JPH0842521A - Air current expanding duct - Google Patents
Air current expanding ductInfo
- Publication number
- JPH0842521A JPH0842521A JP18122394A JP18122394A JPH0842521A JP H0842521 A JPH0842521 A JP H0842521A JP 18122394 A JP18122394 A JP 18122394A JP 18122394 A JP18122394 A JP 18122394A JP H0842521 A JPH0842521 A JP H0842521A
- Authority
- JP
- Japan
- Prior art keywords
- duct
- expansion
- plate
- guide plates
- plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Duct Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガスタービン排気ダク
ト等における、上流側ダクトの断面積より下流側ダクト
の断面積の方が大きい二種類のダクトを接続する部分に
適用される気流拡大ダクトに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine exhaust duct or the like which is applied to a portion for connecting two kinds of ducts in which the cross-sectional area of a downstream duct is larger than the cross-sectional area of an upstream duct. It is about.
【０００２】[0002]
【従来の技術】図２０は、上流側ダクトと、それより断
面積の大きい下流側ダクトを接続する従来の気流拡大ダ
クトの縦断面図である。Ａ1 は断面積の小さい上流側ダ
クト、Ａ2 は断面積の大きい下流側ダクト、Ａ3 はその
間を接続する従来の気流拡大ダクト、Ｌは同拡大ダクト
の長さ、Ｖは気体の流れの方向である。ダクトの断面形
としては円形、角形等いろいろある。この従来の気流拡
大ダクトの拡大角αは、約７°に設計されている。拡大
角が７°に設計されている理由は、７°を越えると境界
層で流体が剥離し逆流等の２次流れ域が生じ、主流の流
線が不規則にふらつくためである。2. Description of the Related Art FIG. 20 is a vertical cross-sectional view of a conventional air flow expansion duct connecting an upstream duct and a downstream duct having a larger cross-sectional area. A 1 is an upstream duct with a small cross-sectional area, A 2 is a downstream duct with a large cross-sectional area, A 3 is a conventional airflow expansion duct connecting between them, L is the length of the expansion duct, and V is the flow of gas. Direction. There are various duct sectional shapes such as circular and rectangular. The expansion angle α of this conventional air flow expansion duct is designed to be about 7 °. The reason why the expansion angle is designed to be 7 ° is that if it exceeds 7 °, the fluid separates in the boundary layer and a secondary flow region such as backflow occurs and the mainstream streamlines wobble irregularly.
【０００３】図２１は拡大角が７°を越えている急拡大
ダクトにおける流れの説明図である。図に示されるよう
に、この場合はダクトの壁面近くで剥離し逆流が生じ
る。FIG. 21 is an explanatory view of the flow in the sudden expansion duct whose expansion angle exceeds 7 °. As shown in the figure, in this case, backflow occurs due to separation near the wall surface of the duct.
【０００４】[0004]
【発明が解決しようとする課題】前述のように、従来は
境界層が剥離するのを防ぐために気流拡大ダクトの拡大
角を約７°としているが、小断面積側から大断面積側に
拡大する場合に気流拡大ダクトの長さＬ（図２０参照）
は、大小ダクトの断面積が大きければ大きい程、また大
小ダクトの断面積差が大きい程長くなる。そのためダク
トの占拠するエリアがプラントのレイアウトに与える影
響は大きい。As described above, conventionally, the expansion angle of the air flow expansion duct is set to about 7 ° in order to prevent the boundary layer from separating, but it is expanded from the small sectional area side to the large sectional area side. If the air flow expansion duct length L (see Figure 20)
Is longer as the cross-sectional area of the large and small ducts is larger and the cross-sectional area difference between the large and small ducts is larger. Therefore, the area occupied by the duct has a great influence on the plant layout.
【０００５】本発明は上記従来技術の欠点を解消し、剥
離を生じない急拡大可能のダクトを提供しようとするも
のである。The present invention aims to solve the above-mentioned drawbacks of the prior art and to provide a duct that can be rapidly expanded without causing separation.
【０００６】次に急拡大の気流拡大ダクトでは層安定が
微妙であり僅かな要因で剥離・付着を繰返す、所謂不安
定となる。これはスワール、流速など諸々の因子が複合
し合って起ると考えられるが、結果としてこの部位で振
動が生じ、騒音を増大させている。[0006] Next, in the sudden expansion of the air flow expansion duct, the layer stability is delicate and peeling / adhesion is repeated due to slight factors, which is so-called unstable. It is considered that this is caused by a combination of various factors such as swirl and flow velocity, but as a result, vibration occurs at this site, which increases noise.
【０００７】本発明は上記従来技術の欠点を解消し、騒
音の生じない急拡大ダクトを提供しようとするものであ
る。The present invention aims to solve the above-mentioned drawbacks of the prior art and to provide a sudden expansion duct that does not generate noise.
【０００８】[0008]
【課題を解決するための手段】本発明は上記課題を解決
したものであって、小断面積ダクトと大断面積ダクトと
の接続部に設けられる気流拡大ダクトにおいて、次の特
徴を有する気流拡大ダクトに関するものである。DISCLOSURE OF THE INVENTION The present invention has solved the above-mentioned problems, and in an air flow expansion duct provided at a connecting portion between a small cross-section area duct and a large cross-section area duct, it has the following characteristics. It is about ducts.
【０００９】（１）互いに向き合う小断面積ダクトの端
部と大断面積ダクトの端部を直線的に結んで接続する錐
台側面形状の外壁、同外壁の内側において同外壁に平行
に設置されその上流端が流路中心部のものほど下流側に
後退した位置に設けられている複数の錐台側面形状の拡
大案内板、及び同複数の拡大案内板の間において流れの
方向に沿って設けられ同拡大案内板の間隔を維持しかつ
それらを相互に固定する平板製、多孔板製又は支柱状の
保持板とからなる。(1) An outer wall having a side surface of a truncated cone connecting the ends of the small cross-sectional area duct and the end of the large cross-sectional area duct which are opposed to each other in a straight shape, and is installed parallel to the outer wall inside the outer wall. A plurality of frustum side surface-shaped enlarged guide plates are provided at positions where the upstream ends thereof recede toward the downstream side toward the center of the flow path, and between the plurality of enlarged guide plates are provided along the flow direction. It comprises a flat plate, a perforated plate, or a column-shaped holding plate that maintains the distance between the enlarged guide plates and fixes them to each other.
【００１０】（２）上記（１）項に記載の気流拡大ダク
トにおいて、保持板の代わりに、複数の拡大案内板の互
いに隣合うものの間において気流拡大ダクトの中心線に
対してスパイラル状に設けられ同拡大案内板の間隔を維
持しかつそれらを相互に固定する仕切板が設けられてい
る。(2) In the air flow expanding duct described in the above item (1), instead of the holding plate, a spiral shape is provided between adjacent ones of the plurality of expanding guide plates with respect to the center line of the air expanding duct. A partition plate is provided to maintain the space between the enlarged guide plates and fix them to each other.
【００１１】（３）大断面積ダクトと同一断面形状の部
分並びに同部分と小断面積ダクトとをステップ状に接続
する平板状部分から構成された外壁、小断面積ダクトの
端部と大断面積ダクトの端部を直線的に結んで接続する
錐台側面形状の最外部の拡大案内板、同最外部の拡大案
内板の内側において同最外部の拡大案内板に平行に設置
されその上流端が流路中心部のものほど下流側に後退し
た位置に設けられている複数の錐台側面形状の拡大案内
板、及び同複数の拡大案内板の間において流れの方向に
沿って設けられ同拡大案内板の間隔を維持しかつそれら
を相互に固定する保持板とからなり、上記各拡大案内板
が多孔板からなり、かつ上記外壁と最外部の拡大案内板
との間に防音材が充填されている。(3) An outer wall composed of a portion having the same cross-sectional shape as the large cross-sectional area duct and a flat plate-like portion connecting the same portion and the small cross-sectional area duct in a stepwise manner, and an end portion of the small cross-sectional area duct and a large cut. The outermost expansion guide plate in the shape of a truncated pyramid that connects the ends of the area duct in a straight line, and is installed parallel to the outermost expansion guide plate inside the outermost expansion guide plate and its upstream end. A plurality of frustum-sided enlarged guide plates that are provided at positions that are retracted toward the downstream side toward the center of the flow path, and the enlarged guide plates that are provided along the flow direction between the plurality of enlarged guide plates. And a holding plate that maintains the distance between them and fixes them to each other, each of the enlarged guide plates is a perforated plate, and a soundproof material is filled between the outer wall and the outermost enlarged guide plate. .
【００１２】（４）上記（３）項に記載の気流拡大ダク
トにおいて、最外部の拡大案内板を除く個々の拡大案内
板が、近接して設けられた一対の多孔板と同一対の多孔
板の間に部分的に空洞部を残して充填された防音材とか
ら構成されている。(4) In the airflow expansion duct described in the above item (3), the individual expansion guide plates except the outermost expansion guide plate are provided between a pair of adjacent perforated plates and the same pair of perforated plates. And a soundproof material partially filled with a hollow portion.
【００１３】[0013]
（１）複数の錐台側面形状の拡大案内板が外壁に平行に
設けられているものにおいては、気流が強制的に外壁に
平行に案内されるので、急拡大が可能である。保持板は
拡大案内板を保持固定する作用のものである。(1) In the case where a plurality of frustum side surface-shaped enlarged guide plates are provided in parallel with the outer wall, the airflow is forcibly guided in parallel with the outer wall, so that rapid enlargement is possible. The holding plate has a function of holding and fixing the enlarged guide plate.
【００１４】（２）上記保持板の代りにスパイラル状の
仕切板を設けたものにおいては、気流拡大部の流路長を
延長し、実質的に拡大角を減少させる作用があるので、
外壁の拡大角が大きい急拡大が可能である。(2) In the case where a spiral partition plate is provided instead of the holding plate, it has the effect of extending the flow path length of the air flow expanding portion and substantially reducing the expansion angle.
Large expansion angle of outer wall allows rapid expansion.
【００１５】（３）気流溜り部に防音材を充填し、かつ
拡大案内板を多孔板で構成したものにおいては、気流溜
り部の防音材で外部への音の伝達が防止され、拡大案内
板の多数の孔によって騒音が透過され、減音される。(3) In the case where the airflow reservoir is filled with a soundproof material and the enlarged guide plate is composed of a perforated plate, the soundproof material in the airflow reservoir prevents the transmission of sound to the outside, and the enlarged guide plate. The noise is transmitted and reduced by the large number of holes.
【００１６】（４）拡大案内板を２枚の多孔板から構成
し、一部空洞部を残して防音材を充填したものにおいて
は、騒音の透過減音と共鳴吸音とによって、騒音の低減
が図られる。(4) In the case where the enlarged guide plate is composed of two perforated plates and is filled with the soundproof material with a part of the cavity left, the noise can be reduced by the noise transmission and the sound absorption. Planned.
【００１７】[0017]
【実施例】図１は本発明の第１実施例に係る気流拡大ダ
クトの透視斜視図、図２は同ダクトの縦断面図、図３は
同ダクトの横断面図である。本実施例のダクトの断面は
円形である。図において、Ａ1 は小断面積ダクト、Ａ2
は大断面積ダクト、１は上記両ダクトを接続する気流拡
大ダクトの外壁、２は上記気流拡大ダクトの外壁の内側
に多数設けられている拡大案内板であり、それぞれ下流
に向って拡大した形状のもの、すなわち円錐台の側面と
同じ形のものである。３は上記拡大案内板の間隔を維持
し、かつ同拡大案内板を互に固定するために設けられて
いる保持板である。上記１，２，３を付した部分によっ
て気流拡大ダクトＢが構成されている。この気流拡大ダ
クトＢは拡大角αが７°以上となっており、気流を拡大
案内板２の作用によって急拡大させ、拡大ダクトの全長
Ｌを短縮したものである。なお図１においては、図の繁
雑さを避けるために、保持板３の図示を省略してある。1 is a perspective view of an air flow expanding duct according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the duct, and FIG. 3 is a transverse sectional view of the duct. The duct of this embodiment has a circular cross section. In the figure, A 1 is a small cross-section duct, A 2
Is a large cross-sectional area duct, 1 is an outer wall of the airflow expanding duct that connects the two ducts, and 2 is an expanding guide plate provided inside the outer wall of the airflow expanding duct. The same shape as the side of the truncated cone. Reference numeral 3 is a holding plate provided to maintain the interval between the enlarged guide plates and fix the enlarged guide plates to each other. The air flow expansion duct B is constituted by the portions marked with 1, 2, and 3. The airflow expansion duct B has an expansion angle α of 7 ° or more, and the airflow is rapidly expanded by the action of the expansion guide plate 2 to shorten the overall length L of the expansion duct. In FIG. 1, the holding plate 3 is not shown in order to avoid complexity of the drawing.
【００１８】図４は上記実施例の保持板３の構造を示す
気流拡大ダクトの透視斜視図、図５は保持板の形状を示
す気流拡大ダクトの部分縦断面図、図６は保持板の他の
形状を示す気流拡大ダクトの部分縦断面図である。図４
においては、図の繁雑さを避けるために、一部の保持板
だけが示してある。図４の保持板３は平板製、図５の保
持板３は多孔板（パンチングメタル）製である。図６に
示した保持板は複数の支柱状の板からなる保持板４で構
成されている。なお、隣合う拡大案内板２の間隔Ｄは、
気体の入口側、中間部、出口側いずれも等しい間隔にし
てある。FIG. 4 is a perspective view of an airflow expanding duct showing the structure of the holding plate 3 of the above embodiment, FIG. 5 is a partial vertical sectional view of the airflow expanding duct showing the shape of the holding plate, and FIG. FIG. 4 is a partial vertical cross-sectional view of the airflow expansion duct showing the shape of FIG. FIG.
In Fig. 7, only some of the holding plates are shown in order to avoid complication of the drawing. The holding plate 3 in FIG. 4 is made of a flat plate, and the holding plate 3 in FIG. 5 is made of a perforated plate (punching metal). The holding plate shown in FIG. 6 is composed of a holding plate 4 composed of a plurality of pillar-shaped plates. The distance D between the adjacent enlarged guide plates 2 is
The gas inlet side, the intermediate portion, and the outlet side of the gas are all equally spaced.
【００１９】図７は上記実施例の拡大案内板の先端部に
施された気流剥離防止構造の例であり、（ａ）は翼形断
面部５を形成したもの、（ｂ）は気流に平行となるよう
先端を曲げた部分６を有する例である。FIG. 7 shows an example of an airflow separation prevention structure provided at the tip of the enlarged guide plate of the above embodiment. (A) shows the airfoil cross section 5 formed, and (b) shows parallel to the airflow. In this example, the tip 6 is bent so that
【００２０】本実施例の気流拡大ダクトＢにおいては、
外壁１に平行に設けられた多数の拡大案内板２によっ
て、強制的に流れを外壁１と平行になるよう案内するの
で、剥離を生じることなく流れを７°以上の急角度で拡
大させることができる。また、個々の拡大案内板の先端
には図７に示したような気流剥離防止構造が設けてある
ので、先端部における気流剥離は防止される。このよう
にして剥離を生じることなく気流を急拡大させるので、
気流拡大ダクトＢの全長Ｌ（図２）を短縮し、プラント
における排気ダクト等の占める土地面積を減少させるこ
とができる。In the air flow expansion duct B of this embodiment,
Since the flow is forcibly guided in parallel with the outer wall 1 by the large number of expansion guide plates 2 provided in parallel with the outer wall 1, the flow can be expanded at a steep angle of 7 ° or more without causing separation. it can. Further, since the airflow separation prevention structure as shown in FIG. 7 is provided at the tip of each enlarged guide plate, the airflow separation at the tip portion is prevented. In this way, the airflow is expanded rapidly without peeling,
The total length L (FIG. 2) of the airflow expansion duct B can be shortened, and the land area occupied by the exhaust duct and the like in the plant can be reduced.
【００２１】図８は本発明の第２実施例に係る気流拡大
ダクトの透視斜視図である。本例は、第１実施例よりさ
らに大角度で流れを拡大する場合に用いられるものであ
って、７は拡大案内板の間において、主流方向に対して
スパイラル状に傾斜して設けられた仕切板である。この
仕切板は穴の無い板をひねって取付けられている。本実
施例は流れを円周方向にスパイラル状に案内することに
よって、拡大部の流路の全長を長くし、実質的に拡大角
を減少させたのと同等の効果をもたせたものであり、剥
離を防止しながら大角度で流れを拡大することができ
る。FIG. 8 is a perspective view of an airflow expanding duct according to a second embodiment of the present invention. This example is used when the flow is expanded at a larger angle than that of the first example, and 7 is a partition plate provided between the expansion guide plates in a spiral shape with respect to the mainstream direction. is there. This partition plate is attached by twisting a plate without holes. In this embodiment, by guiding the flow in the circumferential direction in a spiral shape, the total length of the flow path of the expansion portion is lengthened, and the effect equivalent to that of substantially reducing the expansion angle is provided. The flow can be expanded at a large angle while preventing separation.
【００２２】図９は本発明の第３実施例に係る気流拡大
ダクトの透視斜視図、図１０は同ダクトの縦断面図、図
１１は同ダクトの横断面図である。本例は角形断面のダ
クトに関するものであり、気流拡大ダクトの拡大角αは
７°以上である。本例は第１実施例の円形ダクトを角形
ダクトに変えたものであって、外壁および拡大案内板は
角錐台の側面と同じ形のものである。第１実施例と対応
する部分には第１実施例と同じ符号が付してある。FIG. 9 is a perspective view of an air flow expanding duct according to a third embodiment of the present invention, FIG. 10 is a longitudinal sectional view of the duct, and FIG. 11 is a transverse sectional view of the duct. This example relates to a duct having a rectangular cross section, and the expansion angle α of the air flow expansion duct is 7 ° or more. In this example, the circular duct of the first embodiment is changed to a rectangular duct, and the outer wall and the enlarged guide plate have the same shape as the side surface of the truncated pyramid. The parts corresponding to those in the first embodiment are designated by the same reference numerals as those in the first embodiment.
【００２３】図１２は一対の拡大案内板２と保持板３と
で区画される。一つの流路の構成の斜視図である。拡大
案内板はいずれも外壁と平行であり、かつ互いに平行で
ある。図には保持板３は多孔板（パンチングメタル）で
作られていることを示しているが、孔の無い平板でもよ
い。図１３は上記多孔板の代りに支柱状の保持板４が用
いられている例である。また、各拡大案内板の先端は、
図７に示したような気流剥離防止構造が設けられてい
る。また拡大案内板２はいずれも外壁１に平行に設けら
れている。FIG. 12 is divided into a pair of enlarged guide plates 2 and a holding plate 3. It is a perspective view of the structure of one flow path. The enlarged guide plates are both parallel to the outer wall and parallel to each other. Although the holding plate 3 is shown to be made of a perforated plate (punching metal) in the drawing, it may be a flat plate without holes. FIG. 13 shows an example in which a supporting plate 4 having a pillar shape is used instead of the perforated plate. Also, the tip of each enlarged guide plate,
An air flow separation prevention structure as shown in FIG. 7 is provided. Further, all of the enlarged guide plates 2 are provided parallel to the outer wall 1.
【００２４】本実施例の拡大ダクトＢにおいても、外壁
１に平行に設けられた多数の拡大案内板２によって、強
制的に流れを外壁１と平行になるよう案内するので、剥
離を生じることなく流れを７°以上の急角度で拡大させ
ることができる。また、個々の拡大案内板の先端には気
流剥離防止構造が設けてあるので、先端部における気流
剥離は防止される。このようにして剥離を生じることな
く気流を急拡大させるので、拡大ダクトＢの全長Ｌ（図
１０）を短縮し、プラントにおける排気ダクト等の占め
る土地面積を減少させることができる。Also in the expansion duct B of this embodiment, since the flow is forcibly guided in parallel with the outer wall 1 by a large number of expansion guide plates 2 provided in parallel with the outer wall 1, separation does not occur. The flow can be expanded at steep angles above 7 °. Further, since the airflow separation prevention structure is provided at the tip of each of the enlarged guide plates, the airflow separation at the tip portion is prevented. Since the airflow is rapidly expanded without causing separation in this way, the total length L (FIG. 10) of the expansion duct B can be shortened and the land area occupied by the exhaust duct and the like in the plant can be reduced.
【００２５】図１４は本発明の第４実施例に係る気流拡
大ダクトの透視斜視図である。本例は、第３実施例より
さらに大角度で流れを拡大する場合に用いられるもので
あって、７は隣合う拡大案内板の間において、主流方向
に対してスパイラル状に傾斜して設けられた仕切板であ
る。この仕切板は穴の無い板をひねって取付けられてい
る。本実施例は流れを主流方向に傾斜して案内すること
によって、拡大部の流れの全長を長くし、実質的に拡大
角を減少させたのと同等の効果をもたせたものであり、
大角度で流れを拡大させる場合に剥離を防止することが
できる。FIG. 14 is a perspective view of an airflow expanding duct according to a fourth embodiment of the present invention. This example is used when the flow is expanded at a larger angle than that of the third embodiment, and 7 is a partition provided between adjacent expansion guide plates that is spirally inclined with respect to the mainstream direction. It is a plate. This partition plate is attached by twisting a plate without holes. In the present embodiment, by guiding the flow by inclining it in the main flow direction, the total length of the flow in the expansion portion is lengthened, and the effect equivalent to that of substantially reducing the expansion angle is provided.
Separation can be prevented when expanding the flow at a large angle.
【００２６】図１５は本発明の第５実施例に係る気流拡
大ダクトの縦断面図である。図において、Ａ1 は小断面
ダクト、Ａ2 は大断面ダクト、Ｂは気流拡大ダクトであ
る。本実施例は、さきに述べた各種の剥離防止・ダクト
短縮手段を採用した時に、流れ拡大部において生じる騒
音を低減する手段を提供するものである。流れ拡大部の
外壁８は大断面積ダクトＡ2 と同じ断面形の部分と、ダ
クト中心線に直角な平面状部分とからなり、小断面積ダ
クトＡ1 とステップ状に接続されている。９は外壁８の
内側に設けられている多孔板（パンチングメタル）製拡
大案内板である。最外部の拡大案内板は小断面積ダクト
の端部と大断面積ダクトの端部とを直線的に結んだ形状
であり、その内側の複数の拡大案内板は最外側の拡大案
内板に対して平行に設けてある。すなわち、拡大案内板
は、円錐台または角錐台の側面と同じ形のものである。
外壁８と最外部の拡大案内板との間の気流溜り部Ｃには
防音材１２が充填してある。FIG. 15 is a vertical sectional view of an airflow expanding duct according to a fifth embodiment of the present invention. In the figure, A 1 is a small cross section duct, A 2 is a large cross section duct, and B is an air flow expansion duct. The present embodiment provides means for reducing noise generated in the flow expanding portion when the above-mentioned various separation preventing / duct shortening means are adopted. The outer wall 8 of the flow expanding portion is composed of a portion having the same cross-sectional shape as the large cross-sectional area duct A 2 and a flat portion perpendicular to the duct center line, and is connected to the small cross-sectional area duct A 1 stepwise. Reference numeral 9 denotes an enlarged guide plate made of a perforated plate (punching metal) provided inside the outer wall 8. The outermost expansion guide plate has a shape in which the end of the small cross-sectional area duct and the end of the large cross-sectional area duct are linearly connected, and the plurality of expansion guide plates inside the outer expansion guide plate are different from the outermost expansion guide plate. Parallel to each other. That is, the enlarged guide plate has the same shape as the side surface of the truncated cone or the truncated pyramid.
A soundproof material 12 is filled in the airflow reservoir C between the outer wall 8 and the outermost enlarged guide plate.
【００２７】本実施例においては拡大案内板を多孔板で
形成したことによって、騒音は透過されて減音され防音
効果を上げることができる。In the present embodiment, since the enlarged guide plate is formed of the perforated plate, the noise is transmitted and reduced so that the soundproof effect can be enhanced.
【００２８】図１６は本発明の第６実施例に係る気流拡
大ダクトの縦断面図である。本実施例は、流れの中に防
音材入りの拡大案内板１０を設けた例である。これは拡
大案内板を、それぞれ近接した２枚の多孔板（パンチン
グメタル）１１によって形成し、その間に、部分的に空
洞部１３を残して、防音材１２を充填したものである。
本例の最外部の拡大案内板９は第５実施例のものと同様
な一重の多孔板であり、外壁８との間の気流溜り部Ｃに
は防音材１１が充填してある。FIG. 16 is a vertical sectional view of an air flow expanding duct according to a sixth embodiment of the present invention. This embodiment is an example in which an enlarged guide plate 10 containing a soundproof material is provided in the flow. This is one in which an enlarged guide plate is formed by two perforated plates (punching metal) 11 that are adjacent to each other, and a soundproof material 12 is filled in between them with a hollow portion 13 partially left.
The outermost expansion guide plate 9 of this example is a single porous plate similar to that of the fifth embodiment, and the airflow reservoir C between the outer wall 8 and the outer wall 8 is filled with a soundproof material 11.
【００２９】図１７は上記実施例における拡大案内板の
２枚の多孔板１１間における防音材と空洞部の多様な設
け方を示す断面図、図１８はその部分の平面図、図１９
はその部分の斜視図である。これらは各種の共鳴室の構
成例を示すものである。図１７において１４は多孔板１
１の孔、１５は仕切部材、１６は２枚の多孔板の孔が向
き合っている場合の孔であって、気体通過孔である。仕
切部材１５によって仕切られた各小室は共鳴室であり、
共鳴吸音の作用をする室である。これらの室は、一方の
壁の小さい室１７、両壁が開口された分割小室１８、全
隙間使用の両開口１９、全隙間使用の片開口２０、全隙
間使用の大空間片開口２１等である。また図１８におい
て、共鳴室は、円形室２２、異形室２３、及び矩形室２
４等に別けられている。FIG. 17 is a sectional view showing various ways of providing a soundproof material and a cavity between two perforated plates 11 of the enlarged guide plate in the above embodiment, FIG. 18 is a plan view of that portion, and FIG.
Is a perspective view of the portion. These show structural examples of various resonance chambers. In FIG. 17, 14 is a perforated plate 1.
1 is a hole, 15 is a partition member, 16 is a hole when the holes of the two perforated plates face each other, and is a gas passage hole. Each small chamber partitioned by the partition member 15 is a resonance chamber,
It is a room that acts as a resonant sound absorber. These chambers include a small chamber 17 with one wall, a small divided chamber 18 with both walls open, both openings 19 with all gaps, one opening 20 with all gaps, and a large space one opening 21 with all gaps. is there. Further, in FIG. 18, the resonance chamber includes a circular chamber 22, a deformed chamber 23, and a rectangular chamber 2.
It is divided into 4 mag.
