CN104948743A - Novel multi-stage magnetic liquid sealing device - Google Patents
Novel multi-stage magnetic liquid sealing device Download PDFInfo
- Publication number
- CN104948743A CN104948743A CN201510333106.8A CN201510333106A CN104948743A CN 104948743 A CN104948743 A CN 104948743A CN 201510333106 A CN201510333106 A CN 201510333106A CN 104948743 A CN104948743 A CN 104948743A
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- seal
- ring
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- pressure
- shell
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- 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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- 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
-
- 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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
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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
The invention belongs to the field of mechanical engineering sealing, and discloses a novel multi-stage magnetic liquid sealing device. The novel multi-stage magnetic liquid sealing device successfully solves the problem that an existing sealing mode can not avoid mutual dissolution or mutual contamination between magnetic liquid and a liquid medium to be sealed. The device comprises a first-stage seal and a second-stage seal, wherein the first-stage seal is formed by a static ring (4), a pressure control valve (5), a movable ring (6), a spring (7), a spring base (8) and a set screw (9), and the second-stage seal is formed by a left pole shoe (10), a permanent magnet (11) and a right pole shoe (12). The first-stage seal is mainly used for sealing a liquid medium to be sealed in a seal cavity and preventing the liquid medium to be sealed from making contact with magnetic liquid (22), the second-stage seal is mainly used for sealing gas charged into a cavity between the movable ring (6) and the left pole shoe (10), and even when a shaft (21) does not rotate, the novel multi-stage magnetic liquid sealing device can reliably seal the liquid medium to be sealed.
Description
Technical field
The present invention relates to a kind of novel multistage-combination seal arrangement, belong to mechanical engineering technical field of sealing technology, be specially adapted to magnetic liquid and sealed medium can dissolve each other or hydraulic seal mutually under pollution condition.
Background technique
The sealing means of current main flow is mechanical seal, but zero leakage is not accomplished in simple mechanical seal, and easy greatly the generation sealing medium or working environment of wear extent is polluted, magnetic fluid sealing technology has zero leakage, without wearing and tearing due to it, life-span is long, advantages of simple structure and simple gradually use by increasing industry, but simple magnetic fluid sealing is when sealing medium is liquid, magnetic liquid easily with dissolved each other by the liquid sealed or pollute mutually.
Existing magnetic liquid sealing structure, as as described in documents 1 (Authorization Notice No. CN203670800U applies for a patent), described in documents 2 (publication number CN103775652A applies for a patent), described in documents 3 (publication number CN103759009A applies for a patent), described in documents 4 (publication number CN104165230A applies for a patent), described in documents 5 (application number CN201310556884.4 applies for a patent), described in documents 6 (the flat 4-119267A of application number JP applies for a patent), when seal fluid medium, the particular problem existed is as follows:
The magnetic fluid seal device for seal fluid described in documents 1 (Authorization Notice No. CN203670800U applies for a patent), this device comprises rotating shaft, sleeve sealing circle, fixing pin, axle sleeve, rotating ring, seal ring of moving ring, stationary ring, stationary ring seal ring, spring, left magnetism resistent ring, left pole shoe seal ring, left pole shoe, permanent magnet, right pole shoe, right pole shoe seal ring, right magnetism resistent ring, thread ending cover.This patent is by injecting magnetic liquid as buffer fluid, sealed medium and magnetic fluid sealing are separated, avoid being polluted magnetic fluid sealing by seal fluid, but, this patent cannot avoid magnetic liquid as buffer fluid to the pollution produced by seal fluid medium, does not therefore possess use value.
A kind of double helix magnetic fluid seal device described in documents 2 (publication number CN103775652A applies for a patent), this device comprises rotating shaft, shell, left hand screw cover, permanent magnet, right-hand screw cover, axle sleeve etc., this patent is concured by spiral seal and magnetic fluid sealing, although solve the sealing problem at machine startup and stopping phase, but this patent cannot avoid the contact by seal fluid medium and magnetic liquid in whole using process, thus this patent still cannot solve the problem of dissolving each other and polluting mutually by seal fluid medium and magnetic liquid.
A kind of fluid dynamic pressure type magnetic liquid seal device described in documents 3 (publication number CN103759009A applies for a patent), comprises screw, end cap, the first seal ring, circulation pipe arrangement inlet path, the magnetic liquid circulatory system, circulation pipe arrangement outlet pathway, the second seal ring, left pole shoe, annular permanent magnet, right pole shoe, the 3rd seal ring, shell, magnetism resistent ring, thread ending cover, axle sleeve, the first Cock screw, rotating ring, the second Cock screw, the 4th seal ring, the 5th seal ring, wedge-like fluid type groove, axle.This patent utilization feature of the high voltage bearing feature of hydrodynamic seal and magnetic fluid sealing zero leakage, although the zero leakage to hydraulic seal medium can be accomplished, but due to the contact by seal fluid medium and magnetic liquid cannot be avoided, the problem of dissolving each other and polluting mutually by seal fluid medium and magnetic liquid still cannot be solved.
Ventilated type air cooling magnetic fluid seal device described in documents 4 (publication number CN104165230A applies for a patent), this device comprises shell, first pole shoe, first permanent magnet, second pole shoe, second permanent magnet, 3rd pole shoe, axle sleeve, screw, end cap, ventilating joint, first rubber seal, second rubber seal, 3rd rubber seal, magnetic liquid, the effect of the gas that this patent passes into takes away heat to cool this device, " O " RunddichtringO formed by magnetic liquid can reach the seal request of zero leakage, but due to the contact by seal fluid medium and magnetic liquid cannot be avoided, still the problem of dissolving each other and polluting mutually by seal fluid medium and magnetic liquid cannot be solved.
Gas-filled type magnetic liquid rotating sealing device described in documents 5 (application number CN201310556884.4 applies for a patent), form this device to comprise: packing ring, shell, first pole shoe, first permanent magnet, second pole shoe, second permanent magnet, 3rd pole shoe, 3rd permanent magnet, 4th pole shoe, screw, back-up ring, jump ring, axle sleeve, 4th rubber seal, 3rd air flue, 3rd pneumatic control valve, 3rd rubber seal, second pneumatic control valve, second air flue, second rubber seal, first pneumatic control valve, first air flue, first rubber seal, rubber seal, this device is vacuumized by the cavity between the first permanent magnet internal diameter and axle sleeve external diameter, cavity between the second permanent magnet internal diameter and axle sleeve external diameter is filled with CO
2or inert gas, cavity between the 3rd permanent magnet internal diameter and axle sleeve external diameter vacuumizes, hazardous gas, especially explosive gas directly can not be contacted with air, solve security hidden trouble, but this device can only be used for sealing gas medium, when sealed medium is liquid, this device still cannot make magnetic liquid be separated with by seal fluid medium, therefore cannot avoid magnetic liquid and is dissolved each other by seal fluid medium or mutually pollute.
A kind of gas-filled type magnetic liquid rotating sealing device described in documents 6 (the flat 4-119267A of application number JP applies for a patent), this device forms gas-filled type magnetic fluid seal structure between and outside inner by the device that seals, prevent inner externally leakage by the dangerous work gas sealed from working the mischief, but this device can only be used for sealing gas medium, when sealed medium is liquid, the gas be filled with cannot form air film and form reliable sealing to liquid medium, even if can air film be formed, axle static and rotate time all need insufflation gas, therefore external air pump needs continuous firing, thus cause the lost of life and energy waste, therefore when sealed medium is liquid, this rotating sealing device does not have use value.
Therefore be badly in need of redesigning the structure of seal arrangement and improving, the seal request that torque is little, do not produce pollution to working environment, avoid magnetic liquid and dissolved each other by seal fluid medium or mutually pollute can be reached.
Summary of the invention
The technical issues that need to address of the present invention are, existing seal form due to himself structural imperfection, when sealing medium is liquid, magnetic liquid with to be dissolved each other by the liquid sealed or mutually pollute and cause seal failure.
The scheme that the technical problem that the present invention solves is taked is:
A kind of new multistage magnetic fluid seal device, this device comprise shell, clutch shaft bearing, limited ring, pressure controlled valve, stationary ring, rotating ring, spring, spring seat, Cock screw, left pole shoe, permanent magnet, right pole shoe, the first rubber seal, left snap ring, the first baffle ring, the second rubber seal, the 3rd rubber seal, the 4th rubber seal, the second baffle ring, the 5th rubber seal, axle, magnetic liquid, the 6th rubber seal, every magnetic baffle ring, the second bearing, right snap ring, end cap.
