JPH0640377Y2 - Magnetic fluid sealing device - Google Patents
Magnetic fluid sealing deviceInfo
- Publication number
- JPH0640377Y2 JPH0640377Y2 JP3555189U JP3555189U JPH0640377Y2 JP H0640377 Y2 JPH0640377 Y2 JP H0640377Y2 JP 3555189 U JP3555189 U JP 3555189U JP 3555189 U JP3555189 U JP 3555189U JP H0640377 Y2 JPH0640377 Y2 JP H0640377Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- pieces
- magnetic fluid
- sealing device
- magnetic pole
- 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
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） この考案に係る磁性流体シール装置は、各種真空機器の
回転軸貫通部の気密を保持する場合等に利用する事が出
来る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The magnetic fluid sealing device according to the present invention can be used to maintain airtightness of the rotary shaft penetrating portion of various vacuum devices.
（従来の技術） 実験器具、測定器具等、各種真空機器に於いて、内部が
真空となったケーシング内に存在する物体を、外部に設
けたモータにより回転駆動する場合がある。(Prior Art) In various vacuum devices such as experimental instruments and measuring instruments, an object existing in a casing having a vacuum inside may be rotationally driven by a motor provided outside.
この様な場合、モータにより駆動される回転軸を、ケー
シングの壁面を気密に貫通させる必要がある。In such a case, the rotary shaft driven by the motor needs to penetrate the wall surface of the casing in an airtight manner.
この為従来から、シリコンオイル等の液体中に磁性粉末
を分散させて成る磁性流体を、永久磁石の磁力によっ
て、回転軸の外周面とケーシングの内周面との間に存在
する円筒状の空間の一部に保持し、この磁性流体によ
り、回転軸の回転を許容しつつ、この回転軸が貫通した
部分の気密保持を図る事が行なわれていた。For this reason, conventionally, a magnetic fluid formed by dispersing magnetic powder in a liquid such as silicone oil is generated by a magnetic force of a permanent magnet into a cylindrical space existing between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the casing. It has been performed that the magnetic fluid is allowed to rotate, and the magnetic fluid is allowed to rotate, while maintaining airtightness of the portion penetrated by the rotary shaft.
ところで、この様な磁性流体シール装置を使用して、真
空機器の様なシール装置両側の圧力差が大きい部分の気
密保持を図る場合、磁性流体を多団に亙って保持する必
要があるが、この様な場合に、単に通常の磁性流体シー
ル装置を直列に設けただけでは、磁性流体シール装置の
軸方向に亙る寸法が長くなり、装置の小型化を図り難く
なる為、好ましくない。By the way, in the case where such a magnetic fluid seal device is used to maintain the airtightness of a portion having a large pressure difference between the both sides of the seal device such as a vacuum device, it is necessary to hold the magnetic fluid in many groups. In such a case, simply providing the normal magnetic fluid sealing device in series increases the dimension in the axial direction of the magnetic fluid sealing device, which makes it difficult to downsize the device, which is not preferable.
この為従来から、例えば米国特許明細書第4605233号明
細書に記載されている様に、１個の磁極片により磁性流
体を、２段に亙って保持する構造が考えられている。For this reason, conventionally, as described in, for example, U.S. Pat. No. 4,605,233, a structure in which a magnetic fluid is held in two stages by one magnetic pole piece has been considered.
第４図は、この様な従来の磁性流体シール装置を示して
いるが、先ずこの様な従来の磁性流体シール装置に就い
て説明する。FIG. 4 shows such a conventional magnetic fluid sealing device. First, such a conventional magnetic fluid sealing device will be described.
第４図に於いて１は、磁性流体シール装置のハウジング
で、真空機器等のケーシングの壁面に、この壁面を貫通
する状態で固定される。このハウジング１の外周面とケ
ーシングの壁面に形成した通孔の内周縁との間の気密
は、通常のパッキング等により保持する。この様なハウ
ジング１の内側には回転軸２が挿通され、上記ハウジン
グ１の片半部（第４図の右半部）に設けた軸受部３の内
周面と回転軸２の外周面との間には転がり軸受４、４を
設けて、ハウジング１内での回転軸２の回転を自在とし
ている。In FIG. 4, reference numeral 1 denotes a housing of the magnetic fluid seal device, which is fixed to a wall surface of a casing of vacuum equipment or the like in a state of penetrating the wall surface. The airtightness between the outer peripheral surface of the housing 1 and the inner peripheral edge of the through hole formed in the wall surface of the casing is maintained by normal packing or the like. The rotary shaft 2 is inserted into the inside of the housing 1 as described above, and the inner peripheral surface of the bearing portion 3 and the outer peripheral surface of the rotary shaft 2 provided on one half of the housing 1 (the right half of FIG. 4). Rolling bearings 4 and 4 are provided between them to allow the rotation shaft 2 to freely rotate within the housing 1.
一方、ハウジング１の他半部（第４図の左半部）内側に
は、それぞれ複数の（図示の例ではそれぞれ４個ずつ
の）磁極片5a〜5dと永久磁石6a〜6dとを、互いに直列
に、且つ交互に設けている。On the other hand, inside the other half portion (left half portion in FIG. 4) of the housing 1, a plurality of magnetic pole pieces 5a to 5d (four in the illustrated example) and permanent magnets 6a to 6d are provided to each other. They are provided in series and alternately.
それぞれが円輪状に形成された、各永久磁石6a〜6dは、
それぞれ軸方向（第４図の左右方向）に亙って着磁され
ており、隣り合う永久磁石6a〜6dは、同極同士を対向さ
せた状態で、互いに間隔を開けて配置されている。Each of the permanent magnets 6a to 6d, each formed in a ring shape,
Each of the permanent magnets 6a to 6d is magnetized in the axial direction (the left-right direction in FIG. 4), and the adjacent permanent magnets 6a to 6d are arranged with a space therebetween with the same poles facing each other.
又、ステンレス鋼板等の磁性金属板により円環状に形成
された磁極片5a〜5dは、各永久磁石6a〜6dの間に挟持固
定されており、各磁極片5a〜5dの内、一端（第４図の右
端）の磁極片5dを除く他の磁極片5a〜5cの内周面には、
それぞれＶ字溝７、７を形成する事でこれら磁極片5a〜
5dの内周縁部を、それぞれ二股に形成している。この結
果、各磁極片5a〜5cの両端開口縁部と回転軸２の外周面
との間に、それぞれ円環状の隙間８、８が形成されてい
る。又、一端の磁極片5dの内周縁と回転軸２の外周面と
の間にも、同様の隙間8aが形成されている。Further, the magnetic pole pieces 5a to 5d formed in an annular shape by a magnetic metal plate such as a stainless steel plate are sandwiched and fixed between the permanent magnets 6a to 6d, and one of the magnetic pole pieces 5a to 5d (first Except for the pole piece 5d at the right end of FIG. 4, the inner peripheral surfaces of the other pole pieces 5a to 5c are
By forming V-shaped grooves 7 and 7, respectively, these pole pieces 5a to
The inner peripheral edge portion of 5d is formed into two forks. As a result, annular gaps 8 are formed between the opening edge portions at both ends of each of the magnetic pole pieces 5a to 5c and the outer peripheral surface of the rotary shaft 2. A similar gap 8a is also formed between the inner peripheral edge of the pole piece 5d at one end and the outer peripheral surface of the rotary shaft 2.
上記各隙間８、8aには、それぞれ磁性流体９、９を、各
永久磁石6a〜6dの磁力により保持して、磁性流体により
各隙間８、8aを塞ぎ、回転軸２の回転に拘らず、この回
転軸２の外周面とハウジング１の内周面との間の気密保
持が図られる様にしている。The magnetic fluids 9 and 9 are held in the gaps 8 and 8a by the magnetic forces of the permanent magnets 6a to 6d, and the magnetic fluids close the gaps 8 and 8a, regardless of the rotation of the rotary shaft 2. Airtightness is maintained between the outer peripheral surface of the rotary shaft 2 and the inner peripheral surface of the housing 1.
真空機器の様な、シール装置両側の圧力差が大きい部分
の気密保持を図る場合、前述の様に、磁性流体９、９を
多段に亙って保持する必要があるが、第４図に示した構
造の場合、１個の磁極片5a〜5cで磁性流体９、９を２段
に設ける事が出来、その分磁性流体シール装置に組み込
む磁極片の数を減らせる為、磁性流体シール装置の小型
化を図れる。In order to maintain the airtightness of a portion having a large pressure difference between both sides of the sealing device such as a vacuum device, it is necessary to hold the magnetic fluids 9 in multiple stages as described above. In the case of the structure described above, the magnetic fluids 9 and 9 can be provided in two stages with one magnetic pole piece 5a to 5c, and the number of magnetic pole pieces incorporated in the magnetic fluid seal device can be reduced accordingly, so that the magnetic fluid seal device Can be miniaturized.
（考案が解決しようとする課題） ところが、上述の様に構成される従来の磁性流体シール
装置の場合、磁極片5a〜5cの製作が面倒で、磁性流体シ
ール装置全体としてコストが嵩む事が避けられなかっ
た。(Problems to be solved by the invention) However, in the case of the conventional magnetic fluid seal device configured as described above, the manufacturing of the magnetic pole pieces 5a to 5c is troublesome and the magnetic fluid seal device as a whole avoids cost increase. I couldn't do it.
即ち、各磁極片5a〜5cの内周面のＶ字溝７、７を形成す
る作業は、旋盤等を使用した切削加工によらざるを得
ず、磁極片5a〜5cの製作の手間の増大によるコストアッ
プが生じた。That is, the work of forming the V-shaped grooves 7, 7 on the inner peripheral surface of each of the magnetic pole pieces 5a to 5c must be performed by cutting using a lathe or the like, which increases the labor for manufacturing the magnetic pole pieces 5a to 5c. This caused an increase in cost.
１個の磁極片により磁性流体を２段に亙って保持する為
の構造としては、前記米国特許明細書第4605233号明細
書の他、特開昭57−208358号公報、同59−50275号公報
（上記米国特許の第１国出願に関する公開公報）、同60
−125467号公報等があるが、何れも磁極片の製作が面倒
なものであった。As a structure for holding the magnetic fluid in two stages by one magnetic pole piece, in addition to the above-mentioned US Pat. No. 4,605,233, JP-A-57-208358 and 59-50275. Gazette (publication gazette for first country application of the above US patent), 60
Although there is a publication such as -125467, the production of the magnetic pole pieces is troublesome.
本考案の磁性流体シール装置は、上述の様な不都合を解
消するものである。The magnetic fluid sealing device of the present invention eliminates the above-mentioned inconvenience.
（課題を解決する為の手段） 本考案の磁性流体シール装置は、互いに同心に配置さ
れ、互いの相対的回転を自在とされた第一、第二の部材
の周面同士の間に形成される円筒状の空間を、第一、第
二の部材同士の相対的回転を自在としたまま塞ぐシール
装置である。(Means for Solving the Problems) The magnetic fluid sealing device of the present invention is formed between the peripheral surfaces of the first and second members which are arranged concentrically with each other and are rotatable relative to each other. This is a sealing device that closes a cylindrical space that is open while allowing relative rotation between the first and second members.
この様な本考案の磁性流体シール装置は、前述した従来
の磁性流体シール装置と同様に、上記空間の半径方向寸
法よりも小さな半径方向寸法を有すると共に軸方向に亙
って着磁され、同極同士を対向させた状態で第一の部材
の周面に固定される複数の永久磁石と、磁性金属板によ
り円環状に形成され、内外両周縁の内の一方の周縁と磁
性材製の第二の部材の周面との間にそれぞれ隙間を形成
した状態で、第一の部材の周面に固定される複数の磁極
片と、上記隙間に保持される磁性流体とから構成されて
いる。但し、本考案の磁性流体シール装置に於いては、
隣り合う永久磁石の間に挟持される磁極片を、それぞれ
一方の周縁を軸方向に対して傾斜させた２枚の片素を重
ね合わせる事で構成し、この２枚の片素を重ね合わせる
場合に、両片素の一方の周縁同士が二股状に分かれる状
態にしている。Such a magnetic fluid sealing device of the present invention has a radial dimension smaller than the radial dimension of the space and is magnetized in the axial direction, as in the conventional magnetic fluid sealing device described above. A plurality of permanent magnets fixed to the peripheral surface of the first member in a state where the poles face each other, and an annular shape formed of a magnetic metal plate. It is composed of a plurality of magnetic pole pieces fixed to the peripheral surface of the first member and a magnetic fluid retained in the above-described gap in a state where a gap is formed between the peripheral surfaces of the two members. However, in the magnetic fluid seal device of the present invention,
A magnetic pole piece sandwiched between adjacent permanent magnets is configured by stacking two pieces of which one peripheral edge is inclined with respect to the axial direction, and when stacking these two pieces of magnets. In addition, one of the edges of the two pieces is divided into two forks.
