilation passage 2 and the laminated body 3 is sandwiched from both ends, construction can be performed. Therefore, when the sound absorbing material is attached to the passage wall 2d of the ventilation passage 2, Compared with this, the construction work becomes easier.

Since various laminated bodies 3 having different thicknesses can be prepared by changing the number of laminated plate-shaped sound absorbing materials 5, the same plate can be used for various soundproof engines having different ventilation passage 2 dimension settings. The sound absorbing material 5 can be used for general purposes.

(Second Invention) The second invention has the following effects and advantages in addition to the effects and advantages of the first invention (FIG. 3).
reference). A step portion 8 is generated in the intake passage 6, and the sound absorbing area of the laminated body 3 is widened by that much, and the sound absorbing performance is higher than that without the step portion 8.

The engine noise having a higher frequency is reflected by the step portion 8, and the reflected noise and the following noise interfere with each other, so that a part of the noise is silenced. High performance.

(Third Invention) The third invention has the following effects in addition to the effects of the first invention and / or the effects of the second invention (see FIG. 4 or FIG. 5). Since the frequency range of the engine noise absorbed is widened due to the change in the passage cross-sectional area of the sound absorbing passage 6, the sound absorbing performance is higher than that in the case where the passage cross-sectional area does not change.

[0014]

An embodiment of the present invention will be described with reference to the drawings.
1 and 2 are views for explaining a first embodiment of the present invention. In this embodiment, a soundproof engine generator is used, and its configuration is as follows. That is, FIG. 1 (A)
As shown in FIG. 2, the engine E and the generator G are arranged side by side and housed in the soundproof case 1, and these are supported on the floor 9 of the soundproof case 1 in a vibration-proof manner. The generator G is linked to the engine E via a transmission belt 14.

A ventilation passage 2 is provided in the soundproof case 1, and two ventilation fans 12 are provided in the ventilation passage 2. The ventilation passage 2 includes a ventilation passage 2a for intake of air on the upstream side of the engine E and a ventilation passage 2b for exhaust of air on the downstream side of the engine E. The intake port 13a of the air cleaner 13 is exposed to the air intake ventilation passage 2a. An exhaust muffler 1 is installed in the exhaust ventilation passage 2b.
0 and an exhaust lead-out pipe 11 led out downward from this are housed.

In this embodiment, in order to facilitate the construction work of the sound absorbing material provided in the ventilation passage 2, the following constitution is adopted. That is, as shown in FIG. 2, a plurality of plate-shaped sound absorbing materials 5 having vent holes 4 are laminated in abutment shape and filled in the ventilation passage 2, and the laminated body 3 is sandwiched from both end sides in the laminating direction. The laminated state is maintained, and a series of sound absorbing passages 6 are formed in the laminated body 3 by the vent holes 4 which are continuous in the laminating direction.

According to this structure, a plurality of plate-like sound absorbing materials 5 are laminated and filled in the ventilation passage 2, and the laminated body 3 is formed.
Since the construction can be performed only by sandwiching between the both ends, the construction work becomes easier than the case where the sound absorbing material is attached to the passage wall 2d of the ventilation passage 2. Further, since various laminated bodies 3 having different thicknesses can be prepared by changing the number of laminated plate-like sound absorbing materials 5, the same plate-like shape can be applied to various soundproof engines having different ventilation passage 2 dimension settings. The sound absorbing material 5 can be used universally.

As shown in FIG. 2 (B), the laminated body 3 is sandwiched between a pair of support plates 15 which are laid across the ventilation passage 2 in a transverse shape to maintain the laminated state. A pair of support plates 15
Is fixed to the passage wall 2d with screws. The support plate 15 is provided with a vent hole 16 which corresponds to the vent hole 4 of the plate-shaped sound absorbing plate 5 which is in contact with the support plate 15.

A plurality of ventilation holes 4 are provided in the plate-shaped sound absorbing material 5,
A series of partition walls 18 are formed in the laminated body 3 by the inter-ventilation wall 19 of the plate-shaped sound absorbing material 5 continuous in the laminating direction of the plate-shaped sound absorbing material 5. Sound absorbing passage 6
Is partitioned. Therefore, the passage wall 2 of the ventilation passage 2
Compared to the one in which a sound absorbing material is simply attached to d, the sound absorbing passage 6
The exposed area of the plate-shaped sound-absorbing material 5 is increased, the sound-absorbing performance is improved, and the leakage of engine noise from the ventilation passage 2 is reduced. Further, since the partition wall 18 is integrated with the laminated body 3, there is no room for disengagement or misalignment, and there is no room for deterioration of sound absorption due to dislodgement or blockage of the sound absorbing passage 6 due to misalignment.

