JP4658382B2 - Pump water wheel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a pump turbine used for hydroelectric power generation.
[0002]
[Prior art]
FIG. 6 shows a conventional pump turbine. In the figure, reference numeral 1 is a runner, 3 is a guide vane, 4 is a guide vane arm, 5 is a link, 6 is a guide ring, 7 is a stay vane, 8 is a speed ring for supporting the stay vane 7 from water pressure, 9 is a casing, A main shaft of the runner 1, 11 is a main bearing, 12 is an upper cover, 13 is a lower cover, and 14 is a suction pipe.
The runner 1 includes a crown plate 1a, a shroud plate 1b, a runner vane 1c, and a runner cone 1d, and a main shaft 10 is fixed to the center of the upper surface of the crown plate 1a. A water channel is formed between the crown plate 1a and the shroud plate 1b, and a plurality of runner vanes 1c are arranged in the water channel.
An upper cover 12 is disposed above the crown plate 1a to cover the crown plate 1a. A lower cover 13 is disposed below the shroud plate 1 b and is fixed to the concrete 15 together with the casing 9.
The lower cover 13 has a structure integrated with the drainage box 20. The drainage box 20 is a device for collecting and discharging water leaking from the guide vane 3 when the pump vane is operated by closing the guide vane 3 when the pump operation is started and pushing down the water surface sufficiently below the runner.
Specifically, the upper plate 21 is provided in an annular shape around the central axis, and the drainage box 20 is provided integrally with the upper plate 21 around the central axis immediately below the upper plate 21. The width of the drainage box 20 is substantially the same as the width of the upper plate 21, and the bottom surface 20 a is supported by the concrete 15. That is, the upper plate 21 is indirectly supported by the concrete 15 via the drainage box 20. The upper plate 21 is provided with a drainage hole (not shown) so that water leaking through the guide vane 3 when the pump is started flows into the drainage box 20 through the hole. In addition, a drainage pipe (not shown) is opened in the drainage box 20 so that water flowing into the drainage box 20 is discharged.
[0003]
[Problems to be solved by the invention]
In the pump turbine configured as described above, the external pressure in the direction of arrow F in the figure is received by the water pressure between the runner 1 and the lower cover 13. For this reason, it is necessary to increase the height of the drainage box 20 to ensure sufficient rigidity, and there is a problem that the lower cover is increased in size.
[0004]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a pump turbine that can reduce the size of the lower cover.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is a pump turbine including a runner and a lower cover that is positioned below the runner and is provided around the rotation axis of the runner. The lower cover includes an upper plate, A gap portion that is provided below the inner diameter side of the upper plate and is filled with concrete, and a drainage box that is provided below the outer periphery side of the upper plate and into which water flows from the runner side , and has an inner circumference of the drainage box The side wall portion is characterized in that the upper diameter forms an inclined surface in sectional view smaller than the lower diameter .
[0006]
In the present invention, since the upper plate of the lower cover is directly supported by the concrete, the rigidity is high. And the wall part of the inner peripheral side of a drainage box is made into the inclined surface which upper direction inclines to a runner rotating shaft side in the cross section by the plane containing a runner rotating shaft. By tilting the inner peripheral side wall so as to be substantially parallel to the external pressure F (see FIG. 6), the rigidity is further increased, and the capacity of the drainage box is secured while maintaining the workability of the piping on the inner diameter side. Is possible.
[0007]
The invention according to claim 2 is characterized in that, in the pump turbine according to claim 1, the wall portion on the outer diameter side of the drainage box is a part of a speed ring located on the outer peripheral side of the runner. To do.
[0008]
In this invention, a part of the speed ring serves as the outer peripheral wall of the drainage box, so that the volume of the drainage box can be increased and ribs can be provided in the box, so that the rigidity can be improved. The painting work inside becomes easy.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
What is shown in FIG. 1 is the Francis type pump-turbine shown as one Embodiment of this invention. In the figure, reference numeral 1 is a runner, 3 is a guide vane, 4 is a guide vane arm, 5 is a link, 6 is a guide ring, 7 is a stay vane, 8 is a speed ring for supporting the stay vane 7 from water pressure, 9 is a casing, The main shaft of the runner 1, 11 is a main bearing, 12 is an upper cover, 30 is a lower cover, and 14 is a suction pipe.
The runner 1 includes a crown plate 1a, a shroud plate 1b, a runner vane 1c, and a runner cone 1d, and a main shaft 10 is fixed to the center of the upper surface of the crown plate 1a. A water channel is formed between the crown plate 1a and the shroud plate 1b, and a plurality of runner vanes 1c are arranged in the water channel.
An upper cover 12 is disposed above the crown plate 1a to cover the crown plate 1a. A lower cover 30 is disposed below the shroud plate 1 b and is fixed to the concrete 15 together with the casing 9.
[0012]
Now, the configuration of the lower cover 30 will be specifically described. 2 is a top view in which a part of the lower cover 30 is broken, FIG. 3 is a sectional side view, and FIG. 4 is a partially enlarged view.
In the figure, reference numeral 31 denotes a baffle plate, and reference numeral 32 denotes a drainage box provided directly below the baffle plate. Specifically, the drainage box 32 includes an inner peripheral wall 33, an outer peripheral wall 34, and a bottom wall 35. The width of the baffle plate 31 is approximately half that of the baffle plate 31, and the baffle plate 31 is provided on the outer side in the radial direction.
The inner peripheral wall 33 of the drainage box 32 forms an inclined surface in cross section when the upper diameter (curvature radius) is smaller than the lower diameter. That is, in the cross section of the plane including the rotation axis of the runner 1, the inner peripheral wall 33 of the drainage box 32 is an inclined surface whose upper side is inclined toward the rotation axis of the runner 1.
A gap 38 of the lower cover 30 is provided inside the baffle plate 31 in the radial direction, and the concrete 15 is filled therein so that the inner diameter side of the baffle plate 31 is directly supported by the concrete 15.
As shown in FIG. 2, the lower cover 30 is configured by fixing two semicircular divided members 30 a and 30 b to each other with the contact surfaces 30 c and 30 d being aligned with each other. Two drainage boxes 32 having a length of less than half a circle are provided independently. The gap 38 is provided over the entire circumference while being partitioned by the rib 40. Since it is desirable that the drainage box 32 has a large volume, the drainage box 32 is configured to be provided over substantially the entire circumference.
[0013]
Further, a drain hole 41 is provided in a part of the baffle plate 31 so that water leaking from the guide vane 3 flows into the drain box 32. Further, a drain pipe 42 is opened at the bottom of the drain box 32 so that water flowing into the drain box 32 is discharged.
Further, as shown in FIG. 4, a runner seal cooling water pipe 45 that cools the runner seal 43 provided between the runner 1 and the lower cover 30 passes through the gap 38 of the lower cover 30. A runner side pressure tube 46 that opens to the inside and detects the side pressure of the runner 1 passes through the gap 38 of the lower cover 30, and is provided with the tip exposed above the baffle plate 31.
The reference numeral 48 in FIGS. 2 and 3 is a priming drain pipe that drains the water that has leaked through the guide vane 3, and penetrates the drain box 32.
[0014]
In the lower cover 30 configured in this manner, the baffle plate 31 is directly supported by the concrete 15, so that sufficient rigidity can be ensured and the lower cover 30 can be downsized.
Further, conventionally, the runner seal cooling water pipe 45 and the runner side pressure pipe 46 have to be attached through the inside of the drainage box 20, so that a person has to enter the drainage box 20 to work, and the work labor is large. In this example, since it can attach through the space | gap part 38 of the lower cover 30 without letting the drainage box 32 pass, it can work easily.
Furthermore, since the inner peripheral wall 33 of the drainage box 32 is inclined, the rigidity can be further increased by being substantially parallel to the external pressure F (see FIG. 6). Moreover, it becomes possible to ensure the capacity | capacitance of the drainage box 32, maintaining the workability of the piping 45 and 46 of an internal diameter side.
[0015]
The baffle plate 31 has a thick plate structure as compared with the conventional one, so that the rigidity can be further increased, the painting work in the drain box 32 is facilitated, and a rib is also provided in the drain box 32. Therefore, rigidity can be improved.
Further, as shown in FIG. 5, the volume of the drainage box 32 is increased by removing the outer peripheral wall of the drainage box 34 (see reference numeral 34 in FIG. 4) and substituting a part of the speed ring 8 with the outer peripheral wall. be able to.
[0016]
【The invention's effect】
As described above, in the pump turbine according to the present invention, since the upper plate of the lower cover is directly supported by concrete, the rigidity can be increased and the size of the lower cover can be reduced. Moreover, since the wall portion on the inner peripheral side of the drainage box has an inclined surface in section when the upper diameter is smaller than the lower diameter, the rigidity is further increased by being substantially parallel to the external pressure. It is possible to secure the capacity of the drainage box while maintaining the workability of the piping (claim 1).
Moreover, the volume of the drainage box can be increased by part of the speed ring serving as the outer peripheral wall of the drainage box (claim 2).
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a pump turbine shown as an embodiment of the present invention.
FIG. 2 is a top view in which a part of a lower cover used in the pump turbine is broken.
FIG. 3 is a side sectional view of the lower cover.
FIG. 4 is an enlarged side cross-sectional view of a part of the lower cover.
FIG. 5 is an enlarged side sectional view of a part of a lower cover of a pump turbine shown as a modification of the present invention.
FIG. 6 is a partial sectional view of a conventional pump turbine.
[Explanation of symbols]
1 Runner 8 Speed ring 30 Lower cover 31 Baffle plate (Upper plate)
32 Drainage box 38 Gap

Claims (2)

In a pump turbine provided with a runner and a lower cover that is positioned below the runner and is annularly provided around the rotation axis of the runner,
The lower cover includes an upper plate, a gap provided below the upper plate on the inner diameter side and filled with concrete, and a drainage box provided below the outer plate on the outer diameter side and into which water flows from the runner side. And the wall portion on the inner peripheral side of the drainage box has an inclined surface in sectional view that has an upper diameter smaller than the lower diameter . The pump turbine according to claim 1,
The pump turbine according to claim 1, wherein the outer peripheral wall of the drainage box is a part of a speed ring located on the outer peripheral side of the runner.

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