JPS62228761A - Hermetically sealed device - Google Patents
Hermetically sealed deviceInfo
- Publication number
- JPS62228761A JPS62228761A JP61072009A JP7200986A JPS62228761A JP S62228761 A JPS62228761 A JP S62228761A JP 61072009 A JP61072009 A JP 61072009A JP 7200986 A JP7200986 A JP 7200986A JP S62228761 A JPS62228761 A JP S62228761A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic fluid
- metal wire
- confounding
- annular pole
- magnet
- 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.)
- Granted
Links
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010030 laminating Methods 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 238000009954 braiding Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は１機器のハウジング等を貫通する回転軸笠の貫
通部におけるシール構造を磁性流体により形成した密封
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing device in which a sealing structure in a penetrating portion of a rotary shaft penetrating a housing or the like of a piece of equipment is formed of a magnetic fluid.
磁性流体によるシール部を構成した装置は、一般に第４
図に示すように、密封装２２Ａとこの密封装置Ａの両端
に設けたベアリングＢ、ＣをシールハウジングＤに内蔵
してユニット化されており、前記シールハウジングＤを
真空機鼎等の機塁Ｅにボルト（図示せず）ｈｇにより固
定することによって使用されている。前記密封装２ｔＡ
は可動軸３１に外環される円筒状の永久磁石３２を設け
、この永久磁石３２の両側に強磁性体でなり且つ前記可
動軸３１の外径よりもわずかに大きな内径を持つ環状ポ
ールピース３３，３４を設け、この環状ポールピース３
３゜３４と前記可動軸３１間の微小間隔に磁性流体を充
填してシール部３５としこの間隔を密封している。とこ
ろが磁性流体は強磁性微粉末を安定に分散させた懸濁液
であるため、長期間にわたる使用のうちに磁性粉を分散
状態にしている活性剤を含む溶媒が徐々に蒸発したりあ
るいは飛散することにより密封性が劣化してくるという
問題がある。このため、磁性流体を密封装置の外部から
補給する方法が考えられるが、装置が極めて複雑になる
ため実用に適さなかった。そこで、近時、貫通孔を持つ
リング状部材に磁性流体を含浸させ、これを密封装置内
に内蔵したものが開発されている。Devices with magnetic fluid seals generally have a fourth
As shown in the figure, a sealing device 22A and bearings B and C provided at both ends of the sealing device A are built into a seal housing D to form a unit. It is used by fixing it with a bolt (not shown) hg. Said sealing 2tA
A cylindrical permanent magnet 32 is provided on the outer ring of the movable shaft 31, and an annular pole piece 33 made of ferromagnetic material and having an inner diameter slightly larger than the outer diameter of the movable shaft 31 is provided on both sides of the permanent magnet 32. , 34, and this annular pole piece 3
A minute gap between the 3° 34 and the movable shaft 31 is filled with magnetic fluid to form a seal portion 35 to seal this gap. However, since magnetic fluid is a suspension in which fine ferromagnetic powder is stably dispersed, during long-term use, the solvent containing the activator that disperses the magnetic powder gradually evaporates or scatters. This poses a problem in that the sealing performance deteriorates. For this reason, a method of replenishing the magnetic fluid from outside the sealing device has been considered, but the device would be extremely complicated and would not be suitable for practical use. Therefore, recently, a ring-shaped member having a through hole is impregnated with magnetic fluid, and a ring-shaped member that is housed in a sealing device has been developed.
しかしながら、上記のような貫通孔を有したリング状部
材は、エツチング加工や曲げ加工といった複雑な前加工
が必要となり、様々な寸法が要求される密封装置にとっ
て対応しにくいという問題がある。また、貫通孔を有し
たリング状部材に磁性流体を含浸した場合、リング状部
材の空隙率（貫通孔の大きさ等）をコントロールするの
が難しいため、磁性流体が、前記永久磁石、環状ポール
ピース、及び回転体で形成される磁気回路中に移動する
までに数分の時間を要し、密封性の劣化に十分に対応す
ることができないという問題もあった。However, a ring-shaped member having a through hole as described above requires complicated pre-processing such as etching and bending, which poses a problem that it is difficult to accommodate sealing devices that require various dimensions. Furthermore, when a ring-shaped member with a through hole is impregnated with magnetic fluid, it is difficult to control the porosity of the ring-shaped member (size of the through hole, etc.). It takes several minutes to move into the magnetic circuit formed by the piece and the rotating body, and there is also the problem that deterioration of sealing performance cannot be adequately addressed.
