CN114294424A - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
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- CN114294424A CN114294424A CN202111505536.5A CN202111505536A CN114294424A CN 114294424 A CN114294424 A CN 114294424A CN 202111505536 A CN202111505536 A CN 202111505536A CN 114294424 A CN114294424 A CN 114294424A
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Abstract
The invention discloses a magnetic liquid sealing device, which comprises a shell, a shaft, a plurality of pole shoes, a magnetic source part, a conductor sheet and an insulating gasket, wherein the shell is provided with a cavity, the shaft can rotatably penetrate through the shell, at least part of the shaft is positioned in the cavity, the pole shoes are arranged in the cavity and sleeved on the shaft, the pole shoes are arranged at intervals along the axial direction of the shaft, the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft, the magnetic source part is arranged in the cavity and sleeved on the shaft, the magnetic source part is arranged between two adjacent pole shoes, the magnetic source part can generate a magnetic field, the conductor sheet is arranged at the inner circumferential side of the pole shoes, the conductor sheet and the shaft are arranged at intervals along the radial direction of the shaft to form a sealing gap, and the rotating center of the shaft does not coincide with the shaft center of the shaft, so that the seal gap changes as the shaft rotates, and an insulating spacer is provided between the conductor sheet and the pole shoe. The magnetic liquid sealing device has the advantages of simple structure, long service life and the like.
Description
Technical Field
The invention relates to the field of mechanical sealing, in particular to a magnetic liquid sealing device.
Background
Magnetic liquid sealing devices are widely used in more and more industries as a sealing method capable of realizing zero leakage. The working principle is that under the action of magnetic field generated by permanent magnet, the magnetic liquid placed between rotating shaft and gap of top end of pole tooth is concentrated to form a "0" ring, so that the gap channel is blocked to attain the goal of sealing.
In the related technology, the magnetic liquid sealing device is easy to lose efficacy under the low-temperature working condition, and the service life is short.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the viscosity of the magnetic liquid is exponentially increased along with the reduction of the temperature, and under a low-temperature environment, the magnetic liquid sealing device can cause sealing failure due to overlarge friction torque caused by the increase of the viscosity of the magnetic liquid, so that serious consequences are caused, and huge economic loss is brought.
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 the magnetic liquid sealing device which is long in service life, simple in structure and strong in low-temperature resistance.
The magnetic liquid sealing device of the embodiment of the invention comprises: a housing having a chamber; a shaft rotatably extending through the housing, at least a portion of the shaft being located within the chamber; the pole shoes are arranged in the cavities and sleeved on the shaft, the pole shoes are arranged at intervals along the axial direction of the shaft, and the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft; the magnetic source component is arranged in the cavity and sleeved on the shaft, is arranged between two adjacent pole shoes and can generate a magnetic field; the conductor sheet is arranged on the inner peripheral side of the pole shoe, the conductor sheet and the shaft are arranged at intervals along the radial direction of the shaft to form a sealing gap, and the rotation center of the shaft does not coincide with the axis of the shaft, so that the sealing gap is changed when the shaft rotates; an insulating spacer disposed between the conductor sheet and the pole piece.
According to the magnetic liquid sealing device provided by the embodiment of the invention, the conductor sheet and the magnetic source component are arranged, and in the rotating process of the shaft, the sealing gap between the conductor sheet and the shaft is changed, so that the magnetic flux of the conductor sheet is changed, the conductor sheet generates eddy current, the conductor sheet heats the magnetic liquid, the viscosity of the magnetic liquid is reduced, and the service life of the magnetic liquid is prolonged.
In some embodiments, the inner circumferential surface of the pole piece is provided with a plurality of pole teeth, the plurality of pole teeth are arranged at intervals along the axial direction of the shaft, and at least one pole tooth is provided with the conductor sheet.
In some embodiments, the plurality of conductor sheets are divided into a plurality of rows, each row of conductor sheets includes a plurality of conductor sheets arranged at intervals along the circumferential direction of the shaft, and the plurality of rows of conductor sheets are arranged on the plurality of pole teeth in a one-to-one correspondence.
In some embodiments, the conductor sheet is a plurality of conductor sheets, the plurality of conductor sheets are arranged at intervals along the circumference of the shaft, and each conductor sheet can be connected with a plurality of pole teeth.
In some embodiments, the plurality of pole teeth includes a plurality of first pole teeth and a plurality of second pole teeth, the conductor piece is provided on an inner peripheral surface of the first pole teeth, the magnetic liquid is filled between the second pole teeth and the shaft, and the first pole teeth and the second pole teeth are alternately provided in an axial direction of the shaft.
In some embodiments, an inner peripheral surface of the second tooth and an inner peripheral surface of the conductor piece are flush in an inward and outward direction.
In some embodiments, the inner circumferential surface of the insulating spacer is provided with grooves spaced apart along the circumference of the shaft, and each of the grooves is provided with the conductor piece therein.
In some embodiments, the magnetic liquid sealing device 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 arranged in the housing and sleeved on the shaft, the first magnetism isolating ring and the second magnetism isolating ring are arranged at intervals in the axial direction of the shaft, and a plurality of pole shoes are located between the first magnetism isolating ring and the second magnetism isolating ring; the first eccentric bearing and the second eccentric bearing are arranged in the shell and are arranged on the shaft, and the first magnetism isolating ring and the second magnetism isolating ring are positioned between the first eccentric bearing and the second eccentric bearing.
In some embodiments, the chamber has a plurality of sub-chambers which are communicated in sequence in the circumferential direction of the shaft, the magnetic source component comprises a plurality of permanent magnets, at least one permanent magnet is arranged in each sub-chamber, and the magnetic field intensity generated by the permanent magnets in two adjacent sub-chambers is different or the magnetic field intensity is the same.
In some embodiments, the magnetic fluid seal further comprises a permanent magnet ring disposed within the chamber and disposed about the shaft, the permanent magnet ring configured to generate a uniform magnetic field, the permanent magnet ring disposed between a portion of the plurality of pole pieces, the magnetic source member disposed between another portion of the plurality of pole pieces.
Drawings
Fig. 1 is a schematic structural view of a magnetic fluid sealing apparatus according to an embodiment of the present invention.
Fig. 2 is a sectional view of a magnetic fluid seal apparatus removing a shaft according to an embodiment of the present invention.
Fig. 3 is a partially enlarged view of a in fig. 1.
Reference numerals:
a magnetic liquid sealing device 100;
a housing 1; a chamber 11; a sub-chamber 111; a shaft 2; a pole shoe 3; the pole teeth 31; a magnetic source part 4; a permanent magnet 41; a conductor piece 5; an insulating spacer 6; a magnetic liquid 7; a first magnetism isolating ring 8; a second magnetism isolating ring 9; a first eccentric bearing 10; a second eccentric bearing 101.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A magnetic liquid sealing apparatus according to an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1 to 3, the magnetic fluid sealing device of the embodiment of the present invention includes a housing 1, a shaft 2, a plurality of pole pieces 3, a magnetic source member 4, a conductor sheet 5, and an insulating gasket 6.
The housing 1 has a chamber 11.
The shaft 2 is rotatably penetrated within the housing 1, at least part of the shaft 2 being located within the chamber 11.
The plurality of pole shoes 3 are disposed in the cavity 11 and sleeved on the shaft 2, the plurality of pole shoes 3 are disposed at intervals along an axial direction (a left-right direction as shown in fig. 1) of the shaft 2, and inner circumferential surfaces of the plurality of pole shoes 3 and an outer circumferential surface of the shaft 2 are disposed at intervals along a radial direction of the shaft 2. Specifically, as shown in fig. 1, the plurality of pole shoes 3 are fitted over the shaft 2, and the plurality of pole shoes 3 are arranged at intervals in the left-right direction.
The magnetic source part 4 is arranged in the cavity 11 and sleeved on the shaft 2, the magnetic source part 4 is arranged between two adjacent pole shoes 3, and the magnetic source part 4 can generate a magnetic field. Specifically, as shown in fig. 1, one of the left and right ends of the magnetic source unit 4 is an N pole, the other of the left and right ends of the magnetic source unit 4 is an S pole, and the magnetic source unit 4 generates magnetic fields of the same intensity in the circumferential direction of the shaft 2, or the magnetic source unit 4 generates magnetic fields of different intensities in the circumferential direction of the shaft 2, or the magnetic source unit 4 generates a magnetic field that gradually increases in the circumferential direction of the shaft 2, or the magnetic source unit 4 generates a magnetic field that gradually decreases in the circumferential direction of the shaft 2.
The conductor piece 5 is arranged on the inner peripheral side of the pole piece 3, the conductor piece 5 and the shaft 2 are arranged at intervals along the radial direction of the shaft 2 to form a sealing gap, and the rotation center of the shaft 2 is not overlapped with the shaft center of the shaft 2, so that the sealing gap is changed when the shaft 2 rotates. Specifically, as shown in fig. 1 to 3, the shaft 2 is an eccentric shaft, so that the distance between the inner circumference side of the conductor piece 5 and the outer circumference side of the shaft 2 is unequal, and in the rotation process of the shaft 2, the sealing gap between the shaft 2 and the conductor piece 5 changes, so that the magnetic flux of the conductor piece 5 changes, a vortex is generated inside the conductor piece 5, and heat generated by the vortex can be transferred to the magnetic liquid 7, so that the temperature of the magnetic liquid 7 is increased, the viscosity of the magnetic liquid 7 is reduced, and the friction torque of the sealing device of the magnetic liquid 7 is reduced.
An insulating spacer 6 is provided between the conductor strip 5 and the pole piece 2. Specifically, as shown in fig. 1, the insulating spacer 6 has an insulating capability, and the pole piece 3 and the conductor piece 5 are spaced by the insulating spacer 6, so that the pole piece 2 and the conductor piece 5 are prevented from forming an integral body to influence the generation of eddy current.
The magnetic source part 4, the pole shoe 3, the conductor sheet 5 and the shaft 2 form a closed magnetic circuit, a non-uniform magnetic field with alternate intensity is generated in a pole tooth gap of the pole shoe 3 through the magnetic source part 4, and the magnetic liquid 7 is absorbed between the pole shoe 2 and the conductor sheet 5, so that the magnetic liquid 7 is filled in the gap, and the sealing purpose is achieved.
It can be understood that: when the magnetic source component 4 generates a uniform magnetic field, the magnetic field intensity received by the conductor sheet 5 is inversely related to the distance between the conductor sheet 5 and the pole shoe 3, that is, the larger the distance between the conductor sheet 5 and the pole shoe 3 is, the weaker the magnetic field intensity received by the conductor sheet 5 is, and the smaller the distance between the conductor sheet 5 and the pole shoe 3 is, the stronger the magnetic field intensity received by the conductor sheet 5 is.
According to the magnetic liquid sealing device 100 provided by the embodiment of the invention, the shaft 2 and the conductor sheet 5 are arranged, when the shaft 2 rotates, the sealing gap between the conductor sheet 5 and the shaft 2 is changed, so that the conductor sheet 5 generates a vortex, the magnetic liquid 7 is heated, the viscosity of the magnetic liquid 7 is reduced, the friction torque of the magnetic liquid 7 sealing device is reduced, and the service life of the magnetic liquid sealing device 100 is prolonged.
Since the pole teeth 31 can increase the magnetic field intensity between the pole shoe 3 and the shaft 2, the inner circumferential surface of the pole shoe 3 is provided with the plurality of pole teeth 31, so that the magnetic liquid 7 can be more firmly adsorbed between the pole shoe 3 and the shaft 2, in some embodiments, the inner circumferential surface of the pole shoe 3 is provided with the plurality of pole teeth 31, the plurality of pole teeth 31 are arranged at intervals along the axial direction of the shaft 2, and at least one pole tooth 31 is provided with the conductor sheet 5. Specifically, as shown in fig. 1 to 3, a plurality of pole teeth 31 are arranged on the inner circumferential surface of the pole piece 3 at intervals in the left-right direction, the inner circumferential surface of the pole teeth 31 is provided with an insulating gasket 6, and the inner circumferential surface of the insulating gasket 6 is provided with a conductor sheet 5, so that the sealing effect of the magnetic fluid sealing device 100 is improved under the condition that eddy current generated by the conductor sheet 5 is not influenced.
In some embodiments, the plurality of conductor sheets 5 is divided into a plurality of rows, each row of conductor sheets 5 includes a plurality of conductor sheets 5 arranged at intervals along the circumference of the shaft 2, and the plurality of rows of conductor sheets 5 are arranged on the plurality of pole teeth 31 in a one-to-one correspondence. Specifically, as shown in fig. 1, each of the pole teeth 31 is provided with a plurality of conductor pieces 5, and the plurality of conductor pieces 5 are arranged at intervals along the circumferential direction of the shaft 2, so that the heating efficiency of the conductor pieces 5 is improved, and the magnetic liquid sealing device 100 is more reasonable in arrangement.
In some embodiments, the conductor strip 5 is provided in plurality, the plurality of conductor strips 5 are arranged at intervals along the circumference of the shaft 2, and each conductor strip 5 can be connected with a plurality of pole teeth 31. Specifically, the conductor piece 5 may extend in the left-right direction, so that the conductor piece 5 may be attached to the plurality of pole teeth 31 on the pole piece 3, in other words, the inner circumferential surfaces of the plurality of pole teeth 31 may be connected to one conductor piece 5, thereby improving the heating efficiency of the conductor piece 5, preventing the magnetic liquid 7 from flowing into the gap between two adjacent pole teeth 31, further improving the sealing effect of the magnetic liquid sealing device 100, and prolonging the service life of the magnetic liquid sealing device 100.
In some embodiments, the plurality of teeth 31 includes a plurality of first teeth (not shown) and a plurality of second teeth (not shown), the conductor sheet 5 is provided on an inner peripheral surface of the first teeth, the magnetic liquid 7 is filled between the second teeth and the shaft 2, and the first teeth and the second teeth are alternately provided in the axial direction of the shaft 2.
Specifically, the inner circumferential surface of the first tooth is provided with a conductor strip 5, the inner circumferential surface of the second tooth is not provided with a conductor strip 5 and is directly filled with the magnetic liquid 7, and the first pole piece and the second pole piece can be arranged on the shaft 2 according to requirements, such as: two utmost point teeth 31 in the outermost side of a plurality of utmost point teeth 31 are first utmost point tooth, and remaining be the second utmost point tooth, or first utmost point tooth and a plurality of second utmost point tooth are along the upward interval setting of left right direction, from this when guaranteeing magnetic fluid sealing device 100's sealed effect, have reduced magnetic fluid sealing device 100's manufacturing and installation degree of difficulty, have reduced magnetic fluid sealing device 100's manufacturing cost.
Since the magnetic field intensity received by the magnetic liquid 7 is inversely related to the size of the seal gap, in some embodiments, the inner circumferential surface of the second pole tooth and the inner circumferential surface of the conductor piece 5 are flush in the inward and outward direction. Thereby the magnetic field intensity between second utmost point tooth and axle 2 has been improved for first utmost point tooth, conductor piece 5 and second utmost point tooth set up more rationally.
In some embodiments, the inner circumferential surface of the insulating spacer 6 is provided with grooves (not shown) spaced circumferentially along the shaft 2, each groove having a conductor strip 5 disposed therein. Specifically, as shown in fig. 1 to 3, the insulating pad 6 is sleeved on the shaft 2, a plurality of grooves are formed in the outer peripheral side of the insulating pad 6, the plurality of grooves are arranged at intervals along the circumferential direction of the shaft 2, and one conductor piece 5 is embedded in each groove, so that the insulating pad 6 and the plurality of conductor pieces 5 form a whole, and the insulating pad 6 and the plurality of conductor pieces 5 are convenient to install and manufacture.
In some embodiments, the magnetic fluid seal apparatus 100 further comprises a first magnetism isolating ring 8, a second magnetism isolating ring 9, a first eccentric bearing 10, and a second eccentric bearing 101.
The first magnetism isolating ring 8 and the second magnetism isolating ring 9 are arranged in the shell 1 and sleeved on the shaft 2, the first magnetism isolating ring 8 and the second magnetism isolating ring 9 are arranged at intervals in the axial direction of the shaft 2, and the plurality of pole shoes 3 are arranged between the first magnetism isolating ring 8 and the second magnetism isolating ring 9. Specifically, as shown in fig. 1, a first magnetism isolating ring 8 and a second magnetism isolating ring 9 are disposed in a housing 1 and are sleeved on a shaft 2, an outer circumferential surface of the first magnetism isolating ring 8 is attached to an inner circumferential surface of the housing 1, an outer circumferential surface of the second magnetism isolating ring 9 is attached to the inner circumferential surface of the housing 1, the first magnetism isolating ring 8 is disposed on a left side of a plurality of pole shoes 3, and the second magnetism isolating ring 9 is disposed on a right side of the plurality of pole shoes 3. Therefore, the first magnetism isolating ring 8 and the second magnetism isolating ring 9 can prevent the magnetic force lines generated by the permanent magnet 41 from leaking from the two ends of the plurality of pole shoes 3, and further enhance the sealing performance of the magnetic liquid sealing device 100.
The first eccentric bearing 10 and the second eccentric bearing 101 are arranged in the shell 1 and are arranged on the shaft 2, and the first magnetism isolating ring 8 and the second magnetism isolating ring 9 are positioned between the first eccentric bearing 10 and the second eccentric bearing 101. Specifically, as shown in fig. 1, the first eccentric bearing 10 and the second eccentric bearing 101 are both sleeved on the shaft 2, the first eccentric bearing 10 is disposed on the left side of the first magnetism isolating ring 8, the second eccentric bearing 101 is disposed on the right side of the second magnetism isolating ring 9, and outer rings of the first eccentric bearing 10 and the second eccentric bearing 101 are in clearance fit with an inner circumferential surface of the housing 1, so that not only can the shaft 2 be ensured to rotate smoothly in the housing 1, but also an axis of the shaft 2 is not coincident with an axis of the pole shoe 3 through the first eccentric bearing 10 and the second eccentric bearing 101, in other words, an axis of the shaft 2 is not coincident with a rotation center of the shaft 2, and it is ensured that a sealing clearance is changed when the shaft 2 rotates.
In some embodiments, the chamber 11 has a plurality of sub-chambers 111 in communication in sequence in the circumferential direction of the shaft 2,
the magnetic source component 4 comprises a plurality of permanent magnets 41, at least one permanent magnet 41 is arranged in each sub-chamber 111, and the magnetic field intensity generated by the permanent magnets 41 in two adjacent sub-chambers 111 is different or the same.
Specifically, the chamber 11 has a plurality of sub-chambers 111 which are sequentially communicated in the circumferential direction of the shaft 2, the magnetic source part 4 comprises a plurality of permanent magnets 41, and at least one permanent magnet 41 is arranged in each sub-chamber 111, so that the magnetic source part 4 generates magnetic fields with different strengths in the circumferential direction of the shaft 2, or the magnetic source part 4 generates magnetic fields with gradually increasing strength in the circumferential direction of the shaft 2, or the magnetic source part 4 generates magnetic fields with gradually decreasing strength in the circumferential direction of the shaft 2, or the magnetic source part 4 generates uniform magnetic fields, so that the chamber 11 and the magnetic source part 4 are more reasonably arranged.
In some embodiments, the number of permanent magnets 41 in two adjacent sub-chambers 111 is different. Specifically, as shown in fig. 2, the arrangement of the permanent magnet 41 in the sub-chamber 111 may be set according to actual conditions, for example: the number of the permanent magnets 41 in the sub-chamber 111 may be plural, the plural permanent magnets 41 are arranged at intervals in the circumferential direction of the shaft 2, the interval between two adjacent permanent magnets 41 in one sub-chamber 111 is a first interval, the interval between two adjacent permanent magnets 41 in another sub-chamber 111 is a second interval, and the first interval is larger than the second interval, in other words, the plural permanent magnets 41 are arranged at intervals in the circumferential direction of the shaft, and the intervals between the plural permanent magnets 41 are sequentially reduced, so that the magnetic field strengths generated by the plural permanent magnets 41 in the circumferential direction of the shaft 2 are different. Or for example, the number of the permanent magnets 41 in two adjacent sub-chambers 111 is different, and the plurality of permanent magnets 41 in each sub-chamber 111 are sequentially arranged along the radial direction of the shaft 2, so that the magnetic field strengths generated by the permanent magnets 41 in two adjacent chambers 11 are different.
In some embodiments, the material of the permanent magnet 41 in two adjacent sub-chambers 111 is different. Thus, the magnetic field strength generated by the permanent magnet 41 in the two adjacent sub-chambers 111 can be made different by the material of the permanent magnet 41.
It will be appreciated that the material in the plurality of conductor strips 5 may also be different.
In some embodiments, a plurality of permanent magnets 41 are arranged at equal intervals in the circumferential direction of the shaft 2, and the cross-sectional area of two adjacent permanent magnets 41 in the radial direction of the shaft 2 is different. Specifically, the arrangement of the plurality of permanent magnets 41 may be set according to actual conditions, for example: the plurality of permanent magnets 41 may be arranged at equal intervals in the circumferential direction of the shaft 2, and the cross-sectional area of two adjacent permanent magnets 41 in the radial direction of the shaft 2 is different, or for example: the plurality of permanent magnets 41 can be arranged at unequal intervals in the circumferential direction of the shaft 2, and the cross-sectional areas of the two adjacent permanent magnets 41 in the radial direction of the shaft 2 are different, so that the magnetic field strengths generated by the plurality of permanent magnets 41 in the circumferential direction of the shaft 2 are different, and the arrangement of the permanent magnets 41 is more reasonable.
It is understood that, when the plurality of permanent magnets 41 may be arranged at unequal intervals in the circumferential direction of the shaft 2, the cross-sectional areas of two adjacent permanent magnets 41 in the radial direction of the shaft 2 may be the same, and the permanent magnets 41 may have a rectangular parallelepiped shape, a cylindrical shape, a polygonal prism shape, or the like.
In some embodiments, the magnetic source part 4 further comprises a connecting member (not shown in the drawings), the connecting member is arranged in the cavity 11 and sleeved on the shaft 2, the connecting member is arranged between two adjacent pole shoes 3, one side of the connecting member is provided with a mounting hole penetrating through the connecting member, and the permanent magnet 41 is arranged in the mounting hole. Specifically, the connecting piece is circular, one side of the connecting piece is provided with a plurality of mounting holes penetrating through the connecting piece, the positions of the mounting holes can be arranged according to the actual setting condition of the permanent magnets 41, the permanent magnets 41 can be mounted in the mounting holes, and therefore the plurality of permanent magnets 41 are integrated through the connecting piece, and the mounting and the manufacturing of the plurality of permanent magnets 41 are facilitated.
In some embodiments, the magnetic source component 4 is a first permanent magnet ring (not shown), which is sleeved on the shaft 2 and includes a plurality of connecting sections connected to each other, and the cross-sectional area of two adjacent connecting sections along the radial direction of the shaft 2 is different. So that the first permanent magnet ring can emit magnetic fields of different strengths in the circumferential direction of the shaft 2.
In some embodiments, the magnetic source unit 4 includes a plurality of magnetic source units (not shown in the drawings) spaced apart along a circumferential direction of the shaft 2, the magnetic source units include cores (not shown in the drawings) and coils (not shown in the drawings), the coils are wound on outer circumferential sides of the cores, the number of turns of the coils wound on the cores of two adjacent magnetic source units is different, and/or the shapes and sizes of two adjacent cores are different. Therefore, when the coil is electrified, the iron core is magnetized, so that the magnetic source unit generates a magnetic field, and the size of the magnetic field generated by the magnetic source unit is adjusted by adjusting the size of the current. When the shaft 2 needs to be started, the current is reduced, so that the magnetic field intensity generated by the magnetic source unit is reduced, the starting torque of the shaft 2 is reduced, the required power when the starting shaft 2 rotates can be reduced, and the magnetic source part 4 can generate magnetic fields with different intensities along the circumferential direction of the shaft 2 due to the fact that the number of turns of coils wound by the iron cores of two adjacent magnetic source units is different, or the shapes and the sizes of the two adjacent iron cores are different, so that the conductor sheet 5 generates eddy current to heat the magnetic liquid 7, and the viscosity of the magnetic liquid 7 is reduced.
In some embodiments, the magnetic fluid seal apparatus 100 further comprises a permanent magnet ring (not shown) disposed in the chamber 11 and fitted over the shaft 2, the permanent magnet ring being disposed between a portion of the plurality of pole pieces 3, and the magnetic source member 4 being disposed between another portion of the plurality of pole pieces 3. Specifically, the cross-sectional area of the permanent magnet ring in the radial direction is equal everywhere so that the permanent magnet ring generates a uniform magnetic field in the circumferential direction of the shaft 2, and the arrangement of the permanent magnet ring and the magnetic source part 4 may be set according to the actual circumstances, for example: the magnetic source part 4 and the permanent magnet ring are alternately arranged, or for example: one part of the plurality of magnetic source components 4 is arranged at the left section of the shaft 2, the other part of the plurality of magnetic source components 4 is arranged at the right section of the shaft 2, and the permanent magnetic ring is arranged between one part of the plurality of magnetic source components 4 and the other part of the plurality of magnetic source components 4, so that the processing and manufacturing difficulty of the magnetic liquid sealing device 100 is reduced and the viscosity of the magnetic liquid 7 is ensured through the arrangement of the permanent magnetic ring.
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 fluid seal assembly, comprising:
a housing having a chamber;
a shaft rotatably extending through the housing, at least a portion of the shaft being located within the chamber;
the pole shoes are arranged in the cavities and sleeved on the shaft, the pole shoes are arranged at intervals along the axial direction of the shaft, and the inner circumferential surfaces of the pole shoes and the outer circumferential surface of the shaft are arranged at intervals along the radial direction of the shaft;
the magnetic source component is arranged in the cavity and sleeved on the shaft, is arranged between two adjacent pole shoes and can generate a magnetic field;
the conductor sheet is arranged on the inner peripheral side of the pole shoe, the conductor sheet and the shaft are arranged at intervals along the radial direction of the shaft to form a sealing gap, and the rotation center of the shaft does not coincide with the axis of the shaft, so that the sealing gap is changed when the shaft rotates;
an insulating spacer disposed between the conductor sheet and the pole piece.
2. The magnetic fluid seal of claim 1, wherein said pole piece has an inner circumferential surface provided with a plurality of pole teeth spaced axially along said shaft, at least one of said pole teeth being provided with said conductor sheet.
3. The magnetic liquid sealing device according to claim 2, wherein the plurality of conductor pieces are divided into a plurality of rows, each row of conductor pieces includes a plurality of conductor pieces arranged at intervals in a circumferential direction of the shaft, and the plurality of rows of conductor pieces are arranged on the plurality of pole teeth in a one-to-one correspondence.
4. The magnetic fluid seal of claim 2 wherein said conductor sheet is a plurality of said conductor sheets spaced circumferentially about said shaft, each of said conductor sheets being connectable to a plurality of said teeth.
5. The magnetic fluid seal device according to claim 2, wherein the plurality of pole teeth include a plurality of first pole teeth and a plurality of second pole teeth, the conductor piece is provided on an inner peripheral surface of the first pole teeth, the magnetic fluid is filled between the second pole teeth and the shaft, and the first pole teeth and the second pole teeth are alternately provided in an axial direction of the shaft.
6. The magnetic fluid sealing device according to claim 5, wherein an inner peripheral surface of the second tooth and an inner peripheral surface of the conductor piece are flush in an inward and outward direction.
7. The magnetic fluid seal apparatus of claim 1, wherein said insulating spacer has grooves formed on an inner peripheral surface thereof, said grooves being spaced apart from each other in a circumferential direction of said shaft, each of said grooves having said conductor piece disposed therein.
8. The magnetic fluid seal apparatus of any one of claims 1 to 7 further comprising a first magnetism isolating ring and a second magnetism isolating ring, said first magnetism isolating ring and said second magnetism isolating ring being disposed within said housing and sleeved on said shaft, said first magnetism isolating ring and said second magnetism isolating ring being spaced apart in an axial direction of said shaft, a plurality of said pole shoes being disposed between said first magnetism isolating ring and said second magnetism isolating ring;
the first eccentric bearing and the second eccentric bearing are arranged in the shell and are arranged on the shaft, and the first magnetism isolating ring and the second magnetism isolating ring are positioned between the first eccentric bearing and the second eccentric bearing.
9. The magnetic liquid seal device according to any one of claims 1 to 7, wherein the chamber has a plurality of sub-chambers communicating in sequence in a circumferential direction of the shaft,
the magnetic source part comprises a plurality of permanent magnets, each sub-chamber is at least internally provided with one permanent magnet, and the magnetic field intensity generated by the permanent magnet in the sub-chamber is different or the magnetic field intensity is the same.
10. The magnetic fluid seal apparatus of claim 9 further comprising a permanent magnet ring disposed within said chamber and disposed about said shaft, said permanent magnet ring configured to generate a uniform magnetic field, said permanent magnet ring disposed between a portion of said plurality of pole pieces, said magnetic source member disposed between another portion of said plurality of pole pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111505536.5A CN114294424B (en) | 2021-12-10 | 2021-12-10 | Magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111505536.5A CN114294424B (en) | 2021-12-10 | 2021-12-10 | Magnetic liquid sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114294424A true CN114294424A (en) | 2022-04-08 |
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| US5826885A (en) * | 1996-10-02 | 1998-10-27 | Rigaku/Usa, Inc. | Magnetic fluid sealing device |
| JP2004138138A (en) * | 2002-10-17 | 2004-05-13 | Nok Corp | Magnetic fluid sealing device |
| CN102537367A (en) * | 2012-01-12 | 2012-07-04 | 北京理工大学 | Shaft sealing device with magnetic fluids |
| CN105546123A (en) * | 2016-03-07 | 2016-05-04 | 广西科技大学 | Device and method for reducing eccentricity of rotating shaft of large-gap magnetic fluid sealing system |
| CN112212011A (en) * | 2020-10-30 | 2021-01-12 | 清华大学 | Magnetic liquid sealing device |
| CN112728100A (en) * | 2020-12-28 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112728104A (en) * | 2020-12-31 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device with pole teeth filled with porous material |
| US11092241B1 (en) * | 2020-10-30 | 2021-08-17 | Tsinghua University | Magnetic fluid sealing device |
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2021
- 2021-12-10 CN CN202111505536.5A patent/CN114294424B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5826885A (en) * | 1996-10-02 | 1998-10-27 | Rigaku/Usa, Inc. | Magnetic fluid sealing device |
| JP2004138138A (en) * | 2002-10-17 | 2004-05-13 | Nok Corp | Magnetic fluid sealing device |
| CN102537367A (en) * | 2012-01-12 | 2012-07-04 | 北京理工大学 | Shaft sealing device with magnetic fluids |
| CN105546123A (en) * | 2016-03-07 | 2016-05-04 | 广西科技大学 | Device and method for reducing eccentricity of rotating shaft of large-gap magnetic fluid sealing system |
| CN112212011A (en) * | 2020-10-30 | 2021-01-12 | 清华大学 | Magnetic liquid sealing device |
| US11092241B1 (en) * | 2020-10-30 | 2021-08-17 | Tsinghua University | Magnetic fluid sealing device |
| CN112728100A (en) * | 2020-12-28 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112728104A (en) * | 2020-12-31 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device with pole teeth filled with porous material |
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| CN114294424B (en) | 2022-06-03 |
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