JPS6333017Y2 - - Google Patents
Info
- Publication number
- JPS6333017Y2 JPS6333017Y2 JP13991784U JP13991784U JPS6333017Y2 JP S6333017 Y2 JPS6333017 Y2 JP S6333017Y2 JP 13991784 U JP13991784 U JP 13991784U JP 13991784 U JP13991784 U JP 13991784U JP S6333017 Y2 JPS6333017 Y2 JP S6333017Y2
- Authority
- JP
- Japan
- Prior art keywords
- gap
- labyrinth seal
- flexible body
- rotating
- leakage
- 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.)
- Expired
Links
- 238000007789 sealing Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案はターボ回転機械に応用できるラビリン
スを利用したシール機構に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sealing mechanism using a labyrinth that can be applied to turbo rotating machines.
（従来技術）
第６図は従来の蒸気タービンや空気圧縮機のよ
うなターボ回転機械に用いられるラビリンスシー
ルの断面図である。ラビリンスシール０１は回転
軸０２と僅かな隙間ｈを隔ててケーシング０３に
セツトされており、この隙間を常に維持すべく、
ラビリンスシールの背面は板ばね等の弾性体０４
で回転軸方向に押し付けられている。(Prior Art) FIG. 6 is a sectional view of a labyrinth seal used in a conventional turbo rotating machine such as a steam turbine or an air compressor. The labyrinth seal 01 is set in the casing 03 with a small gap h between it and the rotating shaft 02, and in order to always maintain this gap,
The back of the labyrinth seal is an elastic body such as a leaf spring 04
is pressed in the direction of the rotation axis.
ラビリンスシール０１の目的は、作動流体の高
圧側PHから低圧側PLへの漏れを少なくすること
であり、この為には隙間ｈは極力狭いことが望ま
しい。しかしながら、一般の回転機械では、定格
速度にまで昇速する過程において危険速度を通過
し、この時点では回転軸０２の半径方向振動が大
きくなる為、この隙間は余り狭くすることが出来
ないのが実状である。その為、定格速度において
この隙間ｈを通過する漏れ量が比較的多く、ター
ボ機械の効率を低下させる要因の１つになつてい
た。 The purpose of the labyrinth seal 01 is to reduce leakage of working fluid from the high pressure side PH to the low pressure side PL, and for this purpose, it is desirable that the gap h be as narrow as possible. However, in general rotating machines, the critical speed is passed during the process of increasing the speed to the rated speed, and at this point the radial vibration of the rotating shaft 02 becomes large, so this gap cannot be made very narrow. This is the actual situation. Therefore, at the rated speed, the amount of leakage passing through the gap h is relatively large, which is one of the factors that reduce the efficiency of the turbomachine.
（考案が解決しようとする問題点）
本考案は、従来の定格速度において隙間ｈを通
過する漏れ量が比較的多く、ターボ機械の効率を
低下させる等の問題点を解決しようとするもので
ある。(Problems to be solved by the invention) The invention attempts to solve problems such as the relatively large amount of leakage passing through the gap h at conventional rated speeds, which reduces the efficiency of turbomachinery. .
（問題点を解決するための手段）
このため本考案は、回転体のラビリンスシール
に対峙する位置に、同回転体の軸半径方向外側に
可撓性の可撓体を取付けた構成としてなるもので
ある。(Means for solving the problem) Therefore, the present invention has a structure in which a flexible body is attached to the outside in the radial direction of the axis of the rotating body at a position facing the labyrinth seal of the rotating body. It is.
（作用）
回転体に可撓体をはめ込み、この可撓体が遠心
力により半径方向外側に撓むことを利用し、昇速
又は減速時は広い隙間を形成し、回転体とラビリ
ンスシールとの直接接触を避け、定格速度では狭
い隙間とすることにより、漏れ量を低減できる。(Function) A flexible body is fitted into the rotating body, and by utilizing the fact that this flexible body bends outward in the radial direction due to centrifugal force, a wide gap is formed when speeding up or decelerating, and the gap between the rotating body and the labyrinth seal is By avoiding direct contact and creating a narrow gap at rated speed, the amount of leakage can be reduced.
（実施例）
以下本考案の実施例を図面について説明する
と、第１図〜第５図は本考案の実施例を示す。さ
て第１図、第２図の第１実施例において、ラビリ
ンスシール１が板ばね等の弾性体４で回転軸方向
に押し付けられてケーシング３に取付けられてい
る構造は、第６図と同じである。そして、シール
すべき場所の回転軸２には、断面がコ字形をした
可撓体５が回転軸２ときつい接合状態で取り付け
られている。(Example) Examples of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show examples of the present invention. Now, in the first embodiment shown in FIGS. 1 and 2, the structure in which the labyrinth seal 1 is attached to the casing 3 by being pressed in the rotational axis direction by an elastic body 4 such as a leaf spring is the same as in FIG. 6. be. A flexible body 5 having a U-shaped cross section is attached to the rotary shaft 2 at a location to be sealed in a tightly joined state.
