CN108799504B - High pressure resistant type magnetic fluid rotary seal structure - Google Patents
High pressure resistant type magnetic fluid rotary seal structure Download PDFInfo
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- CN108799504B CN108799504B CN201810915779.8A CN201810915779A CN108799504B CN 108799504 B CN108799504 B CN 108799504B CN 201810915779 A CN201810915779 A CN 201810915779A CN 108799504 B CN108799504 B CN 108799504B
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- 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
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Abstract
The invention discloses a high-pressure-resistant magnetic fluid rotary sealing structure which comprises a hollow shell, wherein one end of the shell is closed, the other end of the shell is open, a through hole is formed in the center of the closed end face of the shell, the high-pressure-resistant magnetic fluid rotary sealing structure also comprises a shaft penetrating through the through hole to the inner cavity of the shell, a plurality of annular pole shoes are arranged in a space between the outer surface of the shaft and the inner wall of the shell at intervals along the axial direction, axial magnetizing permanent magnetic rings are clamped between every two adjacent pole shoes, the polarities of the magnetic poles of the adjacent axial magnetizing permanent magnetic rings are opposite, pole teeth are arranged on the outer circular surface of the shaft and correspond to the position of each pole shoe, gaps exist between the pole teeth and; the outer diameters of all the pole teeth are equal; the inner diameters of the pole shoes are sequentially decreased from the high-pressure side to the low-pressure side, and the gaps between the pole teeth and the inner circular surfaces of the pole shoes are sequentially decreased. According to the invention, through the change of the structure, the situation that the pressure resistance is gradually enhanced is formed, the loss of the magnetic fluid can be avoided, and the effect of further improving the sealing pressure resistance is achieved.
Description
Technical Field
The invention belongs to the sealing technology of mechanical engineering, and particularly relates to a high-pressure-resistant magnetic fluid rotary sealing structure.
Background
The existing magnetic fluid rotary sealing structure generally comprises a shell with a hollow cavity and a shaft, wherein a permanent magnet and a pole shoe are arranged between the shaft and the shell for magnetic fluid sealing, and the inner ring of the pole shoe is provided with pole teeth.
There are generally two methods for improving the pressure resistance of the magnetic fluid seal: first, it is desirable to increase the magnetic field strength; second, the saturation magnetization of the magnetic fluid is increased. Most of the starting points are considered from the aspect of improving the magnetic field intensity, but the sealing performance of the existing magnetic fluid is not perfect, and still has the space for further improvement. Such as the loss of magnetic fluid during operation.
In addition, in the multi-stage sealing structure in the prior art, the number of pole teeth on each pole shoe is the same. The inventor finds out through experiments that if the pressure resistance of the magnetic fluid seal of the high-pressure side pole shoe in two adjacent pole shoes is larger than that of the magnetic fluid seal of the adjacent low-pressure side pole shoe from the high-pressure side to the low-pressure side, the magnetic fluid seal of the low-pressure side does not work, namely the seal of the low-pressure side is similar to a dummy. For the multi-stage sealing structure, since the magnetic fluid sealing on the low-pressure side cannot play a role, the arrangement of the pole shoes in multiple stages only increases the volume of the magnetic fluid rotary sealing structure, and wastes more cost.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a magnetic fluid rotary seal structure capable of improving the sealing pressure resistance.
The technical scheme for solving the problems is as follows: a high-pressure-resistant magnetic fluid rotary sealing structure comprises a hollow shell, wherein one end of the shell is closed, the other end of the shell is open, a through hole is formed in the center of the closed end face of the shell, the high-pressure-resistant magnetic fluid rotary sealing structure further comprises a shaft penetrating through the through hole to the inner cavity of the shell, a plurality of annular pole shoes are arranged in a space between the outer surface of the shaft and the inner wall of the shell at intervals along the axial direction, an axial magnetizing permanent magnetic ring is clamped between every two adjacent pole shoes, the polarities of the magnetic poles of the adjacent axial magnetizing permanent magnetic rings are opposite, pole teeth are arranged on the outer circumferential surface of the shaft and correspond to the position of each pole shoe, gaps exist between the pole teeth;
the outer diameters of all the pole teeth are equal;
the inner diameters of the pole shoes are sequentially decreased from the high-pressure side to the low-pressure side, and the gaps between the pole teeth and the inner circular surfaces of the pole shoes are sequentially decreased.
