JPS63259294A - Nozzle column resonance preventive device - Google Patents
Nozzle column resonance preventive deviceInfo
- Publication number
- JPS63259294A JPS63259294A JP62093246A JP9324687A JPS63259294A JP S63259294 A JPS63259294 A JP S63259294A JP 62093246 A JP62093246 A JP 62093246A JP 9324687 A JP9324687 A JP 9324687A JP S63259294 A JPS63259294 A JP S63259294A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- column resonance
- resonance
- air column
- resonance prevention
- 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.)
- Granted
Links
- 230000003449 preventive effect Effects 0.000 title 1
- 230000002265 prevention Effects 0.000 claims description 20
- 230000030279 gene silencing Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Pipe Accessories (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えば蒸気などの流体の発生装置、輸送配管
ならびにそれらの付属系統などに設置する管台に係り、
特にその管台で発生する気柱共鳴を防止する装置に関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe stand installed in, for example, a fluid generator such as steam, a transportation pipe, and an attached system thereof.
In particular, it relates to a device for preventing air column resonance occurring in the nozzle.
例えばボイラ装置の蒸気供給管などのように流体が高速
で流通する管部で流体の乱れを生じ、それによって管台
内で気柱共鳴が発生していた。第９図はこの状態を示す
図で、主蒸気管この側面に管台８を設けると、管台８の
付根部付近において剥離渦９が発生し、これが原因して
管台８内の流体に周期的な変動が生じる。図中のＡは蒸
気（高速流体）の流れ方向を示している。For example, fluid turbulence occurs in pipes where fluid flows at high speed, such as the steam supply pipes of boiler equipment, which causes air column resonance within the nozzle stand. FIG. 9 shows this state. When the nozzle 8 is installed on this side of the main steam pipe, a separation vortex 9 is generated near the base of the nozzle 8, which causes the fluid inside the nozzle 8 to Periodic fluctuations occur. A in the figure indicates the flow direction of steam (high-speed fluid).
そして前述の変動の周波数が、管台８の音響的な固有振
動数に近づ（と、管台８内において強い共鳴振動が生じ
る。この共鳴による自動振動は、騒廿問題ならびに管台
８の強度問題を引き起こすばかりでなく、管台８内に例
えばセンサなどの特別な機能を有する機器等が装備され
ている場合は、共鳴振動によりそれの正常な機能が阻害
されるなどの問題を有している。Then, the frequency of the above-mentioned fluctuation approaches the acoustic natural frequency of the nozzle head 8 (and a strong resonant vibration occurs within the nozzle head 8. Automatic vibration due to this resonance causes noise problems and the nozzle head 8 Not only does this cause strength problems, but if equipment with special functions such as sensors is installed in the nozzle 8, there may be problems such as resonance vibrations inhibiting the normal functioning of the equipment. ing.
本発明の目的は、前述したような従来技術の欠点を解消
し、気柱共鳴による撮動が有効に防止できる管台気柱共
鳴防止装置を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a nozzle air column resonance prevention device that eliminates the drawbacks of the prior art as described above and can effectively prevent imaging due to air column resonance.
前述の目的を達成するため、本発明は、管台内部に発生
する気柱共鳴とほぼ同じ共鳴周波数を有する共鳴防止用
枝管を当該管台の側部に連通ずるように接合したことを
特徴とするものである。In order to achieve the above-mentioned object, the present invention is characterized in that a resonance prevention branch pipe having approximately the same resonance frequency as the air column resonance occurring inside the nozzle is connected to the side of the nozzle so as to communicate with the nozzle. That is.
次に本発明の実施例について図面とともに説明する。第
１図は、実施例に係る管台気柱共鳴防止装置の適用例を
示す概略構成図である。図中の１は２次過熱器、２は主
蒸気管、３は圧力調整弁、４は安全弁、５は温度針座、
６は圧力針座、７は高圧タービン、８は管台、矢印Ａは
蒸気の流れ方向をそれぞれ示している。Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an application example of the nozzle column resonance prevention device according to the embodiment. In the figure, 1 is a secondary superheater, 2 is a main steam pipe, 3 is a pressure regulating valve, 4 is a safety valve, 5 is a temperature needle seat,
Reference numeral 6 indicates a pressure needle seat, 7 indicates a high-pressure turbine, 8 indicates a nozzle stand, and arrow A indicates the flow direction of steam.
前記主蒸気管２内には高温、高圧、高速の蒸気が流れて
おり、配管の配置上の折れ曲がりなどにより、流れの角
度９強さ、流速分布などは微妙に変化している。High-temperature, high-pressure, high-speed steam flows in the main steam pipe 2, and the strength of the flow angle 9, flow velocity distribution, etc. vary slightly due to bends in the arrangement of the pipes.
