CN110206891A - Split mechanical seal magnetic liquid auxiliary seal ring - Google Patents
Split mechanical seal magnetic liquid auxiliary seal ring Download PDFInfo
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- CN110206891A CN110206891A CN201910607384.6A CN201910607384A CN110206891A CN 110206891 A CN110206891 A CN 110206891A CN 201910607384 A CN201910607384 A CN 201910607384A CN 110206891 A CN110206891 A CN 110206891A
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- ring
- pole shoe
- stationary
- pole
- permanent magnet
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 146
- 239000007788 liquid Substances 0.000 title claims abstract description 81
- 230000007246 mechanism Effects 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims description 47
- 239000000203 mixture Substances 0.000 claims description 20
- 239000011553 magnetic fluid Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 210000003781 tooth socket Anatomy 0.000 claims description 13
- 239000013589 supplement Substances 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 230000000153 supplemental effect Effects 0.000 claims description 2
- 238000003032 molecular docking Methods 0.000 claims 1
- 150000003839 salts Chemical class 0.000 abstract description 10
- 229920001971 elastomer Polymers 0.000 abstract description 2
- 238000002224 dissection Methods 0.000 description 13
- 239000012530 fluid Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 5
- 229920000297 Rayon Polymers 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002518 CoFe2O4 Inorganic materials 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 208000006670 Multiple fractures Diseases 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical group [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 210000001847 jaw Anatomy 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3444—Pressing means by magnetic attraction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
This patent provides a kind of Split mechanical seal magnetic liquid auxiliary seal ring, for substituting tradition O shape rubber seal between rotating ring and shaft and between stationary ring and stationary seat, prevents the intracavitary medium of pump for liquid salts along axial leakage.It is made of shaft, the first and second pole shoe, the first and second permanent magnet, rotating ring, stationary ring, stationary seat, the first and second magnetic force generating mechanism is constituted in nested first and second pole shoe of two permanent magnet semi-rings of first and second permanent magnet, the first and second magnetic force generating mechanism is nested in inside rotating ring, the outer side ring surface of stationary ring；Drive sleeve and shaft position, and rotating seat and drive sleeve are in circumferential direction and radial positioning；Rotating seat and rotating ring circumferential direction and radial positioning；Rotating ring is circumferentially fixed relative to shaft, and radial clearance is constant, the radial seal clearance constant between the pole tooth and shaft outer surface of the first pole shoe；Stationary ring and stationary seat circumferential direction and radial positioning, the radial seal clearance constant between the pole tooth and stationary ring base inner surface of the second pole shoe.
Description
Technical field
This technology belongs to technical field of mechanical, is related to Split mechanical seal and magnetic fluid sealing technology, especially
The auxiliary static seal being suitable as between fused salt core main pump shell and dissection type stationary ring, dissection type rotating ring and shaft.
Background technique
Since this century, since the worldwide energy and resource scarcity degree are on the rise, greenhouse gases effect etc.
Relevant environment problem becomes increasingly conspicuous, thus seek sustainable, safety and stability and the environmental-friendly energy receive various countries concern.
Generation Ⅳ international symposium (GIF) policy group has issued Technology Roadmap within 2002, proposes almost all nuclear energy countries
The 6 kinds of heap-type received, wherein 3 kinds are sodium-cooled fast reactor, Lead cooled fast breeder reactor and gas cooled fast reactor respectively, another 3 kinds be ultra-high-temperature reactor, super face
Boundary's water-water reactor and molten salt reactor.Wherein, molten salt reactor because high-efficient, waste discharge is few, in the advantages such as core region pressure is low by generation
The concern of various countries, boundary.
According to the prior art, pump for liquid salts uses for reference light water reactor (including presurized water reactor and boiling-water reactor), heavy water reactor, gas cooled graphite moderated reactor
3rd level sealing, i.e., the dry gas made the double mechanical seal of obstruction fluid using lubricating oil or gas is used to make obstruction fluid are close
Envelope seals to realize.However, the end face frictional wear that the relative rotation between mechanical sealing linkage ring, stationary ring generates, and auxiliary
The aging of seal O-ring can all cause mechanical seal to be failed；In this case, it is necessary to replacement or detachable maintaining mechanical seal.
Since the existing mechanical seal used is monoblock type, the matching piece of shaft end, project amount must be dismantled when replacing vulnerable part
Greatly, time-consuming, costly, therefore, begins one's study Split mechanical seal from the nineties with regard to someone, expectation is replaced with this.
However, there are two big technological difficulties for the realization of Split mechanical seal: first is that the sealing at subdivision ring connection interface, second is that dissection type
The design of auxiliary seal ring.The subdivision ring connection interfacial seal problem of Split mechanical seal tries hard to solve by another patent
Certainly；The present invention mainly inquires into the design problem of dissection type auxiliary seal ring.
