CN112161065A

CN112161065A - Magnetic Liquid Seals for Stirrers

Info

Publication number: CN112161065A
Application number: CN202011194176.7A
Authority: CN
Inventors: 李德才; 孙睿; 李倩
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-01-01
Anticipated expiration: 2040-10-30
Also published as: CN112161065B

Abstract

The invention discloses a magnetic liquid sealing device for a stirrer, which comprises a shell, a shaft part, a first magnetic liquid sealing component and a second magnetic liquid sealing component, wherein a cavity is arranged in the shell, the shaft part is arranged on the shell in a penetrating way and can rotate relative to the shell, an annular bulge is arranged on the periphery of the shaft part and arranged in the cavity, the first magnetic liquid sealing component and the second magnetic liquid sealing component are respectively sleeved on the shaft part and are arranged at intervals in the axial direction of the shaft part, the annular bulge is positioned between the first magnetic liquid sealing component and the second magnetic liquid sealing component, the first magnetic liquid sealing component and the annular bulge have a first sealing gap in the axial direction of the shaft part, and the second magnetic liquid sealing component and the annular bulge have a second sealing gap in the axial direction of the shaft part Collision occurs, and the service life is prolonged.

Description

Magnetic liquid sealing device for stirrer

Technical Field

The invention relates to the technical field of liquid sealing, in particular to a magnetic liquid sealing device for a stirrer.

Background

The agitator has extensive application in fields such as petrochemical, in order to prevent to be sealed medium leakage, realizes green production, environmental protection to it is internal to prevent that outside air from getting into the agitator tank, often can adopt magnetic fluid to seal. In order to ensure high pressure resistance, the sealing gap between the pole teeth and the shaft in the magnetic liquid seal is usually between 0.1 mm and 0.3 mm. However, the stirrer can generate violent radial run-out in the high-speed rotating process, so that the bearing of the traditional magnetic liquid seal is damaged, and the pole teeth and the shaft are rubbed to fail and leak. In the related technology, the mode of auxiliary sealing of the corrugated pipe is adopted, so that the collision, abrasion and damage of radial runout to the magnetic liquid sealing teeth in the working process of the stirrer are reduced. However, the auxiliary sealing structure of the corrugated pipe is complex, and the installation rigidity of the whole structure is affected by the auxiliary sealing structure, so that the stability of the auxiliary sealing structure of the corrugated pipe is affected.

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 for a stirrer, which can avoid collision with a pole shoe when a shaft part radially jumps without reducing the structural rigidity, and prolong the service life.

The magnetic liquid sealing device for the stirrer comprises a shell, wherein a chamber is arranged in the shell; the shaft part is arranged on the shell in a penetrating mode and can rotate relative to the shell, at least part of the shaft part is located in the cavity, an annular bulge is arranged on the periphery of the shaft part, and the annular bulge is located in the cavity; the first magnetic liquid sealing assembly and the second magnetic liquid sealing assembly are respectively sleeved on the shaft component, the first magnetic liquid sealing assembly and the second magnetic liquid sealing assembly are arranged at intervals in the axial direction of the shaft component, the annular protrusion is located between the first magnetic liquid sealing assembly and the second magnetic liquid sealing assembly, the first magnetic liquid sealing assembly and the annular protrusion have a first sealing gap in the axial direction of the shaft component, magnetic liquid is adsorbed in the first sealing gap, the second magnetic liquid sealing assembly and the annular protrusion have a second sealing gap in the axial direction of the shaft component, and magnetic liquid is adsorbed in the second sealing gap; an end cap coupled to the housing, the end cap configured to seal the chamber, one end of the shaft member passing through the end cap; a seal disposed between the end cap and the housing.

In some embodiments, the shaft member includes a shaft at least partially rotatably disposed within the chamber, and the annular projection is disposed on an outer periphery of the shaft.

In some embodiments, the shaft member includes a rotating shaft and a shaft sleeve, the rotating shaft is disposed on the housing and rotatable relative to the housing, at least a portion of the rotating shaft is located in the cavity, the shaft sleeve is disposed on the rotating shaft, at least a portion of the shaft sleeve is located in the cavity, and the annular protrusion is disposed on an outer periphery of the shaft sleeve.

In some embodiments, the shaft sleeve is provided with a plurality of mounting holes, the mounting holes penetrate through the shaft sleeve in the radial direction of the rotating shaft, the magnetic liquid sealing device for the stirrer further comprises a plurality of stopping pieces, the plurality of stopping pieces correspond to the plurality of mounting holes one to one, the stopping pieces are arranged in the mounting holes, and the stopping pieces are used for fixing the shaft sleeve.

In some embodiments, the first magnetic liquid sealing assembly includes a first fixing member, a plurality of first pole shoes, and first permanent magnets, the first fixing member is sleeved on the shaft member, an outer circumference of the first fixing member contacts an inner wall of the housing, the plurality of first pole shoes and the first permanent magnets are both disposed between the first fixing member and the annular protrusion, the plurality of first pole shoes are arranged at intervals in a radial direction of the shaft member, the first sealing gap is formed between the first pole shoes and the annular protrusion, the first permanent magnets are disposed between adjacent first pole shoes, the second magnetic liquid sealing assembly includes a second fixing member, a plurality of second pole shoes, and second permanent magnets, the second fixing member is sleeved on the shaft member, an outer circumference of the second fixing member contacts an inner wall of the housing, the plurality of second pole shoes and the second permanent magnets are both disposed between the second fixing member and the annular protrusion, the second pole shoes are arranged at intervals in the radial direction of the shaft component, the second sealing gap is formed between the second pole shoes and the annular bulge, and the second permanent magnet is arranged between the adjacent second pole shoes.

In some embodiments, a plurality of the first pole pieces and a plurality of the second pole pieces are oppositely disposed in an axial direction of the shaft member.

In some embodiments, the magnetic liquid sealing device for a stirrer further comprises a first sealing gasket and a second sealing gasket, the first sealing gasket is arranged between the first pole shoe and the first fixing piece, and the second sealing gasket is arranged between the second pole shoe and the second fixing piece.

In some embodiments, the first fixing member is provided with a plurality of first through holes, the plurality of first through holes penetrate through the first fixing member in the axial direction of the shaft member, the magnetic liquid sealing device for a stirrer further comprises a plurality of first adjusting pieces, the plurality of first adjusting pieces are in one-to-one correspondence with the plurality of first through holes, the first adjusting pieces are arranged in the first through holes, and one end of each first adjusting piece is connected with the first pole piece; the magnetic liquid sealing device for the stirrer further comprises a plurality of second adjusting pieces, the second adjusting pieces are in one-to-one correspondence with the second through holes, the second adjusting pieces are arranged in the second through holes, and one ends of the second adjusting pieces are connected with the second pole shoe.

In some embodiments, the magnetic liquid sealing device for a stirrer further comprises an isolation sleeve, the isolation sleeve is arranged in the cavity, the outer periphery of the isolation sleeve is in contact with the inner wall of the shell, the isolation sleeve is arranged between the first fixing piece and the second fixing piece, the shaft part penetrates through the isolation sleeve, and the isolation sleeve and the outer periphery of the annular protrusion have a preset gap in the radial direction of the shaft part.

In some embodiments, the first fixing member and the second fixing member have grooves on their outer peripheral surfaces, and the magnetic liquid sealing device for a stirrer further includes a first sealing ring and a second sealing ring, the first sealing ring is disposed in the groove of the first fixing member, and the second sealing ring is disposed in the groove of the second fixing member.

Compared with the prior art, the magnetic liquid sealing device for the stirrer provided by the embodiment of the invention has the following beneficial effects:

1. under the condition that the structural rigidity is not reduced, the collision between the shaft part and the pole shoe during radial runout is avoided, and the service life is prolonged.

2. The sealing failure caused by the sliding of the shaft sleeve in the left and right directions can be avoided, and the sealing stability is improved.

3. The size of the first sealing gap and the size of the second sealing gap in the axial direction of the shaft part can be adjusted, and the sealing requirements of different sealing media are met.

Drawings

Fig. 1 is a schematic structural view of a magnetic liquid sealing apparatus for a stirrer according to an embodiment of the present invention.

FIG. 2 is a schematic structural view of a magnetic liquid sealing device for a stirrer according to another embodiment of the present invention

Fig. 3 is a schematic structural diagram of a first fixing member in a magnetic liquid sealing device for a stirrer according to an embodiment of the present invention.

Reference numerals:

housing 1, chamber 101, flange 102

The shaft member 2, the rotating shaft 21, the sleeve 22, the mounting hole 221, the annular projection 23,

a first magnetic liquid seal assembly 3, a first fixing member 31, a first through hole 311, a first pole piece 32, a first permanent magnet 33,

a second magnetic liquid seal assembly 4, a second fixing member 41, a second through hole 411, a second pole piece 42, a second permanent magnet 43,

the sealing device comprises a first sealing gasket 5, a second sealing gasket 6, a first adjusting piece 7, a second adjusting piece 8, an isolating sleeve 9, a first sealing ring 10, a second sealing ring 11, an end cover 12, a sealing piece 13 and a stop piece 14.

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 to 3, the magnetic liquid seal device for a stirrer according to the embodiment of the present invention includes a housing 1, a shaft member 2, a first magnetic liquid seal assembly 3, and a second magnetic liquid seal assembly 4.

The housing 1 has a chamber 101 therein. As shown in fig. 1, a flange portion 102 is disposed at the left end of the housing 11, a plurality of threaded holes are disposed on the flange portion 102, the flange portion 102 is suitable for being connected to an external device, a groove is further disposed at the left end of the housing 1, and a sealing ring is disposed in the groove.

The shaft part 2 is arranged on the shell 1 in a penetrating mode and can rotate relative to the shell 1, at least part of the shaft part 2 is located in the cavity 101, the outer periphery of the shaft part 2 is provided with an annular protrusion 23, and the annular protrusion 23 is located in the cavity 101. As shown in fig. 1, the shaft member 2 horizontally penetrates the housing 1 in the left-right direction, and the left and right sides of the rotating shaft 21 protrude out of the housing 1, with a predetermined interval in the up-down direction between the outer periphery of the annular protrusion 23 and the inner wall of the housing 1.

The first magnetic liquid seal assembly 3 and the second magnetic liquid seal assembly 4 are respectively sleeved on the shaft member 2, the first magnetic liquid seal assembly 3 and the second magnetic liquid seal assembly 4 are arranged in an axial direction (left and right direction as shown in fig. 1) of the shaft member 2 at intervals, the annular protrusion 23 is arranged between the first magnetic liquid seal assembly 3 and the second magnetic liquid seal assembly 4, the first magnetic liquid seal assembly 3 and the annular protrusion 23 have a first seal gap in the axial direction of the shaft member 2, magnetic liquid is adsorbed in the first seal gap, the second magnetic liquid seal assembly 4 and the annular protrusion 23 have a second seal gap in the axial direction of the shaft member 2, and magnetic liquid is adsorbed in the second seal gap.

According to the magnetic liquid sealing device for the stirrer, the first magnetic liquid sealing element and the second magnetic liquid sealing element respectively form the first sealing gap and the second sealing gap with the annular bulge 23 in the left-right direction, so that the collision between a shaft component and a pole shoe during radial runout can be avoided under the condition of not reducing the structural rigidity, and the service life is prolonged.

In some embodiments, the shaft member 2 includes a shaft 21, the shaft 21 being at least partially rotatably disposed within the chamber 101, and the annular projection 23 being disposed on an outer periphery of the shaft 21. As shown in fig. 2, the annular protrusion 23 is of an integral structure with the rotation shaft 21.

In some embodiments, the shaft member 2 includes a rotating shaft 21 and a shaft sleeve 22, the rotating shaft 21 is disposed on the housing 1 and is rotatable relative to the housing 1, at least a portion of the rotating shaft 21 is located in the cavity 101, the shaft sleeve 22 is disposed on the rotating shaft 21, the shaft sleeve 22 is at least partially located in the cavity 101, and the annular protrusion 23 is disposed on an outer periphery of the shaft sleeve 22. As shown in fig. 1, the annular protrusion 23 and the shaft sleeve 22 are of an integral structure, an inner circumferential surface of the shaft sleeve 22 contacts with an outer circumferential surface of the rotating shaft 21, a plurality of sealing rings are arranged between the shaft sleeve 22 and the rotating shaft 21, the plurality of sealing rings are respectively sleeved on the rotating shaft 21, and the plurality of sealing rings are arranged at intervals in the left-right direction. The material of the shaft sleeve 22 is magnetic conductive material, and the specific material of the shaft sleeve 22 is 2Cr13, it is to be understood that the material of the shaft sleeve 22 in the present application is not limited thereto, and may also be 1Cr13, for example.

In some embodiments, the shaft sleeve 22 is provided with a plurality of mounting holes 221, the mounting holes 221 penetrate the shaft sleeve 22 in a radial direction of the rotating shaft 21, the magnetic liquid sealing device for a stirrer further comprises a plurality of stopping members 14, the plurality of stopping members 14 correspond to the plurality of mounting holes 221 one by one, the stopping members 14 are provided in the mounting holes 221, and the stopping members 14 are used for fixing the shaft sleeve 22. The stopper 14 in the embodiment of the present invention is a stopper screw.

According to the magnetic liquid sealing device for the stirrer, provided by the embodiment of the invention, the plurality of the stop pieces 14 are arranged, so that the shaft sleeve 22 can be fixed and positioned, the sealing failure caused by the sliding of the shaft sleeve 22 in the left and right directions is avoided, and the sealing stability is improved.

In some embodiments, the first magnetic liquid seal assembly 3 includes a first fixing member 31, a plurality of first pole pieces 32, and first permanent magnets 33, the first fixing member 31 is disposed on the shaft member 2, an outer circumference of the first fixing member 31 contacts an inner wall of the housing 1, the plurality of first pole pieces 32 and the first permanent magnets 33 are disposed between the first fixing member 31 and the annular protrusion 23, the plurality of first pole pieces 32 are spaced apart in a radial direction (an up-down direction shown in fig. 1) of the shaft member 2, a first seal gap is formed between the first pole pieces 32 and the annular protrusion 23, and the first permanent magnets 33 are disposed between adjacent first pole pieces 32.

As shown in fig. 1, the left end surface of the first fixing member 31 contacts the inner wall of the housing 1, and a predetermined gap is provided between the inner circumference of the first fixing member 31 and the boss 22 in the vertical direction. As shown in fig. 1 and 2, there are three first pole pieces 32, the three first pole pieces 32 are respectively connected to the first fixing member 31, the three first pole pieces 32 are arranged at intervals in the up-down direction, and a first permanent magnet 33 is disposed between two adjacent first pole pieces 32. It will be appreciated that the number of first pole pieces 32 is not limited thereto.

The second magnetic liquid sealing assembly 4 includes a second fixing member 41, a plurality of second pole shoes 42 and second permanent magnets 43, the second fixing member 41 is sleeved on the shaft member 2, the outer circumference of the second fixing member 41 contacts with the inner wall of the housing 1, the plurality of second pole shoes 42 and the second permanent magnets 43 are both disposed between the second fixing member 41 and the annular protrusion 23, the plurality of second pole shoes 42 are spaced apart in the radial direction of the shaft member 2, a second sealing gap is formed between the second pole shoes 42 and the annular protrusion 23, and the second permanent magnets 43 are disposed between the adjacent second pole shoes 42.

As shown in fig. 1 and 2, the dimension of the second fixing member 41 in the left-right direction is equal to the dimension of the first fixing member 31 in the left-right direction, and the dimension of the first fixing member 31 in the up-down direction is equal to the dimension of the second fixing member 41 in the up-down direction. A predetermined gap is provided between the inner periphery of the second fixed member 41 and the boss 22 in the up-down direction.

As shown in fig. 1 and 2, there are three second pole pieces 42, the three second pole pieces 42 are respectively connected to the second fixing member 41, the three second pole pieces 42 are arranged at intervals in the vertical direction, and a second permanent magnet 43 is disposed between two adjacent second pole pieces 42. It will be appreciated that the number of second pole pieces 42 is not limited thereto.

In some embodiments, the plurality of first pole pieces 32 and the plurality of second pole pieces 42 are arranged opposite to each other in the axial direction of the shaft member 2. As shown in fig. 1 and 2, the first and

second pole pieces

32 and 42 are oppositely disposed in the left-right direction, and the first and

second pole pieces

32 and 42 are equal in size.

In some embodiments, the magnetic liquid sealing device for a stirrer further includes a first sealing gasket 5 and a second sealing gasket 6, the first sealing gasket 5 is disposed between the first pole piece 32 and the first fixing piece 31, and the second sealing gasket 6 is disposed between the second pole piece 42 and the second fixing piece 41.

As shown in fig. 1 and 2, the left end surface of the first seal 5 is in contact with the right end surface of the first fixing member 31, the outer peripheral surface of the first seal 5 is substantially flush with the outer peripheral surface of the outermost one of the plurality of first pole pieces 32, and the inner peripheral surface of the first seal 5 is substantially flush with the inner peripheral surface of the innermost one of the plurality of first pole pieces 32. The right end surface of the second seal 6 is in contact with the left end surface of the second fixing member 41, the outer peripheral surface of the second seal 6 is substantially flush with the outer peripheral surface of the outermost one of the second pole pieces 42, and the inner peripheral surface of the second seal 6 is substantially flush with the inner peripheral surface of the innermost one of the second pole pieces 42.

According to the magnetic liquid sealing device for the stirrer, provided by the embodiment of the invention, the first sealing gasket 5 is arranged, so that the magnetic liquid and the sealing medium can be prevented from leaking between the first pole shoe 32 and the first fixing piece 31, the sealing property and the compressive strength are improved, and the size of the first sealing gap in the left-right direction can be adjusted by changing the thickness of the first sealing gasket 5, so that the sealing requirements of different sealing media are met. Through setting up second sealed 6 of filling up, can avoid magnetic fluid and sealing medium to leak by between second pole shoe 42 and the second mounting 41, improve leakproofness and compressive strength, still can adjust the size of second sealed clearance on left and right sides direction through the thickness that changes second sealed 6 of filling up to satisfy different sealing medium's sealed demand.

In some embodiments, the first fixing member 31 is provided with a plurality of first through holes 311, the plurality of first through holes 311 penetrate through the first fixing member 31 in the axial direction of the shaft member 2, the magnetic fluid sealing device for a stirrer further includes a plurality of first adjusting members 7, the plurality of first adjusting members 7 are in one-to-one correspondence with the plurality of first through holes 311, the first adjusting members 7 are provided in the first through holes 311, and one end of the first adjusting members 7 is connected to the first pole piece 32. The first adjusting member 7 in the present embodiment is an adjusting screw or an adjusting bolt.

As shown in fig. 1, the right end of the first adjusting member 7 is connected to the first pole piece 32. As shown in fig. 3, the first fixing member 31 is provided with four sets of first through holes 311, and the four sets of first through holes 311 are arranged at intervals of 90 ° in the circumferential direction of the first fixing member 31. Each set of the first through holes 311 includes three first through holes 311, and the three first through holes 311 are arranged at intervals in the radial direction of the first fixing member 31. It is understood that the number of the first through holes 311 in the present application is not limited thereto, and the number of the first through holes 311 is adapted to the number of the first pole pieces 32.

The second fixing member 41 is provided with a plurality of second through holes 411, the second through holes 411 penetrate through the second fixing member 41 in the axial direction of the shaft member 2, the magnetic liquid sealing device for the stirrer further comprises a plurality of second adjusting members 8, the second adjusting members 8 are in one-to-one correspondence with the second through holes 411, the second adjusting members 8 are arranged in the second through holes 411, and one ends of the second adjusting members 8 are connected with the second pole shoe 42. The structure and size of the second fixing member 41 are the same as those of the first fixing member 31, the number of the first through holes 311 is the same as that of the second through holes 411, and the number of the second through holes 411 is matched with that of the second pole pieces 42. The second adjusting member 8 in the present embodiment is an adjusting screw or an adjusting bolt. As shown in fig. 1 and 2, the left end of the second adjusting member 8 is connected to the second pole piece 42.

In some embodiments, the magnetic liquid sealing apparatus for a stirrer further includes a spacer 9, the spacer 9 is provided in the chamber 101, an outer periphery of the spacer 9 is in contact with an inner wall of the housing 1, and the spacer 9 is provided between the first fixing member 31 and the second fixing member 41, the shaft member 2 penetrates the spacer 9, and the spacer 9 and an outer periphery of the annular protrusion 23 have a predetermined clearance in a radial direction of the shaft member 2. As shown in fig. 1 and 2, the left end surface of the spacer 9 is in contact with the right end surface of the first fixing member 31, and the right end surface of the spacer 9 is in contact with the left end surface of the second fixing member 41.

According to the magnetic liquid sealing device for the stirrer, disclosed by the embodiment of the invention, the annular bulge 23 can be prevented from colliding with the shell 1 by arranging the isolation sleeve 9, the sealing failure is avoided, the service life is prolonged, and the sizes of the first sealing gap and the second sealing gap in the left and right directions can be adjusted by adjusting the size of the isolation sleeve 9 in the left and right directions, so that the sealing requirements of different sealing media are met.

In some embodiments, the magnetic liquid seal apparatus for a stirrer further comprises an end cap 12 and a seal 13, the end cap 12 is used for sealing the chamber 101, the shaft member 2 passes through the end cap 12, and the seal 13 is provided between the end cap 12 and the housing 1.

As shown in fig. 1 and 2, an end cap 12 is provided at the right end of the housing 1, and the end cap 12 is connected to the end cap 12 by bolts, the shaft member 2 passes through the end cap 12, and the end cap 12 is used to seal the chamber 101. The seal 13 may be a sealing felt.

According to the magnetic liquid sealing device for the stirrer, disclosed by the embodiment of the invention, the sealing property of the cavity can be improved by arranging the sealing element, and the size of the second sealing gap in the left and right directions can be adjusted by adjusting the thickness of the sealing element, so that the sealing requirements of different sealing media are met. It can be understood that, in the embodiment of the present invention, the size of the first sealing gap and the size of the second sealing gap in the left-right direction can be adjusted by adjusting the size of the spacer sleeve in the left-right direction and the thickness of the sealing element simultaneously or respectively, so as to meet the sealing requirements of different sealing media.

In some embodiments, the outer peripheral surface of the first fixing member 31 and the outer peripheral surface of the second fixing member 41 are both provided with grooves, and the magnetic liquid sealing device for a stirrer further comprises a first sealing ring 10 and a second sealing ring 11, wherein the first sealing ring 10 is arranged in the groove of the first fixing member 31, and the second sealing ring 11 is arranged in the groove of the second fixing member 41.

According to the magnetic liquid sealing device for the stirrer provided by the embodiment of the invention, the leakage of the magnetic liquid from between the first fixing piece 31 and the inner wall surface of the shell 1 can be avoided by arranging the first sealing ring 10, and the leakage of the magnetic liquid from between the second fixing piece 41 and the inner wall surface of the shell 1 can be avoided by arranging the second sealing ring 11, so that the sealing property of the magnetic liquid is improved.

A magnetic liquid sealing apparatus for a stirrer according to some embodiments of the present invention will be described with reference to fig. 1 and 3.

The magnetic liquid sealing device for the stirrer according to the embodiment of the invention comprises a housing 1, a shaft member 2, a first magnetic liquid sealing assembly 3, a second magnetic liquid sealing assembly 4, a plurality of first adjusting members 7, a first sealing gasket 5, a second sealing gasket 6, an isolation sleeve 9, a first sealing ring 10, a second sealing ring 11, an end cover 12 and a sealing member 13.

