JP2003097292A - Intake silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake silencer, where the components of the intake silencer are made to be smaller in size and lighter in weight, so that easy handling and cost reduction are achieved, in the intake silencer of an power generating plant or the like designed to attenuate noise generated by an engine for power generation equipment or the like, when intake operation is being performed to a gas turbine used as the engine. SOLUTION: In the interior of the intake silencer, sound-absorbing deflecting boards are arranged at the upstream side of the propagation route of sound, sound-absorbing splitters are arranged on the downstream side; the former are provided in a standing condition extending from the bottom or the top of the intake silencer in a direction orthogonal to the longitudinal direction of the intake silencer, the latter are extended parallel along the longitudinal direction of the intake silencer, and the propagation route of sound is divided into a number of sections. As a result of such a construction, in addition to sound-absorbing effect, in which sound energy is converted into friction energy by sound-absorbing splitters to effect attenuation of sounds, propagation path of sound is deflected by sound absorbing deflecting boards, thereby generating interference of sounds and thus enhancing sound-absorbing effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake silencer for a power generator or the like, which muffles noise generated by an engine such as power generation equipment when the gas turbine is used as the engine. .

[0002]

2. Description of the Related Art An outline of a conventional intake silencer of this type will be described with reference to FIG. FIG. 4 schematically shows a conventional intake silencer, (a) is a longitudinal sectional view thereof, (b) is a plan view, (c) is a sectional view of an outer box, and (d) is a sectional view of a splitter. .

In a conventional power generator or the like, the gas turbine engine 4 serves as the sound source 3, and engine noise is propagated to the outside from the intake port of the combustion air, so that the engine duct 6 and the intake air are introduced into the intake path of the combustion air. The silencer 1 is installed so that the sound transmitted to the outside can be reduced.

Therefore, the general construction of the power generator is that the gas turbine engine 4 installed on the pedestal 5 is surrounded by the enclosure 2, and the intake silencer 1 and the gas turbine engine 4 arranged above the enclosure 2 are engine ducts. 6
The muffler duct 10 is arranged on the outlet side of the intake silencer 1.

Here, the intake silencer 1 is an outer box 12 having a structure in which a sound absorbing material 7 such as glass wool is arranged inside, covered with a cloth 8 such as a glass cloth, and further pressed by a punching metal 9 from above. A plurality of outer shells are defined and extend in the longitudinal direction from the connection opening position of the engine duct 6 to the end portion including the connection opening position of the muffling duct 10 and have the same height as the inner height of the outer box 12. (6 here)
The splitter 11 is disposed so as to extend in the longitudinal direction of the intake silencer 1.

As for the inside of the sound deadening duct 10 connected to the end of the outer box 12, the sound absorbing material 7 such as glass wool is covered with a cloth 8 such as glass cloth so as to be connected to the inner side of the outer box 12, and a fluid In order to prevent the scattering due to the flow, the punching metal 9 is pressed from above.

Further, the splitter 11 is the outer box 1
The sound absorbing material 7 is the same as the sound absorbing material 7 such as glass wool arranged inside 2, and the outside is covered with a cloth 8 such as a glass cloth, and is further suppressed by punching metal 9 from both sides to prevent scattering. It has a different structure.

In such a conventional intake silencer 1,
In order to improve the sound deadening effect, it is necessary to make the distance D1 between the splitters 11 arranged in parallel as narrow as possible, to make the thickness W2 of the splitter 11 large, and to make the length L3 of the splitter 11 long. It was

On the other hand, the number of the splitters 11 is determined by the intake air flow rate of the gas turbine engine 4 because the flow velocity between the adjacent splitters 11 is suppressed. It was suitable to use the splitter 11.

