JP2012007312A - Water intake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the quantity of water intake from a water inlet below a predetermined quantity.SOLUTION: The water intake device comprises: a water intake body 11 fixed to a water channel 2 and having a passage which the whole amount of water W flowing through the water channel 2 passes; a water turbine gate 12 rotatably supported by the water intake body 11 and having blades 122, 123, 124, and 125 to limit the quantity of the flow of water W flowing through at least the water intake body 11 below a predetermined quantity; and stoppers 13 and 14, contactably provided to the water turbine gate 12, for preventing the water turbine gate 12 from rotating in reverse while allowing the water turbine gate 12 to rotate by the flow of water W. The water turbine gate 12 is configured to rotate by water W when the water level of the water channel 2 is less than a normal water level La, and to reversely rotate and be locked by water pressure acting on the blade 123 when the water level is more than a predetermined value, thereby the water amount of water W, which passes through the blade 123 in contact with the stoppers 13 and 14, is less than a predetermined amount.

Description

  The present invention relates to a water intake device arranged in a small water channel such as a mountain stream, and more particularly to a water intake device capable of maintaining the water intake amount below a predetermined amount even when the water level rises.

  Regarding the use of water in rivers, laws and regulations stipulate that the purpose of use is limited to agricultural water and power generation water used at hydroelectric power plants, etc. . For this reason, the amount of water taken from the river is automatically controlled so as to comply with the law and not exceed a predetermined amount (permitted water intake).

  By the way, since small rivers (mountain streams, etc.) are often mountainous areas where it is difficult to secure a power source, it is difficult to automatically control water intake. Therefore, in small rivers, people take a trip to the site to start water intake, and the intake opening is set small so that the specified amount is not exceeded even at the flood water level (during flooding). . However, the method in which people go to the local area cannot use water resources effectively because no water can be taken while the person is not in the area. In addition, the method of setting the opening of the intake port to a small value determines the opening amount of the intake gate to be small in consideration of floods, so only a small amount of water can be taken at the normal water level (normal time). There is a problem that the power generation amount to be obtained cannot be obtained.

  In view of this, a technique relating to a non-power source type gate control device capable of obtaining a predetermined water intake amount corresponding to changes in river flow rate and water level has been proposed (for example, see Patent Document 1). Moreover, the technique (for example, refer patent document 2) regarding the sluice door fall instruction | command apparatus which detects automatically that the water level of the upstream of the sluice provided in the water intake went up, and descend | falls the sluice door. There has been proposed a technique relating to a discharge or water intake device by automatic power-free control that can control the water discharge amount and water intake amount with high accuracy using buoyancy (see, for example, Patent Document 3). Furthermore, a technique relating to a water intake control device that sets an upper limit value and a lower limit value of the water level of the tunnel and enables water intake other than the water intake port only when the water level is between them (for example, patent document). 4).

JP 2008-133653 A JP 2000-129660 A JP 2004-353197 A JP 2007-277808 A

  However, the non-power source type gate control device described in Patent Document 1 requires a quantity of water that generates opening / closing power of the intake gate, so that the rivers that can be installed are limited and can be installed in small rivers. Can not. Further, the sluice door drop command device described in Patent Document 2 requires manual operation when the water level drops and water intake is resumed after the water level rises and the sluice door is closed. That is, the intake port cannot be opened and closed automatically according to the water level of the river, and switching between intake and intake stop cannot be automatically performed. Therefore, even if the water level drops after the predetermined water level is detected and stopped, there will be a time lag before resuming water intake, and the time during which water will not be taken will be prolonged. Not enough.

  Moreover, the discharge or water intake device by automatic control without power source described in Patent Document 3 has a complicated mechanism and needs to repair an existing water intake gate, so that the installation period and cost increase. Since the water intake control device described in Patent Document 4 takes water only when the water level of the tunnel is within a predetermined range and does not take water when the water level of the road is outside the predetermined range, the river water cannot be effectively used. Furthermore, any of the techniques described in Patent Documents 1 to 4 has a problem that it cannot be easily applied to an existing water channel because it requires a water channel repair work to be installed in an existing gate device.

  Therefore, an object of the present invention is to provide a water intake device that has a simple structure and can quickly maintain the water intake amount below a predetermined amount even when the water level of the water channel rises.