A sound insulation plate 17 is sandwiched between the laminates 3, and a ventilation hole 16 corresponding to the ventilation hole 4 of the plate-shaped sound absorption plate 5 is opened like the support plate 18, and the sound insulation plate 1 is provided in the middle of the partition wall 18.
The inter-ventilation wall wall 20 of No. 7 is interposed. For this reason, the noise transmitted through the partition wall 18 collides with the inter-ventilation wall 20 of the sound insulating plate 17 and is reflected, and interferes with the subsequent noise, and the sound deadening property is enhanced as compared with the case where the sound insulating plate 17 is not provided.

As the plate-shaped sound absorbing material 5, glass wool molded into a plate shape is used. The sound insulation plate 1 is provided between the laminated surfaces.
By sandwiching 7, the abrasion of the surface of the plate-shaped sound absorbing plate 5 is reduced as compared with the contact between the glass wools, and the durability thereof is enhanced. From the viewpoint of reducing wear, it is desirable to use a metal plate, a synthetic resin plate, or the like having a small surface roughness for the sound insulation plate 17. Further, the sound insulation plate 17 is interposed between all the plate-shaped sound absorbing members 5. It is desirable to put it.

As shown in FIG. 1, the plate-shaped sound-absorbing material 5 is disposed in the exhaust ventilation passage 2b in the exhaust outlet pipe 1 of the exhaust muffler 10.
1 is filled in the passage portion 2c. As shown in FIG. 2, a pipe insertion hole 21 is opened in the plate-shaped sound absorbing material 5, and a series of pipe insertion passages 22 are formed in the laminated body 3 by the pipe insertion holes 21 which are continuous in the stacking direction of the plate sound absorbing material 5. The exhaust lead-out pipe 11 is inserted through the pipe insertion passage 22, and the exhaust lead-out pipe 11 is wrapped with the laminated body 3 from the periphery thereof.

Therefore, the heat insulation effect of the laminated body 3 suppresses the supercooling of the exhaust lead-out pipe 11 due to the ventilation exhaust air, the condensation of water in the exhaust lead-out pipe 11 hardly occurs, and the outlet 11a of the exhaust lead-out pipe 11 is prevented. Scattering of condensed water from (see FIG. 1A) is suppressed. Moreover, since it is only necessary to insert the exhaust lead-out pipe 11 into the laminated body 3, the work becomes easier as compared with the case where the heat insulating material is wound around the exhaust lead-out pipe 11. In addition, in this embodiment, as compared with a structure in which a sound absorbing material is simply attached to the passage wall 2d of the passage portion 2c, noise of about 3 decibels is generated at the outlet 2f of the exhaust ventilation passage 2b (see FIG. 1A). A reduction effect was obtained.

The second embodiment shown in FIG. 3 is a modification of the first embodiment, and in the first embodiment, the communication holes 4 connected in the laminating direction of the plate-shaped sound absorbing material 5 are arranged straight without any step. On the other hand, in the second embodiment, the communication holes 4 are arranged in a staggered manner. For this reason, the step portion 8 is generated in the sound absorbing passage 6, and the sound absorbing area of the laminate 3 is widened accordingly, and the sound absorbing performance is improved as compared with the case where the step portion 8 is not provided. Further, engine noise having a higher frequency is reflected by the step portion 8, and the reflected noise and subsequent noise interfere with each other to partly muffle the noise. Is high. The other structure is the same as that of the first embodiment.
The same elements as those in the embodiment are designated by the same reference numerals.

The third embodiment shown in FIG. 4 and the fourth embodiment shown in FIG. 5 are also modifications of the first embodiment, and in the first embodiment, the plate-like sound absorbing material 5 is connected in the stacking direction. The pores 4 have the same size and the passage cross-sectional area of the sound absorbing passage 6 does not change. On the other hand, in the third and fourth embodiments, the size of the vent hole 4 connected in the stacking direction of the plate-like sound absorbing material 5 is large. Is changed to change the passage cross-sectional area of the sound absorbing passage 6. Therefore, the frequency range of the engine noise to be absorbed is widened by the change of the passage cross-sectional area of the intake passage 6, so that the sound absorbing performance is higher than that in the case where the passage cross-sectional area is not changed.

Further, in the first embodiment, a plurality of intake passages 6
Are separated by partition walls 18 and are independent of each other, whereas in the third and fourth embodiments, the intermediate portions of the plurality of sound absorbing passages 6 are fused, and this fused portion is used as the expansion chamber 7. , The engine noise reduction performance is enhanced.

Further, in the first embodiment, the sound absorbing passage 6 is formed in a straight line along the laminating direction of the plate-like sound absorbing material 5, whereas in the fourth embodiment of FIG. 5, the sound absorbing passage 6 is formed. It is formed in a meandering shape. Therefore, the intake passage 6 can be secured for a long time,
High sound absorption performance.

