Method for dismounting a water turbine generator brake in a pit

Abstract

The application discloses a water-turbine-generator-brake dismounting method in a machine pit, and belongs to the technical field of water-turbine generators, characterized by comprising the following steps: a, removing connecting bolts connecting the brake and a brake support, removing pipelines connected with the brake, and fixing the brake below a rotor magnetic yoke; b, rotating the rotor through turning, and moving the brake to between two lower-machine-frame supporting arms of a lower machine frame; c, erecting an inner platform and an outer platform below the brake, and making the brake fall on the inner platform; d, moving the brake along the inner platform to the outer platform; and e, adjusting the height of the outer platform, making the height of the outer platform consistent with the height of a stator-machine-base supporting pier, and pulling out the brake from the gap between a stator machine base and the stator-machine-base supporting pier. The application can directly dismount the brake in the machine pit without removing the rotor, improves the dismounting efficiency, greatly reduces the brake maintenance workload, shortens the maintenance period, and reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, and in particular to a method for disassembling the brake device of a hydro-generator inside the machine pit. Background Technology

[0002] The mechanical brake is the most commonly used braking device in hydro-generators, located on the lower frame support arm, below the rotor yoke. When the generator needs to be stopped, the mechanical brake is activated, high-pressure gas is introduced into the brake cylinder, the cylinder lifts the brake plate, and the brake plate contacts the brake ring below the yoke, reducing the generator speed through friction braking until it stops. The sealing strip inside the cylinder used to seal the high-pressure gas, and the brake plate itself, are consumable parts; if replacement is needed, the brake must be lifted out of the generator pit. The brake is quite heavy, typically weighing several hundred kilograms, requiring lifting equipment for disassembly. However, the space on the lower frame where the brake is located is relatively narrow, and the rotor obstructs the view of the brake from above, making it impossible for the plant crane to directly lift the brake.

[0003] Chinese patent document CN107342655A, published on November 10, 2017, discloses a braking system and its installation method for a bulb-type turbine generator. The braking system includes a stator base, a generator body fixed within the stator base, and an upstream flange of the stator sandwiched between the stator base and the bulb head. The system is characterized by further including a detachable braking assembly fixed to the upstream flange of the stator and extending towards the generator body, as well as at least one set of ventilation assemblies and at least one set of wind deflectors. Multiple ventilation assemblies are fixed to the upstream flange of the stator and are evenly spaced around the circumference. Multiple wind deflectors are detachably fixed to the upstream flange of the stator base. Inside the stator frame, each component is connected to multiple ventilation assemblies via the stator upstream flange, forming independent single-cycle air supply units. Two of these ventilation assemblies form a ventilation and cooling unit, which are evenly distributed along the axis of the stator frame at a circumferential angle of 60°. The wind baffle assembly includes a brake wind baffle, a circular wind baffle, a maintenance cover, and a main wind baffle. The brake wind baffle and the circular wind baffle are integrally fixed to the stator upstream flange and move together. The maintenance cover is fixed to the stator upstream flange and is positioned opposite the ventilation assemblies on the other side of the stator upstream flange. The main wind baffle is coaxial with the stator frame and connected to the maintenance cover to form a sealed unit.

[0004] The method for installing a braking system is characterized by comprising the following steps:

[0005] Step A: Secure the brake to the brake base plate;

[0006] Step B: The brake removal and installation tools are fixed to the brake base plate;

[0007] Step C: Use a crane to lift and disassemble the tools;

[0008] Step D: Fix the brake and brake base plate to the stator frame using the disassembly and assembly tools;

[0009] Step E: Remove the disassembly and assembly tools to complete the installation of the brake.

