JPS6049169A - Sealing arrangement - Google Patents
Sealing arrangementInfo
- Publication number
- JPS6049169A JPS6049169A JP58148251A JP14825183A JPS6049169A JP S6049169 A JPS6049169 A JP S6049169A JP 58148251 A JP58148251 A JP 58148251A JP 14825183 A JP14825183 A JP 14825183A JP S6049169 A JPS6049169 A JP S6049169A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- magnetic fluid
- oil repellent
- magnetic
- soft magnetic
- 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
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)
Abstract
Description
【発明の詳細な説明】
本発明は、コンピュータ用磁気ディスクのダストシール
装置又は真望装ｄの回転軸シール装置に適用して好適な
磁性酸体を応用した密封装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device using a magnetic acid body suitable for application to a dust sealing device for a magnetic disk for a computer or a rotary shaft sealing device for Maboso d.
例えば、磁気ディスク装置においては、外部に設置ｍ
ｌ−たモータから延長形成した回転軸のＳＩｉ郡にディ
スク部を取り付けることがある。このディスク設置４．
両所と外部との間は、ディスク部への塵埃又は湿気、ま
たは軸受のグリースミストを妨ぐため空気流通を遮断す
る密封装置が設けられる必要がある。For example, in a magnetic disk device, an external
A disk portion may be attached to the SIi group of the rotating shaft formed as an extension from the rotary motor. This disk installation 4.
A sealing device must be provided between the two locations and the outside to prevent air flow from entering the disk portion or from dust or moisture or grease mist from the bearing.
第１図は一般的なこの棟密封裟ｉ４の一例？示す断面図
である。環状の永久磁石１０両側に、環状の軟磁性体２
ａ、２ｂが取り付られ、強磁性体より成る回転軸４が挿
入され、継鉄ｉａ、ｉｌ）と回転軸４との間に形成され
た環状空隙に磁性流体ｊａ、３ｂが磁気的に捕捉されＣ
いる〜この種の密封装置は磁性流体を使用しているので
、一般に磁性流体シール（以〜トＭＦＳと略す）と呼ば
れている。磁性流体は油や水の中に強磁性流体微粒子を
安定に分散させた流体である。該流体を使用したＭＦＳ
は磁気的Ｖこ該流体を保持固定しているか′、゛該流体
のＭｌ”Ｓの構成要素に対する表面張力や重力によって
、真空装置におい゛Ｃ稼動していると例えば第１図に示
す如く、磁性流木が２ケ所の部分に分離されている状態
から、第２図に示す如く、分離されずに連って一体にな
る場合が多々生ずる。この様な傾向は継鉄間の距離が小
さくなる程、即ち永久磁石が薄（なる程起きやすくなる
。Is Figure 1 an example of a typical sealed building i4? FIG. An annular soft magnetic body 2 on both sides of an annular permanent magnet 10
a, 2b are attached, a rotating shaft 4 made of ferromagnetic material is inserted, and the magnetic fluids ja, 3b are magnetically captured in the annular gap formed between the yokes ia, il) and the rotating shaft 4. C
Since this type of sealing device uses magnetic fluid, it is generally called a magnetic fluid seal (hereinafter abbreviated as MFS). A magnetic fluid is a fluid in which ferromagnetic fluid particles are stably dispersed in oil or water. MFS using this fluid
Is the magnetic V holding and fixing the fluid? If C is operated in a vacuum device by the surface tension and gravity of the fluid against the Ml'S component, for example, as shown in Figure 1, There are many cases where magnetic driftwood goes from being separated into two parts to becoming one piece instead of being separated, as shown in Figure 2.This tendency occurs as the distance between the yokes becomes smaller. The thinner the permanent magnet is, the more likely it is to occur.
この様になると、本来２つの磁性流体環のもっている差
耐圧が１つの磁性流体環外の差耐圧しか即し本来の差耐
圧の半分しか機能ｌ−なくなる。In this case, the differential withstand pressure that the two magnetic fluid rings originally have only corresponds to the differential withstand pressure outside one magnetic fluid ring, and only half of the original withstand voltage difference functions.
また第３図に示す如く、該流体のＭＦＳの構成９索に対
する表面う長刀や重力によつ゛Ｃ回転体４や継鉄７ａ、
２ｂの外側の表面な磁気的な力に抗１〜でぬれ１尺播Ｉ
−てイｊき、磁１生流体自体で密封すべき空間や装置を
汚染する場合が生ずる。殊に回転体４の運転を浮面（７
だ直後は該汚染の度合いが激【２くなる。In addition, as shown in FIG. 3, the surface of the MFS of the fluid relative to the 9 cables is affected by the long blade and gravity, and the rotating body 4 and the yoke 7a,
Wet the outer surface of 2b with a magnetic force of 1~1 and spread it for 1 inch.
However, there are cases where the magnetic fluid itself contaminates spaces and equipment that should be sealed. In particular, the operation of the rotating body 4 is controlled by the floating surface (7
Immediately after that, the degree of contamination becomes extremely [2].
本発明はかかる点に鑑み、磁性流体のＭＦＳの構成要素
に対する表面張力や重力によって起こされる。７ Ｍ＋
”’Ｓの差耐圧の低下の阻止及び汚染を阻止せしめるた
め、該密封装置の磁性流体を除いた］再成安素の表面の
一部もしくは全面に撥油剤を塗布することにより、高性
能の密封装置を提供することを主たる目的どする。In view of this point, the present invention is caused by the surface tension or gravity of the magnetic fluid against the components of the MFS. 7 M+
``In order to prevent a decrease in the differential pressure resistance of the S and to prevent contamination, high-performance sealing is achieved by applying an oil repellent to part or the entire surface of the regenerated anhydride (with the magnetic fluid removed from the sealing device). The main purpose is to provide equipment.
本発明９工１強磁性体よりなる回転体に磁性流体を介し
て配置４された永久磁石の両極に接して設置された軟磁
性継鉄とで構成された密封装置において、該磁性流体を
除く他の構成要素の表面の全面あるいは一部に撥油剤を
塗布することを特徴とする密封装置である。9 of the present invention 1 In a sealing device comprising a rotating body made of a ferromagnetic material and a soft magnetic yoke installed in contact with both poles of a permanent magnet arranged via a magnetic fluid, the magnetic fluid is removed. This is a sealing device characterized by applying an oil repellent to the entire surface or part of the surface of other components.
本発明で用いる撥油剤は、金属等で構成された軸あるい
は磁極あるいはハウジングの表面に一部あるいは全面に
塗布し、該金属での表面張力を小さくし、即ち当接する
磁性流体のぬｉｚ拡大を防止させるものである。The lube repellent used in the present invention is applied partially or completely to the surface of a shaft, magnetic pole, or housing made of metal, etc., to reduce the surface tension of the metal, that is, to reduce the iz expansion of the magnetic fluid that comes into contact with it. This is to prevent it.
ちなみに金属、ガラス等の表面・脹ノｊは１００〜５０
０ ｄｙｎｅ／ｃｍであるのに対し、フロン系（フルオ
ロカーボン）撥油剤はＩ Ｃ１−２５ｄｙｎｅ ７０ｍ
であり炭化水素系撥油剤では２０〜５０ｄｙｎｅ／Ｃｍ
であるから、その効果が得られることは明白である。By the way, the surface and bulge of metal, glass, etc. is 100 to 50.
0 dyne/cm, whereas fluorocarbon oil repellent is I C1-25dyne 70m
and 20 to 50 dyne/Cm for hydrocarbon oil repellents.
Therefore, it is clear that this effect can be obtained.
以下本発明の実施例について図面を参照しながら詳細に
説明する。Embodiments of the present invention will be described in detail below with reference to the drawings.
前述した様に第２図における磁性流体の第１図における
よう（（分離せずに一体化したことによる差耐圧減少を
阻止するため、第４図に示す如く、回転体４の永久磁石
１に対応する周面部へにフロン系の撥油剤が塗布される
。これ（でより差耐圧の減少をみることはな（なる。ま
た第４図に示す継ｄ２ａ、２ｂの内面ＥＦ、ＧＨ１永久
磁石１の内周面Ｆ Ｇ及び回転体４０周面部ＡＫ撥油剤
を塗布することにより、差耐圧の減少を阻止することが
できる。化１−１磁性流体自身のぬれによ、る汚染の発
生の虞れは残ることがある。As mentioned above, as shown in FIG. 1 of the magnetic fluid in FIG. 2, the permanent magnet 1 of the rotating body 4 is A fluorocarbon-based oil repellent is applied to the corresponding peripheral surface.With this, the differential pressure resistance will not decrease. By applying an oil repellent to the inner circumferential surface FG and the circumferential surface of the rotating body 40, a decrease in differential pressure resistance can be prevented. This may remain.
