CN114321385A - Magnetic liquid sealing structure capable of directly observing liquid level shape - Google Patents
Magnetic liquid sealing structure capable of directly observing liquid level shape Download PDFInfo
- Publication number
- CN114321385A CN114321385A CN202210015425.4A CN202210015425A CN114321385A CN 114321385 A CN114321385 A CN 114321385A CN 202210015425 A CN202210015425 A CN 202210015425A CN 114321385 A CN114321385 A CN 114321385A
- Authority
- CN
- China
- Prior art keywords
- sealing
- magnetic liquid
- pole shoe
- bearing
- spacer bush
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 96
- 238000007789 sealing Methods 0.000 title claims abstract description 85
- 125000006850 spacer group Chemical group 0.000 claims abstract description 42
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Images
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a magnetic liquid sealing structure capable of directly observing the shape of a liquid level, which comprises a shell (1), wherein a sealing cavity cover (2) is arranged at the top of the shell (1); the bearing is characterized in that a mounting cavity (3) is arranged in the shell (1), an upper bearing (4) and a lower bearing (5) are respectively arranged at the upper end and the lower end of the mounting cavity (3), stepped shafts (6) which are axially arranged and rotationally connected are jointly arranged in the upper bearing (4) and the lower bearing (5), an upper spacer bush (7) is arranged at the bottom of the upper bearing (4), a C-shaped lower spacer bush (8) which is rotationally connected is arranged at the top of the lower bearing (5), and gaps are reserved between the upper spacer bush (7), the lower spacer bush (8) and the stepped shafts (6); the invention can directly observe the change process of the magnetic liquid film in the pressure loading process, and effectively help the research of the magnetic liquid sealing pressure transmission mechanism and the failure mechanism.
Description
Technical Field
The invention relates to the field of sealing structures, in particular to a magnetic liquid sealing structure capable of directly observing the shape of a liquid level.
Background
The magnetic liquid seal is a very life-rich technology as a young person, has the advantages of zero leakage, long service life, high reliability and the like which cannot be replaced by other traditional seals, and is very suitable for developing high-speed sealing working conditions in some special fields. Under a high-speed working condition, in order to form a closed magnetic loop and increase the magnetic induction intensity in a gap, a pole shoe and a rotating shaft must be processed by materials with good magnetic permeability, a transparent magnetic permeability material does not exist at present, magnetic liquid in the sealed gap is shielded by the pole shoe, and the shape change of a liquid film of the magnetic liquid cannot be directly observed. The sealing gap is too small, and the sectional area of the magnetic liquid film is less than 0.2mm2And the nondestructive detection means such as ultrasonic waves and industrial CT cannot obtain clear images.
Since the magnetic liquid in the magnetic liquid seal is covered by the pole shoe and the shell, how the magnetic liquid rotates the seal liquid level moves and the detection of the surface temperature of the magnetic liquid does not have a solution to the problem. Many researchers in this field derive the motion state of the magnetic liquid rotary seal and the surface temperature thereof from simulation. In the literature, "research on magnetic liquid sealing under high-speed working conditions", researchers have proposed a magnetic liquid static sealing structure for observing the shape of a liquid film, but the device can only be calculated as a simulation structure of the magnetic liquid static sealing, and has a difference for the rotary sealing, so that the device capable of detecting the liquid surface shape and the surface temperature of the magnetic liquid has great significance for the deep research on the magnetic liquid sealing.
Disclosure of Invention
The invention aims to provide a magnetic liquid sealing structure capable of directly observing the shape of a liquid surface. The invention can directly observe the change process of the magnetic liquid film in the pressure loading process, and effectively help the research of the magnetic liquid sealing pressure transmission mechanism and the failure mechanism.
The technical scheme of the invention is as follows: a magnetic liquid sealing structure capable of directly observing the shape of a liquid level comprises a shell, wherein a sealing cavity cover is arranged at the top of the shell; the outer shell is internally provided with an installation cavity, the upper end and the lower end of the installation cavity are respectively provided with an upper bearing and a lower bearing, the upper bearing and the lower bearing are internally and jointly provided with a stepped shaft which is axially arranged and is rotatably connected, the bottom of the upper bearing is provided with an upper spacer bush, the top of the lower bearing is provided with a C-shaped lower spacer bush which is rotatably connected, and gaps are reserved between the upper spacer bush and the stepped shaft as well as between the lower spacer bush and the stepped shaft; a magnetic liquid sealing element is arranged between the upper spacer bush and the lower spacer bush and comprises an annular magnet sleeved on the stepped shaft, the upper side and the lower side of the magnet are respectively provided with an upper pole shoe and a lower pole shoe which are attached to the upper spacer bush and the lower spacer bush, the outer side surfaces of the upper pole shoe and the lower pole shoe are attached to the inner side surface of the mounting cavity, and a sealing gap containing magnetic liquid is arranged between the inner side surfaces of the upper pole shoe and the lower pole shoe and the stepped shaft; and an observation through hole overlapped with the lower spacer bush is formed in the side part of the shell below the lower pole shoe.
In the above magnetic liquid sealing structure capable of directly observing the shape of the liquid level, the lower part of the lower pole shoe is overlapped with the observation through hole.
In the magnetic liquid sealing structure capable of directly observing the liquid level shape, the outer side surfaces of the upper pole shoe and the lower pole shoe are respectively provided with a sealing groove, and the sealing grooves are provided with sealing rings.
In the above magnetic liquid sealing structure capable of directly observing the shape of the liquid level, the top of the housing is provided with a threaded end cover attached to the upper bearing.
In the aforementioned magnetic liquid sealing structure in which the shape of the liquid surface can be directly observed, the end of the stepped shaft is located outside the housing.
In the aforementioned magnetic liquid sealing structure capable of directly observing the shape of the liquid level, an annular sealing gasket is arranged at the lower edge of the sealing cavity cover.
Compared with the prior art, the invention has the following beneficial effects:
1. the top of the shell is provided with a sealing cavity cover; the outer shell is internally provided with an installation cavity, the upper end and the lower end of the installation cavity are respectively provided with an upper bearing and a lower bearing, the upper bearing and the lower bearing are internally and jointly provided with a stepped shaft which is axially arranged and is rotatably connected, the bottom of the upper bearing is provided with an upper spacer bush, the top of the lower bearing is provided with a C-shaped lower spacer bush which is rotatably connected, and gaps are reserved between the upper spacer bush and the stepped shaft as well as between the lower spacer bush and the stepped shaft; a magnetic liquid sealing element is arranged between the upper spacer bush and the lower spacer bush and comprises an annular magnet sleeved on the stepped shaft, the upper side and the lower side of the magnet are respectively provided with an upper pole shoe and a lower pole shoe which are attached to the upper spacer bush and the lower spacer bush, the outer side surfaces of the upper pole shoe and the lower pole shoe are attached to the inner side surface of the mounting cavity, and a sealing gap containing magnetic liquid is arranged between the inner side surfaces of the upper pole shoe and the lower pole shoe and the stepped shaft; an observation through hole overlapped with the lower spacer bush is formed in the side part of the shell below the lower pole shoe; magnetic liquid is injected into the magnetic liquid sealing element, a plurality of sealing liquid films are formed in a sealing gap by the magnetic liquid, pressure is applied from the sealing cavity cover, the magnetic liquid moves towards the low-pressure side along the trend, meanwhile, magnetic field force borne by the magnetic liquid is directed to the high-pressure side from the low-pressure side and is balanced with the pressure difference, when the pressure difference of two sides exceeds the pressure resistance of a single pole tooth, the innermost sealing liquid film is broken, the pressure is transmitted to the next sealing liquid film, when the pressure breaks through the last sealing liquid film, the magnetic liquid seal leaks, before that, the last sealing liquid film in the inner part is exposed outside by rotating the lower spacer bush, and related detection equipment is arranged towards the observation through hole to directly observe the boundary state and the surface temperature of the magnetic liquid.
2. The lower part of the lower pole shoe is overlapped with the observation through hole, and after the lower spacer sleeve is rotated, part of the lower pole shoe is exposed outside to prevent the lower pole shoe from being hidden in the mounting cavity, so that the state of the magnetic liquid when the last annular sealing liquid film is broken can be observed in time.
3. The outer side surfaces of the upper pole shoe and the lower pole shoe are respectively provided with the sealing groove, and the sealing rings are arranged on the sealing grooves, so that the sealing property is effectively enhanced, and the normal flow of the magnetic liquid is ensured.
4. The top of the shell is provided with the threaded end cover attached to the upper bearing, and the threaded end cover is screwed to be pressed downwards, so that the internal structure is tighter, and the sealing effect is further improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic structural view of the lower pole piece portion of the present invention;
fig. 4 is a schematic sectional view of the housing of the present invention.
The labels in the figures are: 1-a housing; 2-sealing the cavity cover; 3-installing a cavity; 4-an upper bearing; 5-a lower bearing; 6-a stepped shaft; 7-arranging a spacer bush; 8-lower spacer bush; 9-magnetic liquid seal; 10-a magnet; 11-upper pole shoe; 12-lower pole shoe; 13-sealing the gap; 14-viewing through holes; 15-sealing groove; 16-a sealing ring; 17-a threaded end cap; 18-sealing gasket.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example (b): a magnetic liquid sealing structure capable of directly observing the shape of a liquid surface is shown in figures 1 and 4 and comprises a shell 1, wherein a sealing cavity cover 2 is arranged at the top of the shell 1; the shell 1 is internally provided with a mounting cavity 3, as shown in fig. 2, the upper end and the lower end of the mounting cavity 3 are respectively provided with an upper bearing 4 and a lower bearing 5 which are arranged on shaft shoulders on the corresponding sides, the upper bearing 4 and the lower bearing 5 are internally provided with a stepped shaft 6 which is axially arranged and rotationally connected together, the rotation is realized by arranging the bearings in the upper bearing 4 and the lower bearing 5, the bottom of the upper bearing 4 is provided with an upper spacer 7, the top of the lower bearing 5 is provided with a C-shaped lower spacer 8 which is rotationally connected, and gaps are reserved between the upper spacer 7 and the stepped shaft 6 as well as between the lower spacer 8 and the stepped shaft 6; a magnetic liquid sealing element 9 is arranged between the upper spacer 7 and the lower spacer 8, the magnetic liquid sealing element 9 comprises an annular magnet 10 sleeved on the stepped shaft 6, an upper pole shoe 11 and a lower pole shoe 12 which are attached to the upper side and the lower side of the magnet 10 respectively, the outer side surfaces of the upper pole shoe 11 and the lower pole shoe 12 are attached to the inner side surface of the mounting cavity 3, and a sealing gap 13 containing magnetic liquid is arranged between the inner side surfaces of the upper pole shoe 11 and the lower pole shoe 12 and the stepped shaft 6; an observation through hole 14 overlapped with the lower spacer 8 is formed in the side portion of the shell 1 below the lower pole shoe 12, the opening width of the observation through hole 14 is 30% -80% of the diameter of the shell 1, the height of the observation through hole 14 is smaller than that of the lower spacer 8, and the observation through hole 14 is larger than 20 mm; as shown in fig. 3, the lower part of the lower pole piece 12 overlaps with the observation through hole 14; the outer side surfaces of the upper pole shoe 11 and the lower pole shoe 12 are respectively provided with a sealing groove 15, and a sealing ring 16 is arranged on each sealing groove 15; the top of the shell 1 is provided with a threaded end cover 17 which is attached to the upper bearing 4; the end of the stepped shaft 6 is positioned outside the housing 1 and is rotated by connecting a driving device; an annular sealing gasket 18 is arranged at the lower edge of the sealing cavity cover 2; and detection equipment is arranged outside the observation through hole and comprises a high-speed camera, a thermocouple and a thermal imaging sensor.
The working principle is as follows: magnetic liquid is injected into the magnetic liquid sealing element, a plurality of sealing liquid films are formed in a sealing gap by the magnetic liquid, pressure is applied from the sealing cavity cover, the magnetic liquid moves towards the low-pressure side along the trend, meanwhile, magnetic field force borne by the magnetic liquid is directed to the high-pressure side from the low-pressure side and is balanced with the pressure difference, when the pressure difference of two sides exceeds the pressure resistance of a single pole tooth, the innermost sealing liquid film is broken, the pressure is transmitted to the next sealing liquid film, when the pressure breaks through the last sealing liquid film, the magnetic liquid seal leaks, before that, the last sealing liquid film in the inner part is exposed outside by rotating the lower spacer bush, and related detection equipment is arranged towards the observation through hole to directly observe the boundary state and the surface temperature of the magnetic liquid.
Claims (6)
1. A magnetic liquid sealing structure capable of directly observing liquid level shape is characterized in that: comprises a shell (1), wherein the top of the shell (1) is provided with a sealing cavity cover (2); the bearing is characterized in that a mounting cavity (3) is arranged in the shell (1), an upper bearing (4) and a lower bearing (5) are respectively arranged at the upper end and the lower end of the mounting cavity (3), stepped shafts (6) which are axially arranged and rotationally connected are jointly arranged in the upper bearing (4) and the lower bearing (5), an upper spacer bush (7) is arranged at the bottom of the upper bearing (4), a C-shaped lower spacer bush (8) which is rotationally connected is arranged at the top of the lower bearing (5), and gaps are reserved between the upper spacer bush (7), the lower spacer bush (8) and the stepped shafts (6); a magnetic liquid sealing element (9) is arranged between the upper spacer bush (7) and the lower spacer bush (8), the magnetic liquid sealing element (9) comprises an annular magnet (10) sleeved on the stepped shaft (6), an upper pole shoe (11) and a lower pole shoe (12) which are attached to the upper side and the lower side of the magnet (10) respectively, the outer side surfaces of the upper pole shoe (11) and the lower pole shoe (12) are attached to the inner side surface of the mounting cavity (3), and a sealing gap (13) containing magnetic liquid is arranged between the inner side surfaces of the upper pole shoe (11) and the lower pole shoe (12) and the stepped shaft (6); an observation through hole (14) overlapped with the lower spacer bush (8) is arranged at the side part of the shell (1) below the lower pole shoe (12).
2. The magnetic liquid sealing structure capable of directly observing the shape of a liquid surface according to claim 1, characterized in that: the lower part of the lower pole shoe (12) is overlapped with the observation through hole (14).
3. The magnetic liquid sealing structure capable of directly observing the shape of a liquid surface according to claim 1, characterized in that: and sealing grooves (15) are formed in the outer side surfaces of the upper pole shoe (11) and the lower pole shoe (12), and sealing rings (16) are arranged on the sealing grooves (15).
4. The magnetic liquid sealing structure capable of directly observing the shape of a liquid surface according to claim 1, characterized in that: the top of the shell (1) is provided with a threaded end cover (17) which is attached to the upper bearing (4).
5. The magnetic liquid sealing structure capable of directly observing the shape of a liquid surface according to claim 1, characterized in that: the end of the stepped shaft (6) is located outside the housing (1).
6. The magnetic liquid sealing structure capable of directly observing the shape of a liquid surface according to claim 1, characterized in that: and an annular sealing gasket (18) is arranged at the lower edge of the sealing cavity cover (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210015425.4A CN114321385A (en) | 2022-01-07 | 2022-01-07 | Magnetic liquid sealing structure capable of directly observing liquid level shape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210015425.4A CN114321385A (en) | 2022-01-07 | 2022-01-07 | Magnetic liquid sealing structure capable of directly observing liquid level shape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114321385A true CN114321385A (en) | 2022-04-12 |
Family
ID=81025730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210015425.4A Pending CN114321385A (en) | 2022-01-07 | 2022-01-07 | Magnetic liquid sealing structure capable of directly observing liquid level shape |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114321385A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072326A (en) * | 2011-01-24 | 2011-05-25 | 北京交通大学 | Magnetic liquid sealing process researching device |
| CN206248320U (en) * | 2016-12-01 | 2017-06-13 | 中国石油大学(华东) | A kind of new Type of Liquid Membrane seals observation of cavitation experimental provision |
| CN206248285U (en) * | 2016-10-12 | 2017-06-13 | 中国石油大学(华东) | A kind of mechanical seal end surface liquid film phase transformation visual experimental apparatus |
| CN107842613A (en) * | 2017-12-13 | 2018-03-27 | 广西科技大学 | A kind of arc step formula device for sealing magnetic fluid |
-
2022
- 2022-01-07 CN CN202210015425.4A patent/CN114321385A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072326A (en) * | 2011-01-24 | 2011-05-25 | 北京交通大学 | Magnetic liquid sealing process researching device |
| CN206248285U (en) * | 2016-10-12 | 2017-06-13 | 中国石油大学(华东) | A kind of mechanical seal end surface liquid film phase transformation visual experimental apparatus |
| CN206248320U (en) * | 2016-12-01 | 2017-06-13 | 中国石油大学(华东) | A kind of new Type of Liquid Membrane seals observation of cavitation experimental provision |
| CN107842613A (en) * | 2017-12-13 | 2018-03-27 | 广西科技大学 | A kind of arc step formula device for sealing magnetic fluid |
Non-Patent Citations (1)
| Title |
|---|
| 陈一镖: "高速工况下磁性液体密封的研究", 北京科技大学博士学位论文, pages 69 - 70 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100406790C (en) | Mechanical seal device | |
| CN106641273B (en) | A kind of chemical reactor magnetic fluid seal device and its control system | |
| US2354478A (en) | Shaft seal | |
| US3717352A (en) | Seal for rotatable covers of nuclear reactors | |
| CN108397482A (en) | A kind of large size bearing sealing device | |
| CN106233048A (en) | There is the shaft seal assembly of pollution detection system | |
| US4426088A (en) | Centrifugal fluid seal with drain holes and fluid diverting means | |
| CN114321385A (en) | Magnetic liquid sealing structure capable of directly observing liquid level shape | |
| CN110601420A (en) | Magnetic fluid sealing positive pressure type explosion-proof motor | |
| CN100370146C (en) | Mechaniclly sealing device of immersible pump | |
| CN112360801A (en) | High leakproofness centrifugal pump based on double containment formula is packed | |
| CN104315150B (en) | Rotary lip labyrinth sealing device | |
| CN112728111B (en) | Magnetic liquid sealing device | |
| CN214404696U (en) | High-speed magnetic liquid sealing device | |
| CN211820745U (en) | Precision machinery rotating sealing device | |
| CN208348107U (en) | The sealing system of submerged pump | |
| CN209145900U (en) | A kind of magnetic drive pump Double-layered isolation casing | |
| CN212804228U (en) | Double-seal ring waterproof sealing structure | |
| CN206539702U (en) | A kind of sealed protective structure | |
| CN211039622U (en) | Wind-powered electricity generation gear box seal structure | |
| CN218669907U (en) | Magnetic fluid lubrication magnetic thrust bearing for water pump | |
| CN214326313U (en) | Carrier roller sealing device | |
| CN218669910U (en) | Novel shaft end sealing device for pump | |
| CN213419888U (en) | Gas protection type mechanical seal | |
| CN214008074U (en) | Floating ring type magnetic liquid sealing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |