CN112303240B - Two-stage magnetic fluid sealing device - Google Patents
Two-stage magnetic fluid sealing device Download PDFInfo
- Publication number
- CN112303240B CN112303240B CN202010967361.9A CN202010967361A CN112303240B CN 112303240 B CN112303240 B CN 112303240B CN 202010967361 A CN202010967361 A CN 202010967361A CN 112303240 B CN112303240 B CN 112303240B
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- Prior art keywords
- magnetic fluid
- main shaft
- ring
- planet carrier
- sealing assembly
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- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 69
- 238000007789 sealing Methods 0.000 title claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 230000005389 magnetism Effects 0.000 claims description 25
- 238000002955 isolation Methods 0.000 claims 4
- 238000009434 installation Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
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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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- 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
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
-
- 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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
- F16J15/4476—Labyrinth packings with radial path
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a two-stage magnetic fluid sealing device, which comprises: the planetary gear speed reducing structure comprises a main shaft, a planet carrier, a planetary gear, a thrust bearing and a lower fixing frame, wherein the thrust bearing is assembled on the main shaft and rotates along with the main shaft at the same direction and speed, an outer gear is processed on the thrust bearing, the planet carrier is provided with a groove and is installed on the thrust bearing through the groove, the planetary gear installed on the planet carrier is meshed with the outer gear of the thrust bearing, and the lower fixing frame is processed with inner teeth and is meshed with the planetary gear installed on the planet carrier; the magnetic fluid sealing component comprises a magnetic fluid inner sealing assembly, a magnetic fluid outer sealing assembly and a movable frame, the movable frame is assembled on the planet carrier, a first-stage magnetic fluid dynamic seal is formed between the magnetic fluid inner sealing assembly and the main shaft through magnetic fluid liquid at the pole teeth, and another-stage magnetic fluid dynamic seal is formed between the magnetic fluid outer sealing assembly and the main shaft. The invention has the advantages of simple structure and convenient installation.
Description
Technical Field
The invention belongs to the field of dynamic sealing, and particularly relates to a two-stage magnetic fluid sealing device which is particularly suitable for low-pressure high-speed dynamic sealing occasions.
Background
The magnetic fluid seal has the advantages of zero leakage, long service life, high reliability and the like, and is applied to a plurality of rotary dynamic seal devices, such as the seal of vacuum equipment such as a monocrystalline silicon furnace, a vacuum smelting furnace, chemical vapor deposition, ion plating and the like. In the process of sealing the magnetic fluid and hydraulically sealing, the pressure resistance of single-stage magnetic fluid seal is limited by the centrifugal action of the high-speed rotation of the rotating shaft on the magnetic fluid, and the application of the dynamic seal at high linear speed is limited; particularly for the large-diameter high-rotation-speed magnetic fluid sealing device, the large-diameter sealing structure reduces the magnetic field intensity, so that the traditional single-stage magnetic fluid sealing device is more difficult to be suitable for the dynamic sealing of the large-diameter high-linear-speed rotating shaft.
CN110848393A discloses a multistage magnetic current body sealing device, and the device adopts second grade decelerator, adopts two sets of roller gear external gearing speed reduction form to realize speed reduction two-stage seal, has following shortcoming: (1) the cylindrical gear secondary speed reducing structure has larger structural duty, and two parallel shafts (a main shaft and a transmission shaft) exist, so that the requirement on the parallelism of the transmission shaft and the axis of the main shaft is higher; (2) bearing mounting holes are required to be formed in the upper frame and the lower frame, so that the upper frame and the lower frame are inconvenient to assemble, disassemble and replace; (3) because the magnetic fluid sealing medium is sensitive to oil, the sealing life can be shortened when the oil stain amount is increased, and the problems of large heating and serious abrasion can exist in order to ensure the sealing performance of the sealing structure and difficultly lubricate the meshing gear.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a two-stage magnetic fluid sealing device, which adopts a planetary gear reduction structure to realize a stepped reduction sealing mode.
The technical scheme adopted by the embodiment of the invention is as follows:
the embodiment of the invention provides a two-stage magnetic fluid sealing device, which comprises:
the planetary gear speed reducing structure comprises a main shaft, a planet carrier, a planetary gear, a thrust bearing and a lower fixing frame, wherein the thrust bearing is assembled on the main shaft and rotates along with the main shaft at the same speed in the same direction;
the magnetic fluid sealing component comprises a magnetic fluid inner sealing assembly, a magnetic fluid outer sealing assembly and a movable frame, the movable frame is assembled on the planet carrier, a first-stage magnetic fluid dynamic seal is formed between the magnetic fluid inner sealing assembly and the main shaft through magnetic fluid liquid at the pole teeth, and a second-stage magnetic fluid dynamic seal is formed between the magnetic fluid outer sealing assembly and the main shaft.
Further, still include: labyrinth seal structure, labyrinth seal structure includes sealed lid and upper mounting bracket, sealed lid be fixed in on the movable frame, upper mounting bracket and main shaft on all seted up the seal groove, interior labyrinth seal groove and outer labyrinth seal groove have been seted up to the sealed lid, form inlayer labyrinth seal between interior labyrinth seal groove and the main shaft, form outer labyrinth seal between outer labyrinth seal groove and the upper mounting bracket.
Furthermore, the planet carrier is provided with a positioning hole, and the movable frame is fixedly connected to the planet carrier through a positioning pin and rotates along with the planet carrier.
Furthermore, the magnetic fluid internal sealing assembly consists of two inner pole teeth, an inner magnet, an inner ring upper magnetism isolating ring and an inner ring lower magnetism isolating ring, wherein the inner magnet is assembled between the two inner pole teeth, and the inner ring upper magnetism isolating ring and the inner ring lower magnetism isolating ring are respectively assembled above and below the two inner pole teeth.
Furthermore, the magnetic fluid outer sealing assembly consists of two outer pole teeth, an outer magnet, an outer ring upper magnetism isolating ring and an outer ring lower magnetism isolating ring, wherein the outer magnet is assembled between the two outer pole teeth, and the outer ring upper magnetism isolating ring and the outer ring lower magnetism isolating ring are respectively assembled above and below the two outer pole teeth.
According to the technical scheme, the invention has the beneficial effects that: the invention adopts the planetary gear speed reducer, divides the dynamic seal between the upper fixing frame with larger relative speed and the main shaft when adopting the first-stage seal into two-stage magnetic fluid seal, reduces the influence of centrifugal force on the working stability of the magnetic fluid under high linear speed, can effectively solve the problem that the existing single-stage magnetic fluid seal is difficult to be suitable for the dynamic seal of the rotating shaft with high rotating speed and large diameter, and can play a role of dust prevention by adopting the combination of the labyrinth seal structure and the magnetic fluid seal structure, thereby being beneficial to improving the working life of the magnetic fluid seal. In addition, the invention has the advantages of fewer parts, compact structure, small occupied space and convenient installation, and the speed reduction part is more convenient to lubricate, thus being beneficial to prolonging the service life of the sealing device.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is an assembly drawing of a two-stage magnetic fluid seal device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a lower fixing frame according to an embodiment of the present invention;
FIG. 3 is a schematic view of a planet carrier in an embodiment of the present invention;
FIG. 4 is a view of planet carrier A in the embodiment of the present invention;
FIG. 5 is a schematic view of a thrust bearing in an embodiment of the present invention;
FIG. 6 is a schematic view of a mobile frame in an embodiment of the invention;
FIG. 7 is a schematic view of an inner pole tooth in an embodiment of the present invention;
FIG. 8 is a schematic view of an upper seal cover in an embodiment of the present invention;
FIG. 9 is a schematic view of the spindle in an embodiment of the present invention;
FIG. 10 is a schematic view of an outer tooth in an embodiment of the present invention;
FIG. 11 is a schematic view of an upper fixing frame according to an embodiment of the present invention;
FIG. 12 is a schematic view of a magnetism isolating ring according to an embodiment of the present invention;
in the figure: 1. a lower fixing frame; 2. a planet carrier; 3. a thrust bearing; 4. positioning pins; 5. a planet wheel; 6. a movable frame; 7. an inner ring lower magnetism isolating ring; 8. an inner magnet; 9. inner pole teeth; 10. an upper sealing cover; 11. a bolt; 12. a main shaft; 13. the inner ring is provided with a magnetism isolating ring; 14. the outer ring is provided with a magnetism isolating ring; 15. an external magnet; 16. outer pole teeth; 17. an upper fixing frame; 18. and an outer ring lower magnetism isolating ring.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings that illustrate only the basic structure of the present invention and, therefore, only show the structures related to the present invention.
It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
Referring to fig. 1-12, the present embodiment provides a two-stage magnetic fluid seal device comprising: a planetary gear reduction structure and a magnetic fluid sealing component.
Specifically, as shown in fig. 1, 2, 4, 5 and 9, the planetary gear reduction structure includes a main shaft 12, a planet carrier 2, a planetary gear 5, a thrust bearing 3 and a lower fixing frame 1, the thrust bearing 3 being fitted on a step 12-2 of the main shaft 12; as shown in fig. 4, a groove 2-3 is formed below a planet carrier 2, three planet wheel shafts are uniformly distributed, the planet carrier 2 is coaxial with a thrust bearing 3 and a main shaft 12, the planet carrier 2 is matched with a roller 3-3 on the thrust bearing 3 through the groove 2-3, the roller 3-3 is installed in the groove of a thrust bearing fixing ring 3-1 through a retainer 3-2, and the thrust bearing fixing ring 3-1 rotates at the same speed with the main shaft; the planet carrier 2 and the thrust bearing 3 are allowed to rotate relatively; 3 planet wheels 5 are uniformly distributed on a planet wheel shaft 2-2 on the planet carrier 2, and external teeth 3-4 on the thrust bearing 3 are in meshing transmission with the planet wheels 3; inner teeth 1-1 are processed on the inner ring of the lower fixed frame 1, and the inner teeth 1-1 are meshed with the planet wheel 5.
Specifically, as shown in fig. 1, fig. 6, fig. 7, fig. 10 and fig. 12, the two-stage magnetic fluid sealing assembly comprises a magnetic fluid outer sealing assembly, a magnetic fluid inner sealing assembly and a movable frame 6, the movable frame 6 is provided with a positioning hole 6-1 which is matched and fixedly arranged on the planet carrier 2 through a positioning pin 4 and a positioning hole 2-1 on the planet carrier, the magnetic fluid outer sealing assembly consists of two outer pole teeth 16, an outer magnet 15, an outer ring upper magnetism isolating ring 14 and an outer ring lower magnetism isolating ring 18, wherein the outer magnet 15 is assembled between the two outer pole teeth 16, the outer ring upper magnetism isolating ring 14 and the outer ring lower magnetism isolating ring 18 are respectively assembled above and below the two outer pole teeth 16, the magnetic fluid outer sealing assembly is assembled and installed at an outer step 6-4 on the movable frame 6, and primary magnetic fluid dynamic sealing is formed between the magnetic fluid outer sealing assembly and the upper fixed frame 17.
The magnetic fluid internal sealing assembly is composed of two inner pole teeth 9, an inner magnet 8, an inner ring upper magnetism isolating ring 13 and an inner ring lower magnetism isolating ring 7, the inner magnet 8 is assembled between the two inner pole teeth 9, the inner ring upper magnetism isolating ring 13 and the inner ring lower magnetism isolating ring 7 are respectively assembled above and below the two inner pole teeth 9, the magnetic fluid internal sealing assembly is assembled on an inner step 6-3 on the movable frame 6, and another stage of magnetic fluid dynamic sealing is formed between the inner sealing assembly and the main shaft 12.
Further, the labyrinth seal structure is further included, as shown in fig. 1, fig. 6, fig. 8, fig. 9 and fig. 11, the labyrinth seal structure includes a seal cover 10 and an upper fixing frame 17, the seal cover 10 is provided with an outer labyrinth seal groove 10-2, an inner labyrinth seal groove 10-3 and a bolt hole 10-1, the main shaft 12 is processed with a seal groove 12-1, and the upper fixing frame 17 is provided with a seal groove 17-1; the sealing cover 10 is fixedly installed on the movable frame 3 through the matching of the bolt 11 and the bolt hole 6-2, an inner layer labyrinth seal is formed between the sealing groove 10-2 and the sealing groove 12-1, and an outer layer labyrinth seal is formed between the sealing groove 10-1 and the sealing groove 17-1.
The working principle is as follows: as shown in fig. 1, the thrust bearing 3 rotates with the main shaft 12 in the same speed and the same direction, and is in mesh transmission with the planet gear through an external gear on the thrust bearing 3, and simultaneously, the planet carrier 2 and the main shaft 12 rotate in different speeds in the same direction through the rotation of the planet gear 5 and the revolution around the main shaft 12, and a rotation speed difference is formed between the planet carrier 2 and the main shaft 12 after the speed reduction; the movable frame 6 rotates along with the planet carrier 2, the rotation direction of the movable frame is the same as that of the main shaft 12, and the rotation speed of the movable frame is less than that of the main shaft 12; the magnetic fluid inner sealing assembly and the magnetic fluid outer sealing assembly rotate along with the movable frame 6, the magnetic fluid inner sealing assembly and the main shaft 12 form one stage of magnetic fluid dynamic seal at the inner pole tooth position, and the magnetic fluid outer sealing assembly forms the other stage of magnetic fluid dynamic seal between the outer pole tooth position and the upper fixed frame 1.
The problem of sealing failure caused by overhigh rotating speed of a main shaft with a large shaft diameter and overlarge centrifugal force when single-stage sealing is adopted can be solved through the planetary gear speed reducing structure, the sealing requirements of high linear speed and large-diameter shaft necks are met by reducing the relative rotating speed of all stages of sealing, and the planetary gear speed reducing structure has the advantages of few parts, convenience in assembly and compact structure.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: without departing from the working principle of the invention, improvements and refinements can be made, and the improvements and refinements should be regarded as the protection scope of the invention.
Claims (4)
1. A two-stage magnetic fluid seal device, comprising:
the planetary gear speed reducing structure comprises a main shaft, a planet carrier, a planetary gear, a thrust bearing and a lower fixing frame, wherein the thrust bearing is assembled on the main shaft and rotates along with the main shaft at the same speed in the same direction;
the magnetic fluid sealing component comprises a magnetic fluid inner sealing assembly, a magnetic fluid outer sealing assembly and a movable frame, the movable frame is assembled on the planet carrier, a first-stage magnetic fluid dynamic seal is formed between the magnetic fluid inner sealing assembly and the main shaft through magnetic fluid liquid at the pole teeth, and a second-stage magnetic fluid dynamic seal is formed between the magnetic fluid outer sealing assembly and the main shaft;
further comprising:
labyrinth seal structure, labyrinth seal structure includes sealed lid and upper mounting bracket, sealed lid be fixed in on the movable frame, upper mounting bracket and main shaft on all seted up the seal groove, interior labyrinth seal groove and outer labyrinth seal groove have been seted up to the sealed lid, form inlayer labyrinth seal between interior labyrinth seal groove and the main shaft, form outer labyrinth seal between outer labyrinth seal groove and the upper mounting bracket.
2. The two-stage magnetic fluid sealing device according to claim 1, wherein the planet carrier is provided with positioning holes, and the movable frame is fixedly connected to the planet carrier through the positioning pins and rotates along with the planet carrier.
3. The two-stage magnetic fluid sealing device according to claim 1, wherein the magnetic fluid inner sealing assembly comprises two inner pole teeth, an inner magnet, an inner ring upper magnetism isolating ring and an inner ring lower magnetism isolating ring, the inner magnet is arranged between the two inner pole teeth, and the inner ring upper magnetism isolating ring and the inner ring lower magnetism isolating ring are respectively arranged above and below the two inner pole teeth.
4. The two-stage magnetic fluid sealing device according to claim 1, wherein the magnetic fluid outer sealing assembly comprises two outer pole teeth, an outer magnet, an outer ring upper magnetic isolation ring and an outer ring lower magnetic isolation ring, the outer magnet is arranged between the two outer pole teeth, and the outer ring upper magnetic isolation ring and the outer ring lower magnetic isolation ring are respectively arranged above and below the two outer pole teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010967361.9A CN112303240B (en) | 2020-09-15 | 2020-09-15 | Two-stage magnetic fluid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010967361.9A CN112303240B (en) | 2020-09-15 | 2020-09-15 | Two-stage magnetic fluid sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112303240A CN112303240A (en) | 2021-02-02 |
| CN112303240B true CN112303240B (en) | 2022-05-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010967361.9A Active CN112303240B (en) | 2020-09-15 | 2020-09-15 | Two-stage magnetic fluid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112303240B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284605A (en) * | 1980-05-14 | 1981-08-18 | Ferrofluidics Corporation | Linear drive shaft seal |
| JP2017192360A (en) * | 2016-04-22 | 2017-10-26 | グローブライド株式会社 | Fishing reel and its assembling method |
| CN110848393A (en) * | 2019-10-17 | 2020-02-28 | 浙江大学 | Multistage magnetic fluid sealing device |
-
2020
- 2020-09-15 CN CN202010967361.9A patent/CN112303240B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4284605A (en) * | 1980-05-14 | 1981-08-18 | Ferrofluidics Corporation | Linear drive shaft seal |
| JP2017192360A (en) * | 2016-04-22 | 2017-10-26 | グローブライド株式会社 | Fishing reel and its assembling method |
| CN110848393A (en) * | 2019-10-17 | 2020-02-28 | 浙江大学 | Multistage magnetic fluid sealing device |
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| Publication number | Publication date |
|---|---|
| CN112303240A (en) | 2021-02-02 |
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