  In order to solve the above problems, the invention of claim 1 is a water intake device that is provided in a water channel and maintains a flow rate of water flowing through the water channel below a predetermined amount, and is fixed to the water channel and flows through the water channel. A water intake gate having a flow path through which the entire amount of water passes, a water turbine gate having a blade that is rotatably supported by the water intake body and restricts the flow rate of water passing through the water intake body to a predetermined amount or less, and the water turbine gate. And a stopper that prevents the turbine gate from rotating in reverse while allowing the turbine gate to rotate due to the flow of water, and the turbine gate has a water level below the normal water level. When the water level of the water channel exceeds the set value, it rotates in the reverse direction due to the water pressure acting on the slats, and the rotation is locked by contact with the stopper. Through the slats The flow rate of water is less than a predetermined amount, characterized in that.

  According to the present invention, the water turbine gate rotates by the water flow of the water channel when the water level of the water channel is below the normal water level, and reverses by the water pressure acting on the blades when the water level of the water channel exceeds the set value. And the rotation is locked by contact with the stopper.

  According to a second aspect of the present invention, in the water intake device according to the first aspect, the water intake body is fixed to the water channel by being pressed by an existing water intake gate.

  Invention of Claim 3 is the water intake apparatus of any one of Claim 1 or 2, The blade board of the said turbine wheel gate passes the said water intake body and the water-impervious blade board which blocks | prevents passage of the said water A water intake restriction vane plate having a flow path for restricting a flow rate of water to be equal to or less than a predetermined amount, and the water shielding vane plate and the water intake restriction vane plate face each other with respect to a rotation center of the water turbine gate. The stopper is capable of coming into contact with at least one of the water shielding blade and the water intake restriction blade.

  According to a fourth aspect of the present invention, in the water intake device according to any one of the first to third aspects, a generator is connected to the turbine wheel gate.

  According to the first aspect of the present invention, when the water level in the water channel exceeds the set value, the water turbine gate is rotated in the reverse direction by the water pressure acting on the blade, and the rotation is locked by the contact with the stopper. Therefore, the flow rate of water passing through the slats is limited to a predetermined amount or less, and an appropriate amount of water can be taken even when the water level in the water channel rises. Therefore, even if the water level in the water channel rises significantly, it is possible to ensure compliance with laws and regulations regarding the amount of water intake.

  In addition, since the rotation direction of the turbine gate is switched using the change in the water level flowing through the water channel, no power supply is required to adjust the water intake, and it can be used even in mountainous areas where it is difficult to secure power supply. Become.

  According to the invention described in claim 2, since the intake body is fixed to the water channel by being pressed by the existing intake gate, the repair work of the water channel itself becomes unnecessary, and the construction period can be shortened and the installation cost can be reduced. it can.

  According to the invention described in claim 3, the vane plate of the turbine wheel gate includes a water-impervious vane plate that prevents passage of water, and a water intake restriction vane plate that restricts the flow rate of water passing through the water intake body to a predetermined amount or less. Therefore, the design for limiting the water intake becomes easy. That is, water intake at the time of rising water level is performed through the intake restriction blade, so it is only necessary to secure a flow path that restricts the flow rate of water to a predetermined amount or less only on the intake restriction blade, and the design of the intake device is easy It becomes. In this way, the flow rate of water can be limited to a predetermined amount or less with a simple structure, so that there are few failures, the reduction in water intake is minimized, and river water can be effectively used.

  According to the invention described in claim 4, since electric power can be obtained by the generator connected to the turbine wheel gate, for example, the driving of the dust remover installed on the upstream side of the water intake body, the operation of the recorder and the illumination Information communication with the management center is also possible.

It is sectional drawing which shows the state which installed the water intake apparatus which concerns on Embodiment 1 of this invention in the water channel. It is a front view of the water intake apparatus of FIG. It is an expanded sectional view which shows the motion of the waterwheel gate at the time of the normal water level in the water intake apparatus of FIG. It is an expanded sectional view which shows the contact state of the waterwheel gate and stopper at the time of the normal water level in the water intake device of FIG. It is an expanded sectional view which shows the motion of the waterwheel gate at the time of the water level rise in the water intake device of FIG. It is an expanded sectional view which shows the state where rotation of the waterwheel gate in the water intake device of FIG. 1 was locked. It is a top view which shows the water intake restriction | limiting blade board of the water intake apparatus which concerns on Embodiment 2 of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 to 6 show Embodiment 1 of the present invention. Here, the symbol La indicates the case where the water level of the water channel is the normal water level, and the symbol Lb indicates the case where the water level of the water channel is the intake water level (set water level) of the permitted water intake amount.