From existing well-known technique it is found that the auxiliary seal ring of Split mechanical seal all uses dissection type O-ring, dissection type
There are many forms for the split surface connecting joint of O-ring, and one is bridging arrangements, and sealing ring is cut into radial section
(Bessette,R.F.,Simmons,L.K.,Proulx,G.S.and Blow,T.S..Fully split cartridge
Mechanical seal assembly:US, 5662340 [P] .1996-4-8.) and scarf (Escue
J.W..Rotatable shaft sealing assembly with flowable material spacer means:US,
4575098 [P] .1986-03-11.), with gluing (Azibert H.V., Ruan B., Wu S.F., Clark together
M.S..Split mechanical face seal with negative pressure control system:US,
6068264 [P] .2000-05-30.), install convenient, but there are base material and viscoses for the dissection type O-ring of this connection
Mechanical property is different, compressive deformation is different, and initiation contacts uneven or temperature change change viscose property with sealing ring, shell and causes
The problems such as making its failure, poor reliability；Another is connected structure, i.e., port one end is pit, and the other end is boss, such as spherical
Head grafting (Sato T., Okubo H..Split mechancial seal:US, 2010/0264597 A1 [P] .2010-10-
21；Wu Peng, Fu Guotao, foline is red, Wu great Zhuan Split mechanical seal and the Quimby pump equipped with Split mechanical seal: in
State, 103388580A [P] .2013-11-13.), (Yang Qiming, Zhou Yan, Ma Xingchang, Juventus minister in ancient times dissection type are mechanical for conical head grafting
Sealing: China, 2742241 [P] .2005-11-23.), belt carcass nose cone grafting, fracture multiple sections bumps are this with respect to grafting
The dissection type O-ring one side manufacturing process of connection is complicated, on the other hand in grafting port not gluing, can cut because of boss
Face size little Yi causes fracture failure and cooperation port gap to increase and generate leakage；The third be buckle structure (Yang Qiming,
Zhang Yuan, Yang Xuwen, Zong Yan have the dissection mechanical sealing ring of buckle-shaped structure: China, 201162822 [P] .2008-12-
10.), the occlusion of multiple tooth socket and viscose is applied at buckle teeth and catching groove increase adhesion strength, but this connection
Dissection type O-ring is because the cooperation sectional dimension little Yi of tooth socket causes viscose face to tear, while the design of multiple tooth socket increases manufacture
It is difficult.
Objectively, the duty parameters such as the lower sealed medium pressure of fused salt core main pump and not high temperature, for magnetism
The application of fluid sealing techniques provides good conditioned basic；On the other hand, magnetic liquid sealing structure is simple, the service life is long,
Zero leakage, good reliability, pollution-free, easy to use, the main shaft seal for fused salt core main pump provides new way.But magnetic
The sealability of property hydraulic seal is highly sensitive to the size and its stability of seal clearance.Existing pump for liquid salts is vertical, upper end
It is fixed for end face bearing, lower end is guiding sliding supported condition.For major diameter pump shaft, bearing unilateral gap reaches 0.3mm, fortune
When turning in the unbalanced weight and impeller of impeller and pump shaft fluid mass imbalance, can all cause shaft to generate biggish radial direction
Bounce, it is difficult to guarantee the radial clearance size and its stability between the pump shaft and pole shoe of magnetic fluid sealing requirement, this
Leading to magnetic fluid sealing technology so far not can apply on sodium-cooled fast reactor core main pump yet.
Summary of the invention
Insufficient for the above-mentioned prior art, it is close that this patent is intended to provide a kind of Split mechanical seal magnetic liquid auxiliary
Seal prevents pump for liquid salts for substituting tradition O shape rubber seal between rotating ring and shaft and between stationary ring and stationary seat
Intracavitary medium is along axial leakage.
To guarantee the split surface installation of Split mechanical seal precisely, installation method and installation ancillary equipment be can refer to
State patent CN103968077A.
