CN105202198A - Magnetic-fluid sealing device with flexible pole shoe - Google Patents
Magnetic-fluid sealing device with flexible pole shoe Download PDFInfo
- Publication number
- CN105202198A CN105202198A CN201510599922.3A CN201510599922A CN105202198A CN 105202198 A CN105202198 A CN 105202198A CN 201510599922 A CN201510599922 A CN 201510599922A CN 105202198 A CN105202198 A CN 105202198A
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- pole shoe
- flexible pole
- axle sleeve
- shell
- permanent magnet
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Abstract
The invention discloses a magnetic-fluid sealing device with a flexible pole shoe, and belongs to the field of the sealing of mechanical engineering. The magnetic-fluid sealing device with the flexible pole shoe mainly comprises parts of a shell (1), an end cover (3), a permanent magnet (5), the flexible pole shoe (6), a soft iron (7), a front board (8), a back board (9), a shaft sleeve (11), a coating (12) and the like. When the magnetic-fluid sealing device with the flexible pole shoe operates, a magnetic loop is formed by a magnetic induction line starting from the permanent magnet and passing through the soft iron, the flexible pole shoe, the coating and the shaft sleeve. A magnetic fluid is gathered and adsorbed around the flexible pole shoe between a baffle plate and the surface of a rotating shaft and in the gaps of the flexible pole shoe, thereby playing roles in bearing the axial pressure of a sealing medium and blocking a medium leakage passage, so as to realize a 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
When solving the major diameter main shaft seal problem in some large-scale petrochemical equipment and marine machinery, rotating shaft sealing directly affects the stability that whole mechanism is run, and can say that sealing technique normally determines the key factor that can a certain important technical fundamentally realize.Traditional seal form is both advantageous and disadvantageous: packing seal structure is simple, but sealability is not enough, and the cycle in working life is shorter, and needs to regularly replace filler, causes a series of relevant challenges such as assembling; Mechanical seal possesses good sealability, and seal and pressure bearing ability is high, but under major diameter condition, sealing device structure is huge, and assembly relation is comparatively complicated, and assembly precision is difficult to ensure.And magnet fluid sealing has zero leakage, sealing configuration is simple, sealing power consumption is little, can be applied in the inferior advantage of higher rotation speed.
In magnetic fluid sealing structure, gap between pole tooth and rotating shaft is seal clearance, be filled with magnetic fluid therebetween, can assemble due to pole shoe structure and strengthen magnetic field, magnetic fluid is adsorbed in this place, form the liquid sealing ring of likeness in form O shape circle at seal clearance, play the effect of bearing sealing medium axial pressure and shutoff medium leakage.Namely the existence of seal clearance is the advantage of magnetic fluid sealing structure, is also the key point that sealing occurs to reveal and need.
Generally, in order to ensure voltage endurance capability and the reliability of magnet fluid sealing, seal clearance little as far as possible to be chosen when the design of seal arrangement, but in practical application, less seal clearance can bring problems again: first, seal clearance is subject to the constraint of rotating shaft circular runout, seal clearance is too little, easily cause colliding with of rotating shaft and pole between cog, even there is pole tooth " seize " phenomenon, this not only affects the performance of magnet fluid sealing, inefficacy and the destruction of sealing also can be caused time serious, simultaneously, less seal clearance brings great difficulty also to processing and assembling, secondly, in motive sealing, less seal clearance can bring larger shear rate, the frictional heat of magnetic fluid generation is also larger thus, especially under major diameter condition, what circumference to be beated etc. and caused touches to rub and also can cause the rising of local temperature, and the stability of magnetic fluid and working life also can decrease.
Existing brush device for sealing magnetic fluid is if application publication number is for as described in the patent application of CN103925372A.This device, while the original device for sealing magnetic fluid problem of solution and defect, also has the deficiency of self: the Sealing be made up of the bristle that length is different has very large difficulty in manufacture and fit on; There is certain leakage field in the pole shoe of magnetic conductive material, can weaken the magnetic intensity around brush silk, reduces sealability; Long brush hairs bundle directly with rotating shaft surface contact, long-play can produce wearing and tearing by countershaft, and the prerequisite that sealing realizes is formation magnetic loop, namely requires that rotating shaft must be magnetic conductive material, further limit the application of sealing like this.
Summary of the invention
The technical issues that need to address of the present invention are, the contradiction of existing device for sealing magnetic fluid when designing seal clearance.Too small seal clearance, while raising seal and pressure bearing ability, easily causes rotating shaft and colliding with of pole between cog even " seize " phenomenon to occur, reduces the safety and reliability of sealing, and bring great difficulty to processing and assembling; And excessive seal clearance, enough seal and pressure bearing abilities cannot be provided again, limit the application area of magnet fluid sealing.Therefore a kind of flexible pole shoe device for sealing magnetic fluid is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Flexible pole shoe device for sealing magnetic fluid, it is characterized in that, comprising: shell (1), pad (2), end cap (3), screw (4), permanent magnet (5), flexible pole shoe (6), soft iron (7), header board (8), backboard (9), seal ring (10), axle sleeve (11), coating (12), right side seal ring (13), left side seal ring (15).
Annexation between each several part forming this device: described seal ring (10) is arranged in the seal groove of axle sleeve (11) internal surface, the outer surface of axle sleeve (11) has one deck coating (12), there is an annular permanent magnet (5) periphery of axle sleeve (11), annular permanent magnet (5) is coaxial with axle sleeve (11), and between annular permanent magnet (5) and axle sleeve (11), there is certain space, annular permanent magnet (5) left and right both ends of the surface are respectively furnished with one group of seal element, seal element is ring structure, seal element comprises soft iron (7), backboard (9), flexible pole shoe (6) and header board (8), by welding between seal element, the mode such as gluing is composed of a fixed connection entirety, permanent magnet (5) left and right both ends of the surface contact with soft iron (7), be backboard (9) in the ring of soft iron (7), backboard (9) does not contact with axle sleeve (11), has space, soft iron (7) flushes with the inner ring surface of permanent magnet (5) with the surface of contact of backboard (9), flexible pole shoe (6) is at soft iron (7) and the exterior edge face of backboard (9), flexible pole shoe (6) adopts magnetic conductive material, flexible pole shoe (6) is the ring of the flexible tow composition of tight ordered arrangement, the direction of tow is along the radial direction of ring, flexible pole shoe (6) has certain axial thickness, tow forms entirety, the inner ring surface of flexible pole shoe (6) and coating (12) surface contact by modes such as clip or gluing, welding, the exterior edge face of flexible pole shoe (6) is header board (8), the exterior edge face of the header board (8) of the left and right sides is respectively shell (1) and end cap (3), shell (1) is fixedly connected with by screw and nut with end cap (3), by permanent magnet (5), flexible pole shoe (6), soft iron (7), header board (8), backboard, (9 are fastened in the cavity of shell (1), and shell (1) is fixed by screws on axle sleeve (11).
Described right side seal ring (13) and left side seal ring (15) are arranged in the seal groove of header board (8) outer ring surface of two groups of seal elements.
Described end cap (3) is arranged on shell (1) right side, and end cap (3) and shell (1) is fixed by screw (4), makes the inner each part axial location of shell (1).
Described pad (2) is arranged in the joint between end cap (3) and shell (1).
Described axle sleeve (11) and coating (12) by weld, the mode such as gluing, spraying forms entirety, described coating (12) employing non-permeable material.
Described axle sleeve (11) is fixed in rotating shaft by lock screw (14).
Described shell (1) is processed with the tapped hole of mounting screw (4).
Described end cap (3) is processed with the through hole of attachment screw (4).
Described axle sleeve (11) inner circle is processed with the annular seal grooves installing seal ring (10), and is processed with the tapped hole installing lock screw (14), adopts magnetic conductive material.
Described header board (8) adopts non-permeable material, there is certain interval between its inner ring surface and coating (12) surface, and its outer ring surface is processed with the annular seal grooves installing left and right side seal ring;
Described backboard (9) adopts non-permeable material; Certain interval is there is between its inner ring surface and coating (12) surface;
Soft iron (7) adopts the material that magnetic property is good.
The present invention compares had beneficial effect with prior art:
The flexible pole shoe that this flexible pole shoe device for sealing magnetic fluid magnetic conductive material makes replaces traditional pole tooth and magnetic pole, first fine and closely woven flexible pole shoe is full of seal clearance, form the structure being similar to brush seal brush silk, make fluid create selfsealings effect, improve the bearing capacity of sealing to a certain extent; And, the flexible pole shoe tow of fine and closely woven even arrangement can produce than traditional hard pole shoe stronger evenly, more stable magnetic field, magnetic fluid is full of flexible pole shoe silk gap, further obstruction medium leakage, therefore, flexible pole shoe magnet fluid sealing can have stronger bearing capacity and stability than traditional magnet fluid sealing.Secondly, the use of flexible pole shoe, the small―gap suture that cannot reach because of security reason of making over even becomes possibility in zero clearance, improve the performance of sealing to a great extent, and under the ductility of flexible pole shoe not only effectively can solve small―gap suture, problem of colliding with between rotating shaft and pole shoe, reduce magnet fluid sealing processing and assembling difficulty, simultaneously also can between equipment start-stop when moment interference, keep sealability constant, effectively increase usability and the Security of magnet fluid sealing, expand the application area of Magneticfluid Seal Technique further.
Accompanying drawing explanation
Fig. 1 flexible pole shoe device for sealing magnetic fluid structural drawing.
In Fig. 1: seal ring on the left of seal ring, 14 lock screws, 15 on the right side of 1 shell, 2 pads, 3 end caps, 4 screws, 5 permanent magnets, 6 flexible pole shoes, 7 soft irons, 8 header boards, 9 backboards, 10 seal rings, 11 axle sleeves, 12 coatings, 13.
Embodiment
Be that the invention will be further described for embodiment with accompanying drawing: obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, belongs to the scope of protection of the invention.
Embodiment 1
Flexible pole shoe device for sealing magnetic fluid, as Fig. 1, this device comprises: shell 1, pad 2, end cap 3, screw 4, permanent magnet 5, flexible pole shoe 6, soft iron 7, header board 8, backboard 9, seal ring 10, axle sleeve 11, coating 12, right side seal ring 13, lock screw 14 and left side seal ring 15;
Connection between each several part forming this device:
Described permanent magnet about 5 two ends are respectively furnished with one group of seal element, and seal element comprises soft iron 7, backboard 9, flexible pole shoe 6 and header board 8 successively, and form entirety by welding, the mode such as gluing between seal element, permanent magnet 5 and two ends, left and right contact with soft iron 7;
Described left and right side seal ring 13,15 is arranged in the seal groove of header board 8 cylindrical of two groups of seal elements;
Described end cap 3 is arranged on the right side of shell 1, and end cap 3 and shell 1 is fixed by screw 4, makes each part axial location of enclosure;
Described pad 2 is arranged between end cap 3 and shell 1;
Described axle sleeve 11 and coating 12 by welding, the mode such as gluing, spraying forms entirety;
Described seal ring 10 is arranged in the seal groove of axle sleeve 11 inner circle;
Described axle sleeve 11 is fixed in rotating shaft by lock screw 14;
Described shell 1 adopts non-permeable material, as stainless steel, and is processed with the tapped hole of mounting screw 4;
Described end cap 3 adopts non-permeable material, as stainless steel, and is processed with the through hole of attachment screw 4;
The material that described flexible pole shoe 6 adopts magnetic property excellent, as permally, flexible pole shoe 6 is close-packed arrays and has certain thickness flexible tow, and tow forms entirety by modes such as clip or gluing, welding, and its length can make its end and coating 12 surface contact;
The material that described soft iron 7 adopts magnetic property good, as electrical pure iron;
Described header board 8 adopts non-permeable material, as stainless steel, there is certain interval between its inner circle and coating 12 surface, and its Excircle machining has the annular seal grooves installing left and right side seal ring 13,15;
Described backboard 9 adopts non-permeable material, as stainless steel, there is certain interval between its inner circle and coating 12 surface;
The material that described axle sleeve 11 adopts magnetic property good, as electrical pure iron, its inner circle is processed with the annular seal grooves installing seal ring 10, and is processed with the tapped hole installing lock screw 14;
Described coating 12 adopts non-permeable material, as copper, pottery;
Ru-Fe-Mn selected by described permanent magnet 5.
Solve existing device for sealing magnetic fluid bearing capacity limited, processing and assembling difficulty is large, and required precision is high, easily collides with between pole tooth and rotating shaft, and the problems such as " seize " phenomenon occur.During flexible pole shoe device for sealing magnetic fluid work, magnetic induction line, from permanent magnet, forms magnetic circuit through soft iron, flexible pole shoe, coating and axle sleeve.Magnetic fluid is assembled and is adsorbed on around the flexible pole shoe between baffle plate and rotating shaft surface and in gap, plays the effect of bearing sealing medium axial pressure and shutoff medium leakage, thus realizes sealing function.
Claims (5)
1. a flexible pole shoe device for sealing magnetic fluid, it is characterized in that, comprising: shell (1), pad (2), end cap (3), screw (4), permanent magnet (5), flexible pole shoe (6), soft iron (7), header board (8), backboard (9), seal ring (10), axle sleeve (11), coating (12), right side seal ring (13), left side seal ring (15);
Annexation between each several part forming this device: described seal ring (10) is arranged in the seal groove of axle sleeve (11) internal surface, the outer surface of axle sleeve (11) has one deck coating (12), there is an annular permanent magnet (5) periphery of axle sleeve (11), annular permanent magnet (5) is coaxial with axle sleeve (11), and between annular permanent magnet (5) and axle sleeve (11), there is certain space, annular permanent magnet (5) left and right both ends of the surface are respectively furnished with one group of seal element, seal element is ring structure, seal element comprises soft iron (7), backboard (9), flexible pole shoe (6) and header board (8), be composed of a fixed connection between seal element entirety, permanent magnet (5) left and right both ends of the surface contact with soft iron (7), be backboard (9) in the ring of soft iron (7), backboard (9) does not contact with axle sleeve (11), has space, soft iron (7) flushes with the inner ring surface of permanent magnet (5) with the surface of contact of backboard (9), flexible pole shoe (6) is at soft iron (7) and the exterior edge face of backboard (9), flexible pole shoe (6) adopts magnetic conductive material, flexible pole shoe (6) is the ring of the flexible tow composition of tight ordered arrangement, the direction of tow is along the radial direction of ring, flexible pole shoe (6) has certain axial thickness, tow forms entirety, the inner ring surface of flexible pole shoe (6) and coating (12) surface contact by modes such as clip or gluing, welding, the exterior edge face of flexible pole shoe (6) is header board (8), the exterior edge face of the header board (8) of the left and right sides is respectively shell (1) and end cap (3), shell (1) is fixedly connected with by screw and nut with end cap (3), by permanent magnet (5), flexible pole shoe (6), soft iron (7), header board (8), backboard, (9 are fastened in the cavity of shell (1), and shell (1) is fixed by screws on axle sleeve (11),
Pad (2) is arranged in the joint between end cap (3) and shell (1); Coating (12) adopts non-permeable material; Header board (8) adopts non-permeable material; Backboard (9) adopts non-permeable material, and axle sleeve (11) adopts magnetic conductive material.
2. according to the flexible pole shoe device for sealing magnetic fluid of the one of claim 1, it is characterized in that, to be composed of a fixed connection entirety by the mode such as to weld, gluing between seal element.
3. according to the flexible pole shoe device for sealing magnetic fluid of the one of claim 1, it is characterized in that, described end cap (3) is arranged on shell (1) right side, and by screw (4), end cap (3) and shell (1) are fixed, make the inner each part axial location of shell (1).
4. according to the flexible pole shoe device for sealing magnetic fluid of the one of claim 1, it is characterized in that, described axle sleeve (11) and coating (12) are passed through to weld, mode that is gluing, that spray forms entirety.
5., according to the flexible pole shoe device for sealing magnetic fluid of the one of claim 1, it is characterized in that, axle sleeve (11) is fixed in rotating shaft by lock screw (14).
