JPH05231124A - Sound absorbing body of silencer - Google Patents

Abstract

PURPOSE:To prevent the generation of strain and breakage by absorbing the thermal elongation difference between the sound absorbing body of a silence and a supporting side plate and prevent the generation of the stress corrosive crack due to the corrosive gas, etc., by removing a welded part. CONSTITUTION:A sound absorbing body for a silencer is equipped with a pair of supporting side plates 3 and 3 having a plurality of grooves 11 which are arranged oppositly, keeping an interval, a plurality of sound absorbing plates 2 whose side parts are inserted in demountable manner into the opposed grooves 11 and 11 on a pair of supporting side plates 3 and 3, and a buffering means (coil spring 5 and a cushion member 4) which is arranged between the sound absorbing plate 2 and the supporting side plate 3 in the above-described groove 11 and presses the sound absorbing plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorber used for a silencer such as a steam silencer for a power plant.

[0002]

2. Description of the Related Art A conventional steam silencer for a power plant is shown in FIG.
6 to FIG. As shown in FIG. 3, the muffler 21 has a diffuser 23 at the steam inlet and a sound absorbing section 2 at the outlet.
2, and a plurality of splitters 24 are arranged in the sound absorbing unit 22. As shown in FIGS. 5 and 6, the sound absorbing body 27 that constitutes the splitter 24 in the sound absorbing portion 22 includes a sound absorbing plate 28 made of porous ceramics and a sound absorbing plate frame 30.
It is equipped with a plate combined with.

The side plates 29 of the four steel plates are connected by welding at the portions indicated by reference numeral 32 to form a rectangular parallelepiped frame having an open front-rear direction, and the sound absorbing plate 2 is provided at the open portion of the frame.
Each of the sound absorbers 27 is formed by inserting the above-mentioned two plates in which 8 is combined with the sound absorbing frame 30 and spot welding the plate and the frame at a portion indicated by reference numeral 31.

As shown in FIG. 4, a splitter 24 is formed by arranging a plurality of the above sound absorbing bodies 27 side by side by a support member 26, and as described above, a plurality of the splitters 24 are formed. Are arranged in the casing 25 of the sound absorbing unit 22.

[0005]

In the sound absorber of the conventional silencer described above, the side plates 29 forming the sound absorber are connected by welding,
The sound absorbing plate frame 30 having the sound absorbing plate 28 mounted on the same side plate is firmly attached by spot welding. In the case of this structure, when exposed to high-temperature steam or gas discharged from the power generation equipment, the difference in thermal expansion between the sound absorbing plate 28 made of ceramics and the side plate 29 made of steel plate becomes large and receives thermal stress. May be damaged or the frame of the side plate may be deformed. Further, when exposed to corrosive gas such as geothermal power generation equipment, exhaust gas accompanied by corrosive solid matter, and steam, there was an incompatibility such that stress corrosion cracking occurred in the welded portion.

The present invention is intended to provide a sound absorber in a silencer that can solve the above problems.

[0007]

A sound absorber in a silencer of the present invention comprises a pair of support side plates having a plurality of grooves arranged at intervals and facing each other, and a pair of support side plates of the pair of support side plates facing each other. And a plurality of sound absorbing plates having both sides removably inserted therein, and a cushioning unit arranged between the sound absorbing plate and the supporting side plate in the above-mentioned configuration to press the sound absorbing plate.

[0008]

[Operation] When the sound absorber arranged in the silencer is in a high temperature state,
If the temperature change rate is large or the temperature distribution is unbalanced, a difference in thermal expansion occurs between the sound absorbing plate and the supporting side plate.

However, in the present invention, since the above-mentioned difference in thermal expansion is absorbed by the buffering means arranged in the groove of the supporting side plate, the supporting side plate is not distorted or broken, and the sound absorbing plate is not damaged. Does not crack. by this,
It is possible to realize a silencer that does not cause distortion or breakage in the sound absorber or cracks in the sound absorbing plate in a high temperature state as in the conventional device.

Further, since the sound absorbing body and the supporting side plate are pressed by the buffer means in the groove of the supporting side plate and there is no welded portion between both sides, stress corrosion cracking due to corrosive gas or the like may occur. It is extremely low and reliability is improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound absorber according to an embodiment of the present invention will be described with reference to FIGS. This sound absorbing body is similar to the above-mentioned conventional case in that the sound absorbing portion 22 of the silencer 21 shown in FIGS.
It constitutes the splitter 24 provided inside.

