CN109261378B - Main shaft dynamic sealing structure of large-scale high-speed geotechnical centrifuge - Google Patents
Main shaft dynamic sealing structure of large-scale high-speed geotechnical centrifuge Download PDFInfo
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- CN109261378B CN109261378B CN201811384198.2A CN201811384198A CN109261378B CN 109261378 B CN109261378 B CN 109261378B CN 201811384198 A CN201811384198 A CN 201811384198A CN 109261378 B CN109261378 B CN 109261378B
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- main shaft
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- packing
- shaped bolt
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- 238000007789 sealing Methods 0.000 title claims abstract description 53
- 210000004907 gland Anatomy 0.000 claims abstract description 45
- 238000012856 packing Methods 0.000 claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 230000006835 compression Effects 0.000 claims abstract description 20
- 238000007906 compression Methods 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000007770 graphite material Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B7/00—Elements of centrifuges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
Abstract
The invention discloses a main shaft dynamic sealing structure of a large high-speed geotechnical centrifuge, which has strong adaptability, and comprises a combined sealing mode of a plurality of labyrinth sealing structures, a spiral sealing structure and a packing sealing structure, so that the main shaft dynamic sealing structure is applicable to vacuum dynamic sealing and oil sealing can be realized under normal pressure; the service life is long, and the worn packing seal can be opened according to the requirement through the structure of the first screw, the pressing mechanism and the gland combination and is only used in a few times of vacuumizing the centrifuge chamber; the vacuum dynamic seal has strong reliability, and the compression mechanism with the spring is designed to ensure that the gland can still compress the filler after the filler is worn; the pressing mechanism is easy to replace and switch, and the pressing mechanism is convenient to replace by arranging an arc groove and a T-shaped groove which correspond to the pressing mechanism on the pressing cover and the stationary ring respectively; the compressing mechanism is provided with the limiting sleeve, so that the compressing amount of each compressing mechanism spring is consistent, and the manual operation difficulty is reduced.
Description
Technical Field
The invention belongs to the technical field of geotechnical centrifuges, and particularly relates to a main shaft dynamic sealing structure of a large-sized high-speed geotechnical centrifuge.
Background
In the geotechnical engineering field, a geotechnical centrifugal model test is to put a scaled geotechnical model (the dimension in each direction is 1/n of that of an original soil body) into a geotechnical centrifuge rotating at high speed, and reproduce the stress state of the original soil body by utilizing the centrifugal force field effect of n times of gravity acceleration (also known as ng) (related data are shown in Gu Puzhao. Steady-state acceleration simulation experiment equipment-centrifuge theory and design [ M ]. Beijing: national defense industry press, 2013). In recent years, the scale of the geotechnical centrifuge is larger and larger, the achievable centrifugal acceleration is also higher and the large-scale and high-acceleration centrifuge is called a large-scale and high-speed geotechnical centrifuge. When the large high-speed geotechnical centrifuge runs at a high g value, a large amount of energy can be consumed due to the resistance of air to the high-speed rotating part, and in order to reduce the energy consumption, the centrifuge chamber can be vacuumized so as to reduce the driving power of the centrifuge. Because low air pressure has a certain influence on certain test results, the vacuum pumping of the centrifuge chamber is mostly used for high-speed test working conditions, and the centrifuge is operated at normal air pressure for more time.
In order to realize the vacuum pumping of the centrifuge chamber, besides the static seal design of the whole chamber, the dynamic seal design of the main shaft supporting the centrifuge rotating part is also required to be carried out so as to prevent the lubricating oil and air in the main shaft bearing box from being pumped into the chamber under the vacuum of the chamber. The main shaft dynamic seal of the large-scale high-speed geotechnical centrifuge has the following difficulties: the diameter of the main shaft is overlarge, often exceeds 500mm, even exceeds 1000mm; the maximum linear velocity at the seal is high, often exceeding 20m/s, which makes many sealing modes unusable; because the supported rotating member has too large mass, the sealing member is not allowed to be replaced frequently, and therefore the service life of the sealing member is required to be high; the vacuum dynamic seal under short-time operation is realized, and the oil seal is realized under normal pressure; the geotechnical centrifuge belongs to test equipment and needs to be started and stopped frequently. Because of the above difficulties, the use of conventional sealing products is limited, and if not, the sealing effect is poor or the working life is short.
In order to solve the problems, a main shaft dynamic sealing structure of a large-scale high-speed geotechnical centrifuge is developed.
Disclosure of Invention
The invention aims to solve the problems and provide a main shaft dynamic sealing structure of a large-scale high-speed geotechnical centrifuge.
The invention realizes the above purpose through the following technical scheme:
large-scale high-speed geotechnique centrifuge main shaft moves seal structure includes:
a spiral seal structure; the spiral sealing structure consists of a main shaft and a stationary ring, a gap is arranged between the main shaft and the stationary ring, a multi-head rectangular thread is arranged on the outer diameter side surface of the main shaft collar, and the multi-head rectangular thread is used for driving a sealing medium downwards when the centrifugal machine works;
a packing seal structure; the packing sealing structure consists of a main shaft, a gland and packing, wherein the packing is of an annular structure, an annular groove which is matched with the packing structure is arranged on the end face of a main shaft collar, and the packing is arranged in the annular groove; a circular gland for compressing the filler is arranged above the filler;
a multi-labyrinth seal structure; the labyrinth sealing structure is formed by matching a movable ring and a static ring, and the movable ring is fixedly sleeved on the main shaft and rotates together with the main shaft.
Specifically, the inner part of the moving ring is positioned at the lower part of the spindle collar, the outer part of the moving ring is positioned at the lower part of the inner part of the stationary ring, and the outer part of the stationary ring is positioned at the outer side of the outer part of the moving ring; the inner side part of the gland is positioned at the upper part of the spindle collar, and the outer side part of the gland is positioned at the upper part of the stationary ring; the outer side part of the stationary ring is arranged on the frame through a plurality of second screws which are uniformly distributed along the circumferential direction of the stationary ring; the gland is arranged on the stationary ring through a plurality of first screws which are uniformly distributed along the circumferential direction of the gland; the pressing cover is provided with a plurality of pressing mechanisms which are uniformly distributed along the circumferential direction of the pressing cover and used for pressing and loosening and adjusting the pressing cover and the packing, the pressing mechanisms penetrate through the pressing cover and then are connected to the stationary ring, and the distance between the pressing mechanisms and the side edge of the pressing cover is longer than that between the first screw and the side edge of the pressing cover.
Preferably, the first screw is a set screw.
Preferably, the hold-down mechanism comprises: limit nut, gland nut, gasket, spring, T-shaped bolt; the head of the T-shaped bolt is fixedly arranged in the static ring, the screw part of the T-shaped bolt passes through the gland, the compression nut is screwed into the screw part of the T-shaped bolt, the limit nut is screwed into the screw part of the T-shaped bolt and is arranged at the upper part of the compression nut, and the gasket is sleeved on the screw part of the T-shaped bolt at the lower part of the compression nut; the spring is sleeved on the screw rod part of the T-shaped bolt and is arranged between the gasket and the gland; the limit sleeve is sleeved on the screw rod part of the T-shaped bolt.
Further, a plurality of circular arc grooves are uniformly distributed on the gland along the circumferential direction of the gland, and the screw rod part of one T-shaped bolt is correspondingly clamped into one circular arc groove; a plurality of T-shaped grooves are uniformly distributed on the stationary ring along the circumferential direction of the stationary ring, and the head of one T-shaped bolt is correspondingly clamped into one T-shaped groove.
Preferably, the filler is a hard graphite material, a soft graphite woven material or a polytetrafluoroethylene material.
Preferably, a plurality of static seals are provided on the stationary ring for preventing leakage of sealing medium from the rotor gap.
