JPS5843633B2 - Sealing device - Google Patents
Sealing deviceInfo
- Publication number
- JPS5843633B2 JPS5843633B2 JP54042727A JP4272779A JPS5843633B2 JP S5843633 B2 JPS5843633 B2 JP S5843633B2 JP 54042727 A JP54042727 A JP 54042727A JP 4272779 A JP4272779 A JP 4272779A JP S5843633 B2 JPS5843633 B2 JP S5843633B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- magnetic
- magnetic pole
- piece
- circumferential surface
- 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
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】
本発明は磁性流体を用いたシール装置に関し、更に、詳
しくは、シール部を非磁性材を用いた環状部材をもって
分割し、シール性の向上をはかるとともに、該環状部材
に対し、軸を支承・案内する機能をも併せて負担させる
ことにより構造を簡単化させたシール装置を提供するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device using a magnetic fluid, and more specifically, the present invention relates to a sealing device using a magnetic fluid, and more specifically, a sealing portion is divided by an annular member made of a non-magnetic material to improve sealing performance, and the annular member In contrast, the present invention provides a sealing device whose structure is simplified by also having the function of supporting and guiding the shaft.
従来から、磁石及び磁性流体を使用したシール装置が広
く知られている。Conventionally, sealing devices using magnets and magnetic fluids have been widely known.
この種のシール装置は第１図に例示する様に、回転、又
は往復運動をなす軸１を囲み、かつ軸１周面との間に空
間を保って磁石片２が配置され、磁石片２の軸方向両側
に、磁性材料を用いて環状に製せられた磁極片３が配置
され、磁極片３の内側は１個又は複数個の環状突起５を
形成する等により狭巾にされ、軸１との間に小隙間６を
保つ如くなされて、磁石片２により、環状突起５と軸１
との間に磁気回路を構成し、磁性流体７を小間隙６内に
保持し、磁場の強さに応じて発生する磁性流体内の圧力
により、磁極片３によって分割された空間Ａ、Ｂ、Ｃを
遮断させてシール機能を発揮させるものである。As illustrated in FIG. 1, this type of sealing device includes a magnet piece 2 that surrounds a shaft 1 that rotates or reciprocates, and is arranged with a space between the magnet piece 2 and the circumferential surface of the shaft 1. A magnetic pole piece 3 made of a magnetic material in an annular shape is arranged on both sides of the shaft in the axial direction, and the inside of the magnetic pole piece 3 is made narrow by forming one or more annular protrusions 5. 1, and the magnet piece 2 connects the annular protrusion 5 and the shaft 1.
A magnetic circuit is formed between the magnetic fluid 7 and the magnetic fluid 7 in the small gap 6, and the pressure within the magnetic fluid generated depending on the strength of the magnetic field causes the spaces A, B, and The sealing function is achieved by blocking C.
しかしながら、この種のシール装置は回転軸用のシール
手段としては有効であるが、軸方向に往復動をなす軸に
対しては、磁性流体が、自らが備える粘性のために軸の
往復動とともに軸方向に移動すること、及び磁石の作用
による空間磁場が軸の移動に伴なう磁性流体の運動によ
り乱されること等のためにシール性が低下させられ、実
用上においては解決すべき問題点を残していた。However, although this type of sealing device is effective as a sealing means for a rotating shaft, for a shaft that makes reciprocating motion in the axial direction, the magnetic fluid, due to its own viscosity, Due to the movement in the axial direction and the spatial magnetic field caused by the action of the magnet being disturbed by the movement of the magnetic fluid accompanying the movement of the shaft, the sealing performance is reduced, which is a problem that must be solved in practice. I left a mark.
本発明は前記した従来技術による磁性流体を用いたシー
ル装置における問題点に鑑み、磁極片を軸周面に対向す
る部分が狭い巾寸法を備える複数片となすとともに、互
いに隣接する磁極片の間に、内側に開口する環状の隙間
を設け、該隙間内に非磁性材料を用いて環状に製せられ
、軸周面との間に磁極片と軸周面との小隙間に比し、更
に小なる細隙を保つ摺動部片を挿入して、磁極片の内周
部と軸周面との間に介在する磁性流体の軸方向の移動を
抑止するとともに、摺動部片に対し、軸の往復動を案内
する軸受機能をも兼ねさせることにより、シール性能の
保持を図るとともに構造の単純化を期するものである。In view of the problems in the sealing devices using magnetic fluid according to the prior art described above, the present invention provides a plurality of magnetic pole pieces each having a narrow width in the portion facing the shaft circumferential surface, and a space between adjacent magnetic pole pieces. An annular gap opening inward is provided in the gap, and a non-magnetic material is used in the gap to form an annular shape, and the space between the magnetic pole piece and the shaft circumferential surface is smaller than the small gap between the pole piece and the shaft circumferential surface. A sliding piece that maintains a small gap is inserted to suppress the axial movement of the magnetic fluid interposed between the inner peripheral part of the magnetic pole piece and the shaft peripheral surface, and to By also serving as a bearing to guide the reciprocating motion of the shaft, it is possible to maintain sealing performance and simplify the structure.
