CN112387225B - Composite magnetic medium sealing device for reaction kettle - Google Patents

Composite magnetic medium sealing device for reaction kettle Download PDF

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Publication number
CN112387225B
CN112387225B CN202011194216.8A CN202011194216A CN112387225B CN 112387225 B CN112387225 B CN 112387225B CN 202011194216 A CN202011194216 A CN 202011194216A CN 112387225 B CN112387225 B CN 112387225B
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shaft
pole shoes
pole
magnetic
bearing
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CN112387225A (en
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李德才
李倩
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Tsinghua University
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Tsinghua University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053Details of the reactor
    • B01J19/0073Sealings

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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

The invention discloses a composite magnetic medium sealing device for a reaction kettle, which comprises a shell, a shaft, a plurality of pole shoes, a magnetic source part, a first bearing, a second bearing and a pressure sensor, wherein the shell is provided with a cavity, the shaft is positioned in the cavity, the pole shoes are sleeved on the shaft and are spaced from the shaft in the radial direction of the shaft, a first gap is formed between one part of the pole shoes and the shaft in the radial direction of the shaft, a second gap is formed between the other part of the pole shoes and the shaft in the radial direction of the shaft, magnetic liquid is filled in the first gap, magnetic grease is filled in the second gap, the magnetic source part is positioned between the two adjacent pole shoes, the first bearing and the second bearing are arranged in the shell and are installed on the shaft, and one part of the pressure sensor extends into one part of the pole shoes. The composite magnetic medium sealing device for the reaction kettle has the advantages of high sealing performance, high pressure resistance, high temperature resistance and the like.

Description

Composite magnetic medium sealing device for reaction kettle
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a composite magnetic medium sealing device for a reaction kettle.
Background
Magnetic liquid seals are widely used due to their advantages of zero leakage, low friction, and long life, especially for vacuum low linear velocity rotary seals. Along with the improvement of the requirements of chemical plants on environmental protection and product quality, more and more reactions need to be carried out in a vacuum environment, and magnetic liquid sealing is more and more applied to the sealing of a reaction kettle and used for preventing air and the like from entering the reaction kettle to damage the vacuum environment, so that the high quality of products is ensured.
In the related art, the magnetic liquid used for sealing in the reaction vessel generally has the following problems; 1. the magnetic liquid seals the lubricant carried by the bearings and the like and the invalid small amount of magnetic liquid can drip into the reaction kettle, so that the product quality is influenced; 2. organic solvent vapor in the reaction kettle can damage the property of the magnetic liquid, so that the sealing performance is influenced, and the service life of the magnetic liquid seal is further influenced; 3. the sealing state cannot be monitored, and if the magnetic liquid sealing fails under the working conditions of high temperature and high pressure, no rescue measures are taken.
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 composite magnetic medium sealing device for a reaction kettle, which has the advantages of good heat resistance, pressure resistance, strong sealing performance, difficulty in polluting sealed substances, long service life and the like.
The composite magnetic medium sealing device for the reaction kettle comprises the following components: a housing having a chamber; a shaft rotatably extending through the housing, at least a portion of the shaft being located within the chamber; a plurality of pole shoes, the pole shoes are arranged in the cavity and sleeved on the shaft, the pole shoes are spaced from the shaft in the radial direction of the shaft, the pole shoes are arranged at intervals along the axial direction of the shaft, a part of the pole shoes and the shaft have a first gap in the radial direction of the shaft, another part of the pole shoes and the shaft have a second gap in the radial direction of the shaft, the first gap is filled with magnetic liquid, and the second gap is filled with magnetic grease; the magnetic source component can generate a magnetic field, is arranged in the cavity and is sleeved on the shaft, the pole shoes of one part and the pole shoes of the other part are arranged at intervals in the axial direction of the shaft, and the magnetic source component is positioned between two adjacent pole shoes; the first bearing and the second bearing are arranged in the shell and are installed on the shaft, the outer peripheries of the first bearing and the second bearing are in contact with the inner peripheral surface of the shell, and the first bearing is located between one part of the pole shoes and the other part of the pole shoes.
According to the composite magnetic medium sealing device for the reaction kettle, provided by the embodiment of the invention, the magnetic grease and the magnetic liquid are ingeniously combined in a sealing manner, so that the pressure resistance, the high temperature resistance and the sealing performance of the sealing device are effectively improved, lubricating liquid in the bearing is prevented from dropping into the reaction kettle or a reaction tank, the sealed medium is prevented from being polluted, and the service life of the composite magnetic medium sealing device for the reaction kettle is prolonged.
In some embodiments, the one part of the pole shoes comprises at least two first pole shoes arranged at intervals in the axial direction of the shaft, and/or the other part of the pole shoes comprises at least two second pole shoes arranged at intervals in the axial direction of the shaft.
In some embodiments, the composite magnetic media seal for a reaction vessel further comprises a pressure sensor disposed on the housing with a portion of the pressure sensor extending into the chamber and between adjacent ones of the portion of pole pieces.
In some embodiments, the housing is provided with a second through hole penetrating through the housing in a radial direction of the shaft, and the pressure sensor extends into the chamber through the second through hole.
In some embodiments, the magnetic source component includes a metal core having magnetic permeability and a coil wound around an outer periphery of the metal core.
In some embodiments, the composite magnetic medium sealing device for a reaction vessel further comprises a first sealing member provided in the first through hole between an inner wall surface of the through hole and one end of the coil and between an inner wall surface of the second through hole and an outer side surface of the force sensor.
In some embodiments, the composite magnetic media seal for a reaction vessel further comprises a magnetic liquid collector disposed at the first end of the shaft.
In some embodiments, the inner circumferential surface of the pole pieces is provided with a plurality of pole teeth arranged at intervals in an axial direction of the shaft, the first gap is formed between the pole teeth of the one portion of the pole pieces and the shaft, and the second gap is formed between the pole teeth of the other portion of the pole pieces and the shaft.
In some embodiments, the composite magnetic medium sealing device for the reaction kettle further comprises a plurality of magnetism isolating rings, a plurality of magnetism isolating rings are arranged in the shell and sleeved on the shaft, the plurality of magnetism isolating rings are arranged at intervals in the axial direction of the shaft, one magnetism isolating ring is located between the second bearing and one part of the pole shoes in the plurality of pole shoes, one magnetism isolating ring is located between the first bearing and the other part of the pole shoes in the plurality of pole shoes, and the rest magnetism isolating rings are respectively located between the first bearing and the second bearing; and the outer peripheral surface of the pole shoe is provided with an annular groove, the second sealing element is matched with the annular groove, and the outer peripheral surface of the sealing ring is attached to the inner peripheral surface of the shell.
Drawings
FIG. 1 is a schematic view of a first structure of the composite magnetic medium sealing device for a reaction kettle of the invention.
FIG. 2 is a schematic diagram of a second structure of the composite magnetic medium sealing device for a reaction kettle of the invention.
FIG. 3 is a schematic diagram of a third structure of the composite magnetic medium sealing device for a reaction kettle of the present invention.
FIG. 4 is a schematic diagram of a fourth structure of the composite magnetic medium sealing device for a reaction kettle of the present invention.
Reference numerals:
a composite magnetic medium sealing device 100 for a reaction kettle;
a housing 1; a chamber 11; a first through-hole 12; a second through hole 13;
a shaft 2;
a pole shoe 3; a magnetic liquid 31; magnetic grease 32; a first pole piece 33; a second pole piece 34; a pole tooth 35;
a magnetic source part 4; a metal core 41; a coil 42;
a magnetism isolating ring 5; a first magnetism isolating ring 51; a second magnetism isolating ring 52; a third magnetism isolating ring 53;
a first bearing 6;
a second bearing 7;
a second seal 8;
a pressure sensor 9;
a magnetic liquid collecting member 10; a permanent magnet 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 composite magnetic medium sealing apparatus 100 for a reaction vessel according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
As shown in fig. 1, a composite magnetic medium sealing device 100 for a reaction vessel according to an embodiment of the present invention includes a housing 1, a shaft 2, a plurality of pole pieces 3, a magnetic source member 4, a first bearing 6, and a second bearing 7.
The housing 1 has a chamber 11.
The shaft 2 is rotatably penetrated on the housing 1, and at least part of the shaft 2 is positioned in the chamber 11. Casing 1 accessible bolt is established on reation kettle's the cauldron body or on the cell body of stirred tank to seal the liquid in reation kettle or the stirred tank, axle 2 links to each other or axle 2 acts as the (mixing) shaft with reation kettle's (mixing) shaft or the (mixing) shaft of stirred tank, so that in reation kettle or the stirred tank by sealing medium reaction more abundant.
The pole shoes 3 are arranged in the cavity 11, the pole shoes 3 are sleeved on the shaft 2, the pole shoes 3 are spaced from the shaft 2 in the radial direction of the shaft 2, the pole shoes 3 are arranged at intervals in the axial direction (the up-down direction in fig. 1) of the shaft 2, a part of the pole shoes 3 and the shaft 2 have a first gap in the radial direction of the shaft 2, another part of the pole shoes 3 and the shaft 2 have a second gap in the radial direction of the shaft 2, one part of the pole shoes 3 and another part of the pole shoes 3 are arranged at intervals in the axial direction of the shaft 2, the first gap is smaller than the second gap, magnetic liquid 31 is arranged in the first gap, and magnetic grease 32 is arranged in the second gap.
The magnetic source part 4 can generate a magnetic field, the magnetic source part 4 is arranged in the cavity 11 and sleeved on the shaft 2, and one magnetic source part 4 is positioned between two adjacent pole shoes 3. The magnetic source part 4, the pole shoe 3 and the shaft 2 form a closed magnetic circuit, and a non-uniform magnetic field is generated in the first gap and the second gap by utilizing magnetic energy generated by the magnetic source part 4, so that the magnetic liquid 31 is adsorbed between the pole shoe 3 and the shaft 2, the magnetic grease 32 is adsorbed between the pole shoe 3 and the shaft 2, the magnetic liquid 31 is filled in the first gap, and the magnetic grease 32 is filled in the second gap, so that the sealing purpose is achieved.
The first bearing 6 and the second bearing 7 are arranged in the shell 1 and are installed on the shaft 2, the outer peripheries of the first bearing 6 and the second bearing 7 are in contact with the inner peripheral surface of the shell 1, and the first bearing 6 is located between one part of the pole shoes 3 in the plurality of pole shoes 3 and the other part of the pole shoes 3 in the plurality of pole shoes 3. Specifically, as shown in fig. 1, a first bearing 6 and a second bearing 7 are disposed on the shaft 2, the first bearing 6 is located below one part of the plurality of pole pieces 3 and above another part of the plurality of pole pieces 3, and the second bearing 7 is located above the plurality of pole pieces 3. The inner ring of first bearing 6 and the inner ring of second bearing 7 all with axle 2 interference fit, the outer lane of first bearing 6 and second bearing 7 all with the inner peripheral surface clearance or the transition fit of casing 1, not only can guarantee the smooth rotation of axle 2 in casing 1, when needs add magnetic fluid 31 in first clearance, add magnetic grease 32 in the second clearance or overhaul the spare part in the casing 1, also can make things convenient for first bearing 6 and second bearing 7 to take out along with axle 2 from casing 1.
According to the composite magnetic medium sealing device 100 for the reaction kettle, a second gap is formed between another part of the pole shoes 3 in the plurality of pole shoes 3 and the shaft 2 in the radial direction of the shaft 2, and magnetic grease 32 is arranged in the second gap. Because the magnetic grease 32 comprises the base carrier liquid which is lubricating grease, the magnetic grease 32 is in a solid structure, and the magnetic grease 32 can still have good sealing performance under the severe environment of high pressure and high temperature.
According to the composite magnetic medium sealing device 100 for the reaction kettle of the embodiment of the invention, one part of the pole shoes 3 and the other part of the pole shoes 3 are arranged at intervals in the axial direction of the shaft 2, specifically, as shown in fig. 1, the lower end of the shaft 2 is connected with a stirring shaft of the reaction kettle or a stirring shaft of a stirring tank, one part of the pole shoes 3 is arranged on the upper half section of the shaft 2, a magnetic liquid 31 is arranged between one part of the pole shoes 3 and the shaft 2, the other part of the pole shoes 3 is arranged on the lower half section of the shaft 2, and a magnetic grease 32 is arranged between the other part of the pole shoes 3 and the shaft 2. Therefore, when the sealed medium generates gas or generates heat, the pressure of the chamber 11 is increased, and as the magnetic grease 32 is arranged at the lower half section of the shaft 2, the pressure resistance and high temperature resistance are strong, and the sealing performance is good, the magnetic grease 32 is arranged at the lower half section of the shaft 2, so that the magnetic liquid 31 can be prevented from being damaged by the high-temperature gas or high-pressure gas penetrating through the magnetic grease 32, the service life of the magnetic liquid 31 is prolonged, and the composite magnetic medium sealing device 100 for the reaction kettle can still have good sealing performance in high-pressure and high-temperature environments.