[0010] The patent document discloses a braking system and installation method for a bulb-type turbine generator. This system involves installing a disassembly and assembly tool within the braking assembly. The tool is detachably fixed to the brake base plate and drivably connected to the brake, thus enabling brake disassembly. However, the disassembly efficiency is still low, and the maintenance cycle is long. Summary of the Invention

[0011] In order to overcome the shortcomings of the prior art, the present invention provides a method for disassembling a hydro-generator brake inside the machine pit. The present invention can directly disassemble the brake inside the machine pit without removing the rotor, thereby improving disassembly efficiency, greatly reducing the workload of brake maintenance, shortening the maintenance cycle, and reducing maintenance costs.

[0012] This invention is achieved through the following technical solution:

[0013] A method for disassembling a hydro-generator brake in its pit, characterized by comprising the following steps:

[0014] a. Remove the connecting bolts connecting the brake to the brake bracket, disconnect the pipes connected to the brake, and fix the brake below the rotor yoke;

[0015] b. Rotate the rotor by turning the crankshaft to move the brake between the two lower frame support arms;

[0016] c. Construct an inner platform and an outer platform under the brake, and place the brake on the inner platform.

[0017] d. Move the brake along the inner platform to the outer platform;

[0018] e. Adjust the height of the outer platform so that it is consistent with the height of the stator support, and pull the brake out from the gap between the stator and the stator support.

[0019] In step a, fixing the brake below the rotor yoke specifically means connecting one end of the connector to the suspension point of the brake, and fixing the other end of the connector to the bottom of the yoke.

[0020] The connector is a rope, strap, or chain.

[0021] The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

[0022] Specifically, step b refers to lifting the rotor using a high-pressure oil jacking device, rotating the rotor by turning it, and stopping the turning when the rotor drives the brake to rotate between the two lower frame support arms.

[0023] Step c specifically refers to setting up an inner platform below the brake, ensuring that the distance from the inner platform to the lower end of the stator bar is greater than the axial height of the brake, adjusting the length of the suspension rope connecting the brake and the yoke, placing the brake on the inner platform, setting up an outer platform using telescopic outriggers, and adjusting the telescopic outriggers to make the outer platform the same height as the inner platform.

[0024] Specifically, step d refers to moving the brake from the inner platform to the outer platform by pulling the brake with a rope.

[0025] Specifically, step e refers to adjusting the telescopic outriggers of the outer platform to raise the outer platform. When the height of the outer platform is consistent with the height of the stator support, the brake is pulled radially outward to pull the brake from the outer platform through the gap between the stator and the stator support onto the stator support, thus completing the brake disassembly.

[0026] The beneficial effects of this invention are mainly reflected in the following aspects:

[0027] 1. This invention, a) removes the connecting bolts connecting the brake to the brake bracket, disconnects the pipes connected to the brake, and fixes the brake below the rotor yoke; b) rotates the rotor by turning the rotor to move the brake between the two lower frame supports; c) constructs an inner platform and an outer platform below the brake, and places the brake on the inner platform; d) moves the brake along the inner platform to the outer platform; e) adjusts the height of the outer platform to match the height of the stator support, and pulls the brake out from the gap between the stator and the stator support. Compared with the prior art, this invention allows the brake to be disassembled directly in the pit without removing the rotor, improving disassembly efficiency, greatly reducing brake maintenance workload, shortening maintenance cycle, and reducing maintenance costs.

[0028] 2. In this invention, the connecting component is a rope, strap, or chain, which has a simple structure and is easy to connect.

[0029] 3. In this invention, fixing the other end of the connector to the bottom of the yoke means hanging the connector on the lower fan located at the lower end of the yoke or fitting the connector onto the eye bolt on the mounting hole of the yoke brake ring. This can firmly fix the rotor yoke to the connector and ensure operational reliability.

[0030] 4. In this invention, step b specifically refers to lifting the rotor using a high-pressure oil lifting device, rotating the rotor by turning it, and stopping the turning when the rotor drives the brake to rotate between the two lower frame support arms. The operation is simple and facilitates subsequent disassembly of the brake.

[0031] 5. In this invention, step c specifically refers to setting up an inner platform below the brake, making the distance from the inner platform to the lower end of the stator bar greater than the axial height of the brake, adjusting the length of the suspension rope connecting the brake and the magnetic yoke, placing the brake on the inner platform, setting up an outer platform using telescopic outriggers, and adjusting the telescopic outriggers to make the outer platform the same height as the inner platform, which can effectively ensure the safety of disassembling the brake.

[0032] 6. In this invention, step d specifically refers to moving the brake from the inner platform to the outer platform by pulling the brake with a suspension rope. The brake is easy to move and facilitates quick disassembly. Attached Figure Description

[0033] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments:

[0034] Figure 1 This is a schematic diagram of the initial state of the brake after installation of the present invention;

[0035] Figure 2 This is a layout diagram of the outer platform of the present invention;

[0036] The markings in the diagram are: 1. Brake, 2. Brake bracket, 3. Connecting bolt, 4. Pipeline, 5. Rotor yoke, 6. Rotor, 7. Lower frame, 8. Inner platform, 9. Outer platform, 10. Stator base support, 11. Stator base, 12. Stator bar, 13. Lower frame support arm. Detailed Implementation

[0037] Example 1

[0038] See Figure 1 and Figure 2 A method for disassembling a hydro-generator brake in its pit includes the following steps:

[0039] a. Remove the connecting bolt 3 that connects the brake 1 to the brake bracket 2, disconnect the pipe 4 that connects to the brake 1, and fix the brake 1 below the rotor yoke 5.

[0040] b. By rotating the rotor 6 by turning the wheel, the brake 1 is moved to the space between the two lower frame support arms 13 of the lower frame 7;

[0041] c. Construct an inner platform 8 and an outer platform 9 below the brake 1, and place the brake 1 on the inner platform 8.

[0042] d. Move brake 1 along the inner platform 8 onto the outer platform 9;

[0043] e. Adjust the height of the outer platform 9 so that the height of the outer platform 9 is consistent with the height of the stator support 10, and pull the brake 1 out from the gap between the stator support 11 and the stator support 10.

[0044] This embodiment is the most basic implementation method, which can directly remove the brake 1 in the machine pit without removing the rotor 6, thereby improving the disassembly efficiency, greatly reducing the workload of brake 1 maintenance, shortening the maintenance cycle, and reducing maintenance costs.

[0045] Example 2

[0046] See Figure 1 and Figure 2 A method for disassembling a hydro-generator brake in its pit includes the following steps:

[0047] a. Remove the connecting bolt 3 that connects the brake 1 to the brake bracket 2, disconnect the pipe 4 that connects to the brake 1, and fix the brake 1 below the rotor yoke 5.

[0048] b. By rotating the rotor 6 by turning the wheel, the brake 1 is moved to the space between the two lower frame support arms 13 of the lower frame 7;

[0049] c. Construct an inner platform 8 and an outer platform 9 below the brake 1, and place the brake 1 on the inner platform 8.

[0050] d. Move brake 1 along the inner platform 8 onto the outer platform 9;

[0051] e. Adjust the height of the outer platform 9 so that the height of the outer platform 9 is consistent with the height of the stator support 10, and pull the brake 1 out from the gap between the stator support 11 and the stator support 10.

[0052] In step a, fixing the brake 1 below the rotor yoke 5 specifically means connecting one end of the connector to the suspension point of the brake 1, and fixing the other end of the connector to the bottom of the yoke.

[0053] The connector is a suspension rope.

[0054] The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

[0055] This embodiment is a preferred implementation method. The connecting component is a rope, strap, or chain, which has a simple structure and is easy to connect.

[0056] Example 3

[0057] See Figure 1 and Figure 2 A method for disassembling a hydro-generator brake in its pit includes the following steps:

[0058] a. Remove the connecting bolt 3 that connects the brake 1 to the brake bracket 2, disconnect the pipe 4 that connects to the brake 1, and fix the brake 1 below the rotor yoke 5.

