CN1614239A - Magnetic liquid sealing structure of cryogenic pump - Google Patents
Magnetic liquid sealing structure of cryogenic pump Download PDFInfo
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- CN1614239A CN1614239A CN 200410070540 CN200410070540A CN1614239A CN 1614239 A CN1614239 A CN 1614239A CN 200410070540 CN200410070540 CN 200410070540 CN 200410070540 A CN200410070540 A CN 200410070540A CN 1614239 A CN1614239 A CN 1614239A
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- magnetic liquid
- liquid sealing
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Abstract
A magnetic liquid sealing structure for the shaft of cryogenic pump is composed of the vacuum balance unit made of the overlapped labyrinth sheets for preventing the crygenic liquid from flowing upward, the magnetic liquid sealing unit consisting of magnetic liquid storing ring, permanent magnet and magnetically conductive shaft sleeve for preventing gas leakage, and the gas isolating unit composed of aerating cavity, cooling cavity, gas inlet nozzle and gas outlet nozzle for isolating low-pressure segment from high-pressure one.
Description
Technical field
The present invention relates to a kind of magnetic liquid sealing structure that is used on the cyropump, belong to low-temperature deep pump field.
Background technique
Rotation axis seal is a key problem in technology of low-temperature deep pump, and commonly used have mechanical seal, packing seal and labyrinth sealing.These three kinds of sealing means all can not solve the axial seal problem of the cyropump of long-time running well.What adopt on the liquid oxygen pump of the maximum of present domestic independent development production is inflation labyrinth+flexible filler formula combination seal, though available used filler must often be changed.Though the magnetic liquid sealing is a kind of new technology, it only is applicable to the working environment of 0～+ 80 at present.Along with the continuous development of science and technology, high-tech areas such as space flight are had higher requirement to sealing technique, and cross-cutting novel seal technology just is born under these circumstances.Its appearance has solved the sealing problem of running shaft under the domestic low-temperature deep environment.
Summary of the invention
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, provide a kind of flexible filler and static and dynamic sealing that does not need often to change running shaft effective, be used for the magnetic liquid sealing structure on the cyropump.This structure can prevent sealed cryogenic media (liquid oxygen, liquid nitrogen, liquid argon) along running shaft " scurry out ", cryogenic media (liquid oxygen, liquid nitrogen, liquid argon) or its bog can not directly contact magnetic liquid sealing part; And can prevent the problem that causes magnetic liquid to heat up and lost efficacy along with the raising of the increase of the running shaft diameter of axle or rotating speed.
The technical solution adopted for the present invention to solve the technical problems is: the magnetic liquid sealing structure on the cyropump, it is characterized in that: comprise superposed decompression balanced controls, be positioned at the gas barrier mechanism at middle part and be positioned at the magnetic liquid sealing mechanism of bottom, the inside of above-mentioned three mechanisms tightly is placed on the cyropump pump shaft, the lower end of pump shaft is closely linked by the suction chamber upper end of flange and pump, and the outside of above-mentioned three mechanisms constitutes an integral body by housing.
Described decompression balanced controls are formed by being funnel-like labyrinth section lamination, between every twice lamination washer spacer are arranged, and the equidistant lamination of arranging forms labyrinth section, looping gap between labyrinth section lamination and the running shaft.
Described magnetic liquid sealing mechanism is made up of magnetic liquid storage pendular ring, permanent magnet and magnetic conduction axle sleeve, magnetic liquid storage pendular ring and permanent magnet are alternately arranged and are loaded among the housing of magnetic liquid sealing mechanism, form the annular space between they and the magnetic conduction axle sleeve, the magnetic conductive axis cover is placed on the pump shaft, with the running shaft close-coupled, and the low temperature O-ring seals that prevents that gas from leaking along axle is housed up and down.
Described gas barrier mechanism is chewed to chew with exhaust by inflatable chamber, cooling chamber, air inlet and forms, the stage casing of housing constitutes inflatable chamber with the upper-end surface of decompression balanced controls and the lower end surface of magnetic liquid sealing mechanism, the outer cylinder surface of the epimere of housing and magnetic liquid sealing mechanism constitutes cooling chamber, inflatable chamber and cooling chamber respectively have an air inlet to chew with exhaust to chew, and two air inlets are chewed to chew tightly with exhaust and are associated on the housing.
Principle of the present invention is: quote the pressurized gas (pressure is a bit larger tham pump inlet pressure) with certain pressure and enter separate cavities, form isolated area between magnetic liquid sealing mechanism and decompression balanced controls, cold junction is not directly contacted with the hot junction; Some roads lamination in the decompression balanced controls constitutes the resistance section, pressure just reduced after cryogenic media was whenever crossed one lamination, in like manner the pressurized gas in the separate cavities whenever cross from top to bottom behind one lamination the also corresponding reduction of pressure some, last the two a certain position in this mechanism reaches pressure balance, and either party is difficult to enter the other side zone.
The present invention's beneficial effect compared with prior art is: (1) replaces the axial rotary seal form of cyropump in the past, has avoided the trouble of frequent replacing flexible filler; (2) the dynamic and static favorable sealing property that on cyropump, adds of the present invention, the maximum bearing capacity of magnetic liquid sealing is 1.6Mpa, and simple in structure, reliability is high, can use for a long time.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
As shown in Figure 1, embodiments of the invention are made up of superposed decompression balanced controls 1, the magnetic liquid sealing mechanism 2 that is positioned at the gas barrier mechanism 3 at middle part and is positioned at the bottom, the inside of above-mentioned three mechanisms tightly is placed on the cyropump pump shaft 4, the lower end of pump shaft 4 is closely linked by the suction chamber upper end of flange and pump, and the outside of above-mentioned three mechanisms constitutes an integral body by housing 5.
As shown in Figure 1, decompression balanced controls 1 are made up of labyrinth, some roads lamination 10, and lamination 10 is funnel-like, have pad to isolate between every twice lamination, the equidistant lamination of arranging 10 in some roads is formed the labyrinth section, constitutes small annular space, some roads in this section between lamination 10 and the pump shaft 4.
The effect of decompression balanced controls 1 is: liquid oxygen (or liquid nitrogen, liquid argon) or vaporized oxygen (or nitrogen, argon) are rushed in the labyrinth section under the inlet pressure of pump; crossing a lot of " door " back pressure just will reduce; at last stage casing and the shielding gas in this mechanism reaches pressure balance, makes shielding gas and liquid oxygen (or gas oxygen) all can not cross this road fully and reduces pressure section and enter the other side's zone.
Magnetic liquid sealing mechanism 2 is made up of magnetic liquid storage pendular ring 20, permanent magnet 21 and magnetic conduction axle sleeve 22, magnetic liquid storage pendular ring 20 is alternately arranged with permanent magnet 21 and is loaded among the housing of magnetic liquid sealing mechanism 2, form small annular space between they and the magnetic conduction axle sleeve 22, magnetic conduction axle sleeve 22 is placed on the pump shaft 4, with pump shaft 4 close-coupled, and the low temperature round section joint ring 23 that prevents that gas from leaking along axle is housed up and down.
Magnetic liquid sealing mechanism 2 is the magnetic field that utilizes the magnetic energy in the permanent magnet to produce, magnetic liquid in magnet ring (storage pendular ring) groove is tightly held, constitute closed magnetic circuit, form magnetic liquid round section joint ring by magnet ring and magnetic conduction axle sleeve, the annular space of magnet ring and magnetic conductive axis inner room is blocked, reach sealing purpose.Can guarantee under the pressure of 1.6MPa do not have to leak being lower than.
Entire work process of the present invention is as follows: the shielding gas with certain pressure is (as nitrogen N
2) chew 32 through air inlet and enter inflatable chamber 30, between decompression balanced controls 1 and magnetic liquid sealing mechanism 2, formed isolated area.On top: the gap between magnetic conduction axle sleeve 22 and the pump shaft 4, the gap between the shell of magnetic liquid sealing mechanism 2 and permanent magnet 21 external diameter surfaces, seal by O shape circle in the gap that inflatable chamber 30 and cooling chamber are 31; Magnetic liquid in the storage pendular ring 20 constitutes closed magnetic circuit with storage pendular ring 20, magnetic conduction axle sleeve 22 and permanent magnet 21 under the effect in permanent magnet 21 magnetic fields, magnetic liquid tightly is adsorbed on the magnetic conduction axle sleeve 22-is formed magnetic liquid " O shape circle " 23 the magnetic conduction axle sleeve 22 and the annular space of storing between the pendular ring 20 are tightly blocked, so the pressed gas in the inflatable chamber 30 is nonpassage up, flow downward and reduce pressure gradually through lamination labyrinth section, at last on a certain position, this section middle part with on the cryogenic media of scurrying reach pressure balance, chew the temperature range that 33 different opening can be adjusted inflatable chamber 30 by exhaust.
Be to be static seal when pump shaft does not rotate, inflatable chamber 30 needn't charge into cooled gas.Pump shaft 4 is to be motive sealing when rotating, and this moment, magnetic liquid was given birth to heat because of friction.Follow by the rising magnetic liquid temp of envelope increase of the diameter of axle or rotating speed is also poly-thereupon to increase, this moment by the air inlet of cooling chamber 31 chew 32 feed cooled gases can be within tolerance zone with magnetic liquid temperature rise control.
Claims (4)
1, the magnetic liquid sealing structure on the cyropump, it is characterized in that: comprise superposed decompression balanced controls (1), be positioned at the gas barrier mechanism (3) at middle part and be positioned at the magnetic liquid sealing mechanism (2) of bottom, the inside of above-mentioned three mechanisms tightly is placed on the deep cooling pump shaft (4), and the outside of above-mentioned three mechanisms constitutes an integral body by housing (5).
2, the magnetic liquid sealing structure on the cyropump according to claim 1, it is characterized in that: described decompression balanced controls (1) are formed by being funnel-like labyrinth section lamination (10), between every twice lamination washer spacer is arranged, the equidistant lamination of arranging forms labyrinth section, looping gap between labyrinth section lamination (10) and the pump shaft (4).
3, the magnetic liquid sealing structure on the cyropump according to claim 1, it is characterized in that: described magnetic liquid sealing mechanism (2) is made up of magnetic liquid storage pendular ring (20), permanent magnet (21) and magnetic conduction axle sleeve (22), magnetic liquid storage pendular ring (20) is alternately arranged with permanent magnet (21) and is loaded among the housing of magnetic liquid sealing mechanism (2), form the annular space between they and the magnetic conduction axle sleeve (22), magnetic conduction axle sleeve (22) is placed on the pump shaft (4), with pump shaft (4) close-coupled, and the low temperature O shape circle (23) that prevents that gas from leaking along axle is housed up and down.
4, magnetic liquid sealing structure on the cyropump according to claim 1, it is characterized in that: described gas barrier mechanism (3) is by inflatable chamber (30), cooling chamber (31), (32) are chewed in air inlet and (33) composition is chewed in exhaust, the stage casing of housing (5) constitutes inflatable chamber (30) with the upper-end surface of decompression balanced controls (1) and the lower end surface of magnetic liquid sealing mechanism (2), the outer cylinder surface of the epimere of housing (5) and magnetic liquid sealing mechanism (2) constitutes cooling chamber (31), inflatable chamber (30) and cooling chamber (31) respectively have an air inlet to chew (32) and (33) are chewed in exhaust, and (32) are chewed in two air inlets and exhaust is chewed (33) and tightly is associated on the housing (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410070540 CN1614239A (en) | 2004-08-09 | 2004-08-09 | Magnetic liquid sealing structure of cryogenic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410070540 CN1614239A (en) | 2004-08-09 | 2004-08-09 | Magnetic liquid sealing structure of cryogenic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1614239A true CN1614239A (en) | 2005-05-11 |
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ID=34765174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410070540 Pending CN1614239A (en) | 2004-08-09 | 2004-08-09 | Magnetic liquid sealing structure of cryogenic pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1614239A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865291A (en) * | 2010-07-14 | 2010-10-20 | 哈尔滨工业大学 | Magnetic fluid sealing structure applied to high-cleanliness environment |
| CN105465373A (en) * | 2016-01-28 | 2016-04-06 | 自贡兆强环保科技股份有限公司 | High-performance magnetic liquid sealing structure |
| CN108443169A (en) * | 2018-05-29 | 2018-08-24 | 宜兴市宙斯泵业有限公司 | A kind of centrifugation shurry pump with air shaft sealing device |
-
2004
- 2004-08-09 CN CN 200410070540 patent/CN1614239A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865291A (en) * | 2010-07-14 | 2010-10-20 | 哈尔滨工业大学 | Magnetic fluid sealing structure applied to high-cleanliness environment |
| CN101865291B (en) * | 2010-07-14 | 2012-08-29 | 哈尔滨工业大学 | Magnetic fluid sealing structure applied to high-cleanliness environment |
| CN105465373A (en) * | 2016-01-28 | 2016-04-06 | 自贡兆强环保科技股份有限公司 | High-performance magnetic liquid sealing structure |
| CN105465373B (en) * | 2016-01-28 | 2017-10-13 | 自贡兆强环保科技股份有限公司 | A kind of high performance magnetic liquid sealing structure |
| CN108443169A (en) * | 2018-05-29 | 2018-08-24 | 宜兴市宙斯泵业有限公司 | A kind of centrifugation shurry pump with air shaft sealing device |
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20050511 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |