阅读说明：本技术 一种立式水轮发电机的大轴拆卸方法 (Method for disassembling large shaft of vertical hydraulic generator ) 是由 李明 黄波 于 2020-04-23 设计创作，主要内容包括：本发明公开了一种立式水轮发电机的大轴拆卸方法,包括用楔块将转轮与基础环之间的间隙楔紧、将转子和转轮整体顶升至一定高度使转轮与基础环楔块之间的间隙大于第一下法兰与第一上法兰之间法兰连接止口分离间隙、拆卸第一上法兰与第一下法兰之间的部分联轴螺栓、安装转轮提升器使其承载转轮的重量、拆除剩余的联轴螺栓、将转轮平稳下放到楔块上,并确保第一下法兰与第一上法兰之间的法兰连接止口完全分离,完成水轮机大轴与发电机大轴的分离等几个步骤。本发明拆卸方法采取楔块先将转轮定位,转轮保持原有的水平,避免转轮水平度和中心发生重大偏移,从而降低整个施工过程中的难度。(The invention discloses a method for disassembling a large shaft of a vertical hydraulic generator, which comprises the steps of wedging a gap between a rotating wheel and a foundation ring by using wedge blocks, integrally jacking a rotor and the rotating wheel to a certain height to ensure that the gap between the rotating wheel and the wedge blocks of the foundation ring is larger than the separation gap of a flange connecting seam allowance between a first lower flange and a first upper flange, disassembling part of shaft connecting bolts between the first upper flange and the first lower flange, installing a rotating wheel lifter to bear the weight of the rotating wheel, disassembling the rest shaft connecting bolts, stably placing the rotating wheel on the wedge blocks, ensuring that the flange connecting seam allowance between the first lower flange and the first upper flange is completely separated, and completing the separation of the large shaft of the hydraulic generator from the large shaft. The dismounting method of the invention adopts the wedge block to position the rotating wheel firstly, the rotating wheel keeps the original level, and the serious deviation of the levelness and the center of the rotating wheel is avoided, thereby reducing the difficulty in the whole construction process.)

1. A method for disassembling a large shaft of a vertical hydraulic generator is characterized by comprising the following steps:

s1, wedging a gap between the rotating wheel (2) and the basic ring (3) by using the wedge block (1), and fixing the wedge block (1) to ensure that the level and the center of the rotating wheel (2) are not changed;

s2, integrally jacking the rotor (4) and the rotating wheel (2) to a certain height by using a rotor jacking device, wherein the gap between the rotating wheel (2) and the foundation ring (3) is H1, a flange connecting spigot (9) is arranged between a first lower flange (6) of the water turbine large shaft (5) and a first upper flange (8) of the generator large shaft (7), and the vertical length of the flange connecting spigot (9) is H2, so that the condition that H1 is more than H2 is met;

s3, detaching part of the coupling bolts (10) between the first upper flange (8) and the first lower flange (6), and reserving part of the coupling bolts (10) not to be detached so as to ensure that the rotating wheel (2) is not separated from the rotor (4);

s4, installing a runner lifter (11) between the first upper flange (8) and the first lower flange (6) to bear the weight of the large shaft (5) and the runner (2) of the water turbine, and removing the rest coupling bolts (10);

s5, the runner (2) is stably lowered onto the wedge block (1) through the runner lifter (11), and the flange connection spigot (9) between the first lower flange (6) and the first upper flange (8) is completely separated, so that the separation of the large shaft (5) of the water turbine and the large shaft (7) of the generator is completed.

2. The method for disassembling the large shaft of a vertical hydro-generator according to claim 1, wherein the fixing manner between the wedge blocks (1) and the foundation ring (3) is spot welding.

3. The method for disassembling the large shaft of a vertical hydro-generator according to claim 2, wherein the rotor lifting device is a damper (12).

4. The method for disassembling the large shaft of the vertical hydro-generator according to claim 3, wherein the damper (12) is locked after the rotor (4) and the runner (2) are integrally lifted up to a certain height by the damper (12) at step S2.

5. A method for dismounting a large shaft of a vertical hydro-generator according to claim 3, wherein the runner lifter (11) is an assembly of a hydraulic jack (18) and a screw (19).

