JP2005337043A - Noise reduction method of power generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise reduction method in the package of a power generating device comprising an outer wall, a shielding plate and a noise absorbing material fixed to the outer wall by a strut. <P>SOLUTION: There is composed of a package base structure and a noise reduction structure. The combination of the shielding plate and the noise absorbing material forming the noise reduction structure can be locally changed corresponding to a noise producing source. The shielding plate fixed to the strut is secured with a fixed bolt by interposing a vibration-proofing material. The combination of the shielding plate and the noise absorbing material can be locally changed by interposing the outer wall and the shielding plate or the noise absorbing material between the outer wall and the shielding plate to prevent noise irregularity. As for the package base structure, the vibration of the shielding plate occurring by the noise collision can be prevented by securing the shielding plate to the outer wall by the vibration proofing material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a generator and a generator equipped with a generator, and more particularly to a method for reducing noise generated from a generator and a generator.

In the power generation apparatus in which the prime mover and the generator are mounted inside the package (enclosure), measures for noise reduction are taken.
FIG. 8 shows a configuration diagram of the power generator. Reference numeral 1 denotes a floor base, 2 denotes a diesel engine 2 which is a prime mover, and 3 denotes a generator. The generator 3 and the diesel engine 2 are connected to each other and arranged on the floor base 1 through vibration-proof rubber or the like. 4 is a control unit, 5 is a radiator, and 1 to 5 are covered with a casing 6. Reference numeral 7 is a cooling air intake port, and 8 is a cooling air outlet. The cooling air flows in the direction of the arrow to cool the prime mover 2, the generator 3, etc., and is discharged from the outlet 8 to the atmosphere.
As noise reduction measures in the power generation device having such a configuration, (1) increase the thickness of the outer wall of the housing 6, (2) add a shielding plate inside the outer wall, (3) increase the thickness of the sound absorbing material inside Noise is reduced by means of increasing alone or in any combination. As one example, the one disclosed in Patent Document 1 is publicly known.
The thing of this patent document 1 makes the bottom face of a housing double, or arrange | positions the sound-absorbing material between double bottoms.
JP 2003-20951 A

In the case of noise reduction measures by the above configurations (1) to (3), or a combination thereof, the package noise may be a low noise part and a slightly high part due to the difference in the distance between the noise source of the internal equipment and the housing. Sound unevenness occurs.
Generally, since the outer wall of the package uses steel, the walls are manufactured with the same thickness. At that time, the thickness of the wall is determined so that the loudest part can be reduced.
For this reason, the thickness of the low-noise part is the same as that of the highest part, resulting in uneven sound, and over-specs when considering the production cost of the package.
In addition, a shield plate is attached to the inside of the outer wall in order to realize an ultra-low noise power generator, but sound reduction as calculated is not possible. When the cause was investigated, the generated sound collided with the shielding plate, and this collision caused the shielding plate to vibrate. This vibration was propagated to the outer wall, and the vibration was changed to noise, which could not be reduced as calculated. It has been found.

  Accordingly, an object of the present invention is to provide a noise reduction method capable of reducing noise while reducing costs.

The present invention is a package of a power generator having a prime mover and a generator, and this package is composed of an outer wall, a shielding plate fixed to the outer wall via a support, and a sound absorbing material.
The combination of the shielding plate and the sound absorbing material constituting the package is locally varied according to the noise generation source, and the shielding plate fixed to the column is fixed by a fixing bolt with a vibration isolating material interposed. It is what.

  A second aspect of the present invention is characterized in that the local variation by the combination of the shielding plate and the sound absorbing material according to the noise generation source is an outer wall and a shielding plate.

  According to a third aspect of the present invention, the local variation by the combination of the shielding plate and the sound absorbing material according to the noise generation source is characterized in that a sound absorbing material is interposed between the outer wall and the shielding plate.

  According to a fourth aspect of the present invention, the local variation by the combination of the shielding plate and the sound absorbing material according to the noise generating source is characterized in that a sound absorbing material is disposed on the noise generating source side shielding plate. .

  According to a fifth aspect of the present invention, the shield plate is fixed to the column by screwing a screw portion on the side opposite to the outer wall of the column and screwing the shield plate fitted with a vibration-proof material in the mounting hole via a fixing bolt. It is characterized by being screwed into the part.

  The sixth aspect of the present invention is characterized in that the shielding plate is fixed to the column by positioning and fixing the shielding plate fitted with a vibration-proof material in the mounting hole at an arbitrary position in the axial direction of the column. .

  The seventh aspect of the present invention is that the shielding plate is fixed to the support column by screwing a screw portion on the side opposite to the outer wall of the support column, and fixing with a fixing bolt with a vibration isolating material interposed between the shielding plate and the support column end. It is characterized by.

As described above, according to the present invention, it is possible to select an optimum noise reduction structure based on the combination of the sound absorbing material and the shielding plate, and the shielding plate disposed on the inner side of the outer wall with the package base structure is used as the vibration isolating material. In addition, since this shield plate is not fixed by welding as in the prior art, but is fixed by a fixing bolt, it is easy to attach and remove the shield plate, and the thickness of the shield plate Since the material and the material can be freely changed, noise unevenness can be prevented.
In addition, in the present invention, since it can be basically classified into a package base structure and a noise reduction structure, standardization is possible. Specifically, the package base structure is designed according to the mechanical strength without much awareness of noise, and as the noise reduction structure, the wall thickness of the package composed of a shielding plate etc. for each noise spec in the base structure It is possible to cope with the change of.

The present invention is designed so that the thickness of the outer wall constituting the package is adjusted to a low noise part, and the thickness of the shielding plate and the presence / absence of a sound absorbing material are changed in consideration of the noise generation source or distance. It is intended to respond.
1 to 4 are partial cross-sectional views of a package, and show a noise reduction structure by a combination of a sound absorbing material and a shielding plate for constituting the package. In each figure, reference numeral 10 denotes an outer wall constituting the package, and the outer wall 10 has a thickness set based on a low noise part. Reference numeral 11 denotes a shielding plate made of sheet metal, the thickness of which is arbitrarily selected according to noise specifications. Reference numeral 12 denotes a support column. The support column 12 is used to fix the shielding plate 11, and one end thereof is fixed to the outer wall 10 by welding or the like. A shield plate 11 is attached to the other end side of the support column 12, and the shield plate 11 is fixed by a fixing bolt 14 via a vibration isolator 13 made of rubber or the like as will be described later. Reference numeral 15 denotes a reinforcing material formed in a cross-sectional view H shape, and one end thereof is fixed to the outer wall 10 by welding or the like. Reference numeral 16 denotes a first sound absorbing material interposed between the outer wall 10 and the shielding plate 11. Reference numeral 17 denotes a second sound absorbing material disposed between the shielding plate 11 and the end piece 15 ′ of the H-shaped reinforcing material 15.

  The wall of the package is basically constructed as shown in FIGS. 1 to 4, but the construction shown in FIGS. 1 to 4 is locally adopted depending on the local noise generation source. That is, the thing of FIG. 1 is used for the part with a low noise, and is comprised by the combination of the outer wall 10 and the shielding board 11. FIG. FIG. 2 shows that the sound absorbing material 16 is disposed on the outer side (outer wall side) of the shielding plate, and FIG. 4 shows that the sound absorbing material 17 is arranged on the inner side (noise generating source side) of the shielding plate 11. FIG. 3 shows a case in which a wall near the highest noise generating source is formed, and sound absorbing materials are arranged on both the inside and outside of the shielding plate 11. The package wall configured as described above can be arbitrarily selected according to the degree of the noise generation source and combined to suppress the unevenness of the sound.

5 to 7 show a package base structure for causing sound to collide with the shielding plate 11 to vibrate the shielding plate, preventing this vibration from propagating to the outer wall, and suppressing the unevenness of the sound. is there.
FIG. 5 shows a fixing method when the shielding plate 11 is relatively light. A thread portion is screwed to the support 12 in advance. The groove portion of the vibration isolator 13 is fitted into the attachment portion (hole) of the shielding plate 11, disposed at the inner front end portion of the column 12, and fastened by the fixing bolt 14 to be fixed. Therefore, since the vibration isolator 13 is interposed between the shielding plate 11 and the outer wall 10, the vibration of the shielding plate caused by the sound collision is absorbed and hardly propagates to the outer wall 10.

FIG. 6 is a configuration diagram when the wall thickness of the package is reduced. In this case, the mounting holes of the vibration isolator 13 are formed to be approximately the same as the outer dimensions of the support column 12, and are inserted to the arbitrary position in the axial direction of the support column 12 while being attached to the shielding plate 11. Compared with 5, the thickness is reduced by the dimension L. In FIG. 6, the thickness of the shielding plate 11 is made thicker than that of FIG. 5. Therefore, noise unevenness can be adjusted by arbitrarily setting the thickness of the shielding plate and the thickness of the package wall in this way, and the vibration of the shielding plate caused by the sound collision is absorbed by the vibration isolating material 13 and the outer wall. 10 is difficult to propagate.
FIG. 7 shows a fixing method when the shielding plate 11 is relatively heavy. If the shielding plate 11 is heavy, it is expected that it will be difficult for the vibration isolator 13 to support the shielding plate 11 through the groove. In such a case, an anti-vibration material 13 is sandwiched between the tip of the support column 12 and the shielding plate 11 and fixed with fixing bolts 14.

  As mentioned above, according to this invention, the optimal noise reduction structure by the combination of the sound-absorbing material and shielding board by FIGS. 1-4 can be selected. Further, in the package structure shown in FIGS. 5 to 7, the shielding plate 11 disposed inside the outer wall 10 is attached via a vibration isolator 13, and this shielding plate is fixed by welding as in the prior art. Instead, since it is fixed with the fixing bolt 14, the shielding plate can be easily attached and detached, and the thickness and material of the shielding plate can be freely changed, so that noise unevenness can be prevented.

The partial block diagram of the package wall which shows embodiment of this invention. The partial block diagram of the package wall which shows embodiment of this invention. The partial block diagram of the package wall which shows embodiment of this invention. The partial block diagram of the package wall which shows embodiment of this invention. The fragmentary figure which shows the package structure of this invention. The fragmentary figure which shows the package structure of this invention. The fragmentary figure which shows the package structure of this invention. The block diagram of a noise prevention type generator.

Explanation of symbols

1 ... Floor stand
2 ... prime mover
3 ... Generator
4. Control unit
5 ... Radiator
6 ... Package
7 ... Air intake
8 ... Air outlet
10 ... Outer wall
11 ... Shield plate
12 ... post
13 ... Vibration isolator
14 ... Fixing bolt
15 ... Reinforcing material
16 ... Sound absorbing material
17 ... Sound absorbing material

Claims (7)

A package of a power generator having a prime mover and a generator, the package comprising an outer wall and a shielding plate fixed to the outer wall via a support, a sound absorbing material,
The combination of the shielding plate and the sound absorbing material constituting the package is locally varied according to the noise generation source, and the shielding plate fixed to the column is fixed by a fixing bolt with a vibration isolating material interposed. Noise reduction method for power generators. 2. The noise reduction method for a power generator according to claim 1, wherein the local variation by the combination of the shielding plate and the sound absorbing material according to the noise generation source is an outer wall and a shielding plate. 2. The noise reduction method for a power generator according to claim 1, wherein the local variation by the combination of the shielding plate and the sound absorbing material in accordance with the noise generation source includes a sound absorbing material interposed between the outer wall and the shielding plate. 4. The local change by the combination of a shielding plate and a sound absorbing material according to the noise generating source is characterized in that a sound absorbing material is disposed on the shielding plate on the noise generating source side. The noise reduction method of the electric power generating apparatus of description. The shield plate is fixed to the column by screwing a screw part on the side opposite to the outer wall of the column, and screwing the shield plate fitted with a vibration-proof material in the mounting hole via a fixing bolt. The noise reduction method for a power generator according to any one of claims 1 to 4, wherein the noise reduction method is used. The fixing of the shielding plate to the support column is performed by positioning and fixing the shielding plate fitted with a vibration-proof material in the mounting hole at an arbitrary position in the axial direction of the support column. The noise reduction method of the electric power generating apparatus of description. The shielding plate is fixed to the column by screwing a screw part on the outer wall side of the column,
The method for reducing noise of a power generator according to any one of claims 1 to 4, wherein a vibration-proofing material is interposed between the shielding plate and the tip of the support column and fixed with a fixing bolt.

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