【００３０】本実施例においては、拡大案内板を２枚の
多孔板で構成し、間隙内に防音材充填部と充填しない部
分を設けたことによって充填部は消音効果を上げ、充填
しない部分の空洞部は、特定の周波数の共鳴吸音を促
す。また最も外側の拡大案内板と気流拡大ダクト外壁の
間に形成される気流溜り部も共鳴室としたことにより主
流の流れの出入りにより境界層がコントロールされ特定
周波数の騒音を減音する。本実施例はこれらの作用によ
って流れ拡大部の長さを減少させると共に騒音の低減を
図ることができる。In this embodiment, the enlarged guide plate is composed of two perforated plates, and the soundproof material filling portion and the non-filling portion are provided in the gap, so that the filling portion enhances the sound deadening effect and the non-filling portion. The cavity promotes resonant sound absorption of a specific frequency. Further, the airflow reservoir formed between the outermost expansion guide plate and the outer wall of the airflow expansion duct is also a resonance chamber, so that the boundary layer is controlled by the inflow and outflow of the mainstream to reduce noise of a specific frequency. According to the present embodiment, these actions can reduce the length of the flow expanding portion and reduce noise.
【００３１】[0031]
【発明の効果】本発明の気流拡大ダクトにおいては、互
いに向き合う小断面積ダクトの端部と大断面積ダクトの
端部を直線的に結んで接続する錐台側面形状の外壁、同
外壁の内側において同外壁に平行に設置されその上流端
が流路中心部のものほど下流側に後退した位置に設けら
れている複数の錐台側面形状の拡大案内板、及び同複数
の拡大案内板の間において流れの方向に沿って設けられ
同拡大案内板の間隔を維持しかつそれらを相互に固定す
る平板製、多孔板製又は支柱状の保持板とからなり、あ
るいは上記保持板の代わりに、複数の拡大案内板の互い
に隣合うものの間において気流拡大ダクトの中心線に対
してスパイラル状に設けられ同拡大案内板の間隔を維持
しかつそれらを相互に固定する仕切板が設けられている
ので、気流剥離を生じることなくダクトの全長を短くす
ることができ、プラントにおけるダクトが占有する面積
を短縮することができる。In the air flow expansion duct of the present invention, the outer wall of the frustum side shape which connects the ends of the small cross-sectional area duct and the large cross-sectional area duct facing each other linearly, and the inside of the outer wall. In this case, a plurality of frustum side surface-shaped enlarged guide plates are installed in parallel with the outer wall, and the upstream end of the enlarged guide plates is located at a position receding toward the downstream side toward the central part of the flow path, and the flow between the plurality of enlarged guide plates. A flat plate, a perforated plate, or a column-shaped holding plate that maintains the interval between the enlarged guide plates and fixes them to each other, or instead of the holding plates, a plurality of enlarged plates are provided. Since the partition plates are provided between adjacent ones of the guide plates in a spiral shape with respect to the center line of the air flow expansion duct and maintain the space between the expansion guide plates and fix them to each other, air flow separation To The total length of the duct can be shortened without Jill can duct in the plant to reduce the area occupied.
【００３２】また、本発明の他の気流拡大ダクトにおい
ては、大断面積ダクトと同一断面形状の部分並びに同部
分と小断面積ダクトとをステップ状に接続する平板状部
分から構成された外壁、小断面積ダクトの端部と大断面
積ダクトの端部を直線的に結んで接続する錐台側面形状
の最外部の拡大案内板、同最外部の拡大案内板の内側に
おいて同最外部の拡大案内板に平行に設置されその上流
端が流路中心部のものほど下流側に後退した位置に設け
られている複数の錐台側面形状の拡大案内板、及び同複
数の拡大案内板の間において流れの方向に沿って設けら
れ同拡大案内板の間隔を維持しかつそれらを相互に固定
する保持板とからなり、上記各拡大案内板が多孔板から
なり、かつ上記外壁と最外部の拡大案内板との間に防音
材が充填されており、あるいは、上記最外部の拡大案内
板を除く個々の拡大案内板が、近接して設けられた一対
の多孔板と同一対の多孔板の間に部分的に空洞部を残し
て充填された防音材とから構成されているので、ダクト
全長の短縮を可能にし、かつ騒音の発生を防止すること
ができる。Further, in another air flow expanding duct of the present invention, an outer wall composed of a portion having the same cross-sectional shape as the large cross-sectional area duct and a flat plate-like portion connecting the same portion and the small cross-sectional area duct in a stepwise manner, The outermost expansion guide plate of the frustum side shape that connects the ends of the small cross-section duct and the end of the large cross-section duct linearly, and the expansion of the outermost expansion inside the outermost expansion guide plate A plurality of frustum-sided enlarged guide plates that are installed parallel to the guide plate and that are arranged at positions where their upstream ends are closer to the center of the flow path and are set back toward the downstream side, and the flow of flow between the plurality of enlarged guide plates. And a holding plate that is provided along the direction and that maintains the distance between the enlarged guide plates and fixes them to each other, each of the enlarged guide plates includes a perforated plate, and the outer wall and the outermost enlarged guide plate. There is a soundproof material filled between Alternatively, the individual expansion guide plates other than the outermost expansion guide plate are a soundproof material filled with a pair of perforated plates provided close to each other and a cavity partially left between the same pair of perforated plates. Since it is composed of, the total length of the duct can be shortened and the generation of noise can be prevented.
【図１】本発明の第１実施例に係る気流拡大ダクトの透
視斜視図。FIG. 1 is a perspective view of an airflow expansion duct according to a first embodiment of the present invention.
【図２】上記実施例の気流拡大ダクトの縦断面図。FIG. 2 is a vertical cross-sectional view of the airflow expansion duct of the above embodiment.
【図３】上記実施例の気流拡大ダクトの横断面図。FIG. 3 is a cross-sectional view of the airflow expansion duct of the above embodiment.
【図４】上記実施例の保持板を示す透視斜視図。FIG. 4 is a perspective view showing a holding plate of the above embodiment.
【図５】上記実施例の保持板の構造を示す流れ拡大部の
部分縦断面図。FIG. 5 is a partial vertical cross-sectional view of a flow expanding portion showing the structure of the holding plate of the above embodiment.
【図６】上記実施例における保持板の他の形状を示す流
れ拡大部の部分縦断面図。FIG. 6 is a partial vertical cross-sectional view of a flow expanding portion showing another shape of the holding plate in the above embodiment.
【図７】上記実施例における拡大案内板の気流剥離防止
構造を示す断面図。FIG. 7 is a cross-sectional view showing an airflow separation prevention structure for an enlarged guide plate in the above embodiment.
【図８】本発明の第２実施例に係る気流拡大ダクトの透
視斜視図。FIG. 8 is a perspective view of an airflow expansion duct according to a second embodiment of the present invention.
【図９】本発明の第３実施例に係る気流拡大ダクトの透
視斜視図。FIG. 9 is a perspective view of an airflow expansion duct according to a third embodiment of the present invention.
【図１０】上記実施例の気流拡大ダクトの縦断面図。FIG. 10 is a vertical cross-sectional view of the airflow expansion duct of the above embodiment.
【図１１】上記実施例の気流拡大ダクトの横断面図。FIG. 11 is a cross-sectional view of the airflow expansion duct of the above embodiment.
【図１２】上記実施例における一つの流路の構成の斜視
図。FIG. 12 is a perspective view of the structure of one flow path in the above-described embodiment.
【図１３】上記実施例における他の一つの流路の構成の
斜視図。FIG. 13 is a perspective view of the configuration of another one flow path in the above embodiment.
【図１４】本発明の第４実施例に係る気流拡大ダクトの
透視斜視図。FIG. 14 is a perspective view of an airflow expansion duct according to a fourth embodiment of the present invention.
【図１５】本発明の第５実施例に係る気流拡大ダクトの
縦断面図。FIG. 15 is a vertical sectional view of an airflow expansion duct according to a fifth embodiment of the present invention.
【図１６】本発明の第６実施例に係る気流拡大ダクトの
縦断面図。FIG. 16 is a vertical sectional view of an airflow expanding duct according to a sixth embodiment of the present invention.
【図１７】上記実施例における拡大案内板の部分縦断面
図。FIG. 17 is a partial vertical sectional view of the enlarged guide plate in the above embodiment.
【図１８】上記実施例における拡大案内板の部分平面
図。FIG. 18 is a partial plan view of the enlarged guide plate in the above embodiment.
【図１９】上記実施例における拡大案内板の部分斜視
図。FIG. 19 is a partial perspective view of the enlarged guide plate in the above embodiment.
【図２０】従来の気流拡大ダクトの縦断面図。FIG. 20 is a vertical cross-sectional view of a conventional airflow expansion duct.
【図２１】従来の気流拡大ダクトにおける流れの説明
図。FIG. 21 is an explanatory diagram of a flow in a conventional air flow expansion duct.
Ａ1 小断面積ダクト Ａ2 大断面積ダクト Ａ3 気流拡大ダクト（従来） Ｂ 気流拡大ダクト（本発明） Ｃ 気流溜り部 １ 外壁 ２ 拡大案内板 ３ 保持板 ４ 支柱状保持板 ５ 翼形断面部 ６ 曲げてある部分 ７ 仕切板（保持板兼用） ８ 外壁 ９ 拡大案内板（多孔板製） １０ 拡大案内板（防音材入り） １１ 多孔板 １２ 防音材 １３ 空洞部 １４ 孔 １５ 仕切部材 １６ 気体通過孔A 1 Small cross-sectional area duct A 2 Large cross-sectional area duct A 3 Airflow expansion duct (conventional) B Airflow expansion duct (present invention) C Airflow reservoir 1 Outer wall 2 Expansion guide plate 3 Holding plate 4 Strut-shaped holding plate 5 Wing section Part 6 Bent part 7 Partition plate (also used as a holding plate) 8 Outer wall 9 Expansion guide plate (made of perforated plate) 10 Expansion guide plate (with soundproof material) 11 Perforated plate 12 Sound insulation material 13 Cavity part 14 Hole 15 Partition member 16 Gas Passage hole
Claims (4)
続部に設けられる気流拡大ダクトにおいて、互いに向き
合う小断面積ダクトの端部と大断面積ダクトの端部を直
線的に結んで接続する錐台側面形状の外壁、同外壁の内
側において同外壁に平行に設置されその上流端が流路中
心部のものほど下流側に後退した位置に設けられている
複数の錐台側面形状の拡大案内板、及び同複数の拡大案
内板の間において流れの方向に沿って設けられ同拡大案
内板の間隔を維持しかつそれらを相互に固定する平板
製、多孔板製又は支柱状の保持板とからなることを特長
とする気流拡大ダクト。1. An air flow expansion duct provided at a connecting portion between a small cross-section area duct and a large cross-section area duct, wherein an end of the small cross-section area duct and an end of the large cross-section area duct which are facing each other are linearly connected to each other. The outer surface of the frustum side surface, which is parallel to the outer wall inside the outer wall, and the upstream end of which is located closer to the central part of the flow path is provided at a position retracted to the downstream side. A guide plate and a flat plate, a perforated plate, or a column-shaped holding plate that is provided along the flow direction between the plurality of enlarged guide plates to maintain the gap between the enlarged guide plates and fix them to each other. An air flow expansion duct that features that.
板の互いに隣合うものの間において気流拡大ダクトの中
心線に対してスパイラル状に設けられ同拡大案内板の間
隔を維持しかつそれらを相互に固定する仕切板が設けら
れていることを特長とする請求項１に記載の気流拡大ダ
クト。2. Instead of the holding plate, a spiral shape is provided between adjacent ones of the plurality of expansion guide plates with respect to the center line of the air flow expansion duct to maintain the intervals of the expansion guide plates and The airflow expansion duct according to claim 1, further comprising partition plates that are fixed to each other.
続部に設けられる気流拡大ダクトにおいて、大断面積ダ
クトと同一断面形状の部分並びに同部分と小断面積ダク
トとをステップ状に接続する平板状部分から構成された
外壁、小断面積ダクトの端部と大断面積ダクトの端部を
直線的に結んで接続する錐台側面形状の最外部の拡大案
内板、同最外部の拡大案内板の内側において同最外部の
拡大案内板に平行に設置されその上流端が流路中心部の
ものほど下流側に後退した位置に設けられている複数の
錐台側面形状の拡大案内板、及び同複数の拡大案内板の
間において流れの方向に沿って設けられ同拡大案内板の
間隔を維持しかつそれらを相互に固定する保持板とから
なり、上記各拡大案内板が多孔板からなり、かつ上記外
壁と最外部の拡大案内板との間に防音材が充填されてい
ることを特長とする気流拡大ダクト。3. An air flow expansion duct provided at a connecting portion between a small cross-section area duct and a large cross-section area duct, and a portion having the same cross-sectional shape as the large cross-section area duct and the same portion and the small cross-section area duct are connected in a step shape. An outer wall composed of flat plate-shaped parts, an outermost expansion guide plate in the shape of a truncated cone that connects the ends of the small cross-section area duct and the end of the large cross-section area duct linearly, and expansion of the outermost area Inside the guide plate, a plurality of frustum side surface-shaped enlargement guide plates are installed in parallel with the outermost enlargement guide plates, and the upstream ends of the guide plates are recessed toward the downstream side. And a holding plate that is provided along the flow direction between the plurality of enlarged guide plates to maintain the interval between the enlarged guide plates and fix them to each other, and each of the enlarged guide plates is a perforated plate, and Expansion plan for the outer wall and outermost part An air flow expansion duct characterized by being filled with a soundproof material between the inner plate and the inner plate.
大案内板が、近接して設けられた一対の多孔板と同一対
の多孔板の間に部分的に空洞部を残して充填された防音
材とから構成されていることを特長とする請求項３に記
載の気流拡大ダクト。4. A soundproofing device in which the individual expansion guide plates except the outermost expansion guide plate are filled with a pair of perforated plates provided close to each other and a cavity partially left between the same pair of perforated plates. The airflow expansion duct according to claim 3, characterized in that it is made of a material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18122394A JPH0842521A (en) | 1994-08-02 | 1994-08-02 | Air current expanding duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18122394A JPH0842521A (en) | 1994-08-02 | 1994-08-02 | Air current expanding duct |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0842521A true JPH0842521A (en) | 1996-02-13 |
Family
ID=16096971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18122394A Withdrawn JPH0842521A (en) | 1994-08-02 | 1994-08-02 | Air current expanding duct |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0842521A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008025564A (en) * | 2006-07-19 | 2008-02-07 | Waertsilae Schweiz Ag | Composite diffusion device for reciprocating piston combustion engine and reciprocating piston combustion engine |
| JP2010019453A (en) * | 2008-07-09 | 2010-01-28 | Dai-Dan Co Ltd | Humidification unit installation duct |
| CN103316559A (en) * | 2013-07-03 | 2013-09-25 | 中国环境科学研究院 | Large-scale airflow distribution device |
| JP2015124131A (en) * | 2013-12-27 | 2015-07-06 | 日本電気硝子株式会社 | Molten glass feeding apparatus and glass plate manufacturing apparatus |
| CN113029577A (en) * | 2021-03-23 | 2021-06-25 | 中国空气动力研究与发展中心空天技术研究所 | Expansion section for planar cascade flow simulation device |
-
1994
- 1994-08-02 JP JP18122394A patent/JPH0842521A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008025564A (en) * | 2006-07-19 | 2008-02-07 | Waertsilae Schweiz Ag | Composite diffusion device for reciprocating piston combustion engine and reciprocating piston combustion engine |
| KR101338280B1 (en) * | 2006-07-19 | 2013-12-09 | 베르트질레 슈바이츠 악티엔게젤샤프트 | A multiple diffuser for a reciprocating piston combustion engine, and a reciprocating piston combustion engine |
| JP2010019453A (en) * | 2008-07-09 | 2010-01-28 | Dai-Dan Co Ltd | Humidification unit installation duct |
| CN103316559A (en) * | 2013-07-03 | 2013-09-25 | 中国环境科学研究院 | Large-scale airflow distribution device |
| JP2015124131A (en) * | 2013-12-27 | 2015-07-06 | 日本電気硝子株式会社 | Molten glass feeding apparatus and glass plate manufacturing apparatus |
| CN113029577A (en) * | 2021-03-23 | 2021-06-25 | 中国空气动力研究与发展中心空天技术研究所 | Expansion section for planar cascade flow simulation device |
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| A300 | Withdrawal of application because of no request for examination |
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