JPS6017950B2 - Water wheel and pump water wheel top cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water turbine and a pump water turbine upper cover, and particularly to facilitate replacement of a guide vane sealing device.
Related to upper covers of water turbines and pump water turbines equipped with manholes.

In general, in pump turbines and water turbines that perform phase adjustment operation, the guide vanes are often fully closed and idle startup is performed when starting the pump or phase adjustment operation, so it is important to maintain the sealing performance of the guide vane sealing device. It is.

This sealing device is usually made of an elastic material such as rubber or a soft metal such as gunmetal, so it is susceptible to wear and tear due to long-term use.
The sealing performance is easily deteriorated due to damage by sand, foreign matter, etc., and therefore, the sealing device needs to be replaced frequently. In such cases, in hydraulic turbines and pump turbines with a secondary structure, the speed ring gradually expands in height from the inlet of the guide vane to the connection of the casing, so when replacing the sealing device, , workers could approach the sealing device from inside the spiral casing and secure a work space for replacing and repairing the sealing device.

However, as shown in Fig. 1, modern speed rings consist of two annular plates 1, 1, which are arranged vertically facing each other at a certain distance apart and have increased rigidity with ribs. , a plurality of stevens 2, 2, . . . fixed between them.・・・．・・・． ... 2, the height 11 between the flow paths is constant from the inner circumference to the outer circumference (almost the same dimension as the blade length of the guide vane), and therefore, In the case where the distance is small, it is difficult to replace or repair the sealing device of the guide vane from inside the spiral casing as in the conventional method.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an upper cover for a water turbine and a pump-turbine, which allows an operator to easily enter and exit from the upper cover side of the water turbine and pump-turbine to replace and repair the sealing device of the guide vane. With the goal.

Therefore, in order to achieve the above object, the present invention includes an upper cover that can be lifted inside the bit, a manhole formed in the upper cover and having a size that allows a worker to enter and exit the runner chamber, and a manhole that, under normal conditions, When inspecting and repairing the guide vane sealing device, the upper cover is lifted up, the cover is removed, and a worker enters the runner chamber through the manhole and enters the guide vane sealing device. This allows for inspection and repair to be carried out close to the vehicle.

Hereinafter, embodiments of a water turbine and an upper force bar for a pump-turbine according to the present invention will be described with reference to the drawings.

In FIG. 1, the spiral casing 3 has its closed end directly abutted against the outer surface of the annular plates 1, 1, and is welded together by welding the abutting portions.

Moreover, inside the stay vanes 2, 2, . . . , 2, a plurality of guide vanes 4, 4, .
・, 4 are arranged along the same circumference as usual,
These guide vanes 4, 4, ......, 4 are
Those spindle shafts are connected to the upper cover 5 and the lower force bar 61.
Thus, it is rotatably supported, and by rotating the guide vane spindle 7, the guide vane opening degree can be adjusted. Further, a lamp chamber 8 is formed between the upper cover 5 and the lower cover 6, and a runner 9 is installed in this runner chamber 8.
Rotationally driven by 0.

Guide vane seals 11, 11 are provided at the portions where the end surfaces of the guide vanes 4 approach the upper cover 5 and the lower cover 6.
is provided, and when the guide vane 4 is fully opened, the pressure water inside the spiral casing 3 flows into the guide vane 4 and the covers 5, 6.
It is designed to prevent leakage into the runner chamber 8 through the gaps.

The guide vane seals 11, 11 are usually made of an elastic material such as rubber or a metal such as gun metal. A circular manhole 12, which is large enough to allow a worker to enter and exit, is closed at a position close to the outer periphery of the runner in the cover 5. The shape of this manhole 12 does not need to be limited to a circle, but its size may be large enough for one worker to enter and exit. The manhole 12 is normally closed watertight by a cover 13 and is removed only when the guide vane seal is replaced or repaired.

The cover body 13 is attached to the manhole 12 in a watertight manner with an appropriate sealing member interposed therebetween, and furthermore, the cover body 13
It is important that the inner end surface of the upper cover 5 and the inner surface of the upper cover 5 are coplanar and flat. The reason for this is to prevent turbulence in the flowing water and prevent cavitation and abnormal vibrations from occurring. In this way, by providing the manhole 12 and the removable lid 13 that closes the manhole on the upper cover 5 of the water turbine and pump water turbine, the water turbine components located above the upper cover can be disassembled and carried out of the bit. Simply put the top cover in a bit as shown in Figure 2, without
In the lifted state, a worker can descend into the runner room 8 through the manhole 12, and the worker can approach the sealing device of the guide vane to replace or repair the sealing device.

Note that as for devices such as hanging bolts for keeping the upper cover 5 suspended inside the bit, conventionally installed devices may be used as they are.

The inner peripheral end of the upper cover 5 in the above magazine terminates close to the water turbine main shaft 10, and the radial distance L from the outer peripheral surface of the main shaft 10 to the inner peripheral end of the upper cover 5 in FIG. By securing at least 100 ft of space, when the upper cover 5 is lifted slightly upward within the bit, a space can be secured between the main shaft 10 and the upper cover 5 through which a worker can enter and exit. As is clear from the above description, according to the present invention, a manhole is provided in the upper cover of the water turbine and the pump water turbine, so that the worker can enter and exit through the manhole when inspecting and repairing the seal layer of the guide vane. It is possible to enter the runner room for inspection and repair, and there is no need to disassemble the generator and the water turbine components above the top cover and carry them out of the bit, reducing the time required to replace the sealing device. The outage period can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a pump-turbine equipped with an upper cover according to the present invention, and FIG. 2 is a half-sectional view of the pump-turbine with the upper cover lifted inside the bit. 5... Upper cover, 12... Manhole, 13... Lid body. Multi 1 drawing Multi 2 drawing

Claims (1)

[Claims] 1 Equipped with an upper cover that can be lifted in the pit, a manhole formed in the upper cover and large enough to allow workers to enter and exit the runner chamber, and a lid body that normally closes the manhole in a watertight manner. Top cover for water turbines and pump water turbines.