CN112648027A - Positioning structure for improving critical rotating speed of turbine rotor - Google Patents
Positioning structure for improving critical rotating speed of turbine rotor Download PDFInfo
- Publication number
- CN112648027A CN112648027A CN202011449386.6A CN202011449386A CN112648027A CN 112648027 A CN112648027 A CN 112648027A CN 202011449386 A CN202011449386 A CN 202011449386A CN 112648027 A CN112648027 A CN 112648027A
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- China
- Prior art keywords
- impeller
- shaft
- sleeve
- positioning structure
- positioning
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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
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
Abstract
The invention discloses a positioning structure for improving the critical rotating speed of a turbine rotor, which is applied to a turbine pump rotor, wherein the positioning structure comprises: the device comprises an impeller (1), a shaft (2), a first sleeve (3), a bearing (4), a second sleeve (5) and a compression nut (6); a support lug is arranged at the first end of the shaft (2), and the hub of the impeller axially comprises a section of cylindrical hub; the impeller (1), the first sleeve (3), the bearing (4), the second sleeve (5) and the compression nut (6) are sequentially arranged on the shaft (2), and pre-tightening force is applied to the compression nut (6) to compress and fix the impeller; the impeller (1) the cylindrical hub is inserted into a support lug of the shaft (2), and the support lug and an inserting structure formed by the cylindrical hub play a role in limiting and positioning when rotating. The positioning structure disclosed by the invention can limit the radial displacement of the impeller hub under high rotating speed, improve the integral rigidity of the rotor and improve the critical rotating speed of the rotor.
Description
Technical Field
The invention belongs to the technical field of aerospace, and particularly relates to a positioning structure for improving the critical rotating speed of a turbine rotor.
Background
The turbopump is widely applied to the fields of aviation, aerospace, near space combined engines and the like, and has important significance for developing high-performance and high-thrust engines by utilizing the critical rotating speed of the turbopump in the existing design and process level under the conditions of high-thrust design indexes of the engines and high-performance requirements of the engines. The axial parts such as the impeller, the bearing and the like are assembled with the shaft, and a series of parts on the shaft are compressed by applying a certain pretightening force to a compression nut at the shaft end. In the working state, when the stress of the part on the rotor exceeds the pretightening force, the compacted surfaces of the part can be separated, the rigidity of the whole rotor is reduced, and the critical rotating speed is reduced. It can be seen that there is a strong need for those skilled in the art to provide a solution for increasing the critical speed of a turbopump rotor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the contact surface is separated due to insufficient preload force of the parts on the shaft at high rotating speed, the rigidity of the rotor is reduced, and the critical rotating speed is reduced.
In order to solve the technical problem, the invention discloses a positioning structure for improving the critical rotating speed of a turbine rotor, which is applied to a turbine pump rotor, wherein the positioning structure comprises: the device comprises an impeller, a shaft, a first sleeve, a bearing, a second sleeve and a compression nut;
a support lug is arranged at the first end of the shaft, and the hub of the impeller axially comprises a section of cylindrical hub;
the impeller, the first sleeve, the bearing, the second sleeve and the compression nut are sequentially arranged on the shaft and are fixedly pressed by applying a pre-tightening force through the compression nut; the cylindrical hub of the impeller is inserted into a support lug of the shaft, and an inserting structure formed by the support lug and the cylindrical hub plays a role in limiting and positioning when rotating.
Preferably, the journal stirrup of the shaft and the cylindrical hub of the impeller have a main positioning surface and an auxiliary positioning surface, and a second fit clearance of the auxiliary positioning surface is greater than or equal to a first fit clearance of the main positioning surface.
Preferably, the first fit clearance is determined according to the deformation of the impeller under a specific working condition, and the first fit clearance is smaller than the deformation of the impeller.
Preferably, the axial length of the cylindrical hub protruding from the impeller hub is greater than or equal to the axial length of the support lug auxiliary positioning surface.
Preferably, the auxiliary positioning surface on the shaft limits radial deformation of the impeller during operation, and ensures that the main positioning surface is tightly attached to the impeller during operation.
Preferably, a first preset part may be provided in the first sleeve.
Preferably, a second preset part may be provided in the second sleeve.
According to the positioning structure for improving the critical rotating speed of the turbine rotor, on the one hand, the radial displacement of the impeller hub under high rotating speed can be limited, the integral rigidity of the rotor is improved, and the critical rotating speed of the rotor is improved; in the second aspect, the necessary pretightening force of the shaft end compression nut can be reduced, the operation difficulty of assembly is reduced, and the deformation of the shaft, the shaft and other parts caused by the excessive pretightening force is avoided; and in the third aspect, the structure is simple and the operability is strong.
