JPS6038555B2 - Water turbine top cover - disassembly and assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for disassembling and assembling an upper cover inserted into a bit liner of a water turbine.

[Prior art and its problems] In general, in high-speed rotating water turbines, the upper part of the water turbine bit liner must be made much smaller than the maximum outer diameter of the upper cover due to the requirements of the generator or generator motor. When disassembling and reassembling the parts, the parts of the generator or the upper cover are separated and passed through the upper part of the bit liner whose closing part is narrowed.

Particularly when disassembling and reassembling the upper cover, the upper cover is divided into four parts and each of the quarter pieces is lifted one by one using a crane and inserted into the bit liner or taken out from the pit liner.

That is, in FIG. 1, the upper cover 2 is inserted into the bit liner 1, the flange 2a of the upper cover 2 is stretched over the speed ring 3, the upper part la of the bit liner is narrowed, and the upper cover 2 is inserted into the bit liner 1. The inner diameter of la is set smaller than the maximum diameter of the upper cover.

As shown in FIGS. 2 and 3, the upper cover 2 is divided into four parts during disassembly and assembly, and each divided piece 2b is attached one by one onto the wires 4, 4 and the divided piece 2b using a crane. It was intended to be lifted up via eye bolts 5, 5. Moreover, partition walls 2c, 2c are provided at the portions where the divided pieces 2b are joined to each other, and these partition walls 2
Bolt holes 2d, 2d, .

However, when disassembling and reassembling the upper cover 2 in this way,
When divided, not only does it take a long time to operate the bolts to connect and separate the divided pieces 2b, but it is also very difficult to operate the bolts in a narrow water turbine bit.

Furthermore, since there are many divisions, it takes a long time to suspend the division pieces 2b, and the manufacturing cost of the upper cover itself increases. [
OBJECTS OF THE INVENTION] In view of the above-mentioned points, an object of the present invention is to provide a method for disassembling and assembling an upper cover of a water turbine, which can improve work efficiency when disassembling and assembling the upper cover.

[Summary and operation of the invention]

The purpose of this is to provide a method for disassembling and assembling an upper cover whose diameter is larger than the inner diameter of the upper part of the water turbine bit liner. Suspended at a point near the outer periphery of the top surface of the half on a line passing through the center of gravity and almost parallel to the dividing line of the top cover,
Next, by changing the relative height position between the center of gravity position and a point near the outer periphery, the half piece is tilted about the upper cover diameter line perpendicular to the parting line, and the half piece is made to pass over the upper part of the water turbine bit liner. be done.

That is, when disassembling and assembling, first separate the upper cover 2 into two halves h', and remove the metal fitting 10 at the center of gravity of one half h'.
The half piece h is pulled up at the position of the metal fitting 16 which is located near the outer periphery of the half piece and directly above the parting line passing through the center of gravity. At this time, the upper cover half piece h is tilted with the diameter line Y perpendicular to the dividing line as the center of rotation. In this way, the upper cover half piece h can be tilted in a stable posture, and can be tilted while the plane projected diameter is reduced, and the number of divisions can be reduced to improve work efficiency. [Embodiments] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 4 to 11.

In FIGS. 4 and 5, the upper cover 2 is divided into two parts, and its half h is tilted until its planar projection ridge (FIG. 5) becomes smaller than the diameter of the upper part la of the bit liner. It is allowed to pass through the upper part la of the pick-up liner in an inclined state.

Each of the half pieces h of the upper cover is shown in FIGS. 6 and 7.
As shown in the figure, the upper cover hanging bracket 10 is fixed approximately at the center of gravity, and the upper cover hanging bracket 10 is fixed to the boss portion 2e of the upper cover with bolts 11, 11...11. A plate 12, support plates 13, 13 fixed to the mounting plate 12 at a distance and extending vertically upward; a pin 14 constructed between the support plates 13; and a collar 15 rotatably attached to the pin 14. is on. If the dividing line of the cover 2 is the X-axis and the diameter line orthogonal to the X-axis is the Y-axis, the upper cover hanging bracket 10 is installed on the Y-axis, and the pin 14 and collar 15 are attached to the Y-axis. Mounted in the same direction. On the other hand, on the top of the top cover,
In addition, an eye bolt 16 is fixed to a position near the outer periphery on a straight line passing through the center of gravity and substantially parallel to the dividing line, and a chain block 17 is hooked to the eye bolt 16 as shown in FIG. A wire 19 from a crane hook 18 is hooked onto the collar 15 of No. 10.

Incidentally, the upper cover hanging fitting 10 may directly attach the support plates 13, 13 onto the boss portion 2e without using the mounting plate 12.

Next, the effect will be explained.

