CN210034420U - Floating surface texture end cylindrical surface combination air film sealing structure - Google Patents
Floating surface texture end cylindrical surface combination air film sealing structure Download PDFInfo
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- CN210034420U CN210034420U CN201920451045.9U CN201920451045U CN210034420U CN 210034420 U CN210034420 U CN 210034420U CN 201920451045 U CN201920451045 U CN 201920451045U CN 210034420 U CN210034420 U CN 210034420U
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- 238000007667 floating Methods 0.000 title claims abstract description 64
- 238000007789 sealing Methods 0.000 title claims description 31
- 239000012530 fluid Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 239000010408 film Substances 0.000 description 22
- 238000005516 engineering process Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a floating surface texture end-post face combination gas film seal structure, including suit axle sleeve and end-post floating ring on the main shaft, end-post floating ring includes end plate and cylinder, and the end plate is connected to the front end of cylinder, and the front of end plate is provided with the axle sleeve, is provided with the passageway from front end to rear end on end plate and the cylinder, and the main shaft passes in the passageway, is provided with a plurality of surface texture grooves on the front of end plate and the inner wall of cylinder, and the front end of end-post floating ring is the low pressure side, and the rear end of end-post floating ring is the high pressure side, and gas gets into the sealed clearance that main shaft and cylinder inner wall formed from the high pressure side to pass through the sealed clearance that forms between end plate and the axle sleeve; the utility model discloses the surface texture groove of seting up at end, cylinder can realize the fluid dynamic pressure effect more reliably, reduces the fluid seal and lets out leakage quantity. Meanwhile, the special spring structure can ensure that the floating ring floats within a certain controllable range, and the collision between the end column floating ring and the shaft sleeve and between the end column floating ring and the main shaft when the rotor vibrates is prevented.
Description
Technical Field
The invention relates to the field of fluid sealing of dynamic and static interfaces of high-speed rotating parts of gas turbines (including ground gas turbines and aero-engines) and rocket engines, in particular to a floating type surface texture end cylindrical combined air film sealing structure.
Background
The gas turbine has the characteristics of small volume, high response speed, high efficiency, high power and the like, and is widely applied to the fields of aerospace, ships, power generation of power plants and other various industries at present. The rocket engine has the characteristic of high specific impulse, and is widely applied to the fields of spaceflight, missiles and the like. The technology for improving the sealing of high-speed rotating parts of the gas turbine and the rocket engine is one of key technologies for improving the performance of the gas turbine and the rocket engine. With the continuous increase of the demand of modern gas turbines and rocket engines and the continuous deterioration of working environments, the requirement for reducing leakage flow is higher and higher, and the demand for advanced sealing technology is stronger and stronger.
The air film sealing is used as a key technology of fluid sealing of a gas turbine and a rocket engine, and has the functions that when the shaft sleeve rotates at a high speed, air on a high-pressure side can be brought into the groove, the air is continuously compressed and generates air film pressure to form a dynamic pressure effect, and a thin film with small thickness and high rigidity is formed between the floating ring and the shaft sleeve, so that a main leakage channel is blocked; meanwhile, the shaft sleeve and the end column floating ring are eccentrically installed to form a convergent wedge-shaped space with different air film thicknesses, so that the dynamic pressure effect of sealing is further enhanced, and the air film bearing capacity is greatly improved. The two end faces which are originally contacted with each other in a moving and static way are separated by a fluid film formed by flowing of a fluid medium, so that the direct contact abrasion between the sealing end faces is avoided, and the sealed non-contact operation is realized. The air film sealing power loss is small, the auxiliary system is simple, the reliability is high, and the air film sealing device is very suitable for the high parameter requirements of gas turbines and rocket engines. The technology is applied to sealing at the high-speed rotating part of a turbopump of a domestic 'Sceber' aircraft engine and a certain type of rocket engine.
Disclosure of Invention
In order to further improve the sealing performance of the end-cylindrical surface combined air film seal, improve the air film rigidity, reduce the leakage rate and overcome the restriction of the existing end-cylindrical surface combined air film seal structure, the invention provides a floating surface texture end-cylindrical surface combined air film seal structure.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a floating surface texture end column face combination gas film seal structure, is including axle sleeve 2 and the end column floating ring 5 of suit on main shaft 3 in proper order, end column floating ring 5 includes end plate 10 and cylinder 9, end plate 10 is connected to the front end of cylinder 9, and the preceding axle sleeve 2 that is provided with of end plate 10, be provided with the passageway from front end to rear end on end plate 10 and the cylinder 9, main shaft 3 certainly pass in the passageway, be provided with a plurality of surface texture grooves 8 on the preceding of end plate 10 and the inner wall of cylinder 9, the front end of end column floating ring 5 is the low pressure side, and the rear end of end column floating ring 5 is the high pressure side, and gas gets into the seal clearance that main shaft 3 and cylinder 9 inner wall formed from the high pressure side to through the seal clearance that forms between end plate 10 and the axle sleeve 2.
Furthermore, a plurality of springs 4 are also arranged on the back of the end plate 10 and the outer wall of the column body 9, and the springs 4 are connected with the casing 1 covered outside the shaft sleeve 2 and the end column floating ring 5; the springs 4 between the end plate 10 and the casing 1 are arranged in 2 rows along the radial direction and are uniformly distributed along the circumferential direction, and the number of the springs 4 in each circumference is 4; the springs 4 between the cylinder 9 and the casing 1 are arranged in 3 rows along the axial direction and are uniformly distributed along the circumferential direction, and the number of the springs 4 in each circumference is 4.
Further, the tail end of cylinder 9 meets through a plurality of locating pin 6 and quick-witted casket 1, the tail end of cylinder 9 meets through rubber gasket 7 and quick-witted casket 1, rubber gasket 7 is a ring, and a plurality of locating pin 6 is located the ring outside, locating pin 6 is 4, along the circumference evenly distributed of 9 tail ends of cylinder.
Further, the cylinder 9 is a cylinder provided with a channel along a central axis thereof, the end plate 10 is a disc having a circular hole in the middle, the diameter of the channel is the same as that of the circular hole, the front end of the cylinder is connected with the disc, and the disc is perpendicular to the cylinder. The column 9 and the end plate 10 are integral.
Furthermore, the surface texture grooves 8 are circular grooves with the radius of 3-5 mm and the depth of 0.2-1 mm, and the size and the depth of each circular groove are the same.
Further, the surface texture grooves 8 formed in the end plates 10 are uniformly distributed in a plurality of circles along the circumferential direction thereof, and the surface texture grooves 8 formed in the inner walls of the columns 9 are uniformly distributed in a plurality of circles along the axial direction and the circumferential direction thereof.
Furthermore, the central axis of the surface texture groove 8 formed in the front of the end plate 10 is parallel to the central axis of the main shaft 3, a plurality of circles of surface texture grooves 8 are arranged concentrically and at equal intervals, the circle centers of the surface texture grooves are the circle centers of the end plate 10, the interval is 2 times of the radius of the surface texture groove 8, and the plurality of circles of surface texture grooves 8 are arranged in parallel or in a staggered manner; the central axis of the surface texture groove 8 arranged on the inner wall of the cylinder 9 is vertical to the central axis of the main shaft 3, a plurality of circles of surface texture grooves 8 are arranged concentrically at equal intervals, the circle centers of the surface texture grooves are all on the central axis of the cylinder 9, the intervals are 2 times of the radius of the surface texture grooves 8, and the plurality of circles of surface texture grooves 8 are arranged in parallel or in a staggered manner.
Further, the shaft sleeve 2 and the main shaft 3 are in interference fit and are concentrically mounted.
Furthermore, the end column floating ring 5 and the main shaft 3 are eccentrically installed, and the eccentricity ratio is 0.2-0.8.
Further, the outer diameter of the sleeve 2 is the same as that of the end plate 10.