Drawings
Fig. 1 is a schematic view of a positioning structure for increasing the critical rotation speed of a turbine rotor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and with reference to the attached drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The positioning structure for improving the critical rotating speed of the turbine rotor in the embodiment of the invention is applied to the turbine pump rotor, and as shown in fig. 1, the positioning structure in the embodiment of the invention comprises: the device comprises an impeller 1, a shaft 2, a first sleeve 3, a bearing 4, a second sleeve 5 and a compression nut 6; A. b, C are the three faces of the impeller hub that mate with the lugs. The first sleeve 3 and the second sleeve 5 represent other components on the shaft.
A support lug is arranged at the first end of the shaft 2, and the hub of the impeller axially comprises a section of cylindrical hub;
the impeller 1, the first sleeve 3, the bearing 4, the second sleeve 5 and the compression nut 6 are sequentially arranged on the shaft 2 and are fixedly compressed by applying a pre-tightening force through the compression nut 6; the cylindrical hub of the impeller 1 is inserted into the support lug of the shaft 2, and the insertion structure formed by the support lug and the cylindrical hub plays a role in limiting and positioning when rotating.
The shaft with the support lug is matched with the impeller hub, and the invention is a new scheme for improving the critical rotating speed of the turbine pump rotor. As shown in fig. 1, the parts on the shaft are mounted on the shaft in the assembly sequence and the shaft end is pressed against a series of parts on the shaft with a compression nut 6. In the working process, the disk acting part in the parts on the shaft usually acts on a larger load, so that the rotor generates larger deflection at the position, the separation of the matching end faces is easy to occur, the impeller 1 is far away from the compression nut 6, the pretightening force of the compression nut 6 is gradually attenuated through each part, and the effect of compression cannot be achieved when the pretightening force is transmitted to the impeller 1. The hub of the impeller 1 is inserted into the support lug of the shaft 2, and the support lug can limit the radial displacement of the impeller caused by the deflection of the rotor at high rotating speed, so that the impeller 1 and the shaft 2 are prevented from being separated from a matching surface B, the integral rigidity of the rotor is reduced, and the critical rotating speed is reduced.
In an alternative embodiment, the main positioning surface, i.e. the surface C, and the auxiliary positioning surface, i.e. the surface a, exist between the support lug of the shaft 2 and the cylindrical hub of the impeller 1, and the second fit clearance of the auxiliary positioning surface is greater than or equal to the first fit clearance of the main positioning surface. The main positioning surface and the auxiliary positioning surface both refer to two surfaces, and the matched part matching surfaces are positioning surfaces.
The first fit clearance can be determined according to the deformation of the impeller 1 under a specific working condition, and the first fit clearance is smaller than the deformation of the impeller 1.
The second fit clearance can not play a positioning role when being too large, the pretightening force of the compression nut can be reduced by reasonably selecting the second fit clearance, the assembling difficulty is reduced, the integral rigidity of the rotor is improved, and the critical rotating speed of the rotor is improved.
In an alternative embodiment, the axial length of the cylindrical hub from which the hub of the impeller 1 protrudes is greater than or equal to the axial length of the secondary locating surface of the support lug. The structure can ensure that the matching surface B of the impeller 1 and the shaft 2 is tightly attached during assembly.
In an alternative embodiment, the secondary locating surface a on the shaft 2 limits radial deformation of the impeller 1 during operation, ensuring that the primary locating surface C abuts the impeller 1 during operation. The integral rigidity of the rotor is maintained, and the critical rotating speed is obviously improved compared with that without the support lug.
In an alternative embodiment, a first preset feature may be provided in the first sleeve 3.
In an alternative embodiment, a second preset feature may be provided in the second sleeve 5.
The first preset component and the second preset component may be set by those skilled in the art according to actual needs, and are not particularly limited in the embodiments of the present invention.
In the embodiment of the invention, in order to improve the critical rotating speed of the rotor of the turbine pump, a radial limiting structure is added on the rotor at a position with larger stress, such as the impeller, namely, the radial deformation of the impeller relative to the shaft is limited by adding the support lug on the shaft, so that the separation of the joint end face of the impeller and the shaft caused by the upwarp of the rear hub surface of the impeller can be prevented, and the aim of improving the rigidity and the critical rotating speed of the rotor is fulfilled. The critical rotating speed of the turbine pump rotor can be improved without changing a large number of design schemes, the scheme is changed little, and the operability is strong.