The invention has the beneficial effects that:
the invention relates to a main shaft dynamic sealing structure of a large high-speed geotechnical centrifuge, which comprises the following components:
1. the sealing device has strong adaptability, comprises a combination sealing mode of a plurality of labyrinth sealing structures, a spiral sealing structure and a packing sealing structure, is suitable for vacuum dynamic sealing, and can realize oil sealing under normal pressure.
2. The packing seal with the abrasion has long service life, can be opened according to the requirement through the structure of the first screw, the pressing mechanism and the gland combination, and is only used in a few times of vacuumizing the centrifuge chamber.
3. The vacuum dynamic seal has strong reliability, and the compressing mechanism with the spring is designed to ensure that the gland can still compress the filler after the filler is worn.
4. The pressing mechanism is easy to replace and switch, and the pressing mechanism is convenient to replace by arranging an arc groove and a T-shaped groove which correspond to the pressing mechanism on the pressing cover and the stationary ring respectively; the compressing mechanism is provided with the limiting sleeve, so that the compressing amount of each compressing mechanism spring is consistent, and the manual operation difficulty is reduced.
Drawings
FIG. 1 is a schematic view of the mounting structure of the present invention;
FIG. 2 is a schematic view of a partial cross-sectional structure of the present invention;
FIG. 3 is a schematic structural view of a packing seal, a spiral seal and a labyrinth seal according to the present invention;
FIG. 4 is a detail view of a partial structure of the present invention;
FIG. 5 is a schematic view of a compressing mechanism according to the present invention;
FIG. 6 is a schematic view of the structure of the moving ring of the present invention;
FIG. 7 is a schematic view of the structure of the gland of the present invention;
fig. 8 is a schematic structural view of a stationary ring in the present invention.
In the figure: 1. a packing seal structure; 11. a filler; 12. a gland; 121. an arc groove; 13. a compressing mechanism; 131. a limit nut; 132. a compression nut; 133. a gasket; 134. a spring; 135. a T-shaped bolt; 136. a limit sleeve; 14. a first screw; 2. a spiral seal structure; 21. a stationary ring; 22. a second screw; 3. a labyrinth seal structure; 31. a moving ring; 311. a ring groove; 312. multiple-head rectangular threads; 32. static sealing strips; 4. a main shaft.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
example 1, as shown in FIGS. 1, 2, 3, 4, 6, 7, 8,
large-scale high-speed geotechnique centrifuge main shaft 4 moves seal structure includes:
a spiral seal structure 2; the spiral sealing structure 2 consists of a main shaft 4 and a stationary ring 21, a gap is arranged between the main shaft 4 and the stationary ring 21, a multi-head rectangular thread 312 is arranged on the outer diameter side surface of a shaft collar of the main shaft 4, and the multi-head rectangular thread 312 is used for driving sealing medium downwards when the centrifugal machine works;
a packing seal structure 1; the packing sealing structure 1 consists of a main shaft 4, a gland 12 and packing 11, wherein the packing 11 is of an annular structure, an annular groove 311 which is matched with the packing 11 in structure is arranged on the end face of a collar of the main shaft 4, and the packing 11 is arranged in the annular groove 311; a circular gland 12 for compressing the packing 11 is arranged above the packing 11;
a multi-path labyrinth seal structure 3; the labyrinth seal structure 3 is composed of a movable ring 31 and a stationary ring 21 in a matched manner, and the movable ring 31 is fixedly sleeved on the main shaft 4 and rotates together with the main shaft 4.
The labyrinth seal structure 3 and the spiral seal structure 2 belong to non-contact sealing, have no abrasion during operation, have long service life, are suitable for normal pressure environment, and play a role in decompression in vacuum environment. While labyrinth seals and spiral seals have clearances, they do not completely prevent leakage of the sealing medium in a vacuum environment. The packing 11 seal belongs to contact seal, has good sealing effect, has friction during operation, and can ensure that the medium is free from leakage when the packing runs for a short time in a vacuum environment.
