CN113757384B - Magnetic fluid sealing device with axial through hole structure magnetic source - Google Patents
Magnetic fluid sealing device with axial through hole structure magnetic source Download PDFInfo
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- CN113757384B CN113757384B CN202111044178.2A CN202111044178A CN113757384B CN 113757384 B CN113757384 B CN 113757384B CN 202111044178 A CN202111044178 A CN 202111044178A CN 113757384 B CN113757384 B CN 113757384B
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- ring
- pole shoe
- axial
- permanent magnet
- hole
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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
Abstract
The invention relates to a magnetic fluid seal with a magnetic source of an axial through hole structure. The invention solves the problems of data collection, positioning, communication, difficult processing of a permanent magnet ring and the like of a common annular magnet for sealing magnetic liquid, and can place a data monitoring device, such as a temperature sensor, a speed sensor and the like, at a through hole in engineering so as to collect data; or the through hole is processed with screw thread, thereby satisfying the fixing requirement of the annular magnet, on one hand, the magnetic liquid seal well solves the problems existing in engineering, on the other hand, the permanent magnet structure becomes light, and the load of the rotating shaft is lightened.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a magnetic fluid sealing device with an axial through hole structure magnetic source.
Background
The magnetic fluid seal is characterized in that the magnetic fluid is firmly fixed in the seal gap by utilizing the magnetic field force generated by the permanent magnet in the seal gap to resist the pressure difference at two sides, thereby achieving the sealing effect.
In some sealing occasions, besides the need of sealing a sealed cabin and the external environment, the problems of addition, data collection, positioning and communication of magnetic liquid exist, referring to the field of mechanical engineering, firstly, a method is thought to be to process a communication through hole on a permanent magnet, but because the pressure resistance of a magnetic liquid sealing device is weakened to a certain extent by the structure of the through hole on the permanent magnet, and the common rubidium iron boron magnet is a brittle and hard material which is difficult to process, and the excessive processing of the rubidium iron boron magnet easily causes the permanent magnet to break, so that the magnetic liquid seal has no similar structure.
Disclosure of Invention
The invention aims to provide a magnetic fluid sealing device with an axial through hole structure magnetic source, wherein the through hole structure can be used as a placing position of a magnetic field, temperature and speed measuring device and an adding channel of magnetic liquid during working, and can also be used for processing threads, so that the weight of the sealing device is reduced, the load on a rotating shaft is reduced, and the problems of adding, data collection, positioning and communication of the magnetic liquid existing in the conventional sealing device are solved.
The patent carries out finite element simulation aiming at a large number of magnetic liquid sealing examples, analyzes the simulation result and provides a reasonable design scheme of the size and the position of the through hole structure.
The technical scheme of the invention is as follows: the magnetic fluid seal with the magnetic source with the axial through hole structure comprises a shell, a left pole shoe ring, a right pole shoe ring and a permanent magnet; the left pole shoe ring, the right pole shoe ring and the permanent magnet are arranged on the inner wall of the shell, and a gap is reserved between the inner circular surfaces of the left pole shoe ring and the right pole shoe ring and the outer circular surface of the shaft; the pole teeth are arranged on the outer circular surface of the shaft, extend to the inner circular surfaces of the left pole shoe ring and the right pole shoe ring along the radial direction, a gap is reserved between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, and the gap is filled with magnetic fluid for sealing. Permanent magnet use sintered neodymium iron boron to make, it has axial intercommunication through-hole to open on it, when the through-hole diameter is greater than the two-thirds of permanent magnet's radial width, obvious decline can appear in the withstand voltage value, sintered neodymium iron boron material belongs to the brittle and hard material of difficult processing, the through-hole oversize can lead to the processing difficulty, permanent magnet is easy to be split, for making the magnetic fluid seal can provide sufficient withstand voltage value, should set up axial intercommunication through-hole in keeping away from permanent magnet radial edge, axial intercommunication through-hole diameter will be less than the two-thirds of permanent magnet's radial width.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the number of the pole teeth arranged on the outer circular surface of the shaft is 4-10.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the size of the gap between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring is 0.05-3 mm.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the permanent magnet is an axial magnetizing permanent magnet.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the outer circular surfaces of the left pole shoe ring and the right pole shoe ring are provided with annular grooves, and sealing rings are arranged in the annular grooves.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the magnetic field generator also comprises a left magnetism isolating ring and a right magnetism isolating ring; the left magnetism isolating ring and the right magnetism isolating ring are arranged on the inner wall of the shell, the left magnetism isolating ring is located on the left side of the left pole shoe ring, and the right magnetism isolating ring is located on the right side of the right pole shoe ring.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the left bearing and the right bearing are respectively sleeved on the shaft, and the left bearing is arranged on the left side of the left magnetism isolating ring and is in contact with the left magnetism isolating ring; the right bearing is arranged on the right side of the right magnetism isolating ring and is in contact with the right magnetism isolating ring.
The invention uses a classic magnetic liquid sealing structure that a left pole shoe ring, a permanent magnet and a right pole shoe ring are sequentially arranged on the inner wall of a shell, so that magnetic lines of force of the permanent magnet form a loop through the pole shoes and a shaft, under the action of pole teeth, the design of the left pole shoe ring, the permanent magnet and the right pole shoe ring structure ensures that most of the magnetic lines of force generated by the permanent magnet reach the magnetic liquid ring-forming part through the pole teeth after passing through the pole shoes, and the occurrence of magnetic leakage can be greatly reduced. The through hole is arranged at a position far away from the rotating shaft, the diameter of the through hole is smaller than the radial width of the magnet, and the structural design can ensure that the magnetic liquid is sealed to have a sufficient pressure resistance value.
Drawings
Fig. 1 is a schematic structural diagram of a square magnetic fluid sealing device with multiple magnetic sources according to an embodiment of the present invention; the serial number designations and corresponding designations in the drawings are as follows: 1-shaft, 2-shell, 3-left pole shoe ring, 4-permanent magnet, 5-axial communication through hole, 6-right pole shoe ring, 7-pole tooth, 8-right bearing, 9-right magnetism isolating ring, 10-sealing ring, 11-left magnetism isolating ring, 12-right bearing and 13-end cover.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the magnetic fluid seal with a magnetic source with an axial through hole structure comprises a shell, a left pole shoe ring, a right pole shoe ring and a permanent magnet; the left pole shoe ring, the right pole shoe ring and the permanent magnet are arranged on the inner wall of the shell, and a gap is reserved between the inner circular surfaces of the left pole shoe ring and the right pole shoe ring and the outer circular surface of the shaft; the pole teeth are arranged on the outer circular surface of the shaft, extend to the inner circular surfaces of the left pole shoe ring and the right pole shoe ring along the radial direction, a gap is reserved between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, and the gap is filled with magnetic fluid for sealing. Permanent magnet use sintered neodymium iron boron to make, it has axial intercommunication through-hole to open on it, when the through-hole diameter is greater than the radial width's of permanent magnet two-thirds, obvious decline can appear in the withstand voltage value, sintered neodymium iron boron material belongs to the brittle and hard material of difficult processing, the through-hole oversize can lead to the processing difficulty, permanent magnet is fragile, for making the magnetic fluid seal can provide sufficient withstand voltage value, should set up the intercommunication through-hole in keeping away from the radial edge of permanent magnet, the intercommunication through-hole diameter will be less than the radial width's of permanent magnet two-thirds.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the number of the pole teeth arranged on the outer circular surface of the shaft is 4-10.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the size of the gap between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring is 0.05-3 mm.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the permanent magnet is an axial magnetizing permanent magnet.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the outer circular surfaces of the left pole shoe ring and the right pole shoe ring are provided with annular grooves, and sealing rings are arranged in the annular grooves.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the magnetic field generator also comprises a left magnetism isolating ring and a right magnetism isolating ring; the left magnetism isolating ring and the right magnetism isolating ring are arranged on the inner wall of the shell, the left magnetism isolating ring is located on the left side of the left pole shoe ring, and the right magnetism isolating ring is located on the right side of the right pole shoe ring. The magnetism isolating ring is positioned on the right side of the right pole shoe ring.
The magnetic fluid seal with the magnetic source with the axial through hole structure is characterized in that: the left bearing and the right bearing are respectively sleeved on the shaft, and the left bearing is arranged on the left side of the left magnetism isolating ring and is in contact with the left magnetism isolating ring; the right bearing is arranged on the right side of the right magnetism isolating ring and is in contact with the right magnetism isolating ring.
Claims (7)
1. A magnetic fluid seal with an axial through hole structure magnetic source comprises a shell (2), a left pole shoe ring (3), a permanent magnet (4) and a right pole shoe ring (6); the method is characterized in that: the left pole shoe ring (3), the permanent magnet (4) and the right pole shoe ring (6) are arranged on the inner wall of the shell (2), and a gap is reserved between the inner circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) and the outer circular surface of the shaft (1); the outer disc of axle (1) be equipped with utmost point tooth (7), utmost point tooth (7) extend along the interior disc of radial left pole shoe ring (3) and right pole shoe ring (6), leave the clearance with it, pack the magnetic fluid in this clearance and seal, permanent magnet (4) use sintered neodymium iron boron to make, it has axial intercommunication through-hole (5) to open on it, when the through-hole diameter is greater than two-thirds of permanent magnet's radial width, obvious decline can appear in withstand voltage value, sintered neodymium iron boron material belongs to the brittle and hard material of difficult processing, the through-hole size is too big can lead to the processing difficulty, permanent magnet is fragile, for making the magnetic fluid sealed can provide sufficient withstand voltage value, should set up axial intercommunication through-hole in keeping away from permanent magnet radial edge, axial intercommunication through-hole diameter will be less than two-thirds of permanent magnet's radial width.
2. A magnetic fluid seal with an axial through hole configuration magnetic source as claimed in claim 1 wherein: the number of the pole teeth (7) arranged on the outer circular surface of the shaft (1) is 4-10.
3. A magnetic fluid seal with an axial through hole configuration magnetic source as claimed in claim 1 wherein: the size of a gap between the pole teeth (7) and the inner circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) is 0.05-3 mm.
4. The magnetic fluid seal with an axial through hole configuration magnetic source of claim 1 wherein: the permanent magnet (4) is an axial magnetizing type permanent magnet.
5. A magnetic fluid seal with an axial through hole configuration magnetic source as claimed in claim 1 wherein: the outer circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (6) are provided with annular grooves, and sealing rings (10) are arranged in the annular grooves.
6. A magnetic fluid seal with an axial through hole configuration magnetic source as claimed in claim 1 wherein: the magnetic field isolation device also comprises a left magnetism isolation ring (11) and a right magnetism isolation ring (9); the left magnetism isolating ring (11) and the right magnetism isolating ring (9) are arranged on the inner wall of the shell (2), the left magnetism isolating ring (11) is located on the left side of the left pole shoe ring (3), and the right magnetism isolating ring (9) is located on the right side of the right pole shoe ring (6).
7. A magnetic fluid seal with an axial through hole configuration magnetic source as claimed in claim 1 wherein: the shaft is characterized by further comprising a left bearing (12) and a right bearing (8), wherein the left bearing (12) and the right bearing (8) are respectively sleeved on the shaft (1), and the left bearing (12) is arranged on the left side of the left magnetism isolating ring (11) and is in contact with the left magnetism isolating ring (11); the right bearing (8) is arranged on the right side of the right magnetism isolating ring (9) and is in contact with the right magnetism isolating ring (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111044178.2A CN113757384B (en) | 2021-09-07 | 2021-09-07 | Magnetic fluid sealing device with axial through hole structure magnetic source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111044178.2A CN113757384B (en) | 2021-09-07 | 2021-09-07 | Magnetic fluid sealing device with axial through hole structure magnetic source |
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| Publication Number | Publication Date |
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| CN113757384A CN113757384A (en) | 2021-12-07 |
| CN113757384B true CN113757384B (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111044178.2A Active CN113757384B (en) | 2021-09-07 | 2021-09-07 | Magnetic fluid sealing device with axial through hole structure magnetic source |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007258573A (en) * | 2006-03-24 | 2007-10-04 | Eagle Ind Co Ltd | Magnetic fluid sealing device |
| CN101749432A (en) * | 2010-01-28 | 2010-06-23 | 北京交通大学 | Sealing device with evenly distributed magnetic liquid |
| CN101749433A (en) * | 2010-02-08 | 2010-06-23 | 北京交通大学 | Biaxial magnetic liquid sealing structure |
| CN101776149A (en) * | 2010-03-01 | 2010-07-14 | 北京交通大学 | Low-temperature and small-diameter magnetic fluid seal device |
| CN101776150A (en) * | 2010-03-08 | 2010-07-14 | 北京交通大学 | Combined reciprocating sealing device of magnetic liquid, C-shaped slip ring and Y x type seal ring |
| CN104197024A (en) * | 2014-08-06 | 2014-12-10 | 北京交通大学 | Peristaltic pumping circulation cooling type magnetic liquid sealing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101377985B (en) * | 2007-08-31 | 2012-08-22 | 湖南维格磁流体股份有限公司 | Dynamic sealing device for middle/high voltage power switchgear |
| CN107842613B (en) * | 2017-12-13 | 2019-04-02 | 广西科技大学 | A kind of arc step formula device for sealing magnetic fluid |
-
2021
- 2021-09-07 CN CN202111044178.2A patent/CN113757384B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007258573A (en) * | 2006-03-24 | 2007-10-04 | Eagle Ind Co Ltd | Magnetic fluid sealing device |
| CN101749432A (en) * | 2010-01-28 | 2010-06-23 | 北京交通大学 | Sealing device with evenly distributed magnetic liquid |
| CN101749433A (en) * | 2010-02-08 | 2010-06-23 | 北京交通大学 | Biaxial magnetic liquid sealing structure |
| CN101776149A (en) * | 2010-03-01 | 2010-07-14 | 北京交通大学 | Low-temperature and small-diameter magnetic fluid seal device |
| CN101776150A (en) * | 2010-03-08 | 2010-07-14 | 北京交通大学 | Combined reciprocating sealing device of magnetic liquid, C-shaped slip ring and Y x type seal ring |
| CN104197024A (en) * | 2014-08-06 | 2014-12-10 | 北京交通大学 | Peristaltic pumping circulation cooling type magnetic liquid sealing device |
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| CN113757384A (en) | 2021-12-07 |
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