CN112145698A - Magnetic liquid sealing device with permanent magnet sheets and magnetic conductive sheets alternately distributed - Google Patents
Magnetic liquid sealing device with permanent magnet sheets and magnetic conductive sheets alternately distributed Download PDFInfo
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- CN112145698A CN112145698A CN202010862984.XA CN202010862984A CN112145698A CN 112145698 A CN112145698 A CN 112145698A CN 202010862984 A CN202010862984 A CN 202010862984A CN 112145698 A CN112145698 A CN 112145698A
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- magnetic
- permanent magnet
- rotating shaft
- pieces
- sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
Abstract
The invention discloses a magnetic liquid sealing device with alternately distributed permanent magnet pieces and magnetic conductive pieces, which comprises a shell, a rotating shaft and a sealing assembly, wherein the rotating shaft penetrates through the shell and can rotate relative to the shell, the sealing assembly comprises permanent magnet pieces and magnetic conductive pieces, the magnetic conductive pieces and the permanent magnet pieces are arranged in the shell and sleeved on the outer side of the rotating shaft, the magnetic conductive pieces and the permanent magnet pieces are alternately arranged along the axial direction of the rotating shaft, the adjacent magnetic conductive pieces and the permanent magnet pieces are tightly attached, a sealing gap is formed between the inner peripheral surface of each magnetic conductive piece and the outer peripheral surface of the rotating shaft in the radial direction of the rotating shaft, and magnetic liquid is contained in the sealing gap. According to the magnetic liquid sealing device provided by the embodiment of the invention, the magnetic field is uniformly distributed, the adsorption capacity to the magnetic liquid is stronger, a higher sealing stage number can be set, the processing and maintenance cost is low, the situation that the magnetic liquid is far away from a sealing gap is avoided, and the sealing performance is more reliable.
Description
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device with alternately distributed permanent magnet sheets and magnetic conductive sheets.
Background
The magnetic liquid seal is a novel non-contact seal, utilizes the characteristics that magnetic liquid has mobility and magnetic field responsiveness simultaneously, through forming magnetic field gradient in the sealed clearance, makes magnetic liquid form a plurality of "O type" liquid seal circle in sealed clearance under the combined action of pressure and magnetic field force, realizes sealed withstand voltage effect, has "zero leakage", long-life, the advantage of high reliability.
In the related art, the magnetic liquid sealing device includes a left pole shoe, a right pole shoe and a permanent magnet disposed therebetween, the pole shoes are grooved to form pole teeth, and the magnetic liquid is adsorbed on the pole teeth to form a seal. When the pressure resistance requirement is high and the sealing stages are increased, the number of the pole teeth needs to be increased, but the increase of the number of the pole teeth can cause uneven distribution of the magnetic liquid among the pole teeth, and the use efficiency of the magnetic liquid and the permanent magnet is reduced; in addition, in the large-diameter high-speed sealing field, the magnetic liquid climbs along the pole teeth under the action of a larger centrifugal force and gradually gets away from the sealing gap, so that the volume of the magnetic liquid in the sealing gap is reduced, and even a gap is formed between the pole teeth and the shaft, so that the total pressure resistance of the sealing device is reduced.
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 liquid sealing device with alternately distributed permanent magnet pieces and magnetic conductive pieces, wherein the magnetic liquid of the magnetic liquid sealing device is uniformly distributed in a sealing gap, and the situation that the magnetic liquid is far away from the sealing gap is avoided.
The magnetic liquid sealing device comprises a shell, a rotating shaft and a sealing assembly, wherein the rotating shaft penetrates through the shell and can rotate relative to the shell, the sealing assembly comprises permanent magnet pieces and magnetic conducting pieces, the magnetic conducting pieces and the permanent magnet pieces are arranged in the shell and sleeved on the outer side of the rotating shaft, the magnetic conducting pieces and the permanent magnet pieces are alternately arranged along the axial direction of the rotating shaft, the magnetic conducting pieces are arranged on two sides of the permanent magnet pieces which are oppositely arranged in the axial direction of the rotating shaft, the adjacent magnetic conducting pieces and the permanent magnet pieces are tightly attached, a sealing gap is formed between the inner circumferential surface of each magnetic conducting piece and the outer circumferential surface of the rotating shaft in the radial direction of the rotating shaft, magnetic liquid for sealing is arranged in the sealing gap, and the two adjacent magnetic conducting pieces, the permanent magnet pieces between the two adjacent magnetic conducting pieces, the permanent magnet pieces, The rotating shaft and the magnetic liquid form a magnetic circuit.
