CN111350551A - Be used for flexible cylinder air film seal structure between birotor axle - Google Patents
Be used for flexible cylinder air film seal structure between birotor axle Download PDFInfo
- Publication number
- CN111350551A CN111350551A CN202010153845.XA CN202010153845A CN111350551A CN 111350551 A CN111350551 A CN 111350551A CN 202010153845 A CN202010153845 A CN 202010153845A CN 111350551 A CN111350551 A CN 111350551A
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- China
- Prior art keywords
- sealing
- rotor
- ring
- film
- support
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/22—Lubricating arrangements using working-fluid or other gaseous fluid as lubricant
Abstract
The invention discloses a flexible cylindrical surface air film sealing structure used between double rotor shafts, which realizes non-contact sealing design between the double rotor shafts by utilizing the gas dynamic pressure lubrication principle. The sealing floating ring can follow the whirling motion or radial eccentric jumping of the rotor by adopting a large flexible elastic supporting structure, so that the aim of realizing the floating of the sealing floating ring in the radial direction is fulfilled. The sealing support is in a thin-wall cylindrical structure, the sealing support is connected with the sealing sleeve by an elastic supporting sheet, and the sealing sleeve is matched with the sealing ring through annular grooves on two end faces and combined into a sealing floating ring; the sealing floating ring can realize micro floating in the radial direction, compensate the radial eccentricity or runout of the rotor, and simultaneously generate a dynamic pressure air film between the sealing ring and the inner layer rotor, and the sealing ring and the inner layer rotor do not generate contact friction during working; the non-contact design enables the sealing to meet the requirement of long service life, and the sealing performance improvement of the shaft-to-shaft sealing has potential application value.
Description
Technical Field
The invention relates to a sealing technology of an intermediate bearing of a double-rotor gas turbine, in particular to a flexible cylindrical gas film sealing structure between double rotor shafts.
Background
In a double-rotor aircraft engine or a gas turbine, a high-pressure rotor and a low-pressure rotor are connected through an intermediate bearing, and the seal for the intermediate bearing is shaft-to-shaft seal. Inter-shaft seals are difficult to handle due to their unique dimensional requirements and harsh operating conditions of high interfacial sliding velocity, high boundary pressure differential, and high ambient temperature. The rotor has large run-out in the radial direction and the axial direction, the rotor is used for the labyrinth seal between the shafts of the double rotors in the prior art, the radial run-out or the eccentric operation of the rotor generates abrasion to the labyrinth tooth tip to cause the performance of the labyrinth seal to be reduced, the leakage is increased, and the efficiency loss is serious. The problem of tooth tip abrasion of the rotor caused by radial runout cannot be compensated by the labyrinth seal, and no better countermeasure for the problem exists at present. Therefore, under the background, the flexible cylindrical air film sealing technology between the double rotor shafts is used, the problem that the radial runout or eccentric rotation of the rotor can cause collision and friction between the sealing element and the rotor can be effectively solved, and the problem that when the conventional labyrinth seal is used between the double rotor shafts, the leakage is increased after the tooth tips are worn is solved.
Disclosure of Invention
In order to avoid the defects in the prior art, the invention provides a flexible cylindrical gas film sealing structure between double rotor shafts.
The invention solves the technical problem by adopting the technical scheme that the sealing device comprises a sealing support, an elastic supporting sheet, a sealing sleeve, a sealing ring, a sealing film, a sealing floating ring, an inner rotor and an outer rotor, and is characterized in that the sealing support is of a thin-wall cylindrical structure, the sealing support is connected with the sealing sleeve by the elastic supporting sheet, the sealing sleeve is assembled and connected with the sealing ring through groove tables of circular ring surfaces at two ends, the sealing sleeve and the sealing ring form the sealing floating ring, the sealing floating ring can realize micro floating in the radial direction, compensate the radial eccentricity or jumping of the rotor, and simultaneously generate a dynamic pressure air film between the sealing ring and the inner rotor, and the sealing ring and the inner rotor do not generate contact friction when in work;
the elastic supporting pieces are rectangular flexible metal sheets, the number of the elastic supporting pieces is multiple, the elastic supporting pieces are uniformly distributed on the inner cylindrical surface of the sealing support along the circumferential direction, the elastic supporting pieces are fixedly connected with the sealing sleeve, the installation angle of the elastic supporting pieces is adjustable, and the width of each elastic supporting piece is smaller than the axial size of the sealing sleeve;
the sealing film is a flexible non-metal film with corrugation waves on the surface, the corrugation waves are used for generating small elastic deformation in the radial direction of the sealing film, the sealing film is adhered between the inner cylindrical surface of the sealing support and the outer cylindrical surface of the sealing sleeve, the sealing film can prevent fluid from axially leaking from a gap between the elastic supporting sheets, and the sealing film can also be arranged into multiple layers.