The technical solution of this patent is: a kind of Split mechanical seal magnetic liquid auxiliary seal ring, by shaft
1, the first pole shoe 7, the first permanent magnet 8, rotating ring 10, stationary ring 11, the second pole shoe 12, the second permanent magnet 13, stationary seat 15 form,
Be characterized in: two permanent magnet semi-rings of composition the first permanent magnet of circular ring shape 8 are respectively nested in the two of composition the first pole shoe of circular ring shape 7
The first magnetic force generating mechanism is constituted on the outside of a pole shoe semi-ring in annular groove, the first magnetic force generating mechanism is made of two combination semi-rings,
Two combination semi-rings of the first magnetic force generating mechanism are nested in the two semi-rings inside annular groove cooperation for being combined into rotating ring 10 respectively
Inside rotating ring；Two permanent magnet semi-rings of composition the second permanent magnet of circular ring shape 13 are respectively nested in composition the second pole shoe of circular ring shape 12
Two pole shoe semi-rings on the outside of the second magnetic force generating mechanism is constituted in annular groove, the second magnetic force generating mechanism is by two combination semi-ring groups
At two combination semi-rings of the second magnetic force generating mechanism are nested with annular groove cooperation on the outside of two semi-rings for being combined into stationary ring 11 respectively
The side ring surface outside stationary ring；
The inside diameter surface of first pole shoe 7 is axially distributed two groups of spaced pole teeth and tooth socket, the second pole shoe
12 external diameter surface is axially distributed two groups of spaced pole teeth and a tooth socket, and every group has 4~6, pole tooth of axial alignment,
1~3mm of the facewidth, 1~3mm of groove width；First permanent magnet 8 and the second permanent magnet 13 in axial direction magnetize, permanent magnet magnetic force,
The specific number of pole tooth and arrangement regulation are according to practical application condition design on pole shoe；
There are gaps, the pole tooth and stationary seat of the second pole shoe 12 between 1 outer surface of pole tooth and shaft of first pole shoe 8
There are gap between 15 inner surfaces, gap location is marked with magnetic liquid, encloses and fills out in pole tooth rim in magneticaction magnetic liquid adsorption
A circle circle magnetic fluid sealing ring is formed full of seal clearance；
Drive sleeve 3 is connected by key and is positioned with inner hole surface and shaft 1, in circumferential direction and diameter between rotating seat 6 and drive sleeve 3
To cooperation positioning；Rotating seat 6 and rotating ring 10 are circumferential using the fixed realization positioning of screws clamp, radial to use 10 outside cylinder of rotating ring
Face and the cooperation of rotating seat 6 position；Then, rotating ring 10 is circumferentially fixed relative to shaft 1, and radial clearance is constant, the first pole shoe 7
1 outer surface of pole tooth and shaft between radial seal clearance constant；Stationary ring 11 and stationary seat 15 are circumferential using screw clamp fastening
It is fixed to realize positioning, radial to position using external cylindrical surface and stationary seat 15 cooperation of stationary ring 11, the pole tooth and stationary ring of the second pole shoe 12
Radial seal clearance constant between 15 inner surfaces of seat.
Between 1 outer surface of pole tooth and shaft of first pole shoe 8,15 inner surface of the pole tooth of the second pole shoe 12 and stationary seat
Between seal clearance be 0.05~0.2mm.
Two combination semi-rings of the first magnetic force generating mechanism are combined by lap joint form, and two of the first permanent magnet 8
The interface of permanent magnet semi-ring and the interface of two pole shoe semi-rings of the first pole shoe 7 are staggered circumferentially；Machine occurs for the second magnetic force
Two combination semi-rings of structure are combined by lap joint form, the interface of two permanent magnet semi-rings of the second permanent magnet 13 and the second pole
The interface of two pole shoe semi-rings of boots 12 is staggered circumferentially.It can guarantee the magnetic field at the interface of two pole shoe semi-rings in this way
Intensity guarantees that the interface of two pole shoe semi-rings is in the complete reliable magnet fluid sealing of circumferential formation.
Have on the rotating seat 6, rotating ring 10 and the first pole shoe 7 mutual connection, for the first pole shoe 8 pole tooth with
First liquid injection hole 9 of the gap supplement magnetic liquid between 1 outer surface of shaft has on stationary seat 15 for the second pole shoe 12
Second liquid injection hole 14 of the gap supplement magnetic liquid between 15 inner surface of pole tooth and stationary seat, first when non-supplemental magnetic liquid
Liquid injection hole 9 and the second liquid injection hole 14 are blocked with screw.
Axially, one group of spaced pole tooth and tooth socket respectively are located in the two sides of first permanent magnet 8
On first pole shoe, 7 inside diameter surface；Respectively there are one group of spaced pole tooth and tooth socket to be located in the two sides of second permanent magnet 13
On second pole shoe, 12 external diameter surface.
It is respectively set on the rotating seat 6 and stationary seat 15 there are four threaded hole, forms two semi-rings and group of rotating ring 10
At two platforms 16 parallel with split surface are machined on two and half ring flanges of stationary ring 11 respectively.When installation, first having assembled
The rotating ring 10 for having the first magnetic force generating mechanism and the stationary ring 11 for being assembled with the second magnetic force generating mechanism are pushed into rotating seat 6 and quiet respectively
In the hole of ring seat 15, and it is respectively aligned to each threaded hole on rotating seat 6 and stationary seat 15 on 11 flange of rotating ring 10 and stationary ring
Platform 16, guaranteeing that two semi-ring end faces remain complete circular planes and vertical with main-shaft axis (method is referring to Chinese
Patent CN103968077A) it is screwed into the threaded hole on rotating seat 6 and stationary seat 15 to compress to form respectively with four screws afterwards and be moved
Two semi-rings of ring 10 and two semi-rings of composition stationary ring 11, four screw-driving torques are equal, make rotating ring split surface and stationary ring
Pressure required for cover is kept is cutd open, while also ensuring that rotating seat 6 is circumferentially fixed with stationary ring 11 with rotating ring 10, stationary seat 15
And axial restraint.
