JPS6091066A - Magnetic fluid seal mechanism - Google Patents
Magnetic fluid seal mechanismInfo
- Publication number
- JPS6091066A JPS6091066A JP58200160A JP20016083A JPS6091066A JP S6091066 A JPS6091066 A JP S6091066A JP 58200160 A JP58200160 A JP 58200160A JP 20016083 A JP20016083 A JP 20016083A JP S6091066 A JPS6091066 A JP S6091066A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- magnetic
- magnetic fluid
- gap
- proof
- 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
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 38
- 239000000428 dust Substances 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims description 7
- 230000005484 gravity Effects 0.000 abstract description 10
- 239000006185 dispersion Substances 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000843 powder 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
- 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、ポールピースの回転体との対向部に面取りを
処し、ポールピースと回転体との間の空隙に発生する磁
化に磁場勾配をつけたことを特徴とする磁性流体シール
機構に関する。[Detailed Description of the Invention] The present invention is characterized in that the portion of the pole piece facing the rotating body is chamfered, and a magnetic field gradient is applied to the magnetization generated in the gap between the pole piece and the rotating body. The present invention relates to a magnetic fluid seal mechanism.
従来の磁性流体シール機構を第１図に示す。第１図に於
て、２枚のリング状の軟磁性板であるポールピース１１
−（α）及び１１−（，６）（ただし便宜上１１−（α
〕を防塵空間に近い方とし上ポールピースと称し、１ｌ
−（Ａ）を下ポールピースと称するンで肉厚方向に着磁
されたリング状のマグネット１２を挾持し、軟磁性材料
で作られる回転体１３と空隙をもって配設されており、
この空隙に磁性流体１４を注入し、図中の矢印で示され
るような磁場によって磁性流体が保持されており、回転
体に対してので示される部分の空間と■で示される空間
とを磁性流体によりシールしており、仮に■の空間を防
塵空間とすると、塵埃を多く含む■の空間から塵埃が（
ｂの空間に混入するのを防止している。ところが、第１
図の如き磁性流体シール機構では、磁性流体の非磁性物
質に対する比重差選別の原理（参考文献；工業材料、第
３０巻、第７号）により、非磁性の塵埃は一度磁性流体
内にとりこまれても、比重の小さいものほど磁化の小さ
い部分すなわち磁性流体の表面に移動し易くなり、特に
第１因のように微小な非磁性の塵埃１５が、図のような
磁性流体表面に移動してきた場合、回転体の遠心力によ
って微小な非磁性の塵埃１５は防塵空間のへ飛散してし
まう恐れがあり、比重の比較的小さい軸受のグリスの飛
散粉やアルミニウムの如く比較的比重の小さい非磁性の
軽金属の飛散粉による塵埃が、磁性流体シールを通過し
て防塵空間に混入してしまい磁性流体シールの防塵シー
ルとしての信頼性を著しく低下させてしまう。さらに、
磁場が小さい部分を防塵空間側に持つために磁性流体自
体が遠心力によって飛散する恐れさえある。A conventional magnetic fluid seal mechanism is shown in FIG. In Fig. 1, the pole piece 11 is two ring-shaped soft magnetic plates.
-(α) and 11-(,6) (for convenience, 11-(α
] is the one closest to the dust-proof space, which is called the upper pole piece, and is 1l.
- (A) is called a lower pole piece, which holds a ring-shaped magnet 12 magnetized in the thickness direction, and is arranged with a gap between it and a rotating body 13 made of a soft magnetic material;
A magnetic fluid 14 is injected into this gap, and the magnetic fluid is held by a magnetic field as shown by the arrow in the figure. If the space in ■ is made into a dust-proof space, dust will come from the space in ■ which contains a lot of dust (
This prevents it from entering the space b. However, the first
In the magnetic fluid sealing mechanism as shown in the figure, non-magnetic dust is once trapped in the magnetic fluid based on the principle of selective gravity difference between magnetic fluid and non-magnetic materials (Reference: Industrial Materials, Vol. 30, No. 7). However, the smaller the specific gravity, the easier it is to move to the less magnetized part, that is, the surface of the magnetic fluid, and especially the first cause, minute non-magnetic dust 15, has moved to the surface of the magnetic fluid as shown in the figure. In this case, there is a risk that minute non-magnetic dust 15 may be scattered into the dust-proof space due to the centrifugal force of the rotating body. Dust caused by scattered light metal powder passes through the magnetic fluid seal and enters the dust-proof space, significantly reducing the reliability of the magnetic fluid seal as a dust-proof seal. moreover,
Since the part with a small magnetic field is located in the dust-proof space, there is even a risk that the magnetic fluid itself may be scattered due to centrifugal force.
本発明はかかる従来技術の問題点を解決せしめるもので
、その目的は、比重の小さい非磁性の塵埃のシールの向
上、さらには磁性流体の飛散の防止にある。The present invention is intended to solve the problems of the prior art, and its purpose is to improve sealing of non-magnetic dust with low specific gravity and to prevent scattering of magnetic fluid.
以下実施例に基づいて本発明の詳細な説明する第２図は
一本発明の一実施例の磁性流体シール機構を示すもので
、第２図に於て塵埃空間■と防塵空間■との防塵シール
が目的である。第２図に於て、鉄等の軟磁性の材料で構
成される上ポールピース２１−（α）及び下ポールピー
ス２ｌ−（ｂ）の２枚のリング状の板によってマグネッ
ト２２が挟持固定されていて、軟磁性の回転体２３との
間の空隙に磁性流体２４が注入され、図中の矢印で示さ
れるような磁場によって空隙に保持されている。上ポー
ルピース及び下ポールピースは磁性流体を保持する空隙
に磁場勾配を与えるために、ポールピースの空隙側の内
周に於て防塵空間側に近づくに従って磁場が強くなるよ
うに、面取り（テーパ面ンを設けである。ただし少なく
とも防塵空間側のポールピースに而取りしてあれば良い
。また、第３図の如く防塵空間側の空隙を一部で小さく
するように、ポールピース３１の内周空隙面の一部に面
取りしたものも適用可能である。The present invention will be explained in detail below based on an embodiment. Fig. 2 shows a magnetic fluid sealing mechanism according to an embodiment of the present invention. The purpose is the sticker. In FIG. 2, a magnet 22 is clamped and fixed between two ring-shaped plates, an upper pole piece 21-(α) and a lower pole piece 2l-(b), which are made of soft magnetic material such as iron. A magnetic fluid 24 is injected into the gap between the soft magnetic rotating body 23 and held in the gap by a magnetic field as shown by the arrow in the figure. In order to apply a magnetic field gradient to the air gap that holds the magnetic fluid, the upper and lower pole pieces have a chamfer (tapered surface) on the inner periphery of the air gap side of the pole piece so that the magnetic field becomes stronger as it approaches the dust-proof space. However, it is sufficient if it is provided at least on the pole piece on the dust-proof space side.In addition, as shown in Fig. 3, the inner circumference of the pole piece 31 should be It is also applicable that a part of the gap surface is chamfered.
上述した実施例に於て、磁性流体を保持する空隙に磁場
勾配を与えることによって、磁性流体中に混入した塵埃
は、比重の大きい塵埃はど磁場の大きい方（空隙長の短
い防塵空間側）へ移動し、比重の小さい塵埃はど磁場の
小さい方（望隙長の長い塵埃空間側）へ移動する。回転
体で発生する塵埃は、概して軸受のグリスの飛散による
塵埃や摺動部の摩耗により発生する塵埃が多く、その中
でも磁性の金踊粉のような塵埃は磁性流体中に混入して
もマグネットにより吸引されているため磁性流体から飛
散していかないので、非磁性の塵埃について考えると、
軸受のグリスの飛散による塵埃やアルミニウムのような
軽金属の塵埃のような比較的比重の小さい塵埃は、磁場
の小さい塵埃空間側に移動し防塵空間への非磁性の塵埃
の混入を防止することが可能である。また、磁性流体を
保持する空隙は防塵空間側の方が小さく、高い磁場が得
られるので少ない磁性流体を大きリカで保持しているこ
とになり、（磁性流体の遠心力による防塵空間側への飛
散を最小限に押さえることができる。In the above-described embodiment, by applying a magnetic field gradient to the air gap holding the magnetic fluid, the dust mixed into the magnetic fluid is directed to the side where the magnetic field is larger (the side of the dust-proof space where the air gap length is short) and the dust with a large specific gravity is removed. The dust with low specific gravity moves to the side where the magnetic field is smaller (the side of the dust space where the gap length is longer). Most of the dust generated on rotating bodies is caused by scattering grease from bearings or by abrasion of sliding parts. Among these, dust such as magnetic gold powder does not attract magnets even if mixed into the magnetic fluid. When considering non-magnetic dust, it does not fly away from the magnetic fluid because it is attracted by the magnetic fluid.
Dust with relatively low specific gravity, such as dust from flying grease on bearings or dust from light metals such as aluminum, moves to the dust space where the magnetic field is small, preventing non-magnetic dust from entering the dust-proof space. It is possible. In addition, the air gap that holds the magnetic fluid is smaller on the dust-proof space side, and a higher magnetic field can be obtained, so a small amount of magnetic fluid is held with a large amount of force (because of the centrifugal force of the magnetic fluid, the air gap is smaller in the dust-proof space side). Splashing can be kept to a minimum.
