CN204573108U - Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement - Google Patents
Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement Download PDFInfo
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- CN204573108U CN204573108U CN201420799578.3U CN201420799578U CN204573108U CN 204573108 U CN204573108 U CN 204573108U CN 201420799578 U CN201420799578 U CN 201420799578U CN 204573108 U CN204573108 U CN 204573108U
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Abstract
Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, agent structure arranges stuffing box at stern shaft seal place, and letter one end is gland, and the other end is connected with sternpost by flange plate; Parallel device two-layer PTFE annulus box cover in the middle of letter, every layer of box cover is embedded in nx12 block radial direction and liquidates magnetic sector permanent magnet; Magnetic fluid cyclic cavity is provided with between embedding magnetic box cover and central siphon; Respectively install 1 stainless steel annulus respectively in permanent magnet box cover both sides, radial direction respectively has 8 magnetic fluids and injects or tap hole; Outside two stainless steel annulus, each device 1 Stainless Steel Retainer Ring respectively, is held on stern tube by the polytetrafluoroethylsealed sealed circle of AH type metal frame; MCU is set, according to each pressure, temperature sensor information, control magnetic fluid front pump and electromagnetic relief valve, make in magnetic fluid cyclic cavity isobaric at random with shipping draft, realize stern tube sealing, lubrication, triple functions of lowering the temperature by cold and hot magnetic fluid circulation with pressure; Be provided with electromagnetic sealing lock when shutting down and strengthen stern tube static seal.
Description
One, technical field:
The present invention relates to big-and-middle-sized boats and ships that all kinds of propeller cavitation drives (comprise aircraft carrier and all kinds ofly big-and-middle-sizedly to dive, naval vessels) stern shaft seal principle, encapsulating method, the change of sealing configuration and innovation, eliminate the contact seal mode of various backwardness, realize the No leakage of stern tube shaft in seal area, seal without wearing and tearing, noiseless, non-thermal radiation and the good intelligence of weakening.
About magnetic fluid intelligence sealing technique, Deng's the present inventor hypo goes through the research of more than 10 years, once obtains ZL 200820065400.0 utility model patent; ZL 201420073652.3 utility model patent; ZL 201410057806.4 patent of invention is substantive examination bulletin, the patented product reaches 3 ~ 5MPa (being equivalent to carry the pressure of 300 ~ 500 meters under water) to the motive sealing of oil-field oil pumper polished rod reciprocating shaft, and reached more than 1 year without any leakage, apply in the oil field such as Kelamayi, Jilin at present, respond well.Facts have proved, core technology of the present invention---the reciprocal axle of numerous magnetic loop magnetic fluids and rotation axis moving seal technology, novel fat based magnetofluid composite filling technology are practicability and effectiveness technology, and the present invention is exactly deep development to former patented technology and expansion.
Two, background technique:
1, active service like product kind
The various ships stern shaft seal gland driven by propeller cavitation, through to update for a long time and perfect, the lubrication and seal that catchments, packing_seal, oil lubrication sealing, air-blowing sealing, mechanical end face seal and various composite seal are developed into now in interior family various in style.In more famous the having of world's shipbuilding industry: CX, DX compact type seal arrangement that Japanese kobe steel is developed; The combined face seal device of deep-sea sealing company of Britain exploitation; Xin Pokelaisi (SIMPLEX SC2000) seal arrangement of Blohm+Voss AG company of Germany exploitation; " gas side of a ship platform " (AIRGUARD 3AS) seal arrangement of marine technology Co., Ltd. of Japan exploitation; At home, what current civilian aspect generally adopted is CYH, CYQ type stern tube shaft lubricated sealing device of oil, mainly adopts the compound sealing device of oil lubrication sealing+air-blowing sealing+mechanical end face seal in military domain.But no matter be that seal arrangement, oil lubrication sealing is all the main body of sealing configuration, and national authorities promulgated related standards GB/T25017-2010 in 2010.
2, active service like product sealing principle
(1), active service stern shaft seal gland, no matter be international top-brand or home brands, all adopt the nitrile butadiene rubber of multiple tracks band spring skeleton, four viton seal rings or packing " to hold " axle bush pipe tightly to realize sealing, be usually referred to as contact seal;
(2), anti-silt and marine alga invade, and adopts to compress rubber ring and " hold " axle bush pipe tightly to realize sealing;
(3), recycle oil or circulating water is generally all adopted to realize sealing lubrication and the cooling at position.