There are three leakage paths altogether for the Split mechanical seal of the magnetic fluid auxiliary seal: rotating ring 10 and shaft 1
Between, between stationary ring 11 and stationary seat 15, between 11 seal face of rotating ring 10 and stationary ring, the first two leakage path belongs to quiet close
Envelope is sealed with magnetic fluid sealing technology, and magnetic liquid forms the liquid of a circle circle under the magneticaction that magnetic force mechanism generates
" O-ring seals "；Rotating ring 10 and stationary ring belong to dynamic sealing between 11 end face, left by pressure medium in seal chamber and rotating seat 6
The spring force at end is allowed to fit closely to realize sealing to rotating ring 10 and 11 sealing surface applied force of stationary ring.
Magnetic liquid formula auxiliary seal ring magnetic fluid sealing principle: one group of magnetic force generating mechanism axial symmetry is arranged in dynamic
On ring or stationary ring, and magnetic liquid is filled between magnetic force generating mechanism and shaft and shell, the effect of magnetic force in magnetic field
Under, liquid fluidity and magnetic action of the magnetic liquid due to itself are uniformly distributed therein, and are made by constant magnetic force
With being stabilized, is formed and sealed medium is hindered to flow through the ability between magnetic force generating mechanism and shaft and shell.
Magnetic liquid is ferromagnetic material such as (Fe3O4、CoFe2O4、r-Fe2O3) etc. particle surfaces adsorb the work of a upper bed boundary
Property agent, this activating agent can be such that it is uniformly and stably dispersed in base fluid, form a kind of colloid containing magnetic retention particle
Solution；Magnetic force generating mechanism mainly includes permanent magnet and pole shoe, and pole tooth and tooth socket, magnetic force generating mechanism and sealing are provided on pole shoe
Surface has certain gapped magnetic field, and magnetic fluid sealing ability reduces with the increase of seal clearance, and seal clearance is 0.05
Effect preferably (the influence of Gu Jianming, Xu Yongxing, Lu Mingqi, Rui Jing Gap of Magnetic Fluid Seal on Seal Capacity when~0.2mm
[J] Shanghai communications university's journal, 1999 (03): 136-138.).
When magnetic liquid injects gapped magnetic field, around gapped magnetic field under the action of magnetic force, due to magnetic liquid itself
Liquid fluidity and magnetic action, gapped magnetic field can be full of magnetic liquid, and the annular design of gapped magnetic field can allow magnetic liquid
A kind of special magnetic liquid " O-ring " is formed in gapped magnetic field, since machine occurs for magnetic liquid self character and magnetic force
The structure of structure designs, which can be stabilized, and plays good sealing function to sealing medium.Experiment
It proves, in order to improve integral sealing effect and bearing capacity, multiple magnetic circuits can be constructed in magnetic liquid sealing structure,
I.e. multistage magnetic liquid sealing structure, when sealing, will have differential pressure action, when pressure acts on magnetic liquid " O-ring "
Magnetic liquid can be deviated slightly, the response due to magnetic fluid to external magnetic field, the magnetic liquid " O-ring " have keep and it is extensive
The characteristic of multiple reset condition, thereby produces the power of confrontation pressure difference, here it is the sealing functions of magnetic liquid formula auxiliary seal ring
Principle.On annular pole shoe, pole tooth and tooth socket interphase distribution, can simplified model calculate monopole and seal the seal pressure differential that can be born,
First calculate seal clearance magnetic pressure drop Fg, most strong further according to magnetic field under toothMagnetic field is most weak under slotThen the ultimate seal pressure difference of any level is Δ Pmax=Ms(Bmax-Bmin), the ultimate seal pressure difference of N grades of sealings
Calculated value Δ P=NMs(Bmax-Bmin).Magnetic fluid sealing pressure resistance formula can be released:
In formula: N --- the number of teeth of pole tooth；
Ms--- saturation magnetization；
ΔBi--- between the minimum and maximum magnetic induction intensity in the seal clearance between pole tooth and axial plane under the tooth of single-stage pole
Difference；
μ0--- initial permeability；
G --- seal clearance；
β --- inclination angle；
S --- groove width.
Thus formula is it can be concluded that the sealed pressure of magnetic liquid and performance, the number N of teeth of pole shoe, saturated magnetization of permanent magnet
Intensity MsAnd between the maximum magnetic field strength and minimum-B configuration intensity in the seal clearance between pole tooth and main shaft under the tooth of single-stage pole
Difference DELTA BiIt is closely related.It can analyze, as saturation magnetization MsIn seal clearance between pole tooth and main shaft under the tooth of single-stage pole
Maximum magnetic field strength and minimum-B configuration intensity between difference DELTA BiWhen remaining unchanged, the number N of teeth of pole shoe is more, sealing element
Voltage endurance capability is stronger；Maximum magnetic field strength under single-stage pole tooth in the seal clearance between the number N of teeth and pole tooth and main shaft of pole shoe
Difference DELTA B between minimum-B configuration intensityiWhen remaining unchanged, saturation magnetization MsBigger, the voltage endurance capability of sealing element is got over
By force；When the number N of teeth and saturation magnetization M of pole shoesWhen remaining unchanged, in the seal clearance between pole tooth and main shaft under the tooth of single-stage pole
Maximum magnetic field strength and minimum-B configuration intensity between difference DELTA BiBigger, the voltage endurance capability of sealing element is stronger.