  The water intake device 1 is a device for maintaining the flow rate of the water W flowing through the water channel 2 below a predetermined amount. As shown in FIGS. 1 and 2, the water intake device 1 is, for example, a water intake gate that can be moved up and down by operating a handle 4a in order to take water from a water intake 3 of a water channel 2 such as a small river in a hydroelectric power plant. 4 and the bottom surface 2 a of the water channel 2. The water intake device 1 mainly includes a water intake body 11 that takes in water W from the water channel 2 and a turbine wheel 12 that restricts the flow rate of the water W passing through the water intake body 11 to a predetermined amount or less.

  The intake body 11 has a flow path through which the entire amount of water W flowing through the water channel 2 passes. The water intake body 11 is made of a cylindrical body made of steel or FRP (Fiber Reinforced Plastics). The lower surface 11 a of the water intake body 11 is formed in a plane parallel to the bottom surface 2 a of the water channel 2. On the upper surface 11 b of the water intake body 11, a step surface 11 c is formed such that the downstream side is lower than the upstream side. A cushion body 5 is provided on the downstream side of the upper surface 11 b (step surface 11 c) of the water intake body 11.

  The downstream side of the upper surface 11 b of the water intake body 11 provided with the cushion body 5 is pressed from above by the existing water intake gate 4. A cushion body 6 is provided on the lower surface 11 a of the water intake body 11. Thus, the water intake body 11 is fixed to the water channel 2 so that the lower surface 11a is in close contact with the bottom surface 2a of the water channel 2 by being pressed by the water intake gate 4. Further, the step surface 11 c of the water intake body 11 has a function of preventing the water intake body 11 from flowing downstream of the water intake gate 4. Here, the cushion bodies 5 and 6 are made of an elastic body such as a water-tight rubber, and elastically support the water intake body 11 with respect to the water channel 2 and also prevent water leakage from the outer peripheral portion of the water intake body 11. It plays the role of a member.

  As shown in FIG. 2, gap adjusting members 7 and 8 are disposed between the outer surface of the water intake body 11 and the side wall of the water intake gate 4. The gap adjusting members 7 and 8 have a function of preventing water leakage from the gap between the outer surface of the water intake body 11 and the side wall of the water intake gate 4, and the horizontal length can be adjusted. The part is provided with a seal member (not shown).

  In the intake body 11, the upstream opening 111 and the downstream opening 112 communicate with each other. In this water intake body 11, the area of the upstream opening 111 is larger than the area of the downstream opening 112, the cross-sectional shape in the water flow direction is set to a substantially L shape, and the axial direction of the water intake body 11 coincides with the water flow direction. Are arranged as follows. The upstream side opening 111 of the water intake body 11 is set to a height that is immersed by the water W in the water channel 2 when the water level rises. Further, when the water level exceeds the upstream opening 111, the water W flowing through the water channel 2 is restricted by the intake gate 4.

  A water wheel gate 12 is provided in the upstream opening 111 of the water intake body 11. As shown in FIG. 3, the water wheel gate 12 is rotatably supported by the water intake body 11. The turbine wheel 12 includes a rotating shaft 121, water shielding blades 122 and 123, and intake restriction blades 124 and 125. The water shielding blades 122 and 123 are plate-like bodies and have a function of blocking the passage of the water W. The intake restriction blades 124 and 125 have a number of mesh-like (screen-like) flow paths S that restrict the flow rate of the water W passing through the intake body 11 to a predetermined amount or less by a mesh-like body (screen-like body). . That is, the total flow rate of the water W passing through the multiple flow paths S of the intake restriction blades 124 and 125 is limited to a predetermined amount or less. The water shielding blades 122 and 123 and the water intake restriction blades 124 and 125 are attached to the rotating shaft 121 with a predetermined interval.

