CN220566579U - Magnetic fluid sealing device for shaft end of steam turbine - Google Patents
Magnetic fluid sealing device for shaft end of steam turbine Download PDFInfo
- Publication number
- CN220566579U CN220566579U CN202321994354.3U CN202321994354U CN220566579U CN 220566579 U CN220566579 U CN 220566579U CN 202321994354 U CN202321994354 U CN 202321994354U CN 220566579 U CN220566579 U CN 220566579U
- Authority
- CN
- China
- Prior art keywords
- sealing device
- sleeve
- movable ring
- magnetic fluid
- shaft body
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- 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.)
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Links
- 238000007789 sealing Methods 0.000 title claims abstract description 56
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The utility model relates to a sealing device, in particular to a magnetic fluid sealing device for the shaft end of a steam turbine, which comprises a sealing device body, wherein two ends of the sealing device body are connected with sleeves, the interiors of the sleeves are connected with a plurality of groups of connecting blocks in a sliding manner, balls are connected onto the connecting blocks in a rotating manner, and movable rings are arranged on the surfaces of the sleeves in a sliding manner. According to the utility model, the plurality of groups of balls around the inside of the sleeve can be tightly abutted around the turbine shaft body and are in rolling contact with the surface of the shaft body through controlling the adjusting assembly, so that the turbine shaft body is positioned at the axial center of the sleeve, and the shaft body can be always kept at the central axial center of the sealing device body when the sealing device body is sleeved on the turbine shaft body under the positioning action of the sleeve positioned at the two ends of the sealing device body, thereby effectively avoiding the installation deviation of the sealing device body, avoiding friction between the turbine shaft body and the inner wall of the sealing device body when the turbine shaft body rotates, and preventing the shaft body or the sealing device from being worn.
Description
Technical Field
The utility model relates to a sealing device, in particular to a magnetic fluid sealing device for the shaft end of a steam turbine.
Background
The magnetic fluid sealing technology is developed on the basis of magnetic fluid, when the magnetic fluid is injected into the gap of the magnetic field, the magnetic fluid can fill the whole gap to form a liquid O-shaped sealing ring, and the magnetic fluid sealing technology can be widely applied to mechanical equipment such as steam turbines and the like.
The existing magnetic fluid sealing device is as disclosed in Chinese patent CN211144584U, but the magnetic fluid sealing device can effectively avoid hard collision and grinding between dynamic and static, avoid abnormal vibration caused by dynamic and static collision and grinding of sealing teeth at the shaft end, and can realize zero clearance of a sealing gap, thereby realizing zero leakage, effectively avoiding the factors such as water in oil and vacuum drop caused by leakage at the shaft end, but the magnetic fluid sealing device lacks effective positioning measures with the turbine shaft body, and because the inner diameter of the sealing device is slightly larger than the diameter of the turbine shaft body, the axial center of the sealing device is offset with the axial center of the turbine shaft body when the sealing device is arranged on the shaft body, so that friction is generated between the turbine shaft body and the inner wall of the sealing device when the turbine shaft body rotates, and the shaft body or the sealing device is abraded.
Disclosure of Invention
Based on the shortcomings in the prior art mentioned in the background art, the utility model provides a magnetic fluid sealing device for a shaft end of a steam turbine.
The utility model adopts the following technical scheme to overcome the technical problems, and specifically comprises the following steps:
the magnetic fluid sealing device for the shaft end of the steam turbine comprises a sealing device body, wherein two ends of the sealing device body are connected with sleeves, a plurality of groups of connecting blocks are connected in a sliding manner in the sleeves, balls are connected to the connecting blocks in a rotating manner, and movable rings are arranged on the surfaces of the sleeves in a sliding manner; the sleeve is provided with a first guiding component between the movable ring and the sleeve, an adjusting component acting on the movable ring is arranged between the sleeve and the movable ring, a second guiding component is arranged between the sleeve and a plurality of groups of connecting blocks, and a driving component acting on the movable ring is arranged between the movable ring and the connecting blocks.
As a further scheme of the utility model: the adjusting component comprises an external thread arranged on the surface of the sleeve and a first screw sleeve in threaded connection with the external thread;
wherein, the loose ring rotates to be connected in the one end of first swivel nut.
As still further aspects of the utility model: the sleeve is provided with a guide groove, the inner surface of the movable ring is provided with a guide block, and the guide block is slidably arranged in the guide groove.
As still further aspects of the utility model: the outer surface of the first screw sleeve is sleeved with a hexagonal head.
As still further aspects of the utility model: the driving assembly comprises a plurality of groups of second threaded sleeves rotatably connected to the sleeve and a screw rod which is in threaded connection with the inside of the second threaded sleeves and fixedly connected with the connecting block;
and a transmission assembly is arranged between the movable ring and the second screw sleeve.
As still further aspects of the utility model: the transmission assembly comprises a plurality of groups of racks connected to the movable ring and gears respectively sleeved on the second screw sleeves and meshed with the racks.
As still further aspects of the utility model: the sleeve is provided with a guide hole, a slide bar is arranged in the guide hole in a sliding manner, and one end of the slide bar is fixedly connected with the connecting block.
After adopting the structure, compared with the prior art, the utility model has the following advantages: the ball bearing of a plurality of groups around can be closely contradicted around the turbine shaft body and roll contact with the surface of the shaft body through controlling the adjusting component, so that the turbine shaft body is positioned at the axial center of the sleeve, and when the sleeve positioned at two ends of the sealing device body is positioned, the shaft body can be always kept at the axial center position of the sealing device body when the sealing device body is sheathed on the turbine shaft body, thereby effectively avoiding the installation deviation of the sealing device body, avoiding friction between the turbine shaft body and the inner wall of the sealing device body when the turbine shaft body rotates, and preventing the shaft body or the sealing device from generating abrasion.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic view of the structure of the sleeve and the rack in the present utility model.
FIG. 3 is a schematic view of the structure of the ball and screw of the present utility model.
Fig. 4 is an exploded view of the sleeve, first screw sleeve and loose ring of the present utility model.
Fig. 5 is a schematic structural view of a second screw sleeve and a gear according to the present utility model.
In the figure: 1. a sealing device body; 2. a sleeve; 3. connecting blocks; 4. a ball; 5. a movable ring; 6. an external thread; 7. a first screw sleeve; 8. a guide groove; 9. a guide block; 10. a second screw sleeve; 11. a screw; 12. a rack; 13. a gear; 14. a guide hole; 15. a slide bar; 16. a hexagonal head.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Referring to fig. 1 to 5, in the embodiment of the utility model, a magnetic fluid sealing device for a shaft end of a steam turbine comprises a sealing device body 1, wherein two ends of the sealing device body 1 are connected with a sleeve 2, a plurality of groups of connecting blocks 3 are connected in a sliding manner in the sleeve 2, balls 4 are connected to the connecting blocks 3 in a rotating manner, and a movable ring 5 is arranged on the surface of the sleeve 2 in a sliding manner;
a first guiding component is arranged between the sleeve 2 and the movable ring 5, an adjusting component acting on the movable ring 5 is arranged between the sleeve 2 and the movable ring 5, a second guiding component is arranged between the sleeve 2 and a plurality of groups of connecting blocks 3, and a driving component acting on the movable ring 5 is arranged between the movable ring 5 and the connecting blocks 3;
when the sealing device body 1 is sleeved on the shaft body of the steam turbine, the sleeve pipes 2 at two ends of the sealing device body 1 are sleeved on the outer side of the shaft body of the steam turbine, at the moment, the groups of balls 4 positioned on the inner side of the sleeve pipes 2 are distributed around the shaft end, the movable ring 5 can be controlled to horizontally slide along the surface of the sleeve pipes 2 through the adjusting component, in the process, the driving component can drive the groups of connecting blocks 3 inside the sleeve pipes 2 to move towards the direction close to or far away from the shaft body of the steam turbine at the same time, at the moment, if the groups of connecting blocks 3 are controlled to move towards the direction close to the shaft body at the same time, until the balls 4 rotatably connected on the connecting blocks 3 are in contact with the surface of the shaft body, at the moment, the groups of balls 4 around the inner side of the sleeve pipes 2 are tightly abutted around the shaft body of the steam turbine and in rolling contact with the surface of the shaft body, so that the shaft body of the steam turbine is positioned at the shaft center of the sleeve pipes 2, and under the positioning action of the sleeve pipes 2 positioned at two ends of the sealing device body 1, the shaft body of the sealing device body 1 can be always kept at the shaft center position close to the shaft center of the shaft body 1, the shaft body of the sealing device body 1 is prevented from being worn or the shaft body is prevented from being worn when the sealing device body is mounted on the shaft body and the shaft body is prevented from being rotated.
In one embodiment of the utility model, the adjusting assembly comprises an external thread 6 provided on the surface of the sleeve 2, and a first threaded sleeve 7 screwed onto the external thread 6;
wherein the movable ring 5 is rotatably connected to one end of the first screw sleeve 7;
due to the threaded connection between the external thread 6 and the first threaded sleeve 7, the external thread 6 can be driven by the first threaded sleeve 7 through rotating the external thread 6, so that the external thread 6 moves along the surface of the sleeve 2, and the external thread 6 drives the movable ring 5 to move along the surface of the sleeve 2.
In another embodiment of the present utility model, a guide groove 8 is formed on the sleeve 2, a guide block 9 is disposed on the inner surface of the movable ring 5, and the guide block 9 is slidably disposed inside the guide groove 8;
because the movable ring 5 is rotationally connected to the end part of the first screw sleeve 7, the first screw sleeve 7 drives the movable ring 5 to move, and meanwhile, the guide block 9 can slide in the guide groove 8 under the driving of the movable ring 5, so that the movable ring 5 can move linearly along the surface of the sleeve 2 under the limiting action of the guide groove 8 and the guide block 9 without deflecting along with the movable ring 5.