This patent has the advantages and positive effects of:
(1) convenient installation and removal.As long as magnetic liquid is injected seal clearance, that is, complete sealing installation.Dissection type
In mechanical seal use process, when needing replacing subdivision ring, as long as the rotating ring for having magnetic force generating mechanism or stationary ring are removed, magnetic
Property sealing liquid just leave shaft and shell with magnetic force generating mechanism, that is, complete sealing disassembly.
(2) it is not influenced by shaft circular runout.Compared to the magnetic fluid sealing between traditional shaft and shell, originally
Patent effectively prevents the magnetic fluid sealing because caused by the radial seal gap of shaft eccentricity runout generation is excessive and fails.It is real
On border, the magnetic liquid auxiliary seal ring between rotating ring and shaft is that phantom ring and shaft rotate together, in diameter between three
Remain stationary upwards, and stationary ring, shell and its between magnetic liquid auxiliary seal ring, be also relatively stationary radially,
This is conducive to the sealing of magnetic liquid auxiliary seal ring；Shaft eccentricity runout generate radial displacement by dynamic and static ring contact jaw
The end face seal that face is constituted undertakes.
(3) outstanding dynamic and static ring tracing ability.For the Split mechanical seal of rotating ring back side setting spring, due in dynamic
Magnetic liquid auxiliary seal ring between ring and shaft or between stationary ring and stationary seat, when rotating ring is pasted close or remote from stationary ring,
Frictional force, that is, molecular attraction between shaft surface is almost nil, does not influence rotating ring and follows to stationary ring, improves dynamic and static ring end
The reliability of face sealing.
(4) zero leakage.With magnetic liquid formula auxiliary seal ring instead of between Split mechanical seal rotating ring and shaft and
The dissection type seal with O ring generallyd use between stationary ring and stationary seat, solves O-ring itself split surface gap and O-ring
Existing microchannel leakage problem, realizes the sealed medium between rotating ring and shaft, stationary ring and shell between contact surface
Zero leakage.
(5) long-life.Magnetic liquid be a kind of inertia, stabilization, low-vapor pressure the solution of particle colloid containing magnetic retention, tool
There is good physical property, can be stored in for a long time between rotating ring and main shaft and between stationary ring and shell, undertake sealing task.
(6) good self-healing capability.Magnetic fluid seal generates instantaneous overvoltage breakdown under normal circumstances or occurs inclined
When moving deformation, when pressure reduction is to sealing the degree that can bear, the response due to magnetic fluid to magnetic field, the magnetism under the tooth of pole
Pressure-resistant liquid film can self " healing " reset, have good repair ability.
Detailed description of the invention
This patent is further illustrated in the following with reference to the drawings and specific embodiments.
Fig. 1 is Split mechanical seal overall structure sectional view；
Fig. 2 is the first magnetic force generating mechanism perspective view；
Fig. 3 is a combination semi-ring perspective view of the first magnetic force generating mechanism；
Fig. 4 is the second magnetic force generating mechanism perspective view；
Fig. 5 is a combination semi-ring perspective view of the second magnetic force generating mechanism；
Fig. 6 is the first magnetic force generating mechanism magnetic force circular route schematic diagram；
Fig. 7 is the second magnetic force generating mechanism magnetic force circular route schematic diagram；
Fig. 8 is the split surface figure for forming one of subdivision ring (semi-ring) of rotating ring；
Fig. 9 is two subdivision ring constitutional diagrams of rotating ring；
Figure 10 is the split surface figure for forming one of subdivision ring (semi-ring) of stationary ring；
Figure 11 is two subdivision ring constitutional diagrams of stationary ring；
Figure 12 is the position of platform schematic diagram on dynamic and static ring flange；
Figure 13 is 3 right view of drive sleeve；
Figure 14 is a pole tooth magnetic field division model；
In figure: 1-shaft, 2-keys, 3-drive sleeves, 4-spring bases, 5-springs, 6-rotating seats, the 7-the first pole shoe
(two pole shoe semi-ring compositions), the 8-the first permanent magnet (two permanent magnet semi-ring compositions), the 9-the first liquid injection hole, 10-rotating rings
(two semi-ring compositions), 11-stationary rings (two semi-ring compositions), the 12-the second pole shoe (two pole shoe semi-ring compositions), 13-the second
Permanent magnet (two permanent magnet semi-ring compositions), the 14-the second liquid injection hole, 15-stationary seats, 16-platforms, 17-fins
Specific embodiment
In order to the features described above and advantage of clearer description this patent, with reference to the accompanying drawing to the specific of this patent
Embodiment is further detailed.
