JP2004239163A - Water turbine facility having siphon type suction water channel and method for operating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water turbine facility having a siphon type suction water channel which shortens a starting time and which simplifies a system, and to provide a method for operating the same. <P>SOLUTION: The suction duct 11 of a water turbine 12 is installed so that the suction duct 11 is once routed through the position higher than the high water level of a suction water level 1, and then the suction side end is submerged in the suction water level 1. An air purge means 20 having an opening/closing valve 21 and an air purge tube 22 is mounted at the highest position of the suction duct 11, and a check valve 15 for passing the water only in the direction of the water turbine 12 is mounted at the suction side of the suction duct 11. At the starting time, a motor-cum-generator 14 coupled to the water turbine 12 is driven as a motor to perform a pumping action. Thus, the water of a discharge duct 13 side is reversely fed toward the suction duct 11, and the air in the suction duct 11 is extracted through the air purge means 20. When the suction duct 11 is fully filled with the water, the air purge means 20 is closed to stop the pumping action, the water is automatically supplied to the water turbine 12 by the siphon action, and the operation of the water turbine is started. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suction pipe of a water turbine (in this specification, the terms "suction" and "discharge" are used in a fixed manner in terms of the operation of the turbine, regardless of whether the turbine is operating or the pump is operating). The pipe is designed to pass through a position higher than the suction water level HWL (high water level), and then the air in the suction pipe is extracted, and the water is guided to the water turbine by using the principle of the siphon generated thereby. TECHNICAL FIELD The present invention relates to a water turbine facility having a siphon-type suction water channel and an operation method thereof.
[0002]
[Prior art]
Conventionally, in a water turbine facility having a siphon-type suction water channel, the water supply can be reliably stopped by simply breaking the siphon when the turbine is stopped.Therefore, an on-off valve for stopping the movement of water when the turbine is stopped is provided with a suction pipe or the like. There is an advantage that it need not be installed in the discharge pipe.
[0003]
In the case of this water turbine facility, how to form a siphon at the time of starting the water turbine is a problem.Conventionally, prior to the start of the water turbine, the air in the suction pipe is extracted by a separately installed wet vacuum pump to siphon. Had formed. The pipe of the vacuum pump is connected to the downstream side of the air vent pipe installed at the highest position in the suction pipe.After detecting that the air in the suction pipe has completely escaped, the air vent pipe is closed and the water turbine is closed. I had started driving.
[0004]
However, when a siphon is formed by the above method, it is indispensable to install a wet vacuum pump as an auxiliary device of the water turbine, and the diameter of the vacuum pump is considerably smaller than the diameter of the water turbine. Prior to starting, there is a problem that it takes a considerable amount of time to remove air in the suction pipe of the water turbine with a vacuum pump.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a water turbine facility having a siphon-type suction water channel that can shorten the start-up time, and can simplify the system without the need for a vacuum pump. It is to provide a driving method.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is directed to a water turbine facility having a siphon-type suction water channel, wherein air suction means is attached to an uppermost position of a suction pipe forming the suction water channel, and the suction pipe has A siphon-type suction channel characterized in that a check valve that allows water to flow only in the direction of the turbine is installed on the suction side of the position where the air release means is mounted, and a motor / generator or a motor and a generator are connected to the turbine. There is in the water turbine equipment to have.
[0007]
Also, the invention according to claim 2 of the present application is characterized in that the motor / generator is driven as a motor at the time of starting the water turbine facility, and feeds back the water on the discharge pipe side toward the suction pipe to remove the air in the suction pipe. It is configured to draw out through the air bleeding means, and to generate electricity as a generator by water flowing from the suction pipe to the discharge pipe when the suction pipe is filled with water to the extent that a siphon action occurs and the air bleed means is closed. A water turbine facility having a siphon-type suction water channel according to claim 1.
[0008]
Further, the invention according to claim 3 of the present application is characterized in that the motor and the generator are connected to the water turbine through the power switching means, respectively, the motor and the generator. Water is sent back to the suction pipe to draw out the air in the suction pipe through the air bleeding means.On the other hand, when the suction pipe is filled with water to the extent that a siphon action occurs and the air bleeding means is closed, the water flows from the suction pipe to the discharge pipe. The water turbine facility having a siphon-type suction water channel according to claim 1, wherein the water generator is configured to generate power by driving a generator by flowing water.
[0009]
That is, a check valve is mounted on the suction side of the turbine to allow water to flow only in the direction of the turbine, and a motor-generator (or a motor and a motor within the generator) is used as a motor at the time of starting, so that pump operation is performed. The water on the discharge side of the turbine is sent back toward the suction side to pressurize the suction pipe, and the air in the suction pipe is extracted through the air release means provided at the top of the suction pipe. If the pump is stopped after closing the air venting means after confirming that water is full by the water coming out of the air venting means, for example, water will automatically flow from the suction pipe through the inside of the turbine to the discharge pipe by siphon action. Then, the turbine is started, and the motor / generator (or the generator in the motor and the generator) connected to the water axle operates as a generator to generate electric power.
[0010]
Here, if the motor used for pump operation and the generator used for power generation of the turbine are performed by the same motor and generator to perform a dual role, the equipment machine is simplified, and the water turbine is used. By inverting and pumping, the air in the suction pipe can be extracted in a shorter time than when a small wet vacuum pump is used.
[0011]
When a motor used for pump operation and a generator used for turbine power generation are separately installed, the motor and the generator are connected to the turbine through power switching means such as a clutch or a switching gear. What is necessary is just to switch the motor connected to the water turbine and the generator by the switching means. When the water turbine equipment is mainly used for power generation, the generator is usually connected to the water turbine, and the motor is connected to the water turbine by power switching means when a pump action is required.
[0012]
The non-return valve can be of any mechanism as long as it has the function of stopping the flow of water in the reverse direction. For example, a flap valve, a foot valve, or the like can be used. A valve having a simple structure and leaking about 10% of the flow rate when the water turbine is operated can be used.
[0013]
The air bleeding means may be any mechanism that can bleed the air in the suction pipe at the uppermost part in the suction pipe, and may be configured by, for example, an air bleed pipe and an on-off valve. If this air venting means is also used to introduce air into the suction pipe, it can also be used to break the siphon by introducing air into the suction pipe when stopping the operation of the water wheel. In addition, an automatic air release valve is installed in the air release pipe, and a mechanism that closes the valve when air is released by the water pump and water fills the valve is used. If a converter capable of converting to the above is attached, it is possible to obtain the signal and open and close the on-off valve in the pipe. If the on-off valve is an electromagnetic valve or a motor-operated valve, it can be automatically closed, and this signal can be obtained to automatically switch the wiring of the motor / generator connected to the water turbine. Further, this air bleeding means may be used exclusively for bleeding air, and an air inlet pipe for breaking the siphon may be separately provided. The timing for closing the air venting means may be not only when the suction pipe is completely filled with water, but also when the suction pipe is completely filled with siphon action.
[0014]
According to a fourth aspect of the present invention, in the method for operating a water turbine having a siphon-type suction water channel, the suction pipe which forms the suction water channel by once operating the water turbine as a pump at the time of start-up has a siphon effect. An operation method of a water turbine facility having a siphon-type suction water channel, characterized in that the water turbine is operated after being filled with water up to a maximum.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall configuration diagram of a water turbine facility having a siphon-type suction channel according to an embodiment of the present invention. As shown in the figure, the water turbine facility having the siphon type suction water channel is configured by connecting a suction pipe 11 to a suction side of a water turbine 12 and a discharge pipe 13 to a discharge side.
[0016]
Here, the suction pipe 11 passes through a position higher than the HWL of the suction water level 1 (that is, a water level at which the suction water level 1 does not rise any more) from the suction side of the water wheel 12 and then moves the suction side end to the liquid of the suction water level 1 It is configured to bend below the surface. That is, the suction pipe 11 forms a siphon pipe. At the uppermost position of the suction pipe 11, an air venting means 20 is attached. In this embodiment, the air release means 20 includes an on-off valve 21 and an air release pipe (exhaust pipe) 22. A check valve 15 that allows water to flow only in the direction of the water wheel 12 is installed at the inlet end (suction end) of the suction pipe 11. The check valve 15 may be provided not at the inlet end of the suction pipe 11 but at an upper portion thereof. In short, the check valve 15 may be provided at a position closer to the suction side of the suction pipe 11 than the position to which the air release means 20 is connected.
[0017]
The water wheel 12 is a vertical water wheel, and is configured by housing an impeller 12a in a casing. The impeller 12a is installed at a position lower than the LWL (low water level) of the discharge water level 2 (that is, a water level at which the discharge water level 2 does not drop any more) (at least a position where the lower part of the impeller 12a comes into contact with water). Even if the water level 2 becomes the lowest water level, it is installed at a position where the water on the discharge side can be pumped. A motor / generator 14 is provided above the water wheel 12, and the rotary drive shaft of the water wheel 12 is connected to the rotary drive shaft of the motor / generator 14. In the motor / generator 14, the same device can be used by switching only the wiring to the power supply wiring when using the motor and the current output wiring when using as the generator.
[0018]
When a water wheel operation is performed by the water turbine equipment, it is necessary to first form a siphon in the suction pipe 11, so that the motor / generator 14 is driven as a motor with the open / close valve 21 first, and the water wheel 12 Is pumped, and the water on the discharge pipe 13 side, that is, the water in the discharge tank 32 is sent back to the suction pipe 11. Thus, the inside of the suction pipe 11 is filled with water while the air in the suction pipe 11 is extracted from the air vent pipe 22. Immediately after it is confirmed that water has come out of the air vent pipe 22 and the inside of the suction pipe 11 has been filled with water, the on-off valve 21 is closed, and at the same time, the motor / generator 14 is driven as a motor (pump action). Is stopped and the wiring is switched for the generator.
[0019]
As a result, the inside of the suction pipe 11 is filled with water to form a siphon, so that the water in the suction tank 31 flows into the discharge tank 32 through the suction pipe 11, the water wheel 12, and the discharge pipe 13, and the water wheel 12 Is rotated (water turbine operation), and the motor / generator 14 connected to the water turbine 12 is rotationally driven as a generator to output the generated power. During the operation of the water turbine, the uppermost portion of the suction pipe 11 has a pressure lower than the atmospheric pressure. Therefore, when the air vent pipe 22 is open to the atmosphere, the on-off valve 21 is closed during the operation of the water turbine as described above. I have to put it.
[0020]
Next, when stopping the operation of the water turbine, if the on-off valve 21 installed at the uppermost part of the suction pipe 11 is opened, the uppermost part of the suction pipe 11 has a negative pressure with respect to the atmosphere. Then, air is introduced into the suction pipe 11, the water during the siphon action drops, and the water is not supplied to the water turbine 12, and the water turbine 12 stops.
[0021]
In the above embodiment, the motor / generator 14 is installed. Instead, two motors and generators are separately installed, and these motors and generators are connected to power switching means such as switching gears and clutches. The switching may be performed so that the same function as the motor / generator 14 is exhibited. Here, FIG. 2 is an overall configuration diagram of a water turbine facility having a siphon-type suction water channel according to another embodiment of the present invention in which two motors 17 and generators 18 are separately provided instead of the motor / generator 14. is there. In the figure, the same parts as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. That is, in this water turbine equipment, a motor 17 and a generator 18 are installed above a water turbine 12 via a switching gear 19 instead of the motor / generator 14. The water turbine 12 is normally connected to the generator 18 at the switching gear 19, and the water wheel 12 is connected to the motor 17 by switching the switching gear 19 as necessary. As in the embodiment shown in FIG. 1, at the time of starting the water turbine equipment, the motor 17 is driven to reversely feed the water on the discharge pipe 13 side to the suction pipe 11, and the air in the suction pipe 11 is removed through the air release means 20. On the other hand, when the suction pipe 11 is filled with water to such an extent that a siphon action is generated and the air release means 20 is closed, the generator 18 is driven by water flowing from the suction pipe 11 toward the discharge pipe 13 to generate power.
[0022]
3A and 3B are enlarged schematic cross-sectional views of a water turbine 12 according to still another embodiment of the present invention. That is, in FIGS. 3 (a) and 3 (b), two motors 17 and two generators 18 are separately installed as in the case of FIG. 2, but in FIG. A motor 17 and a generator 18 are installed right above the impeller 12a, and a rotary drive shaft 26 connected to the motor 17 via a clutch 25 is penetrated into the generator 18 and connected to the impeller 12a. A rotary drive shaft 28 connected to the generator 18 via a clutch 27 and passing the rotary drive shaft 26 therein is also connected to the impeller 12a. That is, both rotation drive shafts 26 and 28 are double shafts. When the clutch 25 is connected and the clutch 27 is disconnected, the motor 17 is connected to the impeller 12a. When the clutch 27 is connected and the clutch 25 is disconnected, the generator 18 is connected to the impeller 12a. Even with this configuration, the generator 17 and the motor 18 can be connected to the water turbine 12 by switching.
[0023]
In FIG. 3B, a double-suction type water wheel is used as the water wheel 12, and rotary drive shafts 26 and 28 connected to both ends of the impeller 12a are connected to the motor 17 and the generator 18 via clutches 25 and 27, respectively. Connected and configured. When the clutch 25 is connected and the clutch 27 is disconnected, the motor 17 is connected to the impeller 12a. When the clutch 27 is connected and the clutch 25 is disconnected, the generator 18 is connected to the impeller 12a. Even with such a configuration, the generator 17 and the motor 18 can be switched and connected to the water turbine 12.
[0024]
【The invention's effect】
As described in detail above, according to the present invention, a water wheel having a water channel forming a siphon is rotated in reverse to perform a pump action, discharge air in a suction pipe to form a siphon, and start water wheel operation. Therefore, the air in the suction pipe can be extracted in a short time, and the start-up time of the water turbine can be reduced. In addition, the system can be simplified without the need for a vacuum pump.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a water turbine facility having a siphon-type suction channel according to an embodiment of the present invention.
FIG. 2 is an overall configuration diagram of a water turbine facility having a siphon-type suction channel according to another embodiment of the present invention.
FIGS. 3 (a) and 3 (b) are enlarged schematic sectional views of a water turbine 12 according to still another embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 suction water level 2 discharge water level 11 suction pipe 12 water wheel 12a impeller 13 discharge pipe 14 motor / generator 15 check valve 17 motor 18 generator 19 switching gear (power switching means)
Reference Signs List 20 air release means 21 open / close valve 22 air release pipe (exhaust pipe)
25 Clutch (power switching means)
26 rotation drive shaft 27 clutch (power switching means)
28 Rotary drive shaft 31 Suction tank 32 Discharge tank

Claims (4)

In a water turbine facility with a siphon type suction channel,
Attached to the uppermost position of the suction pipe that forms the suction water passage is an air release means, and a check valve that allows water to flow only in the direction of the turbine to the suction side of the suction pipe from the position where the air release means is mounted. A water turbine facility having a siphon-type suction water channel, wherein a motor / generator or a motor and a generator are connected. The motor / generator is driven as a motor at the time of starting the water turbine facility, and reversely feeds water on the discharge pipe side toward the suction pipe to extract air in the suction pipe through the air bleeding means, while the suction pipe has a siphon action. The siphon-type suction water channel according to claim 1, wherein the water is supplied from the suction pipe to the discharge pipe to generate power as a generator when the air venting means is filled with water to the extent that the water is generated. Have water turbine equipment. The motor and the generator connect the motor and the generator to the water turbine via power switching means, respectively, and when the turbine equipment is started, the motor is driven to reversely feed the water on the discharge pipe side toward the suction pipe for suction. The air in the pipe is extracted through the air release means, while the suction pipe is filled with water to the extent that a siphon action is generated and when the air release means is closed, a generator is driven by water flowing from the suction pipe toward the discharge pipe to generate power. The water turbine facility having a siphon-type suction water channel according to claim 1, characterized in that: In the method for operating a water turbine facility having a siphon-type suction water channel, it is characterized in that at the time of starting, the water turbine is once operated as a pump, and the suction pipe forming the suction water channel is filled with water to an extent that a siphon action is generated, and then the water turbine is operated as a water wheel. Method of operating water turbine equipment with siphon-type suction water channel.

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