Water-turbine generator set maintenance device and method

Abstract

The device comprises a hydraulic assembly and a jacking assembly, the hydraulic assembly comprises two electric hydraulic pumps, hydraulic synchronous valves are arranged at high-pressure oil outlets of the two electric hydraulic pumps, and the jacking assembly comprises two hydraulic jacks, a cross beam and at least two screws. A plurality of holes allowing the screw rods to penetrate through are formed in the cross beam, and an oil outlet of the hydraulic synchronous valve is connected with oil inlets of the two hydraulic jacks respectively; the device further comprises a cushion block, and the cushion block is used for being arranged at the top or the bottom of the hydraulic jack so as to achieve dismounting or mounting of a crank arm or a pin or a guide vane sleeve. According to the water-turbine generator set overhauling device and method, the five functions of pulling out the pin, disassembling the crank arm and the guide vane sleeve and installing the crank arm and the guide vane sleeve are achieved at the same time, and operation is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of maintenance of hydropower stations, and in particular relates to a maintenance device and method for a hydro-generator set. Background Art

[0002] During the maintenance of hydropower stations, pin extraction, disassembly and assembly of crank arms and guide vane sleeves are routine projects. The existing method of pin extraction is usually to cover the pin with a sleeve of appropriate size, insert a screw into the corresponding screw hole of the pin, and the pin is pulled out during the screw tightening process. The disadvantage is that it is not easy to find a sleeve and screw of appropriate size, and the thread of the pin hole is easy to slip.

[0003] The existing method for dismantling the crank arm is to remove it by hydraulic jacking under the crank arm. The disadvantage is that the two hydraulic jacking positions cannot be completely consistent, the lifting height of the two jacks is difficult to control, and the jacking deviation phenomenon is easy to occur, causing wear of the crank arm and the guide vane shaft.

[0004] The existing method for removing the guide vane sleeve is to loosen the sleeve with a jack screw and then lift it away with a ring crane. The disadvantage is that the use of the jack screw can easily damage the position of the top cover corresponding to the jack screw hole, and the jack screw has a limited lifting height, so the guide vane sleeve often cannot be lifted out in one go. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and to propose a maintenance device and method for a hydro-generator set, which can be flexibly applied to pulling out pins, disassembling crank arms and guide vane sleeves, and has a simple structure, is easy to manufacture, and is easy to operate.

[0006] According to a first aspect of the present invention, a device and method for repairing a hydro-turbine generator set are provided, the device comprising a hydraulic assembly and a jacking assembly, the hydraulic assembly comprising two electric hydraulic pumps, the two high-pressure oil outlets of the electric hydraulic pumps being provided with hydraulic synchronization valves, the jacking assembly comprising two hydraulic jacks, a crossbeam and at least two screws, the crossbeam being provided with a plurality of holes for the screws to pass through, the oil outlets of the hydraulic synchronization valves being respectively connected to the oil inlets of the two hydraulic jacks; and the device also comprising a cushion block, the cushion block being used to be arranged at the top or bottom of the hydraulic jack to achieve the removal or installation of a crank arm, a pin or a guide vane sleeve.

[0007] Preferably, the cross beam comprises two vertical plates, a plurality of connecting plates are welded between the two vertical plates, the hole is formed by isolating the plurality of connecting plates and the vertical plates, and a central hole is provided at the central position of the cross beam.

[0008] Preferably, a load balancing valve is connected to the outlet of the electric hydraulic pump.

[0009] Preferably, the cushion block comprises a plurality of cushion blocks, and adaptable bosses are provided between the plurality of cushion blocks so that the plurality of cushion blocks can be axially overlapped or separated.

[0010] Preferably, a pressure gauge is provided at the outlet of the load balancing valve.

[0011] Preferably, it further comprises a shell, the pump body of the electric hydraulic pump is installed in the shell, and the motor of the electric hydraulic pump is installed on the top of the shell.

[0012] A second aspect of the present invention provides a method for repairing a hydro-turbine generator set, wherein the hydro-turbine generator set repair device described in any one of the above items is used to dismantle the pin, crank arm and guide vane sleeve of the hydro-turbine generator set, and to install the crank arm; wherein, when dismantling the crank arm or the guide vane sleeve, the method comprises: Place a hydraulic jack stably on the upper end surface of the guide vane shaft, and place a crossbeam transversely on top of the hydraulic jack; After two screws are symmetrically passed downward through the holes on both sides of the cross beam, the bottom ends of the screws are threadedly connected to the bolt holes on the crank arm or the guide vane sleeve, and nuts and gaskets are connected to the top ends of the screws so that the nuts press the gaskets tightly onto the cross beam; Connect the oil inlet of the hydraulic jack to the oil outlet of the hydraulic synchronization valve of one of the electric hydraulic pumps; Start the electric hydraulic pump to provide hydraulic power to the hydraulic jack, so that the hydraulic jack drives the crank arm to rise together until the crank arm or the guide vane sleeve is removed.

[0013] Preferably, when removing the pin, the process includes: Place two hydraulic jacks stably on the upper end surfaces of the crank arms respectively, and place the crossbeam transversely on the top of the hydraulic jacks; A screw rod is passed downward through the holes on both sides of the cross beam, and the bottom end of the screw rod is threadedly connected with the bolt hole of the pin, and a nut and a gasket are connected to the top end of the screw rod so that the nut presses the gasket tightly onto the cross beam; Connect the oil inlets of the two hydraulic jacks to the two oil outlets of the hydraulic synchronization valve of one of the electric hydraulic pumps; Start the electric hydraulic pump to provide hydraulic power to the hydraulic jack, so that the hydraulic jack drives the pin to rise together until the pin is removed.

[0014] Preferably, when installing the crank arm, it includes: Sleeve the crank arm onto the guide vane shaft; Place two hydraulic jacks stably on the upper end surfaces of the crank arms respectively, and place the crossbeam transversely on the top of the hydraulic jacks; A screw rod is passed downward through the holes on both sides of the cross beam, and the bottom end of the screw rod is threadedly connected with the bolt hole of the pin, and a nut and a gasket are connected to the top end of the screw rod so that the nut presses the gasket tightly onto the cross beam; Connect the oil inlets of the two hydraulic jacks to the two oil outlets of the hydraulic synchronization valve of one of the electric hydraulic pumps respectively; Start the electric hydraulic pump to provide hydraulic power to the hydraulic jack, so that the hydraulic jack presses the crank arm down until the crank arm is installed in place.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a maintenance device and method for a hydro-generator set, which has a simple structure, is easy to manufacture and easy to operate. The oil pump and pipeline in the device can be customized by a mainstream oil pump manufacturing manufacturer; the crossbeams, screws, pads, etc. in the tooling can all be manufactured in an ordinary mechanical processing plant.

[0016] The invention provides a maintenance device and method for a hydro-generator set, which simultaneously has five functions of pulling out pins, removing crank arms and guide vane sleeves, and installing crank arms and guide vane sleeves, and is easy to operate.

[0017] The invention provides a maintenance device and method for a hydro-generator set, which makes the site tidier when used. The use of the device greatly reduces the number of tools used for pulling out pins, disassembling crank arms and guide vane sleeves during maintenance, and the special pads replace the previous pads such as iron plates and ratchet sleeves, which is more conducive to keeping the maintenance site clean and tidy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention.

[0019] Figure 2 for Figure 1 Top view of the .

[0020] Figure 3 It is a structural schematic diagram of the crossbeam in the present invention.

[0021] Figure 4 It is a schematic structural diagram of a cushion block in a preferred embodiment of the present invention.

[0022] Figure 5 for Figure 4 CC section view.

[0023] Figure 6 The figure is a schematic diagram of the implementation status of a preferred embodiment of the present invention.

[0024] In the above drawings: 10. Hydraulic assembly; 11. Electric hydraulic pump; 12. Hydraulic synchronization valve; 13. Load balancing valve; 14. Pressure gauge; 20. Lifting assembly; 21. Hydraulic jack; 22. Crossbeam; 221. Vertical plate; 222. Connecting plate; 223. Center hole; 23. Screw; 24. Hole; 30. Spacer; 31. Boss; A. Guide vane shaft; B. Crank arm; D. Pin. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] As a preferred embodiment of the present invention, this embodiment provides a maintenance device for a hydro-generator set, such as Figure 1-Figure 5 As shown, it includes a hydraulic component 10 and a jacking component 20, the hydraulic component 10 includes two electric hydraulic pumps 11, the outlets of the two electric hydraulic pumps 11 are connected to the hydraulic synchronization valve 12, the jacking component 20 includes two hydraulic jacks 21, a crossbeam 22 and at least two screws 23, the crossbeam 22 is provided with a plurality of holes 24 for the screws 23 to pass through, the two oil outlets of the hydraulic synchronization valve 12 are respectively connected to the oil inlets of the two hydraulic jacks 21; it also includes a cushion block 30, the cushion block 30 is used to be arranged on the top or bottom of the hydraulic jack 21 to realize the removal or installation of the crank arm, pin or guide vane sleeve.

[0027] Specifically, Figure 3 As shown, the cross beam 22 includes two vertical plates 221, and a plurality of connecting plates 222 are welded between the two vertical plates 221. The hole 24 is separated by a plurality of connecting plates 222 and the vertical plates 221. A center hole 223 is provided at the center position of the cross beam 22 to facilitate the removal or installation of crank arms, guide vane sleeves and pins of different widths, mainly to facilitate the adjustment of the connection position of the screw.

[0028] In some preferred embodiments, Figure 1 As shown, in order to ensure load balance and make the two electric hydraulic pumps 11 work synchronously when working together, a load balancing valve 13 is connected to the outlet of the electric hydraulic pump 11 in this embodiment.

[0029] In other embodiments, Figure 4 and Figure 5As shown, the cushion block 30 includes a plurality of cushion blocks, and an adaptable boss 31 is provided between the plurality of cushion blocks 30 so that the plurality of cushion blocks can be axially overlapped or separated, thereby adjusting the required cushion height to achieve the purpose of rapid operation.

[0030] In other embodiments, Figure 1 As shown, based on the above embodiment, this embodiment provides a pressure gauge 14 at the outlet of the load balancing valve 13, so as to facilitate observation of the hydraulic system status during operation, assessment of operation risks, and judgment and guidance of subsequent operations.

[0031] In other embodiments, Figure 1 As shown, it also includes a housing 15, the pump body of the electric hydraulic pump 11 is installed in the housing 145, and the motor of the electric hydraulic pump 11 is installed on the top of the housing 15 to facilitate the heat dissipation of the motor.

[0032] As another preferred embodiment of the present invention, this embodiment provides a method for repairing a hydro-turbine generator set, the main point of which is to use a hydro-turbine generator set repair device as described in any one of the above items to dismantle the pins, crank arms and guide vane sleeves of the hydro-turbine generator set, and to install the crank arms; wherein, with reference to Figure 1 , when removing the crank arm or guide vane sleeve, including: Place a hydraulic jack 21 stably on the upper end surface of the guide vane shaft A, and place a crossbeam 22 transversely on the top of the hydraulic jack 21; After two screw rods 23 are symmetrically passed downward through the holes 24 on both sides of the cross beam 22, the bottom ends of the screw rods 23 are threadedly connected with the bolt holes on the crank arm B or the guide vane sleeve, and the nuts and gaskets are connected to the top ends of the screw rods 23 so that the nuts press the gaskets tightly onto the cross beam 22; Connect the oil inlet of the hydraulic jack 21 to the oil outlet of the hydraulic synchronization valve 12 of one of the electric hydraulic pumps 11; The electric hydraulic pump 11 is started to provide hydraulic power to the hydraulic jack 21, so that the hydraulic jack 21 drives the crank arm B to rise together until the crank arm B or the guide vane sleeve is removed. In this process, the guide vane shaft A provides a reaction force.

[0033] Different from the above embodiment, Figure 6 As shown, when removing pin D, it includes: Place two hydraulic jacks 21 stably on the upper end surfaces of the crank arms B respectively, and place the crossbeam 22 transversely on the top of the hydraulic jacks 21; A screw rod 23 is passed downward through the holes 24 on both sides of the cross beam, and the bottom end of the screw rod 23 is threadedly connected with the bolt hole of the pin, and a nut and a gasket are connected to the top end of the screw rod 23 so that the nut presses the gasket onto the cross beam 22; Connect the oil inlets of the two hydraulic jacks 21 to the two oil outlets of the hydraulic synchronization valve 12 of one of the electric hydraulic pumps 11 respectively; The electric hydraulic pump 11 is started to provide hydraulic power to the hydraulic jack, so that the hydraulic jack 21 drives the pin D to rise together until the pin D is removed. During this process, the crank arm B provides a reaction force.

[0034] Different from the above embodiment, Figure 1 , when installing the crank arm, include: Sleeve the crank arm B onto the guide vane shaft A; Place two hydraulic jacks 21 stably on the upper end surface of the crank arm B respectively, and place the crossbeam 22 horizontally on the top of the hydraulic jacks 21; A screw rod 23 is passed downward through the holes 24 on both sides of the cross beam 22, and the bottom end of the screw rod 23 is threadedly connected with the bolt hole of the pin D, and a nut and a gasket are connected to the top end of the screw rod 23, so that the nut presses the gasket onto the cross beam 22; Connect the oil inlets of the two hydraulic jacks 21 to the two oil outlets of the hydraulic synchronization valve 12 of one of the electric hydraulic pumps 11 respectively; The electric hydraulic pump 11 is started to provide hydraulic power to the hydraulic jack 21, so that the hydraulic jack 21 presses down the crank arm B until the crank arm B is installed in place. In this process, the pin provides a reaction force.

[0035] The disassembly and assembly process of the guide vane sleeve is exactly the same as that of the crank arm. Since the screw hole spacing of the guide vane sleeve is larger than that of the crank arm, you can use the outermost side hole of the beam to insert the screw.

[0036] It can be understood that the present invention has at least three working modes, that is, multiple usage modes, and the maintenance site is not limited to a certain working mode, but is flexibly adjusted according to the construction environment. The following is a specific introduction in conjunction with Table 1: Mode ①: An electric hydraulic pump drives one or two hydraulic jacks; Mode ②: Two electric hydraulic pumps drive one or two hydraulic jacks simultaneously; Mode ③: A single electric hydraulic pump drives a large-capacity hydraulic jack respectively, and synchronous lifting and lowering are achieved through a load balancing valve. This working mode is shown in the attached figure.

[0037] The scenarios in which each working mode is applicable and the advantages of each working mode are shown in Table 1:

[0038] Table 1 Working mode table Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A hydro-generator maintenance device and method, Features: The device includes a hydraulic component and a jacking component. The hydraulic component includes two electric hydraulic pumps. Hydraulic synchronization valves are set at the high-pressure oil outlets of the two electric hydraulic pumps. The jacking component includes two hydraulic jacks, a crossbeam and at least two screws. The crossbeam is provided with a plurality of holes for the screws to pass through. The oil outlets of the two hydraulic synchronization valves are respectively connected to the oil inlets of the two hydraulic jacks. The device also includes a cushion block, which is used to be set at the top or bottom of the hydraulic jack to realize the removal or installation of the crank arm, pin or guide vane sleeve.

2. A hydro-generator maintenance device according to claim 1, Features: The crossbeam comprises two vertical plates, a plurality of connecting plates are welded between the two vertical plates, the hole is formed by isolating the plurality of connecting plates and the vertical plates, and a central hole is provided at the central position of the crossbeam.

3. A hydro-generator maintenance device according to claim 1, Features: The outlet of the electric hydraulic pump is connected with a load balancing valve.

4. A hydro-generator maintenance device according to claim 1, Features: The cushion block comprises a plurality of cushion blocks, and matching bosses are arranged between the cushion blocks so that the cushion blocks can be axially overlapped or separated.

5. A hydro-generator maintenance device according to claim 3, Features: The outlet of the load balancing valve is provided with a pressure gauge.

6. A hydro-generator maintenance device according to claim 1, Features: It also includes a shell, the pump body of the electric hydraulic pump is installed in the shell, and the motor of the electric hydraulic pump is installed on the top of the shell.

7. A method for repairing a hydro-generator set. Features: The maintenance device for a hydro-generator set according to any one of claims 1 to 6 is used to dismantle the pins, crank arms and guide vane sleeves of the hydro-generator set, and to install the crank arms; wherein, when dismantling the crank arms or guide vane sleeves, the device comprises: Place a hydraulic jack stably on the upper end surface of the guide vane shaft, and place a crossbeam transversely on top of the hydraulic jack; After two screws are symmetrically passed downward through the holes on both sides of the cross beam, the bottom ends of the screws are threadedly connected to the bolt holes on the crank arm or the guide vane sleeve, and nuts and gaskets are connected to the top ends of the screws so that the nuts press the gaskets tightly onto the cross beam; Connect the oil inlet of the hydraulic jack to the oil outlet of the hydraulic synchronization valve of one of the electric hydraulic pumps; Start the electric hydraulic pump to provide hydraulic power to the hydraulic jack, so that the hydraulic jack drives the crank arm to rise together until the crank arm or the guide vane sleeve is removed.

8. A method for repairing a hydro-generator set according to claim 7, Features: When removing the pin, include: Place two hydraulic jacks stably on the upper end surfaces of the crank arms respectively, and place the crossbeam transversely on the top of the hydraulic jacks; A screw rod is passed downward through the holes on both sides of the cross beam, and the bottom end of the screw rod is threadedly connected with the bolt hole of the pin, and a nut and a gasket are connected to the top end of the screw rod so that the nut presses the gasket tightly onto the cross beam; Connect the oil inlets of the two hydraulic jacks to the two oil outlets of the hydraulic synchronization valve of one of the electric hydraulic pumps respectively; Start the electric hydraulic pump to provide hydraulic power to the hydraulic jack, so that the hydraulic jack drives the pin to rise together until the pin is removed.

9. A method for repairing a hydro-generator set according to claim 7, Features: When installing the crank arm, include: Sleeve the crank arm onto the guide vane shaft; Place two hydraulic jacks stably on the upper end surfaces of the crank arms respectively, and place the crossbeam transversely on the top of the hydraulic jacks; A screw rod is passed downward through the holes on both sides of the cross beam, and the bottom end of the screw rod is threadedly connected with the bolt hole of the pin, and a nut and a gasket are connected to the top end of the screw rod so that the nut presses the gasket tightly onto the cross beam; Connect the oil inlets of the two hydraulic jacks to the two oil outlets of the hydraulic synchronization valve of one of the electric hydraulic pumps respectively; Start the electric hydraulic pump to provide hydraulic power to the hydraulic jack, so that the hydraulic jack presses the crank arm down until the crank arm is installed in place.

Images