JPS6129431B2 - - Google Patents
Info
- Publication number
- JPS6129431B2 JPS6129431B2 JP54009234A JP923479A JPS6129431B2 JP S6129431 B2 JPS6129431 B2 JP S6129431B2 JP 54009234 A JP54009234 A JP 54009234A JP 923479 A JP923479 A JP 923479A JP S6129431 B2 JPS6129431 B2 JP S6129431B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- shaft
- shaft sealing
- sealing device
- rotating shaft
- 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 34
- 239000011553 magnetic fluid Substances 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 8
- 239000001307 helium Substances 0.000 description 6
- 229910052734 helium Inorganic materials 0.000 description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000717 retained effect Effects 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
【発明の詳細な説明】
本発明は回転軸の軸封装置、さらに詳しくはガ
スまたは真空を取扱う回転機械の軸封装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft sealing device for a rotating shaft, and more particularly to a shaft sealing device for a rotating machine that handles gas or vacuum.
ガスまたは真空を取扱う回転機械には、例えば
超電導発電機がある。この超電導発電機は、起動
時に発電機回転子の内部空間の大気を冷却用のヘ
リウムガスに置換する必要がある。この置換作業
に際しては、その作業時間を短縮するために、回
転子内部空間を前もつて真空引きし、その後にヘ
リウムガスを注入する方法が考えられている。こ
のため、回転子に通ずるヘリウムガス給排機部に
設けられる軸封装置は、大気圧を十分に密封でき
る能力を有していなければならない。 Examples of rotating machines that handle gas or vacuum include superconducting generators. When starting up this superconducting generator, it is necessary to replace the atmosphere in the internal space of the generator rotor with helium gas for cooling. In order to shorten the time required for this replacement operation, a method has been considered in which the internal space of the rotor is evacuated in advance and then helium gas is injected. For this reason, the shaft sealing device provided in the helium gas supply/exhaust unit that communicates with the rotor must have the ability to sufficiently seal against atmospheric pressure.
これに対し、超電導発電機の平常運転時におい
ては、前述した軸封装置にはほとんど圧力差が加
わらないので、軸封装置の必要密封能力は小さく
て良い。一方、超電導発電機のヘリウムガス給排
機部の軸封装置には、ヘリウムガスを汚染せずに
安全に密封できることが必要であるとの観点か
ら、例えば特開昭53−75404号公報に示されるよ
うな磁性流体を用いたものが使用されているが、
この軸封装置では前述した軸封条件の変化に対応
することができない欠点があつた。 On the other hand, during normal operation of the superconducting generator, almost no pressure difference is applied to the shaft sealing device, so the required sealing capacity of the shaft sealing device may be small. On the other hand, from the viewpoint that it is necessary for the shaft sealing device of the helium gas supply/discharge unit of a superconducting generator to be able to safely seal the helium gas without contaminating it, for example, Japanese Patent Laid-Open Publication No. 75404/1983 discloses There are some types of magnetic fluids that are used.
This shaft sealing device had the drawback of not being able to respond to the aforementioned changes in shaft sealing conditions.
本発明は上記の事柄にもとづいてなされたもの
で、軸封条件の変化に対応し得る磁性流体を用い
た軸封装置を提供することを目的とする。 The present invention has been made based on the above-mentioned problems, and an object of the present invention is to provide a shaft sealing device using a magnetic fluid that can respond to changes in shaft sealing conditions.
本発明は上記の目的を達成するために、ケーシ
ングと回転軸との間に磁性流体を封入して構成さ
れる軸封装置において、前記回転軸を取り囲むケ
ーシング側に、回転軸線と直角に２個の磁性環状
体を設けて凹状空間を形成し、この凹状空間内に
おける磁性環状体間に、環状空間を形成する非磁
性の筒状の隔壁を設け、この環状空間内に電磁石
を設け、前記隔壁によつて形成された凹状空間内
に隙間をもつて挿入される永久磁石体を回転軸に
取付け、前記隙間に磁気流体を注入したものであ
る。 In order to achieve the above object, the present invention provides a shaft sealing device configured by sealing a magnetic fluid between a casing and a rotating shaft. A magnetic annular body is provided to form a concave space, a non-magnetic cylindrical partition wall forming an annular space is provided between the magnetic annular bodies in the concave space, an electromagnet is provided in the annular space, and the partition wall A permanent magnet is inserted into a concave space with a gap formed by the rotary shaft, and a magnetic fluid is injected into the gap.