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 true CN105202198A (en) | 2015-12-30 |
| CN105202198B CN105202198B (en) | 2017-09-22 |
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| 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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| CN (1) | CN105202198B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105972219A (en) * | 2016-07-29 | 2016-09-28 | 广西科技大学 | Staggered tooth end face type magnetic fluid sealing device |
| CN106812948A (en) * | 2017-02-23 | 2017-06-09 | 北京交通大学 | The variable magnetic fluid seal device of seal clearance |
| CN107542936A (en) * | 2016-06-26 | 2018-01-05 | 哈尔滨盛迪电力设备有限公司 | The double air ring sealing devices of magnetic suspension positioning |
| CN108616187A (en) * | 2018-07-13 | 2018-10-02 | 苏州启承动能科技有限公司 | A kind of vacuum water cooling high speed motor |
| CN110081177A (en) * | 2019-05-06 | 2019-08-02 | 北京化工大学 | A kind of sealing device and bearing housing system |
| CN110553040A (en) * | 2019-09-08 | 2019-12-10 | 北京化工大学 | spiral magnetic fluid sealing structure for oil-gas two-phase lubricating bearing box |
| CN111503275A (en) * | 2020-04-30 | 2020-08-07 | 大连理工大学 | Tunnel boring machine main drive rubber-magnetic fluid coupling sealing device and mounting method |
| CN111593344A (en) * | 2020-07-10 | 2020-08-28 | 广东工业大学 | Titanium alloy surface high-permeability wear-resistant coating material for magnetic fluid sealing and preparation method and application thereof |
| CN112049937A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Double-coating magnetic liquid sealing device |
| CN113639046A (en) * | 2021-08-16 | 2021-11-12 | 清华大学 | Magnetic liquid sealing device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542936B (en) * | 2016-06-26 | 2024-02-09 | 哈尔滨盛迪电力设备有限公司 | Magnetic suspension positioning double-airflow ring sealing device |
| CN107542936A (en) * | 2016-06-26 | 2018-01-05 | 哈尔滨盛迪电力设备有限公司 | The double air ring sealing devices of magnetic suspension positioning |
| CN105972219A (en) * | 2016-07-29 | 2016-09-28 | 广西科技大学 | Staggered tooth end face type magnetic fluid sealing device |
| CN106812948A (en) * | 2017-02-23 | 2017-06-09 | 北京交通大学 | The variable magnetic fluid seal device of seal clearance |
| CN106812948B (en) * | 2017-02-23 | 2018-05-04 | 北京交通大学 | The variable magnetic fluid seal device of seal clearance |
| CN108616187A (en) * | 2018-07-13 | 2018-10-02 | 苏州启承动能科技有限公司 | A kind of vacuum water cooling high speed motor |
| CN110081177A (en) * | 2019-05-06 | 2019-08-02 | 北京化工大学 | A kind of sealing device and bearing housing system |
| CN110553040A (en) * | 2019-09-08 | 2019-12-10 | 北京化工大学 | spiral magnetic fluid sealing structure for oil-gas two-phase lubricating bearing box |
| CN111503275A (en) * | 2020-04-30 | 2020-08-07 | 大连理工大学 | Tunnel boring machine main drive rubber-magnetic fluid coupling sealing device and mounting method |
| CN111593344A (en) * | 2020-07-10 | 2020-08-28 | 广东工业大学 | Titanium alloy surface high-permeability wear-resistant coating material for magnetic fluid sealing and preparation method and application thereof |
| CN111593344B (en) * | 2020-07-10 | 2022-04-22 | 广东工业大学 | Titanium alloy surface high-permeability wear-resistant coating material for magnetic fluid sealing and preparation method and application thereof |
| CN112049937A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Double-coating magnetic liquid sealing device |
| CN112049937B (en) * | 2020-09-08 | 2021-05-18 | 清华大学 | Double-coating magnetic liquid sealing device |
| CN113639046A (en) * | 2021-08-16 | 2021-11-12 | 清华大学 | Magnetic liquid sealing device |
| CN113639046B (en) * | 2021-08-16 | 2022-04-12 | 清华大学 | Magnetic liquid sealing device |
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