Further, since the specific numerical values differ in noise value and intake air flow rate depending on the output of the target engine, it is necessary to change each parameter accordingly. Now, at a position 1 m outward from the intake inlet. (Height: 1.2m), 8
Taking a gas turbine power generator with a 500 kVA output required to be suppressed to 5 dB (A) as an example, the standard dimensions of the intake silencer 1 in this power generator are as follows.

That is, the total length of the intake silencer 1: L1 = 350
0 mm, opening length of the muffling duct 10: L2 = 700 m
m, length of splitter 11: L3 = 2475 mm, total width of intake silencer 1: W1 = 1400 mm, splitter 11
Width (thickness): W2 = 100 mm, distance between adjacent splitters 11: D1 = 100 mm, height of intake silencer 1: H1 = 700 mm, sound absorbing material 7 arranged in outer box 12 including punching metal 9 Thickness: H2 = 50 mm.

[0012]

However, in the above-mentioned conventional intake silencer, it is unavoidable that the splitter 11 becomes large. For example, in the above-mentioned standard type, the splitter 11 is approximately It was 70 kg / sheet, and it was difficult to assemble it because it was impossible to handle it manually.

Not only the weight but also the outer shape is L3 ×
Since the size of W1 = 2475 mm × 1400 mm, the size of the silencer as a whole becomes large, and there is a problem that the installation place as a power generator is restricted.

The present invention solves the problems in the conventional intake silencer, and reduces the size and weight of the intake silencer constituent parts such as the splitter, facilitating the handling and reducing the cost. It is an object of the present invention to provide such an intake silencer.

[0015]

The present invention has been made to solve the above-mentioned problems, and as a first means thereof, an intake silencer arranged upstream of an engine duct in an intake path of a gas turbine engine. , Upstream of the sound propagation path that is opposite to the intake path, extends in a direction orthogonal to the longitudinal direction of the intake silencer, and is erected at the bottom or top of the intake silencer, and the sound propagation path is approximately 90 °. Intake air muffling provided with a plurality of sound absorbing deflection plates for deflecting, and provided with a plurality of sound absorption splitters extending in parallel along the longitudinal direction of the intake silencer to divide the sound propagation path on the downstream side of the sound propagation path. To provide a container.

That is, according to the first means, the intake silencer has, inside thereof, a sound absorbing deflection plate arranged on the upstream side of the sound propagation path and a sound absorbing splitter arranged on the downstream side, The former extends vertically from the bottom or top of the intake silencer in a direction orthogonal to the longitudinal direction of the intake silencer, and the latter extends in parallel along the longitudinal direction of the intake silencer to divide the sound propagation path into multiple parts. Therefore, in addition to the sound absorbing effect of converting sound energy into frictional energy by the sound absorbing splitter to muffle the sound, the sound absorbing deflector blocks almost 90% of the sound absorption while blocking the sound propagation path. This is intended to improve the sound absorbing effect by reducing the sound absorption due to the interference of sound by the deflection of °, shortening the sound absorbing area, and reducing the size and size of the intake silencer.

As a second means of the present invention, in the first means, a part of the plurality of sound absorbing deflection plates is erected continuously from the same direction of the bottom portion or the top portion of the intake silencer. The present invention provides an intake silencer in which a changing portion that expands or contracts the cross-sectional area of the sound propagation path is formed.

That is, according to the second means, in the inside of the intake silencer, the sound absorbing deflection plate arranged on the upstream side of the sound propagation path and the sound absorbing former of the sound absorbing splitter arranged on the downstream side. Since a part of a plurality of deflector plates installed is continuously erected from the same direction, either the bottom or the top of the intake silencer, toward the other, the sound propagation path is The cross-sectional shape is expanded / reduced, the sound interference is promoted, the sound deadening effect is promoted, the sound absorbing area is shortened, and the intake silencer is further miniaturized and made compact.

Further again. As a third means of the present invention, in the first means, on the upstream side of the sound propagation path,
The present invention provides an intake silencer in which a sound absorbing splitter similar to that on the downstream side is provided instead of the sound absorbing deflecting plate, and a sound absorbing deflecting plate is provided at the downstream end of the sound absorbing splitter.

That is, according to the third means, in the inside of the intake silencer, a sound absorbing splitter similar to the sound absorbing splitter arranged on the downstream side of the sound propagation path is arranged on the upstream side and the upstream side. At the downstream end of the sound absorbing splitter on the side, a sound absorbing deflection plate is provided to deflect the propagation path, so that similar sound absorption and sound absorption are performed on the upstream side and the downstream side of the sound propagation path, resulting in a sound deadening effect. This is greatly promoted, the sound absorption area is shortened, and the intake silencer is made smaller and more compact.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. 1A and 1B show an outline of a sound absorbing and silencer according to the present embodiment. FIG. 1A is a vertical sectional view thereof, FIG. 1B is a plan view thereof, and FIG. 2 is an explanatory view showing a sectional shape of a sound absorbing deflection plate.

In this embodiment, the basic structure such as the relative arrangement and arrangement of the intake silencers with respect to the power generator is the same as that of the conventional one described above, and therefore the common parts are the same in the drawings. The above description is referred to with the reference numeral attached, and redundant description will be omitted as much as possible, and points unique to the present embodiment will be mainly described.

That is, in the present embodiment, the intake silencer 1 has a sound absorbing structure inside the outer box 12 as in the conventional case, but the sound absorbing deflector plates 22 to 22 are mainly provided on the upstream side of the sound propagation path. 25, and the splitter 21 is arranged on the downstream side.

The structure of the splitter 21 is basically the same as that of the conventional splitter 11, but the length of the splitter 21 is greatly shortened, and the splitter 21 is compactly arranged at the downstream end of the sound propagation path, and the same sound propagation path is formed. It is divided into a plurality of pieces in parallel (in this example, six pieces of splitters 11 are used for division).

Each of the sound absorbing and deflecting plates 22 to 25 is formed in a trapezoidal cross section as will be described later. Explaining from the upstream side of the sound propagation path, each of the sound absorbing and deflecting plates 22 to 25 is close to the opening of the engine duct 6 and the intake silencer. A sound absorbing deflecting plate 22 is erected from the bottom of the intake device 1 to the upper side, and then sound absorbing deflecting plates 23 and 24 are vertically installed from the top of the intake silencer 1 to the upside down. The sound-absorption deflecting plate 25 is erected upward from the bottom at a position in contact with the upstream end of the.

As a result, as indicated by the thick black arrow in FIG. 1A, the engine duct 6 is moved upward at the position corresponding to the intake port of the gas turbine engine 4, and the sound absorbing deflection plate 22 is moved.
Is deflected by 90 °, and is deflected by 90 ° at each of the upright position and the lower tip open position of the sound absorbing and deflecting plate 23, and the sound is absorbed after passing through the expansion / contraction changing portion of the path sectional shape between the sound absorbing and deflecting plates 23 and 24. A sound propagation path that reaches the deflection plate 25, is deflected by 90 ° at the standing position of the sound absorption deflection plate 25, and is deflected by 90 ° at the upper tip open position, reaches the splitter 21, and passes through the splitter 21 toward the exit end thereof. Is formed, and the sound propagation path is defined by the gas turbine engine 4
It reverses the intake path.

The sound-absorbing deflecting plates 22 to 25 are the sound-absorbing material 7 such as glass wool disposed inside similarly to the splitter 21.
The outer side of the cover is covered with a cloth 8 such as a glass cloth, and the structure is further suppressed by punching metal 9 to prevent the scattering.
Is included.

The lower end 4 of the splitter 21 has a sound absorbing bottom 2
6 is provided, and the sound absorbing bottom 26 has the sound absorbing material 7, the cloth 8 and the punching metal 9 similarly to the splitter 21.

In the present embodiment configured as described above, the noise from the sound source 3 follows the propagation path of the sound in the direction opposite to the intake flow of the gas turbine engine 4, and the sound absorbing deflection plate 2
Bending (deflecting) 90 degrees laterally on the ceiling of the outer box 12 along the outer periphery of the second box 2, and then further bending 90 degrees by the sound absorbing and deflecting plate 23 to propagate downward.

Next, the bottom of the outer box 12 is further bent by 90 °, and the bottom of the outer box 12 goes straight to the left in the figure. However, since there is the sound absorbing deflecting plate 23 following the sound absorbing deflecting plate 23, the propagation path The cross-sectional shape changes, and the expansion and contraction of the cross-section causes sound interference, which promotes muffling.

The noise further progresses to 9 at the next sound absorbing deflection plate 25.
Bend upwards 0 ° and finally 90 ° on the top of the outer box 12.
Bend to the left, and after that the sound is silenced by the splitter 21 up to the intake inlet.

As shown in FIG. 2, the sound absorbing deflection plate 2
The cross-sectional shape of 2 to 25 is trapezoidal so that the air flow can be made smooth and the pressure loss can be reduced. Further, since the sound insulating plate 13 is provided in the center, the propagation of noise is prevented from passing through the inside of the sound absorbing material 7 and escaping from right to left.

As described above, according to the present embodiment, the sound absorption deflection plates 22 to 25 deflect the sound propagation path, and in this bend structure, the high frequency waves are mainly silenced by the sound interference, and finally the splitter. The sound is muted at 21 and is muted to the required sound pressure level at the intake inlet.

In the conventional sound deadening device, only the splitter 11 is employed, and it depends only on the sound absorbing effect of the sound absorbing material for converting the sound energy into the friction energy to muffle the sound. However, in the present embodiment, the splitter 21 is used. In addition to the sound absorption effect due to, the sound propagation path has a bend structure, and the cross-sectional shape is changed along the way to generate sound interference and enhance the sound deadening effect, which results in downsizing of the intake silencer. It was possible to achieve various requirements such as design and manufacturing, operation and other handling, and cost reduction.

In comparison with the conventional standard intake silencer 1 described above, a position (height: 1.
2 m), the standard size of the intake silencer 1 according to the present embodiment is obtained as follows, taking a gas turbine power generator of 500 kVA output that requires 85 dB (A) as an example.

That is, the total length of the intake silencer 1: L11 = 28
00 mm, length of splitter 21: L12 = 670 m
m, the length from the sound absorbing deflection plate 25 to the outlet of the intake silencer 1, L13 = 712 mm, the distance between the sound absorbing deflection plates 24 and 25: L14 = 415 mm, the distance between the sound absorbing deflection plates 23 and 24: L15 = 338 mm, Distance between the sound absorbing and deflecting plates 22 and 23: L16 = 350 mm, full width of the intake silencer 1: W11
= 1300 mm, width (thickness) of splitter 21: W12
= 75 mm, distance between adjacent splitters 21: D1
1 = 107 mm, height of intake silencer 1: H11 = 600
mm, height of splitter 21: H13 = 335 mm, thickness of sound absorbing bottom 26: H14 = 50 mm, length of long side of trapezoidal sound absorbing deflection plates 22-24: W13 = 175 mm, trapezoidal sound absorbing deflection plates 22-24 Short side length: W14 = 150m
m, the height of the trapezoidal sound absorbing deflection plates 22 to 24: H15 = 30
0 mm, long side length of the trapezoidal sound absorbing and deflecting plate 25: W13 =
150 mm, the short side length W14 of the trapezoidal sound absorbing deflection plate 25
= 88 mm, the height of the trapezoidal sound absorbing deflection plate 25: H15 = 2
It becomes 50 mm.

Comparing the above-mentioned standard size with the above-mentioned conventional one, for example, the total length of the intake silencer 1 is 700 m.
m, the overall width of the intake silencer 1 is reduced by 100 mm, and the height of the intake silencer 1 is reduced by 100 mm, and the size reduction is remarkable.