摺動部片の材料としては合成樹脂材料、非鉄金属材料に
よる焼結合金等が使用される。As the material of the sliding part, a synthetic resin material, a sintered alloy made of a non-ferrous metal material, etc. are used.
以下、断面に基づいて本発明のシール装置の実施例につ
いて設問する。Below, questions will be asked regarding embodiments of the sealing device of the present invention based on cross sections.
第２図の実施例においては磁石片２の両側に位置する磁
極片３が３分割され、各磁極片３は内端部に環状突起５
を形成しており、互いに隣接する磁極片間の外方に磁性
材料による環状部片１１が挿入され、内方に非磁性材料
による環状の摺動部片１２が内挿され、分割された各磁
極片３は軸１周面との間に小間隙６を形成し、磁性流体
７が磁極片３と軸周面との小間隙６内に介在しており、
各摺動部片１２と軸１周面との間には磁極片３と軸周面
との小間隙６に比し、小さい細隙１３を形成している。In the embodiment shown in FIG. 2, the magnetic pole pieces 3 located on both sides of the magnet piece 2 are divided into three parts, and each magnetic pole piece 3 has an annular projection 5 at its inner end.
An annular piece 11 made of a magnetic material is inserted outwardly between adjacent magnetic pole pieces, and an annular sliding piece 12 made of a non-magnetic material is inserted inwardly between each of the divided magnetic pole pieces. A small gap 6 is formed between the magnetic pole piece 3 and the circumferential surface of the shaft 1, and a magnetic fluid 7 is interposed in the small gap 6 between the magnetic pole piece 3 and the circumferential surface of the shaft.
A narrow gap 13 is formed between each sliding piece 12 and the circumferential surface of the shaft 1, which is smaller than the small gap 6 between the magnetic pole piece 3 and the circumferential surface of the shaft.
第３図の実施例においては、第２図の実施例における環
状部片１１が磁極片３と一体をなして径方向内方に形成
した段部１５に摺動部片１２を収容する構造を有してお
り、第４図の実施例においては、第２図及び第３図の実
施例における摺動部片１２の外に、磁石片２と軸１周面
間の空間内に位置して軸１周面との間に、磁極片３と軸
１周面との小間隙６に比して小なる細隙１３を備える摺
動部材１７が収められている。In the embodiment shown in FIG. 3, the annular piece 11 in the embodiment shown in FIG. In the embodiment shown in FIG. 4, there is a space between the magnet piece 2 and the circumferential surface of the shaft 1, outside the sliding piece 12 in the embodiments shown in FIGS. 2 and 3. A sliding member 17 having a narrow gap 13 smaller than the small gap 6 between the magnetic pole piece 3 and the circumferential surface of the shaft 1 is housed between the magnetic pole piece 3 and the circumferential surface of the shaft 1.
本発明のシール装置が前記した構成要件を備えているこ
とにより下記する如き作用効果がもたらされる。Since the sealing device of the present invention has the above-described structural requirements, the following effects are brought about.
磁石片２の軸方向両側に設けられた磁極片３が複数個に
分割され、各磁極片３の中間に、非磁性材料を用いて製
せられ、磁極片３と軸１の周面との小間隙６に比し、小
なる細隙１３を備える摺動部片１２、又は摺動部材１７
が介在しているために、磁極片３と軸１周面間の小間隙
６内に介在して、磁極片３によって分割された空間Ａ。The magnetic pole piece 3 provided on both sides of the magnet piece 2 in the axial direction is divided into a plurality of pieces, and a non-magnetic material is used in the middle of each magnetic pole piece 3 to connect the magnetic pole piece 3 and the circumferential surface of the shaft 1. Sliding piece 12 or sliding member 17 having a narrow gap 13 smaller than the small gap 6
is present in the small gap 6 between the magnetic pole piece 3 and the circumferential surface of the shaft 1, and the space A is divided by the magnetic pole piece 3.
Ｂ、Ｃを相互に遮断する磁性流体７が軸１の往復動に伴
なって軸方向に移動しようとするのを制止されるので、
磁石片２の磁場の強さに基づく磁性流体７内の圧力によ
るシール機能が正常に保持され、又、摺動部片１２、及
び摺動部材１７が、軸１周面との間に細隙１３を備えて
軸１を支承する構造になっているので、別に軸受手段を
設けることを必要とせず、構造が全体的に単純化される
。Since the magnetic fluid 7 that blocks B and C from each other is prevented from moving in the axial direction as the shaft 1 reciprocates,
The sealing function due to the pressure in the magnetic fluid 7 based on the strength of the magnetic field of the magnet piece 2 is maintained normally, and the sliding piece 12 and the sliding member 17 are arranged so that there is no gap between them and the circumferential surface of the shaft 1. 13 to support the shaft 1, there is no need to provide a separate bearing means, and the overall structure is simplified.