In this embodiment, the sound absorbing body 1 is provided with a sound absorbing plate 2 made of porous ceramics, and a supporting member of the sound absorbing plate 2 is supported by a supporting side plate 3 and a top plate 6 covering the upper end portion thereof.
Is divided into The supporting side plates 3 forming a pair are vertically arranged facing each other with an interval corresponding to the width of the sound absorbing plate 2, and both ends of each supporting side plate 3 extend in the vertical direction facing each other and the sound absorbing plate 2 of the pair of supporting side plates 3 faces each other. Grooves 11, into which both sides are detachably inserted, are formed by bending the supporting side plate 3. A coil spring 5 and a cushion material 4 made of ceramic fiber are housed in the groove 11 so as to sandwich the sound absorbing plate 2. The coil spring 5 and the cushion material 4 constitute a cushioning means for pressing the sound absorbing plate 2, and The sound absorbing plate 2 is held in the groove 11.

The top plate 6 is provided at its front and rear end with a mounting portion 12 facing the sound absorbing plate 1 and bent downward. Inside the mounting portion 12, a ceramic fiber cushion contacting the sound absorbing plate 2 is provided. Material 7 is attached. Further, a pressing portion 8 bent downward is provided at both end portions of the top plate 6, and a plurality of screw holes 10 are provided in the pressing portion 8.
The top plate 6 is fixed on the supporting side plate 3 by inserting screws (or rivets) 13 into 0 and a plurality of screw holes 9 provided in the upper part of the supporting side plate 3 correspondingly. Is becoming

In this embodiment, the sound absorbing plate 2 is inserted into the groove 11 of the supporting side plate 3 on both sides thereof, sandwiched between the coil spring 5 and the cushion member 4, and held, and the mounting portion 12 of the top plate 6 is held.
The upper part of the sound absorbing plate 2 is in contact with the cushion material 7. Therefore, the sound absorber 1 is placed in a high temperature state, a large temperature change rate, or an unbalanced temperature distribution, so that the thermal expansion difference between the support side plate 3, the top plate 6 and the sound absorbing plate 2 is increased. Even if occurs, it is absorbed by the coil spring 5, the cushion material 4, and the cushion material 7, so that the supporting side plate 3 and the top plate 6 are not distorted or broken, and the sound absorbing plate 2 is not cracked. ..

Further, since the top plate 6 is fixed to the supporting side plate 3 by the screw 13 and has no welded portion, stress corrosion cracking due to corrosive gas, corrosive solid, etc. does not occur, and reliability is improved. Can be increased.

In the above embodiment, two sound absorbing plates 2 are inserted into the grooves 11 at the front and rear ends 2 of the supporting side plate 3, but three or more grooves are formed in the supporting side plate. Provided,
A sound absorbing plate may be detachably inserted into each groove, and three or more sound absorbing plates may be used.

[0017]

According to the sound absorber of the muffler of the present invention, both sides of the sound absorbing plate constituting the sound absorber are detachably inserted into the grooves of the supporting side plate, and the sound absorbing plate is pressed by the buffering means in the grooves. Therefore, it is possible to reduce the thermal stress generated at the time of use, thereby causing distortion and breakage in the supporting side plate and cracking in the sound absorbing plate. Moreover, since there is no welded portion, the occurrence of stress corrosion cracking can be suppressed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a conventional silencer.

FIG. 4 is a perspective view of a splitter of a conventional silencer.

FIG. 5 is a perspective view of a conventional sound absorbing body.

6 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Sound Absorber 2 Sound Absorbing Plate 3 Support Side Plate 4 Cushion Material 5 Coil Spring 6 Top Plate 7 Cushion Material 8 Holding Portion 9 Screw Hole 10 Screw Hole 11 Groove 12 Mounting Part 13 Screw (or Rivet) 21 Sound Absorber 22 Sound Absorbing Part 23 Diffuser 24 Splitter 25 Casing 26 Supporting Material 27 Sound Absorber 28 Sound Absorbing Plate 29 Side Plate 30 Sound Absorbing Plate Frame

Claims (1)

[Claims] 1. A pair of supporting side plates having a plurality of grooves arranged at intervals and facing each other, and a plurality of sound absorbing plates having both side portions removably inserted in the facing grooves of the pair of supporting side plates. And a cushioning means that is disposed between the sound absorbing plate and the supporting side plate in the groove and presses the sound absorbing plate.