Next, a second embodiment of the present invention will be described with reference to FIG. 3A and 3B show an outline of the sound absorbing and muffling device according to the present embodiment. FIG. 3A is a vertical sectional view thereof, and FIG. 3B is a plan view thereof.

In the present embodiment, the basic structure such as the relative arrangement and arrangement of the intake silencers with respect to the power generator is the same as that of the conventional one as in the first embodiment. The same reference numerals are given in the drawings to refer to the above description, and the overlapping description will be omitted as much as possible, and points unique to the present embodiment will be mainly described.

That is, in the present embodiment, the intake silencer 1 has a sound absorbing structure inside the outer box as in the conventional case, but the sound absorbing deflector plate 42 is provided upstream of the sound propagation path.
Subsequent to this, a splitter 41 and a sound absorbing deflection plate 43 are provided. On the other hand, on the downstream side of the sound propagation path, the sound absorbing deflection plates 34 and 35 and the splitter 3 are arranged in a substantially symmetrical manner with the upstream side.
1 is arranged to form a sound propagation path as indicated by a thick black arrow in the figure.

Therefore, in this embodiment, the noise exiting the engine duct 6 is deflected by 90 ° above the sound absorbing and deflecting plate 42 and propagates to the splitter 41, and then the sound absorbing and deflecting plate 4 is arranged.
3 is deflected by 90 ° and descends along the sound absorbing deflecting plate 43, and is further deflected by 90 ° at the bottom of the outer box, and the sound absorbing deflecting plate 35 is deflected.
Then, the sound absorbing deflecting plate 35 deflects 90 °, propagates to the splitter 31, and is emitted to the outside through the splitter 31.

As described above, in the present embodiment, the sound absorption deflecting plate 43 and a plurality of sound absorbing deflecting plates 90 ° of the propagation path.
Bending (deflection), passing through the splitters 41, 31, and further expanding and contracting the cross section of the propagation path by the sound absorbing and deflecting plates 43, 34 continuously arranged upright in the same manner as described in the first embodiment. The sound is absorbed and the sound is muted due to the interference of the sound.

As described above, similar to the first embodiment, the intake silencer is downsized, and various constraints such as designing and manufacturing, operation and other handling are alleviated, and cost is reduced. I was able to do it.

Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

[0045]

As described above, according to the invention described in claim 1 of the present application, in the intake silencer arranged upstream of the engine duct in the intake path of the gas turbine engine, the propagation of the sound which goes backward to the intake path. On the upstream side of the path, a plurality of sound absorbing deflection plates are provided which extend in a direction orthogonal to the longitudinal direction of the intake silencer and are erected at the bottom or the top of the intake silencer to deflect the sound propagation path by approximately 90 °. Since the intake silencer is configured by providing a plurality of sound absorbing splitters that extend in parallel along the longitudinal direction of the intake silencer to divide the sound propagation path on the downstream side of the sound propagation path, the intake silencer is configured. In addition to the sound absorption effect of converting sound energy into friction energy and muffling it, sound absorption while blocking the sound propagation path by the sound absorption deflection plate and the interference of the sound due to the deflection of the propagation path by almost 90 ° due to the sound blocking Combined with the silencing etc., the sound absorbing effect is enhanced, the sound absorbing area is shortened, the intake silencer is made smaller and more compact, and various constraints such as design, manufacturing, operation and other handling conditions are set. It is possible to obtain a suitable intake silencer that achieves alleviation and cost reduction.