The sealing support, the elastic support sheet and the sealing sleeve are made of metal materials and are fixedly connected by riveting or welding.
The sealing ring is made of graphite or other non-metal materials, the sealing ring is fastened in the sealing sleeve, the sealing ring and the sealing sleeve are in interference fit through annular grooves in two end faces, and the inner diameter size of the end face of the sealing sleeve is larger than that of the end face of the sealing ring.
The center line of the sealing support is superposed with the center line of the outer layer rotor.
Advantageous effects
The invention provides a flexible cylindrical surface air film sealing structure between double rotor shafts, which makes full use of the gas dynamic pressure lubrication principle to realize non-contact sealing design between the double rotor shafts; the adoption of a large flexible elastic supporting structure can realize that the sealing floating ring can follow the whirling motion or radial eccentric runout of the rotor, thereby achieving the purpose that the sealing floating ring can realize floating in the radial direction. The non-contact design enables the seal to meet the requirement of long service life. The problem that the existing inter-service-shaft labyrinth seal cannot compensate the increased leakage of the rotor caused by the abrasion of the tooth tips due to radial runout is solved.
The flexible cylindrical gas film sealing structure between the double rotor shafts can improve the defect of labyrinth sealing between the double rotor shafts in the prior art, and has potential application value in improving the sealing performance of the shaft-to-shaft sealing.
The flexible cylindrical gas film seal of the invention is not limited to be used in a double-rotor mode, but also can be used in the field of gas seal of the traditional single-rotor turbo machinery.
Drawings
The flexible cylindrical air film sealing structure used between the shafts of the double rotors is further described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic view of the flexible cylindrical gas film sealing structure used between the shafts of the double rotors in the invention.
Fig. 2 is an exploded view of the dual-rotor inter-shaft flexible cylindrical gas film sealing structure of the present invention.
Fig. 3a is a schematic diagram of a sealing sleeve of the birotor inter-shaft flexible cylindrical gas film sealing structure.
Fig. 3b is a cross-sectional view taken along line a-a of fig. 3 a.
Fig. 4a is a schematic view of a sealing ring of the birotor inter-shaft flexible cylindrical gas film sealing structure.
Fig. 4B is a cross-sectional view taken along line B-B of fig. 4 a.
Fig. 5 is a connection assembly drawing of the sealing sleeve and the sealing ring.
Fig. 6a is a schematic view of a sealing film of the bi-rotor inter-axial flexible cylindrical gas film sealing structure of the present invention.
Fig. 6b is a cross-sectional view taken along line C-C of fig. 6 a.
Fig. 7 is an assembly view of a dual rotor inter-shaft flexible cylindrical air film sealing structure.
In the drawings
1. Sealing support 2, elastic support sheet 3, sealing sleeve 4, sealing ring 5, sealing film 6, sealing floating ring 7, inner rotor 8 and outer rotor
Detailed Description
The embodiment is a flexible cylindrical gas film sealing structure used between double rotor shafts.
