JPH04125388A - Flexible conduit - Google Patents
Flexible conduitInfo
- Publication number
- JPH04125388A JPH04125388A JP2242538A JP24253890A JPH04125388A JP H04125388 A JPH04125388 A JP H04125388A JP 2242538 A JP2242538 A JP 2242538A JP 24253890 A JP24253890 A JP 24253890A JP H04125388 A JPH04125388 A JP H04125388A
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- flexible conduit
- outside
- vibration damping
- envelope
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000013016 damping Methods 0.000 claims abstract description 14
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 4
- 239000013013 elastic material Substances 0.000 claims description 6
- 239000012858 resilient material Substances 0.000 abstract 2
- 230000008602 contraction Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、内外圧力差が大きな場合に、安全に使用でき
る可撓性導管に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flexible conduit that can be safely used when the pressure difference between the inside and outside is large.
［従来の技術〕
真空を利用する装置と真空ポンプとの間を接続するには
、通常ベローズと称する可撓性導管を用いている。上記
ベローズは、一般に断面形状が７字状に形成された金属
板からなる多数の円環を重ね合わせて、外周縁をそれぞ
れ接合し、多くのひだをちょうちん状に形成した導管で
あって、上記導管の内部または外部に圧力を加えると、
外周部のひだが弾性変形して軸方向に伸縮し、上記圧力
を吸収する（機械工学便覧、Ｃ４−５０、日本機械学会
発行（１９８９年））。また上記ベローズは、その内部
に振動吸収材よりなる吸収柱体を設けて、振動発生側と
防振を必要とする物体間に介在させ、振動吸収をするよ
うにした例が知られている（特開昭６２−２６１７２８
号）。上記振動吸収材としては、ゲル状物質１例えばシ
リコーン樹脂にマイクロスフェア等の微小中空球体を混
合したものが適しているといわれているが、上記シリコ
ーンゲル材については特願昭６０−２９７５７７号に記
載されている。[Prior Art] Flexible conduits called bellows are commonly used to connect devices that utilize vacuum to vacuum pumps. The above-mentioned bellows is a conduit made by stacking a large number of circular rings made of metal plates each having a figure-7 cross-sectional shape and joining the outer peripheral edges of the rings, forming many folds in the shape of a lantern. Applying pressure inside or outside the conduit
The folds on the outer periphery are elastically deformed to expand and contract in the axial direction and absorb the above pressure (Mechanical Engineering Handbook, C4-50, published by the Japan Society of Mechanical Engineers (1989)). Furthermore, there is a known example of the bellows in which an absorption column made of a vibration absorbing material is provided inside the bellows and is interposed between the vibration generation side and an object requiring vibration isolation to absorb vibration ( Japanese Patent Publication No. 62-261728
issue). It is said that a gel material 1, for example a mixture of silicone resin and microscopic hollow spheres such as microspheres, is suitable as the vibration absorbing material. Are listed.
上記従来技術では、ベローズの外周部を形成するひだが
弾性変形して軸方向に伸縮するが、この伸縮には限度が
あり、大気中にさらされた上記ベローズの内側の圧力が
真空状態になると、上記べローズの内外圧力差が通常の
伸縮による吸収をこえる状態になり、上記ベローズを利
用した可撓性導管の末端における微細な調整が困難にな
り、真空利用装置の接続部に不具合を生じていた。In the above conventional technology, the folds forming the outer circumference of the bellows are elastically deformed and expand and contract in the axial direction, but there is a limit to this expansion and contraction, and when the pressure inside the bellows exposed to the atmosphere becomes a vacuum state, , the difference in pressure between the inside and outside of the bellows exceeds that which can be absorbed by normal expansion and contraction, making it difficult to make fine adjustments at the end of the flexible conduit using the bellows, and causing problems in the connections of vacuum equipment. was.
本発明は、内外の圧力差が大きな状態でも、安全に使用
できる可撓性導管を得ることを目的とする。An object of the present invention is to obtain a flexible conduit that can be used safely even under conditions where there is a large pressure difference between the inside and outside.
上記目的は、ベローズからなる可撓性導管の外側を、弾
性材料よりなる外被で包み、上記外被とベローズとの間
に振動緩衝材を充填することにより達成される。The above object is achieved by wrapping the outside of a flexible conduit made of bellows with a jacket made of an elastic material, and filling a space between the jacket and the bellows with a vibration damping material.
本発明による可撓性導管は、該導管を構成するベローズ
の外側を、覆い包む弾性材料よりなる外被を設け、上記
外被とベローズとの間の空間に振動緩衝材を充填したも
のである。上記可撓性導管の内外に圧力差を生じた場合
には、可撓性導管を構成するベローズの外周部のひだが
弾性変形し、上記ベローズを軸方向に伸縮させるように
変形するが、上記可撓性導管を用いて大気圧中で真空雰
囲気を作り出すなど、可撓性導管の内外に大きな圧力差
を生じる場合には、上記ベローズを伸縮変形させる力が
大きく、上記ベローズの接続端における自由度がなく、
微細な調整が困難になり不具合を生じていた。本発明の
可撓性導管では、上記伸縮変形する力が外被とベローズ
との間に充填された振動緩衝材に吸収されるため、実際
にベローズが伸縮される程度は抑制されることになり、
したがって、上記のような可撓性導管の内外における圧
力差が大きいために生じる、ベローズ端部の不具合を防
止することができる。上記振動ａ？＃材は、例えばウレ
タン樹脂のゲル状低弾性物質であって、上記材料は厚み
３■における衝撃吸収率が９０％以上に達する（商品名
ニゲルナック（日本オートメーション社製））ものなど
が適している。The flexible conduit according to the present invention is provided with an outer sheath made of an elastic material that covers the outside of the bellows constituting the conduit, and the space between the outer sheath and the bellows is filled with a vibration damping material. . When a pressure difference occurs between the inside and outside of the flexible conduit, the folds on the outer circumference of the bellows constituting the flexible conduit are elastically deformed, causing the bellows to expand and contract in the axial direction. When a large pressure difference is created between the inside and outside of a flexible conduit, such as when a flexible conduit is used to create a vacuum atmosphere at atmospheric pressure, the force that causes the bellows to expand and contract is large, resulting in a loss of freedom at the connecting end of the bellows. There is no degree,
This made fine adjustments difficult and caused problems. In the flexible conduit of the present invention, the force of expansion and contraction described above is absorbed by the vibration damping material filled between the jacket and the bellows, so the extent to which the bellows actually expands and contracts is suppressed. ,
Therefore, it is possible to prevent problems at the bellows end caused by the large pressure difference between the inside and outside of the flexible conduit as described above. Above vibration a? The # material is, for example, a gel-like low-elastic substance such as urethane resin, and the above-mentioned material has a shock absorption rate of 90% or more at a thickness of 3 cm (trade name Nigelnac (manufactured by Nippon Automation Co., Ltd.)), etc. .
つぎに本発明の実施例を図面とともに説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明による可撓性導管の一実施例を示す断面
図である。第１図において、本発明の可撓性導管は、ベ
ローズ１の外側に弾性材料よりなる外被２を設け、上記
外被２とベローズ１との間の空間に振動緩衝材３を充填
している。上記可撓性導管の一端を真空装置に接続し、
他端１ｍ設けたフランジ４を真空ポンプに連結するとと
もに、上記真空装置内を真空状態に保持するために真空
ポンプを稼動すると、上記ベローズ１の内側および外側
に圧力の差を生じ、この圧力差が上記ベローズ１を形成
するそれぞれのひだを弾性変形させ、そのため、上記ベ
ローズ１は軸方向しこ伸縮するような力を生しることに
なる。しかしながら、本発明による上記実施例の可撓性
導管では、上記ベローズ１と、上記ベローズ１の外側に
設けた弾性材料からなる外被２との間に、振動緩衝材３
を充填しているため、上記充填材のゲル状低弾性ウレタ
ン樹脂である振動緩衝材３に、上記ベローズ１が軸方向
に伸縮しようとする力は吸収されて弱められることにな
る。FIG. 1 is a cross-sectional view of one embodiment of a flexible conduit according to the present invention. In FIG. 1, the flexible conduit of the present invention is provided with a jacket 2 made of an elastic material on the outside of a bellows 1, and a vibration damping material 3 is filled in the space between the jacket 2 and the bellows 1. There is. Connecting one end of the flexible conduit to a vacuum device,
When the flange 4, which is 1 m long on the other end, is connected to a vacuum pump and the vacuum pump is operated to maintain the vacuum inside the vacuum device, a pressure difference is created between the inside and outside of the bellows 1. causes the respective pleats forming the bellows 1 to elastically deform, thereby generating a force that causes the bellows 1 to expand and contract in the axial direction. However, in the flexible conduit of the above embodiment according to the present invention, a vibration damping material 3 is provided between the bellows 1 and an outer sheath 2 made of an elastic material provided on the outside of the bellows 1.
As a result, the force of the bellows 1 to expand and contract in the axial direction is absorbed and weakened by the vibration damping material 3, which is a gel-like low-elasticity urethane resin filler.