本発明によれは、ポールピース内周の簡単な面取りによ
り、非磁性で比重の小さい塵埃に対する防塵性が向上し
、磁性流体の防塵空間側への飛散を防止することができ
る。本発明は、一般に回転体の防塵シールに応用可能で
あり、特に、非磁性で比重の小さい塵埃に対する防塵シ
ールに効果的であり、ハードディスクの回転軸の防塵シ
ールのような非磁性で比重の小さい塵埃を多く含む塵埃
空間から回転体の防塵シールを行う場合は特に効果的で
ある。According to the present invention, by simply chamfering the inner periphery of the pole piece, the dustproof property against non-magnetic and low specific gravity dust can be improved, and it is possible to prevent the magnetic fluid from scattering toward the dust-proof space side. INDUSTRIAL APPLICABILITY The present invention is generally applicable to dust-proof seals for rotating bodies, and is particularly effective as a dust-proof seal against non-magnetic and low-specific gravity dust, and can be applied to dust-proof seals for non-magnetic and low-specific gravity dust, such as dust-proof seals for the rotating shaft of hard disks. This is particularly effective when sealing a rotating body against dust from a dusty space containing a large amount of dust.
第１図は従来の磁性流体シール機構の断面概観図。
第２図は本発明の磁性流体シール機構の一実施例の断面
概観図であり、２１−（α）は上ボールヒ゛−ス、２ｌ
−（ｂンは下ボールヒ゛−ス、２２はマグネット、２３
は回転体、２４は磁性流体、但し、回転体に対しての側
を防塵漿聞、■側を塵埃空間、である。
＊Ｘ３図は本発明の他の実施例の？妊性流体シール機構
のポールピースの断面概読図であり、３１はポールピー
スである。
以 上
出願人 株式会社諏訪精工舎
代理人 弁理士 最上 務
第１図
第２図
第３図FIG. 1 is a cross-sectional schematic diagram of a conventional magnetic fluid seal mechanism. FIG. 2 is a cross-sectional schematic view of one embodiment of the magnetic fluid sealing mechanism of the present invention, where 21-(α) is the upper ball base, 2l
-(b is the lower ball base, 22 is the magnet, 23
24 is a rotating body, and 24 is a magnetic fluid. However, the side facing the rotating body is a dustproof chamber, and the side 2 is a dust space. *Is diagram X3 of another embodiment of the present invention? It is a cross-sectional schematic view of the pole piece of the fertility fluid sealing mechanism, and 31 is the pole piece. Applicant Suwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami Figure 1 Figure 2 Figure 3
Claims (1)
ピースによって挾持されるマグネット。 回転部に配設される軟磁性の回転体、で磁気回路を構成
し、該２枚のポールピースと該回転体との空隙に磁性流
体を注入し、回転体の防塵シールを行う磁性流体シール
機構に於いて、該複数のポールピースのうち少なくとも
防塵空間に近い方の１個について磁性流体を注入する空
隙部である該回転体との対向部に而取りを処しであるこ
とを特徴とする磁性流体シール機４＋１；０[Claims] A plurality of ring-shaped soft magnetic pole pieces, and a magnet held by the plurality of pole pieces. A magnetic fluid seal that configures a magnetic circuit with a soft magnetic rotating body disposed in a rotating part, injects magnetic fluid into the gap between the two pole pieces and the rotating body, and seals the rotating body against dust. The mechanism is characterized in that at least one of the plurality of pole pieces closer to the dust-proof space is provided with a hole in the part facing the rotating body, which is the gap part into which the magnetic fluid is injected. Magnetic fluid sealing machine 4+1;0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58200160A JPS6091066A (en) | 1983-10-26 | 1983-10-26 | Magnetic fluid seal mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58200160A JPS6091066A (en) | 1983-10-26 | 1983-10-26 | Magnetic fluid seal mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6091066A true JPS6091066A (en) | 1985-05-22 |
Family
ID=16419781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58200160A Pending JPS6091066A (en) | 1983-10-26 | 1983-10-26 | Magnetic fluid seal mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6091066A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4927164A (en) * | 1988-08-08 | 1990-05-22 | Ferrofluidics Corporation | Ferrofluid seal with epoxy pole pieces |
| US5009436A (en) * | 1988-07-11 | 1991-04-23 | Nippon Densan Corporation | Magnetic fluid seal assembly |
| JPH0391577U (en) * | 1989-12-28 | 1991-09-18 | ||
| US5238254A (en) * | 1987-07-17 | 1993-08-24 | Koyo Seiko Co., Ltd. | Ferrofluid seal apparatus |
-
1983
- 1983-10-26 JP JP58200160A patent/JPS6091066A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5238254A (en) * | 1987-07-17 | 1993-08-24 | Koyo Seiko Co., Ltd. | Ferrofluid seal apparatus |
| US5009436A (en) * | 1988-07-11 | 1991-04-23 | Nippon Densan Corporation | Magnetic fluid seal assembly |
| US4927164A (en) * | 1988-08-08 | 1990-05-22 | Ferrofluidics Corporation | Ferrofluid seal with epoxy pole pieces |
| JPH0391577U (en) * | 1989-12-28 | 1991-09-18 |
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