The filler 11 has a ring-shaped structure with a square cross section;
a proper gap is reserved between the main shaft 4 and the stationary ring 21, the screw rotation direction of the multi-head rectangular screw thread 312 is related to the rotation direction of a centrifugal machine (unidirectional rotation in operation), and when the centrifugal machine works, the screw thread can drive a sealing medium downwards so as to play a sealing effect;
the labyrinth seal is arranged between the movable ring 31 and the stationary ring 21, a plurality of labyrinth seals are arranged on the stationary ring 21 and the movable ring 31, in particular, a plurality of corresponding protrusions or grooves are arranged in the radial direction and the axial direction (the protrusions of the stationary ring 21 correspond to the grooves of the movable ring 31, or the protrusions of the stationary ring 21 correspond to the grooves of the movable ring 31; in the embodiment, the protrusions are arranged on the movable ring 31, the grooves are arranged on the stationary ring 21, the protrusions of the movable ring 31 and the grooves of the stationary ring 21 form a first labyrinth seal structure 3, the grooves are arranged on the movable ring 31, the protrusions are arranged on the stationary ring 21, and the grooves of the movable ring 31 and the protrusions of the stationary ring 21 form a second labyrinth seal structure 3).
Example 2, as shown in figure 4,
this embodiment differs from embodiment 1 in that: the inner part of the moving ring 31 is positioned at the lower part of the spindle 4 collar, the outer part of the moving ring 31 is positioned at the lower part of the inner part of the stationary ring 21, and the outer part of the stationary ring 21 is positioned at the outer side of the outer part of the moving ring 31; the inner part of the gland 12 is positioned at the upper part of the collar of the main shaft 4, and the outer part of the gland 12 is positioned at the upper part of the stationary ring 21; the outer part of the stationary ring 21 is mounted on the frame by a plurality of second screws 22 uniformly distributed along the circumferential direction thereof; the gland 12 is mounted on the stationary ring 21 by a plurality of first screws 14 uniformly distributed along the circumferential direction thereof; the gland 12 is provided with a plurality of compressing mechanisms 13 which are uniformly distributed along the circumferential direction and are used for compressing and loosening the gland 12 and the packing 11, the compressing mechanisms 13 penetrate through the gland 12 and are connected to the stationary ring 21, and the distance between the compressing mechanisms 13 and the side edge of the gland 12 is longer than that between the first screw 14 and the side edge of the gland 12.
Example 3, as shown in figure 4,
this embodiment differs from embodiment 2 in that: the first screw 14 is a set screw.
Example 4, as shown in figure 5,
this embodiment differs from embodiment 2 in that: the pressing mechanism 13 includes: a limit nut 131, a compression nut 132, a gasket 133, a spring 134 and a T-shaped bolt 135; the head of the T-shaped bolt 135 is fixedly arranged in the stationary ring 21, the screw part of the T-shaped bolt 135 passes through the gland 12, the compression nut 132 is screwed into the screw part of the T-shaped bolt 135, the limit nut 131 is screwed into the screw part of the T-shaped bolt 135 and is arranged at the upper part of the compression nut 132, and the gasket 133 is sleeved on the screw part of the T-shaped bolt 135 at the lower part of the compression nut 132; the spring 134 is sleeved on the screw part of the T-shaped bolt 135 and is arranged between the gasket 133 and the gland 12; the stop collar 136 fits over the shank portion of the T-bolt 135.
When the gland 12 is needed to compress, the compressing mechanism 13 is screwed down; when the gland 12 needs to be loosened, the pressing mechanism 13 is unscrewed, and the jacking screw is screwed.
Example 5, as shown in figures 5, 7 and 8,
this embodiment differs from embodiment 4 in that: a plurality of circular arc grooves 121 are uniformly distributed on the gland 12 along the circumferential direction, and the screw part of one T-shaped bolt 135 is correspondingly clamped into one circular arc groove 121; the stationary ring 21 is uniformly provided with a plurality of T-shaped grooves along the circumferential direction thereof, and the head of one T-shaped bolt 135 is correspondingly snapped into one T-shaped groove.