したがって、真空で稼動させる上記真空装置を真空状態
に到達させるにつれて、上記ベローズ１の内と外とにお
ける圧力差は大きくなり、それしこっれてベローズｌの
伸縮力も大きくなる傾向にあるが、上記振動緩衝材３の
吸収によって上記軸方向の伸縮力は抑制され、ベローズ
端部の自由度が保持されて微細な調整が可能になる。Therefore, as the vacuum device operated in a vacuum reaches a vacuum state, the pressure difference between the inside and outside of the bellows 1 increases, and as a result, the expansion and contraction force of the bellows 1 also tends to increase. The absorption of the vibration damping material 3 suppresses the expansion/contraction force in the axial direction, and the degree of freedom of the bellows end is maintained, allowing fine adjustment.
なお、上記実施例では、ベローズ１の内側の圧力が外側
に対して小さい場合について記したが、ベローズ１の内
側の圧力が外側の圧力より大きくて内外圧力差を生しる
場合にも、上記振動緩衝材によって、ベローズ１の軸方
向に作用する力を抑制して同様な効果を得ることができ
る。In the above embodiment, the case is described in which the pressure inside the bellows 1 is smaller than the pressure outside, but the above-mentioned case can also be applied when the pressure inside the bellows 1 is greater than the pressure outside, causing a pressure difference between the inside and outside. A similar effect can be obtained by suppressing the force acting in the axial direction of the bellows 1 by using the vibration damping material.
上記のように本発明による可撓性導管は、ベローズから
なる可撓性導管の外側を、弾性材料よりなる外被で包み
、上記外被とベローズとの間に振動緩衝材を充填したこ
とにより、可撓性導管の内外の圧力差が大きな状態であ
っても、容易、かつ安全に使用できる可撓性導管を得る
ことができる。As described above, the flexible conduit according to the present invention is produced by wrapping the outside of the flexible conduit made of bellows with a jacket made of an elastic material, and filling a space between the jacket and the bellows with a vibration damping material. Therefore, it is possible to obtain a flexible conduit that can be used easily and safely even when there is a large pressure difference between the inside and outside of the flexible conduit.
第１図は本発明による可撓性導管の一実施例を示す断面
図である。
１・・・ベローズ
外被
・・振動緩衝材FIG. 1 is a cross-sectional view of one embodiment of a flexible conduit according to the present invention. 1...Bellows outer cover...Vibration cushioning material
Claims (1)
りなる外被で包み、上記外被とベローズとの間に振動緩
衝材を充填した可撓性導管。 ２、上記振動緩衝材は、ゲル状低弾性ウレタン樹脂であ
ることを特徴とする特許請求の範囲第１項に記載した可
撓性導管。[Scope of Claims] 1. A flexible conduit consisting of a bellows, the outside of which is wrapped with a jacket made of an elastic material, and a vibration damping material is filled between the jacket and the bellows. 2. The flexible conduit as set forth in claim 1, wherein the vibration damping material is a gel-like low-elasticity urethane resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2242538A JPH04125388A (en) | 1990-09-14 | 1990-09-14 | Flexible conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2242538A JPH04125388A (en) | 1990-09-14 | 1990-09-14 | Flexible conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04125388A true JPH04125388A (en) | 1992-04-24 |
Family
ID=17090603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2242538A Pending JPH04125388A (en) | 1990-09-14 | 1990-09-14 | Flexible conduit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04125388A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07159002A (en) * | 1993-11-30 | 1995-06-20 | Pacific Ind Co Ltd | Vibration-absorbing tube |
| FR2867823A1 (en) * | 2004-03-22 | 2005-09-23 | Cit Alcatel | SHOCK ABSORBER CONNECTION FOR VACUUM PUMP |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536669A (en) * | 1978-09-06 | 1980-03-14 | Toofure Kk | Expansion pipe joint for silencing pipings |
| JPS564804U (en) * | 1979-06-25 | 1981-01-17 |
-
1990
- 1990-09-14 JP JP2242538A patent/JPH04125388A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536669A (en) * | 1978-09-06 | 1980-03-14 | Toofure Kk | Expansion pipe joint for silencing pipings |
| JPS564804U (en) * | 1979-06-25 | 1981-01-17 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07159002A (en) * | 1993-11-30 | 1995-06-20 | Pacific Ind Co Ltd | Vibration-absorbing tube |
| FR2867823A1 (en) * | 2004-03-22 | 2005-09-23 | Cit Alcatel | SHOCK ABSORBER CONNECTION FOR VACUUM PUMP |
| EP1580477A1 (en) * | 2004-03-22 | 2005-09-28 | Alcatel | Damping connection for vacuum pump |
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