Further, in the first embodiment, the plate-shaped sound absorbing material 5 is
Passage part 2 accommodating the exhaust outlet pipe 11 of the exhaust muffler 10.
In the fourth embodiment of FIG. 5, the plate-shaped sound absorbing material 5 is filled in the box-shaped passage 2e bent into an L-shape and stacked. The condition is maintained.

Other configurations of the third embodiment shown in FIG. 4 and the fourth embodiment shown in FIG. 5 are the same as those of the first embodiment.
-In FIG. 5, the same elements as those in the first embodiment are designated by the same reference numerals.

The fifth embodiment shown in FIG. 6 is also a modification of the first embodiment. In the first embodiment, the plate-shaped sound absorption is performed along the passage forming direction of the ventilation passage 2 in which the plate-shaped sound absorbing material 5 is accommodated. While the material 5 is laminated and the laminated state is maintained by the support plate 15, in the fifth embodiment shown in FIG. 6, the plate-shaped sound absorbing material 5 is laminated along the direction orthogonal to the passage forming direction, The laminated state is maintained by being sandwiched between the passage walls 2d. Other configurations are the same as those in the first embodiment, and in FIG. 6, the same elements as those in the first embodiment are designated by the same reference numerals.

FIG. 7 is a view for explaining various modifications of the plate-like sound absorbing material 5. In the first embodiment, the rectangular ventilation holes 4 are arranged in a row, whereas in FIG. 7 (A). In the case of FIG. 7 (C), the triangular ventilation holes 4 are arranged in a line, and in the case of FIG. 7 (B), rectangular and circular ventilation holes 4 are alternately arranged in a line.
In FIG. 7, the rectangular ventilation holes 4 are arranged in two rows.
In the case of (D), three slit-shaped ventilation holes 4 are arranged.

The contents of each embodiment of the present invention are as described above, but the present invention is not limited to the contents of each of the above embodiments. For example, in the first embodiment, the present invention is applied to a soundproof engine generator, but the model to which the present invention is applied is one in which the engine is housed in a soundproof case alone, other than the engine and the generator in the soundproof case. The work machine or the like may be housed. Further, in the first embodiment, as shown in FIG. 1, the plate-shaped sound absorbing material 5 is filled in the exhaust ventilation passage 2b, but the plate-shaped sound absorbing material 5 may be filled in the wind absorbing ventilation passage 2a. . Further, the material of the plate-shaped sound absorbing material 5 is not limited to glass wool, and may be urethane foam or the like.

[Brief description of drawings]

1 is a view for explaining a soundproof engine generator according to a first embodiment of the present invention, FIG. 1 (A) is a vertical sectional front view, FIG.
(B) is B of FIG. 1 (A) with the side wall of the soundproof case removed.
It is a direction arrow view.

2A and 2B are views for explaining a laminated body of plate-like sound absorbing plates filled in a ventilation passage of the soundproof engine generator shown in FIG. 1, FIG. 2A being a perspective view, FIG. 2 (C) is shown in FIG.
It is the CC sectional view taken on the line of (B).

FIG. 3 is a view corresponding to FIG. 2B of the second embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 2B of the third embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 2B of the fourth embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 2B of the fifth embodiment of the present invention.

7 (A) to 7 (D) are plan views of various modifications of the plate-shaped sound absorbing material that can be used in the present invention.

[Explanation of symbols]

1 ... Soundproof case, 2 ... Ventilation passage, 3 ... Laminated body, 4 ... Vent hole, 5 ... Plate-shaped sound absorbing material, 6 ... Sound absorbing passage, E ... Engine.

Claims (3)

[Claims] 1. A soundproof engine in which an engine (E) is housed in a soundproof case (1) and a ventilation passage (2) is provided in the soundproof case (1), and a vent hole (4) is opened. A plurality of plate-like sound absorbing materials (5) are laminated in abutment shape and filled in the ventilation passage (2), and the laminated body (3) is sandwiched from both end sides in the laminating direction to maintain the laminated state, A soundproof engine, characterized in that a series of sound absorbing passages (6) are formed in the laminate (3) by vent holes (4) extending in the stacking direction. 2. The soundproof engine according to claim 1, wherein the vent holes (4) connected in the stacking direction of the plate-shaped sound absorbing materials (5) are arranged in a staggered manner. 3. The soundproof engine according to claim 1 or 2, wherein the size of the vent holes (4) connected in the stacking direction of the plate-shaped sound absorbing material (5) is changed to make the sound absorbing passageway (6). The soundproof engine is characterized in that the passage cross-sectional area of is changed.