Referring to fig. 1 to 7, the flexible cylindrical gas film sealing structure for a dual-rotor shaft in the present embodiment is composed of a sealing support 1, an elastic support sheet 2, a sealing sleeve 3, a sealing ring 4, a sealing film 5, a sealing floating ring 6, an inner-layer rotor 7, and an outer-layer rotor 8; the sealing support 1 is of a thin-wall cylindrical structure, and the sealing support 1 is connected with the sealing sleeve 3 through an elastic support sheet 2; the sealing sleeve 3 and the sealing ring 4 are assembled and connected through groove tables of circular ring surfaces at two ends. The sealing sleeve 3 and the sealing ring 4 are combined to form a sealing floating ring 6, the sealing floating ring 6 can realize small floating in the radial direction to compensate the radial eccentricity or runout of the rotor, meanwhile, a dynamic pressure air film can be generated between the sealing ring 4 and the inner layer rotor 7, and the sealing ring 4 and the inner layer rotor 7 do not generate contact friction during working. The sealing sleeve 3 and the sealing ring 4 are in interference fit through groove tables on two end faces. The elastic supporting pieces 2 are rectangular flexible metal sheets, the number of the elastic supporting pieces 2 is multiple, the elastic supporting pieces 2 are uniformly distributed on the inner cylindrical surface of the sealing support 1 along the circumferential direction, the elastic supporting pieces 2 are fixedly connected with the sealing sleeve 3, the installation angle of the elastic supporting pieces 2 can be adjusted, and the width of the elastic supporting pieces 2 is smaller than the axial size of the sealing sleeve 3. In the embodiment, 8 elastic support plates are provided, and the number of the elastic support plates 2 can be adjusted according to the situation in practical application. The installation angle of the elastic support sheet 2 can also be set according to specific situations. The number and mounting angle of the elastic support sheets 2 affect the stiffness of the flexible cylindrical seal.
In this embodiment, the sealing film 5 is a flexible non-metallic film with corrugation corrugations on the surface thereof, which are used to elastically deform the sealing film in a radial direction by a small amount. A sealing membrane 5 is adhered between the inner cylindrical surface of the seal holder 1 and the outer cylindrical surface of the gland, the sealing membrane 5 being capable of blocking axial leakage of fluid from the gap between the elastomeric support sheets 2. The sealing film 5 may also be provided in multiple layers. The sealing film 5 is connected with the sealing support 1 and the sealing sleeve 3 by gluing or other methods; the sealing film 5 can be arranged on one side or on both sides, and is adjusted according to the working pressure. The flexible corrugated layer of the sealing film 5 has the function that the sealing film can be elastically stretched and deformed in a small range in the radial direction, and can adapt to the radial floating of the sealing sleeve 3, so that the sealing film 5 is prevented from being torn and broken when the sealing sleeve 3 floats in the radial direction. When in manufacturing, whether the sealing film is made of high-temperature resistant materials or not is determined according to the working environment.
The sealing support 1, the elastic support sheet 2 and the sealing sleeve 3 are made of metal materials, and the sealing support 1, the elastic support sheet 2 and the sealing sleeve 3 are fixedly connected by adopting a riveting or welding process. The central line of the sealing support 1 is coincident with the central line of the outer layer rotor 8.
Carrying out the step
In this embodiment, the sealing support 1 is connected with the outer rotor 8 in an interference fit manner, the inner rotor 7 penetrates through the sealing ring 4, the diameter of the sealing ring 4 is larger than the outer diameter of the inner rotor 7, the outer diameter gap between the sealing ring 4 and the inner rotor 7 is several tens of micrometers, and gas leaks to the low-pressure side from the high-pressure side along the axial gap. In operation, the sealing structure rotates along with the outer rotor 8, namely the sealing floating ring 6 rotates along with the outer rotor 8. Since the center line of the sealing support 1 is always coincident with the center line of the outer-layer rotor, the center of the sealing support is considered to be the center of the outer-layer rotor. If no radial run-out or eccentric working condition exists, the center of the sealing support, the center of the sealing ring and the center of the inner layer rotor are superposed. During actual operation, the center of the inner rotor is not concentric with the center of the sealing support due to radial runout or eccentricity, so that an eccentricity is generated, at the moment, the eccentricity is transmitted between the sealing ring 4 and the inner rotor 7, a convergence gap similar to a sliding bearing is formed, and gas is driven by a solid wall surface to form gas dynamic pressure lubrication. Hydrodynamic pressure is formed on the inner circumferential cylindrical surface of the sealing ring 4, the sealing floating ring 6 overcomes the elastic action of the elastic support on the sealing ring under the pushing of the hydrodynamic pressure, and the sealing floating ring 6 also generates eccentricity relative to the sealing support 1. The problem of radial runout or eccentricity of the compensated rotor is solved, and the inner layer rotor and the sealing ring do not generate contact friction under the action of hydrodynamic pressure.
No matter one of the inner layer rotor 7 and the outer layer rotor 8 or both the inner layer rotor and the outer layer rotor generate whirling motion or eccentricity, the flexible design can accommodate the radial runout of the two inner layer rotors 7 and the outer layer rotor 8, so that the sealed floating ring and the inner layer rotor are ensured not to generate contact friction, and the requirement of long service life is met. When the rotating speed of the outer rotor 8 is zero, namely the rotating speed is degraded to the traditional single-rotor dynamic seal, the flexible cylindrical surface seal of the embodiment also completely meets the requirement of the single-rotor dynamic seal.
Claims (4)
1. A flexible cylindrical surface air film sealing structure used between shafts of a double-rotor comprises a sealing support, an elastic supporting sheet, a sealing sleeve, a sealing ring, a sealing film, a sealing floating ring, an inner rotor and an outer rotor, and is characterized in that the sealing support is of a thin-wall cylindrical structure, the sealing support is connected with the sealing sleeve through the elastic supporting sheet, the sealing sleeve is assembled and connected with the sealing ring through groove tables of circular ring surfaces at two ends, the sealing sleeve and the sealing ring form the sealing floating ring, the sealing floating ring can realize micro floating in the radial direction, compensate the radial eccentricity or jumping of the rotor, and simultaneously generate a dynamic pressure air film between the sealing ring and the inner rotor, and the sealing ring and the inner rotor do not generate contact friction when in work;
the elastic supporting pieces are rectangular flexible metal sheets, the number of the elastic supporting pieces is multiple, the elastic supporting pieces are uniformly distributed on the inner cylindrical surface of the sealing support along the circumferential direction, the elastic supporting pieces are fixedly connected with the sealing sleeve, the installation angle of the elastic supporting pieces is adjustable, and the width of each elastic supporting piece is smaller than the axial size of the sealing sleeve;
the sealing film is a flexible non-metal film with corrugation waves on the surface, the corrugation waves are used for generating small elastic deformation in the radial direction of the sealing film, the sealing film is adhered between the inner cylindrical surface of the sealing support and the outer cylindrical surface of the sealing sleeve, the sealing film can prevent fluid from axially leaking from a gap between the elastic supporting sheets, and the sealing film can also be arranged into multiple layers.
2. The dual-rotor inter-shaft flexible cylindrical gas film sealing structure as claimed in claim 1, wherein the sealing support, the elastic support sheet and the sealing sleeve are made of metal, and the sealing support, the elastic support sheet and the sealing sleeve are fixedly connected by riveting or welding.
3. The dual-rotor inter-shaft flexible cylindrical surface air film sealing structure as claimed in claim 1, wherein the sealing ring is made of graphite or other non-metallic materials, the sealing ring is fastened in the sealing sleeve, the sealing ring and the sealing sleeve are in interference fit through annular grooves in two end faces, and the inner diameter of the end face of the sealing sleeve is larger than that of the end face of the sealing ring.
4. The flexible cylindrical gas film sealing structure used between the shafts of the double rotors as claimed in claim 1, wherein the center line of the sealing support coincides with the center line of the rotor on the outer layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010153845.XA CN111350551B (en) | 2020-03-07 | 2020-03-07 | Be used for flexible cylinder air film seal structure between birotor axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010153845.XA CN111350551B (en) | 2020-03-07 | 2020-03-07 | Be used for flexible cylinder air film seal structure between birotor axle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111350551A true CN111350551A (en) | 2020-06-30 |
| CN111350551B CN111350551B (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010153845.XA Active CN111350551B (en) | 2020-03-07 | 2020-03-07 | Be used for flexible cylinder air film seal structure between birotor axle |
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| CN109139927A (en) * | 2018-10-31 | 2019-01-04 | 中国计量大学 | A kind of peripheral flow causes the paillon gas film face seal structure of openability enhancing |
| CN211875109U (en) * | 2020-01-20 | 2020-11-06 | 陕西工业职业技术学院 | Nested biax sealing device between axle |
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| CN111350551B (en) | 2022-04-26 |
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