JPS6332164A - Hydrauric generator - Google Patents

Abstract

PURPOSE:To aim at reducing manhour and improving safety in a repair work by forming the hydraulic generator in the caption in such a way as enabling a generator shaft separated from a rotor and said generator shaft to be take out upward. CONSTITUTION:When outer diameter of a thrust bearing 9 is assigned to D1, inner diameters of upper and lower franges of a rotor 10 to D2, D4 and outer diameter of a generator shaft 8 D3, they are formed to satisty D4>U3>D2>D1. By removing those bolts for fastening the generator shaft 8 to a hydrauric turbine main shaft 2 and the rotor 10, and further removing a generator cover 17, it is made possible to take out the generator shaft 8 and the thrust bearing 9 upward to secure an in-pit space between the generator and the hydrauric turbine. Next a turbine upper cover 6 and a thrust bearing holder 14 are lifted up, still more the turbine shaft 2 and a runner l are lifted up and held in a bound state, then repair or exchange of severely work parts such as 6A, 6B, 1A-1F, 3A, 3B, 7A, 7B etc. is easy and it is possible to improve safety and workability and to reduce manhour.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention particularly relates to an improvement in a hydroelectric generator that utilizes pressurized water in a mixed flow of earth and sand.

[Prior art]

A conventional generator using pressurized water with a mixed flow of earth and sand will be explained with reference to FIG. In the figure, 1 is a runner.

2 is the water wheel shaft, 3 is the guide vane, 4 is the speed ring,
5 is a spiral casing, 6 is a water turbine upper cover, 7 is a water turbine lower cover, 8 is a generator shaft, and 9 is a thrust bearing. Also,
10 is a rotor, 11 is a stator, 12 is a generator upper shaft, 1
3 is an upper bearing, and 17 is a motor cover. A thrust bearing 9 is directly supported on the upper part of the water turbine cover 6, and a generator shaft 8 is directly connected to the upper part of the thrust bearing 9.
Further, the rotor 10 is connected and the generator upper shaft 12 is attached. That is, the generator shaft 8 is flange-connected to the lower part of the rotor 1o. The guide vane 3 is driven by a servo motor (not shown). Since the generator upper shaft 1.2 has an integral structure with the rotor 10, the rotor 10 must be disassembled and removed in order to move the horizontal upper blade bar 6, runner 1, and water wheel shaft 2 to the upper part. Later, the structure required that the power generation shaft 8 must be taken out upwards.

In the above structure, one power generation is generated by the pressure water flowing from the casing 5 through the speed ring 4 and the guide vane 3 into the runner 1, which rotates the runner 1, drives the generator shaft 8 through the water wheel shaft 2, and generates electricity. machine rotor 10
This is done by rotating. The high-pressure water that rotates the runner 1 may contain a large amount of sediment during floods, or may contain large amounts of sediment throughout the year, as seen in mainland China. Water may flow. Due to this sand-containing water, the parts that come into contact with the flowing water are worn away by the sand and sand, and will wear out over time. In this case, if the materials that make up these parts do not have sufficient wear resistance, or if there is a large amount of earth and sand in the flowing water, or if the earth and sand are constantly flowing, the parts will wear out so much that wear will progress in a short period of time. .

For this reason, the functionality of the water turbine deteriorates, that is, the efficiency decreases and the thrust load increases, so frequent repair work is required.

On the other hand, repair work on the guide vane 3 and cover liner has conventionally been carried out in the installed state in the case of minor damage, but in other cases it is customary to carry out complete disassembly, including the generator. be. In the former case, the work environment is poor, as will be explained later.

There are problems with work efficiency, work reliability, and worker safety. In addition, the latter requires a lot of time and man-hours to fully disassemble, and takes a long time to restore, which reduces the amount of power generated and lowers the equipment operating rate.

As shown in FIG. 2 of the embodiment of the present invention, the parts that have been subject to severe wear have conventionally been located at positions IA to I in the runner 1.
These are the D part and the positions IE, IF, and LH parts. position IE,
IF and IH are the outer circumferential portions facing the fixing portion, and are made into narrow gaps to minimize the outflow of high pressure water from the opposing portions, and are areas where wear is large due to the high flow rate of pressurized water.

Also, the liners 6A, 6B at positions 3A and 3B of the guide vane 3, and at positions facing the runner 1 and guide vane 3 of the upper and lower covers 6-7 of the water turbine.

? The mounting positions A and 7B are also severely worn. For this purpose, a material with high wear resistance is applied to these parts at position I of the runner 1.
A~ID, IE, IF, IH, guide vane 3 position IW
Fill 3A, 3B, liner 6A, 6B, 7A
, 7B are typically provided with removable liner construction for ease of repair or replacement. Since the rotor 10 is integrated with the generator upper shaft 12 as described above, it is necessary to disassemble and carry out the rotor 10 in order to move the water turbine top cover 6, runner 1, and water turbine shaft 2 upward. To avoid this, runner 1, guide vane 3
In many cases, repair work for damaged parts of liners is carried out in the installed state, but in the installed state, internal filling and thermal spraying work deals with the atmosphere, which worsens the working environment and is not desirable from a safety standpoint.
The working layer is difficult to use, resulting in poor workability and inefficiency, and it is difficult to adequately control the quality of repair work. Furthermore, the position IE
.

The liner structure of the IF, IH, liner, 6A, 6B, 7A, and 7B sections cannot be replaced or repaired, so it is necessary to disassemble the generator.

[Problem that the invention seeks to solve]

In the conventional structure, when water turbine parts such as runs and guide vanes wear out and repair work is to be performed, it is not possible to minimize the required parts of the water turbine generator, and the reliability of the work is also uncertain. There are issues such as whether it is sufficient.

The present invention has been made in view of the above situation.

The purpose of the present invention is to provide a hydroelectric generator that improves the working environment when performing repair work on horizontal parts, improves safety and workability, provides work certainty, reduces work man-hours, and shortens power generation outage periods. This is what I did.

[Means for solving problems]

The above purpose is to connect a horizontal shaft to which a runner is fixed, which is supplied with high-pressure water through a volute casing, a speed ring, and a guide vane and driven to rotate once, and a generator shaft which is connected to the upper part of the water wheel shaft and has a rotor fixed to its outer periphery. In what has been established,
This is achieved by the fact that the generator shaft and the rotor are removably fixed and the rotor is held in a predetermined position, and the generator shaft is detached from the rotor so that the generator shaft can be taken out upward. .

[Effect]

As will be described later in the description of the embodiment, first, as shown in FIG. 8. Take out the thrust bearing 9 upward. Next, as shown in FIG. 4, the water turbine cover 6 is lifted up by a crane and held by supports 16 above the water turbine pit 1 as shown. In this state, the liners 6A and 6B can be replaced or repaired, and other parts can be easily repaired. Furthermore, as shown in FIG.
A to ID for each location requiring repair.

IF, LH, 3A, 3B, etc. can be repaired, and when repairing any number of parts, there is a large space, which is a good working environment, which is desirable from a safety standpoint, and allows for easy and reliable repair work. .

〔Example〕

Hereinafter, the hydraulic power generator of the present invention will be described as an example, and the same parts as the conventional ones will be denoted by the same reference numerals, and the explanation of the structure of the same parts will be omitted.
This will be explained using figures. FIG. 1 is a longitudinal sectional view of the main part, and FIG. 2 is an explanatory diagram showing parts that are severely worn and require repair, such as runners and guide vanes. In the figure, reference numeral 14 denotes a support base that supports the weight of the rotating parts of the water turbine and generator and the downward axial thrust load applied by the water turbine runner 1 via bearings 9. 15 is a servo motor that drives the guide vane 3. Then, the outer diameter opening of the thrust bearing 9 (or the outer diameter of the generator 1i111B or the maximum outer diameter of this part, here the outer diameter of the thrust bearing 9) is attached to the generator shaft 8 of the rotor 10. the lower side of the flange,
Upper inner diameter D! , D4. The outer diameter of the attachment part of the rotor 10 of the generator shaft 8 is D3, and the relationship between the dimensions of each diameter is No. 0>D3>
It is formed so that Ox>Di. Therefore, a mounting bolt (not shown) is installed between the water turbine main shaft 2 and the generator shaft 8.
, and also remove the mounting bolts (
(not shown) and the generator cover 17, the generator shaft 8 and thrust bearing 9 can be carried out upwards by a crane, and FIG. 3 is an explanatory view after they have been carried out. Therefore, the connection between the rotor 1o and the generator shaft 8 is released,
By carrying out the generator shaft 8 and the like upward, a space in the pit between the generator and the water turbine can be secured. Incidentally, the space between the upper surface of the water turbine upper cover 6 and the lower surface of the rotor 10 in FIG. 1 has been conventionally provided for maintenance and inspection purposes.

Next, as shown in FIG.
- Lift the bearing support base 14 with a crane and hold this part in the water turbine pit via a suitable support 16. In this state, the liner 6A of the water turbine top cover 6 shown in FIG.
, 6B may be repaired or replaced, and in some cases positions 1A to ID1IE of the Nanna 1 and position 3A of the guide vane 3.

3B may be repaired. Note that 18 is a stem driven by a servo motor 15. Furthermore, as shown in FIG. 5, by lifting the combined state of the water turbine main shaft 2 and the runner 1 with a crane and supporting it with an appropriate support, the positions IF and IH of the outer peripheral surface of the runner 1 and the liner 7B of the water turbine lower cover 7 are removed. can be repaired. Water wheel lower cover 7
This is possible by lifting the guide vane 3 for the liner 7A. Therefore, after removing the generator shaft 8 together with the thrust bearing 9, the water turbine cover 6, support stand 14, etc. are installed directly above the water turbine cover 6 in the space occupied when the thrust bearing 9 and generator shaft 8 are assembled. By lifting and holding it in place, a large space is created that was occupied by the water turbine cover 6 in the assembled state.

Furthermore, the posture of the runner 1 can be changed by lifting the runner 1 and the water wheel shaft 2 as shown in FIG. Therefore, when performing overlay repair or thermal spraying work on the severely worn parts of the runner 1 or guide vane 3, the work tools are easier to use than before, making the work easier and improving work efficiency. Also.

Since work can be carried out in an environment with sufficient ventilation during work, safety is ensured, and the quality of the repair section after work can be ensured.

In addition, the thrust bearing 9 and the support stand 14 are connected to the water turbine cover 6.
Since it is installed on top, the space in the water turbine pit is kept to a minimum for maintenance purposes, and the generator shaft 8 is shortened.
The overall height of the water turbine and generator can be set to the minimum required height according to the specifications of the water turbine, such as output, head, and rotation speed.

In this way, the hydraulic generator ff1fi of this embodiment is formed so that the generator shaft can be separated from the rotor and taken out from above, so there is no need to take out the rotor, and the water turbine cover is installed in the space where the generator shaft is removed when repairing the water turbine parts.

Since the runner can be moved sequentially, it is possible to obtain a work environment that facilitates repair work, and if it is removable, (1) the safety of repair work can be greatly improved;

(2) The use of part-time labor for repair work can be considered more freely than in the past, greatly improving work efficiency and efficiency, significantly reducing the number of work hours, and shortening the outage period of one power plant.

(3) When replacing liners, the work time can be reduced to about 1/10 compared to conventional methods.

(4) As a result of improved work safety and workability, the quality of the repaired part is significantly improved, and the durability of the repaired part can be improved and the repair pitch can be lengthened.

〔Effect of the invention〕

As described above, the hydroelectric generator of the present invention can improve the working environment when repairing water turbine parts, improve safety and workability, ensure work reliability, reduce the number of work hours, and shorten power generation suspension periods. This has the effect of shortening the time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part of an embodiment of the hydroelectric generator of the present invention, Fig. 2 is an explanatory diagram of parts of the water turbine parts in Fig. 1 that are severely worn and need repair, Figs. 3, 4, and 5. The figures are an explanatory view of parts movement during repair of the water turbine parts of the generator shown in Fig. 1, and Fig. 6 is a sectional view of essential parts of the conventional water turbine generator. 1...Runner, 2...-water wheel shaft, 3...Guide vane, 4...Speed ring, 5...Casing, 6
... Water turbine top cover, 8... Generator shaft, 9... Thrust bearing, 10... Rotor.

Claims (1)

[Scope of Claims] 1. A power generation system that includes a water wheel shaft to which a runner is fixed, which is supplied with high-pressure water through a spiral casing, a speed ring, and a guide vane and is rotationally driven, and a rotor connected to the upper part of the water wheel shaft and fixed to the outer periphery. The generator shaft is detachably fixed between the generator shaft and the rotor, and the generator shaft is detachably fixed to the rotor and is detachable from the rotor that is held in a predetermined position. A hydroelectric generator characterized by: 2. A thrust bearing that supports the weight supported by the water turbine shaft and the generator shaft, as well as the vertical axial thrust load generated on the water turbine shaft, and is fixed on the water turbine cover, and a thrust bearing having a diameter larger than the outer diameter of the generator shaft. 2. The hydraulic power generator according to claim 1, further comprising: the rotor having an inner diameter larger than the outer periphery of the thrust bearing formed in the rotor.