[0059] b. By rotating the rotor 6 by turning the wheel, the brake 1 is moved to the space between the two lower frame support arms 13 of the lower frame 7;

[0060] c. Construct an inner platform 8 and an outer platform 9 below the brake 1, and place the brake 1 on the inner platform 8.

[0061] d. Move brake 1 along the inner platform 8 onto the outer platform 9;

[0062] e. Adjust the height of the outer platform 9 so that the height of the outer platform 9 is consistent with the height of the stator support 10, and pull the brake 1 out from the gap between the stator support 11 and the stator support 10.

[0063] In step a, fixing the brake 1 below the rotor yoke 5 specifically means connecting one end of the connector to the suspension point of the brake 1, and fixing the other end of the connector to the bottom of the yoke.

[0064] The connector is a sling.

[0065] The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

[0066] Furthermore, step b specifically refers to lifting the rotor 6 using a high-pressure oil lifting device, rotating the rotor 6 by turning it, and stopping the turning when the rotor 6 drives the brake 1 to rotate between the two lower frame support arms 13 of the lower frame 7.

[0067] This embodiment is another preferred implementation. Fixing the other end of the connector to the bottom of the yoke means hanging the connector on the lower fan located at the lower end of the yoke or attaching the connector to the eye bolt on the mounting hole of the yoke brake ring. This can firmly fix the rotor yoke 5 to the connector and ensure operational reliability.

[0068] Example 4

[0069] See Figure 1 and Figure 2 A method for disassembling a hydro-generator brake in its pit includes the following steps:

[0070] a. Remove the connecting bolt 3 that connects the brake 1 to the brake bracket 2, disconnect the pipe 4 that connects to the brake 1, and fix the brake 1 below the rotor yoke 5.

[0071] b. By rotating the rotor 6 by turning the wheel, the brake 1 is moved to the space between the two lower frame support arms 13 of the lower frame 7;

[0072] c. Construct an inner platform 8 and an outer platform 9 below the brake 1, and place the brake 1 on the inner platform 8.

[0073] d. Move brake 1 along the inner platform 8 onto the outer platform 9;

[0074] e. Adjust the height of the outer platform 9 so that the height of the outer platform 9 is consistent with the height of the stator support 10, and pull the brake 1 out from the gap between the stator support 11 and the stator support 10.

[0075] In step a, fixing the brake 1 below the rotor yoke 5 specifically means connecting one end of the connector to the suspension point of the brake 1, and fixing the other end of the connector to the bottom of the yoke.

[0076] The connector is a chain.

[0077] The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

[0078] Step b specifically refers to lifting the rotor 6 using a high-pressure oil lifting device, rotating the rotor 6 by turning it, and stopping the turning when the rotor 6 drives the brake 1 to rotate between the two lower frame support arms 13 of the lower frame 7.

[0079] Step c specifically refers to setting up an inner platform 8 below the brake 1, making the distance from the inner platform 8 to the lower end of the stator bar 12 greater than the axial height of the brake 1, adjusting the length of the suspension rope connecting the brake 1 and the magnetic yoke, placing the brake 1 on the inner platform 8, setting up an outer platform 9 using telescopic outriggers, and adjusting the telescopic outriggers to make the outer platform 9 the same height as the inner platform 8.

[0080] This embodiment is another preferred implementation. Step b specifically refers to lifting the rotor 6 by a high-pressure oil lifting device, rotating the rotor 6 by turning it, and stopping the turning when the rotor 6 drives the brake 1 to rotate between the two lower frame support arms 13 of the lower frame 7. The operation is simple and facilitates the subsequent disassembly of the brake 1.

[0081] Example 5

[0082] See Figure 1 and Figure 2A method for disassembling a hydro-generator brake in its pit includes the following steps:

[0083] a. Remove the connecting bolt 3 that connects the brake 1 to the brake bracket 2, disconnect the pipe 4 that connects to the brake 1, and fix the brake 1 below the rotor yoke 5.

[0084] b. By rotating the rotor 6 by turning the wheel, the brake 1 is moved to the space between the two lower frame support arms 13 of the lower frame 7;

[0085] c. Construct an inner platform 8 and an outer platform 9 below the brake 1, and place the brake 1 on the inner platform 8.

[0086] d. Move brake 1 along the inner platform 8 onto the outer platform 9;

[0087] e. Adjust the height of the outer platform 9 so that the height of the outer platform 9 is consistent with the height of the stator support 10, and pull the brake 1 out from the gap between the stator support 11 and the stator support 10.

[0088] In step a, fixing the brake 1 below the rotor yoke 5 specifically means connecting one end of the connector to the suspension point of the brake 1, and fixing the other end of the connector to the bottom of the yoke.

[0089] The connector is a suspension rope.

[0090] The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

[0091] Step b specifically refers to lifting the rotor 6 using a high-pressure oil lifting device, rotating the rotor 6 by turning it, and stopping the turning when the rotor 6 drives the brake 1 to rotate between the two lower frame support arms 13 of the lower frame 7.

[0092] Furthermore, step c specifically refers to setting up an inner platform 8 below the brake 1, making the distance from the inner platform 8 to the lower end of the stator bar 12 greater than the axial height of the brake 1, adjusting the length of the suspension rope connecting the brake 1 and the magnetic yoke, placing the brake 1 on the inner platform 8, setting up an outer platform 9 using telescopic outriggers, and adjusting the telescopic outriggers to make the outer platform 9 the same height as the inner platform 8.

[0093] Furthermore, step d specifically refers to moving the brake 1 from the inner platform 8 to the outer platform 9 by pulling the brake 1 with a suspension rope.

[0094] This embodiment is another preferred implementation. Step c specifically refers to setting up an inner platform 8 below the brake 1, making the distance from the inner platform 8 to the lower end of the stator bar 12 greater than the axial height of the brake 1, adjusting the length of the suspension rope connecting the brake 1 and the magnetic yoke, placing the brake 1 on the inner platform 8, setting up an outer platform 9 by means of telescopic outriggers, and adjusting the telescopic outriggers to make the outer platform 9 and the inner platform 8 at the same height, which can effectively ensure the safety of disassembling the brake 1.

[0095] Example 6

[0096] See Figure 1 and Figure 2 A method for disassembling a hydro-generator brake in its pit includes the following steps:

[0097] a. Remove the connecting bolt 3 that connects the brake 1 to the brake bracket 2, disconnect the pipe 4 that connects to the brake 1, and fix the brake 1 below the rotor yoke 5.

[0098] b. By rotating the rotor 6 by turning the wheel, the brake 1 is moved to the space between the two lower frame support arms 13 of the lower frame 7;

[0099] c. Construct an inner platform 8 and an outer platform 9 below the brake 1, and place the brake 1 on the inner platform 8.

[0100] d. Move brake 1 along the inner platform 8 onto the outer platform 9;

[0101] e. Adjust the height of the outer platform 9 so that the height of the outer platform 9 is consistent with the height of the stator support 10, and pull the brake 1 out from the gap between the stator support 11 and the stator support 10.

[0102] In step a, fixing the brake 1 below the rotor yoke 5 specifically means connecting one end of the connector to the suspension point of the brake 1, and fixing the other end of the connector to the bottom of the yoke.

[0103] The connector is a suspension rope.

[0104] The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

[0105] Step b specifically refers to lifting the rotor 6 using a high-pressure oil lifting device, rotating the rotor 6 by turning it, and stopping the turning when the rotor 6 drives the brake 1 to rotate between the two lower frame support arms 13 of the lower frame 7.

[0106] Step c specifically refers to setting up an inner platform 8 below the brake 1, making the distance from the inner platform 8 to the lower end of the stator bar 12 greater than the axial height of the brake 1, adjusting the length of the suspension rope connecting the brake 1 and the magnetic yoke, placing the brake 1 on the inner platform 8, setting up an outer platform 9 using telescopic outriggers, and adjusting the telescopic outriggers to make the outer platform 9 the same height as the inner platform 8.

