CN104165230B - Ventilation type air cooling magnetic liquid sealing device - Google Patents
Ventilation type air cooling magnetic liquid sealing device Download PDFInfo
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- CN104165230B CN104165230B CN201410380193.8A CN201410380193A CN104165230B CN 104165230 B CN104165230 B CN 104165230B CN 201410380193 A CN201410380193 A CN 201410380193A CN 104165230 B CN104165230 B CN 104165230B
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- pole shoe
- permanent magnet
- rubber seal
- shell
- magnetic liquid
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Abstract
The invention discloses a ventilation type air cooling magnetic liquid sealing device and belongs to the field of mechanical engineering sealing. The ventilation type air cooling magnetic liquid sealing device successfully solves the problems that when the online speed of an existing magnetic liquid sealing device is larger than 20 m/s, the heating amount of magnetic liquid in a sealing gap is larger, the service life is shortened, and the magnetic liquid even fails. The ventilation type air cooling magnetic liquid sealing device comprises a shell (2), a first pole shoe (3), a first permanent magnetic body (4), a second pole shoe (5), a second permanent magnetic body (6), a third pole shoe (7), a shaft sleeve (10), a ventilation connector (12) and other parts. According to the ventilation type air cooling magnetic liquid sealing device, a cooling circulating channel for cooling air to circulate is formed among the ventilation connector (12), the shell (2), a ventilation hole in the second permanent magnetic body (6), a sealing cavity II and a shaft sleeve (10). The channel can ensure cooling of magnetic liquid under all pole teeth, conduction paths are reduced, and the cooling circulating efficiency is improved.
Description
Technical field
The invention belongs to sealing field of mechanical engineering.
Background technique
Magnetic fluid sealing is applied in the sealed environment of major diameter, high linear speed, and the magnetic liquid in seal clearance often lost efficacy because temperature is too high, and in the world, the cooling of major diameter, high linear speed operating mode magnetic hydraulic seal is also a difficult problem always.Therefore most important with research and development to the improvement of the cooling-cycle device of magnetic fluid sealing, directly affect the working life of magnetic fluid seal device.
The type of cooling has the type of cooling of process water cold trap in pole shoe, as described in documents 1 (publication number is the patent of CN 103574041A) the most widely now; There is the type of cooling of installing water jacket at pole shoe excircle, as described in documents 2 (publication number is the patent of CN 200943707Y); There is the mode of to install the good metal of heat-conducting property in pole shoe both sides and carrying out cooling, device as described in documents 3 " magnetic liquid theoretical and application " 524 pages; Utilize the self cooling mode of the blade rotation on shell in addition, as described in documents 4 (patent No. is the patent of US 7338049B2); Device described in documents 5 (publication number is the patent of CN 103557335A) can be filled with cooled gas in chamber, cools.But all there is cooling effect difference, problem that heat dissipation potential is low in the cooling unit described in above document.
Seal arrangement as described in documents 1 (publication number is the patent of CN 103574041A), the processing of its cooling bath is in pole shoe, this device has three place's shortcomings: first, in order to not affect magnetic circuit distribution thus reduce magnetic liquid voltage endurance capability, cooling bath usually distance seal clearance is comparatively far away, and heat conduction path is comparatively large, and radiating efficiency is low, when linear velocity is higher than 20m/s, its cooling effect will significantly reduce; The second, if in order to improve radiating efficiency, and reduce the distance of cooling bath and seal clearance, sealing voltage endurance capability will significantly reduce, and not possess practicability; 3rd, cooling bath leaves in pole shoe, and the material of pole shoe is generally magnetic conductive metal, is generally stainless steel material, and the thermal conductivity ratio gold, silver of steel, copper and aluminium are much lower, and therefore heat-conducting effect is limited.
Seal arrangement described in documents 2 (publication number is the patent of CN 200943707Y), its cooling principle is identical with documents 1, but its cooling effect is even not as good as the seal arrangement described in documents 1.
The good slug of heat-conducting property installed by seal arrangement described in documents 3 in pole shoe both sides, its heat-conductive characteristic significantly improves, but not there is circulating cooling system, in the long playing situation of seal arrangement, its cooling effect is not good, when linear velocity is higher than 20m/s, stream time is more than after 5h, and its cooling effect will significantly decline; Secondly, this Heat Conduction Material is arranged on pole shoe side, cannot cool the magnetic liquid in the seal clearance at magnet place, when linear velocity is higher, magnetic liquid herein is comparatively early lost efficacy, causes sealing voltage endurance capability to reduce and even lost efficacy.
Seal arrangement described in documents 4 (patent No. is the patent of US 7338049B2), it utilizes Sealing self rotation to increase and cools with the heat transfer of ambient gas, because ambient air temperature is uncontrollable, heat conduction path is very long, therefore cooling effect is very limited, the working environment that linear velocity is lower, the diameter of axle is less can only be applicable to, not there is practicability.
Seal arrangement described in documents 5 (publication number is the patent of CN 103557335A), this device is filled with corresponding gas in chamber or the object that vacuumizes is not for cooling, but prevents from mutually infiltrating between flammable explosive gas producing blast.If but change the gas in chamber into cooled gas, then can play certain cooling effect, but its shortcoming is cooled gas can not form effective circulating cooling at seal clearance place, therefore can only the magnetic liquid under outermost side pole tooth be cooled, magnetic liquid under internal side pole tooth can not carry out effective cooling, therefore, when on-line velocity is higher than 20m/s, the magnetic fluid sealing at interior side pole tooth place will lose efficacy, and voltage endurance capability is significantly declined.
Summary of the invention
The technical issues that need to address of the present invention are, when existing magnetic liquid rotating sealing device works under the environment of major diameter, high linear speed, because magnetic liquid heating value in seal clearance is large, easily cause sealing shortening in working life even to be lost efficacy.Therefore a kind of ventilated type air cooling magnetic fluid seal device is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Ventilated type air cooling magnetic fluid seal device, forms this device and comprises:
Magnetism resistent ring, shell, the first pole shoe, the first permanent magnet, the second pole shoe, the second permanent magnet, the 3rd pole shoe, screw, end cap, axle sleeve, the 3rd rubber seal, ventilating joint, the second rubber seal, the first rubber seal, magnetic liquid;
Connection between each several part forming this device:
The first described rubber seal is arranged in the groove on the first pole shoe cylindrical, form the first pole shoe of band rubber seal, second rubber seal is arranged in the groove on the second pole shoe cylindrical, form the second pole shoe of band rubber seal, 3rd rubber seal is arranged in the groove on the 3rd pole shoe cylindrical, forms the 3rd pole shoe of band rubber seal;
Described magnetism resistent ring is arranged on the right side of rotating shaft boss, axle sleeve is arranged on the right side of magnetism resistent ring; 3rd pole shoe order of the second pole shoe of the first pole shoe of band rubber seal, the first permanent magnet, band rubber seal, the second permanent magnet, band rubber seal is loaded in shell endoporus; With being threaded on shell end face end cap and shell fixed by screw, make each part axial location of enclosure; Band the first pole shoe of rubber seal, the first permanent magnet, the second pole shoe of band rubber seal, the second permanent magnet, the 3rd pole shoe of band rubber seal, end cap are inserted in rotating shaft together with shell, by housing flange dish is threaded shell axially locating; In an assembling process, after permanent magnet is installed, in the endoporus of permanent magnet, magnetic liquid is injected;
It is characterized in that:
First pole shoe, the first permanent magnet and the second pole shoe form sealed chamber I, and for sealing sealing medium, the second pole shoe, the second permanent magnet and the 3rd pole shoe form sealed chamber II, for sealing cooled gas; The magnetic fluid seal device of chamber at different levels different from the past all for sealing sealed medium.
Shell and the second permanent magnet are respectively processed with 1 vent, and in assembly process, two vent positions are identical, form path;
By the vent on ventilating joint, shell and the second permanent magnet, between sealed chamber II and axle sleeve, form the cool cycles passage being used for cooled gas circulation;
Axle sleeve is formed by the sleeve weld that three layers of internal diameter is different, forms hollow structure, being processed with a through hole for entering cooling air, being processed with a through hole for going out cooling air at end in the position being positioned at sealed chamber II.In order to ensure that cooled gas is circumferentially evenly distributed, the position of inlet hole and air outlet hole is 180 ° and distributes, the through-hole diameter entering cooling air is greater than the through-hole diameter of cooling air, allows inflation pressure higher than suction pressure simultaneously, and the magnetic liquid in the 3rd pole shoe seal clearance is cooled.
Axle sleeve also can by the magnetic conductivity sleeve weld of three layers of different inner diameters on two pieces of identical annular plate surfaces, three layers of length sleeve are identical, the position being positioned at sealed chamber II at outer barrel is processed with a through hole for entering cooling air, near the left end of mesosphere sleeve, process a through hole simultaneously, a processing through hole near the middle part of the 3rd pole shoe or right-hand member is corresponded at intermediate sleeve, two via area in mesosphere equal the area that outer barrel enters cooling air through hole, last annular plate surface between inner barrel and intermediate sleeve is processed with a through hole for going out cooling air.Internal, outer barrel carries out polishing processing after being welded, guarantees to meet dimension precision requirement, can ensure that the magnetic liquid in the 3rd pole shoe seal clearance is fully cooled like this.
The present invention compares had beneficial effect with prior art:
By the vent on ventilating joint, shell and the second permanent magnet, between sealed chamber II and axle sleeve, form the cool cycles passage being used for cooled gas circulation, this passage can guarantee the cooling of each pole tooth magnetic liquid, and decrease conducting path, improve cooling cycle efficiency, when successfully solving existing more than magnetic fluid seal device on-line velocity 20m/s, in seal clearance, magnetic liquid heating value is large, and working life shortens the problem even lost efficacy.
Accompanying drawing explanation
Fig. 1 ventilated type air cooling magnetic fluid seal device structural drawing;
The radial partial sectional view of Fig. 2 axle sleeve;
Fig. 3 axle sleeve mesosphere sleeve and medial and lateral length sleeve same structure figure.
In Fig. 1: magnetism resistent ring (1), shell (2), the first pole shoe (3), the first permanent magnet (4), the second pole shoe (5), the second permanent magnet (6), the 3rd pole shoe (7), screw (8), end cap (9), axle sleeve (10), the 3rd rubber seal (11), ventilating joint (12), the second rubber seal (13), the first rubber seal (14), magnetic liquid (15).
Embodiment
Be that the invention will be further described for embodiment with accompanying drawing:
Ventilated type air cooling magnetic fluid seal device, as Fig. 1, sealing device comprises: magnetism resistent ring 1, shell 2, first pole shoe 3, first permanent magnet 4, second pole shoe 5, second permanent magnet 6, the 3rd pole shoe 7, screw 8, end cap 9, axle sleeve 10, the 3rd rubber seal 11, ventilating joint 12, second rubber seal 13, first rubber seal 14, magnetic liquid 15.
Connection between each several part forming this device:
The first described rubber seal 14 is arranged in the groove on the first pole shoe 3 cylindrical, form the first pole shoe of band rubber seal, second rubber seal 13 is arranged in the groove on the second pole shoe 5 cylindrical, form the second pole shoe of band rubber seal, 3rd rubber seal 11 is arranged in the groove on the 3rd pole shoe 7 cylindrical, forms the 3rd pole shoe of band rubber seal;
Described magnetism resistent ring 1 is arranged on the right side of rotating shaft boss, axle sleeve 10 is arranged on the right side of magnetism resistent ring 1; 3rd pole shoe order of the second pole shoe of the first pole shoe of band rubber seal, the first permanent magnet 4, band rubber seal, the second permanent magnet 6, band rubber seal is loaded in shell 2 endoporus; With being threaded on shell 2 end face end cap 9 and shell 2 fixed by screw 8, make the inner each part axial location of shell 2; Band the first pole shoe of rubber seal, the first permanent magnet 4, the second pole shoe of band rubber seal, the second permanent magnet 6, the 3rd pole shoe of band rubber seal, end cap 9 are inserted in rotating shaft together with shell 2, by shell 2 flange plate is threaded shell 2 axially locating; In an assembling process, after permanent magnet is installed, in the endoporus of permanent magnet, magnetic liquid is injected.
For preventing cooled gas from housing to outward leakage, ventilating joint 12 and shell joint can adopt static seal device, as rubber seal rings for seal.
The cooled gas of this device can adopt the gases such as air, helium, nitrogen and carbon dioxide, by circulating to cooled gas at outside installation pump kind equipment, if adopt the higher helium of price to cool, the peristaltic pump of favorable sealing property can be adopted, and at outside Pipe installing cooling equipment, gas is cooled.
Axle sleeve 10 passes through the magnetic conductivity sleeve weld of three layers of different inner diameters on the annular plate surface of two pieces of same materials, and wherein, mesosphere sleeve is slightly shorter than medial and lateral sleeve.The position being positioned at sealed chamber II at outer barrel is processed with a through hole for entering cooling air, and the annular plate surface between inner barrel and intermediate sleeve is processed with a through hole for going out cooling air.Internal, outer barrel carries out polishing processing after being welded, guarantees to meet dimension precision requirement.
Axle sleeve 10 also can by the magnetic conductivity sleeve weld of three layers of different inner diameters on two pieces of identical annular plate surfaces, three layers of length sleeve are identical, the position being positioned at sealed chamber II at outer barrel is processed with a through hole for entering cooling air, near the left end of mesosphere sleeve, process a through hole simultaneously, a processing through hole near the middle part of the 3rd pole shoe 7 or right-hand member is corresponded at intermediate sleeve, two via area in mesosphere equal the area that outer barrel enters cooling air through hole, last annular plate surface between inner barrel and intermediate sleeve is processed with a through hole for going out cooling air.Internal, outer barrel carries out polishing processing after being welded, guarantees to meet dimension precision requirement, can ensure that the magnetic liquid in the 3rd pole shoe 7 seal clearance is fully cooled like this.
The material that first pole shoe 3, second pole shoe 5, the 3rd pole shoe 7 and axle sleeve 10 select magnetic property good, as electrical pure iron;
First permanent magnet 4, second permanent magnet 6 all selects rubidium iron boron;
The kind of magnetic liquid is according to the magnetic liquid of the different base fluid of the different choice of sealing gas.
Claims (4)
1. ventilated type air cooling magnetic fluid seal device, this device comprises:
Magnetism resistent ring (1), shell (2), the first pole shoe (3), the first permanent magnet (4), the second pole shoe (5), the second permanent magnet (6), the 3rd pole shoe (7), screw (8), end cap (9), axle sleeve (10), the 3rd rubber seal (11), ventilating joint (12), the second rubber seal (13), the first rubber seal (14) and magnetic liquid (15);
Connection between each several part of this device:
Described the first rubber seal (14) is arranged in the groove on the first pole shoe (3) cylindrical, form the first pole shoe of band rubber seal, second rubber seal (13) is arranged in the groove on the second pole shoe (5) cylindrical, form the second pole shoe of band rubber seal, 3rd rubber seal (11) is arranged in the groove on the 3rd pole shoe (7) cylindrical, forms the 3rd pole shoe of band rubber seal;
Described magnetism resistent ring (1) is arranged on the right side of rotating shaft boss, axle sleeve (10) is arranged on the right side of magnetism resistent ring (1); 3rd pole shoe order of the second pole shoe of the first pole shoe of band rubber seal, the first permanent magnet (4), band rubber seal, the second permanent magnet (6), band rubber seal is loaded in shell (2) endoporus; By screw (8) and being threaded fixing to end cap (9) and shell (2) on shell (2) end face, make the inner each part axial location of shell (2); Band the first pole shoe of rubber seal, the first permanent magnet (4), the second pole shoe of band rubber seal, the second permanent magnet (6), the 3rd pole shoe of band rubber seal, end cap (9) are inserted in rotating shaft together with shell (2), by shell (2) flange plate is threaded shell (2) axially locating; In an assembling process, after the first permanent magnet (4) and the second permanent magnet (6) are installed, in the endoporus of the first permanent magnet (4) and the second permanent magnet, inject magnetic liquid;
It is characterized in that:
First pole shoe (3), the first permanent magnet (4) and the second pole shoe (5) form sealed chamber I, for sealing sealed medium;
Second pole shoe (5), the second permanent magnet (6) and the 3rd pole shoe (7) form sealed chamber II, for sealing cooled gas;
By the vent on ventilating joint (12), shell (2) and the second permanent magnet (6), between sealed chamber II and axle sleeve (10), form the cool cycles passage being used for cooled gas circulation.
2. ventilated type air cooling magnetic fluid seal device according to claim 1, is characterized in that:
Axle sleeve (10) is formed by the sleeve weld that three layers of internal diameter is different, form hollow structure, being processed with a through hole in the position being positioned at sealed chamber II for entering cooling air, being processed with a through hole for going out cooling air at end, the through-hole diameter entering cooling air is greater than the through-hole diameter of cooling air.
3. ventilated type air cooling magnetic fluid seal device according to claim 1, is characterized in that:
Inlet hole on axle sleeve (10) and the position of air outlet hole are 180 ° and distribute.
4. ventilated type air cooling magnetic fluid seal device according to claim 1, is characterized in that:
Shell (2) and the second permanent magnet (6) are respectively processed with 1 vent, and in assembly process, two vent positions are identical, form path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410380193.8A CN104165230B (en) | 2014-08-04 | 2014-08-04 | Ventilation type air cooling magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410380193.8A CN104165230B (en) | 2014-08-04 | 2014-08-04 | Ventilation type air cooling magnetic liquid sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104165230A CN104165230A (en) | 2014-11-26 |
| CN104165230B true CN104165230B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410380193.8A Expired - Fee Related CN104165230B (en) | 2014-08-04 | 2014-08-04 | Ventilation type air cooling magnetic liquid sealing device |
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| CN (1) | CN104165230B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482213A (en) * | 2014-12-15 | 2015-04-01 | 青岛科技大学 | Internal mixer rotor sealing device |
| CN106812948B (en) * | 2017-02-23 | 2018-05-04 | 北京交通大学 | The variable magnetic fluid seal device of seal clearance |
| CN113108064B (en) * | 2021-04-29 | 2022-03-25 | 北京交通大学 | Modularized magnetic liquid sealing device |
| CN113324038B (en) * | 2021-05-17 | 2022-04-22 | 清华大学 | Method for making magnetic liquid sealing device resistant to high temperature |
| CN113324039B (en) * | 2021-05-17 | 2022-03-11 | 清华大学 | Method for reducing starting torque of magnetic liquid sealing device |
| CN114370508B (en) * | 2021-12-23 | 2023-02-21 | 清华大学 | Magnetic liquid sealing device with cooling system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991588A (en) * | 1975-04-30 | 1976-11-16 | General Electric Company | Cryogenic fluid transfer joint employing a stepped bayonet relative-motion gap |
| JPS55152962A (en) * | 1979-05-14 | 1980-11-28 | Fuji Electric Co Ltd | Magnetic fluid seal device |
| US4894007A (en) * | 1988-12-12 | 1990-01-16 | Thomson Consumer Electronics | Apparatus for providing fluid to a rotatable member |
| JPH04321881A (en) * | 1991-04-23 | 1992-11-11 | Tokin Corp | Magnetic seal rotation introducing machine |
| CN201297390Y (en) * | 2008-11-11 | 2009-08-26 | 中芯国际集成电路制造(上海)有限公司 | Magneto-fluid cooling structure and corresponding magneto-fluid sealing device |
-
2014
- 2014-08-04 CN CN201410380193.8A patent/CN104165230B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991588A (en) * | 1975-04-30 | 1976-11-16 | General Electric Company | Cryogenic fluid transfer joint employing a stepped bayonet relative-motion gap |
| JPS55152962A (en) * | 1979-05-14 | 1980-11-28 | Fuji Electric Co Ltd | Magnetic fluid seal device |
| US4894007A (en) * | 1988-12-12 | 1990-01-16 | Thomson Consumer Electronics | Apparatus for providing fluid to a rotatable member |
| JPH04321881A (en) * | 1991-04-23 | 1992-11-11 | Tokin Corp | Magnetic seal rotation introducing machine |
| CN201297390Y (en) * | 2008-11-11 | 2009-08-26 | 中芯国际集成电路制造(上海)有限公司 | Magneto-fluid cooling structure and corresponding magneto-fluid sealing device |
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| CN104165230A (en) | 2014-11-26 |
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