This Split mechanical seal magnetic liquid auxiliary seal ring is installed in shaft 1, its step are as follows:
Two permanent magnet semi-rings for forming the first permanent magnet of circular ring shape 8 are first passed through interference fit respectively and are nested in by step 1
It forms and constitutes the first magnetic force generating mechanism on the outside of two pole shoe semi-rings of the first pole shoe of circular ring shape 7 in annular groove, the first magnetic force occurs
Mechanism is made of two combination semi-rings, then by two combination semi-rings of the first magnetic force generating mechanism respectively be combined into rotating ring 10
Annular groove interference fit is nested in side ring surface in rotating ring on the inside of two semi-rings, at this time it is noted that by connection rotating seat 6 and the first pole shoe 7
9 channel alignment of the first liquid injection hole, so just assembled first of rotating ring magnetic liquid auxiliary seal ring；
Step 2, that two permanent magnet semi-rings for forming the second permanent magnet of circular ring shape 13 are first passed through interference fit respectively is nested
The second magnetic force generating mechanism, the second magnetic force hair are constituted in annular groove on the outside of two pole shoe semi-rings of composition the second pole shoe of circular ring shape 12
Life structure is made of two combination semi-rings, then by two combination semi-rings of the second magnetic force generating mechanism respectively be combined into stationary ring 11
Two semi-rings on the outside of annular groove interference fit be nested in the outer side ring surface of stationary ring, so just assembled second stationary ring magnetism liquid
Body auxiliary seal ring；
Key 2 is first mounted in the keyway of shaft 1 by step 3, and then drive sleeve 3 is set on axis 1,3 bottom of drive sleeve
Keyway and key 2 cooperate, and left end inner hole surface and 1 outer peripheral surface of the shaft cooperation of drive sleeve 3 position.Then it will be equally spaced equipped with one week
The spring base 4 of spring 5 be installed to inside drive sleeve 3, then rotating seat 6 is installed to inside drive sleeve 3.Rotating seat 6 and transmission
Matched by groove axially extending on 6 left side external cylindrical surface of rotating seat with the fin 17 on 3 right side inner hole wall of drive sleeve between set 3
Conjunction realization is circumferentially positioned, while the radial direction of rotating seat 6 and drive sleeve 3 uses the right side of rotating seat 6 left side external cylindrical surface and drive sleeve 3
The positioning of side inner hole.5 left end of spring holds out against spring base 4 and fits closely spring base 4 with bottom in drive sleeve 3,5 right end of spring
Rotating seat 6 is held out against, stationary seat 15 is finally set in shaft 1 (drive sleeve 3, spring base 4, rotating seat 6 and stationary seat 15 and shaft
1 is clearance fit)；
Step 4, first by assemble composition 10 module of rotating ring 11 module of two semi-rings and composition stationary ring two semi-rings
Packet is respectively placed in the hole of rotating seat 6 and stationary seat 15, and make each screw thread on rotating seat 6 and stationary seat 15 on main shaft 1
Hole is respectively aligned to the platform 16 on 11 flange of rotating ring 10 and stationary ring, while also to guarantee rotating seat 6 and rotating ring 10 coconnected the
The alignment of one liquid injection hole 9 remains complete circular planes and (method reference vertical with main-shaft axis in two semi-ring end faces of guarantee
Chinese patent CN103968077A) it is screwed into compression group in the threaded hole on rotating seat 6 and stationary seat 15 respectively with four screws afterwards
At rotating ring 10 two semi-rings and composition stationary ring 11 two semi-rings, four screw-driving torques are equal, make rotating ring split surface and
Stationary ring cuts open pressure required for cover is kept, while also ensuring the circumferential direction of rotating seat 6 and rotating ring 10, stationary seat 15 and stationary ring 11
The inner hole of fixed and axial restraint, 10 left side external cylindrical surface of rotating ring and rotating seat is in radial positioning；Outside the right side of stationary ring 11
Cylindrical surface and 15 inner hole of stationary seat position.Then stationary seat 15 is pushed to be bonded stationary ring 11 and the seal face of rotating ring 10；
Step 5 injects appropriate magnetic liquid by the first liquid injection hole 9 and the second liquid injection hole 14, blocks note after the completion of filling
Fluid apertures.
Twice magnetic liquid auxiliary seal ring is formed after being installed as shown in Figure 1:, between shaft 1 and the first pole shoe 7 between
Gap realizes the static seal between rotating ring 10 and shaft 1 full of magnetic liquid, and gap is full of between stationary seat 15 and the second pole shoe 12
Magnetic liquid realizes the static seal between stationary ring 11 and stationary seat 15；Fig. 2 and Fig. 4 respectively indicates the first magnetic force generating mechanism and
Two magnetic force generating mechanisms；Fig. 6,7 represent the first magnetic force generating mechanism and the second magnetic force generating mechanism magnetic force circular route schematic diagram；
Fig. 9 and Figure 11, which is respectively indicated out, installs the corresponding rotating ring of such magnetic liquid formula auxiliary seal ring and static-ring structure schematic diagram.