According to the invention described in claim 2, in the invention described in claim 1, a part of the plurality of sound absorbing deflecting plates is continuous from the same direction of the bottom or top of the intake silencer. Since the intake muffler is configured by forming a changing portion that expands and contracts the cross-sectional area of the sound propagation path,
Inside the intake silencer, the sound absorbing deflecting plate arranged upstream of the sound propagation path and the sound absorbing deflecting plate of the former of the sound absorbing splitters arranged downstream of the sound absorbing deflector are part of a plurality of those installed. , The intake muffler is continuously erected from either the same direction from the bottom or the top toward the other,
The cross-sectional shape of the sound propagation path in this part expands and contracts, facilitating sound interference and promoting the sound deadening effect, shortening the sound absorbing area, and further reducing the size and size of the intake silencer, and designing and manufacturing. It is possible to obtain a suitable intake muffler that achieves alleviation of various constraint conditions such as operation and other handling, cost reduction and the like.

Further, according to the invention described in claim 3, in the invention described in claim 1, the upstream side of the sound propagation path is the same as the downstream side instead of the sound absorbing deflection plate. A sound absorbing splitter is provided and a sound absorbing deflection plate is provided at the downstream end of the sound absorbing splitter to form an intake silencer.Therefore, in the inside of the intake silencer, a sound absorbing splitter arranged downstream of the sound propagation path is provided. A similar sound absorbing splitter is also arranged on the upstream side, and a sound absorbing deflecting plate is provided at the downstream end of the sound absorbing splitter on the upstream side to deflect the propagation path. Similar muffling and sound absorption will be performed repeatedly, the muffling effect will be greatly promoted, the sound absorption area will be shortened, and the intake muffler will be made even smaller and more compact. Relaxation of various constraints leading to have such one in which it was possible to obtain a suitable air intake silencer which achieves the cost reduction and the like.

[Brief description of drawings]

FIG. 1 shows an outline of a sound absorbing and silencer according to a first embodiment of the present invention, (a) is a vertical sectional view thereof, and (b) is a plan view thereof.

FIG. 2 is an explanatory diagram showing a cross-sectional shape of a sound absorbing deflection plate.

FIG. 3 shows an outline of a sound absorbing and silencer according to a second embodiment of the present invention, (a) is a longitudinal sectional view and (b) is a plan view.

4A and 4B schematically show a conventional intake silencer, in which FIG. 4A is a vertical sectional view thereof, FIG. 4B is a plan view thereof, and FIG.
(D) is sectional drawing of a splitter.

[Explanation of symbols]

1 Intake silencer 2 enclosure 3 sound sources 4 gas turbine engine 5 mounts 6 engine duct 7 Sound absorbing material 8 cross 9 punching metal 10 sound deadening duct 11 splitter 12 outer box 13 Sound insulation board 21, 31, 41 splitter 22, 23, sound-absorbing deflector 24, 25, sound absorbing deflection plate 26 Sound absorption bottom 34, 35, 36 Sound absorption deflection plate 42, 43 Sound absorption deflection plate

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 35/12 F02M 35/12 K

Claims (3)

[Claims] 1. An intake silencer arranged upstream of an engine duct in an intake path of a gas turbine engine, wherein the intake silencer is arranged upstream of a sound propagation path running in the intake path in a direction orthogonal to a longitudinal direction of the intake silencer. A plurality of sound absorbing and deflecting plates that extend and stand upright at the bottom or top of the intake silencer to deflect the sound propagation path by approximately 90 ° are provided, and in the longitudinal direction of the intake silencer at the downstream side of the sound propagation path. An intake silencer comprising a plurality of sound absorbing splitters that extend in parallel along the path and divide the sound propagation path. 2. A plurality of the sound absorbing deflection plates, a part of which is continuously erected from the same direction of the bottom portion or the top portion of the intake silencer to form a changing portion that expands or contracts the cross-sectional area of the sound propagation path. The intake silencer according to claim 1, wherein the intake silencer is provided. 3. A sound absorbing splitter similar to that on the downstream side is provided in place of the sound absorbing deflecting plate on the upstream side of the sound propagation path, and a sound absorbing deflecting plate is provided on the downstream end of the sound absorbing splitter. The intake silencer according to claim 1.