CN213235136U - Connecting device for a main shaft and a hub of a turbine rotor - Google Patents
Connecting device for a main shaft and a hub of a turbine rotor Download PDFInfo
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- CN213235136U CN213235136U CN202021632361.5U CN202021632361U CN213235136U CN 213235136 U CN213235136 U CN 213235136U CN 202021632361 U CN202021632361 U CN 202021632361U CN 213235136 U CN213235136 U CN 213235136U
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Abstract
The utility model discloses a connecting device for a turbine rotor spindle and a hub, which comprises a pin bush (3), a bolt (4), a nut (5) and a flange (6); the flange is assembled on the main shaft (1), a plurality of connecting through holes (61) are formed in the flange, a plurality of connecting blind holes (21) are formed in the wheel hub (2), the connecting through holes and the connecting blind holes are countersunk holes with large apertures at one end and small apertures at the other end and are in one-to-one correspondence, and the large head ends of the connecting through holes are coaxially butted with the large head ends of the connecting blind holes; the pin bush is embedded in the big end of the connecting through hole and the connecting blind hole, one end of the bolt coaxially penetrates through the pin bush and is screwed in the small end of the connecting blind hole, the other end of the bolt penetrates through the flange through the connecting through hole and is screwed with the nut, the end face of the flange is attached and locked with the end face of the hub, and the main shaft is assembled and fixed with the hub. The utility model discloses a reliable assembly of turbine rotor main shaft and wheel hub is realized to the guide pin, can transmit high-power moment of torsion through the shearing force that produces between guide pin and wheel hub and the main shaft.
Description
Technical Field
The utility model relates to an assembly part for the turbine rotor especially relates to a connecting device for turbine rotor main shaft and wheel hub.
Background
The main shaft and the hub are main parts in the turbine rotor, axial and radial fixing and torque transmission reliability must be ensured when the main shaft and the hub are connected, and the firmness of the main shaft and the hub is related to the operation safety of the turbine rotor and influences the disassembly convenience when the turbine rotor is overhauled. At present, the following methods are commonly used for connecting a main shaft and a hub in a turbine rotor in the prior art:
(1) key connection
The key is a standard component used to achieve circumferential fixation between the main shaft and the hub to transmit torque. The key is divided into a flat key and a spline, the flat key connection has the defect that larger torque cannot be transmitted, the spline can transmit larger torque, but the processing requirement is extremely high, and if the processing has slight deviation from the theoretical size, the assembly can be greatly improved or even cannot be assembled.
(2) Interference connection
The main shaft and the hub are designed according to interference fit, and the transmission of torque is mainly realized by friction generated by the contact surface of the main shaft and the hub. The disadvantage of an interference connection is that it is difficult to install and is not suitable for multiple detachments.
(3) Reamed hole bolted connection
A large number of hinged hole bolts are used for connecting the main shaft and the hub and transmitting torque, and the connecting mode has the characteristics of large transmission torque and convenience in installation. The hinged hole bolt connection has the defects that the 'galling' phenomenon of the inner wall of the hinged hole is easily caused in the disassembly process, and the hinged hole needs to be drilled again when the hinged hole bolt connection is installed again, and the like.
Disclosure of Invention
An object of the utility model is to provide a connecting device for turbine rotor main shaft and wheel hub realizes turbine rotor main shaft and wheel hub's reliable assembly through the pin bush, can transmit high-power moment of torsion through the shearing force that produces between pin bush and wheel hub and the main shaft.
The utility model discloses a realize like this:
a connecting device for a main shaft and a hub of a turbine rotor comprises a pin sleeve, a bolt, a nut and a flange; the flange is coaxially assembled on a main shaft of the turbine rotor, a plurality of connecting through holes are arranged on the flange at intervals, and each connecting through hole is a counter bore with a large aperture at one end and a small aperture at the other end; a plurality of connecting blind holes are arranged on a hub of the turbine rotor at intervals, and each connecting blind hole is a counter bore with a large aperture at one end and a small aperture at the other end; when the main shaft is connected with the hub, the plurality of connecting through holes are respectively in one-to-one correspondence with the plurality of connecting blind holes, and the large head ends of the connecting through holes are coaxially butted with the large head ends of the connecting blind holes; the two ends of the pin bush are correspondingly embedded in the big head end of the connecting through hole and the big head end of the connecting blind hole, one end of the bolt coaxially penetrates through the pin bush and is screwed in the small head end of the connecting blind hole in a matching mode through threads, the other end of the bolt penetrates through the flange through the connecting through hole and is screwed in a matching mode with the nut, the end face of the flange is attached and locked with the end face of the hub, and therefore the main shaft and the hub are assembled and fixed.