The housing 1 has a chamber 101 therein. The left end of the shell 11 is provided with a flange portion 102, the flange portion 102 is provided with a plurality of threaded holes, the flange portion 102 is suitable for being connected with external equipment, the left end of the shell 1 is further provided with a groove, and a sealing ring is arranged in the groove.

The shaft part 2 horizontally penetrates through the shell 1 along the left-right direction, the left side and the right side of the rotating shaft 21 extend out of the shell 1, an annular bulge 23 is arranged on the periphery of the shaft part 2, the annular bulge 23 is located in the cavity 101, and a preset interval is formed between the periphery of the annular bulge 23 and the inner wall of the shell 1 in the up-down direction.

The shaft member 2 comprises a rotating shaft 21, the shaft member 2 is arranged on the housing 1 in a penetrating way and can rotate relative to the housing 1, at least part of the rotating shaft 21 is positioned in the cavity 101, the annular bulge 23 is arranged on the periphery of the rotating shaft 21, and the annular bulge 23 and the rotating shaft 21 are of an integrated structure.

The first magnetic liquid seal assembly 3 and the second magnetic liquid seal assembly 4 are respectively sleeved on the shaft component 2, the first magnetic liquid seal assembly 3 and the second magnetic liquid seal assembly 4 are arranged at intervals in the left-right direction, the annular bulge 23 is located between the first magnetic liquid seal assembly 3 and the second magnetic liquid seal assembly 4, the first magnetic liquid seal assembly 3 and the annular bulge 23 are provided with a first seal gap in the axial direction of the shaft component 2, magnetic liquid is adsorbed in the first seal gap, the second magnetic liquid seal assembly 4 and the annular bulge 23 are provided with a second seal gap in the axial direction of the shaft component 2, and magnetic liquid is adsorbed in the second seal gap.

The first magnetic liquid sealing assembly 3 comprises a first fixing member 31, a plurality of first pole shoes 32 and first permanent magnets 33, the first fixing member 31 is sleeved on the shaft member 2, the periphery of the first fixing member 31 is in contact with the inner wall of the shell 1, the plurality of first pole shoes 32 and the first permanent magnets 33 are arranged between the first fixing member 31 and the annular protrusion 23, the plurality of first pole shoes 32 are arranged at intervals in the up-down direction, a first sealing gap is formed between the first pole shoes 32 and the annular protrusion 23, and the first permanent magnets 33 are arranged between the adjacent first pole shoes 32.

The first fixing member 31 is provided with a plurality of first through holes 311, the first fixing member 31 is penetrated through the first through holes 311 in the left-right direction, the first adjusting members 7 are in one-to-one correspondence with the first through holes 311, the first adjusting members 7 are arranged in the first through holes 311, and the right end of the first adjusting members 7 is connected with the first pole shoe 32.

The first fixing member 31 has a groove on its outer peripheral surface, and the first seal ring 10 is disposed in the groove of the first fixing member 31.

The second magnetic liquid sealing assembly 4 includes a second fixing member 41, a plurality of second pole shoes 42 and second permanent magnets 43, the second fixing member 41 is sleeved on the shaft member 2, the outer circumference of the second fixing member 41 contacts with the inner wall of the casing 1, the plurality of second pole shoes 42 and the second permanent magnets 43 are both arranged between the second fixing member 41 and the annular protrusion 23, the plurality of second pole shoes 42 are arranged at intervals in the up-down direction, a second sealing gap is formed between the second pole shoes 42 and the annular protrusion 23, and the second permanent magnets 43 are arranged between the adjacent second pole shoes 42.

The second fixing member 41 is provided with a plurality of second through holes 411, the second through holes 411 penetrate through the second fixing member 41 in the axial direction of the shaft member 2, the magnetic liquid sealing device for the stirrer further comprises a plurality of second adjusting members 8, the second adjusting members 8 are in one-to-one correspondence with the second through holes 411, the second adjusting members 8 are arranged in the second through holes 411, and the left end of the second adjusting member 8 is connected with the second pole piece 42.

A groove is formed on the outer peripheral surface of the second fixing member 41, and the second seal ring 11 is disposed in the groove of the second fixing member 41.

The first seal 5 is disposed between the first pole piece 32 and the first fixing member 31, and the second seal 6 is disposed between the second pole piece 42 and the second fixing member 41.

The left end face of the first seal 5 is in contact with the right end face of the first fixing member 31, the outer peripheral surface of the first seal 5 is substantially flush with the outer peripheral surface of the outermost one of the plurality of first pole pieces 32, and the inner peripheral surface of the first seal 5 is substantially flush with the inner peripheral surface of the innermost one of the plurality of first pole pieces 32. The right end surface of the second seal 6 is in contact with the left end surface of the second fixing member 41, the outer peripheral surface of the second seal 6 is substantially flush with the outer peripheral surface of the outermost one of the second pole pieces 42, and the inner peripheral surface of the second seal 6 is substantially flush with the inner peripheral surface of the innermost one of the second pole pieces 42.

The separation sleeve 9 is arranged in the chamber 101, the periphery of the separation sleeve 9 is in contact with the inner wall of the shell 1, the separation sleeve 9 is arranged between the first fixing piece 31 and the second fixing piece 41, the left end face of the separation sleeve 9 is in contact with the right end face of the first fixing piece 31, the right end face of the separation sleeve 9 is in contact with the left end face of the second fixing piece 41, the shaft component 2 penetrates through the separation sleeve 9, and the separation sleeve 9 and the periphery of the annular protrusion 23 are provided with a preset gap in the up-down direction.

An end cover 12 is arranged at the right end of the shell 1, the end cover 12 is connected with the end cover 12 through bolts, the shaft part 2 penetrates through the end cover 12, and a sealing piece 13 is arranged between the end cover 12 and the shell 1.

The operation principle of the magnetic liquid sealing apparatus for a stirrer according to the embodiment of the present invention is described below with reference to fig. 1 and 3.

According to the magnetic liquid sealing device for the stirrer, disclosed by the embodiment of the invention, the first magnetic liquid sealing element and the second magnetic liquid sealing element respectively form the first sealing gap and the second sealing gap with the annular bulge 23 in the left-right direction, when the shaft part 2 radially jumps, the annular bulge 23 cannot collide with a pole shoe, the sealing failure can be avoided, and the service life is prolonged.

The magnetic liquid sealing apparatus for a stirrer according to some embodiments of the present invention will be described with reference to fig. 2 and 3.

The magnetic liquid sealing device for the stirrer according to the embodiment of the invention comprises a housing 1, a shaft member 2, a first magnetic liquid sealing assembly 3, a second magnetic liquid sealing assembly 4, a plurality of first adjusting members 7, a first sealing gasket 5, a second sealing gasket 6, an isolation sleeve 9, a first sealing ring 10, a second sealing ring 11, an end cover 12, a sealing member 13 and a plurality of stop members 14.

The shaft member 2 includes a rotating shaft 21 and a shaft sleeve 22, the rotating shaft 21 is disposed on the housing 1 and is rotatable relative to the housing 1, at least a portion of the rotating shaft 21 is located in the cavity 101, the shaft sleeve 22 is disposed on the rotating shaft 21, the shaft sleeve 22 is at least partially located in the cavity 101, and the annular protrusion 23 is disposed on an outer periphery of the shaft sleeve 22. As shown in fig. 1, the annular protrusion 23 and the shaft sleeve 22 are of an integral structure, an inner circumferential surface of the shaft sleeve 22 contacts with an outer circumferential surface of the rotating shaft 21, a plurality of sealing rings are arranged between the shaft sleeve 22 and the rotating shaft 21, the plurality of sealing rings are respectively sleeved on the rotating shaft 21, and the plurality of sealing rings are arranged at intervals in the left-right direction.

The shaft sleeve 22 is provided with a plurality of mounting holes 221, the mounting holes 221 penetrate through the shaft sleeve 22 in the vertical direction, the plurality of stopping pieces 14 correspond to the plurality of mounting holes 221 one by one, the stopping pieces 14 are arranged in the mounting holes 221, and one end, close to the rotating shaft 21, of each stopping piece 14 is abutted to the rotating shaft 21.

The other structure and operation of the magnetic liquid sealing apparatus for a stirrer shown in fig. 2 may be the same as those of the embodiment shown in fig. 1, and will not be described in detail.

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

1. A magnetic liquid sealing device for agitator, characterized in that, comprising:

a housing having a chamber therein;

a shaft member, the shaft member is penetrated on the casing and is rotatable relative to the casing, at least a part of the shaft member is located in the cavity, and the outer circumference of the shaft member is provided with an annular protrusion, the annular protrusion is located in the chamber;

The first magnetic liquid sealing assembly and the second magnetic liquid sealing assembly are respectively sleeved on the shaft member, and the first magnetic liquid sealing assembly and the second magnetic liquid sealing assembly are respectively sleeved on the shaft member. Two magnetic liquid sealing assemblies are arranged at intervals in the axial direction of the shaft member, the annular protrusion is located between the first magnetic liquid sealing assembly and the second magnetic liquid sealing assembly,

The first magnetic liquid sealing component and the annular protrusion have a first sealing gap in the axial direction of the shaft member, magnetic liquid is adsorbed in the first sealing gap, and the second magnetic liquid sealing component is connected to the shaft member. The annular protrusion has a second sealing gap in the axial direction of the shaft member, and magnetic liquid is adsorbed in the second sealing gap;

an end cap, the end cap is connected with the housing, the end cap is used to seal the chamber, and one end of the shaft part passes through the end cap;

A seal, the seal is provided between the end cover and the housing.

2 . The magnetic liquid sealing device for a stirrer according to claim 1 , wherein the shaft member comprises a rotating shaft, and the rotating shaft is at least partially rotatably provided in the chamber, and the annular protrusion is rotatable. 3 . on the outer circumference of the rotating shaft.

3 . The magnetic liquid sealing device for a stirrer according to claim 1 , wherein the shaft member comprises a rotating shaft and a shaft sleeve, and the rotating shaft passes through the casing and is opposite to the casing. 4 . The body is rotatable, at least part of the rotating shaft is located in the cavity, the sleeve is sleeved on the rotating shaft, and at least part of the sleeve is located in the cavity, and the annular protrusion is disposed in the cavity Outer circumference of the bushing.

4 . The magnetic liquid sealing device for agitator according to claim 3 , wherein the shaft sleeve is provided with a plurality of mounting holes, and the mounting holes penetrate the shaft in the radial direction of the rotating shaft. 5 . set,

The magnetic liquid sealing device for agitator further comprises a plurality of stoppers, the stoppers correspond to the installation holes one-to-one, and the stoppers are arranged in the installation holes, The stopper is used for fixing the shaft sleeve.

5 . The magnetic liquid sealing device for a stirrer according to claim 1 , wherein the first magnetic liquid sealing assembly comprises a first fixing member, a plurality of first pole pieces and a first permanent magnet, the The first fixing piece is sleeved on the shaft member, the outer circumference of the first fixing piece is in contact with the inner wall of the housing, and the plurality of first pole pieces and the first permanent magnets are all arranged on the Between the first fixing member and the annular protrusion, a plurality of the first pole pieces are arranged at intervals in the radial direction of the shaft member, and the first sealing gap is formed between the first pole pieces and the annular protrusion between the protrusions, the first permanent magnet is arranged between the adjacent first pole pieces,

The second magnetic liquid sealing assembly includes a second fixing member, a plurality of second pole pieces and a second permanent magnet, the second fixing member is sleeved on the shaft member, and the outer periphery of the second fixing member is connected to the The inner walls of the housing are in contact, a plurality of the second pole pieces and the second permanent magnets are all arranged between the second fixing member and the annular protrusion, and the plurality of the second pole pieces are located there. The shaft parts are arranged at intervals in the radial direction, the second sealing gap is formed between the second pole piece and the annular protrusion, and the second permanent magnet is provided between adjacent second pole pieces.

6. The magnetic liquid sealing device for a stirrer according to claim 5, wherein a plurality of the first pole pieces and a plurality of the second pole pieces are opposed to each other in the axial direction of the shaft member set up.

7. The magnetic liquid sealing device for a stirrer according to claim 5, further comprising a first sealing gasket and a second sealing gasket, the first sealing gasket is provided between the first pole piece and the Between the first fixing pieces, the second sealing gasket is arranged between the second pole piece and the second fixing piece.

8 . The magnetic liquid sealing device for a stirrer according to claim 5 , wherein the first fixing member is provided with a plurality of first through holes, and a plurality of the first through holes are located in the The axial direction of the shaft member penetrates the first fixing member,

The magnetic liquid sealing device for a stirrer further includes a plurality of first adjusting pieces, the plurality of first adjusting pieces are in one-to-one correspondence with the plurality of first through holes, and the first adjusting pieces are arranged at the inside the first through hole, and one end of the first adjusting member is connected with the first pole piece;

The second fixing member is provided with a plurality of second through holes, and the plurality of second through holes penetrate through the second fixing member in the axial direction of the shaft member,

The magnetic liquid sealing device for a stirrer further includes a plurality of second adjusting pieces, the plurality of second adjusting pieces are in one-to-one correspondence with the plurality of the second through holes, and the second adjusting pieces are arranged at the inside the second through hole, and one end of the second adjusting member is connected with the second pole piece.

9 . The magnetic liquid sealing device for a stirrer according to claim 5 , further comprising an isolation sleeve, the isolation sleeve is arranged in the chamber, and the outer periphery of the isolation sleeve is connected to the housing. 10 . The inner wall of the spacer is in contact, and the spacer sleeve is arranged between the first fixing member and the second fixing member, the shaft member penetrates the spacer sleeve, and the spacer sleeve and the outer circumference of the annular protrusion are at The shaft member has a predetermined clearance in the radial direction.

10 . The magnetic liquid sealing device for a stirrer according to claim 5 , wherein the outer peripheral surface of the first fixing member and the outer peripheral surface of the second fixing member are provided with 10 . groove,

The magnetic liquid sealing device for agitators further includes a first sealing ring and a second sealing ring, the first sealing ring is arranged in the groove of the first fixing member, and the second sealing ring is arranged in the groove of the first fixing member. in the groove of the second fixing member.