According to the magnetic liquid sealing device with the permanent magnet pieces and the magnetic conductive pieces alternately distributed, the magnetic field is uniformly distributed, the adsorption capacity to the magnetic liquid is higher, and the magnetic liquid is uniformly distributed in the sealing gap and can be provided with higher sealing stages according to the pressure-resistant requirement. In addition, because the invention adopts the way of alternately arranging the magnetic conductive sheets and the permanent magnet sheets, compared with the pole shoe and pole tooth structure in the prior art, the invention has the advantages of low processing cost, avoiding the occurrence of the situation that the magnetic liquid is far away from the sealing gap and more reliable sealing performance.
In some embodiments, the inner peripheral surface of the permanent magnet piece and the outer peripheral surface of the rotating shaft have a gap in a radial direction of the rotating shaft.
In some embodiments, the permanent magnet piece and the magnetic conductive piece are both ring-shaped, and the inner diameter of the permanent magnet piece is the same as the inner diameter of the magnetic conductive piece.
In some embodiments, the dimension of the magnetic conductive sheet in the axial direction of the rotating shaft is 0.25-0.35mm, and the dimension of the permanent magnet sheet in the axial direction of the rotating shaft is 0.6-3 mm.
In some embodiments, the magnetic liquid sealing device with the permanent magnet pieces and the magnetic conductive pieces alternately distributed further includes a first magnetism isolating ring and a second magnetism isolating ring, the first magnetism isolating ring and the second magnetism isolating ring are both disposed on the housing and sleeved outside the rotating shaft, the first magnetism isolating ring is disposed at the first end of the sealing assembly, and the second magnetism isolating ring is disposed at the second end of the sealing assembly.
In some embodiments, the magnetic liquid sealing device with the permanent magnet pieces and the magnetic conductive pieces alternately distributed further includes a first bearing and a second bearing, the first bearing and the second bearing are both disposed in the housing and are matched with the rotating shaft, the first bearing is disposed on one side of the first magnetism isolating ring away from the sealing assembly, and the second bearing is disposed on one side of the second magnetism isolating ring away from the sealing assembly.
In some embodiments, the housing includes a barrel having a cavity, a first end of the barrel being open to open the first end of the cavity, and an end cap disposed at the first end of the barrel to close the first end of the cavity, the shaft extending through the end cap.
In some embodiments, the rotating shaft is provided with a first retaining ring and a second retaining ring, the first retaining ring and the second retaining ring are both disposed around the rotating shaft, the first retaining ring is located between the first bearing and the first end of the housing, and the second retaining ring is located between the second bearing and the second end of the housing.
In some embodiments, the material of the magnetic conductive sheet is silicon steel.
In some embodiments, the material of the first magnetism isolating ring, the material of the second magnetism isolating ring and the material of the shell are all non-magnetic materials.
Drawings
Fig. 1 is a schematic view of a magnetic fluid sealing device with permanent magnet pieces and magnetic conductive pieces alternately distributed according to an embodiment of the invention;
fig. 2 is a partially enlarged view a of the magnetic liquid sealing apparatus in which permanent magnet pieces and magnetic conductive pieces are alternately arranged according to the embodiment of the present invention.
Reference numerals:
the magnetic bearing comprises a shell 1, a cylindrical part 11, an end cover 12, a flange 13, a sealing ring 14, a rotating shaft 2, a first retaining ring 21, a second retaining ring 22, a sealing assembly 3, a permanent magnet piece 31, a magnetic conducting piece 32, a first magnetism isolating ring 4, a second magnetism isolating ring 5, a first bearing 6, a second bearing 7 and magnetic liquid 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, the magnetic liquid 8 sealing apparatus according to the embodiment of the present invention includes a housing 1, a rotation shaft 2, and a seal assembly 3. The rotating shaft 2 penetrates through the housing 1 and is rotatable relative to the housing 1. As shown in fig. 1, the rotating shaft 2 extends in the left-right direction, that is, the axial direction of the rotating shaft 2 is the left-right direction, and the rotating shaft 2 penetrates the housing 1 in the left-right direction. Specifically, the material of the rotating shaft 2 is a magnetic conductive material, and the material of the housing 1 is a non-magnetic conductive material.
