JPH11256555A - Device utilizing hydraulic power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize water running in a channel wherein the amount of flow is small. SOLUTION: In a running water course 11, fixed gates 21, 21 are provided and a movable gate 20 is openably and closably provided in a gap between the fixed gates 21, 21 to block the running water course 11 when closed to block waterflow and to permit flow in the gap portion of the running water course 11 when open. A gate opening/closing mechanism 30 is connected to the movable gate 20. The gate opening/closing mechanism 30 comprises a weight 34 connected to a lever via a wire 33 wound on a pulley 32. When the amount of water retained in the upstream side reaches a predetermined opening level of water or higher, the movable gate 20 is turned over by hydraulic pressure applied to the movable gate 20 to open the water course to the gap portion, and is restored to a closed position by the weight 34 at or below a predetermined closing level of water which is lower than the opening level of water. A hydraulic turbine device 40 is provided downstream of the movable gate 20, and when the movable gate 20 is open, the device 40 moves up and down according to the level of water to convert the energy of the running water into motive power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power unit for converting hydraulic energy into power, and more particularly to a hydraulic power unit capable of extracting power by using flowing water energy in a river or drainage channel with a small flow rate. is there.

[0002]

2. Description of the Related Art Generally, in rivers and agricultural irrigation canals,
In order to take out the power by using flowing water energy, a pouring water turbine or the like is installed in the water channel. When the flow rate in the water channel is large and sufficient to maintain the rotational force of the water turbine, the power can be easily taken out by the flowing water turbine.

[0003]

However, if the flow rate of the water channel is reduced and the rotational force of the water turbine is lost, the flowing water energy cannot be used by the pouring water wheel even if there is some water flow. In many rivers and drainage channels with low flow rates, the flow rate may increase relatively during rainfall or during times of heavy drainage, but the flow rate is usually low and it is difficult to rotate the turbine with running water energy. It is.
In addition, rivers and drainage channels have large fluctuations in flow rate and water level, and have large cross-sections of water.Therefore, there is a problem that it is not possible to efficiently convert flowing water energy into motive power with a flowing water turbine installed in a channel. .

[0004] The present invention has been made to eliminate the above problems, and an object of the present invention is to provide a hydraulic power utilization device capable of efficiently utilizing a small flow of water flowing through a water channel.

[0005]

According to the present invention, there is provided a water power utilization apparatus which closes a flow channel when the amount of water stored on the upstream side is equal to or less than a predetermined value and stops the flow of water when the upstream reaches a predetermined storage amount. It is provided with damming means for opening a road, and motive power conversion means provided downstream of the damming means and converting flowing water energy into motive power.

In the hydraulic power utilization apparatus according to the present invention, the flow channel is closed by the blocking means to block the water flow, and water is stored upstream of the blocking means. When the upstream reaches a predetermined storage amount, a water channel is opened by the damming means, and the stored water rapidly flows downstream from the damming means. Water flowing downstream is converted into motive power by power conversion means and taken out. When the amount of water on the upstream side of the damming means decreases and falls below a predetermined value, the damming means closes the flowing water channel again and repeatedly opens and closes the flowing water channel according to the amount of stored water. For this reason,
Power is intermittently taken out by the power conversion means.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 are side views each showing a hydraulic power utilization device according to an embodiment of the present invention,
It is a front view, a plan view, and a rear view. As shown in FIG. 1, the hydraulic power utilization device 10 according to the present embodiment is provided in a water channel 11 having a small flow rate.

[0008] hydroelectric utilization device 10, as shown in FIGS. 1 to 4, the movable arranged along the width direction from the bottom portion 11A of the channel 11 at a predetermined height H ₁ and fixed gate (damming means) 20 , 21 and these gates 20, 21 are connected to the movable gate 20, and when the movable gate 20 is closed, the amount of water stored upstream of the gates 20, 21 reaches a predetermined opening water level or higher. A gate opening / closing mechanism (damming means) 30 for opening the movable gate 20 to reduce the amount of stored water and closing the movable gate 20 at a predetermined closing water level lower than the opening water level and below the closing water level; A water turbine device (power conversion means) 40 provided downstream of the movable gate 20;