3, the sealing configuration of active service standardized product
Fig. 3 is seal arrangement after the 20 meters of dark above screw shaft of ship of drinking water shown in GB/T25017-2010: rubber ring 24 is glanded 23 compressions, the lining 2 of " locking " stern tube shaft 1, stops seawater and silt to invade; " J " shape rubber ring 26,28,31 with spring skeleton is for preventing the three seals that seawater invades in cabin and bearing lubricating oil leaks, and 25,27,29 is rubber seal snap ring, and oil enters oily cyclic cavity 30 from 33 and lubricates for each road seal ring and lower the temperature.
GB/T25017-2010 specify the front seal arrangement of screw shaft of ship and above-mentioned rear seal arrangement similar, without the need to repeating.
4, have problems
(1), leaking is control chronic disease incessantly.No matter be international famous brand or domestic famous brand producer product, no matter be oil lubrication sealing, water lubrication sealing, air-blowing sealing, packing_seal, end face seal or various composite seal, all there is leakage problem without exception.The leakage rate standard of the dark above screw shaft of ship sealing of the drinking water that GB/T25017-2010 specifies 20 meters is:
In fact, general screw shaft of ship seal leakage amount all can exceed this standard, and especially in the middle and later periods that sealing device uses, leakage rate can exceed standard greatly.
(2), befouling environment.Because existing various seal arrangement has leakage more or less to produce, be that recycle oil and lubricant oil directly bleed sea on the one hand; Be that seawater leaks into cabin on the other hand, oil, water are separated and are not thoroughly discharged into sea, and two aspects all form offshore floating oil pollution.In today that requirement of protecting the marine environment is more and more stricter, this pollution is flagrant.
(3), there is potential safety hazard.Due to various rubber seal and packing working life general all below 8000 hours, that is operate at full capacity the life-span less than 1 year, use the middle and later periods at such seal arrangement, sealing may be lost efficacy at any time, cause stern tube shaft leak out of control and spray water, discharge is not as good as just flooding cabin even shipwreck.
(4), power loss is large.According to the research of the people such as Harbin Engineering University professor Yang Enxia, the contact type sealing device of rotating shaft held tightly by active service high-abrasive material, and generally will lose 10 ~ 40% of valuable main engine power, obviously this is also the significant wastage of the energy.
(5), vibration is large, noise is large.The contact type sealing device of rotating shaft held tightly by active service high-abrasive material, because " locking " (end face seal then will " hold out against " even " dieback ") rotating shaft " held " even tightly by needs, the incoordination of must aggravate bow axle, moving between jack shaft and stern tube shaft, thus can strengthen axial float and circular runout, noise also can increase thereupon.
(6), oil-water-gas circulation, reclaim, be separated, releasing system is complicated, maintenance difficult.For 6.5 ton bulk carriers, stern shaft seal gland comprises: stern pipe lubricating oil tank unit, gravity oil tank unit, oil conservater unit, air control unit, lubricating oil and seawater store up separation discharge module etc., pipeline, valve, oil pump, water pump, motor and electric control system are complicated, and regular job is not easy.
(7), sealing load can not be adjusted at random.Because contact type sealing device is all generally carry out compensation sealing lip (or the sealing faying surface) enclasping force to axle by spring skeleton or elastic compensating mechanism, and this mechanical elastic is exactly a definite value when equipment is installed, it just can not change with the drinking water depth, rotating speed size, temperature, this seal pattern with " allergic effect ten thousand does not become " is the common fault of active service stern shaft seal gland, is also that frictional resistance is large, power consumption large, the easy basic reason losing efficacy, easily leak.
Three, summary of the invention:
1, goal of the invention
In order to adapt to boats and ships modernization, maximization, speed up development, overcome many defects such as existing various contact-type stern shaft seal gland frictional resistance is large, power consumption is large, leakage rate is large, energy consumption is high, Safety and Environmental Protection is poor, installation and maintenance are complicated, with a kind of in stern shaft seal district No leakage, to seal without the intelligence that wearing and tearing, noiseless, non-thermal radiation, weakening are good and replace.
