CN1011061B - Sealing device of magnetic fluid - Google Patents
Sealing device of magnetic fluidInfo
- Publication number
- CN1011061B CN1011061B CN 88104627 CN88104627A CN1011061B CN 1011061 B CN1011061 B CN 1011061B CN 88104627 CN88104627 CN 88104627 CN 88104627 A CN88104627 A CN 88104627A CN 1011061 B CN1011061 B CN 1011061B
- Authority
- CN
- China
- Prior art keywords
- magnetic
- fluid
- sealing
- magnetic fluid
- yoke
- 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
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The present invention relates to an improved magnetic fluid sealing device which is composed of a nonmagnetic cover, a magnetic source, a magnetic yoke and a sleeve barrel, wherein the magnetic source is made of magnetic material with a high magnetic energy product, an inclined plane and a circumferential groove are arranged on the surface of the inner wall of the magnetic yoke, and the magnetic source and the magnetic yoke are covered with the nonmagnetic cover, so that the magnetic field gradient can be increased, and emulsion phenomena caused by sealed fluid and a magnetic fluid interface are prevented. The improved magnetic fluid sealing device can be used for sealing gas as well as fluid and has the advantages of high pressure bearing capability and long service life, and the purpose of completely no leakage can be achieved.
Description
The present invention relates to a kind of device for sealing magnetic fluid, belong to the device class that between the surface of relative movement, realizes sealing with fluid.
Before the present invention makes, adopt the contact-type mechanical seal structure mostly for the sealing of liquid, this structure can not guarantee not leak fully, particularly is subjected to sealing material wearing and tearing, aging and Temperature Influence easily and causes leakage.
U.S. Pat-4605233 discloses a kind of device for sealing magnetic fluid, be in the surface gap of relative movement, to put into magnetic fluid, and the magnetic field that forms by permanent magnet is trapped in the above-mentioned gap magnetic fluid, keeping the pressure difference at seal arrangement two ends, or stop the surface leakage of lubricant oil along relative movement.This device comprises an outer cover, and axle and a plurality of permanent magnet are housed in the cover, between per two adjacent magnets yoke is housed, and has groove on the yoke and forms many sharp edge, forms high magnetic fields at sharp edge place, magnetic fluid is mainly concentrated be trapped near this point edge.
European patent EP-0182656 also discloses a kind of device for sealing magnetic fluid, include non magnetic outer cover, in cover, be provided with permanent magnet, and at least one yoke, yoke one end has step, form seal clearance with the axle surface, the magnetic field gradient that forms by permanent magnet is trapped in the above-mentioned seal clearance magnetic fluid, promptly realizes magnet fluid sealing.
The deficiency of said apparatus is that they mainly are the sealings that is used for gas, and is difficult to be applicable to the sealing to liquid.Because it is said apparatus is difficult to guarantee higher magnetic field gradient, normal owing to emulsification between liquid that will seal and magnetic fluid interface causes leakage.
The objective of the invention is to avoid the deficiencies in the prior art and a kind of improved device for sealing magnetic fluid is provided, both be applicable to sealing, also be applicable to sealing liquid to gas.
The objective of the invention is to reach as follows: a kind of device for sealing magnetic fluid comprises a non-magnetic screen, the magnetic source in non-magnetic screen, yoke, sleeve.The yoke inwall is provided with a plurality of grooves, and the groove two ends are the inclined-plane, groove have 2-10 circle/centimetre, the tilt angle on inclined-plane is 30 °-50 ° (with respect to vertical surfaces).Magnetic fluid is trapped under the action of a magnetic field in the slit between groove and the sleeve.This structure can guarantee to reach higher magnetic field gradient in above-mentioned slit, prevents that sealed liquid and magnetic fluid interface from emulsification taking place.For further improving magnetic field gradient, magnetic source adopts the magnetic material with high energy product.For example, can adopt NdFeB material, cerium cobalt copper product, or samarium-cobalt material is made.
Comparison prior art of the present invention has following advantage:
1. both can be used for sealing, also be applicable to sealing liquid to gas;
2. can guarantee not leak fully;
3. bearing capacity is higher;
4. working life is longer.
The drawing of accompanying drawing is described as follows:
Fig. 1 is a kind of concrete structure schematic representation that is used for the device for sealing magnetic fluid of liquid seal of the present invention.
Fig. 2 is that another kind of the present invention is used for the concrete structure schematic representation to the device for sealing magnetic fluid of liquid seal.
The present invention will be further described as follows in conjunction with the accompanying drawings: with reference to Fig. 1, a kind of device for sealing magnetic fluid that is used for liquid seal, magnetic source 4 with high energy product is sandwiched between two annular yokes 5, by magnetic source 4, yoke 5 and sleeve 3 forms closed magnetic loops, and magnetic fluid 6 is injected in the slit between yoke 5 and the sleeve 3 and seals.Two circumferential recess 8 are arranged on the inwall of yoke 5, and inclined-plane 7 is arranged, the outside is covered with non-magnetic screen 1.This magnetic liquid sealing device can guarantee that magnetic fluid works under high magnetic field gradients, thereby can prevent by the emulsification between sealing liquid body and magnetic fluid interface.
Fig. 2 is that another kind is used for the device for sealing magnetic fluid to liquid seal, and magnetic source 4 adopts axial magnetic rings, and with yoke 5, sleeve 3 forms closed magnetic loop.Magnetic fluid 6 is concentrated in groove 8, seals in magnetic source 4 and the sleeve 3 formed slits.
Claims (4)
1, a kind of device for sealing magnetic fluid comprises magnetic source 4, yoke 5, and sleeve 3, and non-magnetic screen 1 have circumferential recess 8 and inclined-plane 7 in the inner wall surface of yoke 5, it is characterized in that:
A. groove 8 have 2-10 circle/centimetre, the tilt angle on inclined-plane 7 is 30-50 ° (with respect to a vertical surface);
B. magnetic source 4 adopts the magnetic material with high energy product.
2,, it is characterized in that magnetic source 4 adopts NdFeB material to make by the described device for sealing magnetic fluid of claim 1.
3,, it is characterized in that magnetic source 4 adopts cerium cobalt copper product to make by the described device for sealing magnetic fluid of claim 1.
4,, it is characterized in that magnetic source 4 adopts samarium-cobalt material to make by the described device for sealing magnetic fluid of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104627 CN1011061B (en) | 1988-07-30 | 1988-07-30 | Sealing device of magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104627 CN1011061B (en) | 1988-07-30 | 1988-07-30 | Sealing device of magnetic fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1040085A CN1040085A (en) | 1990-02-28 |
| CN1011061B true CN1011061B (en) | 1991-01-02 |
Family
ID=4833079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88104627 Expired CN1011061B (en) | 1988-07-30 | 1988-07-30 | Sealing device of magnetic fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1011061B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104370073B (en) * | 2014-11-25 | 2017-01-25 | 中国矿业大学 | Carrier roller sealed by magnetic liquid |
-
1988
- 1988-07-30 CN CN 88104627 patent/CN1011061B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1040085A (en) | 1990-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |