Turbonator rotor fan blade overspeed device

Abstract

The utility model discloses a turbonator rotor fan blade overspeed device, which relates to the technical field of turbonator and rotor assembly and comprises an overspeed bottom plate, a bearing seat, an overspeed shaft, an overspeed disc and a fan blade fastening hole. The bearing seat is assembled on the overspeed bottom plate, a bearing is assembled in the bearing seat, the overspeed shaft is horizontally and rotatably assembled in the bearing, the overspeed disc is fixedly assembled on the overspeed shaft, and the outer circular face and the end face of the overspeed disc are each provided with a plurality of fan blade combining holes. The outer circle face and the end face of the overspeed disc are each provided with a plurality of fan blade combining holes, the turbine generator rotor fan blades are installed in the fan blade combining holes in the outer circle face of the overspeed disc in the radial direction, and the turbine generator rotor fan blades are installed in the fan blade combining holes in the end face of the overspeed disc in the axial direction. That is, the same overspeed disc can meet the overspeed of the two kinds of fan blades of axial combining and radial combining so as to meet the actual requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine generators and rotor assembly technology, and more specifically relates to an overspeed device for the rotor blades of a steam turbine generator. Background Art

[0002] When the rotor of a steam turbine generator is assembled at the manufacturing plant, the blades need to run at a specified speed with the rotating shaft for a period of time to complete the overspeed test of the blades, verify their mechanical strength, and ensure that the blades will not deform or break during the operation of the unit.

[0003] In the prior art, the patent with the publication number CN202338478U discloses a general overspeed test turntable for the blades of a generator cooling fan, which includes a turntable base plate and adjusting inserts. There are 8 T-shaped grooves arranged on the outer circle of the turntable base plate, and adjusting inserts are installed in each T-shaped groove. The beneficial technical effect of the utility model is that the adjusting inserts can be selected according to the diameter of the generator cooling fan seat, and the adjusting inserts are installed in the T-shaped grooves on the outer circle of the overspeed test turntable, then the cooling fan blades with the corresponding fan seat diameter can be installed for the overspeed test, avoiding the damage to large bearings caused by disassembling and assembling the overspeed test turntable, avoiding the large amount of financial and material resources consumed in manufacturing the overspeed test turntable, and avoiding the waste of human and material resources caused by replacing the overspeed test turntable.

[0004] The overspeed test turntable disclosed in the above patent consists of a speed base plate and adjusting inserts. Different inserts in the T-shaped grooves arranged on the outer circle of the turntable base plate are used to adjust the different outer circle sizes of the overspeed turntable to meet the requirements of installing cooling fans with different diameters of fan seat rings. That is, it installs the blades in a radial clamping manner.

[0005] The existing blade installation has two forms: radial clamping and axial clamping for installing the blades. In the radial clamping method, the blades are only installed by the force of bolts. Generally, units that do not need to be started and stopped frequently adopt radial clamping. The axially clamped blades have higher reliability and are installed by the force of the spigot. It is suitable for relatively complex working conditions. For example, in solar thermal projects and gas turbine projects, axially clamped blades are used.

[0006] However, the above patent only installs the blades in a radial clamping manner and cannot install the blades in an axial clamping manner, so it does not meet the actual requirements. Summary of the Utility Model

[0007] In order to overcome the defects existing in the above prior art, the purpose of the utility model is to provide an overspeed device for the rotor blades of a steam turbine generator to solve the problems existing in the prior art that only installs the blades in a radial clamping manner. The utility model performs overspeed tests on two types of blades, axial clamping and radial clamping, on the same overspeed turntable to meet the actual requirements.

[0008] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0009] An overspeed device for the rotor blades of a steam turbine generator, comprising an overspeed base plate, a bearing housing, an overspeed shaft, an overspeed disc and blade fastening holes;

[0010] The bearing housing is assembled on the overspeed base plate and is internally provided with bearings. The overspeed shaft is horizontally rotatably assembled in the bearings. The overspeed disc is fixedly assembled on the overspeed shaft. A plurality of the blade fastening holes are provided on the outer circumferential surface and the end surface of the overspeed disc.

[0011] Preferably, a limiting step is provided on the overspeed shaft. One end of the overspeed disc abuts against the limiting step, and the other end abuts against a stop block. The stop block is assembled on the overspeed shaft through bolts.

[0012] Preferably, a first groove is provided on the outer surface of the overspeed shaft, and a second groove is provided on the inner side of the overspeed disc. The first groove and the second groove cooperate with each other, and a key is assembled in the keyway formed by the two.

[0013] Preferably, two bearing housings are assembled on the overspeed base plate, and the overspeed shaft is horizontally assembled in the bearings of the two bearing housings.

[0014] Preferably, two overspeed discs are assembled on the overspeed shaft, and the blade fastening holes on the end surfaces of the two overspeed discs are arranged oppositely.

[0015] Preferably, the overspeed disc comprises a plurality of sets of overspeed discs of different models.

[0016] Preferably, a transition disc is assembled at one end of the overspeed shaft, and the transition disc is connected to the gearbox through a diaphragm coupling.

[0017] Preferably, the transition disc is assembled at one end of the overspeed shaft through bolts.

[0018] Preferably, an inner stop is provided at one end of the overspeed shaft, and an outer stop cooperating with the inner stop is provided on the transition disc.

[0019] Preferably, the blade fastening holes are evenly arranged on the outer circumferential surface and the end surface of the overspeed disc, and the blade fastening holes are bolt holes.

[0020] The beneficial effects of the present utility model are as follows:

[0021] For the overspeed device for the rotor blades of a steam turbine generator provided by the present utility model, a plurality of blade fastening holes are provided on both the outer circumferential surface and the end surface of the overspeed disc. A plurality of blade fastening holes on the outer circumferential surface of the overspeed disc radially mount the rotor blades of the steam turbine generator, and a plurality of blade fastening holes on the end surface of the overspeed disc axially mount the rotor blades of the steam turbine generator. That is, the same overspeed disc can meet the overspeed of the blades in both axial fastening and radial fastening to meet the actual requirements.

[0022] The overspeed device for the rotor blades of a turbogenerator provided by the present utility model has a relatively small overspeed disk, a simple assembly process, and is also convenient for storage, enabling the overspeed test of the blades to be completed in a relatively short time; various types of blade overspeed tests can be completed by replacing different overspeed disks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the overspeed device for the rotor blades of a turbogenerator of the present utility model;

[0024] Figure 2 is a front view of the overspeed device for the rotor blades of a turbogenerator of the present utility model;

[0025] Figure 3 is a front view of the overspeed disk of the present utility model;

[0026] Figure 4 is a side view of the overspeed disk of the present utility model;

[0027] Figure 5 is a front view of the overspeed shaft of the present utility model;

[0028] Figure 6 is a schematic diagram of the installation of the transition disk of the present utility model;

[0029] REFERENCE MARKS:

[0030] 1, overspeed bottom plate; 2, bearing seat; 3, overspeed shaft; 4, overspeed disk; 5, blade fastening hole; 6, limiting step; 7, stop block; 8, transition disk; 9, inner stop; 10, outer stop. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The concept, specific structure, and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and the drawings to fully understand the purpose, features, and effects of the present utility model.

[0032] Embodiment 1

[0033] An overspeed device for the rotor blades of a turbogenerator, as Figures 1-6 shown, includes an overspeed bottom plate 1, a bearing seat 2, an overspeed shaft 3, an overspeed disk 4, and a blade fastening hole 5;

[0034] The bearing seat 2 is assembled on the overspeed bottom plate 1 and a bearing is assembled therein. The overspeed shaft 3 is horizontally rotatably assembled in the bearing. The overspeed disk 4 is fixedly assembled on the overspeed shaft 3. A plurality of the blade fastening holes 5 are provided on the outer circumferential surface and the end surface of the overspeed disk 4.

[0035] In this utility model, the overspeed base plate 1 is used to support the overspeed device; the bearing housing 2 is used to assemble bearings to facilitate the rotation of the overspeed shaft 3; the overspeed shaft 3 is used to rotate and drive the overspeed disc 4 to rotate; the overspeed disc 4 is used to drive the blades of the steam turbine generator rotor to rotate for blade overspeed tests to verify its mechanical strength and ensure that the blades will not deform or break during the operation of the unit; the blade fastening holes 5 are used to install the blades. Specifically, the blade fastening holes 5 on the outer cylindrical surface of the overspeed disc 4 are radially installed with the blades of the steam turbine generator rotor, and the blade fastening holes 5 on the end surface of the overspeed disc 4 are axially installed with the blades of the steam turbine generator rotor. That is, the same overspeed disc 4 can meet the two types of blade overspeed, axial fastening and radial fastening, to meet the actual needs.

[0036] In this embodiment, the blade fastening holes 5 are evenly arranged on the outer cylindrical surface and the end surface of the overspeed disc 4, and the blade fastening holes 5 are bolt holes.

[0037] Embodiment 2

[0038] This embodiment is further elaborated on the basis of Embodiment 1, as Figure 1 and 2 shown, a limit step 6 is provided on the overspeed shaft 3. One end of the overspeed disc 4 abuts against the limit step 6, and the other end abuts against a stop block 7. The stop block 7 is assembled on the overspeed shaft 3 by bolts. The overspeed disc 4 is axially limited by the limit step 6 and the stop block 7 to prevent the overspeed disc 4 of the blade from axially moving during the test.

[0039] A first groove is provided on the outer surface of the overspeed shaft 3, and a second groove is provided on the inner side of the overspeed disc 4. The first groove and the second groove cooperate with each other and a key is assembled in the keyway formed by the two to assemble the overspeed disc 4 on the overspeed shaft 3.

[0040] As Figure 1 and 2 shown, two bearing housings 2 are assembled on the overspeed base plate 1, and the overspeed shaft 3 is horizontally assembled in the bearings of the two bearing housings 2.

[0041] As Figure 1 and 2 shown, two overspeed discs 4 are assembled on the overspeed shaft 3, and the blade fastening holes 5 on the end surfaces of the two overspeed discs 4 are arranged opposite to each other. The actual appearance of the rotating shaft is that there is a fan seat ring at each of the steam and excitation ends. Therefore, two overspeed discs 4 are provided to correspond to the two fan seat rings.

[0042] The overspeed disc 4 includes several sets of overspeed discs of different models.

[0043] In this embodiment, the overspeed shaft 3 is made of high-strength forgings, with a maximum outer diameter of φ450mm and a length of 1650mm. The overall structure is small and compact, and the rigid strength of the overspeed shaft 3 meets the experimental requirements. The surface of the overspeed shaft 3 is provided with grooves and screw holes. The wind turbine overspeed disk 4 is driven by a key inserted into the groove of the overspeed shaft 3, and the stop block 7 is fastened to the overspeed shaft 3 by bolts to prevent the axial movement of the wind turbine overspeed disk 4 during the test.

[0044] The wind turbine overspeed disk 4 is made of high-strength forgings, with a total of three sets, meeting the test requirements of different models. The maximum diameter of the wind turbine overspeed disk 4 is φ886mm. The outer circumferential surface and the end face are both provided with wind turbine fastening screw holes for testing wind turbines with different fastening methods. A groove is opened at the top of its inner circle and is driven by a key with the overspeed shaft.

[0045] One end of the overspeed shaft 3 is equipped with a transition disk 8, and the transition disk 8 is connected to the gearbox through a diaphragm coupling. Specifically, the transition disk 8 is assembled to one end of the overspeed shaft 3 by bolts. An inner stop 9 is provided at one end of the overspeed shaft 3, and an outer stop 10 that mates with the inner stop 9 is provided on the transition disk 8, and the outer stop 10 is embedded in the inner stop 9.

[0046] In this embodiment, an inner stop is provided on the connection side of the overspeed shaft 3 and the gearbox. The transition disk 8 is fastened to the overspeed shaft 3 by bolts, and the gearbox and the transition disk 8 are connected through a diaphragm coupling.

[0047] To better understand the present invention, the working principle of the present invention will be described completely as follows:

[0048] When performing radial fastening of the wind turbine overspeed, the specific installation method is as follows: Arrange the wind turbine along the radial direction of the overspeed disk 4, insert the bolts at the bottom end of the wind turbine into the wind turbine fastening holes 5 on the outer circumferential surface of the overspeed disk 4, and fix them with nuts after the bolts pass through the wind turbine fastening holes 5 to fix the wind turbine and radially fasten the wind turbine to the wind turbine overspeed disk 4.

[0049] When performing axial fastening of the wind turbine overspeed, the specific installation method is as follows: Arrange the wind turbine along the radial direction of the overspeed disk 4, and its bottom end side abuts against the end face of the overspeed disk 4 and is embedded in the stop. Then, use bolts to horizontally pass through the bottom of the wind turbine and threadedly assemble them into the wind turbine fastening holes 5 on the end face of the overspeed disk 4 to fix the wind turbine and axially fasten the wind turbine to the wind turbine overspeed disk 4.

[0050] A number of wind turbine fastening holes 5 can be used to install a number of wind turbines with bolts.

[0051] When conducting the overspeed experiment on the rotor blades of a turbogenerator, the gearbox drives the transition disk 8 to rotate through a diaphragm coupling, thereby driving the overspeed shaft 3 to rotate. The overspeed shaft 3 then drives the overspeed disk 4 to rotate, so as to drive the blades assembled on the overspeed disk 4 to rotate, conduct the overspeed test on the blades, verify their mechanical strength, and ensure that the blades will not deform or break during the operation of the unit.

[0052] The above has specifically described the embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalents or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A turbine generator rotor blade overspeed device, characterized in that: It comprises an overspeed base plate (1), a bearing seat (2), an overspeed shaft (3), an overspeed disc (4) and a fan blade handle hole (5); The bearing seat (2) is mounted on the overspeed base plate (1) and has a bearing mounted therein; the overspeed shaft (3) is mounted in the bearing for horizontal rotation; the overspeed disc (4) is fixedly mounted on the overspeed shaft (3); and the outer circumferential surface and end surface of the overspeed disc (4) are both provided with a plurality of blade engagement holes (5).

2. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: A limiting step (6) is provided on the overspeed shaft (3); one end of the overspeed disc (4) abuts against the limiting step (6) and the other end abuts against a stopper (7); and the stopper (7) is assembled on the overspeed shaft (3) by means of bolts.

3. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: The outer surface of the overspeed shaft (3) is provided with a first groove, and the inner side of the overspeed disc (4) is provided with a second groove, the first groove and the second groove match each other, and a key is installed in the keyway formed by the two.

4. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: Two bearing seats (2) are mounted on the overspeed base plate (1), and the overspeed shaft (3) is horizontally mounted in the bearings of the two bearing seats (2).

5. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: The overspeed shaft (3) is equipped with two overspeed discs (4), and the fan blade engaging holes (5) on the end surfaces of the two overspeed discs (4) are arranged opposite to each other.

6. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: The overspeed disc (4) comprises several sets of overspeed discs of different models.

7. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: A transition plate (8) is mounted on one end of the overspeed shaft (3), and the transition plate (8) is connected to the gear box via a diaphragm coupling.

8. The turbine generator rotor blade overspeed device according to claim 7, characterized in that: The transition plate (8) is assembled on one end of the overspeed shaft (3) by means of bolts.

9. The turbine generator rotor blade overspeed device according to claim 7, characterized in that: An inner stop (9) is provided at one end of the overspeed shaft (3), and an outer stop (10) matching with the inner stop (9) is provided on the transition plate (8).

10. The turbine generator rotor blade overspeed device according to claim 1, characterized in that: The fan blade handle holes (5) are evenly arranged on the outer circumferential surface and the end surface of the overspeed disc (4), and the fan blade handle holes (5) are bolt holes.

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