Compared with the prior art, the invention has the following beneficial effects:
compared with the traditional end-cylindrical combined air film sealing structure, the end-cylindrical combined air film sealing structure has the advantages that the surface texture grooves formed in the end and the cylindrical surfaces can realize a more reliable fluid dynamic pressure effect, and the leakage rate of fluid sealing is reduced. Meanwhile, the special spring structure can ensure that the floating ring floats within a certain controllable range, and the collision between the end column floating ring and the shaft sleeve and between the end column floating ring and the main shaft when the rotor vibrates is prevented.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic representation of the face side of the present invention with the surface texture grooves in alignment;
FIG. 3 is a schematic representation of a surface textured groove fork row of the end face of the present invention;
FIG. 4 is a use assembly view of the present invention;
FIG. 5 is a cross-sectional view of the present invention;
FIG. 6 is a schematic view of the gas flow direction of the present invention;
wherein: 1-a casing, 2-a shaft sleeve, 3-a main shaft, 4-a spring, 5-an end column floating ring, 6-a positioning pin, 7-a rubber gasket, 8-a surface texture groove, 9-a column body and 10-an end plate.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1-6, a floating type surface texture end-column-surface combined gas film sealing structure comprises a shaft sleeve 2 and an end-column floating ring 5 which are sequentially sleeved on a main shaft 3, wherein the end-column floating ring 5 comprises an end plate 10 and a column body 9, the front end of the column body 9 is connected with the end plate 10, the shaft sleeve 2 is arranged in front of the end plate 10, passages from the front end to the rear end are arranged on the end plate 10 and the column body 9, the main shaft 3 penetrates through the passages, a plurality of surface texture grooves 8 are arranged on the front surface of the end plate 10 and the inner wall of the column body 9, the front end of the end-column floating ring 5 is a low-pressure side, the rear end of the end-column floating ring 5 is a high-pressure side, and gas enters a sealing gap formed by the main shaft 3 and the inner wall of the column body 9 from the high-pressure; specifically, the cylinder 9 is a cylinder provided with a channel along its central axis, the end plate 10 is a disk having a circular hole in the middle, the channel has the same diameter as the circular hole, the front end of the cylinder is connected with the disk, the disk and the cylinder are perpendicular to each other, and preferably, the cylinder 9 and the end plate 10 are integrated.
A plurality of springs 4 are also arranged on the back of the end plate 10 and the outer wall of the column body 9, and the springs 4 are connected with the casing 1 covered outside the shaft sleeve 2 and the end column floating ring 5; preferably, the springs 4 between the end plate 10 and the casing 1 are arranged in 2 rows along the radial direction and are uniformly distributed along the circumferential direction, and the number of the springs 4 per circumference is 4; the springs 4 between the cylinder 9 and the casing 1 are arranged in 3 rows along the axial direction and are uniformly distributed along the circumferential direction, and the number of the springs 4 in each circumference is 4.
As a preferred scheme, the tail end of the cylinder 9 is connected with the casing 1 through a plurality of positioning pins 6, the tail end of the cylinder 9 is connected with the casing 1 through a rubber gasket 7, the rubber gasket 7 is a ring, and the plurality of positioning pins 6 are located outside the ring, preferably, the number of the positioning pins 6 is 4, and the positioning pins are uniformly distributed along the circumferential direction of the tail end of the cylinder 9.
Preferably, the outer diameter of the shaft sleeve 2 is the same as that of the end plate 10, the shaft sleeve 2 and the main shaft 3 are in interference fit and are concentrically mounted, the shaft sleeve 2 and the main shaft 3 perform synchronous motion, the end column floating ring 5 and the main shaft 3 are eccentrically mounted, and the eccentricity ratio is 0.2-0.8; specifically, the shaft sleeve 2 is in interference fit with the main shaft 3, the tail end of the cylinder 9 is connected with the casing 1 through the rubber gasket 7, gas cannot pass through between the shaft sleeve 2 and the main shaft 3, gas cannot pass through between the casing 1 and the outer wall of the shaft sleeve 2, and gas can only enter a sealing gap formed between the main shaft 3 and the inner wall of the cylinder 9 from the high-pressure side and pass through a sealing gap formed between the end plate 10 and the shaft sleeve 2.