Described shell is the cylindrical shape with certain wall thickness, one end is processed with flange plate, the end face of flange plate is processed with seal groove, the surrounding of flange plate is evenly processed with four through holes, the other end of shell is processed with internal thread, the cylindrical outer surface of frame is evenly processed with 4 ~ 8 through holes, through hole is connected with the lower interface of pressure controlled valve, and the upper interface of pressure controlled valve is connected with external pressure pump; Described pressure controlled valve is made up of control valve and pressure transducer, and wherein pressure transducer has two probes to be respectively used to measure by the pressure of seal fluid and the gas pressure in the through hole be filled with on shell.When axle is static, pressure controlled valve does not work, in closed state; When axle rotating speed increases gradually, the valve of pressure controlled valve is opening state, simultaneously, external pressure pump starts supply gas in the through hole on shell, detected by the pressure difference between the gas in the through hole on seal fluid and shell by pressure transducer, make the gas pressure in the through hole on shell be more than or equal to all the time after spiral chute supercharging by the pressure of seal fluid, this pressure difference value is preferably less than 0.1Pa.
The external cylindrical surface of described stationary ring is processed with seal groove for installing rubber seal, cylindrical outer surface and right side plan are all processed with in 180 degree of equally distributed 4 ~ 8 apertures, the aperture of the cylindrical outer surface of stationary ring is communicated with respectively with the aperture of stationary ring its right end face corresponding position, in " L " type after aperture is communicated with, i.e. 4 ~ 8 " L " type through holes, on the diameter dimension of " L " type aperture and shell, through-hole diameter is measure-alike, the material that stationary ring and rotating ring select hardness suitable, make when axle does not rotate, stationary ring can be combined closely with rotating ring under spring force, seal action can be played to liquid medium when axle is static.On stationary ring, 4 ~ 8 " L " type vents can ensure rotating ring and stationary ring uniform force after being strutted by the gas of pressure pump, not run-off the straight.
Described axle is processed with spiral chute on the surface, spiral fluted dimensional parameters, namely, groove width, groove depth, spiral fluted lead angle and spiral fluted shaft part length are all chosen according to the design parameter of spiral seal, but the spiral chute on axle not plays the effect of spiral seal, but play the effect of the volute pump contrary with spiral seal.Therefore this spiral fluted screw thread precession direction is contrary with the sense of rotation under axle rotary state, make when axle rotates, this thread groove is produced pressurization to its right-hand member by seal fluid, make spiral chute right-hand member under axle rotary state by seal fluid due to spiral fluted pressurization the pressure P that produces
1be greater than spiral chute right-hand member under state of rest by seal fluid pressure P
0, that is, from axle right-hand member to left end, when axle is for being rotated counterclockwise, spiral fluted rotation direction should be processed into dextrorotation, and when axle is for turning clockwise, spiral fluted rotation direction should be processed into left-handed.
Under axle state of rest, spiral chute right-hand member is P by seal fluid pressure
0; Under axle rotary state, spiral chute right-hand member is P by seal fluid pressure
1; The gas pressure be filled with in " L " type aperture under axle rotation situation on stationary ring is P
2; Stationary ring and the rotating ring combination force closed under state is P
3; The pressure resistance that left pole shoe, permanent magnet, right pole shoe form second level sealing is P
4; Described pressure dependence meets P
4>P
2>=P
1>P
3>P
0.This pressure dependence makes, when axle is static, to be sealed by seal fluid by the stationary ring closed and rotating ring, when axle rotates, insufflation gas in " L " type aperture, and the second level sealing that this gas is formed by magnetic fluid sealing and by the liquid medium institute shutoff sealed, cannot outwardly with by seal fluid endoluminal leak, thus make the gas in aperture between stationary ring and rotating ring, form air film to seal by the liquid sealed, it also avoid to be produced by the contact of seal fluid and magnetic liquid and dissolve each other or mutually pollute, simultaneously, the inefficacy of the sealing after the wearing and tearing (wearing and tearing as in the past between mechanical sealing static ring and rotating ring) that the Contact of stationary ring and rotating ring can also be avoided to produce cause axle stationary ring and rotating ring when static to close.Thus no matter the second level making to be made up of magnetic fluid sealing sealing rotates or state of rest at axle, all completely with separated by seal fluid.The sealing of magnetic fluid sealing to liquid medium is achieved by this indirect mode.
Monolateral gap between stationary ring and axle or the monolateral gap be less than or equal between limited ring and axle.Thus between stationary ring and axle, produce sputtering after avoiding being pressurizeed by spiral fluted by seal fluid and act on.
In axle rotation process, stationary ring and rotating ring separate by the gas pressure in " L " type aperture on stationary ring, and this gap is greater than the gap in mechanical seal between rotating ring and stationary ring, simultaneously, because stationary ring and rotating ring are spaced, spring is compressed, make the pressure under stationary ring and rotating ring opening state be P
5, and P
5=P
2; In axle docking process, gradually the gas in " L " type aperture is extracted out by external pressure pump, thus the gas pressure be filled with in slow reduction " L " type aperture is P
2, until when axle is static, stationary ring and rotating ring recover to close state.
The internal diameter size of described limited ring is identical with the dimension of inner and outer diameters of stationary ring with outside dimension.
The outside dimension of described rotating ring is less than internal diameter of outer cover size, internal diameter size is identical with the greatest diametrical dimension of axle, rotating ring inner cylindrical surface is processed with the seal groove installing rubber seal, rotating ring its right end face is connected with spring, Placement preferred weld, spring is fixed on spring seat, means of fixation preferred weld, on spring seat, circumference is evenly processed with four set screw hole, connected by Cock screw and spring seat is fixedly connected with axle, in working procedure, rotating ring rotates with axle, rotating ring internal diameter and the fit system between axle are for excessively to coordinate, the material that rotating ring selects hardness suitable, make when axle does not rotate, stationary ring can be combined closely with rotating ring under spring force.
Described is non-magnet material every magnetic baffle ring and second gear ring material, and the material of described first baffle ring is that permeability magnetic material and non-magnet material can.
Described left bearing and right bearing are the deep groove ball bearing that specifications and models are identical, and described left snap ring is identical with right snap ring size shape and width is identical with the annular groove width on axle.
Described permanent magnet is circular, and outside dimension is identical with the outside dimension of left and right pole shoe, and material is rubidium iron boron.
Beneficial effect of the present invention:
(1) by controlling external pressure pump and pressure controlled valve, make axle when rotating, spiral chute on axle plays the effect of pressurization, pass into gas makes magnetic liquid and sealed medium isolate simultaneously, avoids magnetic liquid and sealed medium and produces and dissolve each other and pollute and can reach the seal request of zero leakage; (2) passing into gas in working procedure makes rotating ring and stationary ring be separated by air film, substantially reduce operation torque and can not produce working environment and pollute, make can not cause wearing and tearing between rotating ring and stationary ring simultaneously, when axle is static, by pressure pump and pressure controlled valve, the gas of " L " type aperture is extracted out, make rotating ring and stationary ring close the effect playing static seal, thus still can ensure zero leakage; (3) when on stationary ring, 4 ~ 8 " L " type apertures of evenly processing make dynamic and static ring be separated, rotating ring uniform force.
Accompanying drawing explanation
A kind of new multistage magnetic fluid seal device of Fig. 1 figure.
The pressure that on Fig. 2 axle, spiral chute produces is with the modified-image of running time.
In Fig. 1: shell 1, clutch shaft bearing 2, limited ring 3, stationary ring 4, pressure controlled valve 5, rotating ring 6, spring 7, spring seat 8, Cock screw 9, left pole shoe 10, permanent magnet 11, right pole shoe 12, first rubber seal 13, left snap ring 14, first baffle ring 15, second rubber seal 16, 3rd rubber seal 17, 4th rubber seal 18, second baffle ring 19, 5th rubber seal 20, axle 21, magnetic liquid 22, 6th rubber seal 23, every magnetic baffle ring 24, second bearing 25, right snap ring 26, end cap 27.
Embodiment
Be that the invention will be further described for embodiment with accompanying drawing:
A kind of new multistage magnetic fluid seal device, this device comprises: shell 1, clutch shaft bearing 2, limited ring 3, stationary ring 4, pressure controlled valve 5, rotating ring 6, spring 7, spring seat 8, Cock screw 9, left pole shoe 10, permanent magnet 11, right pole shoe 12, first rubber seal 13, left snap ring 14, first baffle ring 15, second rubber seal 16, 3rd rubber seal 17, 4th rubber seal 18, second baffle ring 19, 5th rubber seal 20, axle 21, magnetic liquid 22, 6th rubber seal 23, every magnetic baffle ring 24, second bearing 25, right snap ring 26, end cap 27.
Connection between each several part forming this device:
First clutch shaft bearing 2 is encased in the left end of shell 1 during assembling, make clutch shaft bearing 2 near the boss of shell 1 left end, then the first baffle ring 14 is loaded, the first baffle ring 14 is made to be close to the right side of clutch shaft bearing 2, second rubber seal 16 is encased in the seal groove of limited ring 3, limited ring 3 is encased in shell 1, be close to the right side of the first baffle ring 14, 3rd rubber seal is encased in the seal groove of stationary ring 4, stationary ring 4 is encased in shell 1, and make through hole on shell 1 just to the aperture on stationary ring 4 external cylindrical surface, gap between stationary ring 4 and axle 21 is less than or equal to the gap between limited ring 3 and axle 21.
Spring seat 8 four pieces of Cock screws are fixed on position suitable on axle 21, spring 7 right-hand member is fixedly connected with spring seat, 4th rubber seal 18 is contained in the seal groove of rotating ring 6, rotating ring 6 to be contained on axle 21 and rotating ring 6 is fixedly connected with spring 7 left end, form the first assembly, then the first assembly is encased in shell 1, to limiting stopper 3, the spiral seal groove that ensures processing on axle 21 just ensures that spring 7 has certain pretightening force to make rotating ring 6 be attached on stationary ring 4, now, the combination force P between stationary ring 4 and rotating ring 6
3should be greater than axle 21 static time Seal cage in the pressure P of sealed medium
0.
5th rubber seal 20 and the 6th rubber seal 23 are contained in the seal groove of left pole shoe 10 and right pole shoe 12 respectively, permanent magnet 11 mode of glueing joint is bonded between left pole shoe 10 and right pole shoe 12, inject magnetic liquid 22 at the internal diameter of permanent magnet 11 and form the second assembly, first the second baffle ring 19 is loaded in shell, make the second baffle ring 19 near the right side of stationary ring 4, again the second assembly is loaded in shell 1, make left pole shoe near the second baffle ring 19 not contact spring seat 8.
Magnetism resistent ring 24 and the second bearing 25 are loaded in shell 1 successively, magnetism resistent ring 24 makes right pole shoe 12 axially separate a segment distance with the second bearing 25, air between right like this pole shoe 12 and the second bearing 25 increases magnetic resistance between the two, can effectively prevent the magnetic line of force from entering the second bearing 25 too much and the seal clearance internal magnetic field intensity of the pole shoe caused and axle reduces, again left snap ring 14 and right snap ring 26 are loaded the left annular groove of axle 21 and right annular groove successively, first rubber seal 13 is contained in the seal groove on shell 1 left end flange plate, end cap 27 is loaded in shell 1, Placement is for being threaded, finally pressure controlled valve 5 is connected to the through hole on shell 1, form reliable seal arrangement.
In this new multistage magnetic fluid seal device, described stationary ring 4, rotating ring 6, spring 7, spring seat 8 and Cock screw 9 form first order sealing, and the magnetic fluid sealing that described left pole shoe 10, permanent magnet 11, right pole shoe 12 are formed is second level sealing.
Four through holes that on shell 1 left end flange plate, circumference is uniform, for this new multistage magnetic fluid seal device and by the connection of Seal cage, Seal cage is interior is liquid by the medium sealed, when axle 21 is static, combination force between stationary ring 4 and rotating ring 6 should be greater than in Seal cage by the pressure of seal fluid, the leakage of sealed medium in effective prevention Seal cage, working procedure axis 21 is in rotary state, spiral chute on axle 21 is to the effect being played volute pump by seal fluid medium, spiral chute right-hand member is made to be become large by the pressure of seal fluid, the external ambient pressure pump of through hole now on shell 1 is under the control of pressure controlled valve 5, by " L " type aperture on stationary ring 4 to insufflation gas in shell 1, the pressure of insufflation gas is P
2, be P by the pressure produced under the spiral chute effect of seal fluid medium on axle 21
1, the pressure resistance that left pole shoe 10, permanent magnet 11, right pole shoe 12 form second level sealing is P
4, now pressure meets P
4>P
2>=P
1>P
3>P
0.