そして主蒸気管２に取付けられた管台８の内部は流体の
よどみとなっており、管台８の付根部（開口部）付近で
剥離渦が生じる。この剥離渦が管台８の内面に沿って移
動することにより、結果として気柱共鳴が生じる。The inside of the nozzle holder 8 attached to the main steam pipe 2 is a fluid stagnation, and a separation vortex is generated near the base (opening) of the nozzle holder 8. As this separated vortex moves along the inner surface of the nozzle 8, air column resonance occurs as a result.
そのため第２図に示すように、第１実施例では管台８の
側壁中間部でかつ流体の流れ方向後流側には、管台８の
内部に発生する気柱共鳴とほぼ同じ共鳴周波数を有する
共鳴防止用枝’１１０が、管台８と連通するように設け
られている。Therefore, as shown in FIG. 2, in the first embodiment, at the middle part of the side wall of the nozzle 8 and on the downstream side in the fluid flow direction, a resonance frequency that is approximately the same as the air column resonance occurring inside the nozzle 8 is generated. A resonance prevention branch '110 having a resonance prevention branch '110 is provided so as to communicate with the nozzle stand 8.
第３図は、気柱共鳴防止装置の第２実施例を示す図であ
る。この実施例で前記第１実施例と相違する点は、枝管
１０の反管台８側端部に絞り板１１が介されている点で
ある。FIG. 3 is a diagram showing a second embodiment of the air column resonance prevention device. This embodiment differs from the first embodiment in that a throttle plate 11 is interposed at the end of the branch pipe 10 on the side opposite to the nozzle 8.
第４図は、気柱共鳴防止装置の第３実施例を示す図であ
る。この実施例で前記第２実施例と相違する点は、絞り
板１１０代りにバルブ１２を用い、このバルブ１２の開
度調整により共鳴振動防止のための周波数特性の調整が
可能である。FIG. 4 is a diagram showing a third embodiment of the air column resonance prevention device. The difference between this embodiment and the second embodiment is that a valve 12 is used instead of the diaphragm plate 110, and by adjusting the opening degree of the valve 12, it is possible to adjust the frequency characteristics for preventing resonance vibration.
第５図は、気柱共鳴防止装置の第４実施例を示す図であ
る。この実施例で前記第２実施例と相違する点は、絞り
板１１の代りに例えば炭素繊維、金属繊維、金属発泡体
などからなる吸音材１３を設けた点である。FIG. 5 is a diagram showing a fourth embodiment of the air column resonance prevention device. This embodiment differs from the second embodiment in that a sound absorbing material 13 made of carbon fiber, metal fiber, metal foam, etc., for example, is provided in place of the diaphragm plate 11.
前記実施例ではボイラ装置の場合について説明したが、
本発明はこれに限定されるものではなく、他の流体装置
にも適用することができる。In the above embodiment, the case of a boiler device was explained, but
The present invention is not limited thereto, and can be applied to other fluid devices.
主蒸気管２に管台８を接続し、透引通風機で主蒸気管２
内を吸引１−た場合の管台８内の振動周波数特性を第６
図に示す。同図に示すように従来の管台８の場合、３７
５Ｈ２に共鳴ピークを有している。Connect the nozzle holder 8 to the main steam pipe 2, and use the see-through draft fan to
The vibration frequency characteristics inside the nozzle 8 when the inside is suctioned are shown in the sixth
As shown in the figure. As shown in the figure, in the case of the conventional nozzle 8, 37
It has a resonance peak at 5H2.
第７図は、前述の管台８に共鳴防止用枝管１０を接続し
た場合（第１実施例）の周波数特性を示す図である。こ
の図から明らかなようＫ、前述の共鳴ピーク（３７５Ｈ
２）が減衰し、共鳴振動がなくなっている。FIG. 7 is a diagram showing frequency characteristics when the resonance prevention branch pipe 10 is connected to the aforementioned nozzle stand 8 (first embodiment). As is clear from this figure, K, the aforementioned resonance peak (375H
2) is attenuated and the resonance vibration disappears.
第８図は、前述の枝管１０に透孔を有する絞り板１１を
途中に介在した場合（第２実施例）の周波数特性を示す
図で、第１実施例のものよりもさらに振動ピーク値が減
衰していることが分かる。FIG. 8 is a diagram showing the frequency characteristics when the aperture plate 11 having a through hole is interposed in the middle of the branch pipe 10 (second embodiment), and the vibration peak value is even higher than that of the first embodiment. It can be seen that the is attenuated.
なお、第３実施例ならびに第４実施例においても前記第
８図とほぼ同様の優れた周波数特性を有することが実験
で穆認されている。It has been experimentally confirmed that the third and fourth embodiments also have excellent frequency characteristics similar to those shown in FIG. 8.
本発明は前述のような構成になっており、管台に共鳴防
止用枝管を設けることにより、この枝管に管台内の気柱
共鳴撮動と逆位相の気柱共鳴振動が発生し、枝管の開口
部でこの２つの振動が相互に打ち消し合い、管台内の気
柱共鳴が抑制される。The present invention has the above-mentioned configuration, and by providing a resonance prevention branch pipe in the nozzle stand, air column resonance vibration that is opposite in phase to the air column resonance imaging inside the nozzle is generated in this branch pipe. These two vibrations cancel each other out at the opening of the branch pipe, suppressing air column resonance within the nozzle stand.
そのため撮動に起因する騒音や構造物に与える悪影響が
有効に防止できる。Therefore, noise caused by imaging and adverse effects on structures can be effectively prevented.
第１図は本発明の実施例に係る管台気柱共鳴防止装置の
適用例を示す概略構成図、第２図、第３図、第４図、第
５図は本発明の各実施例に係る管台気柱共鳴防止装置の
断面図、第６図、第７図。
第８図は各側の振動周波数特性図、第９図は従来の管台
付近の断面図である。
２・・・・・・主蒸気管、８・・・・・・管台、１０・
・・・・・枝管、１１・・・・・・絞り板、１２・・・
・・・バルブ、１３・・・・・・ｉｆ部材。
第１図
第２図
第３図
第４図
ｎ
第５図
−で−
第６図
第７図
第８図
思渡扱
第９図
一二一FIG. 1 is a schematic configuration diagram showing an application example of a nozzle air column resonance prevention device according to an embodiment of the present invention, and FIG. 2, FIG. 3, FIG. 4, and FIG. 6 and 7 are cross-sectional views of such a nozzle air column resonance prevention device. FIG. 8 is a vibration frequency characteristic diagram on each side, and FIG. 9 is a sectional view of the vicinity of a conventional nozzle stand. 2...Main steam pipe, 8...Nozzle stand, 10.
...Branch pipe, 11...Aperture plate, 12...
...Valve, 13...if member. Fig. 1 Fig. 2 Fig. 3 Fig. 4 n Fig. 5 - in - Fig. 6 Fig. 7 Fig. 8 Thought treatment Fig. 9 121
Claims (5)
数を有する共鳴防止用枝管を当該管台の側部に連通する
ように接合したことを特徴とする管台気柱共鳴防止装置
。(1) A nozzle column resonance prevention device characterized in that a resonance prevention branch pipe having approximately the same resonance frequency as the air column resonance occurring inside the nozzle tube is connected so as to communicate with the side of the nozzle tube. .
鳴防止用枝管の管内途中に絞り手段が設置されているこ
とを特徴とする管台気柱共鳴防止装置。(2) The air column resonance prevention device according to claim (1), characterized in that a throttle means is installed in the middle of the resonance prevention branch pipe.
り手段が絞り板であることを特徴とする管台気柱共鳴防
止装置。(3) The nozzle air column resonance prevention device according to claim (2), wherein the throttle means is a throttle plate.
り手段がバルブであることを特徴とする管台気柱共鳴防
止装置。(4) The nozzle column resonance prevention device according to claim (2), wherein the throttle means is a valve.
鳴防止用枝管内に消音部材が設置されていることを特徴
とする管台気柱共鳴防止装置。(5) The nozzle column resonance prevention device as set forth in claim (1), characterized in that a silencing member is installed within the resonance prevention branch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62093246A JP2713341B2 (en) | 1987-04-17 | 1987-04-17 | Boiler equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62093246A JP2713341B2 (en) | 1987-04-17 | 1987-04-17 | Boiler equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63259294A true JPS63259294A (en) | 1988-10-26 |
| JP2713341B2 JP2713341B2 (en) | 1998-02-16 |
Family
ID=14077150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62093246A Expired - Fee Related JP2713341B2 (en) | 1987-04-17 | 1987-04-17 | Boiler equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2713341B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8393437B2 (en) * | 2011-02-15 | 2013-03-12 | Westinghouse Electric Company Llc | Noise and vibration mitigation system for nuclear reactors employing an acoustic side branch resonator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5727359A (en) * | 1980-06-12 | 1982-02-13 | Beejingeru Geruharuto | Deposit and/or cash paying device |
| JPS57127990A (en) * | 1981-08-31 | 1982-08-09 | Nec Corp | Selection circuit for semiconductor memory |
| JPS6014400U (en) * | 1983-07-08 | 1985-01-31 | 株式会社日立製作所 | Vibration prevention device for piping and valves |
-
1987
- 1987-04-17 JP JP62093246A patent/JP2713341B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5727359A (en) * | 1980-06-12 | 1982-02-13 | Beejingeru Geruharuto | Deposit and/or cash paying device |
| JPS57127990A (en) * | 1981-08-31 | 1982-08-09 | Nec Corp | Selection circuit for semiconductor memory |
| JPS6014400U (en) * | 1983-07-08 | 1985-01-31 | 株式会社日立製作所 | Vibration prevention device for piping and valves |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2713341B2 (en) | 1998-02-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |