JP7390273B2 - Sound absorbing material mounting structure - Google Patents

Description

The present invention relates to a mounting structure for sound absorbing material.

Conventionally, engine generators have been used as emergency power sources, backup power sources, and the like. As a low-cost method of reducing noise generated from equipment such as engines, there is a known method of covering an engine generator with a package (casing) and attaching sound-absorbing material to the inner surface of the package (for example, Patent Document 1). reference).

In the packaged engine generator of Patent Document 1, a sound absorbing material is attached to the inside of the package that houses the engine and the generator. A holding member is fixed to the surface of the package to be adhered with an adhesive, and the sound absorbing material is held by being pushed into the holding member.

Japanese Patent Application Publication No. 2014-126034

If the sound-absorbing material is held by only the holding members disposed around the sound-absorbing material, there is a concern that the sound-absorbing material may come off the holding member and fall. In consideration of this point, in Patent Document 1, the range in which the holding member surrounds the sound absorbing material is made small. In Patent Document 1, a structure is adopted in which a large number of locations where the sound absorbing material is held by holding members are provided on the inner surface of the package.

However, in such a configuration, the amount of the holding member used tends to increase. If the amount of holding members used increases, there is a concern that, for example, the number of man-hours required for adhesion, material costs, processing costs, etc. will increase. Further, since the area surrounded by the holding member is small, the sound absorbing material is also small, and there is a risk that the sound absorbing material may be deformed when being pushed and inserted.

An object of the present invention is to provide a sound-absorbing material mounting structure that allows the sound-absorbing material to be appropriately mounted on the wall surface of a casing that accommodates a power generation device while suppressing an increase in the number of parts.

An exemplary sound-absorbing material mounting structure of the present invention is a structure in which the sound-absorbing material is mounted on a wall surface of a casing housing a power generation device, wherein a pair of sound-absorbing materials are opposed to each other with the sound-absorbing material disposed on the wall surface interposed therebetween. and a holding member that bridges the pair of wall parts and covers a part of the sound absorbing material.

According to the exemplary sound-absorbing material mounting structure of the present invention, the sound-absorbing material can be appropriately mounted on the wall surface of the casing housing the power generation device while suppressing an increase in the number of parts.

Front view showing the outline of the packaged power generation device Top view showing the outline of the packaged power generation device Schematic diagram to explain the outline of the mounting structure of the sound absorbing material Schematic cross-sectional view at position AA in Figure 3 Schematic diagram showing another example for explaining the outline of the sound-absorbing material mounting structure Schematic sectional view at BB position in Figure 5 Schematic exploded perspective view showing the configuration of the opening/closing door Schematic plan view showing the configuration of the opening/closing door Schematic sectional view at position CC in Figure 8 Schematic sectional view at position DD in Figure 8 Diagram for explaining a modification of the mounting structure of sound absorbing material applied to opening/closing doors Schematic side view showing the configuration of a horizontal holding member in a modified example Schematic side view showing the configuration of a vertical holding member in a modified example

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the term "horizontal" is used because the mounting surface S on which the packaged power generation device 100 shown in FIGS. 1 and 2 is mounted is parallel to the horizontal plane. Of the two directions that are parallel to the horizontal plane and orthogonal to each other, one is defined as the front-back direction, and the other is defined as the left-right direction. The direction perpendicular to the horizontal plane is defined as the vertical direction. The vertical direction is parallel to the up-down direction, and based on this, the expression "up-down" is used. Note that these directions are simply names used for explanation, and are not intended to limit the actual positional relationships and directions.

Furthermore, in this specification, two directions being "parallel" includes not only a state where the two directions do not intersect at all no matter how far they extend, but also a state where the two directions are substantially parallel. Furthermore, the phrase "two directions are orthogonal" includes not only a state in which the two directions intersect each other at 90 degrees, but also a state in which the two directions substantially intersect at 90 degrees. That is, "parallel" and "perpendicular" each include a state in which there is an angular shift in the positional relationship between the two to the extent that it does not depart from the gist of the present invention. Further, the drawings used in the explanation are for explaining the embodiments of the present invention, and do not necessarily represent the actual size, scale, etc.

<1. Packaged power generation device＞
FIG. 1 is a front view schematically showing a package type power generation device 100 to which the sound absorbing material mounting structure of the present invention is applied. FIG. 2 is a top view schematically showing a packaged power generation device 100 to which the sound absorbing material mounting structure of the present invention is applied. Note that the white arrows in FIG. 1 indicate the flow of air. The packaged power generation device 100 has a configuration in which a power generation device 2 is housed within a housing 1. In this embodiment, the housing 1 includes a rectangular parallelepiped main body 11 extending in the left-right direction, a hood 12 provided on the right side of the main body 11, and a cover 13 provided above the main body 11.

The main body part 11 is installed above the support stand 3 placed on a mounting surface S such as a floor or the ground. The main body portion 11 houses, for example, an engine 21 and a generator 22 that constitute the power generation device 2 . Engine 21 may be, for example, a diesel engine or a gas engine. The engine 21 may be replaced with another internal combustion engine such as a gas turbine. The generator 22 generates electric power using the driving force of the engine 21. The electric power generated by the generator 22 is supplied to a load outside the packaged power generation device 100. In addition, a fuel tank for supplying fuel to the engine 21, a radiator (both not shown), and the like are accommodated within the main body portion 11.

