JP2907905B2 - Hydraulic machinery - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hydraulic machine using seawater, and more particularly to a hydraulic machine having a function of preventing corrosion.

[Conventional technology]

In recent years, attempts have been made to use seawater for hydroelectric power generation. Hydropower will be installed on the shore, and a water reservoir will be installed above the shore. By operating the pump provided in the water reservoir, the seawater is pumped into the water reservoir by the water channel installed between the water reservoir and the water reservoir, and the seawater is filled. Open the gate of the water reservoir and let the seawater flow from the water reservoir to the surface of the sea via the water channel. Then, a power plant is provided in the middle of the waterway, and a turbine of the power plant is rotated by the flow rate of seawater, and the generator converts seawater into electric power.

[Problems to be solved by the invention]

However, in a turbine through which seawater passes, the runner is disposed in a channel formed between the upper cover and the lower cover, so that the runner and both covers are corroded by the seawater, and the life of the turbine is short. And lacked practicality. Incidentally, as this type of apparatus, JP-A-53-25747 can be mentioned.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic machine capable of preventing corrosion progress and extending the life of a water turbine.

[Means for solving the problem]

To achieve the above object, the present invention provides a hydraulic machine device including a runner that rotates together with a rotation shaft, an upper cover disposed on an upper portion of the runner, and a back chamber formed between the upper cover and the runner. A seal portion provided between the upper cover and the runner, a plurality of electrodes provided on the upper cover so as to sandwich the seal portion, and a first back chamber surrounded by the upper cover, the seal portion, and the runner, An upper cover provided on the outer peripheral side from the first rear chamber, a second rear chamber surrounded by a seal portion and a runner, and a first rear chamber and a second rear when current is passed between a plurality of electrodes. A first discharge pipe connected to the first rear chamber for discharging gas generated in the chamber and a second discharge pipe connected to the second rear chamber are provided.

[Action]

In the hydraulic machine of the present invention, in order to prevent the sealing performance from deteriorating due to rust due to seawater, a plurality of electrodes are provided on the upper cover so as to sandwich the sealing portion, and a current is applied to this electrode to allow the sealing portion to reduce the sealing portion. Exhaust gas in the first and second rear chambers that accumulate prevents rusting of the seal part and delays the progress of corrosion due to gas, thereby preventing the deterioration of the sealing performance of the water turbine machinery. Is made possible.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 2 is a side sectional view showing a part of the water turbine, and FIG. 1 is a schematic view of the corrosion delay device 13 used in FIG.

The runner 3 is housed between the upper cover 1 and the lower cover 2. The runner 3 is rotated by seawater 4 flowing in the water channel from the upstream side to the downstream side. Seawater 4 adjusts the amount of seawater by opening and closing a guide vane 5 provided on the upstream side. Guide vane 5
Is supported between the covers 1 and 2. Upper and lower rear chambers 6, 7 are formed between the covers 1, 2 and the runner 3.

A plurality of electrodes 8A to 8D are attached to both covers 1 and 2 of both rear chambers 6 and 7. Each electrode forms a current passage through a cover. In particular, the electrodes are arranged with a seal portion sealing the upper cover 1 and the runner 3 interposed therebetween. Preventing. Further, pipes 9 and 10 are provided in a first rear chamber surrounded by the upper cover 1 and the seal portion and the runner 3, and the upper cover 1 and the seal portion provided on the outer peripheral side of the first rear chamber are provided. A pipe 11 is disposed in a second rear chamber surrounded by the runner 3, and the pipes 10 and 11 communicate with a suction pipe of FIG. 3 described later. The remaining pipe 10 is connected to the electrodes 8A to 8D
Also, it is in communication with the corrosion delay device 13.

The corrosion delay device 13 is configured as follows. Both electrodes
8A and 8B are connected to the monitoring device 14, and the monitoring device 14 and both electrodes 8A and 8B
Means that a current is flowing through the wiring 12 and the upper cover 1, and this current is monitored by the monitoring device 14. The current hardly flows according to the corrosion of the inner surface of the upper cover. That is, the current value becomes smaller than the initial current value as the corrosion progresses, and thus the change value is input to the control unit 15. The output of the control unit 15 is input to the pump P and the motor M. Then,
The opening and closing of an on-off valve 16 provided on the pipe 9 and the operation of the pump P are controlled, and the seawater 4 or chlorine gas 18 from the pump P is drained or exhausted. Reference numeral 17 denotes a chlorine gas detector provided in the upper rear chamber 6, the output of which is input to the control unit 15, and performs the same operation as described above.

 Next, the operation of the corrosion delay device 13 will be described.

When the runner 3 is rotated by the seawater 4 flowing in the water channel, the seawater 4 also flows in the rear chambers 6 and 7 in the direction of the arrow. At this time, the seawater 4
The generated chlorine gas 18 is exhausted together with the seawater in the direction of the suction pipe, and there is little corrosion progress on the interior surfaces of the rear rooms.

However, when the operation of the turbine is stopped, the guide vanes 5
Is closed, the seawater 4 stops flowing in the direction of the arrow, and stays in the upper rear chamber 6. Then, the seawater 4 in the upper rear room generates chlorine gas 18 by electrolysis due to the current flowing between the two electrodes. The chlorine gas 18 corrodes the upper rear indoor surface. The corroded portion 18A blocks the flow of current. That is, the corroded portion 18A is a kind of resistance. As a result, the value of the current flowing between the electrodes during the virgin operation of the turbine
Assuming that the current value when the corrosion has progressed to some extent is 5, this measured value is input to the monitoring device 14. An output signal from the monitoring device 14 is input to the control unit 15. Control unit 14
Is input to the pump P and the motor M. The motor M rotates in one direction to open the on-off valve 16, and the pump P starts operating. The seawater 4 and chlorine gas 18 are sucked up by the pump P and exhausted to a pit (not shown). For this reason, in the upper cover, the corrosion of the inner surface of the lower cover hardly progresses, and the life of the turbine can be extended.

In addition, since the current value decreases due to the progress of corrosion,
By monitoring this current value, both covers, especially the upper cover, can be replaced in advance.

Alternatively, the pump P may supply air or water to the rear chamber 6 to remove the chlorine gas 18 to the water absorption pipe side. Further, the corrosion delay device 13 may be operated every time the turbine stops. Although the upper rear chamber has been described above, the lower corrosion chamber may be provided with a corrosion delay device similar to that described above. Further, the operation of the chlorine concentration detector 19 is the same as that described above, and thus the description thereof is omitted.

FIG. 3 shows a case where valves 20 and 21 are provided in pipes 10 and 11 that supply and exhaust air to raise and lower the water level in the runner during the phase-matching operation. The valves 20 and 21 are opened and closed by a motor M. Electrodes 8A, 8B
The motor M is rotated by the change in the current flowing between
0 and 21 are opened to remove chlorine gas and seawater to the suction pipe 22. Valves 25 and 26 are connected to pipes 23 and 24 communicating with pipes 10 and 11, respectively.
May be provided. In this case, when the valves 20 and 21 are closed, the valves 25 and 26 are opened, and chlorine gas and seawater are exhausted and drained to the discharge pit 27 through the pipes 23 and 24, so that the existing equipment can be simplified. There are benefits that can be exploited just by improving. still,
30 is an inlet valve.

〔The invention's effect〕

As described above, in the hydraulic machine device of the present invention, it is possible to prevent rust in the seal portion between the upper cover and the runner, and to remove the gas in the rear chamber accumulated by the seal portion, thereby preventing corrosion of the seal portion. ing.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a corrosion delay device according to an embodiment of the present invention used in FIG. 2, FIG. 2 is a partial side sectional view of a water turbine according to an embodiment of the present invention, and FIG. It is a schematic diagram of a water wheel which is an Example of. 1,2 ... top and bottom cover, 3 ... water turbine, 4 ... seawater, 6,7 ...
... upper and lower rear chambers, 8A to 8D ... electrodes, 9 ... pipes, 13
…… Corrosion delay device, 14 …… Monitoring device, 16 …… Valve, 17 ……
Chlorine gas concentration detector.

Claims (3)

(57) [Claims] 1. A hydraulic machine device comprising: a runner that rotates together with a rotation shaft; an upper cover disposed on an upper portion of the runner; and a rear chamber formed between the upper cover and the runner. A seal portion provided between the upper cover and the runner, a plurality of electrodes provided on the upper cover so as to sandwich the seal portion, and a plurality of electrodes surrounded by the upper cover, the seal portion, and the runner. One back chamber, a second back chamber surrounded by the upper cover, the seal portion, and the runner provided on the outer peripheral side of the first back chamber, and a current was applied between the plurality of electrodes. Sometimes a first exhaust pipe connected to the first rear chamber and a second exhaust pipe connected to the second rear chamber for discharging gas generated in the first rear chamber and the second rear chamber. Hydro-mechanical device provided with a discharge pipe 2. The hydraulic machine according to claim 1, wherein when the runner is rotating, gas generated in the first rear chamber and the second rear chamber is exhausted in a direction of a suction pipe;
A hydraulic machine device wherein the gas is discharged from the first discharge pipe and the second discharge pipe when the runner stops. 3. The hydromechanical device according to claim 2, wherein the first discharge pipe and the first exhaust pipe are connected to each other in accordance with a change in a current flowing between the plurality of electrodes or a detection signal from a gas concentration detector in the rear chamber. A hydraulic machine device for discharging the gas from the second discharge pipe.