尚、第２図乃至第４図の実施例においては各磁極片３の
一方の側面を截頭円錐面となして環状突起５を形成する
如く示しているが、磁極片３を薄肉の板状にするとか、
両側面を截頭円錐面にする等により、磁極片３の軸１周
面に対向する部分の巾寸法を狭くなしたものであれば同
様の効果がもたらされる。In the embodiment shown in FIGS. 2 to 4, one side surface of each magnetic pole piece 3 is shown as having a truncated conical surface to form an annular protrusion 5, but the magnetic pole piece 3 is shown as having a thin plate shape. or
A similar effect can be obtained if the width of the portion of the pole piece 3 facing the circumferential surface of the shaft 3 is made narrower, for example by forming both side surfaces into truncated conical surfaces.
第１図は磁性流体を用いたシール装置の原理を示す断面
図、第２図、第３図、及び第４図はそれぞれ本発明の実
施例を示す断面図である。
１・・・・・・軸、２・・・・・・磁石片、３・・・・
・・磁極片、５・・・・・・環状突起、６・・・・・・
小間隙、７・・・・・・磁性流体、１１・・・・・・環
状部片、１２・・・・・・摺動部片、１３・・・・・・
細隙、１５・・・・・・段部、１７・・・・・・摺動部
材、Ａ、Ｂ、Ｃ・・・・・・分割された空間。FIG. 1 is a sectional view showing the principle of a sealing device using magnetic fluid, and FIGS. 2, 3, and 4 are sectional views showing embodiments of the present invention. 1... shaft, 2... magnet piece, 3...
...Magnetic pole piece, 5...Annular protrusion, 6...
Small gap, 7... Magnetic fluid, 11... Annular piece, 12... Sliding piece, 13...
Slit, 15... Step portion, 17... Sliding member, A, B, C... Divided space.
Claims (1)
如くに配置された磁石片２、磁性材料を用いて製せられ
、前記磁石片２の軸方向両側に位置し、径方向内方端部
が狭い巾寸法を示し、罰記軸１の周面との間に小間隙６
を保っている複数個の磁極片３、非磁性材料を用いて製
せられ、前記磁極片３の径方向内方部分に挾まれ、前記
軸１周面との間に、前記磁極片３と前記軸１周面の小間
隙６に比して小なる細隙１３を形成する複数個の摺動部
片１２、及び前記磁極片３と前記軸１周面との間に介在
する磁性流体１７を有するシール装置。1 A shaft 1 made of a magnetic material, a magnet piece 2 arranged so as to maintain a space with respect to the shaft 1, a magnet piece 2 made of a magnetic material, located on both sides of the magnet piece 2 in the axial direction, and radially inward. The end shows a narrow width dimension, and there is a small gap 6 between it and the circumferential surface of the penetrating shaft 1.
A plurality of magnetic pole pieces 3 are made of a non-magnetic material, and are sandwiched between the radially inner portion of the magnetic pole piece 3 and the peripheral surface of the shaft 1. a plurality of sliding pieces 12 forming a narrow gap 13 smaller than the small gap 6 on the circumferential surface of the shaft 1; and a magnetic fluid 17 interposed between the magnetic pole piece 3 and the circumferential surface of the shaft 1. A sealing device with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54042727A JPS5843633B2 (en) | 1979-04-09 | 1979-04-09 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54042727A JPS5843633B2 (en) | 1979-04-09 | 1979-04-09 | Sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55135269A JPS55135269A (en) | 1980-10-21 |
| JPS5843633B2 true JPS5843633B2 (en) | 1983-09-28 |
Family
ID=12644084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54042727A Expired JPS5843633B2 (en) | 1979-04-09 | 1979-04-09 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5843633B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62158257U (en) * | 1986-03-28 | 1987-10-07 | ||
| NL8801925A (en) * | 1988-08-02 | 1990-03-01 | Skf Ind Trading & Dev | SEALING ASSEMBLY WITH A MAGNETIC LIQUID. |
| US4995622A (en) * | 1989-02-07 | 1991-02-26 | Nippon Pillar Packing Co., Ltd. | Magnetic fluid seal device |
| US5018751A (en) * | 1989-06-28 | 1991-05-28 | Ferrofluidics Corporation | Stacked pole-piece ferrofluid seal apparatus |
| US5267737A (en) * | 1992-01-16 | 1993-12-07 | International Business Machines, Corp. | Magnetic fluid seal containment shield |
| CN101776151B (en) * | 2010-03-08 | 2011-08-03 | 北京交通大学 | Reciprocating shaft magnetic liquid sealing structure |
| CN108061156B (en) * | 2017-11-07 | 2019-09-17 | 北京理工大学 | A kind of speed changer magnetorheological gearshift and application method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS519853A (en) * | 1974-07-03 | 1976-01-26 | Suwa Seikosha Kk | EKISHOHAIKOYOSUMAKUNIOKERU BUNSHIHOKONO KET SUTEIHOHO |
-
1979
- 1979-04-09 JP JP54042727A patent/JPS5843633B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS519853A (en) * | 1974-07-03 | 1976-01-26 | Suwa Seikosha Kk | EKISHOHAIKOYOSUMAKUNIOKERU BUNSHIHOKONO KET SUTEIHOHO |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55135269A (en) | 1980-10-21 |
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