The pressure controlled detailed process of this new multistage magnetic fluid seal device is: do not inflate in shell 1 when axle 21 is static, due to P
3>P
0, sealing medium cannot leak, and inflates, due to P when axle 21 starts to rotate in shell 1
2>=P
1, do not leak at gas pressure effect lower seal medium and make not contacted with magnetic liquid 22 by seal fluid medium, avoiding and dissolved each other or mutually pollute by seal fluid medium and magnetic liquid 22, due to P
2>P
3, rotating ring 6 and stationary ring 4 separate by gas, reduce the operation torque of axle.In real work, the rotating speed of axle is slowly increased to working speed, P
1strengthen gradually, in this process, pass into the gas pressure P in shell 1
2also synchronously increase, the gas be filled with by the cavity that is filled between rotating ring 6 and left pole shoe 10, due to P
4> P
2, the second pole sealing that left pole shoe 10, permanent magnet 11, right pole shoe 12 are formed serves reliable seal action to the gas in the cavity between rotating ring 6 and left pole shoe 10, and when needs stop, axle 21 rotating speed reduces gradually, P
1reduce gradually, now slowly extract the gas passed in shell 1 out, make gas pressure P
2synchronous reduction, meets P in whole process all the time
4>P
2>=P
1>P
3>P
0.
First order sealing is played seal action in Seal cage by the liquid medium sealed, and sealed medium is not contacted with magnetic liquid 22, second level sealing mainly plays seal action to the gas be filled with between rotating ring 6 and left pole shoe 10 in cavity, even if axle 21 is static, this new multistage magnetic fluid seal device also can play reliable seal action.
Claims (6)
1. a new multistage magnetic fluid seal device, it is characterized in that: this device comprises shell (1), clutch shaft bearing (2), limited ring (3), stationary ring (4), pressure controlled valve (5), rotating ring (6), spring (7), spring seat (8), Cock screw (9), left pole shoe (10), permanent magnet (11), right pole shoe (12), first rubber seal (13), left snap ring (14), first baffle ring (15), second rubber seal (16), 3rd rubber seal (17), 4th rubber seal (18), second baffle ring (19), 5th rubber seal (20), axle (21), magnetic liquid (22), 6th rubber seal (23), every magnetic baffle ring (24), second bearing (25), right snap ring (26), end cap (27), this device is used for seal fluid medium, left end is connected with by the Seal cage of seal fluid, described axle (21) is processed with spiral chute, clutch shaft bearing (2) is encased in the left end of shell (1), make clutch shaft bearing (2) near the boss of shell (1) left end, then the first baffle ring (15) is loaded, second rubber seal (16) is encased in the seal groove of limited ring (3), limited ring (3) is encased in shell (1), limited ring (3) left side is made to be close to the right side of the first baffle ring (15), 3rd rubber seal (17) is encased in the seal groove of stationary ring (4), stationary ring (4) is encased in shell (1), and make through hole on shell (1) just to the aperture on stationary ring (4) external cylindrical surface, and be close to the right side of limited ring (3), 4th rubber seal (18) is contained in the seal groove of rotating ring (6), rotating ring (6) is contained in axle (21) go up and the left end of rotating ring (6) right-hand member with spring (7) is fixedly connected with, spring seat (8) is fixed on the upper suitable position of axle (21) with four pieces of Cock screws (9), the right-hand member of spring (7) is fixedly connected with spring seat (8), form the first assembly, then the first assembly is encased in shell (1), the spiral chute ensureing the upper processing of axle (21) just to limiting stopper (3) and ensure spring (7) have certain pretightening force make the combination force P3 between stationary ring (4) and rotating ring (6) be greater than axle (21) static time by the pressure P 0 of seal fluid, pressure controlled valve (5) is connected to the through hole on shell (1), described stationary ring (4), rotating ring (6), spring (7), spring seat (8) and Cock screw (9) form first order sealing, then the 5th rubber seal (20) and the 6th rubber seal (23) are contained in the seal groove of left pole shoe (10) and right pole shoe (12) respectively, permanent magnet (11) mode of glueing joint is bonded between left pole shoe (10) and right pole shoe (12), inject magnetic liquid (22) at the internal diameter of permanent magnet (11) and form the second assembly, first the second baffle ring (19) is loaded in shell (1), make the second baffle ring (19) near the right side of stationary ring (4), again the second assembly is loaded in shell (1), make left pole shoe (10) near the second baffle ring (19) not contact spring seat (8), magnetism resistent ring (24) and the second bearing (25) are loaded in shell (1) successively, again left snap ring (14) and right snap ring (26) are loaded the left annular groove of axle (21) and right annular groove successively, first rubber seal (13) is contained in the seal groove on shell (1) left end flange plate, end cap (27) is loaded in shell (1), described left pole shoe (10), permanent magnet (11), right pole shoe (12) form second level sealing, the cylindrical outer surface of described shell (1) is processed with in 180 degree of equally distributed 4 ~ 8 through holes, through hole is connected with the lower interface of pressure controlled valve (5), and the upper interface of pressure controlled valve (5) is connected with external pressure pump, described pressure controlled valve (5) is made up of control valve and pressure transducer, and wherein pressure transducer is for measuring by the gas pressure in the pressure of seal fluid and " L " type aperture.
2. a kind of new multistage magnetic fluid seal device according to claim 1, is characterized in that:
The external cylindrical surface of described stationary ring (4) is processed with seal groove for installing rubber seal, cylindrical outer surface and its right end face are all processed with in 180 degree of equally distributed 4 ~ 8 apertures, aperture on the cylindrical outer surface of stationary ring (4) is communicated with respectively with the aperture of its right end face corresponding position, in " L " type after aperture is communicated with, i.e. 4 ~ 8 " L " type through holes, above through-hole diameter is measure-alike for the diameter dimension of " L " type aperture and shell (1), the material that stationary ring (4) selects hardness suitable, make when axle (21) does not rotate, stationary ring (4) can be combined closely with rotating ring (6) under spring force, seal action can be played to liquid medium when axle (21) is static.
3. a kind of new multistage magnetic fluid seal device according to claim 1, is characterized in that:
This spiral fluted screw thread precession direction is contrary with the sense of rotation under axle (21) rotary state, make when axle (21) rotates, this thread groove is produced pressurization to its right-hand member by seal fluid, make spiral chute right-hand member under axle (21) rotary state by seal fluid due to spiral fluted pressurization the pressure P that produces
1be greater than spiral chute right-hand member under state of rest by seal fluid pressure P
0, that is, from axle (21) right-hand member to left end, when axle (21) is for being rotated counterclockwise, spiral fluted rotation direction should be processed into dextrorotation, and when axle (21) is for turning clockwise, spiral fluted rotation direction should be processed into left-handed.
4. a kind of new multistage magnetic fluid seal device according to claim 1 or 2 or 3, is characterized in that:
Under axle (21) state of rest, spiral chute right-hand member is P by seal fluid pressure
0, under axle (21) rotary state, spiral chute right-hand member is P by seal fluid pressure
1; The gas pressure be filled with in " L " type aperture under axle (21) rotation situation on stationary ring (4) is P
2; The combination force that stationary ring (4) and rotating ring (6) close under state is P
3; The pressure resistance that left pole shoe (10), permanent magnet (11), right pole shoe (12) form second level sealing is P
4; Described pressure dependence meets P
4>P
2>=P
1>P
3>P
0.
5. a kind of new multistage magnetic fluid seal device according to claim 1, is characterized in that:
In axle (21) rotation process, stationary ring (4) and rotating ring (6) separate by the gas pressure in " L " type aperture on stationary ring (4), the gap separated is greater than the gap in mechanical seal between rotating ring and stationary ring, simultaneously, because stationary ring (4) and rotating ring (6) are spaced, spring (7) is compressed, makes the pressure under stationary ring (4) and rotating ring (6) opening state be P
5, and P
5=P
2; In axle (21) docking process, gradually the gas in " L " type aperture is extracted out by external pressure pump, thus slowly reduce the gas pressure P be filled with in " L " type aperture
2, until when axle (21) is static, stationary ring (4) and rotating ring (6) recover to close state.