Preferably, the surface texture grooves 8 are circular grooves with the radius of 3-5 mm and the depth of 0.2-1 mm, and the size and the depth of each circular groove are the same.
Preferably, the surface texture grooves 8 formed in the end plates 10 are uniformly distributed in a plurality of circles along the circumferential direction, and the surface texture grooves 8 formed in the inner walls of the columns 9 are uniformly distributed in a plurality of circles along the axial direction and the circumferential direction.
Specifically, the central axis of the surface texture groove 8 formed in the front of the end plate 10 is parallel to the central axis of the spindle 3, a plurality of circles of surface texture grooves 8 are arranged concentrically and at equal intervals, the circle centers of the surface texture grooves are the circle centers of the end plate 10, the interval is 2 times of the radius of the surface texture groove 8, and the plurality of circles of surface texture grooves 8 are arranged in parallel or in a staggered manner; the central axis of the surface texture groove 8 arranged on the inner wall of the cylinder 9 is vertical to the central axis of the main shaft 3, a plurality of circles of surface texture grooves 8 are arranged concentrically at equal intervals, the circle centers of the surface texture grooves are all on the central axis of the cylinder 9, the intervals are 2 times of the radius of the surface texture grooves 8, and the plurality of circles of surface texture grooves 8 are arranged in parallel or in a staggered manner.
The principle of the invention is as follows: the main shaft and the shaft sleeve are in interference fit, so that the shaft sleeve and the rotating shaft synchronously move; the end column floating ring is arranged on the main shaft, the end face and the outer side of the cylindrical surface of the end column floating ring are connected with the spring, and the spring can determine the radial displacement of the floating ring, so that the floating ring is ensured to float within a certain controllable range, the collision between the floating ring and a casing and between the floating ring and a shaft sleeve can be prevented, and the service life of sealing is prolonged. The rear end of the end column floating ring is positioned and matched by a positioning pin of the casing, so that the circumferential rotation motion of the end column floating ring is limited, and the end column floating ring is kept in a relatively stable position in the circumferential direction. The end column floating ring can be abutted against the rubber gasket by means of spring force and sealing air pressure, and high-pressure end media are prevented from directly leaking to the low-pressure side of the shaft end through the gap, so that the risk of secondary leakage is reduced. The end column floating ring and the shaft sleeve form a narrow microscale gap, and surface texture micro-grooves are formed in the end surface and the cylindrical surface of the end column floating ring. When the shaft sleeve rotates at a high speed, gas on a high-pressure side is brought into the groove, the gas is continuously compressed and generates gas film pressure to form a dynamic pressure effect, and a thin film with smaller thickness and higher rigidity is formed between the end column floating ring and the shaft sleeve and between the end column floating ring and the main shaft, so that a main leakage channel is blocked; meanwhile, the end column floating ring and the main shaft are eccentrically installed to form a convergent wedge-shaped space with different air film thicknesses, so that the dynamic pressure effect of sealing is further enhanced, and the air film bearing capacity is greatly improved.
According to the invention, the end column air film sealing is taken as a basis, and the micron-sized pit structures are arranged in front of the end plate and on the inner wall of the column body 9, so that compared with the traditional groove type sealing mode, the bearing capacity of the sealing surface is improved, the mechanical sealing abrasion is reduced, and the service life and the reliability of the sealing surface are improved. Each surface texture groove can be regarded as a tiny hydrodynamic bearing, extra hydrodynamic pressure is generated in the relative movement process, a thin fluid lubricating film is formed between friction pairs, the two surfaces are changed from a contact state to a non-contact state, and the hydrodynamic bearing has important significance for reducing the friction and the abrasion of mechanical seal. On the other hand, the surface texture grooves can also play a role in storing abrasive dust and lubricating oil.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a floating surface texture end column face combination air film seal structure which characterized in that: the end column floating ring is characterized by comprising a shaft sleeve (2) and an end column floating ring (5) which are sequentially sleeved on a main shaft (3), wherein the end column floating ring (5) comprises an end plate (10) and a cylinder (9), the front end of the cylinder (9) is connected with the end plate (10), the shaft sleeve (2) is arranged in front of the end plate (10), a channel from the front end to the rear end is arranged on the end plate (10) and the cylinder (9), the main shaft (3) penetrates through the channel, a plurality of surface texture grooves (8) are arranged in front of the end plate (10) and on the inner wall of the cylinder (9), the front end of the end column floating ring (5) is a low-pressure side, the rear end of the end column floating ring (5) is a high-pressure side, and gas enters a sealing gap formed by the inner wall of the main shaft (3) and the cylinder (9) from the high-pressure side and passes through the sealing gap formed between the.
2. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: a plurality of springs (4) are also arranged on the back of the end plate (10) and the outer wall of the column body (9), and the springs (4) are connected with a casing (1) which covers the shaft sleeve (2) and the end column floating ring (5).
3. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the tail end of cylinder (9) meets through a plurality of locating pin (6) and machine casket (1), the tail end of cylinder (9) meets through rubber gasket (7) and machine casket (1), rubber gasket (7) are a ring, and a plurality of locating pin (6) are located the ring outside.
4. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the cylinder (9) is a cylinder provided with a channel along the central axis thereof, the end plate (10) is a disc with a round hole in the middle, the diameter of the channel is the same as that of the round hole, the front end of the cylinder is connected with the disc, and the disc is vertical to the cylinder.
5. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the surface texture groove (8) is a circular groove with the radius of 3-5 mm and the depth of 0.2-1 mm, and the size and the depth of each circular groove are the same.
6. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the surface texture groove (8) formed in the end plate (10) is uniformly distributed with a plurality of circles along the circumferential direction, and the surface texture groove (8) formed in the inner wall of the column body (9) is uniformly distributed with a plurality of circles along the axial direction and the circumferential direction.
7. The floating surface textured end cylindrical combination air film seal structure of claim 6, wherein: the central axis of the surface texture groove (8) formed in the front of the end plate (10) is parallel to the central axis of the main shaft (3), a plurality of circles of surface texture grooves (8) are arranged at equal intervals and concentrically, the circle centers of the surface texture grooves are the circle centers of the end plate (10), the intervals are 2 times of the radius of the surface texture grooves (8), and the plurality of circles of surface texture grooves (8) are arranged in parallel or in a staggered manner; the central axis of the surface texture groove (8) arranged on the inner wall of the cylinder (9) is vertical to the central axis of the main shaft (3), a plurality of circles of surface texture grooves (8) are arranged concentrically at equal intervals, the circle centers of the surface texture grooves are all on the central axis of the cylinder (9), the intervals are 2 times of the radius of the surface texture grooves (8), and the plurality of circles of surface texture grooves (8) are arranged in sequence or in a staggered manner.
8. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the shaft sleeve (2) and the main shaft (3) are in interference fit and are concentrically arranged.
9. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the end column floating ring (5) and the main shaft (3) are eccentrically installed, and the eccentricity ratio is 0.2-0.8.
10. The floating surface textured end cylindrical combination air film seal structure of claim 1, wherein: the outer diameter of the shaft sleeve (2) is the same as that of the end plate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920451045.9U CN210034420U (en) | 2019-04-04 | 2019-04-04 | Floating surface texture end cylindrical surface combination air film sealing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920451045.9U CN210034420U (en) | 2019-04-04 | 2019-04-04 | Floating surface texture end cylindrical surface combination air film sealing structure |
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| CN210034420U true CN210034420U (en) | 2020-02-07 |
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| CN201920451045.9U Active CN210034420U (en) | 2019-04-04 | 2019-04-04 | Floating surface texture end cylindrical surface combination air film sealing structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030386A (en) * | 2019-04-04 | 2019-07-19 | 南京航空航天大学 | A kind of floating type Surface Texture newel post face combination gas film sealing structure |
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2019
- 2019-04-04 CN CN201920451045.9U patent/CN210034420U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030386A (en) * | 2019-04-04 | 2019-07-19 | 南京航空航天大学 | A kind of floating type Surface Texture newel post face combination gas film sealing structure |
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