An opening/closing door 14 is arranged on the front side wall 11a and the rear side wall 11b of the main body part 11. The opening/closing door 14 is provided for operating and inspecting equipment such as the engine 21 and the generator 22 arranged in the main body 11 . In this embodiment, two opening/closing doors 14 are provided on the front wall 11a and two on the rear wall 11b, but the arrangement and number of opening/closing doors 14 may be changed as appropriate.

The hood part 12 constitutes a passage through which cooling air that has entered the main body part 11 from the left side wall 11c of the main body part 11 when the engine 21 is driven is discharged to the outside of the apparatus 100. Note that an air intake port (not shown) is provided on the left side wall 11c. The left side surface of the hood part 12 is connected to the inside of the main body part 11 through an opening (not shown) provided in the right side wall 11d of the main body part 11. The hood part 12 has an open bottom surface, and exhaust air is discharged from below the hood part 12.

The cover part 13 accommodates a muffler 23 arranged above the engine 21. The muffler 23 is connected to the exhaust port of the engine 21 via an exhaust pipe (not shown). A terminal exhaust pipe 23a of the muffler 23 projects from the right end of the cover portion 13 to the outside of the device 100. After the noise of the exhaust gas from the engine 21 is reduced by the muffler 23, it is discharged to the outside of the device 100 from the terminal exhaust pipe 23a.

While the packaged power generation device 100 is in operation, noise is generated from machinery such as the engine 21 . In consideration of this point, in this embodiment, a sound absorbing material is attached to the inner surface of the housing 1. For example, sound absorbing materials are attached to the front wall 11a, the rear wall 11b, the left wall 11c, the right wall 11d, the upper wall 11e, the inner surface of the hood 12, etc. of the main body 11. In the package type power generation device 100, since sound absorbing materials are attached at appropriate locations, noise leaking to the outside during operation can be reduced. Hereinafter, the mounting structure of the sound absorbing material applied to at least a part of the wall surface in the casing 1 of the packaged power generation device 100 will be described.

<2. Mounting structure of sound absorbing material＞
(2-1. Overview)
FIG. 3 is a schematic diagram for explaining the outline of the mounting structure for the sound absorbing material 4 according to the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view taken along line AA in FIG. 3. First, with reference to FIGS. 3 and 4, an outline of a structure for attaching the sound absorbing material 4 to the wall surface 1a of the casing 1 housing the power generating device 2 will be described according to the embodiment of the present invention.

Specifically, the wall surface 1a of the casing 1 is an inner surface of a wall that constitutes the casing 1. The wall surface 1a of the housing 1 is, for example, the inner surface of the front wall 11a, the rear wall 11b, the left wall 11c, the right wall 11d, the top wall 11e, etc. In the example shown in FIGS. 3 and 4, the wall surface 1a of the housing 1 is a flat surface. However, the present invention may be applied to walls that are not flat. The sound absorbing material 4 is made of, for example, glass wool, rock wool, or a porous urethane material.

As shown in FIGS. 3 and 4, the mounting structure for the sound absorbing material 4 includes a pair of wall portions W1 and W2 and a holding member HM. The pair of wall portions W1 and W2 face each other with the sound absorbing material 4 disposed on the wall surface 1a in between. The holding member HM bridges the pair of wall portions W1 and W2 and covers a portion of the sound absorbing material 4.

In such a configuration, not only the movement of the sound absorbing material 4 can be suppressed by the pair of walls W1 and W2, but also the movement of the sound absorbing material 4 can be suppressed by the holding member HM. That is, the function of suppressing the movement of the sound absorbing material 4 by the holding member HM can be improved. As a result, even if the size of the sound absorbing material 4 is increased, the possibility of the sound absorbing material 4 falling off can be reduced, and the number of parts required for attaching the sound absorbing material 4 to the wall surface 1a can be reduced. . Note that the holding member HM particularly suppresses movement of the sound absorbing material 4 in a direction perpendicular to the wall surface 1a. Furthermore, since the size of the sound absorbing material 4 can be increased, it becomes difficult to apply excessive force to the sound absorbing material 4 during installation, and deformation of the sound absorbing material 4 can be suppressed.

In the examples shown in FIGS. 3 and 4, the following configuration is adopted as a preferable configuration. The sound absorbing material 4 has a rectangular parallelepiped shape. The sound absorbing material 4 has a surface facing the wall surface 1a in contact with the wall surface 1a. The pair of wall portions W1 and W2 have their flat portions facing each other and are in contact with the sound absorbing material 4. The mounting structure for the sound absorbing material 4 includes a pair of other wall portions W3 and W4 that face each other in a direction orthogonal to the facing direction of the pair of wall portions W1 and W2, with the sound absorbing material 4 disposed on the wall surface 1a being sandwiched therebetween. It further includes: That is, the mounting structure for the sound absorbing material 4 includes a first pair of wall portions W1 and W2 whose opposing directions are shifted by 90° from each other, and a second pair of wall portions W3 and W4. With this configuration, movement of the sound absorbing material 4 in a direction parallel to the wall surface 1a can be further suppressed.

At least one of the four walls W1, W2, W3, and W4 is a wall originally included in the casing 1, and is preferably made of the same member as the member constituting the wall surface 1a. With such a configuration, it is possible to avoid specially arranging a wall portion for attaching the sound absorbing material 4, and it is possible to reduce the number of parts in the mounting structure for the sound absorbing material 4.

In the example shown in FIGS. 3 and 4, in detail, one end of both ends of the holding member HM in the bridging direction is fixed to the first wall W1 constituting the pair of walls W1 and W2, The other end is fixed to a second wall W2 that constitutes a pair of walls W1 and W2. As a method of fixing the holding member HM to the walls W1 and W2, for example, welding, a combination of bolts and nuts, etc. may be used. It is preferable that the holding member HM is in contact with the sound absorbing material 4, and even if a gap is formed between the sound absorbing material 4 and the holding member HM, it is preferable that the gap is made as small as possible. Thereby, movement of the sound absorbing material 4 can be further suppressed.

In addition, in the example shown in FIG. 3 and FIG. 4, the number of holding members HM is one, but the number of holding members HM may be plural. However, in a plan view facing the wall surface 1a of the housing 1, the holding member HM is preferably arranged at a position that divides the sound absorbing material 4 into two equal parts. With this configuration, the movement of the sound absorbing material 4 can be effectively suppressed while reducing the number of holding members HM.
In this example, the holding member HM is arranged at a position that bisects the sound absorbing material 4 in a plan view from a direction perpendicular to the wall surface 1a.

Moreover, the holding member HM may be arranged at a position different from the position where the sound absorbing material 4 is divided into two equal parts. For example, in a plan view facing the wall surface 1a of the housing 1, the holding member HM may be arranged along one end of the sound absorbing material 4. According to such a configuration, a part of the outer edge of the sound absorbing material 4 can be held down by the holding member HM, and movement of the sound absorbing material 4 can be suppressed.

Note that the holding member HM may be configured to bridge the second pair of walls W3 and W4 instead of bridging the first pair of walls W1 and W2. Further, the direction in which the holding member HM bridges the pair of wall portions W1, W2 is not limited to a direction parallel to the opposing direction of the pair of wall portions W1, W2, but also intersects with the opposing direction of the pair of wall portions W1, W2. It may be a direction.

FIG. 5 is a schematic diagram showing another example for explaining the outline of the mounting structure of the sound absorbing material 4. As shown in FIG. FIG. 6 is a schematic cross-sectional view taken along the line BB in FIG. In FIG. 5, in order to make it easier to understand the difference from the configuration in FIG. 3, it is assumed that the holding member HM and the bolt 200 are transparent, and are shown with broken lines. On the other hand, in FIG. 6, the holding member HM and the bolt 200 are depicted without being transparent. The examples shown in FIGS. 5 and 6 are generally similar to the examples shown in FIGS. 3 and 4, so the explanation of the overlapping parts will be omitted, and the explanation will focus on the different parts.

In the example shown in FIGS. 5 and 6, each of the wall portions W1 and W2 that constitute the pair of wall portions W1 and W2 has extension portions SP1 and SP2 that extend toward the opposing wall portions W1 and W2. The holding member HM is fixed to the extending parts SP1 and SP2. With the configuration in which the extension parts SP1 and SP2 are provided in this way, it is easy to secure an area for attaching the bolt 200 and the nut 201, and the holding member HM can be easily attached using the bolt 200 and the nut 201.

Specifically, the first wall W1 has a first extending portion SP1 extending toward the second wall W2, and the second wall W2 has a second extending portion SP2 extending toward the first wall W1. . The first extending portion SP1 and the second extending portion SP2 preferably extend from the end of each wall portion W1, W2 on the opposite side to the wall surface 1a in a direction parallel to the wall surface 1a. With this configuration, the extended portions SP1 and SP2 can be easily formed by bending.

The holding member HM has both ends in the bridging direction placed on the extension parts SP1 and SP2, and is fixed with a bolt 200 and a nut 201. A hole through which the bolt 200 is passed is formed in the holding member HM and the extension parts SP1 and SP2. As a preferable form, the nut 201 is disposed integrally with the extending parts SP1, SP2 on the surface of the extending parts SP1, SP2 facing the sound absorbing material 4 (the surface opposite to the side facing the holding member HM). It is preferable that With this configuration, the bolt 200 can be installed efficiently.

In addition, it is preferable that the thickness (length in the direction orthogonal to the wall surface 1a) of the extended portions SP1 and SP2 is made as thin as possible. With this configuration, the gap between the sound absorbing material 4 and the holding member HM arranged on the extending parts SP1 and SP2 can be made as small as possible, and the movement of the sound absorbing material 4 can be further suppressed. can. Note that it is also possible to bring the holding member HM into contact with the sound absorbing material 4 by reducing the thickness of the extending portions SP1 and SP2 (for example, to about several mm).

