JP3573226B2 - Free blow tool for main steam piping - Google Patents
Free blow tool for main steam piping Download PDFInfo
- Publication number
- JP3573226B2 JP3573226B2 JP10305695A JP10305695A JP3573226B2 JP 3573226 B2 JP3573226 B2 JP 3573226B2 JP 10305695 A JP10305695 A JP 10305695A JP 10305695 A JP10305695 A JP 10305695A JP 3573226 B2 JP3573226 B2 JP 3573226B2
- Authority
- JP
- Japan
- Prior art keywords
- blow
- packing
- free
- tool
- free blow
- 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 - Lifetime
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Description
【0001】
【産業上の利用分野】
この発明は、蒸気タービンの主蒸気配管内の異物を除去するためにフリーブローを行う主蒸気配管のフリーブロー工具に関する。
【0002】
【従来の技術】
主蒸気配管内の異物を除去するとき、主蒸気止め弁の弁ケーシングから可動部を取り外し、蒸気タービン側へ蒸気が流れないようにする図示しない止め金と、弁ケーシングの面に向かってパッキンを押し当て、フリーブロー配管へ流れるブロー蒸気が漏れないようにするフリーブロー工具とを弁ケーシングに取り付ける。主蒸気配管から弁ケーシングへ流入する蒸気は、弁ケーシングを通ってブロー配管へ流れ、その際主蒸気配管内の異物は除去される。
図3は従来のフリーブロー工具を取り付けた弁ケーシングの断面図である。図3において、ブロー配管1を弁ケーシング2に取り付けるとき、パッキン4を弁ケーシング2とフリーブロー工具3との間に挟んで、ネジリング5のネジをブロー配管1のネジと係合させて締付けている。
このため、蒸気ブローによるブロー配管1の熱応力による過大な負荷によってパッキン4が弾性を失って気密力を喪失し、蒸気がフリーブロー工具3から漏れることがあった。また、ブロー配管1の熱応力がパッキン4に影響しないようにブロー配管1を個々に設けていたので、ブロー配管1の本数を増やさなければならないので、スペースを要しかつコスト高となっていた。
図4は図3のIV部拡大断面図である。図4において弁ケーシング2とフリーブロー工具3との間にパッキン4を挟んでフリーブロー工具3の面で押していた。
【0003】
【発明が解決しようとする課題】
従来のフリーブロー工具は、ブロー配管の熱応力の影響をそのまま受ける構造のため、パッキンが伸びて機能を喪失し、蒸気漏れの原因となっていた。また、ブロー配管を用途毎に設けたためコストアップとなっていた。
【0004】
この発明はフリーブロー作業中の蒸気漏れをなくし、フリーブロー作業を円滑に行いかつブロー配管の簡素化を図るフリーブロー工具を提供することを目的とする。
【0005】
【課題を解決するための手段】
蒸気タービンの主蒸気配管の異物除去のためにフリーブローを行うとき、弁ケーシング内に取り付けられ、前記弁ケーシングの面に向かってパッキンを押し当て、ブロー配管へ流れるブロー蒸気の漏れをシールするフリーブロー工具において、前記フリーブロー工具の前記パッキンと接する面に削られ、前記パッキンを嵌め合わせて締め付けたとき弾性限界内の締代となる環状の溝を設けたことによって、上記目的を達成する。
【0006】
【作用】
この発明においては、フリーブロー工具のパッキンと接する面に削られ、パッキンを嵌め合わせて締め付けたとき弾性限界内の締代となる環状の溝を設けたので、弁ケーシング内でパッキンを挟んでフリーブロー工具を当て、ネジリングで締め付けたとき、パッキンの締代分はパッキンを押圧するが、ブロー配管の熱応力が締代分以上にパッキンに加わることがない。
【0007】
【実施例】
図1(A)はこの発明の実施例によるフリーブロー工具備えた弁ケーシングの断面図、(B)は(A)のB部のパッキン締付前の状態を示す拡大断面図、(C)は(B)のパッキン締付後の状態を示す拡大断面図である。図1(A),(B),(C)において図3と同じ部位は同じ符号を付してある。
図1(A)においてブロー配管1に弁ケーシング2を取り付けるとき、パッキン4を弁ケーシング2とフリーブロー工具3との間に挟んで、ネジリング5のネジをブロー配管1のネジと係合させて締め付ける。
その際、図1(B)に示すごとく、フリーブロー工具3のパッキン4と接する面に削られ、パッキンを嵌め合わせて締め付けたとき弾性限界内の締代6となる環状の溝3aを設けた。ネジリング5を締め付けると、図1(C)のごとくフリーブロー工具の端面は弁ケーシング2の面に当たり、それ以上はパッキン4を圧縮することがない。
図2はパッキンの撓みと締付力との関係を示す線図で、斜線を施した範囲は、撓みと締付力とが比例する弾性限界を示す。この弾性限界以上にパッキンを締め付けると締付力を除いても撓みは零に戻らなくなる。しかしこの発明においては、パッキンの締付けはこの斜線内で行われるからパッキンが気密性を喪失して蒸気漏れとなる恐れはない。
【0008】
【発明の効果】
この発明によれは、フリーブロー工具のパッキンと接する面に削られ、パッキンを嵌め合わせて締め付けたとき弾性限界内の締代となる環状の溝を設けたので、フリーブロー工具を取り付けてパッキンを締め付ければ、ブロー配管の熱応力がパッキンの締代以上にパッキンに作用することがなくなり、フリーブロー作業中に蒸気漏れを起こすことはなくなる。
ブロー配管の許容モーメントのみを指示すれば、パッキンへの熱応力による負荷を予想することなくフリーブロー工具を取り付けることができるので、ブロー配管を簡素化することができる。
【図面の簡単な説明】
【図1】(A)はこの発明の実施例によるフリーブロー工具を備えた弁ケーシングの断面図、(B)は(A)のB部のパッキン締付前の状態を示す拡大断面図、(C)は(B)のパッキン締付後の状態を示す拡大断面図である。
【図2】パッキンの撓みと締付力との関係を示す線図である。
【図3】従来のフリーブロー工具を備えた弁ケーシングの断面図である。
【図4】図3のIV部拡大断面図である。
【符号の説明】
1 ブロー配管
2 弁ケーシング
3 フリーブロー工具
3a 溝
4 パッキン
5 ネジリング
6 パッキン締代[0001]
[Industrial applications]
BACKGROUND OF THE
[0002]
[Prior art]
When removing foreign matter in the main steam pipe, remove the movable part from the valve casing of the main steam stop valve, and install a stopper (not shown) that prevents steam from flowing to the steam turbine side, and packing toward the surface of the valve casing. Attach a free blow tool to the valve casing to prevent the blow steam flowing to the free blow pipe from leaking. The steam flowing from the main steam pipe into the valve casing flows through the valve casing to the blow pipe, where foreign matter in the main steam pipe is removed.
