CN105202198B - Flexible pole shoe device for sealing magnetic fluid - Google Patents
Flexible pole shoe device for sealing magnetic fluid Download PDFInfo
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- CN105202198B CN105202198B CN201510599922.3A CN201510599922A CN105202198B CN 105202198 B CN105202198 B CN 105202198B CN 201510599922 A CN201510599922 A CN 201510599922A CN 105202198 B CN105202198 B CN 105202198B
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- pole shoe
- flexible pole
- sealing
- axle sleeve
- shell
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Abstract
Flexible pole shoe device for sealing magnetic fluid, belongs to sealing field of mechanical engineering.Mainly include the parts such as shell (1), end cap (3), permanent magnet (5), flexible pole shoe (6), soft iron (7), foreboard (8), backboard (9), axle sleeve (11) and coating (12).During flexible pole shoe device for sealing magnetic fluid work, the line of magnetic induction constitutes magnetic circuit from permanent magnet by soft iron, flexible pole shoe, coating and axle sleeve.Magnetic fluid is assembled and adsorbed around the flexible pole shoe between baffle plate and rotating shaft surface and its in gap, plays a part of bearing sealing medium axial compressive force and closure medium leakage channel, so as to realize sealing function.
Description
Technical field
The invention belongs to sealing field of mechanical engineering, particularly a kind of device for sealing magnetic fluid.
Technical background
In the major diameter main shaft seal in solving the problems, such as some large-scale petrochemical equipment and marine machinery, rotating shaft sealing is direct
It has impact on the stability of mechanism overall operation, it may be said that Sealing Technology is typically to determine that can a certain important technical fundamentally real
Existing key factor.Traditional seal form is both advantageous and disadvantageous：Packing seal structure is simple, but sealability is not enough, service life
Cycle is shorter, and needs to regularly replace filler, causes a series of related challenges such as assembling；Mechanical seal possesses good
Sealing property, seal and pressure bearing ability is high, but under the conditions of major diameter, sealing device structure is huge, and assembly relation is complex, dress
It is difficult to ensure that with precision.And magnet fluid sealing has simple zero leakage, sealing structure, sealing small power consumption, can applied at higher turn
The advantages of under speed.
In magnetic fluid sealing structure, the gap between pole tooth and rotating shaft is seal clearance, magnetic fluid is filled with therebetween, due to pole
Magnetic field can be assembled and be strengthened to boots structure, and magnetic fluid is adsorbed at this, in the liquid sealing ring of seal clearance formation likeness in form O-ring,
Play a part of bearing sealing medium axial compressive force and closure medium leakage channel.The presence of seal clearance is magnet fluid sealing
The advantage of structure, is also to occur to reveal and need sealed key point.
Generally, will in the design of sealing device in order to ensure the voltage endurance capability and reliability of magnet fluid sealing
Seal clearance as small as possible is chosen, but in practical application, less seal clearance can bring problems again：First, it is close
Envelope gap is constrained by rotating shaft circular runout, and seal clearance is too small, easily causes colliding with for rotating shaft and pole between cog, or even generation
Pole tooth " seizes " phenomenon, and this not only influences the performance of magnet fluid sealing, and sealedly failure can be also caused when serious and is destroyed, together
When, less seal clearance also brings great difficulty to processing and assembling；Secondly, in dynamic sealing, smaller seal clearance meeting
Bigger shear rate is brought, the frictional heat that thus magnetic fluid is produced is also bigger, especially under the conditions of major diameter, circumference bounce
Touch to rub Deng caused by and also result in the rise of local temperature, the stability and service life of magnetic fluid can also be decreased.
Existing brush device for sealing magnetic fluid is if application publication number is as described in CN 103925372A patent application.Should
Device also has the deficiency of itself while original device for sealing magnetic fluid and defect is solved the problems, such as：By the different bristle of length
The seal of composition has very big difficulty in manufacture and fit on；Be present certain leakage field in the pole shoe of magnetic conductive material, can weaken
Magnetic field intensity around brush filament, reduces sealing property；Long brush hairs beam is directly contacted with rotating shaft surface, and long-play can countershaft
Produce and wear and tear, and the premise that sealing is realized is to constitute magnetic loop, that is, it must be magnetic conductive material to require rotating shaft, so further limited
Sealed application scenario is made.
The content of the invention
The technical problem to be solved in the invention is, lance of the existing device for sealing magnetic fluid when designing seal clearance
Shield.Too small seal clearance, while seal and pressure bearing ability is improved, easily causes rotating shaft and colliding with even for pole between cog occurs
" seizing " phenomenon, reduces sealed safety and reliability, and bring great difficulty to process and assemble；And excessive sealing
Gap, can not provide enough seal and pressure bearing abilities, limit the application of magnet fluid sealing again.Therefore provide a kind of flexible
Pole shoe device for sealing magnetic fluid.
The technical solution adopted for the present invention to solve the technical problems is：
Flexible pole shoe device for sealing magnetic fluid, it is characterised in that including：Shell (1), pad (2), end cap (3), screw
(4), permanent magnet (5), flexible pole shoe (6), soft iron (7), foreboard (8), backboard (9), sealing ring (10), axle sleeve (11), coating
(12), right side sealing ring (13), left side sealing ring (15).
Constitute the annexation between each several part of the device：The sealing ring (10) is arranged on axle sleeve (11) inner surface
In seal groove；There is one layer of coating (12) outer surface of axle sleeve (11), and there are an annular permanent magnet (5), ring-type in the periphery of axle sleeve (11)
Permanent magnet (5) and axle sleeve (11) coaxially, and with certain space, annular permanent-magnet between annular permanent magnet (5) and axle sleeve (11)
Iron (5) left and right ends face is respectively disposed with one group of potted component, and potted component is cyclic structure, potted component include soft iron (7),
Between backboard (9), flexible pole shoe (6) and foreboard (8), potted component by welding, the mode such as gluing be composed of a fixed connection entirety,
Permanent magnet (5) left and right ends face is contacted with soft iron (7)；It is backboard (9) in the ring of soft iron (7), backboard (9) does not connect with axle sleeve (11)
Touch, with space；Soft iron (7) is flushed with the contact surface of backboard (9) with the inner ring surface of permanent magnet (5)；In soft iron (7) and backboard
(9) outer face is flexible pole shoe (6), and flexible pole shoe (6) uses magnetic conductive material, and flexible pole shoe (6) is close row in order
The ring of the flexible tow composition of row, the radial direction of the direction of tow along ring, flexible pole shoe (6) has certain axial width, and tow passes through
The mode such as clip or gluing, welding constitutes entirety, and the inner ring surface of flexible pole shoe (6) is contacted with coating (12) surface；Flexible pole
The outer face of boots (6) is foreboard (8), and the outer face of the foreboard (8) of the left and right sides is respectively shell (1) and end cap (3), shell
(1) it is fixedly connected with end cap (3) by screw and nut, by permanent magnet (5), flexible pole shoe (6), soft iron (7), foreboard (8), the back of the body
(9 are fastened in the cavity of shell (1) plate, and shell (1) is fixed by screws on axle sleeve (11).
The right side sealing ring (13) and left side sealing ring (15) are arranged on foreboard (8) outer ring surface of two groups of potted components
In seal groove.
The end cap (3) is arranged on the right side of shell (1), and by screw (4) that end cap (3) and shell (1) is fixed, is made outer
The internal each part axial positioning of shell (1).
The pad (2) is arranged in the junction between end cap (3) and shell (1).
The axle sleeve (11) constitutes entirety, the coating (12) with coating (12) by the mode such as welding or gluing or spraying
Using non-permeable material.
The axle sleeve (11) is fixed in rotating shaft by lock-screw (14).
The shell (1) is machined with the screwed hole of mounting screw (4).
The end cap (3) is machined with the through hole of attachment screw (4).
Axle sleeve (11) inner circle is machined with the annular seal grooves for installing sealing ring (10), and is machined with installation locking spiral shell
The screwed hole of (14) is followed closely, using magnetic conductive material.
The foreboard (8) uses non-permeable material, there is certain interval between its inner ring surface and coating (12) surface, its
Outer ring surface is machined with the annular seal grooves for installing left and right sides sealing ring；
The backboard (9) uses non-permeable material；There is certain interval between its inner ring surface and coating (12) surface；
Soft iron (7) is using the good material of magnetic property.
The present invention is compared with prior art to be had the advantage that：
The flexible pole shoe that the flexible pole shoe device for sealing magnetic fluid makes of magnetic conductive material replaces traditional pole tooth and magnetic
Pole, flexible pole shoe fine and closely woven first is full of seal clearance, forms the structure similar to brush seal brush filament, fluid is generated certainly
Sealing effect, improves sealed bearing capacity to a certain extent；Moreover, the fine and closely woven flexible pole shoe tow uniformly arranged can compare
Traditional hard pole shoe produces magnetic field stronger, evenly, more stable, and magnetic fluid is full of flexible pole shoe silk gap, further obstruction
Medium leakage channel, therefore, flexible pole shoe magnet fluid sealing can have stronger bearing capacity and steady than traditional magnet fluid sealing
It is qualitative.Secondly, the use of flexible pole shoe so that the small―gap suture that the past cannot be reached by security reason even zero clearance turns into can
Can, largely improve sealed performance, and the flexibility of flexible pole shoe not only can be solved effectively under small―gap suture, rotating shaft with
Problem of colliding between pole shoe, the processing of reduction magnet fluid sealing and assembly difficulty, while also can the moment interference between equipment start-stop
In the case of, keep sealability constant, effectively increase the availability and security of magnet fluid sealing, further expand magnetic current
The application of body Sealing Technology.
Brief description of the drawings
Fig. 1 flexibility pole shoe device for sealing magnetic fluid structure charts.
In Fig. 1：1 shell, 2 pads, 3 end caps, 4 screws, 5 permanent magnets, 6 flexible pole shoes, 7 soft irons, 8 foreboards, 9 backboards, 10
Sealing ring, 11 axle sleeves, 12 coatings, 13 right side sealing rings, 14 lock-screws, 15 left side sealing rings.
Embodiment
By embodiment of accompanying drawing, the invention will be further described：Obviously, described embodiment is only this
A part of embodiment of invention, rather than whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art exist
The every other embodiment obtained on the premise of not making creative work, belongs to the scope of protection of the invention.
Embodiment 1
Flexible pole shoe device for sealing magnetic fluid, such as Fig. 1, device includes：Shell 1, pad 2, end cap 3, screw 4, permanent magnetism
Iron 5, flexible pole shoe 6, soft iron 7, foreboard 8, backboard 9, sealing ring 10, axle sleeve 11, coating 12, right side sealing ring 13, lock-screw
14 and left side sealing ring 15；
Constitute the connection between each several part of the device：
The left and right ends of permanent magnet 5 are respectively disposed with one group of potted component, potted component include successively soft iron 7, backboard 9,
Entirety is constituted by welding, the mode such as gluing between flexible pole shoe 6 and foreboard 8, potted component, permanent magnet 5 and left and right ends with
Soft iron 7 is contacted；
The left and right sides sealing ring 15,13 is arranged in the cylindrical seal groove of the foreboard 8 of two groups of potted components；
The end cap 3 is arranged on the right side of shell 1, and is fixed end cap 3 and shell 1 by screw 4, makes enclosure each zero
Part axially position；
The pad 2 is arranged between end cap 3 and shell 1；
The axle sleeve 11 constitutes entirety with coating 12 by the mode such as welding or gluing or spraying；
The sealing ring 10 is arranged in the seal groove of the inner circle of axle sleeve 11；
The axle sleeve 11 is fixed in rotating shaft by lock-screw 14；
The shell 1 uses non-permeable material, such as stainless steel, and is machined with the screwed hole of mounting screw 4；
The end cap 3 uses non-permeable material, such as stainless steel, and is machined with the through hole of attachment screw 4；
The flexible pole shoe 6 is using the excellent material of magnetic property, such as permalloy, flexible pole shoe 6 be close-packed arrays simultaneously
There is certain thickness flexible tow, tow constitutes entirety by the mode such as clip or gluing, welding, and its length can make its end
Contacted with the surface of coating 12；
The soft iron 7 is using the good material of magnetic property, such as electrical pure iron；
The foreboard 8 uses non-permeable material, such as stainless steel, between existing necessarily between its inner circle and the surface of coating 12
Gap, its Excircle machining has the annular seal grooves for installing left and right sides sealing ring 15,13；
The backboard 9 uses non-permeable material, such as stainless steel, between existing necessarily between its inner circle and the surface of coating 12
Gap；
The axle sleeve 11 is machined with installation sealing ring 10 using the good material of magnetic property, such as electrical pure iron, its inner circle
Annular seal grooves, and be machined with the screwed hole of installation locking screw 14；
The coating 12 uses non-permeable material, such as copper, ceramics；
The permanent magnet 5 selects Ru-Fe-Mn.
Solve existing device for sealing magnetic fluid bearing capacity limited, process and assemble difficulty is big, required precision is high, pole tooth with
Easily collided between rotating shaft, the problems such as occurring " seizing " phenomenon.During flexible pole shoe device for sealing magnetic fluid work, the line of magnetic induction is from forever
Magnet, magnetic circuit is constituted by soft iron, flexible pole shoe, coating and axle sleeve.Magnetic fluid is assembled and adsorbed in baffle plate and rotating shaft table
Around flexible pole shoe between face and its in gap, the work for bearing sealing medium axial compressive force and closure medium leakage channel is played
With so as to realize sealing function.
Claims (5)
1. a kind of flexible pole shoe device for sealing magnetic fluid, it is characterised in that including：Shell (1), pad (2), end cap (3), screw
(4), permanent magnet (5), flexible pole shoe (6), soft iron (7), foreboard (8), backboard (9), sealing ring (10), axle sleeve (11), coating
(12), right side sealing ring (13), left side sealing ring (15)；
Constitute the annexation between each several part of the device：The sealing ring (10) is arranged on the sealing of axle sleeve (11) inner surface
In groove；There is one layer of coating (12) outer surface of axle sleeve (11), and there are an annular permanent magnet (5), annular permanent-magnet in the periphery of axle sleeve (11)
Iron (5) and axle sleeve (11) coaxially, and with certain space, annular permanent magnet (5) between annular permanent magnet (5) and axle sleeve (11)
Left and right ends face is respectively disposed with one group of potted component, and potted component is cyclic structure, and potted component includes soft iron (7), backboard
(9) be composed of a fixed connection entirety between, flexible pole shoe (6) and foreboard (8), potted component, permanent magnet (5) left and right ends face with it is soft
Iron (7) is contacted；It is backboard (9) in the ring of soft iron (7), backboard (9) is not contacted with axle sleeve (11), with space；Soft iron (7) and the back of the body
The contact surface of plate (9) is flushed with the inner ring surface of permanent magnet (5)；It is flexible pole shoe in the outer face of soft iron (7) and backboard (9)
(6), flexible pole shoe (6) uses magnetic conductive material, and flexible pole shoe (6) is the ring of the flexible tow composition of close ordered arrangement, silk
Radial direction of the direction of beam along ring, flexible pole shoe (6) has certain axial width, and tow passes through clip, gluing or welding manner group
Integral, the inner ring surface of flexible pole shoe (6) is contacted with coating (12) surface；The outer face of flexible pole shoe (6) is foreboard (8), left
The outer face of the foreboard (8) of right both sides is respectively shell (1) and end cap (3), and shell (1) and end cap (3) are fixed by screw to be connected
Connect, by permanent magnet (5), flexible pole shoe (6), soft iron (7), foreboard (8), (9 are fastened in the cavity of shell (1) backboard, shell
(1) it is fixed by screws on axle sleeve (11)；
Pad (2) is arranged in the junction between end cap (3) and shell (1)；Coating (12) uses non-permeable material；Foreboard
(8) non-permeable material is used；Backboard (9) uses non-permeable material, and axle sleeve (11) uses magnetic conductive material.