2, concrete scheme of the present invention
Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, it is characterized in that: at stern shaft seal, place arranges stuffing box, gland is established in letter one end, and the other end is connected with sternpost by flange plate; Parallel device two-layer PTFE annulus box cover in the middle of letter, every layer of box cover is embedded in n x 12 pieces of radial directions and liquidates magnetic sector permanent magnet; Magnetic fluid cyclic cavity is provided with between embedding magnetic box cover and stern tube; Respectively install 1 stainless steel annulus respectively in permanent magnet box cover both sides, radial direction respectively has 8 magnetic fluids and injects or tap hole; Outside two stainless steel annulus, each device 1 Stainless Steel Retainer Ring respectively, is held on stern tube by the polytetrafluoroethylsealed sealed circle of AH type metal frame; MCU is set, according to each pressure, temperature sensor information, control magnetic fluid front pump and electromagnetic relief valve, make in magnetic fluid cyclic cavity isobaric at random with shipping draft, realize stern tube sealing, lubrication, triple functions of lowering the temperature by cold and hot magnetic fluid circulation with pressure; Be provided with electromagnetic sealing lock when shutting down and strengthen stern tube static seal.
According to above-mentioned screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, its additional characteristic feature is: PTFE annulus box cover is embedded in n x 12 pieces of radial directions and liquidates magnetic sector permanent magnet, and stern tube diameter≤500mm gets n=1; Stern tube diameter gets n=2 between 500 ~ 800mm; Stern tube diameter > 800mm gets n=3; Another formation can be divided in magnetic fluid cyclic cavity to have the high magnetic fields district of 36,72,108 magnetic loops, magnetic fluid firmly adsorbed and controls to circulate in cyclic cavity, externally blocking seawater, internally block lubricating oil.
According to above-mentioned screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, its additional characteristic feature is: magnetic fluid cyclic cavity is surrounded by stuffing box outer wall, 2 Stainless Steel Retainer Rings, 2 polytetrafluoroethylsealed sealed circles of AH type metal frame and stern tubes; When stern tube High Rotation Speed, the magnetic fluid layer temperature near central siphon raises, and density diminishes, magnetic weakens and even disappears, the normal temperature magnetic fluid pumped into pressure by displacement it and extruded outside stuffing box, so move in circles, play simultaneously sealing, lubrication, cooling triple role; At magnetic fluid cyclic cavity, the inside and outside and place such as numerical control pressure pump, electromagnetic relief valve establishes multiple pressure, temperature transducer, is automatically controlled, make the inside and outside random equipressure of Seal cage by MCU.
3, theoretical principle of the present invention
According to modern quantum-mechanical theory, material is due to the microcosmic interaction effect generation magnetic field of electron spin magnetic moments, orbital magnetic moment and nuclear moments; Magnetic field is the objective form of one that material exists; Magnetic field has energy and momentum; Any magnetic bodies always has N pole and S pole, and the two poles of the earth can not independently exist, and its essence is the Orienting ordered arrangement of inner magnetic domain.Massachusetts Institute Technology R.C.Ohandley teaches to be proved through long-term experiment research, and (granularity is 10 for single magnetic domain or many magnetic domains soft magnetic property liquid
-7~ 10
-9m), magnetize under strong magnetic field action, polarity orientation ordered arrangement can be formed at three dimensional space, and its mathematical description defers to the fundamental equations such as Maxwell, Biot-Savart, Bernoulli.Accordingly, the Basic Theoretical Framework by magnetic fluid circulation seal stern tube with pressure is established.
4, the technology of the present invention innovative point
(1), numerous magnetic loop Magneticfluid Seal Technique
Be indicated in mechanical design handbook by the running shaft device for sealing magnetic fluid structure generally admitted as shown in Figure 3, magnet ring 38 is set, pole shoe 37,39 is established at ring two ends again, rely on the magnetic loop 35 that pole shoe and steel axle transmit, at pole shoe 37, between 39 and axle, form 34,36 twice " O " shape magnetic fluid sealing rings, running shaft 1 is sealed.Ben: the magnetic loop 35 that A, this structural type produce, 1 magnetic loop can only be formed, be usually referred to as single magnetic loop; B, this structural type also rely on the transmission of steel axle to magnetic loop, if having stainless steel shaft sleeve pipe or copper bush pipe parcel axle, then this sealing means is unavailable.
Different from single magnetic loop, the present invention adopts numerous magnetic loop sealing technique.As shown in Figure 4, in stuffing box 17, load PTFE box cover 10, embed radial direction in box cover and to liquidate magnetic sector permanent magnet 9 totally 12 pieces, heteropole is made it adjacent during setting-in, between adjacent two pieces of permanent magnets, form 1 magnetic loop, 12 magnetic loops can be formed at 1 sagittal plane of axle, as shown in Figure 5; The present invention arranges 2 layers of embedding permanent magnet PTFE box cover in letter, while forming 24 magnetic loops altogether diametrically, forms 12 magnetic loops again in the axial direction, as shown in Figure 6; The high magnetic fields district formed by 36 magnetic loops of radial and axial intertexture, absorption and control magnetic fluid forms firmly " O " shape magnetic fluid sealing ring 13, seals up central siphon 2.Because numerous magnetic loop is formed between embedding permanent magnet, it does not rely on stern tube magnetic conduction and independently exists, therefore, when central siphon High Rotation Speed, AH RunddichtringO 6,15 lip opens, and the strong magnetic field that numerous magnetic loop is formed also can be lived magnetic fluid and do not leak by absorption and control.
(2), the magnetic fluid that circulates with pressure is to rotation axis seal, lubrication, falling temperature technique
The sealing of active service boats and ships stern shaft seal gland is by various forms of rubber ring; Lubrication is by recycle oil; Cooling is by recycle oil or circulating water.
The present invention adopts magnetic fluid circulating technology with pressure, realizes sealing, lubrication, cooling three kinds of functions simultaneously.As shown in Figure 7, the magnetic fluid W with pressure of injection, by permanent magnet 9 and 9 " absorption and control, be filled in the closed cyclic cavity of 2 AH RunddichtringOs, realize the sealing to central siphon 2; When central siphon High Rotation Speed, magnetic fluid there will be A, B, C temperature, density, magnetic gradient variation zone; In the A district near central siphon, magnetic fluid temperature raises, and density declines, and magnetic weakens and even disappears, and takes second place in B district; First the normal temperature magnetic fluid with pressure of new injection enters C district, then enters B district, presses to A district, automatically replaced hydrothermomagnetic and extruded sealed letter, and realizing circulating cooling; The present invention adopts homemade novel fat based magnetofluid composite filling, can form multilayer magnetic fluid, oil film compound " fluid cushion ", play good lubrication effect on high-speed rotating shaft cover.
What is distinguished to adopt magnetic fluid with pressure circulation and employing to be with force feed to circulate? under the powerful centrifugal action of running shaft, recycle oil is often thrown out of seal area polluted water region with " splashing " form, and band setting-out also can be availed oneself of the opportunity to get in cabin, produces inevitable two-way leakage; Adopt magnetic fluid with pressure to circulate then different, fat based magnetofluid under separate cover exists " centripetal force " to permanent magnet all the time, although be subject to the powerful centrifugal action of running shaft, but under the effect of strong magnetic field power, can be adsorbed, controlled in sealed letter, and can not " be splashed ", more can not be thrown away.
(3), stuffing box is inside and outside controls random isobaric inclusion seal technology automatically by MCU
In field of sealing technology, generally admit a rule, reducing or eliminating exactly in sealed letter and by the pressure reduction between sealer, is the fundamental way reducing or eliminating leakage.
According to this thinking, devise intelligent control system as shown in Figure 8.In figure, 43 is closed magnetic fluid storage cabinet, and 44 are respectively into and out of one-way valve; MCU40 collects multiple piezoresistance type high sensitivity pressure transducer 4 and temperature sensitive semiconductor temperature sensor 3 information, control motor 41, two screw pump 42 and type pilot ratio electromagnetic type overflow reduction valve 45, make pressure in sealed letter magnetic fluid race way isobaric at random with shipping draft; Meanwhile, system data is presented on liquid crystal screen 47 by MCU, can be operated by remote controller 48; If any exception, then report to the police by 46.
5, the present invention expects effect
(1), good sealing effect, long service life.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, realize circulation magnet fluid sealing with pressure, lubrication, cooling integrated technique, particularly adopt MCU intelligent control technology, make in sealed letter isobaric at random with draft, really can realize " 0 " to leak, this is that any active service seal arrangement is beyond one's reach; As long as add some magnetic fluids to magnetic fluid storage cabinet in good time, this seal arrangement life-span can be made to reach more than 10 years.
(2), environmental pollution is avoided.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, block seawater and enter cabin and lubricating oil access to the sea, the leakage phenomenon of existing various seal arrangement can be overcome, avoid offshore floating oil pollution, protect the marine environment.
(3) effective rate of utilization of main engine power 10 ~ 40%, is improved.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, in high magnetic fields, use novel fat based magnetofluid composite filling to seal, no longer rely on rubber ring " locking " sealing, multilayer magnetic fluid, oil film compound " fluid cushion " can be formed on high-speed rotating shaft cover, good lubrication effect is played to axle sleeve, this be close to " 0 " frictional resistance, " 0 " wearing and tearing, " 0 " power consumption sealing, the main engine power 10 ~ 40% that contact type sealing device loses can be given for change, significantly energy-saving and cost-reducing, be conducive to improving the speed of a ship or plane.
(4), safe and reliable.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, because cost is not high, 2 cover circulation and control system can be established, when set of system lost efficacy, the work of automatically starting second cover system; When shutting down, starting electromagnetic sealing lock and assisting to strengthen stern shaft seal; So just can avoid due to rubber seal and packing short for working life, in use the later stage may lose efficacy at any time, cause stern tube shaft leak out of control and water spray potential safety hazard.
(5), noise is little, and weakening is good.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, no longer rely on rubber ring " locking " sealing, multilayer magnetic fluid, oil film compound " fluid cushion " can be formed on high-speed rotating shaft cover, make axle sleeve in " fluid cushion " upper rotation, be close to " 0 " frictional resistance, " 0 " wearing and tearing, " 0 " power consumption, bow axle, jack shaft and stern tube shaft can be made to move and more coordinate, greatly reduce axial float and circular runout, therefore noise is little, and weakening is good.
(6), MCU intelligent control, sealing load adjusts at random automatically.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, because the application at field of industrial automatic control MCU is very ripe, the application of the equipment such as in addition advanced piezoresistive pressure transducer, temperature sensitive transistor temperature sensor, type pilot ratio electromagnetic type overflow reduction valve and numerical control hydraulic pump, realize automatically adjusting with shipping draft in sealed letter, isobaric at random, there is no technical bottleneck, screw shaft of ship sealing technique can be made to jump and attain a new height.
(7), simple to operate, easy to maintenance.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, relative to the various seal arrangement of active service, water circulation be reduced, air controls, seawater stores up the unit such as separate discharge, structure relative simplicity, available digital display screen or remote controller operation; Maintenance then adopts modularization substitute mode, very easy.
(8), overall economics remarkable benefit.Adopt stern tube shaft numerical control magnetic fluid intelligence seal arrangement, not only sealing screw shaft of ship is an innovation, and technique also can be applicable to all kinds of military big-and-middle-sized latent naval vessels (comprising aircraft carrier), and the technology degree of association is high, industry broad covered area; Just improve 10 ~ 40% main engine powers, the economic benefit that energy-conservation, speed-raising brings, environmental benefit are very remarkable.
6, important technological parameters
Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, important technological parameters is as follows:
1, permanent magnet BH:40 ~ 43MGOe;
2, permanent magnet Hcb: >=12.4kOe;
3, magnetic fluid viscosity: 500 ~ 600mPa.s (30 DEG C)
4, stuffing box axial tensile strength: >=600MPa
5, PTFE box overlaps radial tensile strength :≤30MPa
6, serviceability temperature :-40 ~+150 DEG C
7, sealing load :≤10MPa (max)
8, noise reducing: >=10dB
9, main engine power is improved: >=10%
10, service life: 10Yr
Four, accompanying drawing illustrates:
Fig. 1 is screw shaft of ship numerical control magnetic fluid intelligence seal body structural representation
Fig. 2 is that GB/T25017-2010 absorbs water 20 meters of dark above screw shaft of ship seal body structural representations
Fig. 3 is single magnetic loop running shaft magnetic fluid sealing structure schematic diagram
Tu4Shi mosaic magnet PTFE box overlaps radial cut-away view
Numerous magnetic loop schematic diagram that Tu5Shi mosaic magnet is formed radially at stern tube shaft
Numerous magnetic loop schematic diagram that Tu6Shi mosaic magnet is axially formed at stern tube shaft
Fig. 7 is that in sealed letter, magnetic fluid realizes sealing, lubricates, lowers the temperature that three functions are with pressure circulates schematic diagram
Fig. 8 is screw shaft of ship numerical control magnetic fluid intelligence seal arrangement MCU control unit route map
In above-mentioned Fig. 1 ~ 8 respectively number: 1, stern tube shaft sequentially; 2, stern tube shaft lining; 3, temperature sensitive semiconductor temperature sensor; 4, piezoresistive pressure transducer; 5,16, stainless steel AH type PTFE seal ring snap ring, 6,15, the polytetrafluoroethylsealed sealed circle of AH type metal frame; 7,13, magnetic fluid cyclic cavity; 8,14, radial four through hole stainless steel rings; 9,12, rare-earth Nd-Fe-B permanent magnet; 10,11, PTFE permanent magnet box cover; 17, packing box flange dish; 18, boats and ships stern post; 19, standby electricity magnetic seal lock is shut down; 20, stuffing box gland seal ring; 21,22, circulation magnetic fluid is into and out of letter interface; 23, oil-sealing arrangement gland; 24, elastomeric seal circle; 25,27,29, spring backbone sealing ring snap ring; 26,28,31, spring backbone sealing ring; 30, oily circulation chamber; 32, mounting flange 33, recycle oil entrance; 34,36, " O " shape magnetic fluid sealing ring; 35, the magnetic line of force; 37,39, pole shoe; 38, permanent magnet; 40, MCU controller; 41, motor; 42, numerical-control screw rod pump; 43, magnetic fluid closes storage cabinet; 44, one-way valve; 45, type pilot ratio electromagnetic type overflow reduction valve; 46, alarm; 47, LED display; 48, remote controller.
Five, embodiment:
See Figure of description 1 ~ 8, screw shaft of ship numerical control magnetic fluid intelligence seal arrangement of the present invention, after stern tube shaft, seal position arrange stuffing box, letter one end is gland 20, and the other end is connected with sternpost 18 by flange plate 17; Parallel device two-layer PTFE annulus box cover 10,11 in the middle of in letter, every layer of box cover is embedded in n x 12 pieces of radial directions and liquidates magnetic sector permanent magnet 9,9 " etc.; Magnetic fluid cyclic cavity 7,13 is provided with between embedding magnetic box cover and axle bush pipe; Respectively install 1 stainless steel annulus 8,12 respectively in permanent magnet box cover both sides, radial direction respectively has 8 magnetic fluids and injects or tap hole; Outside two stainless steel annulus, each device 1 Stainless Steel Retainer Ring 5,14 respectively, is held on stern tube shaft 1 and central siphon 2 by the polytetrafluoroethylsealed sealed circle of AH type metal frame; MCU is set, according to each pressure transducer 4, temperature transducer 3 information, controls magnetic fluid front pump 41,42 and electromagnetism overflow reduction valve 45, to make in magnetic fluid cyclic cavity 7,13 and shipping draft isobaric at random; Control route and be also provided with alarm, LED display, intelligent seal arrangement remotely-controlled operation can be realized; Be provided with electromagnetic sealing lock when shutting down and strengthen stern tube static seal; This stern tube shaft numerical control magnetic fluid intelligence seal arrangement, adpting flange suitably adjusts, and seals before being applicable to stern tube shaft.
Claims (3)
1. screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, it is characterized in that: at stern shaft seal, place arranges stuffing box, gland is established in letter one end, and the other end is connected with sternpost by flange plate; Parallel device two-layer PTFE annulus box cover in the middle of letter, every layer of box cover is embedded in nx12 block radial direction and liquidates magnetic sector permanent magnet; Magnetic fluid cyclic cavity is provided with between embedding magnetic box cover and stern tube; Respectively install 1 stainless steel annulus respectively in permanent magnet box cover both sides, radial direction respectively has 8 magnetic fluids and injects or tap hole; Outside two stainless steel annulus, each device 1 Stainless Steel Retainer Ring respectively, is held on stern tube by the polytetrafluoroethylsealed sealed circle of AH type metal frame; MCU is set, according to each pressure, temperature sensor information, control magnetic fluid front pump and electromagnetic relief valve, make in magnetic fluid cyclic cavity isobaric at random with shipping draft, realize stern tube sealing, lubrication, triple functions of lowering the temperature by cold and hot magnetic fluid circulation with pressure; Be provided with electromagnetic sealing lock when shutting down and strengthen stern tube static seal.
2. screw shaft of ship numerical control magnetic fluid intelligence seal arrangement according to claim 1, is characterized in that: PTFE annulus box cover is embedded in nx12 block radial direction and liquidates magnetic sector permanent magnet, and stern tube diameter≤500mm gets n=1; Stern tube diameter gets n=2 between 500 ~ 800mm; Stern tube diameter > 800mm gets n=3; The high magnetic fields district of 36,72,108 magnetic loops can be formed in magnetic fluid cyclic cavity respectively, magnetic fluid firmly adsorbed and controls to circulate in cyclic cavity, externally blocking seawater, internally block lubricating oil.
3. according to claim 1 screw shaft of ship numerical control magnetic fluid intelligence seal arrangement, it is characterized in that: magnetic fluid cyclic cavity is surrounded by stuffing box outer wall, 2 Stainless Steel Retainer Rings, 2 polytetrafluoroethylsealed sealed circles of AH type metal frame and stern tubes; When stern tube High Rotation Speed, magnetic fluid layer temperature near central siphon raises, density diminishes, magnetic weakens and even disappears, the normal temperature magnetic fluid with pressure of new injection was automatically replaced hydrothermomagnetic and was extruded outside sealed letter, so move in circles, play sealing, lubrication, cooling triple role simultaneously; At magnetic fluid cyclic cavity, inside and outside and numerical control pressure pump, electromagnetic relief valve place establish multiple pressure, temperature transducer, automatically controlled, make the inside and outside random equipressure of Seal cage by MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420799578.3U CN204573108U (en) | 2014-12-15 | 2014-12-15 | Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement |
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| CN201420799578.3U CN204573108U (en) | 2014-12-15 | 2014-12-15 | Screw shaft of ship numerical control magnetic fluid intelligence seal arrangement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534099A (en) * | 2014-12-15 | 2015-04-22 | 邓海波 | Intelligent sealing device for ship tail shaft numerical control magnetic fluid |
| CN106640202A (en) * | 2016-12-24 | 2017-05-10 | 上海齐耀膨胀机有限公司 | Shaft sealing device of high temperature steam screw machine, and pressure control method of shaft sealing device |
| CN108069343A (en) * | 2018-01-23 | 2018-05-25 | 中国水利水电夹江水工机械有限公司 | A kind of underwater sediment prevention device and method of micro-pressure-difference |
| CN108825576A (en) * | 2018-07-02 | 2018-11-16 | 长沙理工大学 | A kind of operation method of control pressurer system |
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2014
- 2014-12-15 CN CN201420799578.3U patent/CN204573108U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534099A (en) * | 2014-12-15 | 2015-04-22 | 邓海波 | Intelligent sealing device for ship tail shaft numerical control magnetic fluid |
| CN106640202A (en) * | 2016-12-24 | 2017-05-10 | 上海齐耀膨胀机有限公司 | Shaft sealing device of high temperature steam screw machine, and pressure control method of shaft sealing device |
| CN106640202B (en) * | 2016-12-24 | 2022-08-23 | 上海齐耀膨胀机有限公司 | Shaft seal device of high-temperature steam screw machine and pressure control method thereof |
| CN108069343A (en) * | 2018-01-23 | 2018-05-25 | 中国水利水电夹江水工机械有限公司 | A kind of underwater sediment prevention device and method of micro-pressure-difference |
| CN108069343B (en) * | 2018-01-23 | 2024-03-01 | 中国水利水电夹江水工机械有限公司 | Micro-pressure difference underwater silt prevention device and method |
| CN108825576A (en) * | 2018-07-02 | 2018-11-16 | 长沙理工大学 | A kind of operation method of control pressurer system |
| CN108825576B (en) * | 2018-07-02 | 2019-09-06 | 长沙理工大学 | A kind of operation method of control pressurer system |
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