（作用） 上述の様に構成される本考案の磁性流体シール装置によ
り、第一の部材の周面と第二の部材の周面との間の空間
を塞ぎ、両部材の間の気密保持を図る際の作用自体は、
前述した従来の磁性流体シール装置の場合と同様であ
り、本考案の場合、各片素の厚さ寸法を小さくする事
で、磁極片の厚さ寸法の増大を防止出来る為、磁性流体
シール装置の小型化も、前記従来品と同様に行なえる。(Operation) With the magnetic fluid sealing device of the present invention configured as described above, the space between the peripheral surface of the first member and the peripheral surface of the second member is closed, and airtightness is maintained between both members. The action itself when trying is
This is the same as the case of the conventional magnetic fluid seal device described above. In the case of the present invention, since the thickness dimension of each magnetic pole piece can be prevented from increasing by reducing the thickness dimension of each element, the magnetic fluid seal apparatus can be prevented. The miniaturization can be performed similarly to the conventional product.
更に、本考案の磁性流体シール装置の場合、隣り合う永
久磁石の間に挟持する磁極片を、２枚の片素を重ね合わ
せる事で構成している為、一方の周縁が二股に分かれた
磁極片の製作が容易となり、磁性流体シール装置の低廉
化を図る事が可能となる。Further, in the case of the magnetic fluid sealing device of the present invention, since the magnetic pole piece sandwiched between the adjacent permanent magnets is constituted by superposing two pieces of the magnetic pole piece, one magnetic pole having one forked edge is bifurcated. The piece can be easily manufactured, and the magnetic fluid seal device can be manufactured at low cost.
（実施例） 次に、図示の実施例を説明しつつ、本考案を更に詳しく
説明する。(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.
第１図は本考案の第一実施例を示す半部断面図である。FIG. 1 is a half sectional view showing a first embodiment of the present invention.
この第１図に於いて１は、第一の部材に相当するハウジ
ング、２は第二の部材に相当する回転軸であり、これら
ハウジング１と回転軸２とは、転がり軸受４、４を介し
て互いに同心に配置されており、ハウジング１の内側で
の回転軸２の回転を自在としている。In FIG. 1, 1 is a housing corresponding to the first member, 2 is a rotating shaft corresponding to the second member, and these housing 1 and the rotating shaft 2 are provided with rolling bearings 4 and 4 therebetween. Are arranged concentrically with each other, and the rotation shaft 2 can freely rotate inside the housing 1.
これらハウジング１の内周面と回転軸２の外周面との間
に存在する円筒状の空間10を、回転軸２の回転を自在と
したまま塞ぐ為、この空間10内には、前述した従来の磁
性流体シール装置（第４図）と同様に、それぞれ複数の
永久磁石6a〜6dと磁極片11a〜11eが、互いに直列に、且
つ交互に設けられている。Since the cylindrical space 10 existing between the inner peripheral surface of the housing 1 and the outer peripheral surface of the rotary shaft 2 is closed while allowing the rotary shaft 2 to rotate freely, the space 10 is provided in the space as described above. Similar to the magnetic fluid sealing device (FIG. 4), a plurality of permanent magnets 6a to 6d and magnetic pole pieces 11a to 11e are provided in series and alternately.
外径をハウジング１の内径とほぼ同じとし、内径を回転
軸２の外径よりも大きくする事で、上記空間10の半径方
向（第１図の上下方向）寸法Ｗよりも小さな半径方向寸
法ｗ（Ｗ＞ｗ）を有する各永久磁石6a〜6dは、それぞれ
軸方向（第１図の左右方向）に亙って着磁されており、
同極同士（Ｓ極同士、或いはＮ極同士）を対向させた状
態で、アルミニウム或は合成樹脂等の、表磁性材により
造られたハウジング１の内周面に内嵌固定している。By making the outer diameter substantially the same as the inner diameter of the housing 1 and making the inner diameter larger than the outer diameter of the rotary shaft 2, a radial dimension w smaller than the radial dimension (vertical direction in FIG. 1) W of the space 10 described above. Each of the permanent magnets 6a to 6d having (W> w) is magnetized in the axial direction (left-right direction in FIG. 1),
With the same poles (S poles or N poles) facing each other, they are internally fitted and fixed to the inner peripheral surface of the housing 1 made of a surface magnetic material such as aluminum or synthetic resin.
これら複数の永久磁石6a〜6d同士の間、或は両端に位置
する永久磁石6a、6dと転がり軸受４、４に突き当てられ
た非磁性材製の間座12、12との間には、ステンレス鋼
板、鋼板等の磁性金属板により円環状に形成された磁極
片11a〜11eが、それぞれ挟持固定されている。Between the plurality of permanent magnets 6a to 6d, or between the permanent magnets 6a and 6d located at both ends and the spacers 12 and 12 made of non-magnetic material abutted against the rolling bearings 4 and 4, Magnetic pole pieces 11a to 11e, which are annularly formed of a magnetic metal plate such as a stainless steel plate or a steel plate, are sandwiched and fixed.
各磁極片11a〜11eの内径Ｄは、磁性材製の回転軸２の外
径ｄよりも僅かに大きく（Ｄ＞ｄ）形成し、各磁極片11
a〜11eを回転軸２と同心に配置する事で、各磁極片11a
〜11eの内周縁と回転軸２の外周面との間に、それぞれ
円環状の隙間８、8aを形成している。The inner diameter D of each magnetic pole piece 11a to 11e is formed to be slightly larger (D> d) than the outer diameter d of the rotating shaft 2 made of a magnetic material.
By arranging a to 11e concentrically with the rotating shaft 2, each pole piece 11a
Annular gaps 8 and 8a are respectively formed between the inner peripheral edge of 11e and the outer peripheral surface of the rotary shaft 2.
そして、これら各隙間８、8aにはそれぞれ磁性流体９、
９を、永久磁石6a〜6dの磁力により各隙間８、8a部分に
形成される磁束によって、保持している。Then, the magnetic fluid 9,
9 is held by the magnetic flux of the permanent magnets 6a to 6d formed in the gaps 8 and 8a.
上記複数の磁極片11a〜11eの内、両端の磁極片11a、11e
を除く磁極片で、隣り合う永久磁石6a〜6dの間に挟持さ
れる磁極片11b、11c、11dは、それぞれ２枚の片素13、1
3を重ね合わせる事で構成している。Of the plurality of magnetic pole pieces 11a to 11e, the magnetic pole pieces 11a and 11e at both ends are provided.
The magnetic pole pieces 11b, 11c, and 11d sandwiched between the adjacent permanent magnets 6a to 6d are magnetic pole pieces other than No.
It is composed by stacking three.
本実施例の場合、これら各片素13、13は、磁性金属板を
プレスにより打ち抜き成形する事で構成されており、各
片素13、13の内周縁は、打ち抜き加工時のだれに基づ
き、一方向に向かって円錐状に傾斜した傾斜面となって
いる。尚、各片素13、13の外周縁も、打ち抜き加工時の
だれに基づき、傾斜面となるが、外周縁はハウジング１
内への位置決め固定の都合上、切削加工により、寸法を
正確に仕上げている。In the case of the present embodiment, each of these pieces 13, 13 is configured by stamping and forming a magnetic metal plate, and the inner peripheral edge of each piece 13, 13 is based on the sag during punching. It has an inclined surface that is conically inclined in one direction. The outer peripheral edge of each piece 13, 13 also becomes an inclined surface based on the sag during the punching process, but the outer peripheral edge is the housing 1
For the convenience of positioning and fixing inside, the dimensions are accurately finished by cutting.
この切削加工は、Ｖ字溝を形成する場合に比べて、遥か
に容易に行なえる。但し、外周縁のだれが小さくなる様
な打ち抜き加工を施せば、打ち抜き加工後に各片素13、
13の外周縁に切削加工を施す必要はなくなる。各片素1
3、13の外周縁に多少のだれが存在しても、各片素13、1
3の位置決めに問題が生じる事はない。This cutting process can be performed much more easily than the case where the V-shaped groove is formed. However, if punching is performed so that the sag of the outer peripheral edge becomes small, each element 13,
It is not necessary to machine the outer peripheral edge of 13. Each element 1
Even if there is some sagging on the outer edges of 3, 13, each element 13, 1
There will be no problem with the positioning of 3.
中央に位置し、隣り合う永久磁石6a〜6dの間に挟持され
る磁極片11b、11c、11dは、上述の様に打ち抜き加工に
より造られた片素13、13を２枚、互いに重ね合わせる事
で構成されているが、重ね合わせる方向を規制する事
で、これら２枚の片素13、13により構成される磁極片11
b、11c、11dの内周縁が二股状に分かれる様にしてい
る。The magnetic pole pieces 11b, 11c and 11d located in the center and sandwiched between the adjacent permanent magnets 6a to 6d are made by stacking two pieces 13 and 13 made by the punching process as described above. However, by controlling the overlapping direction, the pole piece 11 composed of these two pieces 13 and 13 is formed.