6. a kind of new multistage magnetic fluid seal device according to claim 1, is characterized in that:
Monolateral gap between stationary ring (4) and axle (21) is less than or equal to the monolateral gap between limited ring (3) and axle (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782124A (en) * | 2016-03-16 | 2016-07-20 | 武汉工程大学 | Spiral groove heat dissipation and pressure reduction device for high-temperature centrifugal pump |
| CN105945662A (en) * | 2016-05-11 | 2016-09-21 | 重庆红江机械有限责任公司 | Internal spray booster type grinding wheel rod |
| CN106369169A (en) * | 2016-10-27 | 2017-02-01 | 北京交通大学 | Steam-proof magnetic liquid sealing device for reactor |
| CN107740866A (en) * | 2017-11-03 | 2018-02-27 | 广西科技大学 | A kind of staged device for sealing magnetic fluid |
| CN110274026A (en) * | 2019-06-28 | 2019-09-24 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of air curtain type face seals |
| CN110440006A (en) * | 2019-08-29 | 2019-11-12 | 浙江工业大学 | A kind of pressure adaptive mechanically-sealing apparatus |
| CN112204277A (en) * | 2018-05-30 | 2021-01-08 | 西门子股份公司 | Assembly, in particular turbomachine, comprising a shaft sealing device |
| CN112228540A (en) * | 2020-11-04 | 2021-01-15 | 福建中维动力科技股份有限公司 | Lubricating and sealing structure of speed regulation assembly of electric heavy truck |
| CN112728103A (en) * | 2020-12-30 | 2021-04-30 | 中铁工程装备集团有限公司 | Shield constructs owner and drives compound sealing device |
| CN112728112A (en) * | 2021-01-27 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device for vacuum dough mixer |
| CN113669449A (en) * | 2021-07-15 | 2021-11-19 | 金石机器人银川有限公司 | Sealing loose clamping mechanism for plugging and unplugging filter rod |
| CN114382893A (en) * | 2021-12-15 | 2022-04-22 | 清华大学 | Dynamic pressure type self-circulation magnetic liquid sealing device |
| CN110440006B (en) * | 2019-08-29 | 2024-05-03 | 浙江工业大学 | Pressure adaptation type mechanical sealing device |
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| RU203534U1 (en) * | 2020-10-19 | 2021-04-08 | Денис Юрьевич Палин | COMBINED MAGNETIC FLUID SHAFT SEAL |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782124A (en) * | 2016-03-16 | 2016-07-20 | 武汉工程大学 | Spiral groove heat dissipation and pressure reduction device for high-temperature centrifugal pump |
| CN105945662A (en) * | 2016-05-11 | 2016-09-21 | 重庆红江机械有限责任公司 | Internal spray booster type grinding wheel rod |
| CN106369169A (en) * | 2016-10-27 | 2017-02-01 | 北京交通大学 | Steam-proof magnetic liquid sealing device for reactor |
| CN107740866A (en) * | 2017-11-03 | 2018-02-27 | 广西科技大学 | A kind of staged device for sealing magnetic fluid |
| CN107740866B (en) * | 2017-11-03 | 2023-05-02 | 广西科技大学 | Stepped magnetic fluid sealing device |
| CN112204277A (en) * | 2018-05-30 | 2021-01-08 | 西门子股份公司 | Assembly, in particular turbomachine, comprising a shaft sealing device |
| US11674600B2 (en) | 2018-05-30 | 2023-06-13 | Siemens Energy Global Gmbh & Co., Kg | Assembly, more particularly turbomachine, comprising a shaft seal device |
| CN112204277B (en) * | 2018-05-30 | 2023-02-17 | 西门子能源环球有限责任两合公司 | Assembly, in particular turbomachine, comprising a shaft sealing device |
| CN110274026A (en) * | 2019-06-28 | 2019-09-24 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of air curtain type face seals |
| CN110440006A (en) * | 2019-08-29 | 2019-11-12 | 浙江工业大学 | A kind of pressure adaptive mechanically-sealing apparatus |
| CN110440006B (en) * | 2019-08-29 | 2024-05-03 | 浙江工业大学 | Pressure adaptation type mechanical sealing device |
| CN112228540B (en) * | 2020-11-04 | 2023-01-06 | 福建中维动力科技股份有限公司 | Lubricating and sealing structure of speed regulation assembly of electric heavy truck |
| CN112228540A (en) * | 2020-11-04 | 2021-01-15 | 福建中维动力科技股份有限公司 | Lubricating and sealing structure of speed regulation assembly of electric heavy truck |
| CN112728103A (en) * | 2020-12-30 | 2021-04-30 | 中铁工程装备集团有限公司 | Shield constructs owner and drives compound sealing device |
| CN112728103B (en) * | 2020-12-30 | 2022-04-22 | 中铁工程装备集团有限公司 | Shield constructs owner and drives compound sealing device |
| CN112728112A (en) * | 2021-01-27 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device for vacuum dough mixer |
| CN113669449A (en) * | 2021-07-15 | 2021-11-19 | 金石机器人银川有限公司 | Sealing loose clamping mechanism for plugging and unplugging filter rod |
| CN114382893B (en) * | 2021-12-15 | 2023-01-13 | 清华大学 | Dynamic pressure type self-circulation magnetic liquid sealing device |
| CN114382893A (en) * | 2021-12-15 | 2022-04-22 | 清华大学 | Dynamic pressure type self-circulation magnetic liquid sealing device |
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