Wire-1 is attached to the crane hook 18 suspended from the crane.
9 and one end of the chain of the chain block 17, hook the end of the wire 19 to the collar 15 of the upper cover hanging bracket 10, and then, with the chain loosened, hook the other end of the chain of the chain block 17. Hook it onto the eye bolt 16 above.

Thereafter, the crane hook 18 is raised to lift the upper cover half h, and the chain of the chain block 17 is pulled to bring the eye bolt 16 closer to the crane hook 18, thereby tilting the half h. The upper cover hanging fitting 10 is installed at the zero weight position of the half piece h, and the wire 19 is hooked to the pin 14 via the collar 16, so the upper cover is suspended at the - point and the load applied to the chain flock 17 is small. Moreover, the tilting of the half piece h about the Y axis is smoothly carried out by the action of the collar 15. In addition, since the center of gravity of the half piece h is suspended, the half piece h can be held above the speed ring 3 in a horizontal state with one wire 19, and it can be raised or lowered in a horizontal state. In addition, the periphery of the half piece h will not collide with or be rubbed against the inner surface of the speed ring 3 during assembly and descent. Furthermore, when working on the forehead of the half h in the bit liner 1, the tilting is only done around the Y axis, but not around the line connecting the hanging bracket 10 and the eye vault 16, making the tilting operation easy. be.
In this way, by dividing the upper cover into two parts and disassembling and reassembling each half by operating each half, the number of partition plates 2c and bolts for connecting the divided pieces can be saved compared to the conventional four-part method, which reduces production costs. It is possible to reduce this and also prevent a decrease in strength due to multiple divisions. In addition, since disassembly and assembly work can be completed in a short time, it is advantageous even when overhauling an existing power plant because the power supply outage period can be shortened. Please note that there are cases where the top cover has to be divided into four parts due to transportation problems, but in this case, it is difficult to insert the top cover into the bit liner or take it out from the bit liner.
It may be carried out in a divided state and handled in four parts during transportation.

In addition, when dividing into four parts, if each divided piece is to be hung, it is also possible to pass a wire through the bolt hole 2d of the partition plate 2c. [Effect] As explained above, the present invention provides a method for disassembling and assembling an upper cover whose diameter is larger than the inner diameter of the upper part of a water turbine bit liner. Suspend it at approximately the center of gravity on its top surface and a point near the outer periphery of the top surface of the half on a line that passes through the center of gravity and is almost parallel to the dividing line of the upper cover, then change the relative height position between the center of gravity and a point near the outer periphery. By tilting the half piece about the upper cover diameter line perpendicular to the parting line so that it passes over the upper part of the water turbine bit liner, it is possible to not only reduce the plane projection when the half piece is tilted, but also With a single wire, the half of the upper cover can be attached to the speed ring in a horizontal position and removed from there, so there is no need to damage the half by colliding with or rubbing against the inner surface of the speed ring during disassembly and reassembly. There is no.

In addition, even when tilting the half piece from the horizontal position, it is only necessary to operate one chain flock, so the work is smooth, which not only improves the efficiency of disassembling and assembling the upper cover, but also This has the effect that the manufacturing cost of the cover can be reduced.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the vicinity of the bit liner, Figures 2 and 3.
The figure is an explanatory diagram of a conventional four-part disassembly and assembly method, Figures 4 and 5 are explanatory diagrams of a two-division disassembly and assembly method of the present invention, Figure 6 is a plan view of a half piece of the upper cover, and Figure 7 is an illustration of the upper cover hanging. A plan view of the metal fittings, and FIG. 8 is a front view of the upper cover half piece when hanging at an angle. 1...Bit liner, 2...Top cover, 3...Speed ring, 10...Top cover hanging bracket, 14...Piso, 1
5... Collar, 17... Chain frock, 18... Crane hook. Multi-1 figure multi-2 Kaede multi-3 wing multi-4 figure ○ Kaedechin 6 figure multi-7 box multi-figure 8

Claims (1)

[Claims] 1. In a method of disassembling and assembling an upper cover whose diameter is larger than the inner diameter of the upper part of a water turbine pit liner, the upper cover is divided into two parts at the time of disassembling and reassembling the upper cover, and one half of the upper cover is placed approximately at the center of gravity on the upper surface, and the other half is placed at approximately the center of gravity on the upper surface of the upper cover. Suspend the upper cover at a point near the outer periphery of the upper surface of the half on a line almost parallel to the dividing line of the cover, and then change the relative height position between the center of gravity and the point near the outer periphery to set the upper cover diameter perpendicular to the dividing line. A method for disassembling and assembling a water turbine upper cover, which is tilted around a line and passed through the upper part of the water turbine pit liner.