The inner peripheral edges of b, 11c and 11d are bifurcated.
即ち、互いん重ね合わせる片素13、13の裏面（打ち抜き
加工時に押型と反対側に位置する面）同士を突き合わせ
る事で、各磁極片11b、11c、11dの内径が、中央部で大
きく、両端開口部で小さくなる様にしている。That is, the inner surfaces of the respective magnetic pole pieces 11b, 11c, 11d are large in the central part by abutting the back surfaces of the pieces 13 and 13 that are overlapped with each other (the surface located on the side opposite to the die during punching). It is made smaller at the openings at both ends.
この結果、各磁極片11b、11c、11dの内周縁と回転軸２
の外周面との間の隙間８、8aに保持される磁性流体９、
９は、各磁極片11b、11c、11dの内周縁の両端２個所位
置に保持された状態となる。As a result, the inner peripheral edge of each magnetic pole piece 11b, 11c, 11d and the rotary shaft 2
Magnetic fluid 9 retained in the gaps 8 and 8a between the outer peripheral surface of the
9 is in a state of being held at two positions on both ends of the inner peripheral edge of each magnetic pole piece 11b, 11c, 11d.
尚、両端に位置し、永久磁石6a、6dと間座12、12との間
に挟持される磁極片11a、11eは、１枚の片素13のみから
構成され、この１枚の片素13から成る磁極片11a、11eの
内周縁と回転軸２の外周面との間に磁性流体９を、それ
ぞれ１段のみ設けている。The magnetic pole pieces 11a and 11e located at both ends and sandwiched between the permanent magnets 6a and 6d and the spacers 12 and 12 are composed of one piece of the element 13 only. The magnetic fluid 9 is provided between the inner peripheral edges of the magnetic pole pieces 11a and 11e and the outer peripheral surface of the rotary shaft 2 in only one step.
上述の様に構成される本考案の磁性流体シール装置の場
合も、前述した従来の磁性流体シール装置と同様に、各
磁極片11a〜11eと磁性流体９、９とにより、ハウジング
１の内周面と回転軸２の外周面との間の空間10の断面を
塞ぎ、ハウジング１の内周面と回転軸２の外周面との間
の気密保持を図る。Also in the case of the magnetic fluid sealing device of the present invention configured as described above, the inner circumference of the housing 1 is formed by the magnetic pole pieces 11a to 11e and the magnetic fluids 9 and 9 as in the conventional magnetic fluid sealing device described above. The cross section of the space 10 between the surface and the outer peripheral surface of the rotary shaft 2 is closed to maintain airtightness between the inner peripheral surface of the housing 1 and the outer peripheral surface of the rotary shaft 2.
本考案の磁性流体シール装置の場合、各磁極片11a〜11e
を構成する片素13、13の厚さ寸法を小さく出来る為、両
端を除く磁極片11b、11c、11dを２枚の片素13、13を重
ね合わせる事で構成したとしても、これら磁極片11b、1
1c、11dの厚さ寸法の増大を防止出来る。従って、磁性
流体シール装置の小型化も、前記従来品と同様に行なえ
る。In the case of the magnetic fluid seal device of the present invention, each magnetic pole piece 11a to 11e
Since the thickness dimensions of the elements 13 and 13 that make up the element can be made small, even if the magnetic pole pieces 11b, 11c, and 11d excluding both ends are formed by stacking the two elements 13 and 13, these magnetic pole pieces 11b , 1
It is possible to prevent the thickness of 1c and 11d from increasing. Therefore, the magnetic fluid seal device can be downsized in the same manner as the conventional product.
更に、本考案の磁性流体シール装置の場合、隣り合う永
久磁石6a〜6dの間に挟持する磁極片11b、11c、11dを、
打ち抜き成形により造られた２枚の片素13、13を重ね合
わせる事で構成し、打ち抜き成形時のだれを利用して、
上記各磁極片11b、11c、11dの内周縁を二股に形成して
いる為、磁性流体９、９を２段に亙って保持出来る磁極
片の製作が容易となり、磁性流体シール装置の低廉化を
図る事が可能となる。Further, in the case of the magnetic fluid seal device of the present invention, the magnetic pole pieces 11b, 11c and 11d sandwiched between the adjacent permanent magnets 6a to 6d are
It is composed by stacking two pieces 13 and 13 made by punching, and using the droop at punching,
Since the inner peripheral edge of each of the magnetic pole pieces 11b, 11c, 11d is bifurcated, it is easy to manufacture the magnetic pole piece capable of holding the magnetic fluids 9 in two steps, and the magnetic fluid seal device is inexpensive. Can be achieved.
次に、第２図は本考案の第二実施例を示している。Next, FIG. 2 shows a second embodiment of the present invention.
本実施例の場合、隣り合う永久磁石6a〜6dの間に挟持固
定される磁極片11b、11c、11dを構成する片素14、14の
内周縁部を、面押し加工により断面くさび状としてお
り、互いに重ね合わされる２枚の片素14、14の面押し方
向を互いに逆方向とする事で、上記２枚の片素14、14に
よって構成される磁極片11b、11c、11dの内周縁を二股
状に形成している。In the case of this embodiment, the inner peripheral edge portions of the elements 14, 14 constituting the magnetic pole pieces 11b, 11c, 11d that are sandwiched and fixed between the adjacent permanent magnets 6a to 6d have a wedge-shaped cross section by surface pressing. , The surface pressing directions of the two pieces 14 and 14 that are overlapped with each other are opposite to each other, so that the inner peripheral edges of the magnetic pole pieces 11b, 11c, and 11d formed by the two pieces 14 and 14 are It has a bifurcated shape.
その他の構成及び作用に就いては、前述した第一実施例
の場合と同様である。Other configurations and operations are the same as in the case of the first embodiment described above.
次に、第３図は本考案の第三実施例を示している。Next, FIG. 3 shows a third embodiment of the present invention.
本実施例の場合、隣り合う永久磁石6a〜6dの間に挟持固
定される磁極片11b、11c、11dを構成する片素15、15の
内周縁部を曲げ加工しており、互いに重ね合わされる２
枚の片素15、15の曲げ加工方向を互いに逆方向とする事
で、上記２枚の片素15、15によって構成される磁極片11
b、11c、11dの内周縁を二股状に形成している。In the case of this embodiment, the inner peripheral edge portions of the elements 15, 15 constituting the magnetic pole pieces 11b, 11c, 11d that are sandwiched and fixed between the adjacent permanent magnets 6a to 6d are bent, and are overlapped with each other. Two
By making the bending directions of the pieces 15 and 15 opposite to each other, the pole piece 11 composed of the two pieces 15 and 15 described above.
The inner peripheral edges of b, 11c and 11d are formed in a bifurcated shape.
その他の構成及び作用に就いては、前述した第一〜二実
施例の場合と同様である。Other configurations and operations are the same as those in the above-described first and second embodiments.
（考案の効果） 本考案の磁性流体シール装置は、以上に述べた通り構成
され作用する為、大きな圧力差を有する部分に気密保持
を図る為の小型のシール装置を、安価に提供する事が出
来る。(Advantages of the Invention) Since the magnetic fluid sealing device of the present invention is configured and operates as described above, it is possible to inexpensively provide a small sealing device for maintaining airtightness in a portion having a large pressure difference. I can.
第１図は本考案の第一実施例を、第２図は同第二実施例
を、第３図は同第三実施例を、それぞれ示す半部断面
図、第４図は従来の磁性流体シール装置の１例を示す断
面図である。 1:ハウジング、2:回転軸、3:軸受部、4:転がり軸受、5
a、5b、5c、5d:磁極片、6a、6b、6c、6d:永久磁石、7:V
字溝、８、8a:隙間、9:磁性流体、10:空間、11a、11b、
11c、11d,11e:磁極片、12:間座、13、14、15:片素。FIG. 1 is a half sectional view showing a first embodiment of the present invention, FIG. 2 is a second embodiment, FIG. 3 is a third embodiment, and FIG. 4 is a conventional magnetic fluid. It is sectional drawing which shows an example of a sealing device. 1: Housing, 2: Rotating shaft, 3: Bearing part, 4: Rolling bearing, 5
a, 5b, 5c, 5d: magnetic pole pieces, 6a, 6b, 6c, 6d: permanent magnet, 7: V
Grooves, 8, 8a: Gap, 9: Magnetic fluid, 10: Space, 11a, 11b,
11c, 11d, 11e: magnetic pole pieces, 12: spacers, 13, 14, 15: element.
Claims (4)
を自在とされた第一、第二の部材の周面同士の間に形成
される円筒状の空間を、第一、第二の部材同士の相対的
回転を自在としたまま塞ぐシール装置であって、上記空
間の半径方向寸法よりも小さな半径方向寸法を有すると
共に軸方向に亙って着磁され、同極同士を対向させた状
態で第一の部材の周面に固定される複数の永久磁石と、
磁性金属板により円環状に形成され、内外両周縁の内の
一方の周縁と磁性材製の第二の部材の周面との間にそれ
ぞれ隙間を形成した状態で、第一の部材の周面に固定さ
れる複数の磁極片と、上記隙間に保持される磁性流体と
から成る磁性流体シール装置に於いて、上記複数の磁極
片の内、隣り合う永久磁石の間に挟持される磁極片を、
一方の周縁を軸方向に対して傾斜させた２枚の片素を、
各片素の一方の周縁同士が二股状に分かれる状態に重ね
合わせる事で構成した事を特徴とする磁性流体シール装
置。1. A cylindrical space formed between the peripheral surfaces of first and second members which are arranged concentrically with each other and are rotatable relative to each other. A sealing device for closing relative rotation between members while allowing them to rotate freely, having a radial dimension smaller than the radial dimension of the space and being magnetized axially so that the same poles face each other. A plurality of permanent magnets fixed to the peripheral surface of the first member in a state,
The magnetic metal plate is formed into an annular shape, and a peripheral surface of the first member is formed with a gap formed between the peripheral surface of one of the inner and outer peripheral edges and the peripheral surface of the second member made of a magnetic material. In a magnetic fluid sealing device comprising a plurality of magnetic pole pieces fixed to the magnetic pole and a magnetic fluid held in the gap, among the plurality of magnetic pole pieces, a magnetic pole piece sandwiched between adjacent permanent magnets is ,
Two pieces of which one edge is inclined with respect to the axial direction are
A magnetic fluid sealing device, characterized in that it is constructed by overlapping one edge of each element into a bifurcated shape.
り造られており、互いに重ね合わされる２枚の片素の打
ち抜き方向を互いに逆方向とする事で、打ち抜き加工時
のだれに基づき、上記２枚の片素の一方の周縁同士を二
股状に分けた、請求項１に記載の磁性流体シール装置。2. The element forming the pole piece is manufactured by punching, and the two pieces of the element which are superposed on each other are made to have opposite punching directions. The magnetic fluid sealing device according to claim 1, wherein one edge of each of the two pieces is divided into two forks.
押しされており、互いに重ね合わされる２枚の片素の面
押し方向を互いに逆方向とする事で、上記２枚の片素の
一方の周縁同士を二股状に分けた、請求項１に記載の磁
性流体シール装置。3. One of the edges of the element forming the pole piece is pressed against the surface, and the pressing directions of the two elements stacked on top of each other are opposite to each other. The magnetic fluid sealing device according to claim 1, wherein one of the edges of the element is divided into two forks.
げ加工されており、互いに重ね合わされる２枚の片素の
曲げ加工方向を互いに逆方向とする事で、上記２枚の片
素の一方の周縁同士を二股状に分けた、請求項１に記載
の磁性流体シール装置。4. One of the peripheral edges of the element forming the pole piece is bent, and the two pieces of the element that are superposed on each other are bent in opposite directions, whereby the two pieces are The magnetic fluid sealing device according to claim 1, wherein one of the edges of the element is divided into two forks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3555189U JPH0640377Y2 (en) | 1989-03-30 | 1989-03-30 | Magnetic fluid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3555189U JPH0640377Y2 (en) | 1989-03-30 | 1989-03-30 | Magnetic fluid sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02127860U JPH02127860U (en) | 1990-10-22 |
| JPH0640377Y2 true JPH0640377Y2 (en) | 1994-10-19 |
Family
ID=31541006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3555189U Expired - Lifetime JPH0640377Y2 (en) | 1989-03-30 | 1989-03-30 | Magnetic fluid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0640377Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150055051A (en) * | 2012-10-18 | 2015-05-20 | 미츠비시 히타치 파워 시스템즈 가부시키가이샤 | Rotating machine |
-
1989
- 1989-03-30 JP JP3555189U patent/JPH0640377Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150055051A (en) * | 2012-10-18 | 2015-05-20 | 미츠비시 히타치 파워 시스템즈 가부시키가이샤 | Rotating machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02127860U (en) | 1990-10-22 |
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