A spacer 133 is provided between the compression nut 132 and the spring 134 to increase the contact area. By rotating the compression nut 132, downward movement along the T-bolt 135 is achieved, compressing the spring 134 and thus the gland 12 via the spring 134. The provision of the spring 134 ensures that the gland 12 can still compress the packing 11 after the packing 11 has been worn. The lower end of the T-shaped bolt 135 is provided with the limit sleeve 136, so that the downward moving distance of the compression nut 132 is limited, and the compression nut 132 is only required to be manually rotated to the limit sleeve 136 during operation, so that the required compression force of the spring 134 is realized, and the consistency of the compression force of each compression mechanism 13 can be ensured. The length of the stop collar 136 may be set as desired and matched to the desired amount of compression of the spring 134. The limit nut 131 is disposed at the uppermost end of the T-bolt 135 to prevent the press nut 132 from being unscrewed when the press mechanism 13 is loosened. The design of the limit sleeve 136 and the limit nut 131 of the pressing mechanism 13 greatly reduces the operation difficulty of manually adjusting the pressing force, and the pressure of each pressing mechanism 13 in the circumferential direction of the pressing cover 12 can be easily adjusted to be consistent.
In example 6 the process was carried out,
this embodiment differs from embodiment 1 in that: the filler 11 is a hard graphite material, a soft graphite woven material or a polytetrafluoroethylene material.
The material of the packing 11 is different according to the line speed, the sealing medium pressure and the sealing size, and different packing 11 is selected.
Example 7, as shown in figure 4,
this embodiment differs from embodiment 1 in that: a plurality of static seals 32 are provided on the stationary ring 21 to prevent leakage of sealing medium from the rotor gap. The present embodiment is provided with two static seals 32, one of which is disposed between the gland 12 and the stationary ring 21 and the other of which is disposed between the frame and the stationary ring 21.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and their equivalents.
Claims (7)
1. Large-scale high-speed geotechnique centrifuge main shaft moves seal structure, its characterized in that includes:
a spiral seal structure; the spiral sealing structure consists of a main shaft and a stationary ring, a gap is arranged between the main shaft and the stationary ring, a multi-head rectangular thread is arranged on the outer diameter side surface of the main shaft collar, and the multi-head rectangular thread is used for driving a sealing medium downwards when the centrifugal machine works;
a packing seal structure; the packing sealing structure consists of a main shaft, a gland and packing, wherein the packing is of an annular structure, an annular groove which is matched with the packing structure is arranged on the end face of a main shaft collar, and the packing is arranged in the annular groove; a circular gland for compressing the filler is arranged above the filler;
a multi-labyrinth seal structure; the labyrinth sealing structure consists of a movable ring and a static ring in a matched mode, and the movable ring is fixedly sleeved on the main shaft and rotates together with the main shaft; in the radial direction, the movable ring is provided with a bulge, the static ring is provided with a groove, the movable ring bulge and the static ring groove form a first labyrinth seal structure, the movable ring is provided with a groove in the axial direction, the static ring is provided with a bulge, and the movable ring groove and the static ring bulge form a second labyrinth seal structure.
2. The large-scale high-speed geotechnical centrifuge main shaft dynamic sealing structure according to claim 1, wherein: the inner side part of the moving ring is positioned at the lower part of the spindle collar, the outer side part of the moving ring is positioned at the lower part of the inner side part of the static ring, and the outer side part of the static ring is positioned at the outer side of the outer side part of the moving ring; the inner side part of the gland is positioned at the upper part of the spindle collar, and the outer side part of the gland is positioned at the upper part of the stationary ring; the outer side part of the stationary ring is arranged on the frame through a plurality of second screws which are uniformly distributed along the circumferential direction of the stationary ring; the gland is arranged on the stationary ring through a plurality of first screws which are uniformly distributed along the circumferential direction of the gland; the pressing cover is provided with a plurality of pressing mechanisms which are uniformly distributed along the circumferential direction of the pressing cover and used for pressing and loosening and adjusting the pressing cover and the packing, the pressing mechanisms penetrate through the pressing cover and then are connected to the stationary ring, and the distance between the pressing mechanisms and the side edge of the pressing cover is longer than that between the first screw and the side edge of the pressing cover.