[0107] Specifically, step d refers to moving the brake 1 from the inner platform 8 to the outer platform 9 by pulling the brake 1 with a rope.

[0108] Specifically, step e refers to adjusting the telescopic outriggers of the outer platform 9 to raise the outer platform 9. When the height of the outer platform 9 is consistent with the height of the stator support 10, the brake 1 is pulled radially outward to pull the brake 1 from the outer platform 9 through the gap between the stator support 11 and the stator support 10 onto the stator support 10, thus completing the removal of the brake 1.

[0109] This embodiment is the best implementation method. Step d specifically refers to pulling the brake 1 with a suspension rope to move the brake 1 from the inner platform 8 to the outer platform 9. The brake 1 is easy to move and facilitates quick disassembly.

[0110] When brake 1 needs to be reinstalled, simply reverse the above steps ae to reinstall brake 1 back to its original position. The entire disassembly and assembly process is simple and easy to perform.

Claims

1. A method for disassembling a hydro-generator brake inside the machine pit, characterized in that, Includes the following steps: a. Remove the connecting bolt (3) that connects the brake (1) to the brake bracket (2), remove the pipe (4) that connects to the brake (1), and fix the brake (1) below the rotor yoke (5); b. By rotating the rotor (6) by turning the wheel, the brake (1) is moved between the two lower frame arms (13) of the lower frame (7); c. Construct an inner platform (8) and an outer platform (9) under the brake (1), and place the brake (1) on the inner platform (8); d. Move the brake (1) along the inner platform (8) onto the outer platform (9); e. Adjust the height of the outer platform (9) so that the height of the outer platform (9) is consistent with the height of the stator support (10), and pull the brake (1) out from the gap between the stator support (11) and the stator support (10); Step c specifically refers to setting up an inner platform (8) under the brake (1) so that the distance from the inner platform (8) to the lower end of the stator bar (12) is greater than the axial height of the brake (1), adjusting the length of the suspension rope connecting the brake (1) and the yoke, placing the brake (1) on the inner platform (8), setting up an outer platform (9) through telescopic outriggers, and adjusting the telescopic outriggers so that the outer platform (9) is at the same height as the inner platform (8); Specifically, step d refers to pulling the brake (1) with a rope to move the brake (1) from the inner platform (8) to the outer platform (9).

2. The method for disassembling a hydro-generator brake in the machine pit according to claim 1, characterized in that: In step a, fixing the brake (1) below the rotor yoke (5) specifically means connecting one end of the connector to the suspension point of the brake (1) and fixing the other end of the connector to the bottom of the yoke.

3. The method for disassembling a hydro-generator brake in the machine pit according to claim 2, characterized in that: The connector is a rope, strap, or chain.

4. The method for disassembling a hydro-generator brake in the machine pit according to claim 2, characterized in that: The other end of the connector is fixed to the bottom of the yoke, which means that the connector is hung on the lower fan located at the lower end of the yoke or that the connector is engaged with the eye bolt on the mounting hole of the yoke brake ring.

5. The method for disassembling a hydro-generator brake in the machine pit according to claim 1, characterized in that: Step b specifically refers to lifting the rotor (6) by a high-pressure oil lifting device, rotating the rotor (6) by turning the wheel, and stopping the turning wheel when the rotor (6) drives the brake (1) to rotate between the two lower frame support arms (13) of the lower frame (7).

6. The method for disassembling a hydro-generator brake in the machine pit according to claim 5, characterized in that: Specifically, step e refers to adjusting the telescopic outriggers of the outer platform (9) to raise the outer platform (9). When the height of the outer platform (9) is consistent with the height of the stator support (10), the brake (1) is pulled radially outward to pull the brake (1) from the outer platform (9) through the gap between the stator support (11) and the stator support (10) onto the stator support (10), thus completing the disassembly of the brake (1).

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