本発明は上記のような事情に鑑みなされたものであって
、磁性流体によるシール部分に、内部に保持した補給用
磁性流体を円滑に供給することのできる密封装置を提供
することを目的とし、可動軸の貫通部に略円筒状磁石を
設け、この磁石の両側に磁石の内径よりも小さく且つ可
動軸の外径よりもわずかに大きな内径を持つ強磁性体の
環状ポールピースを設け、この環状ポールピースと前記
可動軸の間に生じる微小な間隙を磁性流体でシールする
密封装置において、前記円筒状磁石と環状ポールピース
により形成される溝状空間部に、磁性流体を保持した金
ＦＡ線交硅を内蔵したことを特徴とする密封装置を要旨
としている。The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a sealing device that can smoothly supply a replenishing magnetic fluid held inside to a sealed portion using a magnetic fluid. A substantially cylindrical magnet is provided in the penetrating portion of the movable shaft, and a ferromagnetic annular pole piece having an inner diameter smaller than the inner diameter of the magnet and slightly larger than the outer diameter of the movable shaft is provided on both sides of the magnet. In a sealing device that seals a minute gap created between a pole piece and the movable shaft with a magnetic fluid, a gold FA wire cross that holds a magnetic fluid is placed in a groove-shaped space formed by the cylindrical magnet and the annular pole piece. The gist is a sealing device that is characterized by having a built-in silicone.
本発明による密封装置は、円筒状磁石と環状ポールピー
スで形成される溝状空間部に装着した金属線交絡形成体
に磁性流体を保持させたことにより、この金属線交絡形
成体から磁性流体によるシール部分に円滑に磁性流体が
補給され、これによって溶媒の蒸発等による密封性の劣
化を防止する。In the sealing device according to the present invention, the magnetic fluid is retained in the metal wire interlacing forming body attached to the groove-shaped space formed by the cylindrical magnet and the annular pole piece. The magnetic fluid is smoothly replenished into the sealed portion, thereby preventing deterioration of sealing performance due to solvent evaporation, etc.
以下、本発明を図示した実施例に基づいて説明する。 The present invention will be described below based on illustrated embodiments.
第１図は実施例による密封装置の断面図を示し、１は機
器（図示せず）を貫通する回転軸である。FIG. 1 shows a cross-sectional view of a sealing device according to an embodiment, and 1 is a rotating shaft passing through a device (not shown).
２はこの回転軸ｌの貫通部に設けられたほぼ円筒状の永
久磁石であって、この永久磁石２の両側には、その内径
が永久磁石２の内径より小さく且つ前記回転軸ｌの外径
よりもやや大きな、強磁性体でなる環状ポールピース３
，４が設けられている。Reference numeral 2 denotes a substantially cylindrical permanent magnet provided in a penetrating portion of the rotating shaft l, and on both sides of the permanent magnet 2, an inner diameter of which is smaller than the inner diameter of the permanent magnet 2 and an outer diameter of the rotating shaft l is provided. Annular pole piece 3 made of ferromagnetic material, slightly larger than
, 4 are provided.