6. The method for disassembling the large shaft of the vertical hydraulic generator according to claim 2, wherein the flange connecting seam allowance (9) is a groove (13) and a convex part (14) which are matched with each other, one of the groove (13) and the convex part (14) is arranged on the first upper flange (8), the other one of the groove (13) and the convex part (14) is arranged on the first lower flange (6), and the vertical height of the matched surface of the groove (13) and the convex part (14) is H2.

7. A method for disassembling a large shaft of a vertical hydraulic generator is characterized by comprising the following steps:

s1, wedging a gap between the rotating wheel (2) and the basic ring (3) by using the wedge block (1), and fixing the wedge block (1) to ensure that the level and the center of the rotating wheel (2) are not changed;

s2, integrally jacking the rotor (4) and the rotating wheel (2) to a certain height by using a rotor jacking device, wherein the gap between the rotating wheel (2) and the foundation ring (3) is H1, a flange connecting spigot (9) is arranged between a second lower flange (20) of the generator large shaft (7) and a second upper flange (21) of the rotor (4), the vertical length of the flange connecting spigot (9) is H2, and H1 & gtH 2 is met;

s3, detaching part of coupling bolts (10) between the second upper flange (21) and the second lower flange (20), and reserving part of coupling bolts (10) for not detaching so as to ensure that a generator large shaft (7) is not separated from a rotor (4);

s4, installing a runner lifter (11) between the second upper flange (21) and the second lower flange (20) to bear the weight of the generator large shaft (7), the water turbine large shaft (5) and the runner (2), and removing the rest coupling bolts (10);

s5, the rotating wheel (2) is stably lowered onto the wedge block (1) through the rotating wheel lifter (11), and the flange connection spigot (9) between the second lower flange (20) and the second upper flange (21) is completely separated, so that the rotor (4) and the generator large shaft (7) are separated.

8. The method for disassembling the large shaft of the vertical hydraulic generator according to claim 7, wherein the flange connecting seam allowance (9) is a groove (13) and a convex part (14) which are matched with each other, one of the groove (13) and the convex part (14) is arranged on the second upper flange (21), the other one of the groove (13) and the convex part (14) is arranged on the second lower flange (20), and the vertical height of the matched surface of the groove (13) and the convex part (14) is H2.

Technical Field

The invention relates to a vertical hydraulic generator, in particular to a method for disassembling a large shaft of a vertical hydraulic generator.

Background

When the vertical hydraulic generator is overhauled, the mode of putting the rotating wheel down on the basic ring is adopted to carry out water-generating coupling separation work (when the rotating wheel runs at the running height after the machine set is shut down, the rotating wheel and the basic ring have a certain gap in the vertical direction, and the bottom of the rotating wheel which is hoisted is horizontal). The main steps of disassembly are as follows: (1) disassembling the coupling bolts (4 are reserved); (2) mounting a runner lifter to bear the weight of the runner, and then removing the rest 4 bolts; (3) and (4) lowering the rotating wheel onto the foundation ring by using a rotating wheel lifter to separate the large shaft flange. In the process of construction by adopting the method, because the levelness of the plane of the foundation ring has deviation, the levelness and the center of the rotating wheel can deviate after the rotating wheel is placed down, and the following consequences are directly caused: (1) because the vertical surface clearance between the rotating wheel and the top cover and between the rotating wheel and the bottom ring is small, mutual collision and damage are easy to occur; (2) when the top cover is assembled and restored, the top cover is easy to collide with the rotating wheel, long-time adjustment is needed, the mounting difficulty is high, and the risk is high; (3) because the water-engine coupling bolt is tightly matched with the bolt hole on the flange, the coupling bolt is difficult to penetrate when the rotor is installed again.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a method for disassembling a large shaft of a vertical hydraulic generator, which can ensure that the levelness and the center of a rotating wheel do not generate great deviation and reduce the difficulty in the whole construction process.

In order to solve the technical problems, the invention adopts the following technical scheme:

a method for disassembling a large shaft of a vertical hydraulic generator comprises the following steps:

s1, wedging a gap between the rotating wheel and the foundation ring by using a wedge block, and fixing the wedge block to ensure that the level and the center of the rotating wheel are not changed;

s2, integrally jacking the rotor and the rotating wheel to a certain height by using a rotor jacking device, wherein the gap between the rotating wheel and the foundation ring is H1, a flange connecting spigot is arranged between a first lower flange of the large shaft of the water turbine and a first upper flange of the large shaft of the generator, the vertical length of the flange connecting spigot is H2, and H1 & gtH 2 is met;

s3, detaching part of coupling bolts between the first upper flange and the first lower flange, and reserving part of coupling bolts for not detaching so as to ensure that the rotating wheel is not separated from the rotor;

s4, installing a runner lifter between the first upper flange and the first lower flange to bear the weight of the large shaft and the runner of the water turbine, and removing the rest coupling bolts;

and S5, stably placing the rotating wheel on the wedge block by using the rotating wheel lifter, and ensuring that the flange connection spigot between the first lower flange and the first upper flange is completely separated to complete the separation of the large shaft of the water turbine and the large shaft of the generator.

As a further improvement of the above technical solution:

the wedge block and the foundation ring are fixed in a spot welding mode.

The rotor jacking device is an air brake.

In step S2, the rotor and the runner are integrally lifted to a certain height by the damper, and then the damper is locked.

The runner lifter is an assembly formed by a hydraulic jack and a screw rod.

The flange connecting spigot is a groove and a convex part which are matched with each other, one of the groove and the convex part is arranged on the first upper flange, the other one of the groove and the convex part is arranged on the first lower flange, and the vertical height of the matching surface of the groove and the convex part is H2.

A method for disassembling a large shaft of a vertical hydraulic generator comprises the following steps:

s1, wedging a gap between the rotating wheel and the foundation ring by using a wedge block, and fixing the wedge block to ensure that the level and the center of the rotating wheel are not changed;

s2, integrally jacking the rotor and the rotating wheel to a certain height by using a rotor jacking device, wherein the gap between the rotating wheel and the foundation ring is H1, a flange connecting spigot is arranged between a second lower flange of the generator large shaft and a second upper flange of the rotor, the vertical length of the flange connecting spigot is H2, and H1 & gt H2 is met;

s3, disassembling a part of coupling bolts between the second upper flange and the second lower flange, and reserving a part of coupling bolts for not disassembling so as to ensure that a large shaft of the generator is not separated from a rotor;

s4, installing a rotating wheel lifter between the second upper flange and the second lower flange to bear the weight of the large shaft of the generator, the large shaft of the water turbine and the rotating wheel, and removing the rest coupling bolts;

and S5, stably placing the rotating wheel on the wedge block by using the rotating wheel lifter, and ensuring that the flange connection seam allowance between the second lower flange and the second upper flange is completely separated to complete the separation of the rotor and the large shaft of the generator.

As a further improvement of the above technical solution:

the flange connection spigot is the recess and the convex part of mutually supporting, recess and convex part one set up on the second upper flange, and another setting is on the second lower flange, the vertical height of recess and convex part fitting surface is H2.

Compared with the prior art, the invention has the advantages that:

the method for disassembling the large shaft of the vertical hydraulic generator can adopt two modes to disassemble the large shaft: one is to disassemble the flange between the large shaft of the water turbine and the large shaft of the generator, the other is to disassemble the flange between the rotor and the large shaft of the generator, and the two disassembling methods are the same. Use the first kind as an example, take the voussoir earlier with the runner location, make the runner keep original level, and transfer the runner and control distance H1, make the runner transfer the back, keep better central point and levelness, reduced the risk that runner and top cap and bottom ring bump by a wide margin, adjustment work load when having reduced the top cap installation in a large number, top cap installation duration has been shortened, the rotor returns to hang back shaft coupling bolt and can easily penetrate, the construction degree of difficulty and risk have effectively been reduced, the overhaul time limit has been shortened.

Drawings

Fig. 1 is a schematic view of a large shaft dismounting process of a vertical hydro-generator according to embodiment 1 of the present invention.

Fig. 2 is a flowchart of a method for disassembling the large shaft of the vertical hydro-generator according to embodiment 1 of the present invention.

Fig. 3 is a schematic view of a large shaft dismounting process of the vertical hydro-generator according to embodiment 2 of the present invention.

The reference numerals in the figures denote:

1. a wedge block; 2. a rotating wheel; 3. a foundation ring; 4. a rotor; 5. a water turbine shaft; 6. a lower flange; 7. a generator shaft; 8. an upper flange; 9. the flange is connected with a spigot; 10. a coupling bolt; 11. a wheel hoist; 12. a damper; 13. a groove; 14. a convex portion; 15. a stator; 16. a top cover; 17. a bottom ring; 18. a hydraulic jack; 19. a screw; 20. a second lower flange; 21. a second upper flange.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.