第３図に示す如き、磁性流体のぬれ伝播による磁性流体
による汚染を阻止するため、第４図に示す如く、回転体
４の継鉄１ａ、ｉｂの外側に対応する周面部Ｂ及び継鉄
２ａ、２ｂの外側表面のＣｉ）面１，１１面にフロン系
撥油剤を塗布することにより、磁性流体のぬれによる汚
染を消失し得る。As shown in FIG. 3, in order to prevent contamination by the magnetic fluid due to wetting propagation of the magnetic fluid, as shown in FIG. By applying a fluorocarbon-based oil repellent to the Ci) surfaces 1 and 11 of the outer surfaces of , 2b, contamination due to wetting of the magnetic fluid can be eliminated.
但し、差耐圧の減少の虞れが残ることがある。However, there may still be a risk that the differential withstand voltage will decrease.
そこで、第４図に示す川（、回転体４の永久磁Ｅｉ １
に対応する周面部Ａ＆び継鉄２ａ、２ｂの外側に対応す
る周面部Ｂ、継鉄ｌａ、２ｂの内面Ｆ Ｉ；、 ＧＨ，
ＣＩ）、Ｊ Ｉ及び永久磁石１の内周面Ｆ６に、フロン
撥油ｉｌｌ （例えば旭硝子（株）製造にがかるサーフ
１ノン（商標名）ＳＲ−１００）を塗布することにより
、差耐圧の減少及び磁性流体のぬれによる汚染の発生が
阻止される。Therefore, the river shown in FIG.
Peripheral surface part A corresponding to the outside of the yokes 2a and 2b, peripheral surface part B corresponding to the outside of the yokes la and 2b, inner surface FI of the yokes la and 2b;
CI), J I and the inner peripheral surface F6 of the permanent magnet 1 are coated with a fluorocarbon oil repellent (for example, Surf 1 Non (trade name) SR-100 manufactured by Asahi Glass Co., Ltd.) to reduce the differential pressure resistance. and the occurrence of contamination due to wetting of the magnetic fluid is prevented.
尚、図４に示す回転体・永久磁石・継鉄の全面にフロン
系撥油剤を塗布した密封ｍ １ＭにＪ６いても、差耐圧
の減少や磁性流体のぬれによる汚染の両方も発生しない
。Incidentally, even if the rotating body, permanent magnet, and yoke shown in FIG. 4 are sealed with a fluorocarbon oil repellent coated on the entire surface of the rotor, permanent magnet, and yoke are sealed, neither a decrease in differential pressure resistance nor contamination due to wetting of the magnetic fluid will occur.
第５図は多段のＭ Ｆ Ｓ装置の一例を示す断面図であ
るう本例は、環状永久磁石１＆び継鉄２が回転体４の軸
心方向に複数枚重ねられ、その外側及び内周面を一体に
包む非磁性ハウジング６で軸受部が構成される。回転体
４には各永久磁石１に対応する外周面を所定量の四部４
ａが設けられる。FIG. 5 is a sectional view showing an example of a multi-stage MFS device. A bearing portion is constituted by a non-magnetic housing 6 that integrally wraps the surface. The rotating body 4 has a predetermined amount of four parts 4 on the outer peripheral surface corresponding to each permanent magnet 1.
a is provided.
そして撥油剤５を永久磁石１つ内周面に対向するハウジ
ング面及びハウジングの外側面、並びに回転体４０四部
４ａの両側部・底部及び回転体４のハウジング６の外側
に位置する周面の全てに塗布している。Then, apply the oil repellent 5 to the housing surface facing the inner circumferential surface of one permanent magnet, the outer surface of the housing, both sides and bottom of the four parts 4a of the rotating body 40, and all the circumferential surfaces of the rotating body 4 located outside the housing 6. It is applied to.
第６図は本発明の他の例を示し、１個の永久磁石１の内
周面中央１ｃ及びこれに対応する回転体４の外周面４Ｃ
Ｋ撥油剤５を塗亜した例であり、その他の箇所は上述的
に示す塗布１所１（任意に確される。FIG. 6 shows another example of the present invention, in which the center 1c of the inner circumferential surface of one permanent magnet 1 and the outer circumferential surface 4C of the rotating body 4 corresponding thereto are
This is an example in which the K oil repellent 5 was applied, and the other parts are coated at one place 1 as described above (as determined arbitrarily).
