Magnetic fluid seal device
US-9845889-B2 · Dec 19, 2017 · US
Magnetic fluid seal
US9816616B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9816616-B2 |
| Application number | US-201314391126-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 7, 2013 |
| Priority date | Jun 14, 2012 |
| Publication date | Nov 14, 2017 |
| Grant date | Nov 14, 2017 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A magnetic fluid seal ( 20 ) sealing between an apparatus end ( 14 ) and a rotating shaft ( 22 ) going through the apparatus end, comprising a housing ( 38 ) comprising a magnetic flux generating means ( 28 ) generating a magnetic flux and a magnetic flux transfer means ( 24, 26 ) facing to the rotating shaft with a fine clearance and transferring the magnetic flux, and placed so as to move relatively in a radial direction of the rotating shaft with respect to the apparatus end and a magnetic fluid ( 44 ) held in the fine clearance by the magnetic flux generated by the magnetic flux generating means.
First claim
Opening claim text (preview).
The invention claimed is: 1. A magnetic fluid seal between an apparatus end of an apparatus and a rotating shaft going through the apparatus end, the magnetic fluid seal comprising: a housing comprising a permanent magnet generating a magnetic flux and pole pieces facing the rotating shaft with a fine clearance and transferring the magnetic flux; and a magnetic fluid held in the fine clearance by the magnetic flux generated by the permanent magnet, wherein the housing has a cylindrical part inserted into a through hole formed at the apparatus end and a flange part connected to an end of the cylindrical part outside the apparatus and projecting in an outer radial direction, notches are formed on the flange part of the housing, and rotation stop pins which are fixed to the apparatus end are placed in the notches so as to engage with the notches, said notches being wider in the circumferential direction of the shaft than any part of the rotation stop pins extending therethrough, said rotation stop pins allowing for limited movement in the rotational direction of the shaft, and the housing is relatively movable in a radial direction of the rotating shaft, in an axial direction of the rotating shaft and in a rotation direction of the rotating shaft with respect to the apparatus end in response to a deformation or a vibration of the rotating shaft during operation. 2. The magnetic fluid seal as set forth in claim 1 , comprising a secondary seal part sealing between the housing and the apparatus end. 3. The magnetic fluid seal as set forth in claim 1 , comprising a bearing supporting the housing with respect to the rotating shaft so as to rotate relatively. 4. The magnetic fluid seal as set forth in claim 3 , comprising a secondary seal part sealing between the housing and the apparatus end.
Assignees
Inventors
Classifications
retained in the sealing gap · CPC title
- F16J15/43Primary
kept in sealing position by magnetic force · CPC title
by means of fluid · CPC title
by a magnetic field · CPC title
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Frequently asked questions
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- What does patent US9816616B2 cover?
- A magnetic fluid seal ( 20 ) sealing between an apparatus end ( 14 ) and a rotating shaft ( 22 ) going through the apparatus end, comprising a housing ( 38 ) comprising a magnetic flux generating means ( 28 ) generating a magnetic flux and a magnetic flux transfer means ( 24, 26 ) facing to the rotating shaft with a fine clearance and transferring the magnetic flux, and placed so as to move rel…
- Who is the assignee on this patent?
- Eagle Ind Co Ltd, Eagle Ind Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F16J15/43. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Nov 14 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).