FIG. 3 is a sectional view of a valve casing to which a conventional free blow tool is attached. In FIG. 3, when the
For this reason, the packing 4 loses elasticity due to an excessive load due to the thermal stress of the
FIG. 4 is an enlarged sectional view of a portion IV in FIG. In FIG. 4, the packing 4 is sandwiched between the
[0003]
[Problems to be solved by the invention]
Since the conventional free blow tool has a structure that is directly affected by the thermal stress of the blow pipe, the packing expands and loses its function, causing steam leakage. In addition, the cost is increased because the blow pipe is provided for each application.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a free blow tool which eliminates steam leakage during a free blow operation, performs a smooth free blow operation, and simplifies a blow pipe.
[0005]
[Means for Solving the Problems]
When performing free blow to remove foreign matter from the main steam pipe of a steam turbine, a free blow is installed in a valve casing and presses a packing toward a surface of the valve casing to seal a leak of blow steam flowing to the blow pipe. In the blow tool, the above object is achieved by providing an annular groove which is cut off on a surface of the free blow tool which comes into contact with the packing, and which has an interference within an elastic limit when the packing is fitted and tightened.
[0006]
[Action]
In the present invention, an annular groove which is cut off on the surface of the free blow tool which comes into contact with the packing and which is a tightening allowance within the elastic limit when the packing is fitted and tightened is provided. When the blow tool is applied and tightened with the screw ring, the packing interference presses the packing, but the thermal stress of the blow pipe is not applied to the packing more than the interference.
[0007]
【Example】
FIG. 1A is a cross-sectional view of a valve casing provided with a free-blowing tool according to an embodiment of the present invention, FIG. 1B is an enlarged cross-sectional view showing a state of part B of FIG. It is an expanded sectional view showing the state after packing conclusion of (B). 1A, 1B, and 1C, the same parts as those in FIG. 3 are denoted by the same reference numerals.
When the
At that time, as shown in FIG. 1 (B), an
FIG. 2 is a diagram showing the relationship between the deflection of the packing and the tightening force, and the hatched range indicates the elastic limit at which the deflection and the tightening force are proportional. If the packing is tightened beyond this elastic limit, the bending will not return to zero even if the tightening force is removed. However, in the present invention, since the packing is tightened within the oblique line, there is no possibility that the packing loses airtightness and causes a steam leak.
[0008]
【The invention's effect】
According to the present invention, the annular surface is formed on the surface of the free blow tool that comes into contact with the packing, and when the packing is fitted and tightened, an annular groove is provided which serves as an interference within the elastic limit. If it is tightened, the thermal stress of the blowpipe will not act on the packing beyond the tightness of the packing, and the steam will not leak during the free blow operation.
If only the permissible moment of the blow pipe is indicated, the free blow tool can be attached without expecting a load due to thermal stress on the packing, so that the blow pipe can be simplified.
[Brief description of the drawings]
1A is a cross-sectional view of a valve casing provided with a free blow tool according to an embodiment of the present invention, FIG. 1B is an enlarged cross-sectional view of a portion B of FIG. (C) is an enlarged sectional view showing the state after the packing is tightened in (B).
FIG. 2 is a diagram showing a relationship between a deflection of a packing and a tightening force.
FIG. 3 is a sectional view of a valve casing provided with a conventional free blow tool.
FIG. 4 is an enlarged sectional view of a portion IV in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10305695A JP3573226B2 (en) | 1995-04-04 | 1995-04-04 | Free blow tool for main steam piping |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10305695A JP3573226B2 (en) | 1995-04-04 | 1995-04-04 | Free blow tool for main steam piping |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08277702A JPH08277702A (en) | 1996-10-22 |
JP3573226B2 true JP3573226B2 (en) | 2004-10-06 |
Family
ID=14344024
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10305695A Expired - Lifetime JP3573226B2 (en) | 1995-04-04 | 1995-04-04 | Free blow tool for main steam piping |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3573226B2 (en) |
-
1995
- 1995-04-04 JP JP10305695A patent/JP3573226B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH08277702A (en) | 1996-10-22 |
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