JPS633433Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a foreign matter guiding device for a water turbine, and is an improvement that guides foreign matter mixed into the water to a fixed location in the water turbine.

If foreign objects such as plates, twigs, or rocks get mixed in with the water supplied to the water turbine, the guide vane type cross-flow turbine shown in Figure 1 is conventionally equipped with a A water guide member 1 which can be opened and closed and a guide vane 2 which can also be opened and closed are provided in a casing 4. That is, when the foreign matter 8 that has entered is caught between the guide vane 2 and the runner 3, the guide vane 2 opens in the direction of arrow A, and the foreign matter 8 is also trapped.
When the foreign matter 8 is caught between the runner 3 and the water guide member 1, the water guide member 1 opens in the direction of arrow B, and in either case, the structure is such that the foreign matter 8 flows out without damaging the runner 3, etc. ing. That is, the water guide member 1 extends from the casing 4 to near the runner 3, but is separate from the casing 4, and is attached to the casing 4 by a pin so that it can be opened and closed. Further, the water guiding member 1 is given a pushing force in the direction of the runner 3 by a spring, and the spring force always pushes the tip of the water guiding member 1 close to the runner 3 against the water pressure to eliminate loss. When the foreign object 8 comes, the pushing force of the foreign object 8 overcomes the spring force and returns the water guide member 1 in the direction B, allowing the foreign object 8 to pass through. However, in commonly used cross-flow water turbines, the runner 3 is often long in the direction of the runner axis 9, and providing devices that perform the above operations over the entirety would make the device larger and more complicated. This is not very preferable because it may cause problems and require a lot of processing time.

In order to correct this inconvenience, the present invention has a simple structure and achieves the above-mentioned functions by installing these devices at certain locations and guiding the foreign matter 8 that has flowed in with water only there. The purpose of the present invention is to provide a foreign matter guiding device for a water turbine that can be used in water turbines. In a water turbine equipped with a casing, the runner is supported by the casing at a position downstream of the guide vane so as to be able to approach and move away from the runner, and
A water guide member provided over a portion of the total axial length of the runner, a mechanism that applies a spring force to the water guide member that can freely approach and leave the water guide member to push the water guide member back toward the runner, and a guide vane. The water pipe is provided in the casing so as to diagonally cross the waterway from the inner wall of the casing on the upstream side to the back of the guide vane, and the width of the upstream end is the same as the width of the waterway, and the width of the downstream end is such that the water can freely approach and leave. An inclined screen having the same width as the guide member, the downstream end of the screen facing the removable water guide member.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a foreign matter guiding device for a water turbine according to the present invention will be explained based on the drawings. FIG. 1 shows a side sectional view of a cross-flow turbine in which a conventional openable and closable guide vane 2 and a water guide member 1 are provided in a casing 4, as described above. 8 tries to get caught between the guide vane 2 and the runner 3, the momentum of the foreign object 8 and the rotational torque of the runner 3 push the guide vane 2 open in the direction of arrow A, and the foreign object 8 The runner 3 is swept downward without being damaged. Subsequently, even when the foreign object 8 reaches the water guide member 1, the water guide member 1 is pushed open in the direction of arrow B and the foreign object 8 is flushed out through the discharge pipe, as in the case of the guide vane 2. It is becoming.

On the other hand, FIG. 2 is a perspective sectional view showing an embodiment of the present invention in which a cross-flow water turbine is provided with a screen 6 in the form of a wire mesh, a grid, or the like. In this embodiment, the upper end of the screen 6 is fixed to the inlet waterway 5, and the lower end is connected to the guide vane 2 and the water guide member 1.
The screen 6 is installed with the screen 6 tilted so that the However, the water guide member 1, which can be opened and closed, is provided over a part of the total length of the runner 3 along the axis 9 direction, for example, over a part of the end part, and only that part can be freely approached and separated from the runner 3. A spring force is applied to push it back toward the runner 3 side. This water guide member 1, which can be approached and separated, is located downstream of the guide vane 2 with the runner 3 in between, and is supported by the casing 4 there. In addition, the screen 6 is connected to the casing 4 at a position upstream of the guide vane 2.
A water channel 5 runs from the inner wall to the back of the guide vane 2.
The downstream end of the screen 6 faces the water guiding member 1 which can be freely approached and separated. Further, the screen 6 has its upstream end widened to the full width of the water channel 5, and its downstream end has the same width as the water guiding member 1, which can be approached and separated. Therefore, at this time, the foreign matter 8 that has entered from the inlet waterway 5 is received by the screen 6 and guided to the guide vane 2 and the water guide member 1.

Therefore, since the water guiding member 1 and the guide vane 2, which can be opened and closed, are provided at the point where the foreign matter 8 is guided, even if the runner 3 is long in the direction of the runner axis 9, the foreign matter 8 can be guided over the entire surface. There is no need to provide the water guiding member 1 and the guide vane 2. In the embodiment shown in FIG. 2, in both the water guide member 1 and the guide vane 2, only the portion located at the lower end of the screen 6 automatically opens due to the pushing force when the foreign object 8 comes, and when the foreign object 8 passes through. It has a split structure so that it automatically returns to its original position. In addition, it is desirable that this screen 6 has an inclination angle that does not interfere with water, and
If the downstream side is extended to a range that does not interfere with the opening and closing of the guide vane 2 and does not allow foreign matter 8 to flow between the runner 3 and the guide vane 2, the only mechanism that can be freely opened and closed is the water guide member 1. Therefore, the guide vane 2 does not necessarily need to be provided with the guide vane 2.

When such a screen 6 is provided, foreign matter 8 entering the inlet waterway 5 is separated and guided by the screen 6, and is flowed out onto the guide vane 2 or from the guide vane 2 toward the water guide member 1 side. Finally, the water passes through the water guide member 1 by pushing it open, and is drained to the outside.

For reference, the lower end of the screen 6 does not stay on the runner 3, but extends further to the runner shaft 9.
If a space is provided between the runner side end surface 3' of the direction and the casing inner wall surface 7 through which the runner shaft 9 passes, and the foreign matter 8 is guided there, the guide vane 2 or the water guide member 1, etc., there may be a structure that does not require a special mechanism.
A structure was required over the entire area of the water guide member 1 and further up to the guide vane 2 to flush away foreign matter 8 caught between them and the runner 3. Foreign matter 8
By guiding the water to a predetermined location, these structures
This means that it is only necessary to provide it at locations where the foreign matter 8 passes through. This simplifies the structure, requires fewer parts, and requires less processing time. The most important effect is that there is almost no fear of damage to the runner 3 etc. due to foreign objects.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an example of a cross-flow water turbine, and FIG. 2 is a perspective sectional view showing an embodiment of the present invention applied to a cross-flow water turbine. In the drawings, 1 is a water guide member. , 2 is a guide vane,
3 is a runner, 3' is a runner side end surface, 4 is a casing, 5 is an inlet waterway, 6 is a screen, 7 is an inner wall surface of the casing, 8 is a foreign object, and 9 is a runner shaft.

Claims (1)

[Scope of utility model registration request] In a water turbine including a guide vane in a waterway leading to a runner, and a water guide member in a casing whose tip approaches the runner and guides water to the runner, the runner is positioned downstream of the guide vane with the runner between the runners. A water guide member is supported on the casing so as to be able to move toward and away from the runner, and is provided over a portion of the total axial length of the runner; A mechanism is provided in the casing that diagonally crosses the waterway from the inner wall of the casing upstream of the guide vane to the back of the guide vane, and the width of the upstream end is the same as the width of the waterway. and an inclined screen whose downstream end has the same width as the width of the removable water guiding member, and the downstream end of the screen faces the removable water guiding member. Water turbine foreign object guide device.