第７図は単段ＭＦＳ装置の永久磁石１０両側面及び回転
体４の磁石１の外側に対応する周面に撥油剤５を塗布し
た例である。FIG. 7 shows an example in which the oil repellent 5 is applied to both side surfaces of the permanent magnet 10 of a single-stage MFS device and to the peripheral surface of the rotating body 4 corresponding to the outside of the magnet 1.
また第８図、第９図に示した如く撥油剤を塗布する部分
において様々なバタ・−ンに撥油剤を塗布することによ
って、その効果を更に上げられる。Furthermore, the effect can be further enhanced by applying the oil repellent to various patterns in the areas to which the oil repellent is applied, as shown in FIGS. 8 and 9.
以上の各実施例（、（おいても、磁性流体がそもそも潤
滑油等に強磁性微粒子を分赦せ［７めたものであるから
、撥油剤により第２図に示した様なｆ〜４ＦＳ内部での
磁性流体内部での連結が発生しないため及び撥油剤によ
り磁性流体がぬれて行くのを阻止する作用の結果、差耐
圧の減少阻止及び磁性流体のぬれによる汚染防止が図ら
れることになる。In each of the above examples (, (), since the magnetic fluid was created by absorbing ferromagnetic particles in the lubricating oil, etc., the inside of f~4FS as shown in Figure 2 was Since no coupling occurs within the magnetic fluid, and as a result of the lube repellent's action to prevent the magnetic fluid from getting wet, a reduction in differential pressure resistance and contamination due to wetting of the magnetic fluid can be prevented.
以−ヒ述べたタロ＜本発明によれば、強磁性体よりなる
回転体に磁性流体を介して配置された永久磁Ｇと該永久
磁石の両極に接して設置された軟磁性継鉄とで構成され
た密封装置跋にお〜・て、該磁性流体を除く他の耐酸要
素の表面の全面又は一部に撥油１１１ｊを塗布したので
、磁性流体を使った密封装置）ｄ Ｆ Ｓにおいて差耐
圧が安定し且つ磁性流体のぬれ等による汚染の少ない密
封装置の提供が可能となる。According to the present invention, a permanent magnet G disposed on a rotating body made of a ferromagnetic material via a magnetic fluid and a soft magnetic yoke disposed in contact with both poles of the permanent magnet. In addition to the constructed sealing device, oil repellent 111j was applied to the entire surface or part of the surface of other acid-resistant elements other than the magnetic fluid, so there was no difference in the sealing device using magnetic fluid. It is possible to provide a sealing device with stable pressure resistance and less contamination due to wetting of the magnetic fluid.
一１１図は一般的なこの種密封”Ｊｔの一例を示す断面
図、第２図及び第３図は従来例の説明に供する断面図、
第４図は本発明の一例を示す断面図、第５図、第６図、
第７１図、第８図及び第９図はイぐ発明の他の例を示す
図である。
１・・・永久磁石、２・・・継鉄、３・磁性流体、４・
回転体、５・・・撥油剤。
出願人代理人 弁理−１＝ 秋 山 １０゜第１１＜１
第３１に１
−Ｉ ｆ
第２図 第４図
手続補正書
特許庁長官 志賀 学 殿
持□′［庁審判長 殿
ｆ−？ ｊ’＋庁審査官 殿
１、 事件の表示
昭和５８年特 許 願第 １４８２５１ 号２、 発明
の名称 密封装置
３、補正をする者
事件との関係 出願人
（ＩＥ ｉ’＋？ 宮城県仙台市郡山六丁目７番１号氏
名・名称 東北金属工業株式会社
４、代理人
ｆ主 所 東京都千代田区神田錦町−丁目１３番地宝栄
錦町ビル６、補正により増ｈ１目−る発明の数
（１） 明細書第５頁４行「磁性流体自身」を１磁性流
体自体」と訂正する。
（２） 同第６頁１０行「外周面を１をＶ外周面に１と
訂正する。
（３）図面中第４図を別紙の通り訂正する。
以 」二Fig. 111 is a sectional view showing an example of a common type of sealing "Jt", Figs. 2 and 3 are sectional views illustrating conventional examples,
FIG. 4 is a sectional view showing an example of the present invention, FIGS. 5 and 6,
FIG. 71, FIG. 8, and FIG. 9 are diagrams showing other examples of the invention. 1. Permanent magnet, 2. Yoke, 3. Magnetic fluid, 4.
