CN112963549A - Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure - Google Patents
Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure Download PDFInfo
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- CN112963549A CN112963549A CN202110155723.9A CN202110155723A CN112963549A CN 112963549 A CN112963549 A CN 112963549A CN 202110155723 A CN202110155723 A CN 202110155723A CN 112963549 A CN112963549 A CN 112963549A
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- magnetic fluid
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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
- 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
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- 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 variable-tooth magnetic fluid sealing device based on a magnetic fluid compensation structure, which comprises: the device comprises a rotating shaft, a first O-shaped sealing ring, a sealing shell, a rubber magnetic isolation cushion pad, a variable-tooth pole shoe, a magnetic fluid, an angular contact ball bearing, a lubricating grease connecting pipe, an inner hexagonal socket head screw, a framework oil seal, a bearing end cover, a second O-shaped sealing ring, a permanent magnet, a magnetic fluid storage disc, a magnetic fluid adding connecting pipe and pole teeth. The invention adopts a sealing structure with a plurality of tooth-changing pole shoes in parallel in a limited axial space, thereby obviously improving the pressure resistance of the magnetic fluid sealing device; meanwhile, the magnetic fluid compensation structure is also provided, so that the sealing failure result caused by volatilization of magnetic fluid base carrier liquid and loss of magnetic fluid in the traditional magnetic fluid sealing structure can be effectively improved, and the service life of the magnetic fluid sealing device is remarkably prolonged.
Description
Technical Field
The invention belongs to the technical field of magnetic fluid sealing, and particularly relates to a variable-tooth magnetic fluid sealing device based on a magnetic fluid compensation structure.
Background
In the 60 s of the 20 th century, the magnetic fluid sealing technology was used for rocket liquid fuel stabilization and space suit vacuum sealing, and then gradually enters the visual field of people. The magnetic fluid seal is characterized in that an O-shaped liquid seal ring is formed in a seal gap under the action of a magnetic circuit by utilizing the characteristic that the magnetic fluid has response characteristics to a magnetic field, so that the sealing effect is achieved. The magnetic fluid seal has the characteristics of zero leakage, long service life, high reliability, low maintenance cost, strong anti-interference capability and the like, and is widely applied to various fields of aerospace, electronics, chemical industry, machinery, energy, environmental protection, medical treatment and the like at present. As is well known, the structural design of the magnetic fluid seal is a key factor for determining the magnetic induction intensity distribution and the sealing performance in the seal gap, however, the conventional magnetic fluid seal structure has a low sealing pressure resistance value, and the sealing effect of the magnetic fluid seal device is reduced or even fails along with the volatilization of the magnetic fluid base carrier liquid and the loss of the magnetic fluid in the use process.
Disclosure of Invention
In order to solve the technical problems, the invention provides a variable-tooth magnetic fluid sealing device based on a magnetic fluid compensation structure, and research results provide a novel structure for improving the pressure resistance of magnetic fluid sealing.
In order to achieve the above object, the present invention provides a variable tooth magnetic fluid sealing device based on a magnetic fluid compensation structure, comprising: the device comprises a rotating shaft, a sealing shell, a variable-tooth pole shoe, a magnetic fluid, an angular contact ball bearing, a lubricating grease connecting pipe, an inner hexagonal cylindrical head screw, a framework oil seal, a bearing end cover, a permanent magnet, a magnetic fluid storage disc, a magnetic fluid adding connecting pipe and pole teeth;
the sealing shell is a hollow cylindrical body and comprises a side surface and two end surfaces;
the side surface is a closed surface, and the magnetic fluid adding connecting pipe and the lubricating grease connecting pipe are arranged on the side surface;
one end of each of the two end faces is closed, and the other end of each of the two end faces is open; the center of the closed end surface of the sealed shell is provided with a through hole, and the sealed shell further comprises a rotating shaft which penetrates through the through hole to the inner cavity of the sealed shell; the open end face of the sealed shell is provided with a bearing end cover, and the bearing end cover and the sealed shell are fixedly connected through an inner hexagonal cylindrical head screw;
a magnetic fluid storage disc, a plurality of radially spaced tooth-changing pole shoes, an angular contact ball bearing and a framework oil seal are sequentially arranged in a closed cavity formed between the outer surface of the rotating shaft and the inner wall of the sealing shell along the axial direction; a permanent magnet is clamped between two adjacent tooth-changing pole shoes; the permanent magnet, the variable-tooth pole shoe, the magnetic fluid storage disc, the angular contact ball bearing and the framework oil seal are all annular, and the outer circular surfaces of the permanent magnet, the variable-tooth pole shoe, the magnetic fluid storage disc, the angular contact ball bearing and the framework oil seal are all abutted with the inner wall of the sealing shell;
and the inner circular surface of each radial variable-tooth pole shoe is provided with a pole tooth, a gap is formed between the pole tooth and the outer surface of the rotating shaft, and a magnetic fluid is injected into the gap.
Preferably, the inner groove of the magnetic fluid storage disc is shaped as a rounded transition curve.
Preferably, the magnetic fluid adding connecting pipe comprises a sealing pipe nut, a connecting pipe sealing gasket and a double-thread threaded connecting pipe; one end of the double-head threaded connecting pipe penetrates through the inner wall and the outer wall of the sealing shell and is fixedly connected with the through hole in the magnetic fluid storage disc; the other end of the double-end threaded connecting pipe is connected with the sealing pipe nut; the connecting pipe sealing gasket is clamped between the sealing pipe nut and the double-end threaded connecting pipe;
the magnetic fluid storage disc and the magnetic fluid adding connecting pipe form a magnetic fluid compensation device.
Preferably, the grease connecting pipe comprises a grease cover, a grease pad and a grease connecting pipe, one end of the grease connecting pipe is embedded in the sealed shell, the other end of the grease connecting pipe is fixedly connected with the grease cover, and the grease pad is clamped between the grease connecting pipe and the grease cover.
Preferably, a first O-ring seal is further disposed on the closed end surface of the seal housing; a second O-shaped sealing ring is arranged at the joint of the sealing shell and the bearing end cover; and a rubber magnetic isolation cushion pad is arranged between the magnetic fluid storage disc and the sealing shell.
Preferably, a sealing structure is formed among the sealing shell, the permanent magnet, the variable tooth pole shoe, the magnetic fluid and the rotating shaft, and a magnetic circuit is formed inside the sealing structure.
Preferably, the rotating shaft is a stepped shaft.
The invention has the beneficial effects that:
compared with the traditional pole shoe structure, the magnetic fluid sealing structure has the advantages that the sealing performance can be obviously improved, and the application range of magnetic fluid sealing is expanded. Meanwhile, a sealing structure with a plurality of parallel pole shoes is adopted in a limited axial space to improve the pressure resistance of the magnetic fluid sealing device, and the sealing device also has a magnetic fluid compensation structure which can effectively improve the sealing failure result of the traditional magnetic fluid sealing structure caused by volatilization of magnetic fluid base carrier liquid and loss of magnetic fluid, and obviously prolong the service life of the magnetic fluid sealing device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a view showing the structure of the apparatus of the present invention;
FIG. 2 is an enlarged schematic view of a portion of the magnetic fluid compensation structure of device C of the present invention;
FIG. 3 is an enlarged view of a part of a grease nipple of the apparatus A of the present invention;
FIG. 4 is an enlarged schematic view of a single variable tooth magnetic fluid sealing structure of part B of the device of the present invention;
the device comprises a rotating shaft 1, a first O-shaped sealing ring 2, a sealing shell 3, a magnetic isolation cushion rubber 4, a variable tooth pole shoe 5, a magnetic loop 6, a magnetic fluid 7, an angular contact ball bearing 8, a lubricating grease adapter tube 9, a grease cover 91, a grease pad 92, a grease adapter tube 93, a hexagon socket head cap screw 10, a framework oil seal 11, a bearing end cover 12, a second O-shaped sealing ring 13, a permanent magnet 14, a magnetic fluid storage disk 15, a magnetic fluid adding adapter tube 16, a sealing tube nut 161, a connecting tube sealing gasket 162, a double-end threaded adapter tube 163 and a pole tooth 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Based on a traditional magnetic fluid sealing structure, the invention provides a variable-tooth magnetic fluid sealing device based on a magnetic fluid compensation structure, which is mainly composed of a rotating shaft 1, a first O-shaped sealing ring 2, a sealing shell 3, a rubber magnetic isolation cushion pad 4, a variable-tooth pole shoe 5, a magnetic loop 6, a magnetic fluid 7, an angular contact ball bearing 8, a lubricating grease adapter tube 9, an inner hexagonal cylinder head screw 10, a framework oil seal 11, a bearing end cover 12, a second O-shaped sealing ring 13, a permanent magnet 14, a magnetic fluid storage disc 15, a magnetic fluid adding adapter tube 16 and pole teeth 17, wherein the rotating shaft 2 is connected with the first O-;
the sealed shell 3 is a hollow cylindrical body, the material composition is mainly aluminum, the sealed shell has the effects of reducing magnetic leakage and lightening weight, and the sealed shell comprises a side surface and two end surfaces;
wherein, the side surface of the sealed shell 3 is a closed surface, and a magnetofluid adding connecting pipe 16 and a lubricating grease connecting pipe 9 are arranged on the side surface; two end faces of the sealed shell 3 are closed at one end and open at the other end; the center of the closed end surface of the sealed shell 3 is provided with a through hole, and the sealed shell also comprises a rotating shaft 1 which is arranged from the through hole to the inner cavity of the sealed shell 3 in a penetrating way, wherein the rotating shaft 1 adopts a stepped shaft, so that the angular contact ball bearing 8 is convenient to install and position; the open end face of the sealing shell 3 is provided with a bearing end cover 12 for compressing the angular contact ball bearing 8 and the framework oil seal 11, and the framework oil seal 11 plays a role in dust prevention and auxiliary sealing. The bearing end cover 12 and the sealed shell 3 are fastened and connected through the hexagon socket head cap screws 10, and the screws are uniformly distributed.
A magnetic fluid storage disc 15, a plurality of tooth-changing pole shoes 5 which are radially spaced, an angular contact ball bearing 8 and a framework oil seal 11 are sequentially arranged in a closed cavity formed between the outer surface of the rotating shaft 1 and the inner wall of the sealing shell 3 along the axial direction; a permanent magnet 14 is clamped between two adjacent tooth-changing pole shoes 5; the permanent magnet 14, the variable-tooth pole shoe 5, the magnetic fluid storage disc 15, the angular contact ball bearing 8 and the framework oil seal 11 are all annular, and the outer circular surfaces of the permanent magnet and the variable-tooth pole shoe are abutted against the inner wall of the closed shell 3;
in order to improve the withstand voltage value of the magnetic fluid seal, the magnetic fluid seal is generally designed to be a multi-pole tooth structure, the inner circular surface of each radial tooth-changing pole shoe 5 is provided with a pole tooth 17, a gap exists between the pole tooth 17 and the outer surface of the rotating shaft 1, and the magnetic fluid 7 is injected into the gap.
In addition, in the magnetic fluid sealing device, volatilization of magnetic fluid-based carrier liquid and loss of magnetic fluid are inevitable in the operation process, but the volume of the magnetic fluid has great influence on the sealing performance of the magnetic fluid, so that a magnetic fluid compensation structure is constructed in order to ensure the sealing performance and prolong the service life of the variable-tooth magnetic fluid sealing device, referring to fig. 2, a magnetic fluid storage disc 15 and a magnetic fluid adding adapter tube 16 form the magnetic fluid compensation device, and the magnetic fluid adding adapter tube 16 further comprises a sealing tube nut 161, an adapter tube sealing gasket 162 and a double-head threaded adapter tube 163; one end of the double-end screwed connection pipe 163 penetrates through the inner and outer walls of the sealed shell 3 and is tightly connected with the through hole in the magnetic fluid storage disc 15, and the other end of the double-end screwed connection pipe 163 is connected with the sealing pipe nut 161; a joint packing 162 is interposed between the sealing tube nut 161 and the double-threaded joint 163.
The magnetic fluid storage disc 15 is arranged on the sealing shell 3, and the inner groove is designed into a smooth transition curve, so that the magnetic fluid can flow to the sealing gap conveniently to perform magnetic fluid compensation.
In order to prolong the service life of the bearing, the invention adds bearing grease into the grease connecting pipe 9, wherein the grease connecting pipe 9 comprises a grease cover 91, a grease pad 92 and a grease connecting pipe 93, one end of the grease connecting pipe 93 is embedded in the sealed shell 3, the other end is tightly connected with the grease cover 91, and the grease pad 92 is arranged between the grease connecting pipe 93 and the grease cover 91, as shown in fig. 3.
A first O-shaped sealing ring 2 is arranged on the closed end face of the sealing shell 3, and a second O-shaped sealing ring 13 is arranged at the joint of the sealing shell 3 and the bearing end cover 12, so that the auxiliary sealing effect is achieved; and a rubber magnetic isolation buffer cushion 4 is arranged between the magnetic fluid storage disc 15 and the sealing shell 3 to play a role in magnetic isolation and buffering.
Meanwhile, the seal shell 3, the permanent magnet 14, the variable-tooth pole shoe 5, the magnetic fluid 7 and the rotating shaft 1 form a novel variable-tooth magnetic fluid seal main seal structure, and as shown in fig. 4, compared with a traditional pole shoe structure, the novel variable-tooth pole shoe structure can obviously improve the seal pressure resistance value through theoretical analysis and simulation calculation. In the sealing structure, a magnetic circuit 6 is formed, and due to the existence of the magnetic circuit 6 and the magnetic fluid 7 having the magnetic field response characteristic, the magnetic fluid 7 injected into the gap of the sealing shell 3 is gathered in the sealing gap between the variable tooth pole piece 5 and the rotating shaft 1 to form a plurality of O-shaped sealing rings. When the pressures of the left side and the right side of the damaged magnetic fluid O-shaped sealing ring are equal, the magnetic fluid can be healed again due to the self-recovery characteristic of the magnetic fluid seal, and the pressure resistance is recovered.
In conclusion, the invention can obviously improve the sealing performance and expand the application range of the magnetic fluid seal. Meanwhile, a sealing structure with a plurality of parallel pole shoes is adopted in a limited axial space to improve the pressure resistance of the magnetic fluid sealing device, and the sealing device also has a magnetic fluid compensation structure which can effectively improve the sealing failure result of the traditional magnetic fluid sealing structure caused by volatilization of magnetic fluid base carrier liquid and loss of magnetic fluid, and obviously prolong the service life of the magnetic fluid sealing device.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. A variable tooth magnetic fluid sealing device based on a magnetic fluid compensation structure is characterized by comprising: the device comprises a rotating shaft (1), a sealing shell (3), a tooth-changing pole shoe (5), a magnetic fluid (7), an angular contact ball bearing (8), a lubricating grease connecting pipe (9), an inner hexagonal socket head screw (10), a framework oil seal (11), a bearing end cover (12), a permanent magnet (14), a magnetic fluid storage disc (15), a magnetic fluid adding connecting pipe (16) and pole teeth (17);
the sealing shell (3) is a hollow cylindrical body and comprises a side surface and two end surfaces;
the side surface is a closed surface, and the magnetic fluid adding connecting pipe (16) and the lubricating grease connecting pipe (9) are arranged on the side surface;
one end of each of the two end faces is closed, and the other end of each of the two end faces is open; a through hole is formed in the center of the closed end face of the sealed shell (3), and the sealed shell further comprises a rotating shaft (1) which penetrates through the through hole to the inner cavity of the sealed shell (3); a bearing end cover (12) is arranged on the open end face of the sealed shell (3), and the bearing end cover (12) is fixedly connected with the sealed shell (3) through an inner hexagonal socket head cap screw (10);
a magnetic fluid storage disc (15), a plurality of radially spaced tooth-changing pole shoes (5), an angular contact ball bearing (8) and a framework oil seal (11) are sequentially arranged in an enclosed cavity formed between the outer surface of the rotating shaft (1) and the inner wall of the sealing shell (3) along the axial direction; a permanent magnet (14) is clamped between two adjacent tooth-changing pole shoes (5); the permanent magnet (14), the tooth-changing pole shoe (5), the magnetic fluid storage disc (15), the angular contact ball bearing (8) and the framework oil seal (11) are all annular, and the outer circular surfaces of the angular contact ball bearing are abutted to the inner wall of the sealing shell (3);
the inner circular surface of each radial tooth-changing pole shoe (5) is provided with a pole tooth (17), a gap exists between the pole tooth (17) and the outer surface of the rotating shaft (1), and the gap is injected with a magnetic fluid (7).
2. The variable tooth magnetic fluid sealing device based on the magnetic fluid compensation structure according to claim 1, wherein the inner groove shape of the magnetic fluid storage disc (15) is a smooth transition curve type.
3. The variable tooth magnetic fluid sealing device based on the magnetic fluid compensation structure according to claim 1, wherein the magnetic fluid adding adapter (16) comprises a sealing pipe nut (161), an adapter sealing gasket (162) and a double-end threaded adapter (163); one end of the double-head threaded connecting pipe (163) penetrates through the inner wall and the outer wall of the sealed shell (3) and is fixedly connected with a through hole in the magnetic fluid storage disc (15); the other end of the double-end threaded connecting pipe (163) is connected with the sealing pipe nut (161); the connecting pipe sealing gasket (162) is clamped between the sealing pipe nut (161) and the double-end threaded connecting pipe (163);
the magnetic fluid storage disc (15) and the magnetic fluid adding connecting pipe (16) form a magnetic fluid compensation device.
4. The variable-tooth magnetic fluid sealing device based on the magnetic fluid compensation structure is characterized in that the grease adapter tube (9) comprises a grease cover (91), a grease pad (92) and a grease adapter tube (93), one end of the grease adapter tube (93) is embedded in the sealing shell (3), the other end of the grease adapter tube (93) is fixedly connected with the grease cover (91), and the grease pad (92) is clamped between the grease adapter tube (93) and the grease cover (91).
5. The variable-tooth magnetic fluid sealing device based on the magnetic fluid compensation structure is characterized in that a first O-shaped sealing ring (2) is further arranged on the closed end face of the sealing shell (3);
a second O-shaped sealing ring (13) is arranged at the joint of the sealing shell (3) and the bearing end cover (12);
and a rubber magnetism isolating buffer cushion (4) is arranged between the magnetic fluid storage disc (15) and the sealing shell (3).
6. The variable-tooth magnetic fluid sealing device based on the magnetic fluid compensation structure is characterized in that a sealing structure is formed among the sealing shell (3), the permanent magnet (14), the variable-tooth pole shoe (5), the magnetic fluid (7) and the rotating shaft (1), and a plurality of magnetic circuits (6) are formed inside the sealing structure.
7. The variable tooth magnetic fluid sealing device based on the magnetic fluid compensation structure according to claim 1, characterized in that the rotating shaft (1) is a stepped shaft.
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| CN202110155723.9A CN112963549B (en) | 2021-02-04 | 2021-02-04 | Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure |
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| CN202110155723.9A CN112963549B (en) | 2021-02-04 | 2021-02-04 | Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114458515A (en) * | 2022-02-10 | 2022-05-10 | 中国长江三峡集团有限公司 | Rim sealing device of hydroelectric generating set |
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