CN112963544B - Magnetic fluid sealing device with porous dielectric material layer - Google Patents
Magnetic fluid sealing device with porous dielectric material layer Download PDFInfo
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- CN112963544B CN112963544B CN202110287732.3A CN202110287732A CN112963544B CN 112963544 B CN112963544 B CN 112963544B CN 202110287732 A CN202110287732 A CN 202110287732A CN 112963544 B CN112963544 B CN 112963544B
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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
本发明涉及机械工程密封技术领域，尤其是涉及一种具有多孔介质材料层的磁性液体密封装置，包括壳体、转轴、第一极靴、第二极靴、永磁体和多孔介质材料层；壳体限定出腔室；转轴可转动地设在腔室内；第一极靴和第二极靴中的每一者套在转轴的外侧，第一极靴具有多个第一极齿，第二极靴具有多个第二极齿，其中转轴的第一部分在其径向上与第一极靴相对，转轴的第二部分在其径向上与第二极靴相对；永磁体套设在转轴上，永磁体在转轴的轴向上位于第一极靴和第二极靴之间；多孔介质材料层设在第一极齿、第二极齿、第一部分和第二部分中的至少一者上。本发明的密封装置具有密封耐压能力强、磁性液体密封的自我恢复能力强等优点。
The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device with a porous medium material layer, comprising a casing, a rotating shaft, a first pole piece, a second pole piece, a permanent magnet and a porous medium material layer; The body defines a cavity; the rotating shaft is rotatably arranged in the cavity; each of the first pole piece and the second pole piece is sleeved on the outside of the rotating shaft, the first pole piece has a plurality of first pole teeth, and the second pole piece The shoe has a plurality of second pole teeth, wherein the first part of the rotating shaft is opposite to the first pole shoe in its radial direction, and the second part of the rotating shaft is opposite to the second pole shoe in its radial direction; the permanent magnet is sleeved on the rotating shaft and is permanently The magnet is located between the first pole piece and the second pole piece in the axial direction of the rotating shaft; the porous dielectric material layer is provided on at least one of the first pole teeth, the second pole teeth, the first part and the second part. The sealing device of the invention has the advantages of strong sealing pressure resistance, strong self-recovery ability of magnetic liquid sealing and the like.
Description
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device with a porous medium material layer.
Background
Magnetic liquid seals are widely used in more and more industries as a sealing method capable of achieving 'zero leakage'. The working principle is that under the action of magnetic field generated by permanent magnet, the magnetic liquid placed between rotating shaft and gap of top end of pole tooth is concentrated to form an O-shaped ring, so that the gap channel is blocked to attain the goal of sealing. Along with the development of various industries, the requirement on sealing pressure resistance is higher and higher, the sealing gap below the pole teeth is one of the most important factors influencing the magnetic liquid sealing pressure resistance, and reducing the sealing gap in various ways is an effective way for increasing the magnetic liquid sealing pressure resistance. The magnetic fluid seal is a zero-leakage, pollution-free and low-energy-consumption seal, improves the pressure resistance and enhances the self-recovery capability, and is an important problem to be solved for widening the application range.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an embodiment of the present invention provides a magnetic liquid sealing device with a porous medium material layer, including a housing, a rotating shaft, a first pole shoe, a second pole shoe, a permanent magnet, and a porous medium material layer;
the housing defines a chamber; the rotating shaft is rotatably arranged in the cavity; each of the first and second pole pieces is fitted outside the rotating shaft, the first pole piece having a plurality of first pole teeth and the second pole piece having a plurality of second pole teeth, wherein a first portion of the rotating shaft is radially opposite the first pole piece and a second portion of the rotating shaft is radially opposite the second pole piece; the permanent magnet is sleeved on the rotating shaft and is positioned between the first pole shoe and the second pole shoe in the axial direction of the rotating shaft;
the layer of porous dielectric material is disposed on at least one of the first tooth, the second tooth, the first portion, and the second portion.
The magnetic liquid sealing device with the porous medium material layer has the advantages of being strong in sealing pressure resistance, strong in self-recovery capability of magnetic liquid sealing and the like.
In some embodiments, the layer of porous media material is a layer of porous graphite material.
In some embodiments, the porous medium material layer is provided on an inner peripheral surface of at least one of the first plurality of teeth, and the porous medium material layer is provided on an inner peripheral surface of at least one of the second plurality of teeth.
In some embodiments, the layer of porous media material disposed on the inner peripheral surface of the first tooth has a radial thickness of 0.05mm to 3 mm; the radial thickness of the porous medium material layer arranged on the inner circumferential surface of the second pole tooth is 0.05mm-3 mm.
In some embodiments, a radial gap between each of the first tooth and the second tooth and the rotating shaft is 0.05mm to 3mm, and a radial gap between the porous medium material layer provided on the inner circumferential surface of the first tooth and the rotating shaft is 0 to 1 mm; the radial clearance between the porous medium material layer arranged on the inner circumferential surface of the first pole tooth and the rotating shaft is 0-1 mm.
In some embodiments, the material of the layer of porous media material is a non-magnetic conducting material.
In some embodiments, the magnetic liquid seal device with a porous medium material layer according to embodiments of the present invention further comprises a first seal ring and a second seal ring;
the outer peripheral surface of the first pole shoe is provided with a first annular groove, the first sealing ring is arranged in the first annular groove, and the outer peripheral surface of the first sealing ring is attached to the inner peripheral surface of the shell;
the outer peripheral surface of the second pole shoe is provided with a second annular groove, the second sealing ring is installed in the second annular groove, and the outer peripheral surface of the second sealing ring is attached to the inner peripheral surface of the shell.
In some embodiments, the magnetic fluid seal device with a porous medium material layer according to embodiments of the present invention further comprises a first magnetism isolating ring and a second magnetism isolating ring;
the first magnetism isolating ring is arranged in the cavity, a gap is formed between the inner peripheral surface of the first magnetism isolating ring and the outer peripheral surface of the rotating shaft, and the outer peripheral surface of the first magnetism isolating ring is in contact with the inner peripheral surface of the shell;
the second magnetism isolating ring is arranged in the cavity, a gap is formed between the inner peripheral surface of the second magnetism isolating ring and the outer peripheral surface of the rotating shaft, and the outer peripheral surface of the second magnetism isolating ring is in contact with the inner peripheral surface of the shell;
the first magnetism isolating ring and the second magnetism isolating ring are arranged at intervals along the axial direction of the rotating shaft, and the first pole shoe and the second pole shoe are located between the first magnetism isolating ring and the second magnetism isolating ring in the axial direction of the rotating shaft.
In some embodiments, a magnetic fluid containment device having a layer of porous media material according to embodiments of the present invention further comprises a first bearing and a second bearing;
the first bearing is sleeved on the rotating shaft, the outer peripheral surface of the first bearing is in contact with the inner peripheral surface of the shell, the second bearing is sleeved on the rotating shaft, and the outer peripheral surface of the second bearing is in contact with the inner peripheral surface of the shell;
the first bearing and the second bearing are arranged at intervals along the axial direction of the rotating shaft, and the first magnetism isolating ring and the second magnetism isolating ring are located between the first bearing and the second bearing in the axial direction of the rotating shaft.
In some embodiments, the housing includes a main body having a first end portion and a second end portion opposite to each other in an axial direction of the rotation shaft, a first end cover provided at the first end portion of the main body, an end surface of the first bearing away from the second bearing being in contact with the first end cover, and a second end cover provided at the second end portion of the housing, an end surface of the second bearing away from the first bearing being in contact with the second end cover;
the first end part of the main body is provided with a flange extending outwards from the outer peripheral surface of the main body, the flange is provided with connecting holes arranged at intervals, a third annular groove is arranged on the end surface of the flange far away from the second end part of the main body, and a third sealing ring is arranged in the third annular groove;
the end face, close to the main body, of the second end cover is provided with a fourth annular groove, a fourth sealing ring is arranged in the fourth annular groove, and the fourth sealing ring is attached to the end face of the second end of the main body.
Drawings
Fig. 1 is a schematic structural view of a magnetic fluid sealing device having a porous medium material layer.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Reference numerals: 100 is a magnetic liquid sealing device with a porous medium material layer, 1 is a rotating shaft, 101 is a shaft sleeve, 102 is a central shaft, 103 is a first part, 104 is a second part, 2 is a shell, 201 is a main body, 2011 is a flange, 2012 is a connecting hole, 202 is a first end cover, 2021 is a first stopping surface, 203 is a second end cover, 2031 is a second stopping surface, 204 is a cavity, 3 is a porous medium material layer, 4 is a third sealing ring, 5 is a first bearing, 6 is a first magnetism isolating ring, 7 is a first sealing ring, 8 is a first pole shoe, 801 is a first pole tooth, 9 is a permanent magnet, 10 is a second sealing ring, 11 is a second pole shoe, 1101 is a second pole tooth, 12 is a second magnetism isolating ring, 13 is a screw, 14 is a fourth sealing ring, 15 is a magnetic liquid, and 16 is a second bearing.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A magnetic fluid seal apparatus 100 having a porous medium material layer according to an embodiment of the present invention is described below with reference to fig. 1 to 2. The magnetic liquid sealing device 100 with the porous medium material layer according to the embodiment of the invention comprises a shell 2, a rotating shaft 1, a first pole piece 8, a second pole piece 11, a permanent magnet 9 and the porous medium material layer 3.
The housing 2 defines a chamber 204, and the shaft 1 is rotatably disposed in the chamber 204. Each of the first pole piece 8 and the second pole piece 11 is fitted outside the rotating shaft 1. The first pole piece 8 has a plurality of first pole teeth 801 and the second pole piece 11 has a plurality of second pole teeth 1101. Wherein a first part 103 of the shaft 1 is radially opposite the first pole piece 8 and a second part 104 of the shaft 1 is radially opposite the second pole piece 11. The permanent magnet 9 is sleeved on the rotating shaft 1, and the permanent magnet 9 is positioned between the first pole shoe 8 and the second pole shoe 11 in the axial direction of the rotating shaft 1. The porous dielectric material layer 3 is provided on at least one of the first pole tooth 801, the second pole tooth 1101, the first portion 103, and the second portion 104.
Because the peripheral surface of the rotating shaft 1 generally has a radial runout amount, if the clearance between the top end of the pole tooth and the rotating shaft 1 is too small, the pole tooth is easy to collide.
In the present embodiment, the porous medium material layer 3 disposed on the inner peripheral surface of the first tooth 801 and the inner peripheral surface of the second tooth 1101 may contact with the rotating shaft 1, the porous medium material layer 3 disposed on the outer peripheral surface of the first portion 103 may contact with the inner peripheral surface of the first tooth 801, and the porous medium material layer 3 disposed on the outer peripheral surface of the second portion 104 may contact with the inner peripheral surface of the second tooth 1101. Therefore, the sealing gap between the first tooth 801 and the rotating shaft 1 and the sealing gap between the second tooth 1101 and the rotating shaft 1 can be minimized without damaging the rotating shaft 1, the first tooth 801 and the second tooth 1101, in other words, the size of the magnetic liquid 15 leakage channel can be reduced, so that the flow resistance in the sealing gap can be increased, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer can be enhanced.
Moreover, because the seal gap between the first tooth 801 and the rotating shaft 1 and the seal gap between the second tooth 1101 and the rotating shaft 1 are reduced, when the pressure difference between the two sides of the first tooth 801 or the second tooth 1101 is too large, and the magnetic liquid 15 in the seal gap between the first tooth 801 and the rotating shaft 1 and the seal gap between the second tooth 1101 and the rotating shaft 1 is broken, only the magnetic liquid 15 in the seal gap between the first tooth 801 and the rotating shaft 1 and the seal gap between the second tooth 1101 and the rotating shaft 1 and a very small amount of magnetic liquid in the porous medium material layer 3 are washed away, that is, the magnetic liquid 15 can be greatly retained in the porous medium material layer 3 in the process of pressure equalization or breaking. When the pressure difference between the two sides of the first tooth 801 or the second tooth 1101 decreases, the magnetic liquid 15 stored in the porous medium material layer 3 is redistributed to supplement the decreased volumes of the magnetic liquid 15 in the seal gap between the first tooth 801 and the rotating shaft 1 and the seal gap between the second tooth 1101 and the rotating shaft 1. Therefore, the loss amount of the magnetic liquid 15 when the magnetic liquid 15 is broken in each stage of magnetic liquid seal in the magnetic liquid sealing device 100 with the porous medium material layer can be reduced, and the self-recovery capability of the magnetic liquid seal in the magnetic liquid sealing device 100 with the porous medium material layer can be further enhanced.
In addition, the applicant found that when the first pole piece 8 and the second pole piece 11 are integrally provided as porous pole pieces, the ability of the first pole piece 8 and the second pole piece 11 to transmit a magnetic circuit is reduced, and further, the magnetic field strength gradient in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 is reduced, so that the magnetic liquid 15 cannot be well adsorbed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1, and finally, the sealing pressure resistance of the magnetic liquid in the magnetic liquid sealing device 100 with the porous medium material layer is reduced.
In the embodiment, only the porous medium material layer 3 is arranged on at least one of the first pole tooth 801, the second pole tooth 1101, the first portion 103 and the second portion 104, and the rest of the first pole shoe 8 and the second pole shoe 11 can well transmit a magnetic circuit, so that a strong magnetic field strength gradient can be formed in a sealing gap between the first pole tooth 801 and the rotating shaft 1 and a sealing gap between the second pole tooth 1101 and the rotating shaft 1, so that the magnetic liquid 15 can be firmly adsorbed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 under the magnetic acting force, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer can be further enhanced.
Therefore, the magnetic fluid sealing device 100 with the porous medium material layer according to the embodiment of the present invention has the advantages of strong sealing pressure resistance, strong self-recovery capability of the magnetic fluid seal, and the like.
It is understood that the case 2 in this embodiment is made of a non-magnetic material, and thus the case 2 made of a non-magnetic material can prevent the magnetic circuit from leaking and stabilize the magnetic field gradient in the seal gap. Meanwhile, the rotating shaft 1, the first pole shoe 8 and the second pole shoe 11 are made of magnetic conductive materials, a magnetic loop is formed between the first pole shoe 8, the permanent magnet 9, the second pole shoe 11 and the rotating shaft 1, a strong magnetic field intensity gradient is formed in a sealing gap between the first pole tooth 801 and the rotating shaft 1 and a sealing gap between the second pole tooth 1101 and the rotating shaft 1 in the magnetic loop, the magnetic liquid 15 is acted by a magnetic field force under the magnetic field intensity gradient, and the magnetic liquid 15 can be adsorbed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 under the magnetic action force to form an O-shaped ring.
It can be understood that the rotating shaft 1 can be configured as the rotating shaft 1 with the shaft sleeve 101, and can also be configured as the rotating shaft 1 without the shaft sleeve 101, and when the rotating shaft 1 is configured as the rotating shaft 1 without the shaft sleeve 101, the material of the rotating shaft 1 is a magnetic conductive material. As shown in fig. 1, the rotating shaft 1 in this embodiment includes a central shaft 102 and a shaft sleeve 101 sleeved outside the central shaft 102, wherein the material of the shaft sleeve 101 is a magnetic conductive material, the material of the central shaft 102 is a non-magnetic conductive material, and the central shaft 102 can further avoid leakage of a magnetic circuit, so that a stronger magnetic field strength gradient can be formed in a sealing gap between the first pole tooth 801 and the shaft sleeve 101 and a sealing gap between the second pole tooth 1101 and the shaft sleeve 101, so that the magnetic liquid 15 can be better adsorbed in the sealing gap between the first pole tooth 801 and the shaft sleeve 101 and the sealing gap between the second pole tooth 1101 and the shaft sleeve 101, and further the sealing pressure resistance of the magnetic liquid sealing device 100 having a porous medium material layer can be further improved.
It can be understood that two or more pole shoes may be disposed in the housing 2, and when two or more pole shoes are disposed, a permanent magnet 9 is interposed between two adjacent pole shoes, that is, the pole shoes and the permanent magnet 9 are arranged at intervals. The sealing effect when setting up more than two pole shoes is better than the sealing effect who sets up two pole shoes.
Optionally, the porous medium material layer 3 is a porous graphite material layer, but is not limited thereto. Because the graphite has good lubricating property and smooth surface, the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 can be further reduced, even if the porous graphite material layer is in surface contact or friction with the rotating shaft 1 and the first pole tooth 801 and the second pole tooth 1101, the deformation of the porous graphite material layer can be used for ensuring that the rotating shaft 1, the first pole tooth 801 and the second pole tooth 1101 are not damaged, and simultaneously ensuring a smaller sealing gap, namely, the size of a magnetic liquid 15 leakage channel can be further reduced, so that the flow resistance in the magnetic liquid sealing gap can be further increased, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer can be further enhanced. Meanwhile, the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 are smaller, so that the loss amount of the magnetic liquid 15 when the magnetic liquid 15 is broken in each stage of magnetic liquid seal in the magnetic liquid sealing device 100 with the porous medium material layer can be further reduced, and the self-recovery capability of the magnetic liquid seal in the magnetic liquid sealing device 100 with the porous medium material layer can be further enhanced.
Optionally, at least one of the first teeth 801 is provided with a porous medium material layer 3 on its inner circumferential surface, and at least one of the second teeth 1101 is provided with a porous medium material layer 3 on its inner circumferential surface.
When the porous medium material layer 3 is arranged on the inner circumferential surface of the first pole tooth 801 or the inner circumferential surface of the second pole tooth 1101, the installation positions of the first pole piece 8 and the second pole piece 11 in the axial direction of the rotating shaft 1 do not need to be strictly limited, so that the rotating shaft 1 is convenient to manufacture, and the first pole piece 8 and the second pole piece 11 are convenient to install on the rotating shaft 1. Therefore, the magnetic liquid sealing device 100 with the porous medium material layer according to the embodiment of the invention has simple structure and convenient manufacture and installation.
Alternatively, the radial thickness h of the porous medium material layer 3 provided on the inner peripheral surface of the first pole tooth 801 is 0.05mm to 3 mm. The radial thickness h of the porous medium material layer 3 provided on the inner peripheral surface of the second teeth 1101 is 0.05mm to 3 mm. Therefore, the magnetic liquid 15 stored in the porous medium material layer 3 can be timely supplemented to the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1, and the self-recovery capability of the magnetic liquid seal in the magnetic liquid sealing device 100 with the porous medium material layer can be further ensured. Meanwhile, the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 can be reduced under the condition that the rotating shaft 1, the first pole tooth 801 and the second pole tooth 1101 are not damaged, and therefore the sealing pressure-resistant capacity of the magnetic liquid sealing device 100 with the porous medium material layer can be guaranteed.
The radial clearance between each of the first pole tooth 801 and the second pole tooth 1101 and the rotating shaft 1 is 0.05mm-3mm, and the radial clearance between the porous medium material layer 3 arranged on the inner circumferential surface of the first pole tooth 801 and the rotating shaft 1 is 0-1 mm; the radial clearance between the porous medium material layer 3 arranged on the inner peripheral surface of the first pole tooth 801 and the rotating shaft 1 is 0-1 mm. Therefore, the flow resistance in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the flow resistance in the sealing gap between the second pole tooth 1101 and the rotating shaft 1 are ensured to be small, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer can be enhanced.
Here, it should be noted that the porous medium material layer 3 is capable of contacting with the outer circumferential surface of the rotating shaft 1, so that the sealing gap between the porous medium material layer 3 and the rotating shaft 1 can be reduced as much as possible, thereby increasing the sealing pressure-resistant capability and the self-recovery capability of the magnetic liquid seal device 100 having the porous medium material layer.
Preferably, the material of the porous medium material layer 3 is a non-magnetic material. Therefore, stronger magnetic field intensity gradient can be formed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1, magnetism is convenient to gather, namely, the magnetic induction intensity at the sealing gap can be further enhanced, so that the magnetic liquid 15 can be more stably adsorbed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 under the action of magnetic force, and the sealing pressure resistance in the magnetic liquid sealing device 100 with the porous medium material layer can be further enhanced.
As shown in fig. 1, the magnetic fluid sealing device 100 with a porous medium material layer according to the embodiment of the present invention further includes a first sealing ring 7 and a second sealing ring 10, the outer circumferential surface of the first pole piece 8 is provided with a first annular groove, the first sealing ring 7 is installed in the first annular groove, and the outer circumferential surface of the first sealing ring 7 is attached to the inner circumferential surface of the housing 2. The outer peripheral surface of the second pole shoe 11 is provided with a second annular groove, a second sealing ring 10 is installed in the second annular groove, and the outer peripheral surface of the second sealing ring 10 is attached to the inner peripheral surface of the shell 2.
Accordingly, the first seal ring 7 ensures the sealing performance between the first pole piece 8 and the inner circumferential surface of the housing 2, and the second seal ring 10 ensures the sealing performance between the second pole piece 11 and the inner circumferential surface of the housing 2, thereby further improving the sealing performance of the magnetic fluid sealing device 100 having the porous medium material layer.
As shown in fig. 1, the magnetic fluid sealing apparatus 100 having a porous medium material layer according to the embodiment of the present invention further includes a first magnetism isolating ring 6 and a second magnetism isolating ring 12, the first magnetism isolating ring 6 is disposed in the chamber 204, a gap is provided between an inner circumferential surface of the first magnetism isolating ring 6 and an outer circumferential surface of the rotating shaft 1, and the outer circumferential surface of the first magnetism isolating ring 6 is in contact with an inner circumferential surface of the housing 2. The second magnetism isolating ring 12 is disposed in the cavity 204, a gap is formed between the inner circumferential surface of the second magnetism isolating ring 12 and the outer circumferential surface of the rotating shaft 1, and the outer circumferential surface of the second magnetism isolating ring 12 contacts with the inner circumferential surface of the housing 2. The first magnetism isolating ring 6 and the second magnetism isolating ring 12 are arranged at intervals along the axial direction of the rotating shaft 1, and the first pole shoe 8 and the second pole shoe 11 are located between the first magnetism isolating ring 6 and the second magnetism isolating ring 12 in the axial direction of the rotating shaft 1.
Specifically, as shown in fig. 1, a first magnetism isolating ring 6 and a second magnetism isolating ring 12 are arranged at left and right intervals, the first magnetism isolating ring 6 is located on the left side of a first pole shoe 8, the first magnetism isolating ring 6 isolates the first pole shoe 8 from other components on the left end portion of a rotating shaft 1, the second magnetism isolating ring 12 is located on the right side of a second pole shoe 11, and the second magnetism isolating ring 12 isolates the second pole shoe 11 from other components on the right end portion of the rotating shaft 1. Therefore, leakage of a magnetic circuit between the permanent magnet 9, the first pole shoe 8, the rotating shaft 1 and the second pole shoe 11 can be avoided, magnetic field intensity gradients in a sealing gap between the first pole tooth 801 and the rotating shaft 1 and in a sealing gap between the second pole tooth 1101 and the rotating shaft 1 are stabilized, the magnetic liquid 15 can be stably adsorbed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and in the sealing gap between the second pole tooth 1101 and the rotating shaft 1 under the magnetic acting force, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer can be further enhanced. The left-right direction is shown by arrow C in fig. 1.
As shown in fig. 1, the magnetic fluid sealing device 100 having a porous medium material layer according to the embodiment of the present invention further includes a first bearing 5 and a second bearing 16, the first bearing 5 is fitted on the rotating shaft 1, and the outer circumferential surface of the first bearing 5 is in contact with the inner circumferential surface of the housing 2. The second bearing 16 is sleeved on the rotating shaft 1, and the outer peripheral surface of the second bearing 16 is in contact with the inner peripheral surface of the shell 2. The first bearing 5 and the second bearing 16 are arranged at intervals along the axial direction of the rotating shaft 1, and the first magnetism isolating ring 6 and the second magnetism isolating ring 12 are located between the first bearing 5 and the second bearing 16 in the axial direction of the rotating shaft 1, so that the first magnetism isolating ring 6 can position the first bearing 5 in the axial direction of the rotating shaft 1, and the second magnetism isolating ring 12 can position the second bearing 16 in the axial direction of the rotating shaft 1.
As shown in fig. 1, the housing 2 includes a main body 201, a first end cover 202, and a second end cover 203, the main body 201 having a first end portion (left end portion) and a second end portion (right end portion) that are opposite in the axial direction of the rotation shaft 1. The first end cover 202 is disposed at a first end portion (left end portion) of the main body 201, an end surface of the first bearing 5, which is far away from the second bearing 16, contacts the first end cover 202, the first end cover 202 can position the first bearing 5 in the axial direction of the rotating shaft 1, the first end cover 202 is disposed with a first stop surface 2021, and the first bearing 5 is fixedly mounted between the first stop surface 2021 and the first magnetism isolating ring 6. The second end cover 203 is arranged at the second end (right end) of the housing 2, the end surface of the second bearing 16 far away from the first bearing 5 contacts with the second end cover 203, the second end cover 203 can position the second bearing 16 in the axial direction of the rotating shaft 1, the second end cover 203 is provided with a second stopping surface 2031, and the second bearing 16 is fixedly arranged between the second stopping surface 2031 and the second magnetism isolating ring 12.
The first end (left end) of the main body 201 is provided with a flange 2011 extending outwards from the outer peripheral surface of the main body 201, the flange 2011 is provided with connecting holes 2012 arranged at intervals, the end surface of the second end (right end) of the flange 2011 far away from the main body 201 is provided with a third annular groove, and a third sealing ring 4 is arranged in the third annular groove. Thereby facilitating the sealing connection of the magnetic liquid seal device 100 with the porous medium material layer with the device to be sealed through the flange 2011.
A fourth annular groove is formed in the end face, adjacent to the main body 201, of the second end cover 203, a fourth sealing ring 14 is arranged in the fourth annular groove, and the fourth sealing ring 14 is attached to the end face of the second end of the main body 201. Thereby, the fourth seal ring 14 can ensure the sealing performance between the end surface of the second end cap 203 adjacent to the main body 201 and the second end portion of the main body 201, thereby further improving the sealing performance of the magnetic liquid sealing device 100 having the porous medium material layer.
A magnetic fluid seal apparatus 100 having a porous medium material layer according to an embodiment of the present invention will be described in detail in a specific embodiment with reference to fig. 1 to 2. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
As shown in fig. 1 and 2, a magnetic fluid sealing device 100 having a porous medium material layer includes a housing 2, a rotating shaft 1, a first pole piece 8, a second pole piece 11, a permanent magnet 9, and a porous medium material layer 3. The rotating shaft 1 includes a central shaft 102 and a sleeve 101 fitted around the central shaft 102.
The housing 2 defines a chamber 204, and the shaft 1 is rotatably disposed in the chamber 204. Each of the first pole piece 8 and the second pole piece 11 is fitted outside the rotating shaft 1, an inner peripheral surface of the first pole piece 8 has a plurality of first pole teeth 801 arranged at intervals in an axial direction of the rotating shaft 1, and an inner peripheral surface of the second pole piece 11 has a plurality of second pole teeth 1101 arranged at intervals in the axial direction of the rotating shaft 1, wherein the first portion 103 of the rotating shaft 1 is opposite to the first pole piece 8 in a radial direction thereof, and the second portion 104 of the rotating shaft 1 is opposite to the second pole piece 11 in the radial direction thereof. The permanent magnet 9 is sleeved on the rotating shaft 1, and the permanent magnet 9 is positioned between the first pole shoe 8 and the second pole shoe 11 in the axial direction of the rotating shaft 1. The outer peripheral surface of each of the first pole piece 8, the second pole piece 11 and the permanent magnet 9 is in clearance fit or transition fit with the inner peripheral surface of the shell 2.
A porous medium material layer 3 is provided on an inner peripheral surface of each of the plurality of first teeth 801, and a porous medium material layer 3 is provided on an inner peripheral surface of each of the plurality of second teeth 1101. The porous dielectric material layer 3 may be a plating layer of a porous dielectric material provided on the inner circumferential surfaces of the first tooth 801 and the second tooth 1101, and the porous dielectric material layer 3 is a porous graphite material layer, but is not limited thereto.
The radial thickness h of the porous medium material layer 3 arranged on the inner circumferential surface of the first pole tooth 801 is 0.05mm-3 mm; the radial thickness h of the porous medium material layer 3 provided on the inner peripheral surface of the second teeth 1101 is 0.05mm to 3 mm. The radial clearance between each of the first tooth 801 and the second tooth 1101 and the shaft 1 is 0.05mm-3 mm. The radial clearance between the porous medium material layer 3 arranged on the inner peripheral surface of the first pole tooth 801 and the rotating shaft 1 is 0-0.3 mm. The radial clearance between the porous medium material layer 3 arranged on the inner peripheral surface of the first pole tooth 801 and the rotating shaft 1 is 0-0.3 mm.
The magnetic fluid seal device 100 with a porous medium material layer further comprises a first seal ring 7 and a second seal ring 10. The outer peripheral surface of the first pole shoe 8 is provided with a first annular groove, the first sealing ring 7 is arranged in the first annular groove, and the outer peripheral surface of the first sealing ring 7 is attached to the inner peripheral surface of the shell 2. The outer peripheral surface of the second pole shoe 11 is provided with a second annular groove, a second sealing ring 10 is installed in the second annular groove, and the outer peripheral surface of the second sealing ring 10 is attached to the inner peripheral surface of the shell 2. The first sealing ring 7 and the second sealing ring 10 are both O-shaped rings.
The magnetic fluid seal device 100 with a porous medium material layer further comprises a first magnetism isolating ring 6 and a second magnetism isolating ring 12. The first magnetism isolating ring 6 is arranged in the cavity 204, a gap is arranged between the inner circumferential surface of the first magnetism isolating ring 6 and the outer circumferential surface of the rotating shaft 1, and the outer circumferential surface of the first magnetism isolating ring 6 is in contact with the inner circumferential surface of the shell 2. The second magnetism isolating ring 12 is disposed in the cavity 204, a gap is formed between the inner circumferential surface of the second magnetism isolating ring 12 and the outer circumferential surface of the rotating shaft 1, and the outer circumferential surface of the second magnetism isolating ring 12 contacts with the inner circumferential surface of the housing 2. The first magnetism isolating ring 6 and the second magnetism isolating ring 12 are arranged at intervals along the axial direction of the rotating shaft 1, the first pole shoe 8 and the second pole shoe 11 are located between the first magnetism isolating ring 6 and the second magnetism isolating ring 12 in the axial direction of the rotating shaft 1, the first pole shoe 8 is in contact with the first magnetism isolating ring 6, and the second pole shoe 11 is in contact with the second magnetism isolating ring 12.
The magnetic fluid containment device 100 having a layer of porous media material further includes a first bearing 5 and a second bearing 16. The first bearing 5 is sleeved on the rotating shaft 1, and the outer peripheral surface of the first bearing 5 is in contact with the inner peripheral surface of the shell 2. The second bearing 16 is sleeved on the rotating shaft 1, and the outer peripheral surface of the second bearing 16 is in contact with the inner peripheral surface of the shell 2. Each of the first bearing 5 and the second bearing 16 is connected with the inner peripheral surface of the housing and the outer peripheral surface of the sleeve 101 by transition fit or clearance fit. The first bearing 5 and the second bearing 16 are arranged at intervals along the axial direction of the rotating shaft 1, and the first magnetism isolating ring 6 and the second magnetism isolating ring 12 are positioned between the first bearing 5 and the second bearing 16 in the axial direction of the rotating shaft 1.
The housing 2 includes a main body 201, a first end cover 202, and a second end cover 203, the main body 201 having a first end portion and a second end portion opposite in the axial direction of the rotation shaft 1. The first end cap 202 is connected to the first end portion of the main body 201 through a screw 13, an end surface of the first bearing 5 far away from the second bearing 16 contacts with the first end cap 202, a first stop surface 2021 is arranged on the first end cap 202, and the first bearing 5 is fixedly installed between the first stop surface 2021 and the first magnetism isolating ring 6. The second end cover 203 is connected to the second end portion of the housing 2 through a screw 13, an end surface of the second bearing 16 far away from the first bearing 5 contacts with the second end cover 203, a second stopping surface 2031 is arranged on the second end cover 203, and the second bearing 16 is fixedly installed between the second stopping surface 2031 and the second magnetism isolating ring 12. The first end of main part 201 has the flange 2011 that extends outward from the peripheral surface of main part 201, has connecting hole 2012 of interval arrangement on the flange 2011, is equipped with the third annular groove on the terminal surface of the second end of keeping away from main part 201 of flange 2011, is equipped with third sealing washer 4 in the third annular groove, conveniently has magnetic liquid sealing device 100 of porous medium material layer and treats sealing connection of sealing equipment. The end face, adjacent to the main body 201, of the second end cover 203 is provided with a fourth annular groove, a fourth sealing ring 14 is arranged in the fourth annular groove, and the fourth sealing ring 14 is attached to the end face of the second end of the main body 201, so that a gap between the second end cover 203 and the main body 201 is sealed conveniently. And the third sealing ring 4 and the fourth sealing ring 14 are O-shaped rings.
The permanent magnet 9 is made of neodymium iron boron materials, so that the permanent magnet 9 has excellent magnetism. The magnetic liquid 15 injected into the porous medium material layer 3 and the sealing gap between the porous medium material layer and the rotating shaft 1 is Fe3O4 nano-particles wrapping oleic acid and the magnetic liquid 15 with base carrier liquid being kerosene, and the magnetic liquid 15 is easy to prepare, low in cost and not easy to agglomerate. The shaft sleeve 101, the first pole shoe 8 and the second pole shoe 11 are made of low-carbon steel or martensitic stainless steel with carbon content lower than that of No. 10 steel, the low-carbon steel or martensitic stainless steel with carbon content lower than that of No. 10 steel has good magnetic conductivity, the carbon steel is low in cost, and the martensitic stainless steel is not easy to corrode. The first magnetism isolating ring 6, the second magnetism isolating ring 12, the first end cover 202, the second end cover 203, the shell and the screw 13 are made of 304 stainless steel which is non-magnetic, and the 304 stainless steel is not rusty and is cheap.
According to the magnetic liquid sealing device 100 with the porous medium material layer, the porous medium material layer 3 is arranged at the top end of the first tooth 801 and the top end of the second tooth 1101, so that the sealing gap between the first tooth 801 and the rotating shaft 1 and the sealing gap between the second tooth 1101 and the rotating shaft 1 can be reduced, the flow resistance in the magnetic fluid sealing gap is increased, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer is further enhanced. Meanwhile, the loss amount of the magnetic liquid 15 when the magnetic liquid 15 is broken in each stage of sealing in the magnetic liquid sealing device 100 with the porous medium material layer can be reduced, and the self-recovery capability of the magnetic liquid sealing is enhanced. Since the porous medium material layer 3 is only arranged at the top end of the first pole tooth 801 and the top end of the second pole tooth 1101, the performance of the first pole piece 8 and the second pole piece 11 for transmitting a magnetic circuit is not affected, so that a strong magnetic field intensity gradient can be formed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1, and further, the magnetic liquid 15 can be more firmly adsorbed in the sealing gap between the first pole tooth 801 and the rotating shaft 1 and the sealing gap between the second pole tooth 1101 and the rotating shaft 1 under the magnetic action force, and the sealing pressure resistance of the magnetic liquid sealing device 100 with the porous medium material layer can be enhanced.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
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| CN111442093A (en) * | 2020-05-12 | 2020-07-24 | 北京交通大学 | A Magnetic Liquid Sealing Device for Wide Temperature Applicability |
| CN112112975B (en) * | 2020-10-30 | 2022-06-14 | 清华大学 | Magnetic liquid sealing device |
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