According to the composite magnetic medium sealing device 100 for the reaction kettle, the first bearing 6 is located between one part of the pole shoes 3 and the other part of the pole shoes 3 in the plurality of pole shoes 3. Thereby preventing the lubricating liquid in the bearing from dropping into the reaction kettle or the reaction tank, preventing the sealed medium from being polluted by the lubricating oil, and further improving the sealing performance of the composite magnetic medium sealing device 100 for the reaction kettle.
The composite magnetic medium sealing device 100 for the reaction kettle according to the embodiment of the present invention,
therefore, the composite magnetic medium sealing device 100 for the reaction kettle according to the embodiment of the invention has the advantages of high pressure resistance and high temperature resistance, good sealing performance, long service life and the like.
It is worth mentioning that: the size of the first gap and the size of the second gap are not limited in the present invention, wherein the second gap may be selected according to a sealing gap sealed by the general magnetic liquid 31, and the second gap is larger than the first gap.
In some embodiments, one part of the pole shoes 3 comprises at least two first pole shoes 33, the at least two first pole shoes 33 being arranged at intervals in the axial direction of the shaft 2, and/or the other part of the pole shoes 3 comprises at least two second pole shoes 34, the at least two second pole shoes 34 being arranged at intervals in the axial direction of the shaft 2. The pole shoes 3 can be arranged according to actual needs, for example, as shown in fig. 2, one part of the pole shoes 3 includes three first pole shoes 33, the three first pole shoes 33 are arranged at intervals in the axial direction of the shaft 2, the magnetic liquid 31 is arranged between the three first pole shoes 33 and the shaft 2, the other part of the pole shoes 3 includes two second pole shoes 34, the second pole shoes 34 are arranged on the shaft 2 in a penetrating manner and are arranged below the three first pole shoes 33, and the magnetic grease 32 is arranged between the second pole shoes 34 and the shaft 2, so that the composite magnetic medium sealing device 100 for the reaction kettle is suitable for working conditions with low requirements on pressure and temperature, high requirements on sealing performance and high requirements on rotation torque.
Or, as shown in fig. 3, a part of the pole shoes 3 includes two first pole shoes 33, the two first pole shoes 33 are disposed on the shaft 2, the magnetic liquid 31 is disposed between the two first pole shoes 33 and the shaft 2, another part of the pole shoes 3 includes three second pole shoes 34, the three second pole shoes 34 are disposed below the first pole shoes 33, the three second pole shoes 34 are arranged at intervals in the axial direction of the shaft 2, and the magnetic grease 32 is disposed between the three second pole shoes 34 and the shaft 2, so that the composite magnetic medium sealing device 100 for a reaction kettle is suitable for working conditions with high requirements on pressure and temperature, low requirements on sealing performance, and low requirements on rotation torque.
Alternatively, as shown in fig. 4, one part of the pole shoes 3 includes three first pole shoes 33, the three first pole shoes 33 are arranged at intervals in the axial direction of the shaft 2, the magnetic liquid 31 is arranged between the three first pole shoes 33 and the shaft 2, the other part of the pole shoes 3 includes three second pole shoes 34, the three second pole shoes 34 are arranged below the three first pole shoes 33, the three second pole shoes 34 are arranged at intervals in the axial direction of the shaft 2, and the magnetic liquid 31 is arranged between the three second pole shoes 34 and the shaft 2, so that the composite magnetic medium sealing device 100 is suitable for working conditions with high requirements on pressure and temperature, low requirements on rotational torque, and high requirements on sealing performance.
It should be noted that the arrangement of the pole shoe 3 of the present invention is not limited to this, and for example: the plurality of first pole pieces 33 and the plurality of second pole pieces 34 are alternately arranged, and so on, which is not illustrated in this embodiment, and the operator can select the pole pieces according to actual needs.
In some embodiments, composite magnetic media seal 100 for a reaction vessel further comprises pressure sensor 9, pressure sensor 9 being disposed on housing 1, and pressure sensor 9 extending partially into chamber 11 and being located between adjacent pole pieces 3 of a portion of pole pieces 3. The pressure sensor 9 can detect the pressure in the cavity 11 between the two pole shoes 3, when the sealing performance of the magnetic liquid 31 between one part of the pole shoes 3 and the shaft 2 is good, the reading of the pressure sensor 9 will not change obviously, and when the magnetic liquid 31 between one part of the pole shoes 3 and the shaft 2 fails, the reading of the pressure sensor 9 will increase, so as to remind a user that the magnetic liquid 31 fails, and remind the user to replace the magnetic liquid 31 in time. Specifically, as shown in fig. 1, a part of the pole pieces 3 includes six first pole pieces 33, wherein 3 of the first pole pieces 33 and the magnetic source part 4 disposed between adjacent two of the first pole pieces 33 form one complete first unit, the other 3 first pole pieces 33 and the magnetic source part 4 arranged between the two adjacent second pole pieces 34 form a complete second unit, the first unit is arranged below the second unit, one magnetism isolating ring 5 is arranged between the first unit and the second unit, which not only facilitates the installation and the disassembly of the first unit, the magnetism isolating ring 5 and the second unit, but also enables the magnetism isolating ring 5 to separate the first unit from the second unit, due to the ability of the magnetism isolating ring 5 to block the magnetic field, the magnetic force lines in the first unit are prevented from penetrating into the first pole shoe 33 of the second unit, or the magnetic force lines in the second unit are prevented from penetrating into the first pole shoe 33 of the first unit. The pressure sensor 9 penetrates through the shell 1 and the magnetism isolating ring 5 to extend into the cavity 11, the detection end of the pressure sensor 9 is arranged between the first unit and the second unit, when the reading of the pressure sensor 9 changes, the first unit is arranged below the second unit, so that the first unit is damaged by a sealed medium in the reaction kettle, the magnetic liquid 31 in the first unit fails, a user is reminded to replace the magnetic liquid 31 in the first unit, and the magnetic liquid 31 of the second unit still has sealing performance, so that the composite magnetic medium sealing device 100 for the reaction kettle still has good sealing performance, and whether the first unit is sealed well or not is detected.
In some embodiments, the magnetic source component 4 includes a metal core 41 with magnetic permeability and a coil 42, and the coil 42 is wound around the outer periphery of the metal core 41. Thus, when the coil 42 is energized, the metal core 41 will be magnetized, so that the magnetic source component 4 generates a magnetic field, and the magnitude of the magnetic field generated by the magnetic source component 4 will be adjusted by adjusting the magnitude 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 component 4 is reduced, the magnetic field in the first gap and the magnetic field in the second gap can be reduced, the starting torque of the shaft 2 is reduced, and the required power for starting the rotation of the shaft 2 can be reduced; when the sealing device works normally, the current can be increased, so that the magnetic field in the gap is increased, the pressure resistance is increased, and the pressure resistance of the composite magnetic medium sealing device 100 for the reaction kettle is adjusted by adjusting the current.
The magnetic source unit 4 is not limited to the above-described forms of the metal core 41 and the coil 42, and for example, in other embodiments, the electromagnetic device includes a permanent magnet (not shown in the drawings). Thereby being capable of directly generating a magnetic field on the permanent magnet and being convenient to use.
Alternatively, the material of the metal core 41 may be a silicon steel sheet or an electrical pure iron, and since the silicon steel and the electrical pure iron have good magnetic permeability, the metal core 41 made of the silicon steel or the electrical pure iron can increase the magnetic field strength of the magnetic source part 4.
It should be noted that the strength of the current flowing into the coil 42, the number of turns of the coil 42 and the spiral direction are not limited in the present invention, and can be selected by those skilled in the art according to actual situations.
In some embodiments, the housing 1 is provided with a first through hole 12 penetrating the housing 1 in a radial direction of the shaft 2, and one end of the coil 42 is connected to an external power supply (not shown) through the first through hole 12. Specifically, as shown in fig. 1, a through hole penetrating through the housing 1 along the radial direction of the shaft 2 is formed in a portion of the housing 1 where the magnetic source component 4 is located, so that the coil 42 of the magnetic source component 4 can conveniently penetrate through the through hole to be connected with an external power-on device, and the configuration of the housing 1 is more reasonable.
In some embodiments, the housing 1 is provided with a second through hole 13 penetrating the housing 1 in the radial direction of the shaft 2, and the pressure sensor 9 protrudes into the chamber 11 through the second through hole 13. Specifically, as shown in fig. 1, the second through hole 13 is provided on the opposite side of the first through hole 12, thereby facilitating the installation of the pressure sensor 9, further making the arrangement of the structure of the housing 1 more reasonable.