Fixed gates (fixed weirs) 21 are installed on both sides of the water channel 11 as shown in FIG. Movable gate 20
Is installed between the fixed gates 21 and 21 so as to be openable and closable, and closes a gap formed between the fixed gates 21 and 21 when closed, and opens this gap when opened.
As shown in FIGS. 1 and 3, each of these gates 20 and 21 is provided such that the upper portion is inclined to the downstream side. The height H ₁ of each of the gates 20 and 21 is such that a large amount of flowing water can easily pass over the gates 20 and 21 when a large amount of water flows into the water channel 11 such as during heavy rain. The movable gate 20 is, as shown in FIG.
Shaft 22 that is rotatably mounted on the vehicle via a bearing 23
And an opening / closing plate 24 whose lower part is welded to the shaft 22 and can swing integrally with the shaft 22. Also, axis 2
A lever 25 is attached to the shore end of the second water channel 11 so as to be inclined substantially in the same manner as the opening / closing plate 24 so as to move integrally with the opening / closing plate 24.

[0010] closing plate 24, as shown in FIGS. 1 to 3, when tilted, in contact with both sides of the fixed gate 21 damming waterways 11 at a predetermined height H _1, a fall in the downstream A water channel is formed between the fixed gates 21 and 21 to allow water on the upstream side to flow downstream. FIG. 9 shows the fixed gates 21 and 21 at the movable gate 20 side end.
A guide 26 is provided as shown in FIG. These guides 26, 26 prevent the water flowing out of the gap generated between the fixed gates 21, 21 and the opening / closing plate 24 when the opening / closing plate 24 of the movable gate 20 swings from the closed position toward the open position. Guided downward from the lateral direction, this water flow gives the urging force to the opening / closing plate 24 in the opening direction,
The opening of the movable gate 20 is assisted.

As shown in FIGS. 1 to 4, the gate opening / closing mechanism 30 includes a pulley 32 attached to the ceiling 12 of the water channel 11 and a wire 33 having one end connected to the lever 25 and wound around the pulley 32. And a weight 34 exchangeably connected to the other end of the wire 33. The gate opening / closing mechanism 30 is configured such that when the amount of stored water stored on the upstream side of each of the gates 20 and 21 is small, the lever 25 is pulled upward by the weight of the weight 34 via the wire 33 so that the opening / closing plate 24 is fixed to the fixed gate 21. , 21 so that the water channel 11 is blocked by the movable gate 20 and the fixed gates 21, 21. In addition, the gate opening / closing mechanism 30 is configured such that the movable gate 20 and the fixed gates 21, 21 block the water channel 11, the accumulated water accumulates on the upstream side, the water level rises, and the water pressure overcoming the load of the weight 34 is changed by the opening / closing plate 24.
, The opening / closing plate 24 is caused to fall to the downstream side by the water pressure. When the opening / closing plate 24 falls, the weight 34 is pulled up by the lever 25. The gate opening / closing mechanism 30 includes the opening / closing plate 24.
When the water pressure acting on the lever decreases to a predetermined value or less, the lever 25 is pulled upward by the load on the weight 34 side, and the opening / closing plate 24 is returned to the closed position.

The waterwheel device 40 is a float-type water-flowing waterwheel, and as shown in FIGS. 1, 4 and 6, its upper end is swingably supported by a support member 47 attached to the ceiling 12 of the waterway 11. Frame body 46, a water wheel axle 42 whose both ends are rotatably supported by the frame body 46 via bearings 46 A, rotating plates 43 integrally attached to left and right sides of the water wheel axle 42, A large number of blades 44 are attached to the outer peripheral side of the plate 43 at predetermined intervals and have a hollow structure inside. These water turbine body 42, 43, 44 side,
As shown in FIG.
Located downstream of At the lower end of the frame 46, a gantry 41
Is attached. The gantry 41 is a bottom 11A of the water channel 11.
To provide a gap between the water wheel main body 42, 43, and 44. When the water wheel main body 42, 43, 44 side rises in accordance with the rise of the water level, it separates from the bottom 11A, and together with the frame body 46, It rises integrally with the 43 and 44 sides.

