JPS624701Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air exhaust device for pushing down the water surface of a pump-turbine, and in particular, the exhausting of the air pushing down the water surface is
This invention relates to an air exhaust device for pushing down the water surface of a pump-turbine that is not obstructed by drainage from the main shaft seat.

Generally, when starting a pump, the water level in the runner chamber is pushed down with compressed air to reduce the resistance of the runner and the starting load on the drive machine, and after startup, the air in the runner chamber is exhausted. Start pump operation while For this reason, as shown in FIG. 1, for example, a pump turbine includes a flow hole 3 penetrating the main shaft 2, a chamber 6 formed at the base of the main shaft 2, and a shelf member 9 provided within the chamber 6.
It is provided with a small chamber 12 divided by a water surface and an air exhaust device for pushing down the water surface and having an exhaust pipe 8 opening into the small chamber 12.

On the other hand, fresh water is supplied to the gap between the main shaft 2 and the main transfer seat 4 via a water supply pipe 11 for the purpose of cooling and preventing the intrusion of turbid water. After achieving its purpose, this fresh water is discharged to the outside along the main axis, and the water discharged downward falls into the chamber 6. However, when the water surface is pushed down and the air is discharged, there is a risk that the air will be agitated and blown away by the air ejected from the flow holes 3 and will remain in the small chamber 12, blocking the inner end opening 7 of the exhaust pipe and making it impossible to exhaust. be.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a water surface pressing air exhaust device for a pump water turbine, which eliminates the above-mentioned disadvantages and does not cause the possibility that the exhaust of the water surface pressing air is obstructed by drainage from the main shaft seat.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, the reference numeral 1 indicates a runner, and the reference numeral 2 indicates a main shaft. At the base of the main shaft 2, there is a communication hole that passes through the main shaft and communicates the center of the runner 1 with the outer space of the main shaft 2. 3 is drilled.
The outer opening of this flow hole 3 faces an annular chamber 6 defined by the base of the main shaft 2, the main shaft seat 4, and the inner cylindrical portion of the upper cover 5, and this chamber 6 also includes a , the inner end 7 of the deeply inserted exhaust pipe 8 is open.

Furthermore, an annular shelf member 9 is provided within the chamber 6 to divide the chamber into vertical sections. This shelf member 9 allows water that fills the gap between the runner 1 and the upper cover 5 from the outer periphery due to the centrifugal force caused by the rotation of the runner 1 to enter the chamber 6 and block the exhaust pipe 8, making it impossible to exhaust the water. Alternatively, in order to prevent this from becoming difficult, a small chamber 12 is provided to cover the inner end opening of the exhaust pipe from below, and a small chamber 12 is formed between this shelf member 9 and a gutter member 13, which will be described next. ing. Note that a certain gap is maintained between the inner circumferential edge of the shelf member 9 and the main shaft 2, which serves as an exhaust passage, so that the air that presses down the water surface can escape to the exhaust pipe 8 through this gap. It's summery.

An annular gutter member 13 forming the ceiling of the small chamber 12 is provided in the chamber 6 between the shelf member 9 and the main shaft seat 4. The gutter member 13 has a substantially J-shaped cross-sectional shape, for example, and is open toward the main shaft side, and is formed integrally with the shelf member 9 in the illustrated embodiment.

Further, at least one exhaust pipe 14 is provided vertically passing through the gutter member 13 and the shelf member 9.

On the other hand, an annular drainer 1 is provided on the outer peripheral surface of the main shaft 2 between the gutter member 13 and the lower surface of the main shaft seat 4.
5 are integrally installed. The outer circumferential edge of the drainer 15 extends beyond the inner circumferential ring bank of the gutter member 13 to the center of the gutter member 13. In addition, in FIG. 2, the reference numeral 10 indicates a coupling cover.

In the pump-turbine according to the embodiment of the present invention configured as described above, when the water surface is pushed down from the state where the water surface is pushed down at startup and the air is exhausted, the compressed air flows through the circulation hole 3, the chamber 6, the shelf member 9, and the gutter member. 13 through the annular opening between the small chamber 12
The gas flows into the interior and is further exhausted to the outside through the exhaust pipe 8.

At this time, from the water supply pipe 11 to the main spindle 2 and the main spindle seat 4
The fresh water supplied to the gap between the main shaft 2 and flowing down in the direction of the chamber 6 is prevented from flowing down by the drainer 15, and is blown outward by the centrifugal force caused by the rotation of the main shaft 2. The water is bounced off the inner side surface of the gutter member 13 or flows down along the inner side surface of the gutter member 13 and falls into the gutter portion of the gutter member 13. Then, it flows down into the chamber 6 through the drain pipe 14.

As is clear from the above description, the present invention provides a gutter member above the small chamber in which the inner end of the exhaust pipe opens, and at least one drain pipe passing through the gutter member and the shelf member. , an annular drainer is integrally attached to the outer circumferential surface of the spindle between the gutter member and the spindle filler seat, and fresh water supplied between the spindle and the spindle filler seat is shaken off to the gutter member by the drainer. Since the water is allowed to fall into the chamber through the drain pipe, the fresh water supplied between the main spindle and the main spindle seat can enter the small chamber and open the exhaust pipe without causing any hindrance to the water surface being pushed down and the air being exhausted. This has the effect of completely preventing blockage.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a conventional pump-turbine water surface pressing down air exhaust device, and FIG. 2 is a cross-sectional view of a pump-turbine water surface pressing down air exhaust device according to an embodiment of the present invention. 1...Runner, 2...Main shaft, 3...Flow hole, 4
... Main shaft seat, 5 ... Upper cover, 6 ... Chamber, 7 ... Inner end opening, 8 ... Exhaust pipe, 11 ... Water supply pipe, 12 ... Small chamber, 13 ... Gutter member, 1
4...Drain pipe, 15...Drainer.

Claims (1)

[Claim for Utility Model Registration] An annular chamber is formed on the outer periphery of the base of the spindle by the spindle seat and the upper cover, and air that presses down the water surface in the runner chamber is guided into this chamber and discharged to the outside through an exhaust pipe. At the same time, an exhaust passage is formed between the outer peripheral surface of the main shaft and a shelf member is provided below the open end of the exhaust pipe, and a small chamber is divided into the upper part of the chamber. In the apparatus: An annular gutter member that opens toward the main shaft and forms a ceiling of the small chamber is provided between the shelf member and the lower surface of the main shaft holder, and at least one gutter member that passes through the gutter member and the shelf member. An air exhaust device for pushing down the water surface of a pump water turbine, characterized in that a drain pipe is provided, and an annular drainer is integrally attached to the outer circumferential surface of the main shaft between the gutter member and the lower surface of the main shaft seat.