Experiments prove that in the improved structure, the smaller the gap between the pole teeth and the inner circular surface of the pole shoe is, the stronger the sealing pressure resistance is, the situation that the pressure resistance is gradually enhanced and the resistance to magnetic fluid leakage is gradually increased is formed in the whole sealing structure, and the effect of further improving the sealing pressure resistance is achieved. Moreover, the pole teeth are arranged on the shaft, so that the pole teeth can prevent the magnetic fluid from losing in the axial direction, and the sealing pressure resistance is ensured.
Preferably, the amount of decrease in the clearance is 0.05 to 0.3 mm.
Preferably, the size of the gap between the pole teeth and the inner circular surface of the pole shoe is 0.05-4 mm.
Further, the number of the pole teeth on the shaft is increased in sequence from the high-pressure side to the low-pressure side.
The further improved scheme changes the number of the pole teeth, and the sealing capability of the magnetic fluid under the pole shoe at the high-pressure side is artificially manufactured to be smaller than that of the magnetic fluid under the pole shoe at the low-pressure side, so that the defect condition in the background technology can be avoided. From the high-pressure side to the low-pressure side, the pressure resistance capacity gradually rises, so that the magnetic fluid seal under all the pole shoes can play a role, and the sealing pressure resistance performance is ensured. And the clearance between the pole teeth and the inner circular surface of the pole shoe is gradually decreased, so that the effect is achieved, and two improvement modes of the clearance decreasing and the pole tooth increasing are supplemented to play a role together.
Preferably, the number of pole teeth corresponding to adjacent pole shoes differs by 1 or 2.
Preferably, the number of the pole teeth corresponding to each pole shoe is 1-15.
Preferably, the number of the pole shoes is 3-20.
Further, the shaft is a stepped shaft; a first bearing and a second bearing which are abutted with a shoulder of the shaft are arranged at two ends of the shaft, the first bearing is close to the closed end of the shell, and the second bearing is close to the open end of the shell;
the pole shoe and the axial magnetizing permanent magnet ring are positioned between the first bearing and the second bearing; a step is arranged at the closed end surface of the inner cavity of the shell;
a magnetism isolating ring is arranged between the pole shoe closest to the closed end of the shell and one end face of the first bearing, and the other end face of the first bearing is abutted against the step;
a magnetic isolating ring is arranged between the pole shoe closest to the open end of the shell and one end face of the second bearing, and the other end face of the second bearing is tightly sealed in the inner cavity of the shell through an end cover in a pressing mode.
The invention has the following remarkable effects:
1. the smaller the gap between the pole teeth and the inner circle surface of the pole shoe is, the stronger the sealing pressure resistance is, the whole sealing structure forms a situation that the pressure resistance is gradually enhanced and the magnetic fluid leakage resistance is gradually increased, thereby achieving the effect of further improving the sealing pressure resistance.
2. The pole teeth are arranged on the shaft, so that the magnetic fluid can be prevented from losing in the axial direction, and the sealing pressure resistance can be ensured.
3. Through the structural change, the sealing capability of the magnetic fluid under the pole shoe at the high-pressure side is artificially manufactured to be smaller than that of the magnetic fluid under the pole shoe at the low-pressure side, so that the defect condition in the background technology can be avoided. From the high-pressure side to the low-pressure side, the pressure resistance capacity gradually rises, so that the magnetic fluid seal under all the pole shoes can play a role, and the sealing pressure resistance performance is ensured. And the clearance between the pole teeth and the inner circular surface of the pole shoe is gradually decreased, so that the effect is achieved, and two improvement modes of the clearance decreasing and the pole tooth increasing are supplemented to play a role together.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic view of the magnetic fluid rotary sealing structure of the present invention.
Fig. 2 is a partially enlarged view of fig. 1.
In the figure: the magnetic bearing comprises a shaft 1, a shell 2, a pole shoe 3, an end cover 4, a magnetism isolating ring 5, a pole tooth 6, an axial magnetization type permanent magnet ring 7, a first bearing 11, a second bearing 12 and a step 13.
Detailed Description
As shown in fig. 1-2, a high pressure resistant magnetic fluid rotary seal structure comprises a hollow casing 2, wherein one end of the casing 2 is closed, and the other end is open. A through hole is arranged in the center of the closed end surface of the shell 2. And the shaft 1 is arranged in the inner cavity of the shell 2 from the through hole in a penetrating way.
A plurality of annular pole shoes 3 are axially spaced in the space between the outer surface of the shaft 1 and the inner wall of the housing 2. The number of the pole shoes 3 is preferably 3-20. An axial magnetizing permanent magnet ring 7 is clamped between two adjacent pole shoes 3. The polarities of the magnetic poles of the adjacent axial magnetizing type permanent magnet rings 7 are opposite.
A gap exists between the pole teeth 6 and the inner circle surface of the pole shoe 3, and magnetic fluid is injected into the gap. The size of the gap is preferably 0.05-4 mm.
All the teeth 6 have the same outer diameter.
The inner diameter of the pole shoe 3 is gradually decreased from the high-pressure side to the low-pressure side, and the gaps between the pole teeth 6 and the inner circular surface of the pole shoe 3 are gradually decreased. The amount of decrease of the clearance is 0.05 to 0.3 mm.
The number of the pole teeth 6 on the shaft 1 increases in sequence from the high pressure side to the low pressure side. The pole shoe 3 increases in width in turn. The number of the pole teeth 6 corresponding to the adjacent pole shoes 3 is different by 1 or 2.
The shaft 1 is a stepped shaft. A first bearing 11 and a second bearing 12 that abut against a shoulder of the shaft 1 are provided at both ends of the shaft 1. The first bearing 11 is adjacent the closed end of the housing 2. The second bearing 12 is adjacent the open end of the housing 2. The pole shoe 3 and the permanent magnet ring 7 of the axial magnetizing type are positioned between the first bearing 11 and the second bearing 12. A step 13 is arranged at the closed end surface of the inner cavity of the shell 2.
A magnetism isolating ring 5 is arranged between the pole shoe 3 closest to the closed end of the shell 2 and one end face of the first bearing 11, and the other end face of the first bearing 11 is abutted against the step 13;
a magnetism isolating ring 5 is arranged between the pole shoe 3 closest to the open end of the shell 2 and one end face of the second bearing 12, and the other end face of the second bearing 12 is pressed and sealed in the inner cavity of the shell 2 through an end cover 4.
Claims (8)
1. The utility model provides a high pressure resistant type magnetic current body rotary seal structure, includes hollow casing (2), casing (2) one end is sealed, the other end is opened, it has the through-hole to open at the seal end face center of casing (2), still include axle (1) of wearing to establish to casing (2) inner chamber from the through-hole, be equipped with a plurality of cyclic annular pole shoes (3) along axial interval in the space between axle (1) surface and casing (2) inner wall, press from both sides between two adjacent pole shoes (3) and be equipped with axial magnetization type permanent magnetism ring (7), the polarity of the magnetic pole of adjacent axial magnetization type permanent magnetism ring (7) is opposite, its characterized in that: pole teeth (6) are arranged on the outer circular surface of the shaft (1) and correspond to the positions of each pole shoe (3), a gap exists between each pole tooth (6) and the inner circular surface of each pole shoe (3), and magnetic fluid is injected into the gap;
the outer diameters of all the pole teeth (6) are equal;
the inner diameter of the pole shoe (3) is gradually decreased from the high-pressure side to the low-pressure side, and the clearance between the pole teeth (6) and the inner circular surface of the pole shoe (3) is gradually decreased.
2. The high pressure resistant magnetic fluid rotary seal structure according to claim 1, characterized in that: the amount of decrease of the clearance is 0.05 to 0.3 mm.