A certain type Split mechanical seal auxiliary seal ring is chosen below, calculates its bearing capacity.Selection permanent magnet is neodymium
Iron boron G45EH, remanent magnetism Bf/ T is 1.28~1.36, intrinsic coercivity 2387Hcj/kA·m-1, coercivity 971HcB/kA·m-1, most
Big magnetic energy product 318~358 (BH)max/kA·m-3；Magnetic liquid model MF01 (Beijing Jiaotong University's preparation, Li Decai magnetism liquid
Body sealing theory and application Beijing [M]: Science Press, 2010.), base fluid is machine oil, and saturation magnetization Ms is 450Gs,
1.23 (kg/m of density3)×103, viscosity 20 (25 DEG C)/cP, initial permeability μ0For 0.8m/H；Assuming that the pole tooth facewidth a of pole shoe
For 1mm, the seal clearance g between pole tooth and axial plane is 0.1mm, and edge flux range takes m=2g.
Pole shoe is simplified, indicates a pole tooth magnetic field division model with Figure 14 to calculate magnetic pressure drop, according to figure by magnetic field
5 kinds of magnetic flux tubes are divided into, share a rectangle magnetic flux tube I, four 1/4 cylindrical bodies II, four 1/4 hollow cylinders III, four
1/8 sphere IV, four 1/8 hollow balls V calculate separately the magnetic pressure drop F of each magnetic flux tubeg。
Rectangle magnetic flux tube I:
1/4 cylindrical body II:
1/4 hollow cylinder III:
1/8 sphere IV:
1/8 hollow ball V:
Total magnetic pressure drop:
Fg=Fg1+4×(Fg2+Fg3+Fg4+Fg5)=0.0121
Magnetic field is most strong under tooth
Magnetic field is most weak under slot
Then the ultimate seal pressure difference of any level is Δ Pmax=Ms(Bmax-Bmin)=31113Pa
According to this programme magnetic boots one permanent magnet of structure or so, respectively there are four pole teeth, share eight grades of pole teeth, then:
Δ P=NMs(Bmax-Bmin)=0.25MPa
By fused salt core main pump mechanical seal pump chamber operating pressure 0.05MPa, it is known that this type of Split mechanical seal is used
The sealing performance of magnetic liquid auxiliary seal ring meets working condition requirement enough.
Claims (6)
1. a kind of Split mechanical seal magnetic liquid auxiliary seal ring, by shaft (1), the first pole shoe (7), the first permanent magnet
(8), rotating ring (10), stationary ring (11), the second pole shoe (12), the second permanent magnet (13), stationary seat (15) composition, it is characterized in that: group
Two poles of composition the first pole shoe of circular ring shape (7) are respectively nested at two permanent magnet semi-rings of the first permanent magnet of circular ring shape (8)
The first magnetic force generating mechanism is constituted on the outside of boots semi-ring in annular groove, the first magnetic force generating mechanism is made of two combination semi-rings, and first
Two combination semi-rings of magnetic force generating mechanism are nested in the two semi-rings inside annular groove cooperation for being combined into rotating ring (10) dynamic respectively
Inside ring；Two permanent magnet semi-rings of composition the second permanent magnet of circular ring shape (13) are respectively nested in composition the second pole shoe of circular ring shape
(12) the second magnetic force generating mechanism is constituted on the outside of two pole shoe semi-rings in annular groove, the second magnetic force generating mechanism is by two combinations half
Ring composition, two combination semi-rings of the second magnetic force generating mechanism respectively be combined into annular groove on the outside of two semi-rings of stationary ring (11) and match
Conjunction is nested in the outer side ring surface of stationary ring；
The inside diameter surface of first pole shoe (7) is axially distributed spaced pole tooth and tooth socket, the outer diameter of the second pole shoe (12)
Surface is axially distributed spaced pole tooth and tooth socket；First permanent magnet (8) and the second permanent magnet (13) are along axial side
To what is magnetized；
There are gaps, the pole tooth and stationary seat of the second pole shoe (12) between the pole tooth and shaft (1) outer surface of first pole shoe (7)
(15) there are gap between inner surface, gap location is marked with magnetic liquid, encloses in magneticaction magnetic liquid adsorption in pole tooth rim
It fills full seal clearance and forms a circle circle magnetic fluid sealing ring；
Drive sleeve (3) is connected by key and is positioned with inner hole surface and shaft (1), in circumferential direction between rotating seat (6) and drive sleeve (3)
With radial cooperation positioning；Rotating seat (6) and rotating ring (10) are radial to use rotating ring circumferentially using the fixed realization positioning of screws clamp
(10) external cylindrical surface and rotating seat (6) cooperation position；Then, rotating ring (10) is circumferentially fixed relative to shaft (1), and it is radial between
Gap is constant, the radial seal clearance constant between the pole tooth and shaft (1) outer surface of the first pole shoe (7)；Stationary ring (11) and stationary ring
Seat (15) is radial using the external cylindrical surface of stationary ring (11) and stationary seat (15) cooperation circumferentially using the fixed realization positioning of screws clamp
Positioning, the radial seal clearance constant between the pole tooth and stationary seat (15) inner surface of the second pole shoe (12).
2. a kind of Split mechanical seal magnetic liquid auxiliary seal ring as described in claim 1, it is characterized in that: the first pole
Sealing between the pole tooth and shaft (1) outer surface of boots (8), between the pole tooth of the second pole shoe (12) and stationary seat (15) inner surface
Gap is 0.05~0.2mm.
3. a kind of Split mechanical seal magnetic liquid auxiliary seal ring as described in claim 1, it is characterized in that: the first magnetic
Two combination semi-rings of power generating mechanism are combined by lap joint form, the docking of two permanent magnet semi-rings of the first permanent magnet (8)
Face and the interface of two pole shoe semi-rings of the first pole shoe (7) are staggered circumferentially；Two combinations half of second magnetic force generating mechanism
Ring is combined by lap joint form, and two of the interfaces of two permanent magnet semi-rings of the second permanent magnet (13) and the second pole shoe (12)
The interface of pole shoe semi-ring is staggered circumferentially.
4. a kind of Split mechanical seal magnetic liquid auxiliary seal ring as described in claim 1, it is characterized in that: rotating seat
(6), have on rotating ring (10) and the first pole shoe (7) mutual connection, for the pole tooth and shaft (1) to the first pole shoe (8) outside
The first liquid injection hole (9) of gap supplement magnetic liquid between surface has on stationary seat (15) for the second pole shoe (12)
The second liquid injection hole (14) of gap supplement magnetic liquid between pole tooth and stationary seat (15) inner surface, when non-supplemental magnetic liquid
First liquid injection hole (9) and the second liquid injection hole (14) are blocked with screw.
5. a kind of Split mechanical seal magnetic liquid auxiliary seal ring as described in claim 1, it is characterized in that: along axis
To direction, respectively there are one group of spaced pole tooth and tooth socket to be located at the first pole shoe (7) inside meter in the two sides of the first permanent magnet (8)
On face；Respectively there are one group of spaced pole tooth and tooth socket to be located at the second pole shoe (12) outer diameter table in the two sides of the second permanent magnet (13)
On face.
6. a kind of Split mechanical seal magnetic liquid auxiliary seal ring as described in claim 1, it is characterized in that: rotating ring
(10) it is bonded with stationary ring (11) seal face, centerline axis parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910607384.6A CN110206891B (en) | 2019-07-07 | 2019-07-07 | Magnetic liquid auxiliary sealing ring for split mechanical seal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910607384.6A CN110206891B (en) | 2019-07-07 | 2019-07-07 | Magnetic liquid auxiliary sealing ring for split mechanical seal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848393A (en) * | 2019-10-17 | 2020-02-28 | 浙江大学 | Multistage magnetic fluid sealing device |
| CN111366453A (en) * | 2020-04-29 | 2020-07-03 | 嘉善县科正建设工程检测有限公司 | Lower pressing plate circumferential sealing mechanism of universal testing machine |
| CN111677869A (en) * | 2020-06-10 | 2020-09-18 | 重庆齿轮箱有限责任公司 | Split type magnetic sealing device |
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| CN206860882U (en) * | 2017-03-21 | 2018-01-09 | 奉化市民联机械密封件有限公司 | A kind of buffer fluid flow path device structure of mechanical seal |
| CN210106603U (en) * | 2019-07-07 | 2020-02-21 | 南京林业大学 | Magnetic liquid auxiliary sealing ring for split mechanical seal |
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| CN2620799Y (en) * | 2003-06-25 | 2004-06-16 | 成都环想科技发展有限责任公司 | Magnetic liquid sealing device with magnetic liquid tank for sealing oil |
| CN202381387U (en) * | 2011-11-29 | 2012-08-15 | 宣伯民 | Pump mechanical sealing device with movable ring and fixed ring lubricated by magnetic oil |
| CN203670800U (en) * | 2014-01-17 | 2014-06-25 | 北京交通大学 | Magnetic liquid sealing device for sealing liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110848393A (en) * | 2019-10-17 | 2020-02-28 | 浙江大学 | Multistage magnetic fluid sealing device |
| CN111366453A (en) * | 2020-04-29 | 2020-07-03 | 嘉善县科正建设工程检测有限公司 | Lower pressing plate circumferential sealing mechanism of universal testing machine |
| CN111366453B (en) * | 2020-04-29 | 2022-07-01 | 嘉善县科正建设工程检测有限公司 | Lower pressing plate circumferential sealing mechanism of universal testing machine |
| CN111677869A (en) * | 2020-06-10 | 2020-09-18 | 重庆齿轮箱有限责任公司 | Split type magnetic sealing device |
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|---|---|
| CN110206891B (en) | 2024-08-20 |
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