第１図は回転が遅い場合であり、可撓体５に働
く遠心力は小さい為、可撓体５は殆ど撓むことが
無く、可撓体５とラビリンスシール１との隙間ｈ
は広く、危険速度通過時においても両者の直接接
触を避けることが出来る。 FIG. 1 shows a case where the rotation is slow and the centrifugal force acting on the flexible body 5 is small, so the flexible body 5 hardly bends, and the gap h between the flexible body 5 and the labyrinth seal 1
is wide, and direct contact between the two can be avoided even when passing at critical speeds.
そして、定格速度に近づくにつれ、可撓体５の
遠心力による撓みは大きくなり、第２図のように
可撓体５とラビリンスシール１との隙間ｈは狭く
なり、作動流体の漏れ量を少なくすることが出来
る。 As the rated speed approaches, the deflection of the flexible body 5 due to centrifugal force increases, and the gap h between the flexible body 5 and the labyrinth seal 1 narrows as shown in Figure 2, reducing the amount of leakage of the working fluid. You can.
なお、可撓体５の撓みは遠心力に依つている
が、第２図のように可撓体５の自由端側を高圧側
PH、固定端側を低圧側PLになるように配置すれ
ば、作動流体のガス圧力による撓みをも利用する
ことが出来る。また、可撓体５の断面形状、配置
として、第３図及至第５図のような可撓体５ａ，
５ｂ，５ｃにすれば、第１図および第２図に比べ
最小隙間ｈなる段数が増え、シール効果が大きく
なる。なお、前述の実施例では、適用箇所は回転
軸としているが、動翼に対しても実施できる。 Note that the deflection of the flexible body 5 depends on centrifugal force, but as shown in FIG.
By arranging the PH and fixed end side to be the low pressure side PL, it is possible to utilize the deflection caused by the gas pressure of the working fluid. In addition, the cross-sectional shape and arrangement of the flexible body 5 are as shown in FIGS. 3 to 5.
5b and 5c, the number of stages corresponding to the minimum gap h increases compared to FIGS. 1 and 2, and the sealing effect becomes greater. In the above-mentioned embodiment, the application point is the rotating shaft, but it can also be applied to the rotor blade.
（考案の効果）
以上詳細に説明した如く本考案は構成されてい
るので、定格速度に近づくにつれ、可撓体の遠心
力による撓みは大きくなり、可撓体とラビリンス
シールとの隙間は狭くなり、作動流体の漏れ量を
少なくすることができる。(Effects of the invention) Since the present invention is constructed as explained in detail above, as the rated speed approaches, the deflection of the flexible body due to centrifugal force increases, and the gap between the flexible body and the labyrinth seal narrows. , the amount of leakage of working fluid can be reduced.
第１図及び第２図は本考案の実施例を示す夫々
作動状態を異にするシール機構の側断面図、第３
図、第４図及び第５図は夫々第１図と異なる実施
例を示すシール機構の側断面図、第６図は従来の
ラビリンスシールを用いたシール機構の側断面図
である。
図の主要部分の説明、１……ラビリンスシー
ル、２……回転軸（回転体）、３……ケーシング、
５……可撓体。
1 and 2 are side sectional views of sealing mechanisms in different operating states, respectively, showing embodiments of the present invention;
4 and 5 are side sectional views of a sealing mechanism showing different embodiments from FIG. 1, respectively, and FIG. 6 is a side sectional view of a sealing mechanism using a conventional labyrinth seal. Explanation of the main parts of the diagram, 1... Labyrinth seal, 2... Rotating shaft (rotating body), 3... Casing,
5...Flexible body.
Claims (1)
同回転体の軸半径方向外側に可撓性の可撓体を取
付けたことを特徴とするシール機構。 At the position facing the labyrinth seal of the rotating body,
A sealing mechanism characterized in that a flexible body is attached to the outside of the rotating body in the radial direction of the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13991784U JPS6333017Y2 (en) | 1984-09-14 | 1984-09-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13991784U JPS6333017Y2 (en) | 1984-09-14 | 1984-09-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6154556U JPS6154556U (en) | 1986-04-12 |
| JPS6333017Y2 true JPS6333017Y2 (en) | 1988-09-02 |
Family
ID=30698277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13991784U Expired JPS6333017Y2 (en) | 1984-09-14 | 1984-09-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6333017Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2565380Y2 (en) * | 1991-09-11 | 1998-03-18 | エヌオーケー株式会社 | Non-contact seal |
| JP4643228B2 (en) * | 2004-11-04 | 2011-03-02 | 株式会社東芝 | Shaft seal |
| JP2013177866A (en) * | 2012-02-29 | 2013-09-09 | Hitachi Ltd | Turbomachine |
-
1984
- 1984-09-14 JP JP13991784U patent/JPS6333017Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6154556U (en) | 1986-04-12 |
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