According to the positioning structure for improving the critical rotating speed of the turbine rotor, on the one hand, the radial displacement of the impeller hub under high rotating speed can be limited, the integral rigidity of the rotor is improved, and the critical rotating speed of the rotor is improved; in the second aspect, the necessary pretightening force of the shaft end compression nut can be reduced, the operation difficulty of assembly is reduced, and the deformation of the shaft, the shaft and other parts caused by the excessive pretightening force is avoided; and in the third aspect, the structure is simple and the operability is strong.
It should be noted that the above description is only a preferred embodiment of the present invention, and it should be understood that various changes and modifications can be made by those skilled in the art without departing from the technical idea of the present invention, and these changes and modifications are included in the protection scope of the present invention.
The embodiments in the present description are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (7)
1. A positioning structure for increasing the critical speed of a turbine rotor, said positioning structure being applied to a turbine pump rotor, said positioning structure comprising: the device comprises an impeller (1), a shaft (2), a first sleeve (3), a bearing (4), a second sleeve (5) and a compression nut (6);
a support lug is arranged at the first end of the shaft (2), and the hub of the impeller axially comprises a section of cylindrical hub;
the impeller (1), the first sleeve (3), the bearing (4), the second sleeve (5) and the compression nut (6) are sequentially arranged on the shaft (2), and pre-tightening force is applied to the compression nut (6) to compress and fix the impeller; the impeller (1) the cylindrical hub is inserted into a support lug of the shaft (2), and the support lug and an inserting structure formed by the cylindrical hub play a role in limiting and positioning when rotating.
2. The positioning structure according to claim 1, wherein: the cylindrical hub of the journal stirrup and the impeller (1) of the shaft (2) is provided with a main positioning surface (C) and an auxiliary positioning surface (A), and the second fit clearance of the auxiliary positioning surface (A) is more than or equal to the first fit clearance of the main positioning surface (C).
3. The positioning structure according to claim 2, wherein: the first fit clearance is determined according to the deformation of the impeller (1) under a specific working condition, and the first fit clearance is smaller than the deformation of the impeller (1).
4. The positioning structure according to claim 1, wherein: the axial length of the cylindrical hub protruding from the hub of the impeller (1) is greater than or equal to the axial length of the auxiliary locating surface of the support lug.
5. The positioning structure according to claims 1 to 4, wherein: when the impeller works, the auxiliary positioning surface (A) on the shaft (2) limits the radial deformation of the impeller (1), and the main positioning surface (C) is ensured to be tightly attached to the impeller (1) when the impeller works.
6. The positioning structure according to claim 1, wherein: a first pre-set element may be arranged in the first sleeve (3).
7. The positioning structure according to claim 1, wherein: a second preset component can be arranged in the second sleeve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011449386.6A CN112648027A (en) | 2020-12-09 | 2020-12-09 | Positioning structure for improving critical rotating speed of turbine rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011449386.6A CN112648027A (en) | 2020-12-09 | 2020-12-09 | Positioning structure for improving critical rotating speed of turbine rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112648027A true CN112648027A (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011449386.6A Pending CN112648027A (en) | 2020-12-09 | 2020-12-09 | Positioning structure for improving critical rotating speed of turbine rotor |
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| CN (1) | CN112648027A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017072058A (en) * | 2015-10-07 | 2017-04-13 | 株式会社豊田自動織機 | Supercharger |
| CN110439847A (en) * | 2019-08-30 | 2019-11-12 | 广州市昊志机电股份有限公司 | Centrifugal compressor shafting structure and centrifugal compressor |
| CN111828372A (en) * | 2020-06-23 | 2020-10-27 | 北京航天动力研究所 | Flexible rotor of ultrahigh-rotating-speed liquid hydrogen turbopump |
| CN111911538A (en) * | 2020-06-16 | 2020-11-10 | 西安航天动力研究所 | Bearing seat structure with cooling inner flow channel for turbo pump |
-
2020
- 2020-12-09 CN CN202011449386.6A patent/CN112648027A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017072058A (en) * | 2015-10-07 | 2017-04-13 | 株式会社豊田自動織機 | Supercharger |
| CN110439847A (en) * | 2019-08-30 | 2019-11-12 | 广州市昊志机电股份有限公司 | Centrifugal compressor shafting structure and centrifugal compressor |
| CN111911538A (en) * | 2020-06-16 | 2020-11-10 | 西安航天动力研究所 | Bearing seat structure with cooling inner flow channel for turbo pump |
| CN111828372A (en) * | 2020-06-23 | 2020-10-27 | 北京航天动力研究所 | Flexible rotor of ultrahigh-rotating-speed liquid hydrogen turbopump |
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