The outer diameter of the pin bush is smaller than the inner diameter of the large head end of the connecting through hole and the inner diameter of the large head end of the connecting blind hole, and the length of the pin bush is smaller than the total length of the large head end of the connecting through hole and the large head end of the connecting blind hole, so that the pin bush can be assembled with the large head end of the connecting through hole and the large head end of the connecting blind hole in a small clearance mode.
The assembly clearance between the pin bush and the large head end of the connecting through hole and the large head end of the connecting blind hole is 0.02-0.05 mm.
The inner diameter of the pin bush is larger than the outer diameter of the bolt, so that the pin bush can be assembled with the bolt in a small clearance.
And chamfers are arranged at the edges of the two ends of the pin sleeve.
The plurality of connecting through holes are uniformly arranged along the circumferential direction of the flange.
The plurality of connecting blind holes are uniformly arranged along the circumferential direction of the hub.
The bolt is a high-strength hydraulic tension bolt.
The nut is a high-strength hydraulic nut.
Compared with the prior art, the utility model, following beneficial effect has:
1. the utility model discloses owing to be equipped with the guide pin of the circumference equipartition along flange and wheel hub, the guide pin passes through the counter sink and fixes between main shaft and wheel hub, is favorable to the reliable assembly of main shaft and wheel hub, and positioning accuracy is higher during the assembly, ensures that all guide pins and bolt can pack into wheel hub and main shaft simultaneously, and easy dismounting.
2. The utility model discloses owing to be equipped with the guide along flange and wheel hub's circumference equipartition, can be greater than the shearing force transmission moment of torsion that produces between guide of bolt and wheel hub and the main shaft through the diameter, ensure the transmission reliability of high-power moment of torsion.
The utility model discloses a counter sink installs the pin bushing additional and realizes the assembly of turbine rotor main shaft and wheel hub to utilize the shearing force that produces between pin bushing and wheel hub and the main shaft to transmit the moment of torsion, have advantages such as connection reliability height, easy dismounting, transmission torque power are big.
Drawings
FIG. 1 is a cross-sectional view of a coupling device for a turbine rotor main shaft and a hub according to the present invention;
FIG. 2 is a perspective view of a flange of the coupling device for a turbine rotor spindle and a hub according to the present invention;
FIG. 3 is a perspective view of a hub of the present invention for use in a coupling device for a turbine rotor spindle and hub;
FIG. 4 is a perspective view of a pin bushing of the present invention for use in a coupling device for a turbine rotor spindle and a wheel hub;
FIG. 5 is a cross-sectional view of a pin sleeve of the coupling device for a turbine rotor spindle and hub of the present invention;
FIG. 6 is a perspective view of a bolt of the present invention used in a coupling device for a turbine rotor spindle and a hub;
figure 7 is a perspective view of a nut of the coupling device for a turbine rotor spindle and a hub according to the present invention.
In the figure, a main shaft 1, a hub 2, a connecting blind hole 21, a pin bush 3, a chamfer 31, a bolt 4, a nut 5, a flange 6 and a connecting through hole 61 are arranged.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Referring to fig. 1, a connecting device for a main shaft and a hub of a turbine rotor comprises a pin sleeve 3, a bolt 4, a nut 5 and a flange 6; referring to fig. 2, a flange 6 is coaxially assembled on a main shaft 1 of a turbine rotor, a plurality of connecting through holes 61 are arranged on the flange 6 at intervals, and each connecting through hole 61 is a countersunk hole with a large aperture at one end and a small aperture at the other end; referring to fig. 3, a hub 2 of a turbine rotor is provided with a plurality of connecting blind holes 21 at intervals, and each connecting blind hole 21 is a countersunk hole with a large aperture at one end and a small aperture at the other end; when the main shaft 1 is connected with the hub 2, the connecting through holes 61 are respectively in one-to-one correspondence with the connecting blind holes 21, and the large head ends of the connecting through holes 61 are coaxially butted with the large head ends of the connecting blind holes 21; the both ends of pin bushing 3 correspond to inlay the dress in the big head end of connect through-hole 61 and the big head end of connecting blind hole 21, the one end of bolt 4 is coaxial to run through pin bushing 3 and to connect soon in the little head end of connecting blind hole 21 through the screw thread matching, the other end of bolt 4 runs through flange 6 and connects soon with the nut 5 matching through connect through-hole 61, make the terminal surface of flange 6 and the terminal surface laminating locking of wheel hub 2, thereby make main shaft 1 and wheel hub 2 assembly fixed, turbine rotor mainly passes through the shearing force that produces between 3 and wheel hub 2 and the main shaft 1 of the pin bushing of the major diameter than bolt 4 and transmits the moment of torsion.
The outer diameter of the pin bush 3 is slightly smaller than the inner diameter of the big end of the connecting through hole 61 and the inner diameter of the big end of the connecting blind hole 21, the length of the pin bush 3 is slightly smaller than the total length of the big end of the connecting through hole 61 and the big end of the connecting blind hole 21, so that the pin bush 3 can be assembled with the big end of the connecting through hole 61 and the big end of the connecting blind hole 21 in a small clearance manner, and the stability of assembly and the reliability of torque transmission are ensured.
Preferably, the assembly clearance between the pin bush 3 and the large end of the connecting through hole 61 and the large end of the connecting blind hole 21 is 0.02-0.05 mm.
The inner diameter of the pin bush 3 is slightly larger than the outer diameter of the bolt 4, so that the pin bush 3 and the bolt 4 can be assembled in a small gap, the bolt 4 can penetrate through the pin bush 3 due to the gap, and the assembling stability and the torque transmission reliability are guaranteed.
Referring to fig. 4 and 5, chamfers 31 are provided at the edges of the two ends of the pin bush 3 to provide a guiding function and facilitate the assembly of the pin bush 3.
The connecting through holes 61 are uniformly arranged along the circumferential direction of the flange 6, so that the shearing force generated among the pin bush 3, the hub 2 and the main shaft 1 is uniformly distributed.
The plurality of connecting blind holes 21 are uniformly arranged along the circumferential direction of the hub 2, so that the shearing force generated among the pin sleeve 3, the hub 2 and the main shaft 1 is uniformly distributed.
Referring to fig. 6, preferably, the bolts 4 may be high-strength hydraulic tension bolts, and when the bolts 4 are installed, a pre-tightening force is applied to the bolts 4 through a hydraulic tensioner, and then the bolts are tightened by a hydraulic nut 5, so as to ensure the axial and radial fixation between the main shaft 1 and the hub 2, and a friction force generated by the pre-tightening force of the high-strength hydraulic tension bolts can be used for transmitting a part of the torque of the turbine rotor.
Referring to fig. 7, preferably, the nut 5 may be a high-strength hydraulic nut used for tightening a high-strength hydraulic tension bolt, and the high-strength hydraulic tension bolt may be prevented from loosening during operation by applying a hydraulic force directly to the nut 5 to generate a pre-tightening force.
When a main shaft 1 of a turbine rotor is assembled with a hub 2, pin sleeves 3 are respectively installed in 2 connecting blind holes 21 in the 180-degree direction on the hub 2, and a special guiding tool is inserted, the thin end of the special guiding tool faces upwards, the position of the main shaft 1 can be controlled by the special guiding tool, the guiding and installing effects are achieved, the assembling precision is ensured, the rotor is convenient to disassemble and assemble during maintenance, and the special guiding tool can be disassembled after the main shaft 1 is installed; bolts 4 are respectively arranged in the other connecting blind holes 21, and a part of pin sleeves 3 are arranged; hoisting the main shaft 1, slowly loading, checking the matching condition of the pin bush 3 and the main shaft 1, if collision and jamming occur, grinding the pin bush 3 to ensure that the diameter clearance between the pin bush and the main shaft 1 meets the assembly requirement, gradually loading the pin bush 3 into all the connecting blind holes 21, and numbering the pin bush 3 with the connecting through holes 61 and the connecting blind holes 21 in a one-to-one correspondence manner; taking out all the pin sleeves 3, cleaning and drying, then re-installing all the pin sleeves 3 into corresponding connecting blind holes 21 according to numbers, installing bolts 4, hanging the main shaft 1 until the end face of the flange 6 of the main shaft 1 is completely attached to the end face of the hub 2, installing nuts 5, and simultaneously fixing and assembling by using two hydraulic stretchers.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, therefore, any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A connecting device for a main shaft and a hub of a turbine rotor is characterized in that: comprises a pin bush (3), a bolt (4), a nut (5) and a flange (6); the flange (6) is coaxially assembled on the main shaft (1) of the turbine rotor, a plurality of connecting through holes (61) are arranged on the flange (6) at intervals, and each connecting through hole (61) is a counter bore with a large aperture at one end and a small aperture at the other end; a plurality of connecting blind holes (21) are arranged on a hub (2) of the turbine rotor at intervals, and each connecting blind hole (21) is a counter bore with a large aperture at one end and a small aperture at the other end; when the main shaft (1) is connected with the hub (2), the connecting through holes (61) are respectively in one-to-one correspondence with the connecting blind holes (21), and the large head ends of the connecting through holes (61) are coaxially butted with the large head ends of the connecting blind holes (21); the two ends of the pin bush (3) are correspondingly embedded in the large head end of the connecting through hole (61) and the large head end of the connecting blind hole (21), one end of the bolt (4) coaxially penetrates through the pin bush (3) and is screwed in the small head end of the connecting blind hole (21) in a threaded matching mode, the other end of the bolt (4) penetrates through the flange (6) through the connecting through hole (61) and is screwed in a matching mode with the nut (5), the end face of the flange (6) is attached to and locked with the end face of the hub (2), and therefore the main shaft (1) and the hub (2) are assembled and fixed.
2. A coupling device for a rotor shaft and a hub of a turbine according to claim 1, wherein: the outer diameter of the pin bush (3) is smaller than the inner diameter of the large head end of the connecting through hole (61) and the inner diameter of the large head end of the connecting blind hole (21), and the length of the pin bush (3) is smaller than the total length of the large head end of the connecting through hole (61) and the large head end of the connecting blind hole (21), so that the pin bush (3) can be assembled with the large head end of the connecting through hole (61) and the large head end of the connecting blind hole (21) in a small clearance mode.
3. A coupling device for a rotor shaft and a hub of a turbine according to claim 2, wherein: the assembly clearance between the pin bush (3) and the large head end of the connecting through hole (61) and the large head end of the connecting blind hole (21) is 0.02-0.05 mm.
4. A coupling device for a rotor shaft and a hub of a turbine according to claim 1 or 2, wherein: the inner diameter of the pin sleeve (3) is larger than the outer diameter of the bolt (4), so that the pin sleeve (3) can be assembled with the bolt (4) in a small gap.
5. A coupling device for a rotor shaft and a hub of a turbine according to claim 1 or 2, wherein: and chamfers (31) are arranged at the edges of the two ends of the pin sleeve (3).
6. A coupling device for a rotor shaft and a hub of a turbine according to claim 1 or 2, wherein: the connecting through holes (61) are uniformly arranged along the circumferential direction of the flange (6).
7. A coupling device for a rotor shaft and a hub of a turbine according to claim 1 or 2, wherein: the plurality of connecting blind holes (21) are uniformly arranged along the circumferential direction of the hub (2).
8. A coupling device for a rotor shaft and a hub of a turbine according to claim 1, wherein: the bolt (4) is a high-strength hydraulic tension bolt.
9. A coupling device for a rotor shaft and a hub of a turbine according to claim 1, wherein: the nut (5) is a high-strength hydraulic nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021632361.5U CN213235136U (en) | 2020-08-07 | 2020-08-07 | Connecting device for a main shaft and a hub of a turbine rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021632361.5U CN213235136U (en) | 2020-08-07 | 2020-08-07 | Connecting device for a main shaft and a hub of a turbine rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213235136U true CN213235136U (en) | 2021-05-18 |
Family
ID=75893408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021632361.5U Active CN213235136U (en) | 2020-08-07 | 2020-08-07 | Connecting device for a main shaft and a hub of a turbine rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213235136U (en) |
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2020
- 2020-08-07 CN CN202021632361.5U patent/CN213235136U/en active Active
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