3. The high pressure resistant magnetic fluid rotary seal structure according to claim 2, characterized in that: the size of the gap between the pole teeth (6) and the inner circular surface of the pole shoe (3) is 0.05-4 mm.
4. The high-pressure-resistant magnetic fluid rotary sealing structure according to any one of claims 1 to 3, characterized in that: the number of the pole teeth (6) on the shaft (1) is increased in sequence from the high-pressure side to the low-pressure side.
5. The high pressure resistant magnetic fluid rotary seal structure according to claim 4, characterized in that: the number of the pole teeth (6) corresponding to the adjacent pole shoes (3) is different by 1 or 2.
6. The high pressure resistant magnetic fluid rotary seal structure according to claim 4, characterized in that: the number of the pole teeth (6) corresponding to each pole shoe (3) is 1-15.
7. The high-pressure-resistant magnetic fluid rotary sealing structure according to any one of claims 1 to 3, characterized in that: the number of the pole shoes (3) is 3-20.
8. The high-pressure-resistant magnetic fluid rotary sealing structure according to any one of claims 1 to 3, characterized in that: the shaft (1) is a stepped shaft; a first bearing (11) and a second bearing (12) which are abutted to a shoulder of the shaft (1) are arranged at two ends of the shaft (1), the first bearing (11) is close to the closed end of the shell (2), and the second bearing (12) is close to the open end of the shell (2);
the pole shoe (3) and the axial magnetizing permanent magnet ring (7) are positioned between the first bearing (11) and the second bearing (12); a step (13) is arranged at the closed end surface of the inner cavity of the shell (2);
a magnetism isolating ring (5) is arranged between the pole shoe (3) closest to the closed end of the shell (2) and one end face of the first bearing (11), and the other end face of the first bearing (11) is abutted against the step (13);
a magnetism isolating ring (5) is arranged between the pole shoe (3) closest to the open end of the shell (2) and one end face of the second bearing (12), and the other end face of the second bearing (12) is pressed and sealed in the inner cavity of the shell (2) through an end cover (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915779.8A CN108799504B (en) | 2018-08-13 | 2018-08-13 | High pressure resistant type magnetic fluid rotary seal structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915779.8A CN108799504B (en) | 2018-08-13 | 2018-08-13 | High pressure resistant type magnetic fluid rotary seal structure |
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| CN108799504A CN108799504A (en) | 2018-11-13 |
| CN108799504B true CN108799504B (en) | 2020-05-05 |
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| CN201810915779.8A Active CN108799504B (en) | 2018-08-13 | 2018-08-13 | High pressure resistant type magnetic fluid rotary seal structure |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112178200B (en) * | 2020-09-27 | 2021-09-24 | 清华大学 | Magnetic liquid sealing device |
| CN112392963B (en) * | 2020-11-11 | 2021-07-20 | 清华大学 | Magnetic liquid sealing device |
| CN112728110B (en) * | 2021-01-13 | 2021-12-28 | 清华大学 | Magnetic liquid sealing device |
| CN112963549B (en) * | 2021-02-04 | 2021-10-08 | 西华大学 | Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1546890A (en) * | 2003-12-10 | 2004-11-17 | 北京交通大学 | Sealing device with uniformly distributed magnetic liquid |
| CN201112258Y (en) * | 2007-08-31 | 2008-09-10 | 株洲维格磁流体有限公司 | Dynamic sealing device for medium-high voltage power switchgear |
-
2018
- 2018-08-13 CN CN201810915779.8A patent/CN108799504B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1546890A (en) * | 2003-12-10 | 2004-11-17 | 北京交通大学 | Sealing device with uniformly distributed magnetic liquid |
| CN201112258Y (en) * | 2007-08-31 | 2008-09-10 | 株洲维格磁流体有限公司 | Dynamic sealing device for medium-high voltage power switchgear |
Non-Patent Citations (1)
| Title |
|---|
| （G4）超导发电机用离心磁流体密封的研制;中国机械工程学会流体工程学会;《国外流体工程-第九届国际流体密封会议论文集》;19830531;第360页 * |
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