前記永久磁石２及び環状ポールピース３．４によって形
成される溝状空間部５には磁性流体を保持する金属線交
絡形成体８が装着されている。この金属線交絡形成体６
は、第２図に示すように、線材６ａをループ状に編んで
環状とした素材ｅｂｔ−積層したのち金型形成すること
により形成されるもので、前記線材６ａの材質としては
、軟鋼や硬鋼あるいはステンレス鋼等の鉄鋼材料や、銅
、アルミニウムあるいはそれらの合金鋼を含めた非鉄材
料が使用される。第３図は金属線交絡形成体６の斜視図
であって、前記素材８ｂを積層したのち任意の寸法に形
成したものである。このようにすることによってかかる
金属線交絡形成体６は、任意の空隙率を与えられ、しか
も線材６ａの材質や熱処理条件を選択することにより、
桟々の弾性力を持つものが得られる。前述のようにこの
金属線交絡形成体８には磁性流体が充填されており、し
たがって前記回転軸１が貫通部に装着されることによっ
て、永久磁石２、環状ポールピース３、回転軸１．環状
ポールピース４の経路で形成される磁路に対応し、磁性
流体は環状ポールピース３，４と回転軸１の間に生じる
微小な間隙に引きつけられる。よって、この微小な間隙
に引きつけられた磁性流体によってシール部７が形成さ
れ、機器の内外は完全に密封されるのである。A metal wire interlacing forming body 8 that holds a magnetic fluid is attached to the groove-shaped space 5 formed by the permanent magnet 2 and the annular pole piece 3.4. This metal wire entangled body 6
As shown in Fig. 2, the wire rod 6a is formed by knitting the wire rod 6a into a ring shape, laminating the material ebt and then forming it into a mold.The wire rod 6a is made of soft steel or hard steel. Ferrous materials such as steel or stainless steel, and non-ferrous materials including copper, aluminum, or their alloys are used. FIG. 3 is a perspective view of the metal wire entangled body 6, which is formed into arbitrary dimensions after laminating the materials 8b. By doing this, the metal wire entangled body 6 can be given an arbitrary porosity, and by selecting the material of the wire rod 6a and the heat treatment conditions,
You can obtain something with the elasticity of the beams. As described above, the metal wire intertwined body 8 is filled with magnetic fluid, and when the rotary shaft 1 is attached to the through-hole, the permanent magnet 2, the annular pole piece 3, the rotary shaft 1. Corresponding to the magnetic path formed by the path of the annular pole piece 4, the magnetic fluid is attracted to the minute gap created between the annular pole pieces 3, 4 and the rotating shaft 1. Therefore, the seal portion 7 is formed by the magnetic fluid attracted to this minute gap, and the inside and outside of the device are completely sealed.
以上のように構成される密封装置によれば、金属線交絡
形成体８に保持された磁性流体が、シール部７の磁性流
体の劣化あるいは飛散に伴なって素早くこのシール部７
に移動し、シール？Ｂ７における密封を長時間にわたっ
て確実に維持する。According to the sealing device configured as described above, the magnetic fluid held in the metal wire entangled formation body 8 is quickly removed from the sealing portion 7 as the magnetic fluid in the sealing portion 7 deteriorates or scatters.
Move to and seal? To reliably maintain the seal in B7 for a long time.
尚、前述のように、金属線交絡形成体の材質は種々存在
するが、磁性を持つ鉄鋼材料であれば飛散したシール部
の磁性流体を回収する効果を得られるし、熱伝導率の高
い非鉄材料であれば磁性流体の発熱に対する冷却効果を
期待出来る等のそれぞれの利点があり、必要に応じて使
い分けることが可能である。また、この金属線交絡形成
体の成形方法は必ずしも一定の条件のもとになされるも
のではなく、前記したように第２図に示すような環状に
した素材６ｂを積層したのち金ｙ！ｆｉ成形してもよい
し、線材をループ状に編んでなる平板状体の素材を渦巻
き状にした後金型成形するようにしてもよく、要するに
金属線を絡ませてなる素材を定められた大きさのもとに
所定の空隙率を有するよう形成されたものであればよい
。As mentioned above, there are various materials for the intertwined metal wires, but magnetic steel can be used to collect the scattered magnetic fluid from the seal, while non-ferrous materials with high thermal conductivity can be used. Each material has its own advantages, such as a cooling effect against the heat generated by the magnetic fluid, and can be used depending on the need. Furthermore, the method for forming this metal wire entangled body is not necessarily carried out under certain conditions; as mentioned above, after laminating the ring-shaped materials 6b as shown in FIG. 2, gold y! Fi forming may be used, or the material of a flat plate made by knitting wire rods in a loop shape may be spirally formed and then molded. Any material may be used as long as it has a predetermined porosity at the bottom.
以上の説明から明らかなように、本発明による密１４装
置によれば、シール部を形成する磁性流体が劣化したり
飛散したりしても、金属線交絡形成体に保持されている
磁性流体が順次シール部に補給されるから、密封効果を
長時間にわたって維持することができる。しかも、この
金属線交絡形成体は、磁性流体を保持する空隙の大きさ
のコントロールが確実に出来るから、シール部から磁性
流体が飛散した場合にも補給速度を極めて迅速なものと
することができ、密封効果が一時的に低下してしまうこ
ともない、更に、前記磁性流体を保持する空間の大きさ
である空隙率のコントロールが。As is clear from the above description, according to the dense 14 device according to the present invention, even if the magnetic fluid forming the seal portion deteriorates or scatters, the magnetic fluid held in the intertwined metal wire structure remains intact. Since the sealing portion is sequentially replenished, the sealing effect can be maintained for a long time. Moreover, since this metal wire entangled formation body can reliably control the size of the gap that holds the magnetic fluid, it is possible to make the replenishment speed extremely quick even if the magnetic fluid is scattered from the seal part. , the sealing effect does not deteriorate temporarily, and the porosity, which is the size of the space that holds the magnetic fluid, can be controlled.
線材量と金属線交絡体の大きさを決定することにより極
めて容易になし得るものであるから、製造効率も良いと
いう効果も奏する。This can be done extremely easily by determining the amount of wire and the size of the intertwined metal wire body, so it also has the effect of good manufacturing efficiency.
第１図は本発明による密封装置の実施例を示す縦断面図
、第２図は金属線交絡体の素材を示す斜視図、ｆｊＳ３
図は金属線交絡体の斜視図、第４図は従来例の縦断面図
である。
２・・・永久磁石
３．４・・・環状ポールピース
８・・・金属線交絡形成体
７・・・シール部
特許出願人 日本ピラーエ業株式会社代 理 人
弁理士 鈴江 孝−第１図
第２図
第３図Fig. 1 is a longitudinal sectional view showing an embodiment of the sealing device according to the present invention, Fig. 2 is a perspective view showing the material of the intertwined metal wire body, fjS3
The figure is a perspective view of a metal wire entangled body, and FIG. 4 is a longitudinal cross-sectional view of a conventional example. 2... Permanent magnet 3.4... Annular pole piece 8... Metal wire entangled formation body 7... Seal portion Patent applicant: Agent of Nippon Pillae Gyo Co., Ltd.
Patent Attorney Takashi Suzue - Figure 1 Figure 2 Figure 3
Claims (1)
の両側に磁石の内径よりも小さく且つ可動軸の外径より
もわずかに大きな内径を持つ強磁性体の環状ポールピー
スを設け、この環状ポールピースと前記可動軸の間に生
じる微小な間隙を磁性流体でシールする密封装置におい
て、前記円筒状磁石と環状ポールピースにより形成され
る溝状空間部に、磁性流体を保持した金属線交絡形成体
を内蔵したことを特徴とする密封装置。(1) A substantially cylindrical magnet is provided in the penetrating part of the movable shaft, and annular pole pieces made of ferromagnetic material are provided on both sides of the magnet, each having an inner diameter smaller than the inner diameter of the magnet and slightly larger than the outer diameter of the movable shaft. In a sealing device that seals a minute gap created between the annular pole piece and the movable shaft with a magnetic fluid, a metal holding a magnetic fluid is placed in a groove-shaped space formed by the cylindrical magnet and the annular pole piece. A sealing device characterized by having a built-in wire entanglement forming body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61072009A JPH076580B2 (en) | 1986-03-28 | 1986-03-28 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61072009A JPH076580B2 (en) | 1986-03-28 | 1986-03-28 | Sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62228761A true JPS62228761A (en) | 1987-10-07 |
| JPH076580B2 JPH076580B2 (en) | 1995-01-30 |
Family
ID=13476984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61072009A Expired - Lifetime JPH076580B2 (en) | 1986-03-28 | 1986-03-28 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH076580B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828059A (en) * | 1981-08-08 | 1983-02-18 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic fluid seal |
| JPS5861366A (en) * | 1981-10-05 | 1983-04-12 | Nippon Telegr & Teleph Corp <Ntt> | Shaft seal device |
-
1986
- 1986-03-28 JP JP61072009A patent/JPH076580B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828059A (en) * | 1981-08-08 | 1983-02-18 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic fluid seal |
| JPS5861366A (en) * | 1981-10-05 | 1983-04-12 | Nippon Telegr & Teleph Corp <Ntt> | Shaft seal device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH076580B2 (en) | 1995-01-30 |
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