In a further embodiment of the utility model, the outer surface of the first sleeve 7 is sleeved with a hexagonal head 16;
the hexagonal head 16 is held by a wrench to facilitate rotation of the first sleeve 7.
In a further embodiment of the utility model, the driving assembly comprises a plurality of groups of second threaded sleeves 10 rotatably connected to the sleeve 2, and a screw 11 screwed inside the second threaded sleeves 10 and fixedly connected to the connecting block 3;
wherein a transmission assembly is arranged between the movable ring 5 and the second screw sleeve 10;
when the movable ring 5 moves along the surface of the connecting block 3, the transmission assembly can drive a plurality of groups of second threaded sleeves 10 on the sleeve 2 to simultaneously rotate, and due to the relation of threaded fit between the second threaded sleeves 10 and the threaded rods 11, the threaded rods 11 can be driven to move along the direction of the second threaded sleeves 10 when the second threaded sleeves 10 rotate, and at the moment, the plurality of groups of connecting blocks 3 can simultaneously move towards the direction close to or far away from the shaft body under the driving of the threaded rods 11.
In yet another embodiment of the present utility model, the transmission assembly includes several sets of racks 12 connected to the movable ring 5, and gears 13 respectively sleeved on several sets of the second threaded sleeves 10 and meshed with the racks 12;
when the movable ring 5 moves along the surface of the connecting block 3, the movable ring 5 drives the plurality of groups of racks 12 to move, and because of the meshing relationship between the racks 12 and the gears 13, the plurality of groups of gears 13 rotate under the driving action of the racks 12, so as to drive the plurality of groups of second threaded sleeves 10 to rotate simultaneously.
In yet another embodiment of the present utility model, a guiding hole 14 is formed in the sleeve 2, a sliding rod 15 is slidably disposed in the guiding hole 14, and one end of the sliding rod 15 is fixedly connected with the connecting block 3;
the connecting block 3 cannot rotate in the moving process under the guiding action of the guide hole 14 and the sliding rod 15, so that the screw 11 drives the connecting block 3 to move close to or far away from the turbine shaft body, and simultaneously cannot rotate under the driving of the second screw sleeve 10.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Claims (7)
1. The magnetic fluid sealing device for the shaft end of the steam turbine comprises a sealing device body (1), and is characterized in that two ends of the sealing device body (1) are connected with a sleeve (2), a plurality of groups of connecting blocks (3) are connected inside the sleeve (2) in a sliding manner, balls (4) are connected to the connecting blocks (3) in a rotating manner, and a movable ring (5) is arranged on the surface of the sleeve (2) in a sliding manner; an adjusting component acting on the movable ring (5) is arranged between the sleeve (2) and the movable ring (5), and a driving component acting on the movable ring (5) is arranged between the movable ring (5) and the connecting block (3).
2. A steam turbine shaft end magnetic fluid sealing device according to claim 1, wherein the adjusting assembly comprises an external thread (6) arranged on the surface of the sleeve (2) and a first threaded sleeve (7) in threaded connection with the external thread (6); the movable ring (5) is rotatably connected to one end of the first screw sleeve (7).
3. The magnetic fluid sealing device for the shaft end of the steam turbine according to claim 2, wherein the sleeve (2) is provided with a guide groove (8), the inner surface of the movable ring (5) is provided with a guide block (9), and the guide block (9) is slidably arranged in the guide groove (8).
4. A steam turbine shaft end magnetic fluid sealing device according to claim 2, characterized in that the outer surface of the first screw sleeve (7) is sleeved with a hexagonal head (16).
5. A steam turbine shaft end magnetic fluid sealing device according to claim 1, wherein the driving assembly comprises a plurality of groups of second threaded sleeves (10) rotatably connected to the sleeve (2), and a screw rod (11) which is in threaded connection with the inside of the second threaded sleeves (10) and fixedly connected with the connecting block (3); a transmission component is arranged between the movable ring (5) and the second screw sleeve (10).
6. A steam turbine shaft end magnetic fluid sealing device according to claim 5, wherein the transmission assembly comprises a plurality of groups of racks (12) connected to the movable ring (5), and gears (13) respectively sleeved on a plurality of groups of the second threaded sleeves (10) and meshed with the racks (12).
7. The magnetic fluid sealing device for the shaft end of the steam turbine according to claim 5, wherein the sleeve (2) is provided with a guide hole (14), a sliding rod (15) is slidably arranged in the guide hole (14), and one end of the sliding rod (15) is fixedly connected with the connecting block (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321994354.3U CN220566579U (en) | 2023-07-27 | 2023-07-27 | Magnetic fluid sealing device for shaft end of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321994354.3U CN220566579U (en) | 2023-07-27 | 2023-07-27 | Magnetic fluid sealing device for shaft end of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220566579U true CN220566579U (en) | 2024-03-08 |
Family
ID=90102788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321994354.3U Active CN220566579U (en) | 2023-07-27 | 2023-07-27 | Magnetic fluid sealing device for shaft end of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220566579U (en) |
-
2023
- 2023-07-27 CN CN202321994354.3U patent/CN220566579U/en active Active
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