CN111649136A - Magnetic powder sealing device for reciprocating shaft - Google Patents
Magnetic powder sealing device for reciprocating shaft Download PDFInfo
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- CN111649136A CN111649136A CN202010675332.5A CN202010675332A CN111649136A CN 111649136 A CN111649136 A CN 111649136A CN 202010675332 A CN202010675332 A CN 202010675332A CN 111649136 A CN111649136 A CN 111649136A
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- magnetic powder
- reciprocating shaft
- magnetic
- block
- pole shoe
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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
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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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
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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)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The invention discloses a magnetic powder sealing device for a reciprocating shaft, which comprises a shell, the reciprocating shaft, a first pole shoe, a second pole shoe, a permanent magnet and a first magnetic powder supplementing assembly, wherein a plurality of pole teeth are arranged on the inner circumferential wall of each pole shoe. The permanent magnet, the first pole shoe, the reciprocating shaft, the second pole shoe and the magnetic powder form a magnetic loop, and the magnetic powder is adsorbed at a sealing gap between the pole teeth and the reciprocating shaft as a sealing medium. The first pole shoe is provided with a first accommodating cavity, the first magnetic powder supplementing assembly comprises a first magnetic powder block, and the first magnetic powder block is arranged in the first accommodating cavity and can be in contact with and far away from the reciprocating shaft. According to the magnetic powder sealing device provided by the embodiment of the invention, after the magnetic powder is gradually brought away from the sealing gap and the sealing effect is reduced, the magnetic powder block is controlled to be in contact with the reciprocating shaft and generate the magnetic powder through friction, and the new magnetic powder is adsorbed at the sealing gap, so that the self-supplement of the magnetic powder is realized, the pressure resistance of the sealing device can be improved, and the leakage rate is reduced.
Description
Technical Field
The invention relates to the technical field of sealing, in particular to a magnetic powder sealing device for a reciprocating shaft.
Background
The magnetic powder sealing is a sealing form in which magnetic particles are used as main bodies and micro-nano magnetic powder (hereinafter referred to as "magnetic powder") formed by modifying the magnetic particles with a surfactant, a lubricant and the like is used as a sealing medium. Magnetic powder sealing is a high-performance novel sealing technology, and compared with a traditional sealing mode, the magnetic powder sealing device has the advantages of low leakage rate, strong pressure resistance, high reliability, extreme temperature resistance, capability of improving the pressure resistance in a specific environment through surface modification and the like.
However, in the magnetic powder sealing device in the related art, during the reciprocating motion of the reciprocating shaft, part of the magnetic powder is easily adhered to the reciprocating shaft, dragged and carried away from the sealing gap. The long-time reciprocating work, the magnetic powder adsorbed in the sealing gap is less and less, the pressure resistance of the sealing device is reduced, the leakage rate is increased, and even the sealing effect is completely lost.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a magnetic powder sealing device for a reciprocating shaft, which realizes the self-supplement of magnetic powder and improves the sealing effect of the sealing device.
The magnetic powder sealing device for the reciprocating shaft comprises a shell, the reciprocating shaft, a first pole shoe, a second pole shoe, a permanent magnet and a first magnetic powder supplementing assembly, wherein the reciprocating shaft penetrates through the shell and can reciprocate along the axial direction of the reciprocating shaft relative to the shell; the first pole shoe is arranged in the shell and sleeved on the outer side of the reciprocating shaft, a plurality of first pole teeth are arranged on the inner circumferential wall of the first pole shoe at intervals along the axial direction of the reciprocating shaft, magnetic powder for sealing is arranged between the tooth top surface of the first pole teeth and the outer circumferential surface of the reciprocating shaft, and the first pole shoe is provided with a first accommodating cavity; the second pole shoe is arranged in the shell and sleeved on the outer side of the reciprocating shaft, a plurality of second pole teeth are arranged on the inner circumferential wall of the second pole shoe and are arranged at intervals along the axial direction of the reciprocating shaft, and the magnetic powder is arranged between the tooth top surface of each second pole tooth and the outer circumferential surface of the reciprocating shaft; the permanent magnet is arranged in the shell and sleeved on the outer side of the reciprocating shaft, the permanent magnet is positioned between the first pole shoe and the second pole shoe, and the permanent magnet, the first pole shoe, the magnetic powder, the reciprocating shaft and the second pole shoe form a magnetic loop; first magnetic powder supplements the subassembly and includes first magnetic powder piece, first magnetic powder piece sets up first holding intracavity and can move between first position and second position first position, first magnetic powder piece with the outer peripheral face contact of reciprocating shaft with the reciprocating shaft friction produces the magnetic powder thereby replenish first utmost point tooth with the magnetic powder between the reciprocating shaft second position, first magnetic powder piece with the outer peripheral face separation of reciprocating shaft.
According to the magnetic powder sealing device for the reciprocating shaft, disclosed by the embodiment of the invention, the first magnetic powder block of the first magnetic powder supplementing assembly generates magnetic powder, the magnetic powder is supplemented to the sealing gap under the action of the magnetic field force, and the magnetic powder at the sealing gap is not required to be supplemented through the outside, so that the self-supplementing of the magnetic powder is realized, the sealing performance of the device can be recovered after the sealing effect is reduced, the pressure resistance of the sealing device is improved, and the leakage rate is reduced.
In some embodiments, the first magnetic powder supplement assembly further comprises a first operating member and a first magnetic isolating block, one end of the first operating member penetrates through the outer shell and the first pole piece to extend into the first accommodating cavity and is connected with the first magnetic powder block; the first magnetic isolation block is arranged between the first pole shoe and the first magnetic powder block, and the first operating part is connected with the first magnetic powder block through the first magnetic isolation block.
In some embodiments, the first operating member includes a first head and a first connecting rod, the first head being located outside the housing; one end of the first connecting rod is connected with the first end head, and the other end of the first connecting rod penetrates through the shell and the first pole shoe, extends into the first accommodating cavity and is connected with the first magnetic isolation block.
In some embodiments, the first connecting rod is movable relative to the housing and the first pole piece along a length direction of the first connecting rod, and the first operating member further includes a first return spring abutting between the first head and the housing and sleeved outside the first connecting rod.
In some embodiments, the first connecting rod is connected with the housing through a screw thread, the first magnetic isolation block is rotatably connected with the first connecting rod, a limiting groove extending along the length direction of the first connecting rod is formed in the inner wall surface of the first accommodating cavity, and the magnetic isolation block is movably matched in the limiting groove.
In some embodiments, the magnetic powder sealing device further comprises a first gasket, and the first gasket is arranged on one side of the first magnetic isolation block close to the first pole shoe and surrounds the first connecting rod.
In some embodiments, a surface treatment layer is arranged at a position of the reciprocating shaft opposite to the first magnetic powder block or the reciprocating shaft is made of wear-resistant materials.
In some embodiments, the second pole piece has a second receiving cavity, and the magnetic powder sealing device further includes a second magnetic powder replenishing assembly including a second magnetic powder block disposed in the second receiving cavity and movable between a first position in which the second magnetic powder block contacts the outer circumferential surface of the reciprocating shaft to rub against the reciprocating shaft to generate magnetic powder to replenish the magnetic powder between the second pole teeth and the reciprocating shaft, and a second position in which the second magnetic powder block is separated from the outer circumferential surface of the reciprocating shaft.
In some embodiments, the second magnetic powder supplement assembly further comprises a second operating member and a second magnetic isolating block, one end of the second operating member penetrates through the outer shell and the second pole piece to extend into the second accommodating cavity and is connected with the second magnetic powder block; the second operating component is connected with the second magnetic powder block through the second magnetism isolating block.
In some embodiments, the magnetic powder sealing device further includes a lip seal, the housing has a first through hole and a second through hole through which the reciprocating shaft passes, and an inner peripheral surface of each of the first through hole and the second through hole is provided with an annular groove in which the lip seal is fitted.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a sectional view of a magnetic powder sealing apparatus according to an embodiment of the present invention;
fig. 2 is a sectional view a-a of the magnetic powder sealing apparatus shown in fig. 1;
fig. 3 is a schematic view of a first magnetic powder block of a magnetic powder sealing apparatus according to an embodiment of the present invention in a first position;
fig. 4 is a sectional view of a magnetic powder sealing apparatus according to another embodiment of the present invention;
fig. 5 is a sectional view of a magnetic powder sealing apparatus according to still another embodiment of the present invention.
In the figure:
the dimensions of the housing 1, the end cap 11,
the reciprocating shaft (2) is provided with a reciprocating shaft,
the first pole shoe 3, the first tooth 31,
the second pole shoe 4, the second tooth 41,
the permanent magnets (5) are arranged in such a way that,
a first magnetic powder supplement assembly 6, a first magnetic powder block 61, a first magnetism isolating block 62, a first end 63, a first connecting rod 64, a first return spring 65, a first gasket 66,
a second magnetic powder supplement assembly 7, a second magnetic powder block 71, a second magnetic isolating block 72, a second end 73, a second connecting rod 74, a second return spring 75, a second gasket 76,
lip-shaped sealing ring 8.
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.
As shown in fig. 1 and 2, a magnetic particle sealing apparatus for a reciprocating shaft 2 according to an embodiment of the present invention includes a housing 1, a reciprocating shaft 2, a first pole piece 3, a second pole piece 4, a permanent magnet 5, and a first magnetic particle supplement assembly 6.
The reciprocating shaft 2 penetrates through the housing 1 and can reciprocate along an axial direction (a direction indicated by an arrow B in fig. 1) of the reciprocating shaft 2 relative to the housing 1. The first pole shoe 3 is arranged in the shell 1 and sleeved on the outer side of the reciprocating shaft 2, a plurality of first pole teeth 31 are arranged on the inner circumferential wall of the first pole shoe 3, the first pole teeth 31 are arranged along the reciprocating shaft 2 at intervals in the axial direction, magnetic powder for sealing is arranged between the tooth top surface of the first pole teeth 31 and the outer circumferential surface of the reciprocating shaft 2, and the first pole shoe 3 is provided with a first accommodating cavity. The second pole shoe 4 is arranged in the shell 1 and sleeved on the outer side of the reciprocating shaft 2, a plurality of second pole teeth 41 are arranged on the inner circumferential wall of the second pole shoe 4, the second pole teeth 41 are arranged at intervals along the axial direction of the reciprocating shaft 2, and magnetic powder is also arranged between the tooth crest of each second pole tooth 41 and the outer circumferential surface of the reciprocating shaft 2.
The permanent magnet 5 is arranged in the shell 1 and sleeved on the outer side of the reciprocating shaft 2, the permanent magnet 5 is located between the first pole shoe 3 and the second pole shoe 4, and the permanent magnet 5, the first pole shoe 3, the magnetic powder, the reciprocating shaft 2 and the second pole shoe 4 form a magnetic loop. It should be noted that the first pole shoe 3, the reciprocating shaft 2 and the second pole shoe 4 are made of a magnetic conductive material, the housing 1 is made of a non-magnetic conductive material, and magnetic powder is adsorbed on tooth tops of the first pole tooth 31 and the second pole tooth 41 under the action of a magnetic field and contacts with the reciprocating shaft 2 to achieve sealing, and hereinafter, for convenience of description, gaps between the reciprocating shaft 2 and the first pole tooth 31 and the second pole tooth 41 are referred to as sealing gaps.
The first magnetic powder supplementing assembly 6 comprises a first magnetic powder block 61, the first magnetic powder block 61 is arranged in a first containing cavity of the first pole shoe 3 and can move between a first position and a second position, the first magnetic powder block 61 is in contact with the outer peripheral surface of the reciprocating shaft 2 to rub with the reciprocating shaft 2 to generate magnetic powder at the first position, and the magnetic induction lines at the sealing gap are the densest, so that the magnetic powder generated by rubbing flows to the first pole tooth 31 from the first magnetic powder block 61 under the action of a magnetic field force and is adsorbed by the first pole tooth 31 to supplement the magnetic powder at the sealing gap, and the first magnetic powder block 61 is separated from the outer peripheral surface of the reciprocating shaft 2 at the second position and does not generate the magnetic powder any more.
The magnetic powder is SmCo with an average particle size of 30nm5Powder and oleic acid-coated Fe with an average particle size of 100 μm3O4The particles are mixed according to the mass ratio of 2:1, molybdenum disulfide is added, and the mixture is prepared into powder, and the first magnetic powder block 61 is a block solid prepared by pressing the magnetic powder and resin.
According to the magnetic powder sealing device provided by the embodiment of the invention, the first magnetic powder supplementing assembly 6 is arranged, magnetic powder is generated through the first magnetic powder block 61 of the first magnetic powder supplementing assembly 6, the magnetic powder is supplemented to the sealing gap under the action of a magnetic field force, and the magnetic powder at the sealing gap is not required to be supplemented through the outside, so that the self-supplementing of the magnetic powder in the device is realized, the sealing performance of the device can be recovered after the sealing effect is reduced, the pressure resistance of the sealing device is improved, and the leakage rate is reduced.
According to the embodiment of the invention, the first magnetic powder replenishing assembly 6 further comprises a first operating part and a first magnetic isolating block 62, one end of the first operating part penetrates through the shell 1 and the first pole shoe 3 and extends into the first accommodating cavity and is connected with the first magnetic powder block 61, so that a user can control the first magnetic powder block 61 to be close to or far from the reciprocating shaft 2 through the first operating part, and the pressure applied to the magnetic powder block by the first operating part can be controlled, so that the pressure between the magnetic powder block and the reciprocating shaft 2 is controlled, the quantity of the generated magnetic powder in unit time is further controlled, and the user can flexibly replenish the magnetic powder according to the loss degree of the magnetic powder and the sealing performance of the sealing device.
In order to avoid the mutual influence of the magnetic properties of the magnetic powder block and other parts, a first magnetic isolating block 62 is arranged between the first pole piece 3 and the first magnetic powder block 61, the first magnetic isolating block 62 is made of a non-magnetic conductive material, such as demagnetized 304 stainless steel or aluminum alloy material, the first operating component is connected with the first magnetic powder block 61 through the first magnetic isolating block 62, in this embodiment, the first magnetic isolating block 62 and the first magnetic powder block 61 are connected together by an adhesive, and certainly, the invention is not limited thereto, and other ways can be used as long as the effect of stable connection can be achieved.
In some embodiments, the first operating member includes a first end 63, a first connecting rod 64, the first end 63 is located at the outer side of the casing 1, one end of the first connecting rod 64 is connected to the first end 63, and the other end of the first connecting rod 64 penetrates through the casing 1 and the first pole piece 3 to extend into the first accommodating cavity and is connected to the first magnetic isolating block 62. So configured, the user can control the first connection rod 64 through the first end 63, and easily apply pressure to the connection rod, thereby more precisely controlling the supplement amount of magnetic powder,
further, as shown in fig. 1, the first operating member further comprises a first return spring 65, the first connecting rod 64 is movable relative to the housing 1 and the first pole piece 3 along the length direction of the first connecting rod 64, and the first return spring 65 abuts between the first end 63 and the housing 1 and is sleeved outside the connecting rod. In other words, one end of the first return spring 65 abuts against the side of the first end 63 close to the housing 1, and the other end of the first return spring 65 abuts against the housing 1.
So set up, the user accessible is pressed first end 63 and is applyed pressure to head rod 64, and is simple direct to after the magnetic powder is replenished, automatic re-setting under first reset spring 65's effect of first operating means, reciprocating shaft 2 is kept away from to first magnetic powder piece 61, convenient operation, in addition, first reset spring 65 can also continuously exert the holding power for first end 63, has guaranteed under the natural state, and first magnetic powder piece 61 does not take place the contact with reciprocating shaft 2.
As shown in fig. 4, in other embodiments, the first connecting rod 64 is connected to the housing 1 through a screw, the first magnetic isolating block 62 is rotatably connected to the first connecting rod 64, a position-limiting groove extending along the length direction of the first connecting rod 64 is formed in an inner wall surface of the first receiving cavity, and the first magnetic isolating block 62 is movably fitted in the position-limiting groove. In other words, the first magnetic isolating block 62 can rotate relative to the first connecting rod 64, and the first magnetic isolating block 62 can only move relative to the position-limiting groove along the extending direction thereof and cannot rotate relative to the position-limiting groove. The periphery of the first connecting rod 64 is provided with external threads, the shell 1 is provided with a threaded hole, and the first connecting rod 64 is matched in the threaded hole on the shell 1. In this embodiment, the first magnetism isolating block 62 is connected to the first connecting rod 64 through a pin shaft, the pin shaft is coaxially arranged with the first connecting rod 64, and a sufficient gap is left, so that the magnetism isolating block can normally rotate.
It should be noted that, in order to facilitate the installation of the first magnetic isolating block 62 in the limiting groove, as shown in fig. 4, the first pole shoe 3 is a split structure and is divided into a first left half pole shoe and a first right half pole shoe, when in installation, the first magnetic isolating block 62 is connected with the first magnetic powder block 61, then the first left half pole shoe is placed in the housing 1, the first magnetic isolating block 62 is connected with the first connecting rod 64, and finally the first right half pole shoe is installed.
Therefore, a user can rotate the first connecting rod 64 or the first end 63 along the direction indicated by the arrow D in fig. 4, so that the first connecting rod 64 moves along the length direction of the threaded hole and drives the first magnetism isolating block 62 to move along the extending direction of the limiting groove, the first magnetism isolating block 62 drives the first magnetic powder block 61 to move and finally contact with the reciprocating shaft 2, and magnetic powder is generated through friction. This way, the force is not needed to be continuously applied to the end or the connecting rod, and the first magnetic powder block 61 can be provided with larger pressure, and the magnetic powder can be replenished more quickly.
In some embodiments, the first magnetic powder supplement assembly 6 further comprises a first spacer 66, the first spacer 66 is disposed on one side of the first magnetic isolating block 62 close to the first pole piece 3 and surrounds the first connecting rod 64. It can be understood that the first gasket 66 is disposed between the first magnetism isolating block 62 and the inner peripheral wall of the housing 1, and is sleeved on the outer side of the first connecting rod 64, the first gasket 66 plays a role in sealing to prevent the first accommodating cavity from being communicated with the outside through the first pole shoe 3, the gap between the housing 1 and the first connecting rod 64, which leads to sealing failure, in addition, in some other embodiments, an annular groove is disposed on the outer peripheral wall of the first pole shoe 3, an O-ring is disposed in the annular groove, and the O-ring is used to prevent the sealed cavity from being communicated with the outside through the gap between the first pole shoe 3 and the housing 1.
As shown in fig. 1, in some embodiments, the magnetic powder sealing apparatus further comprises a second magnetic powder supplement assembly 7, the second magnetic powder supplement assembly 7 having substantially the same structure as the first magnetic powder supplement assembly 6 except for a relative position within the housing 1, the first magnetic powder supplement assembly 6 corresponding to the first pole piece 3 for supplementing magnetic powder at the first pole tooth 31, and the second magnetic powder supplement assembly 7 corresponding to the second pole piece 4 for supplementing magnetic powder at the second pole tooth 41.
Specifically, the second magnetic powder replenishing assembly includes a second magnetic powder block 71, a second operating member and a second magnetic isolating block 72, the second pole piece 4 has a second accommodating cavity, the second magnetic powder block 71 is disposed in the second accommodating cavity and is movable between a first position and a second position, in the first position, the second magnetic powder block 71 is in contact with the outer circumferential surface of the reciprocating shaft 2 to generate magnetic powder by friction with the reciprocating shaft 2 so as to replenish the magnetic powder between the second pole tooth 41 and the reciprocating shaft 2, and in the second position, the second magnetic powder block 71 is separated from the outer circumferential surface of the reciprocating shaft 2.
It should be noted that the second magnetic powder supplement assembly 7 also has a second shim 76 corresponding to the first shim 66, and the second shim 76 is disposed on a side of the second magnetic isolating block 72 close to the second pole piece 4 and surrounds the second connecting rod 74, so as to prevent the second accommodating cavity from communicating with the outside through a gap between the second pole piece 4, the housing 1 and the second connecting rod 74. Similarly, an annular groove is formed in the outer peripheral wall of the second pole piece 4, an O-shaped ring is arranged in the annular groove, and the O-shaped ring is used for preventing the sealed cavity from being communicated with the outside through a gap between the second pole piece 4 and the shell 1.
In some embodiments, the reciprocating shaft 2 is provided with a surface treatment layer or made of an abrasion resistant material at a position opposite to the first magnetic powder block 61 and the second magnetic powder block 71, and it is understood that at least a part of the surface of the reciprocating shaft 2 is the abrasion resistant material or the surface treatment layer is generated by the surface treatment, at least a part of which refers to a part capable of contacting with the magnetic powder blocks, so as to increase the hardness and abrasion resistance of the reciprocating shaft 2.
In order to achieve the above effects, the reciprocating shaft 2 may be formed by combining a plurality of shaft sections, or may be of an integrated structure, as shown in fig. 1, the reciprocating shaft 2 includes a left section, a first wear-resistant section, a middle section, a second wear-resistant section and a right section which are connected in sequence, wherein the first wear-resistant section and the second wear-resistant section are machined by 45 steel, and the left section, the middle section and the right section are machined by Q235 steel and are connected with each other by threads, so that the material cost can be reduced; as shown in fig. 5, the reciprocating shaft 2 has an integral structure, and can be processed by a surface treatment method such as carburizing, nitriding, chrome plating, surface quenching, shot peening, etc., thereby saving costs.
In some embodiments, the magnetic powder sealing device further includes a lip seal 8, and the housing 1 has a first through hole and a second through hole through which the reciprocating shaft 2 passes, and the inner peripheral surfaces of the first through hole and the second through hole are each provided with an annular groove in which the lip seal 8 is fitted. Therefore, the magnetic powder separated from the sealing gap is more difficult to leave the shell 1 by the combined sealing mode formed by magnetic powder sealing and lip sealing, so that the magnetic powder is more difficult to pollute the external working environment, and the sealing is more reliable.
It should be noted that, according to the magnetic powder sealing device of the embodiment of the present invention, the structure of the housing 1 may be an integral structure, but for the convenience of assembly, the housing 1 may also be a separate structure, or the housing 1 is opened and provided with the end cap 11.
A magnetic powder sealing device for a reciprocating shaft 2 according to some specific examples of the present invention is described below with reference to fig. 1 to 3.
As shown in fig. 1 and 2, a magnetic particle sealing apparatus for a reciprocating shaft 2 according to an embodiment of the present invention includes a housing 1, a reciprocating shaft 2, a first pole piece 3, a second pole piece 4, a permanent magnet 5, a first magnetic particle supplement assembly 6, and a second magnetic particle supplement assembly 7.
The right end of the shell 1 is opened, an end cover 11 is arranged at the opening, a first through hole is arranged at the left end of the shell 1, a second through hole is arranged at the end cover 11, the reciprocating shaft 2 penetrates through the first through hole and the second through hole, annular grooves are formed in the inner circumferential surfaces of the first through hole and the second through hole, the lip-shaped sealing ring 8 is matched in the annular groove, the first pole shoe 3 and the second pole shoe 4 are sleeved on the outer side of the reciprocating shaft 2 and are positioned in the shell 1, the outer circumferential wall of the first pole shoe 3 is abutted against the inner circumferential wall of the shell 1, the outer circumferential wall of the second pole shoe 4 is abutted against the inner circumferential wall of the shell 1, a permanent magnet 5 is arranged between the first pole shoe 3 and the second pole shoe 4, the permanent magnet 5 is not contacted with the shell 1, the permanent magnet 5, the first pole shoe 3, magnetic powder, the reciprocating shaft 2 and the second pole shoe 4 form a magnetic loop and generate a stable magnetic field, the first pole shoe 3 is provided with a plurality, the first pole tooth 31 and the second pole tooth 41 are adsorbed with magnetic powder under the action of magnetic field force, and the magnetic powder is filled in the sealing gap to play a role of sealing.
The first pole shoe 3 is provided with a first accommodating cavity, a first magnetic powder supplementing assembly 6 is arranged in the first accommodating cavity, the second pole shoe 4 is provided with a second accommodating cavity, and a second magnetic powder supplementing assembly 7 is arranged in the second accommodating cavity.
The first magnetic powder supplementing assembly 6 comprises a first magnetic powder block 61, a first magnetic isolating block 62 and a first operating component, wherein the first magnetic powder block 61 and the first magnetic isolating block 62 are arranged in the first accommodating cavity, the first operating component penetrates through the shell 1 to be connected with the first magnetic isolating block 62, and the first magnetic isolating block 62 is connected with the first magnetic powder block 61. The second magnetic powder supplementing assembly 7 comprises a second magnetic powder block 71, a second magnetic isolating block 72 and a second operating component, the second magnetic powder block 71 and the second magnetic isolating block 72 are arranged in the second accommodating cavity, the second operating component penetrates through the shell 1 to be connected with the second magnetic isolating block 72, and the second magnetic isolating block 72 is connected with the second magnetic powder block 71.
The first operating part comprises a first end 63, a first connecting rod 64 and a first return spring 65, the first end 63 is connected with one end of the first connecting rod 64, the other end of the first connecting rod 64 penetrates through the shell 1 and the first pole shoe 3 to be connected with the first magnetic isolating block 62, the first connecting rod 64 can move along the length direction of the first connecting rod, the first return spring 65 is abutted between the first end 63 and the shell 1 and sleeved on the first connecting rod 64, a first gasket 66 is arranged on one side, close to the first pole shoe 3, of the first magnetic isolating block 62, and the first gasket 66 is sleeved on the peripheral side of the first connecting rod 64. The second operating part comprises a second end 73, a second connecting rod 74 and a second return spring 75, the second end 73 is connected with one end of the second connecting rod 74, the other end of the second connecting rod 74 penetrates through the shell 1 and the second pole shoe 4 to be connected with the second magnetic isolating block 72, the second connecting rod 74 can move along the length direction of the second connecting rod, the second return spring 75 abuts between the second end 73 and the shell 1 and is sleeved on the second connecting rod 74, a second gasket 76 is arranged on one side, close to the second pole shoe 4, of the second magnetic isolating block 72, and the second gasket 76 is sleeved on the peripheral side of the second connecting rod 74.
The reciprocating shaft 2 comprises a left section, a first wear-resistant section, a middle section, a second wear-resistant section and a right section which are sequentially connected, wherein the first wear-resistant section and the second wear-resistant section are formed by machining 45 steel, the left section, the middle section and the right section are formed by machining Q235 steel, and the two adjacent sections are connected through threads.
As shown in fig. 2 and 3 (the direction indicated by the arrow C in fig. 3 is a force application direction), when magnetic powder at the sealing gap corresponding to the first pole tooth 31 needs to be supplemented, only the first end 63 needs to be pressed, the first connecting rod 64 moves from the second position to the first position along with the first end, the first magnetic powder block 61 contacts with the first wear-resistant section, the reciprocating shaft 2 rubs against the first magnetic powder block 61 in the reciprocating process, the first magnetic powder block 61 generates magnetic powder, the magnetic powder flows to the sealing gap of the first pole tooth 31 under the action of a magnetic field force, and the self-supplementing of the magnetic powder is completed, at this time, the user loosens the first end 63, the first operating component resets to the second position under the action of the first return spring 65, and the first magnetic powder block 61 is separated from the reciprocating shaft 2 and does not generate magnetic powder any more.
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 (10)
1. A magnetic powder sealing device for a reciprocating shaft, comprising:
a housing;
a reciprocating shaft penetrating the housing and reciprocally movable relative to the housing in an axial direction of the reciprocating shaft;
the first pole shoe is arranged in the shell and sleeved on the outer side of the reciprocating shaft, a plurality of first pole teeth are arranged on the inner circumferential wall of the first pole shoe and are arranged at intervals along the axial direction of the reciprocating shaft, magnetic powder for sealing is arranged between the tooth top surface of the first pole teeth and the outer circumferential surface of the reciprocating shaft, and the first pole shoe is provided with a first accommodating cavity;
the second pole shoe is arranged in the shell and sleeved on the outer side of the reciprocating shaft, a plurality of second pole teeth are arranged on the inner circumferential wall of the second pole shoe and are arranged at intervals along the axial direction of the reciprocating shaft, and the magnetic powder is arranged between the tooth top surface of each second pole tooth and the outer circumferential surface of the reciprocating shaft;
the permanent magnet is arranged in the shell and sleeved on the outer side of the reciprocating shaft, the permanent magnet is positioned between the first pole shoe and the second pole shoe, and the permanent magnet, the first pole shoe, the magnetic powder, the reciprocating shaft and the second pole shoe form a magnetic loop;
first magnetic powder supplements the subassembly, first magnetic powder supplements the subassembly including first magnetic powder piece, first magnetic powder piece sets up first holding intracavity and can move between first position and second position first position, first magnetic powder piece with the outer peripheral face contact of reciprocating shaft with thereby produce the magnetic powder with the reciprocating shaft friction and supply first utmost point tooth with the magnetic powder between the reciprocating shaft second position, first magnetic powder piece with the outer peripheral face separation of reciprocating shaft.
2. The magnetic particle seal apparatus for a reciprocating shaft of claim 1, wherein the first magnetic particle replenishment assembly further comprises:
one end of the first operating member penetrates through the outer shell and the first pole shoe, extends into the first accommodating cavity and is connected with the first magnetic powder block;
the first magnetic isolating block is arranged between the first pole shoe and the first magnetic powder block, and the first operating part is connected with the first magnetic powder block through the first magnetic isolating block.
3. The magnetic powder sealing device for a reciprocating shaft according to claim 2, wherein the first operating member includes:
a first end located outside the housing;
one end of the first connecting rod is connected with the first end head, and the other end of the first connecting rod penetrates through the shell and the first pole shoe to extend into the first accommodating cavity and is connected with the first magnetic isolation block.
4. The magnetic powder seal for a reciprocating shaft of claim 3, wherein the first connecting rod is movable relative to the housing and the first pole piece in a length direction of the first connecting rod,
the first operating part further comprises a first return spring, and the first return spring is abutted between the first end and the shell and sleeved on the outer side of the first connecting rod.
5. The magnetic powder sealing device for the reciprocating shaft according to claim 3, wherein the first connecting rod is connected with the housing through a thread, the first magnetic isolating block is rotatably connected with the first connecting rod, a limiting groove extending along the length direction of the first connecting rod is formed in the inner wall surface of the first accommodating cavity, and the magnetic isolating block is movably fitted in the limiting groove.
6. A magnetic powder sealing device for a reciprocating shaft according to any one of claims 3 to 5, further comprising a first gasket provided on a side of the first magnetic shielding block adjacent to the first pole piece and surrounding the first connecting rod.
7. A magnetic powder sealing device for a reciprocating shaft according to any one of claims 1 to 5, wherein a surface treatment layer is provided or made of a wear-resistant material at a position of the reciprocating shaft opposite to the first magnetic powder block.
8. A magnetic powder seal for a reciprocating shaft according to any one of claims 1 to 5, wherein the second pole piece has a second receiving cavity, the magnetic powder seal further comprising a second magnetic powder replenishment assembly comprising a second magnetic powder block disposed within the second receiving cavity and movable between a first position in which the second magnetic powder block contacts the outer circumferential surface of the reciprocating shaft to rub against the reciprocating shaft to produce magnetic powder to replenish the magnetic powder between the second pole teeth and the reciprocating shaft, and a second position in which the second magnetic powder block is spaced from the outer circumferential surface of the reciprocating shaft.
9. The magnetic powder seal apparatus for a reciprocating shaft of claim 8, wherein the second magnetic powder supplement assembly further comprises:
one end of the second operating component penetrates through the outer shell and the second pole shoe, extends into the second accommodating cavity and is connected with the second magnetic powder block;
and the second operating component is connected with the second magnetic powder block through the second magnetic isolating block.
10. The magnetic powder seal device for a reciprocating shaft according to any one of claims 1 to 5, further comprising a lip seal, wherein the housing has a first through hole and a second through hole through which the reciprocating shaft passes, and inner peripheral surfaces of the first through hole and the second through hole are each provided with an annular groove, and the lip seal is fitted in the annular groove.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675332.5A CN111649136B (en) | 2020-07-14 | 2020-07-14 | Magnetic powder sealing device for reciprocating shaft |
| JP2021021540A JP6906266B2 (en) | 2020-07-14 | 2021-02-15 | Magnetic particle sealing device used for reciprocating shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675332.5A CN111649136B (en) | 2020-07-14 | 2020-07-14 | Magnetic powder sealing device for reciprocating shaft |
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| Publication Number | Publication Date |
|---|---|
| CN111649136A true CN111649136A (en) | 2020-09-11 |
| CN111649136B CN111649136B (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010675332.5A Active CN111649136B (en) | 2020-07-14 | 2020-07-14 | Magnetic powder sealing device for reciprocating shaft |
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| Country | Link |
|---|---|
| JP (1) | JP6906266B2 (en) |
| CN (1) | CN111649136B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392963A (en) * | 2020-11-11 | 2021-02-23 | 清华大学 | Magnetic liquid sealing device |
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| JPS62177367A (en) * | 1986-01-30 | 1987-08-04 | Tech Res Assoc Highly Reliab Marine Propul Plant | Magnetic fluid shaft seal device for liquid |
| US5806856A (en) * | 1992-08-27 | 1998-09-15 | Ferrofluidics Corporation | On-site fillable liquid magnetic seal |
| RU2286496C2 (en) * | 2004-04-29 | 2006-10-27 | Государственное образовательное учреждение высшего профессионального образования "Ивановский государственный энергетический университет им. В.И. Ленина" | Method of charging magneto-fluid shaft seal |
| CN209705275U (en) * | 2019-03-01 | 2019-11-29 | 无锡全世全流体科技有限公司 | It is a kind of for rotating and moving back and forth the magnetic fluid seal device of equipment |
| CN110848391A (en) * | 2019-11-18 | 2020-02-28 | 西华大学 | Gas-liquid mixed type magnetic fluid sealing device |
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2020
- 2020-07-14 CN CN202010675332.5A patent/CN111649136B/en active Active
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- 2021-02-15 JP JP2021021540A patent/JP6906266B2/en active Active
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| JPS62177367A (en) * | 1986-01-30 | 1987-08-04 | Tech Res Assoc Highly Reliab Marine Propul Plant | Magnetic fluid shaft seal device for liquid |
| US5806856A (en) * | 1992-08-27 | 1998-09-15 | Ferrofluidics Corporation | On-site fillable liquid magnetic seal |
| RU2286496C2 (en) * | 2004-04-29 | 2006-10-27 | Государственное образовательное учреждение высшего профессионального образования "Ивановский государственный энергетический университет им. В.И. Ленина" | Method of charging magneto-fluid shaft seal |
| CN209705275U (en) * | 2019-03-01 | 2019-11-29 | 无锡全世全流体科技有限公司 | It is a kind of for rotating and moving back and forth the magnetic fluid seal device of equipment |
| CN110848391A (en) * | 2019-11-18 | 2020-02-28 | 西华大学 | Gas-liquid mixed type magnetic fluid sealing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112392963A (en) * | 2020-11-11 | 2021-02-23 | 清华大学 | Magnetic liquid sealing device |
| CN112392963B (en) * | 2020-11-11 | 2021-07-20 | 清华大学 | Magnetic liquid sealing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021099163A (en) | 2021-07-01 |
| JP6906266B2 (en) | 2021-07-21 |
| CN111649136B (en) | 2020-12-18 |
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