JPH03546B2 - - Google Patents
Info
- Publication number
- JPH03546B2 JPH03546B2 JP58099908A JP9990883A JPH03546B2 JP H03546 B2 JPH03546 B2 JP H03546B2 JP 58099908 A JP58099908 A JP 58099908A JP 9990883 A JP9990883 A JP 9990883A JP H03546 B2 JPH03546 B2 JP H03546B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- yoke
- magnetic
- magnetic fluid
- cylindrical portion
- 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 - Lifetime
Links
- 239000011553 magnetic fluid Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009751 slip forming Methods 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)
- Sealing Of Bearings (AREA)
Description
【発明の詳細な説明】
本発明は磁性流体を磁気的に捕捉してなる磁性
流体シール装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic fluid sealing device that magnetically traps magnetic fluid.
従来、磁性流体シール装置としては第１図に示
すような構成であつた。図において、１は磁性体
で構成されたシヤフト、２は環状の永久磁石、３
はシヤフト１と同心円に配設された環状の磁性ヨ
ークであり、シヤフト１とヨーク３との間に磁性
流体４を捕捉し、シール効果を得ている。 Conventionally, a magnetic fluid seal device has a configuration as shown in FIG. In the figure, 1 is a shaft made of magnetic material, 2 is an annular permanent magnet, and 3 is a shaft made of magnetic material.
is an annular magnetic yoke disposed concentrically with the shaft 1, and captures the magnetic fluid 4 between the shaft 1 and the yoke 3 to obtain a sealing effect.
そして、従来の装置では磁石２とヨーク３とは
エポキシ系（例えば商品名アライダイト）樹脂５
で互いに接着して組み立てて、ハウジング６に収
納していた。 In the conventional device, the magnet 2 and yoke 3 are made of epoxy resin (for example, trade name Araidite) 5.
They were assembled by gluing them together and housed in the housing 6.
ところで、この種の装置は運搬中あるいは動作
中に例えば−20℃〜＋80℃の温度変化に曝らされ
ることが多々ある。 Incidentally, this type of device is often exposed to temperature changes of, for example, -20° C. to +80° C. during transportation or operation.
この結果、温度変化により磁石２及びヨーク４
が膨脹・収縮するとともに、殊に接着に用いた樹
脂の膨脹・収縮が大きくヨーク４と磁石２との間
のリーク、あるいはハウジング６と磁石２あるい
はヨーク４との間のリークが発生し、ひいては磁
気的に捕捉しているヨーク４とシヤフト１との間
のシール効果が損われるという欠点がある。この
欠点は、ヨーク４あるいは磁石２の個数即ち磁性
シールの段数が多ければ更にリークが顕著であ
る。 As a result, the magnet 2 and the yoke 4 due to temperature changes.
expands and contracts, and especially the resin used for bonding expands and contracts to a large extent, causing leaks between the yoke 4 and the magnet 2, or between the housing 6 and the magnet 2 or the yoke 4. A disadvantage is that the sealing effect between the magnetically captured yoke 4 and the shaft 1 is impaired. This drawback becomes more pronounced when the number of yokes 4 or magnets 2, ie, the number of stages of magnetic seals, increases.
本発明はかかる点に鑑み、熱変化に影響されな
い、高性能で長寿命の磁性流体シール装置を提供
することを主たる目的とする。 In view of this point, the main object of the present invention is to provide a high-performance, long-life magnetic fluid sealing device that is not affected by thermal changes.
以下本発明の一実施例について図面を参照しな
がら詳細に説明する。 An embodiment of the present invention will be described in detail below with reference to the drawings.
第２図は本発明の一例を示す一部断面図であ
る。真空装置に接する側にフランジ１８ｂ、磁性
シヤフト１１とヨーク１３との間に筒状部１８ａ
を延長形成して、両者１８ａ，１８ｂを一体に組
立て、非磁性体で構成されたハウジング１８をシ
ヤフト１１にベアリング１７でもつて装着する。
筒状部１８ａとシヤフト１１との間には接触しな
い様に隙間ｇが形成されている。 FIG. 2 is a partially sectional view showing an example of the present invention. A flange 18b is provided on the side in contact with the vacuum device, and a cylindrical portion 18a is provided between the magnetic shaft 11 and the yoke 13.
The housing 18 made of a non-magnetic material is attached to the shaft 11 with a bearing 17.
A gap g is formed between the cylindrical portion 18a and the shaft 11 so that they do not come into contact with each other.
そして、筒状部１８ａの外側から磁石１２とヨ
ーク１３とでシヤフト１１まで磁力を及ぼさせ、
筒状部１８ａとシヤフト１１とで形成される隙間
ｇに磁性流体１４を挿入し捕捉することで、ヨー
ク１３に対応する位置に磁気的に捕捉され軸封作
用が得られることになる。従つて、第１図例に示
すような磁石２とヨーク３、あるいはハウジング
５と磁石２及びヨーク３とのリーク破れの虞れは
全くなくなり、温度変化にほとんど影響されない
長寿命のシール装置を得ることが可能となる。 Then, a magnetic force is applied from the outside of the cylindrical portion 18a to the shaft 11 by the magnet 12 and the yoke 13,
By inserting the magnetic fluid 14 into the gap g formed between the cylindrical portion 18a and the shaft 11 and capturing it, it is magnetically captured at a position corresponding to the yoke 13, and a shaft sealing effect is obtained. Therefore, there is no risk of leakage and breakage between the magnet 2 and the yoke 3, or the housing 5, the magnet 2, and the yoke 3 as shown in the example in FIG. 1, and a long-life sealing device that is almost unaffected by temperature changes is obtained. becomes possible.
第３図は、本発明の他の例を示す要部の断面図
である。本例においてヨーク２３に対応した位置
のハウジングの筒状部分２８ａの内周側に複数の
突起部２８ｃを連続形成したものである。その突
起２８ｃの部分とシヤフト３１との間には磁性流
体２４を捕捉させ、隣り合う磁性流体との間に磁
性流体の存在しない空間Ｓを形成したものであ
る。 FIG. 3 is a sectional view of essential parts showing another example of the present invention. In this example, a plurality of projections 28c are continuously formed on the inner peripheral side of the cylindrical portion 28a of the housing at a position corresponding to the yoke 23. The magnetic fluid 24 is trapped between the protrusion 28c and the shaft 31, and a space S where no magnetic fluid exists is formed between adjacent magnetic fluids.
第４図は、筒状部分３８の外周面と、ヨーク３
３の内周面とに同ピツチのネジ山３８ａ，３３ａ
を形成し、ねじ込みにしたものである。尚、第２
図と同趣旨の部分は同一符号を付して説明を略す
る。 FIG. 4 shows the outer peripheral surface of the cylindrical portion 38 and the yoke 3.
Threads 38a, 33a of the same pitch on the inner peripheral surface of 3
It is formed and screwed. Furthermore, the second
Parts having the same meaning as those in the figures are designated by the same reference numerals, and explanations thereof will be omitted.
以上述べた如く本発明によれば、軟磁性シヤフ
トと、少なくとも１個以上の環状永久磁石と、該
環状永久磁石の両側に接する環状ヨークと、該環
状ヨークとシヤフトとの間に配設される筒状部及
びフランジ部が設けられた非磁性ハウジングとで
構成され、上記筒状部とシヤフトとの間に磁性流
体を挿入捕捉したので、本装置の運転中等におい
て温度変化が生じた場合であつても磁性流体は常
に上記筒状部内に維持されているため、上記磁石
又はヨーク側にリークすることがなくなり、リー
クに起因して磁性流体の量の減少に伴う密封効果
の低減を生じない高性能・長寿命のシール装置を
提供することができる。 As described above, according to the present invention, a soft magnetic shaft, at least one annular permanent magnet, an annular yoke in contact with both sides of the annular permanent magnet, and a soft magnetic shaft disposed between the annular yoke and the shaft. It is composed of a cylindrical part and a non-magnetic housing provided with a flange part, and the magnetic fluid is inserted and captured between the cylindrical part and the shaft. However, since the magnetic fluid is always maintained within the cylindrical part, it will not leak to the magnet or yoke side, and the sealing effect will not be reduced due to a decrease in the amount of magnetic fluid due to leakage. It is possible to provide a sealing device with high performance and long life.
第１図は従来装置の断面図、第２図は本発明の
一例を示す断面図、第３図及び第４図は夫々本発
明の他の実施例を示す要部の断面図である。
１１……磁性シヤフト、１２……永久磁石、１
３……磁性ヨーク、１４……磁性流体、１８……
ハウジング、１８ａ……筒状部。
FIG. 1 is a sectional view of a conventional device, FIG. 2 is a sectional view showing an example of the present invention, and FIGS. 3 and 4 are sectional views of essential parts showing other embodiments of the present invention. 11...Magnetic shaft, 12...Permanent magnet, 1
3...Magnetic yoke, 14...Magnetic fluid, 18...
Housing, 18a...cylindrical part.
Claims (1)
状永久磁石と、該環状永久磁石の両側に接する環
状ヨークと、該環状ヨークとシヤフトとの間に配
設される筒状部及びフランジ部が設けられた非磁
性ハウジングとで構成され、上記筒状部とシヤフ
トとの間に磁性流体を挿入捕捉したことを特徴と
する磁性流体シール装置。 ２ 上記筒状部は上記環状ヨークに対応する位置
を突起状に形成した特許請求の範囲第１項記載の
磁性流体シール装置。[Scope of Claims] 1. A soft magnetic shaft, at least one annular permanent magnet, an annular yoke in contact with both sides of the annular permanent magnet, and a cylindrical portion disposed between the annular yoke and the shaft. and a non-magnetic housing provided with a flange portion, wherein a magnetic fluid is inserted and captured between the cylindrical portion and the shaft. 2. The magnetic fluid sealing device according to claim 1, wherein the cylindrical portion is formed into a protrusion at a position corresponding to the annular yoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58099908A JPS59226767A (en) | 1983-06-03 | 1983-06-03 | Magnetic fluid seal apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58099908A JPS59226767A (en) | 1983-06-03 | 1983-06-03 | Magnetic fluid seal apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59226767A JPS59226767A (en) | 1984-12-19 |
| JPH03546B2 true JPH03546B2 (en) | 1991-01-08 |
Family
ID=14259874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58099908A Granted JPS59226767A (en) | 1983-06-03 | 1983-06-03 | Magnetic fluid seal apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59226767A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115152B (en) * | 2013-01-30 | 2015-05-06 | 北京交通大学 | Magnetic fluid and maze alternated type combined sealing |
-
1983
- 1983-06-03 JP JP58099908A patent/JPS59226767A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59226767A (en) | 1984-12-19 |
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