2. according to a kind of flexible pole shoe device for sealing magnetic fluid of claim 1, it is characterised in that pass through weldering between potted component
Connect or gluing mode is composed of a fixed connection entirety.
3. according to a kind of flexible pole shoe device for sealing magnetic fluid of claim 1, it is characterised in that the end cap (3) is arranged on
On the right side of shell (1), and it is by screw (4) that end cap (3) and shell (1) is fixed, make the internal each part axial positioning of shell (1).
4. according to a kind of flexible pole shoe device for sealing magnetic fluid of claim 1, it is characterised in that the axle sleeve (11) and coating
(12) entirety is constituted by way of welding or gluing or spraying.
5. according to a kind of flexible pole shoe device for sealing magnetic fluid of claim 1, it is characterised in that axle sleeve (11) passes through locking screw
Nail (14) is fixed in rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510599922.3A CN105202198B (en) | 2015-09-18 | 2015-09-18 | Flexible pole shoe device for sealing magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510599922.3A CN105202198B (en) | 2015-09-18 | 2015-09-18 | Flexible pole shoe device for sealing magnetic fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105202198A CN105202198A (en) | 2015-12-30 |
| CN105202198B true CN105202198B (en) | 2017-09-22 |
Family
ID=54950041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510599922.3A Active CN105202198B (en) | 2015-09-18 | 2015-09-18 | Flexible pole shoe device for sealing magnetic fluid |
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| Country | Link |
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| CN (1) | CN105202198B (en) |
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| JP2000002339A (en) * | 1998-06-12 | 2000-01-07 | Nok Corp | Sealing device using magnetic fluid |
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| CN103759015A (en) * | 2014-01-17 | 2014-04-30 | 北京交通大学 | Micro-pump type upstream pumping magnetic-fluid sealing device |
| CN103925372A (en) * | 2014-05-04 | 2014-07-16 | 北京交通大学 | Brush type magnetic liquid sealing device |
| CN203963025U (en) * | 2014-07-02 | 2014-11-26 | 袁月 | Improve sealing configuration |
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2015
- 2015-09-18 CN CN201510599922.3A patent/CN105202198B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1201601A1 (en) * | 1984-06-18 | 1985-12-30 | Предприятие П/Я А-1614 | Magnetofluid seal |
| JPS6231776A (en) * | 1985-08-02 | 1987-02-10 | Tohoku Metal Ind Ltd | Magnetic-fluid sealing device |
| JP2000002339A (en) * | 1998-06-12 | 2000-01-07 | Nok Corp | Sealing device using magnetic fluid |
| RU2451225C1 (en) * | 2011-05-19 | 2012-05-20 | Открытое акционерное общество "Научно-производственное объединение "Сатурн" (ОАО "НПО "Сатурн") | Magnetic fluid shaft seal |
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| CN105202198A (en) | 2015-12-30 |
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Inventor after: Li Shuangxi Inventor after: Zhang Yu Inventor after: Zhang Qiuxiang Inventor after: Cai Jining Inventor after: Tang Xiaoyong Inventor before: Li Shuangxi Inventor before: Zhang Yu Inventor before: Zhang Qiuxiang Inventor before: Cai Jining |
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