The sealing assembly 3 is arranged in the shell 1 to play a sealing role.
As shown in fig. 2, specifically, the sealing assembly 3 includes a magnetic conducting plate 32 and a permanent magnet plate 31, and both the magnetic conducting plate 32 and the permanent magnet plate 31 are sleeved outside the rotating shaft 2. The magnetic conductive pieces 32 and the permanent magnet pieces 31 are alternately arranged along the axial direction of the rotating shaft 2, and the magnetic conductive pieces 32 are arranged on two sides of the permanent magnet pieces 31 which are oppositely arranged in the axial direction of the rotating shaft 2. In other words, both sides of each permanent magnet piece 31 are provided with the magnetic conducting pieces 32, the number of the permanent magnet pieces 31 is at least one, and the number of the magnetic conducting pieces 32 is one more than that of the permanent magnet pieces 31.
Further, the adjacent magnetic conductive sheets 32 and the permanent magnet sheets 31 are tightly attached to each other, that is, no gap exists between the magnetic conductive sheets 32 and the permanent magnet sheets 31. Specifically, the magnetic conductive sheet 32 and the permanent magnet sheet 31 may be adhered together by an adhesive, or pressure may be applied to both sides of the magnetic conductive sheet to make the magnetic conductive sheet and the permanent magnet sheet 31 closely adhere to each other.
As shown in fig. 2, a sealing gap is formed between the inner circumferential surface of the magnetic conductive sheet 32 and the outer circumferential surface of the rotating shaft 2 in the radial direction of the rotating shaft 2, the distance between the inner circumferential surface of the magnetic conductive sheet 32 and the outer circumferential surface of the rotating shaft 2 in the radial direction of the rotating shaft 2 is 0.001mm to 1mm, a magnetic liquid 8 for sealing is arranged in the sealing gap, the type of the magnetic liquid 8 can be selected from magnetic liquids of different base carrier liquids according to the type of sealing gas/liquid and the range of ambient temperature in the actual use condition, generally, an ester-based magnetic liquid or a silicone oil-based magnetic liquid can be selected for vacuum sealing, and a silicone oil-based magnetic liquid.
Two adjacent magnetic conductive sheets 32, the permanent magnet sheet 31 located between the two adjacent magnetic conductive sheets 32, the rotating shaft 2 and the magnetic liquid 8 form a magnetic loop, and a magnetic field is formed on the magnetic conductive sheets 32, so that the magnetic liquid 8 is adsorbed on the outer peripheral surface of the magnetic conductive sheets 32 under the action of the magnetic field force, and the sealing gap is filled to play a role in sealing.
It should be noted that, when the number of the permanent magnet pieces 31 is one, the number of the magnetic conductive pieces 32 is two and the two magnetic conductive pieces are respectively disposed on two sides of the permanent magnet pieces 31, and the magnetic field is emitted from the interior of the permanent magnet and sequentially passes through one magnetic conductive piece 32, the magnetic liquid 8, the rotating shaft 2 and the other magnetic conductive piece 32 to form a closed magnetic field. When the number of the permanent magnet pieces 31 is multiple, each permanent magnet piece 31 correspondingly forms multiple closed magnetic fields, and the number of the closed magnetic fields is the same as that of the permanent magnet pieces 31.
According to the magnetic liquid sealing device with the permanent magnet pieces and the magnetic conductive pieces alternately distributed, each magnetic conductive piece 32 can form a strong magnetic field, the magnetic fields are uniformly distributed, the adsorption capacity on the magnetic liquid 8 is stronger, the magnetic liquid 8 is uniformly distributed in the sealing gap, and a higher sealing stage can be set according to the pressure-resistant requirement. In addition, because the invention adopts the mode that the magnetic conductive sheets 32 and the permanent magnet sheets 31 are alternately arranged, compared with the pole piece tooth structure in the prior art, the invention has the advantages of low production cost and simple installation process, and only needs to replace the local magnetic conductive sheets 32 or the permanent magnets after the local damage, thereby having low maintenance cost.
In some embodiments, the inner circumferential surface of the permanent magnet piece 31 and the outer circumferential surface of the rotating shaft 2 have a gap in the radial direction of the rotating shaft 2. It should be noted that the gap between the inner periphery of the permanent magnet piece 31 and the outer periphery of the rotating shaft 2 is avoided, so that the magnetic liquid 8 can flow between the seal gaps, and the gap is different from the seal gap, because the magnetic field is mainly concentrated on the magnetic conductive piece 32, and the magnetic field at the edge of the magnetic conductive piece 32 is stronger, a magnetic field with gradient is formed in the seal gap, and the magnetic liquid 8 reaches a balanced state under the combined action of differential pressure and magnetic field force, and cannot move further, so that the magnetic liquid 8 is kept in the seal gap, and a seal is formed.
Further, the permanent magnet pieces 31 and the magnetic conductive pieces 32 are both ring-shaped, that is, the permanent magnet pieces 31 and the magnetic conductive pieces 32 both have an inner diameter and an outer diameter. In some embodiments, the inner diameter of the permanent magnet piece 31 is the same as the inner diameter of the magnetic conductive piece 32, so that the inner circumference of the permanent magnet piece 31 is not flush with the inner circumference of the magnetic conductive piece 32, and together forms a cylindrical inner cavity, and even if the rotating shaft 2 rotates at a high speed, the magnetic liquid 8 does not climb from inside to outside along the radial direction of the magnetic conductive piece 32, but is always located in the sealing gap, so that the sealing performance of the magnetic liquid sealing device according to the embodiment of the present invention is more reliable. Moreover, the magnetic conductive sheet 32 and the permanent magnet sheet 31 are tightly attached to each other, so that the situation that the magnetic liquid 8 climbs outwards can be further avoided.
Preferably, the outer diameter of the permanent magnet piece 31 is the same as the outer diameter of the magnetic conductive piece 32, so that the permanent magnet piece 31 and the magnetic conductive piece 32 are aligned and attached conveniently, and the installation is convenient.
In some embodiments, the dimension of the magnetic conductive plate 32 in the axial direction of the rotating shaft 2 is 0.25-0.35mm, and the dimension of the permanent magnet plate 31 in the axial direction of the rotating shaft 2 is 0.6-3 mm. It can be understood that the upward size of the magnetic conductive sheet 32 and the permanent magnet sheet 31 in the rotating shaft 2 refers to the thickness of the magnetic conductive sheet 32 and the thickness of the permanent magnet sheet 31, and within the above size range, the permanent magnet sheet 31 can provide sufficient magnetic field strength, so that the magnetic conductive sheet 32 can replace the functions of pole shoes and pole teeth to form a strong magnetic field in the seal gap, and the magnetic conductive sheet 32, the permanent magnet sheet 31, the rotating shaft 2 and the magnetic liquid 8 form a magnetic loop to confine the magnetic liquid 8 in the seal gap to form a seal.
As shown in fig. 2, in some embodiments, the magnetic liquid 8 sealing device further includes a first magnetism isolating ring 4 and a second magnetism isolating ring 5, the first magnetism isolating ring 4 and the second magnetism isolating ring 5 are both disposed on the housing 1 and are sleeved on the outer side of the rotating shaft 2, the first magnetism isolating ring 4 is disposed at a first end of the sealing assembly 3 (e.g., a left end of the sealing assembly 3 in fig. 1), and the second magnetism isolating ring 5 is disposed at a second end of the sealing assembly 3 (e.g., a right end of the sealing assembly 3 in fig. 1). As shown in fig. 1, the first magnetism isolating ring 4 is disposed at the left end of the sealing assembly 3, and the second magnetism isolating ring 5 is disposed at the right end of the sealing assembly 3. Specifically, the materials of the first magnetism isolating ring 4 and the second magnetism isolating ring 5 are non-magnetic conducting materials, such as demagnetized 304 stainless steel or aluminum alloy materials.
The first magnetism isolating ring 4 and the second magnetism isolating ring 5 are used for isolating the sealing assembly 3 from other parts, so that the magnetic field on the magnetism conducting ring is prevented from influencing the magnetic performance of other parts, and the sealing performance of the sealing device is prevented from being reduced.
In some embodiments, the magnetic fluid sealing device further comprises a first bearing 6 and a second bearing 7, wherein the first bearing 6 and the second bearing 7 are both arranged in the housing 1 and are matched with the rotating shaft 2, so that the rotating shaft 2 and the housing 1 can rotate relatively. The first bearing 6 is disposed on a side of the first magnetism isolating ring 4 away from the sealing assembly 3 (e.g., a left side of the first magnetism isolating ring 4 in fig. 1), and the second bearing 7 is disposed on a side of the second magnetism isolating ring 5 away from the sealing assembly 3 (e.g., a right side of the second magnetism isolating ring 5 in fig. 1). In other words, a first magnetism isolating ring 4 is arranged between the first bearing 6 and the sealing component 3, and a second magnetism isolating ring 5 is arranged between the second bearing 7 and the sealing component 3.
The type of the first bearing 6 and the type of the second bearing 7 can be selected according to the axial stress under the actual working condition, such as a deep groove ball bearing or an angular contact bearing.
In some embodiments, the housing 1 includes a cylindrical member 11 and an end cap 12, the cylindrical member 11 has a cavity, a first end of the cylindrical member 11 (a left end of the cylindrical member 11 shown in fig. 1) is open and disposed so that the first end of the cavity is open, the end cap 12 is disposed at the first end of the cylindrical member 11 so as to close the first end of the cavity, and the rotation shaft 2 penetrates the end cap 12 and a second end of the cylindrical member 11 (a right end of the cylindrical member 11 shown in fig. 1).
When assembling the magnetic liquid sealing device with the permanent magnet pieces and the magnetic conductive pieces distributed alternately, the rotating shaft 2 provided with the check ring can penetrate through the cylindrical piece 11, the second bearing 7 and the second magnetism isolating ring 5 are sequentially installed on the rotating shaft 2, then the sealing assembly 3 is sleeved on the rotating shaft 2 according to the alternating sequence of the magnetic conductive pieces 32 and the permanent magnet pieces 31, the first magnetism isolating ring 4 and the first bearing 6 are installed on the rotating shaft 2, and finally the end cover 12 is installed at the first end of the cylindrical piece 11, the end cover 12 and the cylindrical piece 11 are connected through the connecting piece, and the connecting piece can be a bolt. .
It should be noted that the outer diameter of the magnetic conductive plate 32 and the outer diameter of the permanent magnet plate 31 are preferably the same as the inner diameter of the cylindrical member 11, so that the sealing assembly 3 cannot move in the radial direction of the cylindrical member 11 in the cylindrical member 11.
The periphery of the first end of the cylindrical part 11 is provided with a flange 13, the flange 13 is provided with a through hole, so that the magnetic liquid 8 sealing device can be conveniently fixed on the mounting surfaces of other parts, the end surface of the first end of the flange 13 is provided with an annular groove, and a sealing ring 14 is arranged in the annular groove, so that the air tightness between the shell 1 and the mounting surfaces of other parts is ensured. In addition, an annular groove is also provided on the end cap 12, which is used for centering during installation and facilitates installation.
In some embodiments, the rotating shaft 2 is provided with a first retaining ring 21 and a second retaining ring 22, the first retaining ring 21 and the second retaining ring 22 are both disposed around the rotating shaft 2, the first retaining ring 21 is located between the first bearing 6 and a first end of the housing 1 (e.g., a left end of the housing 1 in fig. 1), the second retaining ring 22 is located between the second bearing 7 and a second end of the housing 1 (e.g., a right end of the housing 1 in fig. 1), and the first retaining ring 21 and the second retaining ring 22 are used for limiting axial movement of the rotating shaft 2 and preventing the rotating shaft from slipping off in the axial direction.
Alternatively, in some other embodiments, the number of the retaining rings may be one, for example, only the first retaining ring 21 or only the second retaining ring 22 may be provided, as long as the function of limiting the axial movement of the rotating shaft 2 is achieved.
In some embodiments, the material of the flux-conducting plate 32 is silicon steel, which is silicon alloy steel containing 1.0-4.5% of silicon and less than 0.08% of carbon. The silicon steel has the characteristics of high magnetic permeability, low coercive force, large resistance coefficient and the like, and the hysteresis loss and the eddy current loss are very small, so the silicon steel is adopted as the material of the magnetic conductive sheet 32, the magnetic conductive sheet 32 is preferably a silicon steel sheet, and the silicon steel sheet is a common material and is mainly used for manufacturing iron cores of various transformers, motors and generators.
A magnetic-fluid seal device in which permanent magnet pieces and magnetically permeable pieces are alternately arranged according to some specific examples of the present invention is described below with reference to fig. 1 to 2.
As shown in fig. 1, the magnetic liquid sealing device with permanent magnet pieces and magnetic conductive pieces alternately distributed according to the embodiment of the present invention includes a housing 1, a rotating shaft 2, and a sealing assembly 3, where the housing 1 includes a cylindrical member 11 and an end cover 12, a first end of the cylindrical member 11 is open, the end cover 12 is disposed at the opening, the end cover 12 and the cylindrical member 11 are connected by a bolt, the rotating shaft 2 is disposed through the end cover 12 and a second end of the cylindrical member 11, and the sealing assembly 3 is disposed inside the housing 1.
As shown in fig. 2, the sealing assembly 3 includes magnetic conductive sheet 32 and permanent magnet sheet 31, the material of magnetic conductive sheet 32 is silicon steel, magnetic conductive sheet 32 and permanent magnet sheet 31 are all established in the outside of pivot 2, and magnetic conductive sheet 32 and permanent magnet sheet 31 are arranged along the axial of pivot 2 in turn, the quantity of permanent magnet sheet 31 is 16, the quantity of magnetic conductive sheet 32 is 17, each permanent magnet sheet 31 all has magnetic conductive sheet 32 in the axial both sides of arranging relatively of pivot 2, glue together and closely laminate through the adhesive between adjacent permanent magnet sheet 31 and the magnetic conductive sheet 32.
The magnetic conductive sheet 32 and the permanent magnet sheet 31 are both annular, the outer diameter of the magnetic conductive sheet 32 is the same as that of the permanent magnet sheet 31, the inner diameter of the magnetic conductive sheet 32 is the same as that of the permanent magnet sheet 31, a sealing gap is formed between the inner circumferential surface of the magnetic conductive sheet 32 and the outer circumferential surface of the rotating shaft 2 in the radial direction of the rotating shaft 2, and magnetic liquid 8 used for sealing is arranged in the sealing gap.
The outer diameter of the magnetic conductive sheet 32 and the outer diameter of the permanent magnet sheet 31 are both the same as the inner diameter of the cylindrical member 11, the outer peripheral surface of the magnetic conductive sheet 32 is in contact connection with the inner peripheral surface of the cylindrical member 11, and the outer peripheral surface of the permanent magnet sheet 31 is in contact connection with the inner peripheral surface of the cylindrical member 11.
The first end of seal assembly 3 is equipped with first magnetism isolating ring 4 and first bearing 6 along the direction of keeping away from seal assembly 3 in proper order, the second end of seal assembly 3 is equipped with second magnetism isolating ring 5 and second bearing 7 along the direction of keeping away from seal assembly 3 in proper order, first bearing 6 and second bearing 7 and pivot 2 cooperation realize pivot 2 and shell 1's relative rotation, first magnetism isolating ring 4 separates first bearing 6 and seal assembly 3, second magnetism isolating ring 5 separates second bearing 7 and seal assembly 3.
Be equipped with the retaining ring on pivot 2, the retaining ring encircles pivot 2 and sets up, and the retaining ring is located between the tip of second bearing 7 and shell 1, avoids pivot 2 to take place axial displacement.
According to the magnetic liquid sealing device provided by the embodiment of the invention, the pole shoe and pole tooth structure in the prior art is replaced by the magnetic conductive sheets 32 and the permanent magnet sheets 31 which are alternately arranged, and a magnetic field gradient exists in the sealing gap, so that the magnetic liquid 8 reaches a balanced state under the combined action of pressure difference and magnetic field force, the magnetic liquid 8 is kept in the sealing gap, reliable sealing is formed, the problem that the magnetic liquid 8 radially climbs along the pole tooth under the centrifugal force in the prior art is solved, and the magnetic liquid sealing device is easy to assemble and low in maintenance cost.
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. The utility model provides a magnetic liquid sealing device that permanent magnet piece and magnetic conduction piece distribute in turn which characterized in that includes:
a housing;
the rotating shaft penetrates through the shell and can rotate relative to the shell;
sealing assembly, sealing assembly includes permanent magnet piece and magnetic conduction piece, the magnetic conduction piece with the permanent magnet piece is all established in the shell and the cover is established the outside of pivot, the magnetic conduction piece with the permanent magnet piece is followed the axial of pivot is arranged in turn, the permanent magnet piece is in the axial of pivot is relative both sides of arranging all have the magnetic conduction piece, and adjacent the magnetic conduction piece with closely laminate between the permanent magnet piece, the inner peripheral surface of magnetic conduction piece with the outer peripheral face of pivot is in the footpath of pivot radially has sealed clearance, have in the sealed clearance and be used for sealed magnetic liquid, adjacent two the magnetic conduction piece, be located this adjacent two permanent magnet between the magnetic conduction piece the pivot with magnetic liquid forms magnetic circuit.
2. The device as claimed in claim 1, wherein the permanent magnet pieces and the magnetic conductive pieces are alternately arranged, and the inner circumferential surface of the permanent magnet pieces and the outer circumferential surface of the rotating shaft have a gap in a radial direction of the rotating shaft.
3. The device as claimed in claim 1, wherein the permanent magnet pieces and the magnetic conductive pieces are annular, and the inner diameter of the permanent magnet pieces is the same as the inner diameter of the magnetic conductive pieces.
4. The device as claimed in claim 1, wherein the dimension of the magnetic conductive plates in the axial direction of the shaft is 0.25-0.35mm, and the dimension of the permanent magnet plates in the axial direction of the shaft is 0.6-3 mm.
5. The apparatus as claimed in claim 1, further comprising a first magnetic isolating ring and a second magnetic isolating ring, wherein the first magnetic isolating ring and the second magnetic isolating ring are disposed on the housing and are disposed on the outer side of the rotating shaft, the first magnetic isolating ring is disposed on the first end of the sealing assembly, and the second magnetic isolating ring is disposed on the second end of the sealing assembly.
6. The device as claimed in claim 1, further comprising a first bearing and a second bearing, wherein the first bearing and the second bearing are both disposed in the housing and engaged with the shaft, the first bearing is disposed on a side of the first magnetism isolating ring away from the sealing assembly, and the second bearing is disposed on a side of the second magnetism isolating ring away from the sealing assembly.
7. The device as claimed in claim 1, wherein the housing comprises a cylindrical member having a cavity, the first end of the cylindrical member is open to open the first end of the cavity, and an end cap disposed at the first end of the cylindrical member to close the first end of the cavity, the shaft penetrates the end cap.
8. The device as claimed in claim 6, wherein said rotating shaft is provided with a first retaining ring and a second retaining ring, said first retaining ring and said second retaining ring are both disposed around said rotating shaft, said first retaining ring is located between said first bearing and said first end of said housing, and said second retaining ring is located between said second bearing and said second end of said housing.
9. The device as claimed in any one of claims 1-8, wherein said magnetic conducting plates are made of silicon steel.
10. The apparatus as claimed in claim 9, wherein the first magnetism isolating ring, the second magnetism isolating ring and the housing are made of non-magnetic materials.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010862984.XA CN112145698A (en) | 2020-08-25 | 2020-08-25 | Magnetic liquid sealing device with permanent magnet sheets and magnetic conductive sheets alternately distributed |
| PCT/CN2020/115992 WO2022041349A1 (en) | 2020-08-25 | 2020-09-17 | Magnetic liquid sealing apparatus having alternately distributed permanent magnet piece and magnetically permeable piece |
| JP2023513247A JP7458676B2 (en) | 2020-08-25 | 2020-09-17 | Toothless magnetic fluid sealing device with alternating distribution of permanent magnet sheets and magnetically permeable sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010862984.XA CN112145698A (en) | 2020-08-25 | 2020-08-25 | Magnetic liquid sealing device with permanent magnet sheets and magnetic conductive sheets alternately distributed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112145698A true CN112145698A (en) | 2020-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010862984.XA Pending CN112145698A (en) | 2020-08-25 | 2020-08-25 | Magnetic liquid sealing device with permanent magnet sheets and magnetic conductive sheets alternately distributed |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7458676B2 (en) |
| CN (1) | CN112145698A (en) |
| WO (1) | WO2022041349A1 (en) |
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| US5057952A (en) * | 1988-12-28 | 1991-10-15 | Kabushiki Kaisha Toshiba | Magnetic fluid sealing apparatus for a magnetic disk drive |
| US5153470A (en) * | 1990-05-31 | 1992-10-06 | Nippon Densan Corporation | Spindle motor |
| CN1384298A (en) * | 2001-04-30 | 2002-12-11 | 罗喜梅 | Magnetic fluid sealed transmission structure for reciprocating or rotating shaft |
| CN2603249Y (en) * | 2002-03-23 | 2004-02-11 | 李名民 | Magnetic fluid seal structure for driving-axle |
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| CN206563080U (en) * | 2017-02-24 | 2017-10-17 | 自贡兆强环保科技股份有限公司 | A kind of vacuum mixer magnetic fluid seal device |
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| JP2584951Y2 (en) * | 1993-06-11 | 1998-11-11 | 日本精工株式会社 | Rolling bearing unit with magnetic fluid seal device |
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| JP3766866B2 (en) | 2002-04-04 | 2006-04-19 | 独立行政法人物質・材料研究機構 | Magnetic fluid seal rotary bearing |
| CN103498939B (en) * | 2013-08-27 | 2016-02-10 | 北京交通大学 | A kind of seal arrangement improving magnetic fluid sealing voltage endurance capability and sealing reliability |
| CN106641273B (en) * | 2017-02-24 | 2018-02-06 | 自贡兆强环保科技股份有限公司 | A kind of chemical reactor magnetic fluid seal device and its control system |
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2020
- 2020-08-25 CN CN202010862984.XA patent/CN112145698A/en active Pending
- 2020-09-17 JP JP2023513247A patent/JP7458676B2/en active Active
- 2020-09-17 WO PCT/CN2020/115992 patent/WO2022041349A1/en active Application Filing
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| US5057952A (en) * | 1988-12-28 | 1991-10-15 | Kabushiki Kaisha Toshiba | Magnetic fluid sealing apparatus for a magnetic disk drive |
| US5153470A (en) * | 1990-05-31 | 1992-10-06 | Nippon Densan Corporation | Spindle motor |
| CN1384298A (en) * | 2001-04-30 | 2002-12-11 | 罗喜梅 | Magnetic fluid sealed transmission structure for reciprocating or rotating shaft |
| CN2603249Y (en) * | 2002-03-23 | 2004-02-11 | 李名民 | Magnetic fluid seal structure for driving-axle |
| CN103115152A (en) * | 2013-01-30 | 2013-05-22 | 北京交通大学 | Magnetic fluid and maze alternated type combined sealing |
| CN103234049A (en) * | 2013-04-12 | 2013-08-07 | 北京交通大学 | Method for improving sealing reliability and prolonging service life of split magnetic liquid sealing device |
| CN204533540U (en) * | 2015-02-06 | 2015-08-05 | 顾志情 | A kind of magnetic fluid seal axle |
| CN206386479U (en) * | 2016-12-09 | 2017-08-08 | 北京交通大学 | A kind of magnetic fluid seal device that operating mode is rotated suitable for high linear speed |
| CN206563080U (en) * | 2017-02-24 | 2017-10-17 | 自贡兆强环保科技股份有限公司 | A kind of vacuum mixer magnetic fluid seal device |
| CN206608552U (en) * | 2017-02-24 | 2017-11-03 | 自贡兆强环保科技股份有限公司 | A kind of chemical reactor magnetic fluid seal device and its control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7458676B2 (en) | 2024-04-01 |
| WO2022041349A1 (en) | 2022-03-03 |
| JP2023533611A (en) | 2023-08-03 |
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Application publication date: 20201229 |