3. The large-scale high-speed geotechnical centrifuge main shaft dynamic sealing structure according to claim 2, wherein: the first screw is a set screw.
4. The dynamic spindle seal structure of a large high-speed geotechnical centrifuge according to claim 2, wherein the pressing mechanism comprises: limit nut, gland nut, gasket, spring, T-shaped bolt; the head of the T-shaped bolt is fixedly arranged in the static ring, the screw part of the T-shaped bolt passes through the gland, the compression nut is screwed into the screw part of the T-shaped bolt, the limit nut is screwed into the screw part of the T-shaped bolt and is arranged at the upper part of the compression nut, and the gasket is sleeved on the screw part of the T-shaped bolt at the lower part of the compression nut; the spring is sleeved on the screw rod part of the T-shaped bolt and is arranged between the gasket and the gland; the limit sleeve is sleeved on the screw rod part of the T-shaped bolt.
5. The dynamic spindle seal structure of a large high-speed geotechnical centrifuge according to claim 4, wherein: uniformly arranging a plurality of circular arc grooves along the circumferential direction of the gland, wherein the screw part of one T-shaped bolt is correspondingly clamped into one circular arc groove; a plurality of T-shaped grooves are uniformly distributed on the stationary ring along the circumferential direction of the stationary ring, and the head of one T-shaped bolt is correspondingly clamped into one T-shaped groove.
6. The large-scale high-speed geotechnical centrifuge main shaft dynamic sealing structure according to claim 1, wherein: the filler is a hard graphite material, a soft graphite woven material or a polytetrafluoroethylene material.
7. The large-scale high-speed geotechnical centrifuge main shaft dynamic sealing structure according to claim 1, wherein: a plurality of static sealing strips for preventing the gap of the rotating piece from leaking sealing medium are arranged on the static ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811384198.2A CN109261378B (en) | 2018-11-20 | 2018-11-20 | Main shaft dynamic sealing structure of large-scale high-speed geotechnical centrifuge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811384198.2A CN109261378B (en) | 2018-11-20 | 2018-11-20 | Main shaft dynamic sealing structure of large-scale high-speed geotechnical centrifuge |
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| CN109261378A CN109261378A (en) | 2019-01-25 |
| CN109261378B true CN109261378B (en) | 2023-12-22 |
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| CN110332312B (en) * | 2019-07-06 | 2021-07-23 | 南通范氏机械有限公司 | Axial combined sealing mechanism |
| CN111389601A (en) * | 2020-05-13 | 2020-07-10 | 中国工程物理研究院总体工程研究所 | Geotechnical centrifuge with small capacity and high G value |
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| CN203784305U (en) * | 2014-01-13 | 2014-08-20 | 济南钢城矿业有限公司 | Shaft end sealing structure of stirring shaft of disc type vacuum filter |
| WO2016000472A1 (en) * | 2014-07-02 | 2016-01-07 | 舍弗勒技术股份两合公司 | Labyrinth-type seal bearing |
| CN204459212U (en) * | 2015-01-23 | 2015-07-08 | 鞍山拜尔自控有限公司 | A kind of rotary seal valve integral seal auxiliary structure |
| WO2018037190A1 (en) * | 2016-08-25 | 2018-03-01 | Safran Aircraft Engines | Assembly forming a labyrinth seal for a turbomachine comprising an abradable material and inclined fins |
| CN206802310U (en) * | 2017-03-27 | 2017-12-26 | 青岛科技大学 | A kind of waste rubber cracking device end part of driving shaft sealing structure |
| CN107515134A (en) * | 2017-10-11 | 2017-12-26 | 哈尔滨工业大学 | The stagnant sealing structure of spiral grid type anti-sticking |
| CN209049564U (en) * | 2018-11-20 | 2019-07-02 | 中国工程物理研究院总体工程研究所 | Large high-speed geotechnical centrifuge main shaft movable sealing structure |
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