In some cases, the portions of the holding member HM that are fixed to the extension parts SP1 and SP2 may be arranged between the extension parts SP1 and SP2 and the sound absorbing material 4. With such a configuration, it is possible to prevent the holding member HM from protruding with respect to the wall portions W1 and W2. Furthermore, by bringing the holding member HM into contact with the sound absorbing material 4, the sound absorbing material 4 can be made more difficult to move. Specifically, the holding member HM may be arranged between the extending portions SP1, SP2 and the sound absorbing material 4 in the direction orthogonal to the wall surface 1a. In the direction perpendicular to the wall surface 1a, the holding member HM can be configured not to protrude from the wall portions W1 and W2.

Further, it is preferable that the outer edge of the sound absorbing material 4 is arranged between the wall surface 1a of the housing 1 and the extension parts SP1 and SP2. Thereby, the sound absorbing material 4 can be held down by the extending parts SP1 and SP2, and the possibility that the sound absorbing material 4 will fall off can be further reduced. When adopting such a configuration, each of the wall portions W1 and W2 should have an extending portion over a wide range (for example, the entire range) of the end opposite to the wall surface 1a of the housing 1. is preferred. Thereby, it is possible to widen the range in which the outer edge of the sound absorbing material 4 is pressed by the extending portion. A configuration in which the extending portion is provided over a wide range of the wall portion will be described in detail with reference to a detailed example of the mounting structure of the sound absorbing material 4 described below.

In addition, in the example shown in FIGS. 4 and 5, extending portions may be provided not only in the first wall portion W1 and the second wall portion W2, but also in the third wall portion W3 and the fourth wall portion W4. At this time, it is preferable that the extending portion be provided over a wide range of each wall portion. Thereby, a wide range of the outer edge of the sound absorbing material 4 can be held down by the extending portion.

(2-2. Detailed example)
In a detailed example of the mounting structure for the sound absorbing material 4, the wall surface 1a of the casing 1 to which the sound absorbing material 4 is mounted expands in a direction parallel to the vertical plane. The wall surface 1a of the housing 1 is, for example, the inner surface of the front wall 11a, the rear wall 11b, the left wall 11c, the right wall 11d, etc. of the main body 11. In a plan view from a direction perpendicular to the vertical plane, the sound absorbing material 4 has a rectangular shape having two sides extending in the vertical direction and two sides extending in the horizontal direction. That is, the sound absorbing material 4 has a rectangular parallelepiped shape.

The pair of wall portions facing each other with the sound absorbing material 4 in between are horizontally opposite to the first pair of wall portions W1 and W2 facing each other in the vertical direction in a plan view from a direction perpendicular to the vertical plane. a second pair of wall portions W3 and W4. The holding member includes at least one of a vertical holding member HM1 that bridges the first pair of wall portions W1 and W2, and a horizontal holding member HM2 that bridges the second pair of wall portions W3 and W4. By adopting such a configuration, the sound absorbing material 4 can be appropriately attached to the wall surface 1a extending in a direction parallel to the vertical plane of the housing 1 while suppressing an increase in the number of parts.

A case in which the mounting structure of the sound absorbing material 4 is applied to the opening/closing door 14 forming the side wall of the housing 1 will be described in more detail as an example. Here, the description will be made assuming the opening/closing door 14 provided on the rear wall 11b of the main body 11. That is, as an expression of the direction with respect to the opening/closing door 14, an expression assuming the opening/closing door 14 provided on the rear side wall 11b is used.

FIG. 7 is a schematic exploded perspective view showing the structure of the opening/closing door 14. As shown in FIG. FIG. 8 is a schematic plan view showing the inner structure of the opening/closing door 14. As shown in FIG. FIG. 9 is a schematic sectional view taken along the line CC in FIG. 8. FIG. 10 is a schematic cross-sectional view taken along the line DD in FIG. 8. The opening/closing door 14 includes a door member 141, a sound absorbing material 4, a vertical holding member HM1, and a horizontal holding member HM2.

The door member 141 is formed, for example, by processing a metal plate such as an iron plate. Two hinges 142 are attached to the left end of the door member 141 at intervals in the vertical direction. The door member 141 is rotatably attached to the rear wall 11b of the housing 1 via a hinge 142. In the closed state, the door member 141 is flush with the rear wall 11b of the housing 1 and constitutes a side wall of the housing 1.

The door member 141 has a door main wall part 1411, a door upper wall part 1412, a door lower wall part 1413, a door left wall part 1414, and a door right wall part 1415. The door main wall portion 1411 has a rectangular flat plate shape that spreads in a direction parallel to the vertical plane and extends in the vertical direction. The door main wall portion 1411 forms a surface flush with the rear wall 11b when the door member 141 is closed. A grip part 143 that is held by a person when opening and closing the door member 141 is arranged in the vertical center of the right end of the door main wall part 1411. That is, a grip part 143 for opening and closing the door member is attached to the door member 141. The shape of the grip portion 143 may be, for example, a lever shape or a cylindrical shape. Note that the grip portion 143 is provided on the rear surface side (outer surface side) of the opening/closing door 14.