The water-impervious blades 122 and 123 and the water intake restriction blades 124 and 125 are made of a light and high-strength material such as FRP and set to the same weight. Further, the water shielding blades 122 and 123 and the water intake restriction blades 124 and 125 cover the upstream opening 111 of the water intake body 11 in a state where the rotation of the water turbine gate 12 is locked. Furthermore, the water intake restriction blades 124 and 125 are configured such that the flow rate (water intake amount) of the passing water W is equal to or less than a predetermined amount, that is, the allowable water intake amount (legal quantification) in a state where the rotation of the turbine wheel 12 is locked. In addition, the area of the flow path S is set. In this embodiment, the area of the flow path S is secured by appropriately selecting the mesh size of the water intake restriction blades 124 and 125.

  The water shielding blade 122 and the water intake restriction blade 124 are fixed to the rotating shaft 121 so as to face each other with respect to the rotation center of the water turbine gate 12. The water shielding blade 123 and the water intake restriction blade 125 are fixed to the rotating shaft 121 so as to face each other with respect to the rotation center of the water turbine gate 12. That is, each blade of the turbine wheel 12 is arranged at a position divided into four equal parts in the rotation direction, and is fixed to the rotating shaft 121 so that adjacent blades are substantially perpendicular to each other.

  When the water level of the water channel 2 is equal to or lower than the normal water level La, the water wheel gate 12 is at least when the blade plate below the rotating shaft 121 is located in the water and the water level of the water channel 2 is equal to or higher than the set water level Lb. The substantially entire body is disposed in the water. For this reason, when all of the water shielding blades 122 and 123 and the water intake restriction blades 124 and 125 are located in water, the forces acting on the water shielding blades 122 and 123 and the water intake restriction blades 124 and 125 are different. It is like that. That is, since the water intake restriction blades 124 and 125 have the flow path S, the water pressure acts only on the area excluding the flow path S on the water intake restriction blades 124 and 125, The force acting on 123 is greater than the force acting on the water intake restriction vanes 124 and 125. Thus, when the water level in the water channel 2 is equal to or lower than the normal water level La, the turbine wheel 12 rotates counterclockwise, and any of the water shielding blades 122 and 123 and the intake restriction blades 124 and 125 is caused by the rising water level. When the water is located underwater, the water turbine gate 12 can be moved in the clockwise direction by water pressure.

  Stoppers 13 and 14 are provided on the inner surface of the upstream opening 111 of the water intake body 11. The stoppers 13 and 14 are provided so as to be able to come into contact with the water turbine gate 12, and as shown in FIGS. 3 and 4, allow the water turbine gate 12 to rotate counterclockwise due to the flow of water, as shown in FIGS. As shown, the turbine wheel 12 has a function of preventing reverse rotation. The upper stopper 13 is fixed to the top surface 113 of the water intake body 11, and has an upper door stop 131, a swing fulcrum 132, and a regulating body 133. The upper door stop 131 can swing only to the upstream side around the swinging fulcrum 132, and swinging to the downstream side is restricted by contact with the restricting body 133. Thereby, the waterwheel gate 12 can rotate counterclockwise, and reverse rotation is restricted. Further, the upper door stop 131 includes a heavyweight body 131 a provided at the front end portion and a cushioning material 131 b made of rubber or the like provided at a contact portion with the blade plate 123. The heavyweight body 131a is configured such that the upper door stop 131 is positioned below the swing fulcrum 132 by its own weight. The buffer material 131b has a function of increasing the water tightness of the contact portion between the water shielding blade 122 or the water shielding blade 123 and the stopper 13 in a state where the water wheel gate 12 is locked.

  The lower stopper 14 is fixed to the bottom surface 114 of the water intake body 11 and has a lower door stop 141, a swing fulcrum 142, and a regulating body 143. The lower door stop 141 can swing only to the downstream side around the swinging fulcrum 142, and swinging to the upstream side is restricted by contact with the restricting body 143. Thereby, the waterwheel gate 12 can rotate counterclockwise, and reverse rotation is restricted. Further, the lower door stop 141 includes a buoyancy body 141 a provided at the front end portion and a cushioning material 141 b made of rubber or the like provided at a contact portion with the blade plate 125. The buoyancy body 141 a is configured such that the lower door stop 141 is positioned above the swing fulcrum 142 by the buoyancy. The buffer material 141b has a function of increasing the water tightness of the contact portion between the intake restriction blade plate 124 or the intake restriction blade plate 125 and the stopper 14 in a state where the water turbine gate 12 is locked.

  As shown in FIG. 1, a generator 22 is connected to the water turbine gate 12 having such a configuration through a power transmission means 21 such as a belt. The electric power from the generator 22 is supplied to the dust remover 23 arranged on the upstream side of the water intake body 11. The dust remover 23 has a function of removing foreign matter such as leaves and driftwood floating on the water surface, and prevents foreign matter from flowing to a power plant located on the downstream side of the water intake body 11. Yes.

  Next, a procedure for fixing the water intake device 1 to the water channel 2 will be described.

  The water intake device 1 is assembled in advance at a factory or the like, and is transported to an installation site after performing operation tests and adjustments. At the installation site, the existing intake gate 4 is raised to such an extent that the water intake device 1 can enter. And the water intake apparatus 1 is arrange | positioned directly under the water inlet gate 4, and the water intake gate 4 is lowered | hung until it adheres to the downstream of the upper surface 11b of the water body 11 in this state. In this way, the water intake device 1 is detachably fixed to the water intake 3 of the water channel 2. When the fixing of the water intake body 11 to the water channel 2 is completed, the gap adjusting members 7 and 8 are attached between the outer surface of the water intake device 1 and the side wall of the water intake gate 4 as shown in FIG.

  Next, the operation and action of the water intake device 1 will be described.

  When the water level of the water channel 2 is equal to or lower than the normal water level La, as shown in FIG. 3, only the blades 124 and 125 below the rotating shaft 121 are located in the water and receive pressure from the water, so that the water turbine gate 12 Rotates counterclockwise (forward rotation). Moreover, as shown in FIG. 4, even if the blades 122 and 124 come into contact with the stoppers 13 and 14, the stoppers 13 and 14 are swung, whereby the turbine wheel 12 continues to rotate forward. When the turbine wheel 12 further rotates and the blades 122 and 124 do not come into contact with the stoppers 13 and 14, the stoppers 13 and 14 return to their original positions due to their own weight and buoyancy. In this way, the water turbine gate 12 continues to rotate forward, and an appropriate amount of water is taken.

  When the flow rate of the water W flowing through the water channel 2 increases due to heavy rain, the water level of the water channel 2 rises, and the water shielding blades 122 and 123 and the intake restriction blades 124 and 125 are located in water. Here, since the water intake restriction blades 124 and 125 have the flow path S, the water pressure acts on the water intake restriction blades 124 and 125 only in the area excluding the flow path S. , 123 is larger than the force acting on the intake restriction blades 124, 125. As a result, the water turbine gate 12 rotates reversely, and as shown in FIG. 6, the water shielding blade 123 contacts the stopper 13 and the water intake restriction blade 125 contacts the stopper 14, and the rotation of the water turbine gate 12 is locked. Is done. In this state, the water W flowing in the water intake body 11 passes only through the water intake restriction vane plate 125, and an appropriate amount of water is taken.

  Thereafter, when the water level of the water W flowing through the water channel 2 decreases and the water level of the water channel 2 again becomes equal to or lower than the normal water level La, the water turbine gate 12 rotates again counterclockwise.

  In this way, when the water level of the water channel 2 is equal to or lower than the normal water level La, the water turbine gate 12 rotates forward by the water flow, and when the water level of the water channel is equal to or higher than the set water level Lb, the water wheel gate 12 reverses due to the acting water pressure. The rotation is locked by the contact with the stoppers 13 and 14.

  In this embodiment, as described above, the water intake at the time of rising the water level is performed through the intake restriction blades 124 and 125, so that the water flow rate is reduced to a predetermined amount or less only in the intake restriction blades 124 and 125. What is necessary is just to ensure the flow path S to restrict | limit and the design of the water intake apparatus 1 becomes easy. In other words, since the flow rate of water can be limited to a predetermined amount or less with a simple structure, there are few failures, the decrease in water intake can be minimized, and river water can be used effectively. Furthermore, it is possible to effectively use clean energy and contribute to the reduction of environmental load.

  As described above, according to the water intake device 1, the water turbine gate 12 is rotated in the reverse direction by the water pressure acting on the water shielding blades 122 and 123 and the water intake restriction blades 124 and 125, so that the stoppers 13 and 14 are brought into contact with each other. Since the rotation is locked by contact, the flow rate of water passing through the water intake restriction blade 125 is limited to a predetermined amount or less, and even when the water level in the water channel 2 rises, an appropriate amount of water can be taken. Therefore, even if the water level in the water channel 2 rises significantly, it is possible to ensure compliance with the laws regarding the amount of water taken. In addition, since the rotation direction of the water turbine gate 12 is switched using the change in the water level of the water W flowing through the water channel 2, no power source is required to adjust the water intake, and it is also used in mountainous areas where it is difficult to secure a power source. Is possible.

  Since the water intake body 11 is fixed to the water channel 2 by being pressed by the existing water intake gate 4, the repair work of the water channel 2 itself becomes unnecessary, and the construction period can be shortened and the installation cost can be reduced. Furthermore, since the power can be obtained by the generator 22 connected to the water turbine gate 12, even if there is no external power, for example, driving of the dust remover 23 installed on the upstream side of the water intake body 11, Information communication with operation, lighting, and management center is also possible.

(Embodiment 2)
FIG. 7 shows a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is the configuration of the intake restriction vane plate 126, and the other parts are the same as those of the first embodiment. Therefore, the description of the conforming part is omitted.

  The intake restriction blade 126 (127) has a plurality of small holes (flow paths) T in the plate-like body, and restricts the flow rate of the water W passing through the intake body 11 to a predetermined amount or less. That is, the water intake restriction vanes 126 and 127 are configured such that the flow rate (water intake amount) of the passing water W is equal to or less than a predetermined amount, that is, the allowable water intake amount (legal quantification) or less in a state where the rotation of the water turbine gate 12 is locked. In addition, the area of the flow path T is set. In this embodiment, the area of the flow path T is ensured by appropriately selecting the diameters and intervals of the small holes of the water intake restriction vanes 126 and 127. The intake restriction blade plates 126 and 127 and the water shielding blade plates 122 and 123 are attached to the rotating shaft 121 with a predetermined interval.

  In the second embodiment, since the area of the flow path T is ensured by appropriately selecting the diameters and intervals of the small holes of the water intake restriction vanes 126 and 127, the flow rate can be easily adjusted.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the water turbine gate 12 has the water shielding blades 122 and 123 and the water intake restriction blades 124 and 125 at intervals of 90 °. The number and interval of the plates are not limited to the above. Further, only one of the stoppers 13 and 14 for preventing reverse rotation of the water turbine gate 12 may be provided.

DESCRIPTION OF SYMBOLS 1 Water intake device 2 Water channel 3 Water intake 4 Water intake gate 5, 6 Cushion body 7, 8 Crevice adjustment material 11 Water intake body 12 Waterwheel gate 13, 14 Stopper 21 Belt (power transmission means)
22 Generator 23 Dust remover 122, 123 Water shielding blade (blade)
124, 125 Water intake restriction blade (blade)
La Normal water level Lb Set water level S Flow path

Claims (4)

A water intake device that is provided in a water channel and maintains a flow rate of water flowing through the water channel below a predetermined amount,
A water intake body having a flow path fixed to the water channel and through which the total amount of water flowing through the water channel passes;
A turbine wheel having a vane plate rotatably supported by the water intake body and restricting a flow rate of water passing through the water intake body to a predetermined amount or less;
A stopper that is provided so as to be in contact with the water wheel gate, allows rotation of the water wheel gate due to the flow of water, and prevents reverse rotation of the water wheel gate;
With
When the water level of the water channel is below the normal water level, the water wheel gate rotates by the water flow of the water channel, and when the water level of the water channel exceeds a set value, the water wheel gate is reversed by the water pressure acting on the blades. A water intake device characterized in that the rotation is locked by rotation and contact with the stopper, and the flow rate of water passing through the blade plate in contact with the stopper is not more than a predetermined amount.   The water intake device according to claim 1, wherein the water intake body is fixed to the water channel by being pressed by an existing water intake gate. The vane plate of the turbine wheel gate includes a water-impervious vane plate that prevents passage of the water, and a water intake restriction vane plate that has a flow path that restricts the flow rate of water passing through the water intake body to a predetermined amount or less. ,
The water shielding blade plate and the water intake restriction blade plate are provided so as to face each other with respect to the rotation center of the water turbine gate, and the stopper is at least of the water shielding blade plate and the water intake restriction blade plate. The water intake device according to claim 1, wherein the water intake device can contact either one.   The water intake device according to any one of claims 1 to 3, wherein a generator is connected to the turbine wheel gate.

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