In some embodiments, the composite magnetic medium sealing device 100 for a reaction vessel further includes first sealing members (not shown in the drawings) provided in the first through hole 12 between an inner wall surface of the through hole and one end of the coil 42 and between an inner wall surface of the second through hole 13 and an outer side surface of the force sensor. That is, the first sealing member is filled in the first through hole 12 and the second through hole 13, so that the first sealing member blocks the first through hole 12 and the second through hole 13, thereby preventing the sealed medium from leaking to the external environment through the first through hole 12 and the second through hole 13, and further enhancing the sealing performance of the composite magnetic medium sealing device 100 for a reaction vessel.
Optionally, the first sealing element is a sealant, and the sealant can be conveniently filled in the first through hole 12 and the second through hole 13, so as to ensure the sealing performance of the composite magnetic medium sealing device 100 for the reaction kettle.
In some embodiments, the composite magnetic media seal 100 for a reaction vessel further comprises a magnetic liquid collector 10, the magnetic liquid collector 10 being provided at the first end of the shaft 2 (the lower end of the shaft 2). Specifically, as shown in fig. 1, the magnetic liquid collector 10 is fixed on the shaft 2 and disposed below the second pole piece 34, and due to the limited high temperature resistance of the magnetic grease 32, when the temperature is higher than the melting point of the magnetic grease 32, the magnetic grease 32 will be changed from solid to liquid, the magnetic grease 32 will be damaged by the high temperature and high pressure generated in the reaction kettle and the reaction tank, the magnetic grease 32 will flow out of the second gap, and the grease drops fall into the reaction kettle or the reaction tank under the action of gravity, so that the magnetic grease 32 will drop into the magnetic liquid collector 10, thereby preventing the magnetic grease 32 from polluting the sealed medium.
Alternatively, a permanent magnet 101 may be placed in the magnetic liquid collecting member 10, the permanent magnet 101 magnetizes the magnetic liquid collecting member 10, and the magnetic grease 32 may be adsorbed in the magnetized magnetic liquid collecting member 10 due to the presence of the magnetic particles in the magnetic grease 32.
In some embodiments, the inner circumferential surface of the pole piece 3 is provided with a plurality of pole teeth 35, the plurality of pole teeth 35 are arranged at intervals along the axial direction of the shaft 2, a first gap is formed between the pole teeth 35 of one part of the pole piece 3 and the shaft 2, and a second gap is formed between the pole teeth 35 of the other part of the pole piece 3 and the shaft 2. Because the pole teeth 35 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 35, so that the magnetic grease 32 and the magnetic liquid 31 can be more firmly adsorbed between the pole shoe 3 and the shaft 2, and the sealing effect of the composite magnetic medium sealing device 100 for the reaction kettle is further improved.
In some embodiments, the composite magnetic medium sealing device 100 for a reaction kettle further includes a plurality of magnetism isolating rings 5 disposed in the housing 1 and sleeved on the shaft 2, the plurality of magnetism isolating rings 5 are arranged at intervals in an axial direction of the shaft 2, one magnetism isolating ring 5 is located between the second bearing 7 and a part of the pole shoes 3 in the plurality of pole shoes 3, one magnetism isolating ring 5 is located between the first bearing 6 and another part of the pole shoes 3 in the plurality of pole shoes 3, and the rest magnetism isolating rings 5 are respectively located between the first bearing 6 and the second bearing 7. Specifically, as shown in fig. 1, the plurality of magnetism isolating rings 5 include a first magnetism isolating ring 51, a second magnetism isolating ring 52 and a third magnetism isolating ring 53, the first magnetism isolating ring 51 is disposed between the plurality of first pole shoes 33 and the second bearing 7, and the second magnetism isolating ring 52 and the third magnetism isolating ring 53 are disposed on the upper and lower sides of the first bearing 6, respectively. Therefore, the magnetic force lines generated by the magnetic source part 4 are prevented from leaking into the first bearing 6 and the second bearing 7 from the left and right sides of the pole shoes 3, and the sealing effect of the composite magnetic medium sealing device 100 for the reaction kettle is further improved.
In some embodiments, the composite magnetic medium sealing device 100 for a reaction kettle further comprises a second sealing member 8, an annular groove is formed in the outer peripheral surface of the pole piece 3, the second sealing member 8 is fitted in the annular groove, and the outer peripheral surface of the second sealing member 8 is attached to the inner peripheral surface of the shell 1. According to the composite magnetic medium sealing device 100 for the reaction kettle of the embodiment of the invention, the annular groove is provided with the second sealing member 8, so that the sealed medium is prevented from leaking to the external environment from the gap between the outer peripheral surface of the pole piece 3 and the inner peripheral surface of the shell 1, and the sealing performance of the composite magnetic medium sealing device 100 for the reaction kettle is further ensured.
A composite magnetic media seal 100 according to some specific examples of the invention is described below with reference to fig. 1.
A composite magnetic media seal 100 according to a specific example of the invention includes: the magnetic field sensor comprises a shell 1, a shaft 2, six first pole shoes 33, two second pole shoes 34, a magnetic source part 4, a pressure sensor 9, a first magnetism isolating ring 51, a second magnetism isolating ring 52, a third magnetism isolating ring 53, a first bearing 6 and a second bearing 7.
The shell 1 is provided with a cavity 11, the shaft 2 can rotatably penetrate through the shell 1, the first pole shoes 33 and the second pole shoes 34 are arranged in the cavity 11, the first pole shoes 33 and the second pole shoes 34 are sleeved on the shaft 2, six first pole shoes 33 are arranged above the two second pole shoes 34, the inner circumferential surfaces of each first pole shoe 33 and each second pole shoe 34 are provided with pole teeth 35, the first pole shoes 33 and the shaft 2 have first gaps in the radial direction of the shaft 2, the second pole shoes 34 have second gaps in the radial direction of the shaft 2, the first gaps are internally provided with magnetic liquid 31, and the second gaps are internally provided with magnetic grease 32. The outer peripheral surface of each first pole piece 33 and the outer peripheral surface of each second pole piece 34 are provided with annular grooves, second sealing elements 8 are arranged in the annular grooves, and the outer peripheral surfaces of the second sealing elements 8 are attached to the inner peripheral surface of the shell 1.
The magnetic source unit 4 includes a metal core 41 having magnetic permeability and a coil 42, and the coil 42 is wound around the outer periphery of the metal core 41. The position of the shell 1 where the magnetic source component 4 is located is provided with a first through hole 12 and a second through hole 13 which penetrate through the shell 1 along the radial direction of the shaft 2, the coil 42 of the magnetic source component 4 penetrates through the first through hole 12 to be connected with an external electrifying device, and sealant is arranged in the first through hole 12, so that the sealing performance of the composite magnetic medium sealing device 100 is ensured. A pressure sensor 9 is arranged in the second through hole 13, a detection end of the pressure sensor 9 extends into the cavity 11 of the shell 1, and the detection end is arranged between the six first pole shoes 33. A magnetic source part 4 is arranged between two adjacent first pole shoes 33, a magnetic source part 4 is arranged between two adjacent second pole shoes 34, first magnetism isolating rings 51 are arranged on the upper sides of the six first pole shoes 33, second magnetism isolating rings 52 are arranged on the lower sides of the six first pole shoes 33, and third magnetism isolating rings 53 are arranged on the upper sides of the two second pole shoes 34.
The first bearing 6 and the second bearing 7 are arranged in the cavity 11 and are arranged on the shaft 2, the first bearing 6 is arranged above the first magnetism isolating ring 51, and the second bearing 7 is arranged between the second magnetism isolating ring 52 and the third magnetism isolating ring 53, so that magnetic lines of force generated by the magnetic source part 4 are prevented from entering the first bearing 6 or the second bearing 7, and the sealing effect of the composite magnetic medium sealing device 100 is improved.
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," "specific examples," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (9)

1. A composite magnetic media seal for a reaction vessel, 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;
a plurality of pole shoes disposed in the chamber and fitted over the shaft, the pole shoes being spaced apart from the shaft in a radial direction of the shaft, the plurality of pole shoes being spaced apart in an axial direction of the shaft, a portion of the plurality of pole shoes having a first gap in the radial direction of the shaft with the shaft, another portion of the plurality of pole shoes having a second gap in the radial direction of the shaft with the shaft, the portion of the pole shoes and the another portion of the pole shoes being spaced apart in the axial direction of the shaft, the first gap being smaller than the second gap, the first gap being filled with a magnetic liquid, the second gap being filled with a magnetic grease, the portion of the pole shoes and the another portion of the pole shoes being alternately disposed on the shaft such that the magnetic liquid and the magnetic grease are alternately disposed on the shaft;
the magnetic source component can generate a magnetic field, is arranged in the cavity and sleeved on the shaft, and is positioned between two adjacent pole shoes;
the first bearing and the second bearing are arranged in the cavity, the first bearing and the second bearing are respectively sleeved on the shaft, the outer peripheries of the first bearing and the second bearing are in contact with the inner circumferential surface of the shell, the first bearing is positioned between one part of pole shoes and the other part of pole shoes, and the second bearing is positioned above the pole shoes;
the magnetic liquid collecting piece is arranged at the first end part of the shaft.
2. The composite magnetic media seal for a reactor vessel of claim 1, wherein said one portion of pole pieces includes at least two first pole pieces spaced axially from said shaft, and/or said another portion of pole pieces includes at least two second pole pieces spaced axially from said shaft.
3. The composite magnetic media seal for a reactor vessel of claim 1, further comprising a pressure sensor disposed on said housing, a portion of said pressure sensor extending into said chamber and being located between adjacent ones of said pole pieces.
4. The composite magnetic medium sealing device for the reaction kettle as claimed in claim 3, wherein a second through hole penetrating through the housing along a radial direction of the shaft is provided on the housing, and the pressure sensor extends into the chamber through the second through hole.
5. The composite magnetic media seal for a reaction vessel of claim 4, wherein the magnetic source component is a magnetic source component comprising a metal core having magnetic permeability and a coil wound around an outer periphery of the metal core.
6. The composite magnetic medium sealing device for the reaction kettle as claimed in claim 5, wherein a first through hole penetrating through the housing along a radial direction of the shaft is provided on the housing, and one end of the coil is connected with an external electrifying device through the first through hole.
7. The composite magnetic medium sealing device for the reaction kettle according to claim 6, further comprising a first sealing member provided in the first through hole between an inner wall surface of the first through hole and one end of the coil and between an inner wall surface of the second through hole and an outer side surface of the pressure sensor.
8. The composite magnetic media seal for a reactor vessel of claim 1, wherein the inner circumferential surface of said pole pieces is provided with a plurality of pole teeth spaced axially along said shaft, said first gap being formed between said pole teeth of said one portion of said pole pieces and said shaft, and said second gap being formed between said pole teeth of said another portion of said pole pieces and said shaft.
9. The composite magnetic medium sealing device for the reaction kettle as claimed in claim 1, further comprising a plurality of magnetism isolating rings disposed in the housing and sleeved on the shaft, wherein the plurality of magnetism isolating rings are arranged at intervals in an axial direction of the shaft, one magnetism isolating ring is located between the second bearing and the part of the pole shoes, another magnetism isolating ring is located between the first bearing and the other part of the pole shoes, and a part of the rest magnetism isolating rings is located between the first bearing and the second bearing;
and the outer peripheral surface of the pole shoe is provided with an annular groove, the second sealing piece is matched with the annular groove, and the outer peripheral surface of the second sealing piece is attached to the inner peripheral surface of the shell.
CN202011194216.8A 2020-10-30 2020-10-30 Composite magnetic medium sealing device for reaction kettle Active CN112387225B (en)

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CN103925370A (en) * 2014-04-29 2014-07-16 北京交通大学 Magnetic liquid sealing device using magnetic grease
CN209041569U (en) * 2018-09-11 2019-06-28 无锡全世全流体科技有限公司 A kind of cryogenic pump combination sealing arrangement
CN210068945U (en) * 2018-12-14 2020-02-14 北京交通大学 Novel magnetorheological suspensions seal structure
CN111577649A (en) * 2020-05-11 2020-08-25 山东省章丘鼓风机股份有限公司 Magnetic fluid sealing device for slurry pump

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CN110762224A (en) * 2019-11-25 2020-02-07 广西科技大学 Divergent split-tooth stepped magnetic fluid rotary sealing device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11103553A (en) * 1997-09-29 1999-04-13 Tdk Corp Motor with magnetic fluid seal
CN1834505A (en) * 2006-04-18 2006-09-20 北京交通大学 Sealing anti-drip device of high temp magnetic liquid
CN103925370A (en) * 2014-04-29 2014-07-16 北京交通大学 Magnetic liquid sealing device using magnetic grease
CN209041569U (en) * 2018-09-11 2019-06-28 无锡全世全流体科技有限公司 A kind of cryogenic pump combination sealing arrangement
CN210068945U (en) * 2018-12-14 2020-02-14 北京交通大学 Novel magnetorheological suspensions seal structure
CN111577649A (en) * 2020-05-11 2020-08-25 山东省章丘鼓风机股份有限公司 Magnetic fluid sealing device for slurry pump

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