The door upper wall portion 1412 has a rectangular plate shape that projects forward from the upper end of the door main wall portion 1411 and extends in the left-right direction. The door lower wall portion 1413 has a rectangular plate shape that projects forward from the lower end of the door main wall portion 1411 and extends in the left-right direction. The door left wall portion 1414 is a rectangular plate that projects forward from the left end of the door main wall portion 1411 and extends in the vertical direction. The door right wall portion 1415 is a rectangular plate that projects forward from the right end of the door main wall portion 1411 and extends in the vertical direction. Note that the amount that the door upper wall portion 1412, the door lower wall portion 1413, the door left wall portion 1414, and the door right wall portion 1415 protrude forward from the door main wall portion 1411 (the height of each wall portion) is the same. It is.

The door upper wall portion 1412 has a trapezoidal plate-shaped upper wall extension portion 1412a extending downward from the front end. The door lower wall portion 1413 has a trapezoidal plate-shaped lower wall extension portion 1413a extending upward from the front end. The door left wall portion 1414 has a trapezoidal plate-shaped left wall extension portion 1414a extending rightward from the front end. The door right wall portion 1415 has a trapezoidal plate-shaped right wall extension portion 1415a extending leftward from the front end. The upper wall extending portion 1412a, the lower wall extending portion 1413a, the left wall extending portion 1414a, and the right wall extending portion 1415a as a whole have a rectangular frame shape in plan view from the front and rear directions.

Note that the upper wall extending portion 1412a is provided with a rectangular plate-shaped upper wall extending portion protrusion 1412b that extends further downward near the right end. The lower wall extending portion 1413a is provided with a rectangular plate-shaped lower wall extending portion protrusion 1413b that extends further upward near the right end. The upper wall extension part protrusion 1412b and the lower wall extension part protrusion 1413b face each other in the vertical direction. The left wall extending portion 1414a is provided with a rectangular plate-shaped left wall extending portion protrusion 1414b that extends further to the right at the center in the vertical direction. A first through hole 1416 that penetrates in the front-rear direction is formed in the upper wall extension portion projection 1412b, the lower wall extension portion projection 1413b, and the left wall extension portion projection 1414b.

As described above, the sound absorbing material 4 has a rectangular parallelepiped shape in this example. The sound absorbing material 4 may be composed of a single sheet material, but may also be composed of a plurality of sheet materials stacked one on top of the other in the front-rear direction.

The vertical holding member HM1 is formed, for example, by processing a metal plate such as an iron plate. The vertical holding member HM1 extends in the vertical direction and has an L-shaped cross section. The length of the vertical holding member HM1 in the vertical direction is equal to or slightly shorter than the vertical distance between the door upper wall portion 1412 and the door lower wall portion 1413. Specifically, the vertical holding member HM1 includes a rectangular plate-shaped holding member wall portion HM1a parallel to the front-rear direction, and a rectangular plate-shaped holding member extension portion HM1b extending leftward from the front end of the holding member wall portion HM1a. have A second through hole HM1c that penetrates in the front-rear direction is formed in the upper part, lower part, and vertically central part of the holding member extension part HM1b.

The horizontal holding member HM2 is formed, for example, by processing a metal plate such as an iron plate. The horizontal holding member HM2 has a rectangular plate shape extending in the left-right direction. A third through hole HM2a penetrating in the front-rear direction is formed at the left end and right end of the horizontal holding member HM2.

In forming the opening/closing door 14, first, the vertical holding member HM1 is fixed to the door member 141 using bolts 200 and nuts 201. Specifically, the vertical holding member HM1 is stacked such that the holding member extension portion HM1b is behind the upper wall extension portion 1412a and the lower wall extension portion 1413a. At this time, the second through holes HM1c provided above and below the holding member extension part HM1b are overlapped with the first through holes 1416 provided in the upper wall extension part projection 1412b and the lower wall extension part projection 1413b. By inserting the bolt 200 from the front into the first through hole 1416 and the second through hole HM1c and tightening the bolt 200 using the nut 201 arranged on the rear surface of the holding member extension part HM1b, the vertical holding member HM1 is attached to the door member 141. can be attached to. Note that the nut 201 is preferably provided integrally with the vertical holding member HM1.

Next, the sound absorbing material 4 is fitted into the door member 141. Specifically, the upper end portion of the sound absorbing material 4 is placed between the upper wall extension portion 1412a and the door main wall portion 1411 in the front-rear direction. The lower end portion of the sound absorbing material 4 is inserted between the lower wall extension portion 1413a and the door main wall portion 1411 in the front-rear direction. The left end portion of the sound absorbing material 4 is inserted between the left wall extension portion 1414a and the door main wall portion 1411 in the front-rear direction. The right end portion of the sound absorbing material 4 is inserted between the holding member extension portion HM1b and the door main wall portion 1411 in the front-back direction.

Next, the horizontal holding member HM2 is attached using bolts 200 and nuts 201. Specifically, horizontal holding member HM2 is arranged in front of left wall extension portion 1414a and holding member extension portion HM1b. At this time, third through holes HM2a provided on the left and right sides of the horizontal holding member HM2 are provided in the first through hole 1416 provided in the left wall extension portion protrusion 1414b and in the vertical center of the holding member extension portion HM1b. It is overlapped with the second through hole HM1c. The bolt 200 is inserted into the third through hole HM2a and the first through hole 1416 from the front, and the bolt 200 is tightened using the nut 201 arranged on the rear surface of the left wall extension projection 1414b. Further, the bolt 200 is inserted into the third through hole HM2a and the second through hole HM1c from the front, and the bolt 200 is tightened using the nut 201 arranged on the rear surface of the holding member extension part HM1b. Thereby, the horizontal holding member HM2 is fixed. Note that the nut 201 is preferably provided integrally with the door member 141 and the vertical holding member HM1.

A mounting structure for mounting the sound absorbing material 4 on the wall surface 1a of the housing 1, which is applied to the opening/closing door 14 configured as above, will be described. In this detailed example, the wall surface 1a of the casing 1 is the inner surface of the door member 141 that constitutes the side wall of the casing 1. Specifically, the wall surface 1a of the housing 1 is the front surface of the door main wall portion 1411.

In the mounting structure for the sound absorbing material 4, a pair of wall portions facing each other with the sound absorbing material 4 disposed on the wall surface 1a therebetween includes a first pair of wall portions facing each other in the vertical direction. The first pair of walls includes a door upper wall 1412 disposed at the upper end of the door member 141 in the vertical direction, and a lower door wall 1413 disposed at the lower end of the door member 141 in the vertical direction.

The mounting structure for the sound absorbing material 4 includes a vertical holding member HM1 that bridges the door upper wall portion 1412 and the door lower wall portion 1413. The vertical holding member HM1 covers the sound absorbing material 4 with the holding member extension portion HM1b. According to this configuration, the movement of the sound absorbing material 4 in the front-rear direction can be suppressed by the vertical holding member HM1. Further, by arranging the vertical holding member HM1, the sound absorbing material 4 can be arranged while securing a space for arranging the parts of the grip part 143 provided for opening and closing the door member 141.

In a plan view from a direction perpendicular to the vertical plane, the vertical holding member HM1 is arranged along one end of the sound absorbing material 4 in the horizontal direction. Specifically, the vertical holding member HM1 is arranged along the right end of the sound absorbing material 4. By arranging the vertical holding member HM1, a gap 300 can be secured between the vertical holding member HM1 and the door right wall portion 1415 in the left-right direction. By securing the gap 300, it becomes possible to easily arrange the parts that constitute the grip portion 143.

In this detailed example, the door upper wall portion 1412 and the door lower wall portion 1413 that constitute the first pair of wall portions have extension portions 1412a and 1413a (1412a: upper wall extension) extending toward the opposing wall portions, respectively. part, 1413a: lower wall extension part). Each of the extending portions 1412a, 1413a is provided over the entire range of the front end of each of the wall portions 1412, 1413, and a sound absorbing material 4 is provided between each of the extending portions 1412a, 1413a and the front surface of the door main wall portion 1411. The outer edge of is placed. By providing such extending portions 1412a and 1413a, it is possible to suppress movement of the sound absorbing material 4.

Further, in this detailed example, as a preferable form, the portions of the vertical holding member HM1 fixed to the extending portions 1412a and 1413a (specifically, the upper wall extending portion protrusion 1412b and the lower wall extending portion protruding portion 1413b) are attached to the extending portion 1412a. , 1413a and the sound absorbing material 4. For this reason, it is possible to prevent the vertical holding member HM1 from protruding forward from the first pair of wall portions 1412 and 1413.

In addition, in this detailed example, as a preferable form, a pair of walls facing each other with the sound absorbing material 4 disposed on the wall surface 1a sandwiched therebetween are provided with walls facing each other in the horizontal direction in a plan view from a direction perpendicular to the vertical plane. A second pair of walls is included. In a plan view from a direction perpendicular to the vertical plane, the second pair of wall portions is constituted by a first door side wall portion 1414 disposed at the other end of the door member 141 in the horizontal direction, and a vertical holding member HM1. . In this detailed example, the first door side wall portion 1414 is a door left wall portion 1414 disposed at the left end of the door member 141. The second pair of wall portions is constituted by the door left wall portion 1414 and the holding member wall portion HM1a of the vertical holding member HM1.

The door left wall part 1414 and the holding member wall part HM1a, which constitute the second pair of wall parts, are extended parts 1414a and HM1b (1414a: left wall extended part, HM1b: holding part) extending toward the opposing wall parts, respectively. (member extension part). Each of the extending portions 1414a and HM1b is provided over the entire range of the front end of each of the wall portions 1414 and HM1a, and the sound absorbing material 4 is provided between each of the extending portions 1414a and HM1b and the front surface of the door main wall portion 1411. The outer edge is placed. By providing such extending portions 1414a and HM1b, movement of the sound absorbing material 4 can be further suppressed.

In this detailed example, as a preferred form, the mounting structure for the sound absorbing material 4 further includes a horizontal holding member HM2 that bridges the first door side wall portion 1414 and the vertical holding member HM1. By configuring the door member 141 to have the horizontal holding member HM2, it is possible to further suppress the movement of the sound absorbing material 4 in the direction (back and forth direction) orthogonal to the vertical plane, and to suppress the sound absorbing material 4 from falling off. . In particular, since the door member 141 is opened and closed, it tends to generate vibrations, and the sound absorbing material 4 tends to fall off. By adding the horizontal holding member HM2 as in this configuration, it is possible to make it difficult for the sound absorbing material 4 to fall off even in the door member 141 that is likely to generate vibrations.

Further, in this detailed example, as a preferable form, the horizontal holding member HM2 is provided at the same height position in the vertical direction as the grip portion 143. With this configuration, the horizontal holding member HM2 can be arranged at the center of the sound absorbing material 4 in the vertical direction, and the number of holding members can be minimized while making it difficult for the sound absorbing material 4 to fall off. can. Moreover, it is possible to suppress the sound-absorbing material 4 from bending by appropriately suppressing the position where the sound-absorbing material 4 is likely to bend. Note that the horizontal holding member HM2 may have a different height position in the vertical direction from the grip portion 143. In this case, the right end of the horizontal holding member HM2 may be fixed to the right wall extension portion 1415a.

(2-3. Variation of detailed example)
FIG. 11 is a diagram for explaining a modification of the mounting structure of the sound absorbing material 4 applied to the opening/closing door 14. FIG. 11 is a schematic plan view similar to FIG. 8. Identical elements are given the same reference numerals. The door member 141 has a space between the vertical holding member HM1 and the second door side wall 1415 disposed at one horizontal end of the door member 141 in a plan view from a direction perpendicular to the vertical plane (front-back direction). It has a gap 300. In this example, the second door side wall portion 1415 is a door right wall portion 1415 disposed at the right end of the door member 141.

The gap 300 is also formed in the detailed example described above (see FIG. 8, etc.). However, in this modification, an auxiliary sound absorbing material 4A that is separate from the sound absorbing material 4 is arranged in the gap 300. With this configuration, the sound absorbing function can be ensured over a wide range of the door member 141. The auxiliary sound absorbing material 4A may be made of the same material as the sound absorbing material 4, or may be made of a different material. In this example, the sound absorbing material 4 and the auxiliary sound absorbing material 4A have the same configuration except for the size.

Specifically, the auxiliary sound absorbing material 4A is not arranged in the region R1 of the gap 300 where the parts for attaching the grip part 143 are arranged. In this modification, the auxiliary sound absorbing material 4A is arranged above and below the region R1. The region where the auxiliary sound absorbing material 4A is not arranged may be provided other than the region R1. In this case, the number of auxiliary sound absorbing materials 4A may be greater than two.

Note that the outer edge of the auxiliary sound absorbing material 4A is preferably arranged between the upper wall extending portion 1412a, the lower wall extending portion 1413a, or the right wall extending portion 1415a and the door main wall portion 1411 in the front-back direction as appropriate. .

FIG. 12 is a schematic side view showing the configuration of the horizontal holding member HM2 in a modified example. As shown in FIGS. 11 and 12, in this modification, as a preferable form, the horizontal holding member HM2 has a contact surface HM2b that extends into the gap 300 and contacts the auxiliary sound absorbing material 4A in the vertical direction. With this configuration, the auxiliary sound absorbing material 4A placed in the gap 300 can be made difficult to move.

The horizontal holding member HM2 has a rectangular plate shape that generally extends in the left-right direction. However, the right end portion is C-shaped when viewed from above in a direction perpendicular to the vertical plane (front-back direction). This point differs from the configuration of the detailed example described above. Of the C-shaped portions, a portion HM2c that extends into the gap 300 on the right side of the vertical holding member HM1 has a protruding portion HM2d that protrudes rearward. This protruding portion HM2d constitutes a contact surface HM2b.

In this modification, the right end portion of the horizontal holding member HM2 is shaped like a C, but this shape is designed in consideration of avoiding contact with the component to which the grip portion 143 is attached. The shape of the right end portion may be changed as appropriate depending on the shape of the component to which the grip portion 143 is attached. Further, even when the right end of the horizontal holding member HM2 extends into the gap 300 as in this modification, the horizontal holding member HM2 and the door right wall portion 1415 can be arranged with a space left and right between them. preferable. Thereby, it is possible to suppress the dimensional management of the horizontal holding member HM2 from becoming complicated.

FIG. 13 is a schematic side view showing the configuration of the vertical holding member HM1 in a modified example. As shown in FIGS. 11 and 13, in this modification, as a preferable form, the vertical holding member HM1 has a protrusion that protrudes toward the second door side wall (right door wall) 1415 and presses the auxiliary sound absorbing material 4A. It has HM1d. With this configuration, the auxiliary sound absorbing material 4A placed in the gap 300 can be made more difficult to move.

The protruding portion HM1d protrudes rightward from the front end of the holding member wall portion HM1a, and has a rectangular plate shape. A plurality of protrusions HM1d are provided at intervals in the vertical direction. Two protrusions HM1d are provided above and below region R1. However, this is only an example, and the number of protrusions HM1d may be changed as appropriate. For example, one projection HM1d may be provided above and below the region R1. Further, a configuration may be adopted in which the number of protrusions HM1d is different above and below the region R1. Further, the shape of the protrusion HM1d may be changed as appropriate.

The protruding portion HM1d may be provided on the holding member wall portion HM1a by welding, for example. Further, as another example, the protruding portion HM1d may be formed by making a cut in the vertical holding member HM1 and bending the cut portion.

<3. Things to keep in mind>
Various changes can be made to the various technical features disclosed in this specification without departing from the spirit of the technical creation. Furthermore, the plurality of embodiments and modifications shown in this specification may be implemented in combination to the extent possible.

1... Housing 1a... Wall surface 2... Power generator 4... Sound absorbing material 4A... Auxiliary sound absorbing material 141... Door member 300... Gap 1412... Door upper wall part ( Components of the first pair of walls)
1412a...Top wall extension part (extension part)
1412b...Top wall extension part projection (extension part)
1413...Door lower wall (component of the first pair of walls)
1413a...Lower wall extension part (extension part)
1413b...Lower wall extension part protrusion (extension part)
1414...Door left wall (component of first door side wall and second pair of walls)
1414a...Left wall extension part (extension part)
1414b...Left wall extension part projection (extension part)
1415... Door right wall portion HM... Holding member HM1... Vertical holding member (holding member, component of the second pair of walls)
HM1a...Holding member wall part HM1b...Holding member extension part (extension part)
HM1d...Protrusion HM2...Horizontal holding member (holding member)
HM2b...Contact surface SP1...First stretching part (stretching part)
SP2...Second stretching section (stretching section)
W1...first wall (component of the first pair of walls)
W2...Second wall (component of the first pair of walls)
W3...Third wall (component of the second pair of walls)
W4... Fourth wall (component of the second pair of walls)

Claims (10)

A structure in which a sound absorbing material is attached to the wall of a housing housing a power generation device,
a pair of wall portions facing each other with the sound absorbing material disposed on the wall surface sandwiched therebetween;
a holding member that bridges the pair of wall portions and covers a portion of the sound absorbing material;
Equipped with
Each wall forming the pair of walls has an extending portion extending toward the opposing wall,
An outer edge of the sound absorbing material is disposed between a wall surface of the housing and the extending portion,
The holding member is fixed to the extension part,
A portion of the holding member fixed to the extending portion is a sound-absorbing material mounting structure arranged between the extending portion and the sound-absorbing material. The sound-absorbing material mounting structure according to claim 1 , wherein the holding member is arranged at a position that bisects the sound-absorbing material in a plan view facing the wall surface of the casing. The sound-absorbing material mounting structure according to claim 1 , wherein the holding member is arranged along one end of the sound-absorbing material in a plan view facing a wall surface of the housing. A structure in which a sound absorbing material is attached to the wall of a housing housing a power generation device,
a pair of wall portions facing each other with the sound absorbing material disposed on the wall surface sandwiched therebetween;
a holding member that bridges the pair of wall portions and covers a portion of the sound absorbing material;
Equipped with
The wall surface of the housing is an inner surface of a door member that constitutes a side wall of the housing,
The pair of walls are
a first pair of walls facing each other in the vertical direction;
a second pair of walls facing each other in the horizontal direction;
including;
The holding member is
a vertical holding member bridging the first pair of wall portions;
a horizontal holding member bridging the second pair of walls;
A sound-absorbing material mounting structure including at least one of the following. The first pair of walls are:
a door upper wall portion disposed at a vertically upper end of the door member;
a door lower wall portion disposed at a vertical lower end of the door member;
It is composed of
The sound-absorbing material mounting structure according to claim 4 , further comprising the vertical holding member bridging the door upper wall portion and the door lower wall portion. The vertical holding member is arranged along one horizontal end of the sound absorbing material,
The second pair of walls are:
a first door side wall portion disposed at the other end of the door member in the horizontal direction;
the vertical holding member;
It is composed of
The sound absorbing material mounting structure according to claim 5 , further comprising the horizontal holding member that bridges the first door side wall portion and the vertical holding member. A grip for opening and closing the door member is attached to the door member,
7. The sound absorbing material mounting structure according to claim 6 , wherein the horizontal holding member is provided at the same height position in the vertical direction as the gripping portion. The door member has a gap in the horizontal direction between the vertical holding member and a second door side wall portion disposed at one horizontal end of the door member,
8. The sound absorbing material mounting structure according to claim 6 , wherein an auxiliary sound absorbing material that is separate from the sound absorbing material is arranged in the gap. The sound absorbing material mounting structure according to claim 8 , wherein the horizontal holding member has a contact surface that extends into the gap and contacts the auxiliary sound absorbing material in a vertical direction. The sound-absorbing material mounting structure according to claim 8 or 9 , wherein the vertical holding member has a protrusion that protrudes toward the second door side wall and presses the auxiliary sound-absorbing material.

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