Rotating body, 5...oil repellent. Applicant's agent Patent attorney-1 = Akiyama 10゜No. 11<1
No. 31 1 -I f Figure 2 Figure 4 Procedural amendments Commissioner of the Patent Office Manabu Shiga Tonomochi □' [Chief Examiner of the Office Tonomochi f-? j'+ Office examiner 1, Indication of the case 1982 Patent Application No. 148251 2, Title of the invention Sealing device 3, Person making the amendment Relationship to the case Applicant (IE i'+? Sendai City, Miyagi Prefecture) 6-7-1 Koriyama Name: Tohoku Metal Industry Co., Ltd. 4, Agent f Owner: Hoei Nishikicho Building 6, 13-chome, Kanda Nishikicho, Chiyoda-ku, Tokyo Number of inventions (1) increased by amendment ``Magnetic fluid itself'' on page 5 of the specification, line 4, is corrected to ``magnetic fluid itself.'' (2) Page 6, line 10 of the specification, ``1 for the outer peripheral surface is corrected to 1 for the V outer peripheral surface.'' (3) Drawings Figure 4 is corrected as shown in the attached sheet.
Claims (1)
永久磁石と該永久磁石の両極に接して設置された軟磁性
継鉄とで構成された密封装置Ｃにおいて、該磁性流体を
除く他の構成要素の表面の全面又は一部に撥油剤を塗布
したことを特徴とする密封装置。A sealing device C consisting of a permanent magnet placed on a rotating body made of ferromagnetic material via a magnetic fluid, and a soft magnetic yoke installed in contact with both poles of the permanent magnet, except for the magnetic fluid. A sealing device characterized in that an oil repellent is applied to the entire surface or a part of the surface of the component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58148251A JPS6049169A (en) | 1983-08-13 | 1983-08-13 | Sealing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58148251A JPS6049169A (en) | 1983-08-13 | 1983-08-13 | Sealing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6049169A true JPS6049169A (en) | 1985-03-18 |
Family
ID=15448605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58148251A Pending JPS6049169A (en) | 1983-08-13 | 1983-08-13 | Sealing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6049169A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63123868U (en) * | 1987-02-04 | 1988-08-11 | ||
| US5271631A (en) * | 1989-05-31 | 1993-12-21 | Atsushi Yokouchi | Magnetic fluid seal apparatus |
| US5660397A (en) * | 1994-09-23 | 1997-08-26 | Holtkamp; William H. | Devices employing a liquid-free medium |
| WO2002095271A1 (en) * | 2001-05-22 | 2002-11-28 | Nok Corporation | Magnetic fluid seal device |
| CN104405886A (en) * | 2014-11-26 | 2015-03-11 | 北京交通大学 | Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment |
| CN112049937A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Double-coating magnetic liquid sealing device |
-
1983
- 1983-08-13 JP JP58148251A patent/JPS6049169A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63123868U (en) * | 1987-02-04 | 1988-08-11 | ||
| US5271631A (en) * | 1989-05-31 | 1993-12-21 | Atsushi Yokouchi | Magnetic fluid seal apparatus |
| US5660397A (en) * | 1994-09-23 | 1997-08-26 | Holtkamp; William H. | Devices employing a liquid-free medium |
| US5704613A (en) * | 1994-09-23 | 1998-01-06 | Holtkamp; William H. | Methods for sealing and unsealing using a magnetically permeable solid-based medium |
| WO2002095271A1 (en) * | 2001-05-22 | 2002-11-28 | Nok Corporation | Magnetic fluid seal device |
| US7100923B2 (en) | 2001-05-22 | 2006-09-05 | Nok Corporation | Magnetic fluid seal device |
| KR100866696B1 (en) * | 2001-05-22 | 2008-11-04 | 엔오케이 가부시키가이샤 | Magnetic fluid seal device |
| CN104405886A (en) * | 2014-11-26 | 2015-03-11 | 北京交通大学 | Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment |
| CN112049937A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Double-coating magnetic liquid sealing device |
| CN112049937B (en) * | 2020-09-08 | 2021-05-18 | 清华大学 | Double-coating magnetic liquid sealing device |
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