The supporting member 47 is provided with water turbine main bodies 42, 43, 44.
It is attached to the ceiling 12 on the upstream side from the side. The shaft 48 is rotatably supported by the support member 47. Water shaft 42 and shaft 4
8 are provided with sprockets 45 and 49, respectively, and a chain 50 is wound around these sprockets 45 and 49. As shown in FIGS. 2 and 3, the shaft 48 is further provided with another sprocket 51 so as to output the rotational driving force of the shaft 48 to the outside via the chain 52. When the impeller 44 receives the force of flowing water flowing from the upstream side, the water turbine device 40 transmits the force to the water wheel shaft 42 via the rotating plate 43 to drive the water wheel shaft 42 to convert the flowing water energy into rotational driving force. The rotational driving force is output to the outside via the chains 50 and 52. When the water level rises, the water turbine main bodies 42, 4
The 3 and 44 sides float with the gantry 41 in accordance with the water level, and the frame 46 also rotates about the end of the support member 47 side as the water turbine bodies 42, 43 and 44 float and floats.
The 44-side end rises.

The operation of the hydraulic power unit 10 according to the above embodiment will be described. When the amount of water flowing through the water channel 11 is small and almost no water pools on the upstream side of the gates 20 and 21, no water pressure is applied to the opening / closing plate 24 of the movable gate 20 on the surface on the upstream side. Is pulled upward. With the movement of the lever 25, the opening / closing plate 24 of the movable gate 20 also rotates upstream about the shaft 22 and comes into contact with the inclined end of the fixed gate 21 to be stopped.
The gap formed therebetween is closed. At this time, the movable gate 20 and the fixed gates 21 and 21 are connected to the waterway 11 by the waterway 1.
1 is blocked and a weir with a height H ₁ is formed in the water channel 11.

The flowing water gradually flows into the upstream side of the weir,
When the pooled water accumulates on the upstream side and the water level rises, and the water pressure that overcomes the load of the weight 34 acts on the open / close plate 24, the open / close plate 24 falls down due to the water pressure, and the weight 34
Is pulled up by the lever 25. When the opening / closing plate 24 is opened from the closed position, if the opening / closing plate 24 is slightly opened, flowing water flows from the gap to the fixed gate 21,
It is swept downward by the guide 26 of 21. For this reason, a force in the falling direction is applied to the opening / closing plate 24 so that the opening / closing plate 24 falls at a stroke. When the opening / closing plate 24 falls over and the water channel is opened by the gap between the fixed gates 21, 21, the water stored on the upstream side of the fixed gates 21, 21 rapidly flows out from this water channel to the downstream side, and the water turbine main body of the water turbine device 40. 42, 43, and 44 convert flowing water energy into rotational force. The rotational driving force is taken out to the outside via the chains 50 and 52, and is used as a drive source of a power unit such as a dust remover. Opening / closing plate 2
When the water wheel 4 is opened, the amount of water flowing around the water turbine main bodies 42, 43, 44 is large and the water level rises, so that the float type water turbine main bodies 42, 43, 44 float together with the gantry 41 in accordance with the water level, and the frame 46 is With the floating of the main bodies 42, 43, 44, the ends of the water turbine main bodies 42, 43, 44 are raised. When the water level gradually decreases, the water turbine main bodies 42, 43, and 44 also lower according to the water level. That is, the water turbine device 40 follows the fluctuation of the water level. For this reason, the water turbine device 40
Is capable of converting running water energy into rotational force even if the water level fluctuates.

When the water level on the upstream side of the fixed gates 21 and 21 decreases and the water pressure acting on the open / close plate 24 decreases to a predetermined value or less, the weight of the weight 34 causes the lever 25 to move again.
Is pulled upward, and the opening / closing plate 24 returns to the closed position. As described above, the hydraulic power utilization device 10 according to the present embodiment is, for example, a water channel 11 having a small flow rate.
Even if a small amount of flowing water is stored, a small amount of flowing water can be used effectively because the water channel is intermittently opened to convert the flowing water energy into driving force. Further, since the lever 25 is disposed on the downstream side of the fixed gate 21, there is no possibility that dust or the like may be caught on the lever 25 when the opening / closing plate 24 is opened. Further, the power obtained by the above-mentioned hydraulic power utilization device can be used, for example, as the power of a dust remover for removing dirt in a water channel, the power of a stirring device for purifying water in a water channel and a reservoir, and the like. Since the water flow in the water channel is used, no running cost is required, and the maintenance cost for various devices is reduced.
In addition, since the water is always running when the water is flowing, no labor is required and the management labor can be reduced. Furthermore, since the structure is simple, there are few failures and long-term use is possible.

FIGS. 7 and 8 relate to another embodiment of the present invention. A movable gate 12 for closing a gate as a damming means at a predetermined height H ₂ in a width direction of a water channel 111 is shown.
It is composed of only 0. The movable gate 120 is provided on the wall-side rubber sheet 1 attached to both wall surfaces of the waterway 111.
21, 122, and these wall-side rubber sheets 121, 12
The lower part of the waterway 111 is provided at an angle between the two.
A stainless steel plate 124 swingably connected to a swing rubber sheet 123 fixed to A, and a seal affixed to the back surface of the stainless steel plate 124 so that both ends in the width direction slide with the wall surface side rubber sheets 121, 122. And a rubber sheet 124A. Two holes 125 are formed in the upper portion of the stainless steel plate 124, and a gate opening / closing mechanism 130 is connected to the holes 125. The gate opening / closing mechanism 130 is provided in the waterway 1 similarly to the above-described embodiment.
Pulley 132, which is mounted above
25 and the wire 1 wound around the pulley 132
33 and a weight 134 that is replaceably connected to the other end of the wire 133. In the hydraulic device according to this embodiment, the stainless steel plate 124 is securely sealed and closed, so that the movable gate 120
The flowing water stored upstream does not leak to the downstream side, and the flowing water can be used without waste.

FIG. 10 shows a modification of the gate opening / closing mechanism. An adjusting arm 233 which is welded to the shaft 22 of the movable gate 20 shown in the above embodiment and extends to the upstream side is fitted to the adjusting arm 233. It is locked at a desired position on the adjusting arm 233, and when the opening / closing plate 24 is closed,
The weight 234 is in contact with the bottom 11A of the water channel 11. The gate opening / closing mechanism according to this modified example is such that when the opening / closing plate 24 is closed, flowing water gradually flows upstream to raise the water level, and when the water pressure that overcomes the load of the weight 234 acts on the opening / closing plate 24, the opening / closing plate 24 is closed. Is allowed to fall to the downstream side due to the water pressure, and when the water pressure applied to the opening / closing plate 24 becomes equal to or less than a predetermined value, the opening / closing plate 24 is returned to the original closed position. Note that both the gate opening / closing mechanism according to this modified example and the gate opening / closing mechanism described in the above embodiment may be used.

FIGS. 11A and 11B show an operation state of another modification of the gate opening / closing mechanism according to the embodiment. The pulley 332 is placed above the movable gate 20 on the downstream side. The auxiliary weight 335 is provided at a predetermined position above the weight 334 attached to the wire 333 wound around the pulley 332.
Are suspended. This auxiliary weight 335 is the weight 3
When the height is less than the predetermined height H ₃ , the weight is kept separated from the weight 334.
When it is positioned higher than ₃ , it is placed on the weight 334. Therefore, when the water level on the upstream side of the movable gate 20 decreases and the movable gate 20 returns to the closed position,
Since the load corresponding to the total weight of the weight 334 and the auxiliary weight 335 is applied to the movable gate 20, the return of the movable gate 20 is facilitated. In addition, in this other modified example, the weight 334 and the pulley 3
32, the auxiliary weight 335 is provided on the downstream side of the movable gate 20, but is not limited to this, and may be provided on the upstream side.

FIGS. 12 and 13 show another modification of the gate opening / closing mechanism. A storage section 434 is provided downstream of the upper ends of the opening / closing plates 24 and 124 of the movable gates 20 and 120. The storage section 434 is a storage section having an L-shaped cross section, and stores a predetermined amount of a water flow overflowing from the upper ends of the open / close plates 24, 124, and falls down the open / close plates 24, 124 on the downstream side by the weight of the stored water. Direction, and when the open / close plates 24 and 124 fall,
The stored water is released to the outside, and the open / close plates 24, 1
24 is easily returned.

FIG. 14 shows a modification of the storage section 434. The storage section 534 is made of vinyl, and the flow direction wall 535 is formed in a bellows shape. For this reason, the storage 534 made of vinyl is provided with the opening / closing plate 2.
4, 124, as the water flows in from the upper end, the bellows-like wall portion 535 extends, the upper opening increases in the opening / closing direction, and the volume increases in accordance with the amount of flowing water. When the opening / closing plates 24 and 124 fall, the stored water is discharged to the outside and the bellows-like wall 53
5 is contracted by the open / close plates 24, 124 and the water pressure. Then, with the bellows-like wall portion 535 contracted, the opening / closing plates 24 and 124 return to the closed position.

[0022]

As described above, according to the present invention, when the amount of water stored on the upstream side becomes equal to or less than a predetermined value, the flow channel is closed to block the water flow and when the upstream side reaches the predetermined storage amount, the flow channel is closed. By providing an open damming means and a power conversion means provided downstream of the damming means and converting flowing water energy into motive power, even if the flow path is small, the inflow water can be effectively reduced. Because it can be used,
The water resources can be used efficiently, and power can be supplied to other devices at low cost.

[Brief description of the drawings]

FIG. 1 is a side view showing a hydraulic power utilization device according to an embodiment of the present invention.

FIG. 2 is a front view of the hydraulic device of FIG. 1;

FIG. 3 is a plan view of the hydraulic device of FIG. 1;

FIG. 4 is a rear view of the hydraulic device of FIG. 1;

FIG. 5 is an explanatory view of a movable gate of the hydraulic device of FIG. 1;

FIG. 6 is an explanatory diagram of a main part of a water turbine device of the hydraulic power device of FIG. 1;

FIG. 7 is a side view showing a hydraulic device according to another embodiment of the present invention.

FIG. 8 is a plan view showing the hydraulic device of FIG. 7;

FIG. 9 is an explanatory view showing a guide of the hydraulic device of FIG. 1;

FIG. 10 is an explanatory view showing a modified example of the gate opening / closing mechanism of the hydraulic power utilization apparatus of FIG. 1;

FIGS. 11A and 11B are explanatory diagrams showing the operation states of another modified example of the gate opening / closing mechanism of the hydraulic power device of FIG. 1;

FIG. 12 is a cross-sectional view showing another modified example of the gate opening / closing mechanism of the hydraulic device of FIG. 1 or FIG. 7;

FIG. 13 is a perspective view showing a storage section of the gate opening / closing mechanism of FIG.

FIG. 14 is a perspective view showing a modification of the storage section of the gate opening / closing mechanism of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hydropower utilization device 11 Waterway (running waterway) 20 Movable gate (gate) 21 Fixed gate (gate) 30 Gate opening / closing mechanism 40 Waterwheel device

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[Procedure amendment]

[Submission date] April 8, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the present invention, there is provided a water power utilization apparatus comprising: a fixed portion having an upper portion inclined downward in a flowing water channel;
Swinging around the fixed gate and the axis arranged in the width direction at the bottom of the water channel.
Movably mounted and flushed with a fixed gate when closed
Block the channel and block the water flow.
Movable gate that allows the flow in the gap caused by opening
And a wire wound around a pulley around this movable gate.
Connected and stored upstream of the closed movable gate
Movable water gate when the amount of water
For the specified closing below the opening water level
The weight that closes the movable gate below the water level and the movable gate
A water turbine installed downstream that converts running water energy into power
Device and fixed gate, movable gate is in open position
Between the fixed gate and the movable gate when swinging toward
Guides the water flowing out of the gap created in
And a guide to help open the moving gate .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006] In the hydraulic device according to the present invention, the movable game
The water channel is closed by the water to block the water flow, and water is stored upstream of the movable gate . Upstream reached the predetermined storage amount,
When the weight of the weight is overcome, the movable gate moves downstream due to water pressure.
Swings waterway is opened, the fixed gain accumulated water from the movable gate
To the guide from the space between the gates and flows rapidly downstream. The water flowing downstream is extracted by converting the water energy into power by a water turbine device . When the amount of water on the upstream side of the movable gate decreases and becomes equal to or less than a predetermined value, the movable gate closes the flowing water channel again due to the weight of the weight, and repeatedly opens and closes the flowing water channel according to the amount of stored water. Therefore, power is intermittently taken out by the water turbine device .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

FIG. 10 shows a modification of the gate opening / closing mechanism. An adjusting arm 233 which is welded to the shaft 22 of the movable gate 20 shown in the above embodiment and extends to the upstream side is fitted to the adjusting arm 233. It is locked at a desired position on the adjusting arm 233, and when the opening / closing plate 24 is closed,
The supporting weight 234 is in contact with the bottom 11A of the water channel 11. The gate opening / closing mechanism according to this modified example is configured such that when the opening / closing plate 24 is closed, flowing water gradually flows into the upstream side to raise the water level, and when a water pressure that overcomes the load of the assisting weight 234 acts on the opening / closing plate 24, The opening / closing plate 24 is allowed to fall to the downstream side due to the water pressure, and when the water pressure applied to the opening / closing plate 24 becomes a predetermined value or less, the opening / closing plate 24 is returned to the original closed position. Note that both the gate opening / closing mechanism according to this modified example and the gate opening / closing mechanism described in the above embodiment may be used.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

As described above, according to the present invention, flowing water
A fixed gate with its upper part inclined downstream in the road
And swingable on an axis arranged in the width direction at the bottom of the water channel
Attached, closes the waterway with a fixed gate when closed
To block the water flow and open the cross section of the flowing water channel when it is open
A movable gate that allows the flow of the void portion caused by the
Connected to this movable gate via a wire wound around a pulley
Amount of water stored and stored upstream of the closed movable gate
When the water level exceeds the specified opening water level, the movable gate is opened.
Permissible and below the specified closing water level lower than the opening water level
With the weight that closes the movable gate and the downstream side of the movable gate
A water turbine device that is provided and converts running water energy into power,
Provided on a fixed gate, with the movable gate facing the open position
Between fixed gate and movable gate when swinging
A movable gate that guides the water flowing out of the gap in a predetermined direction
By having a guide to help open
Even if the flow rate is low, the pressure of the stored water can be
When the movable gate is open,
Is guided by the guide in a direction to help open the movable guide.
Therefore, the movable gate can be quickly turned over and the inflow water can be used effectively, so that water resources can be used efficiently and power can be supplied to other devices at low cost. There is an effect that can be done.

Claims (13)

[Claims] When the amount of water stored on the upstream side is equal to or less than a predetermined value, the flow channel is closed to block the flow of water. And a power conversion means provided on the downstream side for converting flowing water energy into power. 2. A gate which is provided in the flow channel so as to be openable and closable, closes the flow channel at the time of closing to block the flow of water, and allows a flow in a gap portion caused by opening of the flow cross section of the flow channel at the time of opening. When the amount of water connected to the gate and stored on the upstream side of the closed gate reaches a predetermined opening water level or higher, the gate is allowed to be opened, and the gate is closed at a predetermined closing water level lower than the opening water level. Gate opening and closing mechanism,
A water turbine provided downstream of the gate for converting flowing water energy into motive power. 3. The apparatus according to claim 2, wherein the gate comprises a fixed gate and a movable gate, and the water wheel device is disposed downstream of the movable gate. 4. The hydraulic power utilization device according to claim 2, wherein the gate opening / closing mechanism includes a weight connected to the movable gate via a wire wound around a pulley. 5. The hydraulic power unit according to claim 4, wherein the movable gate is swingably attached to a shaft arranged in a width direction of the flowing water channel. 6. The hydraulic power unit according to claim 5, wherein the fixed gate and the movable gate are provided such that the upper portions are inclined to the downstream side. 7. The fixed gate is configured to open a movable gate by guiding a water flow flowing out of a gap generated between the fixed gate and the movable gate when the movable gate swings toward an open position in a predetermined direction. 7. The device of claim 6, further comprising a guide to assist. 8. The gate opening / closing mechanism is disposed at a predetermined position above the weight, and is kept separated from the weight when the weight is below a predetermined height, and the weight is raised above the predetermined height. The hydraulic power utilization device according to claim 4, wherein an auxiliary weight placed on the weight is provided when it is located. 9. The gate opening / closing mechanism stores a water flow overflowing from the upper end of the movable gate downstream of an upper end of the movable gate whose upper part is inclined downstream, and discharges the stored water to the outside when the movable gate is opened. The hydraulic power unit according to claim 6, further comprising a storage unit. 10. The storage unit according to claim 9, wherein the storage unit has an extendable bellows-like wall whose upper opening increases in opening and closing direction, and whose volume increases in accordance with the amount of water flowing in. The hydropower device as described. 11. A gate opening / closing mechanism, which is attached to a movable gate side, extends upstream and moves integrally with the movable gate, and is attached to a desired position on the arm so as to be locked, and is movable when the movable gate is opened. The hydraulic power utilization device according to claim 6, wherein the gate is provided with a weight that applies a force for returning to a closed position. 12. A water turbine device, wherein a rotating blade portion for converting flowing water energy into rotational force has a hollow structure inside, and the water turbine device is a float type water turbine which moves up and down according to a fluctuation of a water level. The hydraulic power utilization device according to claim 2. 13. The hydraulic device according to claim 4, wherein the gate is swingably attached to a rubber sheet disposed in a width direction of the flowing water channel.