このように構成したことにより、高い軸封条件
が要求される場合には、電磁石を通電すれば、そ
の磁束と永久磁石による磁束とにより密封能力を
高めることができる。 With this configuration, when high shaft sealing conditions are required, by energizing the electromagnet, the sealing ability can be increased by the magnetic flux of the electromagnet and the magnetic flux of the permanent magnet.
以下、本発明の実施例を図面について説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
図面は本発明の軸封装置の一実施例を示すもの
で、図において１は回転軸、２は回転軸１を取り
囲むケーシング、３は回転軸１の軸方向に間隔を
置いてケーシング２の内壁２ａに固定された磁性
環状体、４は磁性環状体３間に設けられて環状空
間を形成する非磁性の筒状の隔壁、５は回転軸１
に非磁性体６を介して固定された環状の永久磁石
体で、この永久磁石体５は２個の磁性環状体３間
の凹状空間に挿入されて隙間７を形成している。
８は隙間７の頂部付近に封入された磁性流体、９
は隔壁４の外周面とケーシング２の内壁２ａとの
間に設けられた電磁石で、この電磁石９は高い軸
封条件が要求されるときに通電される。 The drawing shows an embodiment of the shaft sealing device of the present invention, and in the drawing, 1 is a rotating shaft, 2 is a casing surrounding the rotating shaft 1, and 3 is an inner wall of the casing 2 at intervals in the axial direction of the rotating shaft 1. 2a is a fixed magnetic annular body; 4 is a non-magnetic cylindrical partition provided between the magnetic annular bodies 3 to form an annular space; 5 is a rotating shaft 1;
This permanent magnet body 5 is inserted into a concave space between two magnetic annular bodies 3 to form a gap 7.
8 is a magnetic fluid sealed near the top of the gap 7; 9
is an electromagnet provided between the outer peripheral surface of the partition wall 4 and the inner wall 2a of the casing 2, and this electromagnet 9 is energized when high shaft sealing conditions are required.
次に上述した本発明の軸封装置の一実施例の動
作を説明する。 Next, the operation of one embodiment of the shaft sealing device of the present invention described above will be explained.
高い軸封条件が要求される場合、例えば超電導
発電機の回転子内部空間を真空引きするような場
合には、電磁石９に通電する。これにより電磁石
９には符号Ｍで示すように永久磁石体５とにより
反時計方向の磁界が作られるので、磁性流体８に
作用する磁力は永久磁石５のみの場合にくらべて
大きくなる。このため、永久磁石体５の周面に磁
性流体８を密集させることができ、この結果密封
能力を高めることができる。 When high shaft sealing conditions are required, for example when the internal space of the rotor of a superconducting generator is evacuated, the electromagnet 9 is energized. As a result, a counterclockwise magnetic field is created between the electromagnet 9 and the permanent magnet 5 as indicated by the symbol M, so that the magnetic force acting on the magnetic fluid 8 becomes larger than when only the permanent magnet 5 is used. Therefore, the magnetic fluid 8 can be densely packed around the circumferential surface of the permanent magnet body 5, and as a result, the sealing ability can be improved.
次に上述した高い軸封条件が要求されなくなつ
た場合には、電磁石９への通電を停止すれば、永
久磁石体５の磁力のみによつて永久磁石体５の外
周に磁性流体８を保留することができるので、こ
の磁性流体８によつて、例えば、ヘリウムガスな
どの流体の漏洩を防ぐことができる。 Next, when the above-mentioned high shaft sealing condition is no longer required, if the power supply to the electromagnet 9 is stopped, the magnetic fluid 8 is retained on the outer periphery of the permanent magnet body 5 only by the magnetic force of the permanent magnet body 5. Therefore, the magnetic fluid 8 can prevent leakage of fluid such as helium gas.
この実施例によれば、軸封条件に応じた密封能
力が得られるとともに、高い軸封条件が要求され
るときのみ、電磁石９に通電すれば良いので無駄
な電力使用を防止することができる。 According to this embodiment, a sealing ability corresponding to the shaft sealing conditions can be obtained, and since it is only necessary to energize the electromagnet 9 when high shaft sealing conditions are required, wasteful use of power can be prevented.
以上詳述したように、本発明の軸封装置は密封
部に注入される磁性流体による密封能力を軸封条
件に応じて変えることができるので、軸封条件が
変化する回転機械の軸封部に使用すれば有効であ
る。また本発明の軸封装置は特に回転軸が大径で
あつたり、高速回転する回転機械および回転軸が
水平方向に配置されている回転機械の軸封に対し
てその密封効果を発揮するなどの効果がある。 As described in detail above, the shaft sealing device of the present invention can change the sealing ability of the magnetic fluid injected into the sealing portion depending on the shaft sealing conditions. It is effective if used for. In addition, the shaft sealing device of the present invention exhibits a sealing effect particularly for shaft seals of rotating machines with large diameter rotating shafts, rotating machines that rotate at high speed, and rotating machines in which the rotating shaft is arranged in a horizontal direction. effective.
図面は本発明の軸封装置の一実施例を示す縦断
面図である。
１……回転軸、２……ケーシング、３……磁性
環状体、４……非磁性の筒状の隔壁、５……永久
磁石体、７……隙間、８……磁性流体、９……電
磁石、１０……補助永久磁石体。
The drawing is a longitudinal sectional view showing an embodiment of the shaft sealing device of the present invention. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Casing, 3... Magnetic annular body, 4... Non-magnetic cylindrical partition, 5... Permanent magnet, 7... Gap, 8... Magnetic fluid, 9... Electromagnet, 10...Auxiliary permanent magnet.
Claims (1)
して構成される軸封装置において、前記回転軸を
取り囲むサーシング側に、回転軸線と直角に２個
の磁性環状体を設けて凹状空間を形成し、この凹
状空間内における磁性環状体間に、環状空間を形
成する非磁性の筒状の隔壁を設け、この環状空間
内に電磁石を設け、前記隔壁によつて形成された
凹状空間内に隙間をもつて挿入される永久磁石体
を回転軸に取付け、前記隙間に磁性流体を注入し
たことを特徴とする軸封装置。1. In a shaft sealing device configured by sealing a magnetic fluid between a casing and a rotating shaft, two magnetic annular bodies are provided on the surcing side surrounding the rotating shaft at right angles to the rotating axis to form a concave space. A non-magnetic cylindrical partition wall forming an annular space is provided between the magnetic annular bodies in this concave space, an electromagnet is provided in this annular space, and a gap is formed in the concave space formed by the partition walls. 1. A shaft sealing device characterized in that a permanent magnet inserted into the rotating shaft is attached to a rotating shaft, and a magnetic fluid is injected into the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP923479A JPS55103161A (en) | 1979-01-31 | 1979-01-31 | Shaft seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP923479A JPS55103161A (en) | 1979-01-31 | 1979-01-31 | Shaft seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55103161A JPS55103161A (en) | 1980-08-07 |
| JPS6129431B2 true JPS6129431B2 (en) | 1986-07-07 |
Family
ID=11714706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP923479A Granted JPS55103161A (en) | 1979-01-31 | 1979-01-31 | Shaft seal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55103161A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008128401A (en) * | 2006-11-22 | 2008-06-05 | Fanuc Ltd | Water-proof and dust-proof structure |
-
1979
- 1979-01-31 JP JP923479A patent/JPS55103161A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55103161A (en) | 1980-08-07 |
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