JP5705105B2 - Hydroelectric generator - Google Patents

Description

  The present invention relates to a small hydroelectric power generation apparatus installed in a waterway or a river having a relatively small flow rate or drop such as an agricultural or industrial waterway.

  Conventionally, there has been a small hydroelectric power generation device installed in an irrigation channel such as an agricultural or industrial channel. For example, the hydroelectric generator disclosed in Patent Document 1 has a frame installed on the bottom surface of a downstream waterway of a drop work such as an agricultural waterway, and the power generator such as a water turbine or a hydroelectric generator is located above the frame. It is provided so as to be detachable from. In this hydroelectric power generation device, a rotating shaft having a vertical shaft structure is attached to a reaction-type water turbine runner vane, and a generator is connected to the rotating shaft via a transmission mechanism. In addition, as disclosed in Patent Document 2, a hydroelectric power generation system in which a rectangular water storage tank is installed on the bottom surface of the downstream side of the head of the water channel, a fixed blade is provided below the water tank, and a power generation unit is installed thereabove. A device configuration has also been proposed.

JP-A-2005-320883 JP 2004-124829 A

  In the case of the above-mentioned background art, the hydroelectric generator and its fixed structure are constructed on the bottom surface of the head of the irrigation canal, which is troublesome and requires a lot of man-hours. In addition, the head of the irrigation canal varies greatly depending on the slope of the topography, and the head of water that can be used for hydropower generation cannot be set to a constant value. The design must be designed and constructed according to the installation location, and man-hours are required for the design and construction. Furthermore, the flow rate of the water flowing through the irrigation channel is not constant, so that it cannot flexibly respond to the change in the flow rate, and damage to the water conduit and the like is likely to occur due to the large flow rate at the time of water increase. In addition, when installing the power generation device main body, it may be impossible to carry in the completed power generation device main body depending on the installation location.

The present invention has been made in view of the above-mentioned problems of the background art, and is easy to install regardless of the shape of the drop head to be installed or a drop with a simple configuration, and can flexibly respond to changes in the installation environment. An object of the present invention is to provide a hydroelectric power generation device that can be used.

  The present invention includes a water intake barrel in which a central axis is provided vertically and water passes from the upper side to the lower side, a water throttle portion provided coaxially below the water intake barrel, and a lower portion of the water throttle portion. A power generator main body provided with a rotary screw provided and a generator coupled to a shaft fixed to the rotary screw; a frame holding the power generator main body; and the frame fixed The power generation device main body is suspended and fixed to the headway of the water channel by the beam member in a state where the frame body to which the power generation device main body is fixed is fixed to the beam member. It is a hydroelectric generator.

  The frame is formed in a rectangular shape, accommodates the power generation device main body, the upper ends of the frame are fixed to a pair of beam members, and the pair of beam members are pedestals installed on both sides of the water channel It is fixed to.

  On the downstream side of the rotary screw, there is a water conduit that allows the water that has passed through the rotary screw to flow, the water conduit is provided coaxially and telescopically with the rotary screw, and a float is provided on the lower end side of the water conduit. The lower end side of the water conduit is fixed by the float so as to be movable up and down by the amount of water in the water channel. The water conduit is formed by fitting a plurality of cylindrical bodies having different diameters so as to be slidable concentrically. Alternatively, the water conduit may be a bellows-like stretchable cylinder.

  Further, the intake cylinder is provided with an intake opening, the opening of the intake opening opens toward a water channel on the upstream side of the drop work, and the bypass opening through which the water flow is released to the outside of the intake cylinder Is formed. The bypass port may be provided with a lid member, and the lid member may be provided to be opened and closed by a motor operated by a water level gauge.

According to the hydraulic power unit of the present invention, since the power generation device main body is installed in the waterway hung on the beam member, can be installed hydraulic power unit without installing a structure to the bottom surface or the like of the drop Engineering during construction It is extremely easy to install. Moreover, it can be constructed regardless of the size of the drop head, and the installation location is not limited.

  Further, the expansion / contraction of the water conduit can ensure that the water conduit is positioned on the water surface downstream of the drop head. In addition, water guides follow the water level above and below, and can flexibly respond to changes in the installation environment. When the amount of water increases, the water guides become shorter, and the lateral flow applied to the water guides by the water flow is reduced. The increase in power can be suppressed and damage to the power generator body can be prevented.

  In addition, the intake port is provided with a bypass port, so that when the flow rate is large or the power generator main body is inspected, the water flow can be prevented from entering the intake cylinder, and safety and maintainability are good.

It is a longitudinal cross-sectional view of the hydraulic power unit of 1st embodiment of this invention. It is a top view of the hydroelectric generator of this embodiment. It is a partial expanded longitudinal cross-sectional view which shows a rotary screw part from the water throttle part of the hydroelectric generator of this embodiment. It is a partial fracture perspective view of a hydroelectric generator except a float part of this embodiment. It is a perspective view of the hydroelectric generator of this embodiment. It is a partial exploded perspective view of the hydroelectric generator of a second embodiment of this invention. It is a disassembled perspective view which shows the structure of the hydraulic power unit of 2nd embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention. A hydroelectric generator 10 according to this embodiment includes a pedestal 13 on a concrete shore 12a where a drop work 14 of a water channel 12 is formed. It is installed so that it may be suspended by a pair of beam member 16 spanned through. The shape of the pedestal 13 is appropriately designed and installed in a rectangular or triangular shape according to the shape of the both banks 12a in order to adjust the inclination and height of the both banks 12a.

  An upper end 20a of a metal frame 20 assembled in a rectangular shape is fixed to the steel beam member 16 with a bolt 17, and in the frame 20, a cylindrical power generator main body 11 is fixed with a bolt or the like. It is fixed integrally. In the power generation apparatus main body 11, the upper end of a water intake drum 22 described later is fixed to the upper end portion 20 a of the frame body 2, and the lower end of the water intake drum 22 is fixed to the lower end portion 20 b of the frame body 16.

  The power generation device main body 11 has a cylindrical intake drum 22, and an end portion is placed on the upstream bottom surface 14 a of the drop work 14 at a position slightly closer to the middle than above the intake drum 22, and toward the upstream side. A water intake 26 having an opening in the horizontal direction is connected. The opening of the water intake 26 is formed in a quadrangular shape, and a water level gauge 27 that detects the water level of the water channel 12 is provided on one side surface of the water intake 26.

  On the lower surface of the water intake 26, an overflow bypass port 28 that can be opened toward the downstream bottom surface 14b of the drop head 14 is provided so as to be freely opened and closed. The bypass port 28 is provided with a lid member 28 a, the lid member 28 a is connected to a motor 30 via an opening / closing connecting member 31, and the bypass port 28 is provided so as to be freely opened and closed by the motor 30. The motor 30 is fixed on a mounting member 29 spanned between both banks 12a, and a water level gauge 27 is connected to a control unit (not shown). The water level of the water channel 12 is detected by the water level gauge 27, and a water depth above a certain level. Then, the control unit is provided to operate the motor 30 to open the bypass port 28.

  A water throttle portion 32 is coaxially fixed to the lower end opening of the intake drum 22. The water squeezing part 32 is provided with a cylindrical circular truncated conical water squeezing outer cylinder 34 whose large diameter part is fixed to the lower end part of the intake cylinder 22. A screw pipe 36, which will be described later, is attached to a small diameter portion which is the lower end of the water throttle outer cylinder 34. A water squeezing drum 33 for narrowing the cross-sectional area of the flow path is provided on the central axis inside the water squeezing outer cylinder 34 of the water squeezing part 32. The water squeezing drum 33 has a central axis that is coaxial with the intake cylinder 22 and is formed of a truncated cone portion having a diameter that increases downward and a cylindrical portion that continues to the large diameter portion.

  A plurality of fixed guide vanes 40 are provided between the water throttle outer cylinder 34 of the water throttle unit 32 and the water throttle drum 33. The fixed guide vane 40 divides the space in the water throttle outer cylinder 34 in the water throttle part 32 at substantially equal intervals in the radial direction. The inner side edge portion of each fixed guide vane 40 is fixed to the side surface of the cylindrical portion of the water squeezing drum 33, and the opposite side edge portion of the fixed guide vane 40 is the inner peripheral surface of the water squeezing outer tube 34. It is fixed to. The other pair of side edge portions of each fixed guide vane 40 is positioned above and below in the flow path direction and exposed in the space on both the upper and lower sides of the water throttle portion 32.

  The mounting angle of each fixed guide vane 40 is inclined in the range of about 20 degrees to 35 degrees with respect to the central axis direction of the water throttle portion 32. Preferably, it is attached within a range of about 25 degrees to 30 degrees. This inclination direction is inclined so as to proceed clockwise in the downward direction. Further, the inclination angle is provided so as to intersect at a substantially right angle with respect to the upper surface of a rotary screw 38 to be described later. Here, the right angle includes an angle of around 90 degrees, and an angle slightly larger than 90 degrees is preferable.

  A screw pipe 36 is coaxially fixed to the small diameter part below the water throttle part 32, and a rotary screw 38 composed of, for example, four rotary blades fixed to a rotary cylinder 39 is rotatably provided in the screw pipe 36. It has been.

  A cylindrical water conduit 42 is provided below the screw pipe 36 to which the rotary screw 38 is attached. The water conduit 42 is formed by fitting a plurality of cylindrical bodies having different diameters so as to be slidable concentrically, and the upper end edge of the upper cylinder 42 a is fixed to the lower end edge of the screw pipe 36. The number of divisions of the water conduit 42 is, for example, divided into three stages of an upper cylinder 42a, a middle cylinder 42b, and a lower cylinder 42c. The inner diameter of the middle cylinder 42b is substantially equal to the outer diameter of the upper cylinder 42a, and the middle cylinder 42b. Is substantially equal to the inner diameter of the lower cylinder 42c. Thereby, the lower part of the upper stage cylinder 42a and the middle stage cylinder 42b are accommodated in the lower stage cylinder 42c, and are formed to be contractible. The upper cylinder 42a, the middle cylinder 42b, and the lower cylinder 42c are each provided with a stopper 43 at the end thereof, formed so as not to be separated from each other even when extended, and formed to be extendable and contractable in a substantially watertight state.

  An annular float 44 is fixed to the outside of the lower cylinder 42c. The float 44 is formed of foamed resin or the like, and a pair of guide bars 46 provided in the vertical direction protrude through the holding member 45 in the vertical direction. The guide bar 46 is inserted through a fixed guide 48 attached to the lower end 20b of the frame body 20, and is provided to be slidable in the vertical direction. The buoyancy of the float 44 has sufficient buoyancy to float the middle tube 42b and the lower tube 42c, and is provided so as to be able to float on the water surface of the water channel 12 at all times.

  A bearing portion 37 is provided at the center of the rotating screw 38, and a shaft 50 is fixed to the rotating cylinder 38 on the center side of the rotating screw 38 integrally with the rotating screw 38 and the rotating cylinder 39. The shaft 50 is fixed through the rotary cylinder portion 39 of the rotary screw 38, extends vertically above the rotary cylinder portion 39, and rotates in a through hole formed coaxially with the water throttle drum 33 of the water throttle portion 32. It is inserted so as to be able to extend further upward and reaches the upper end 20 a of the frame 20.

  The upper end portion of the shaft 50 passes through a bearing 51 fixed to the upper end portion 20 a of the frame body 20 and is connected to the joint member 54. The joint member 54 is connected to the rotation shaft of the speed increaser 56, and the rotation shaft of the speed increaser 56 is connected to the rotation shaft of the generator 60 via the joint member 58. The step-up gear 58 is fixed on a housing 62 installed on the upper end 20 a of the frame body 20, and the generator 60 is installed on the housing 62. An intermediate portion of the shaft 50 is rotatably accommodated in a cylindrical body 64 fixed to the water squeezing drum 33 in the intake drum 22. The upper end portion of the cylindrical body 64 that houses the shaft 50 is connected to the bottom surface of the mounting plate 63 to which the housing 62 is fixed, and the lower end portion of the cylindrical body 64 is connected to the upper end portion of the water squeezing drum 33 in a watertight manner. . The lower end portion of the shaft 50 is pivotally supported by the thrust bearing 53.

  Next, the installation method of the hydroelectric generator 10 of this embodiment is demonstrated. In the water channel to which the hydroelectric generator 10 is attached, the water channel 12 is made of concrete, and both banks 12a of the pair of side walls are also made of concrete. First, pedestals 13 are installed on both banks 12a of the water channel 12 where the drop work 14 is formed. On the other hand, the power generation device main body 11 is fixed to the frame body 20, and the beam member 16 is fixed to a pair of side surfaces of the frame body 20 that face each other. The beam member 16 is longer than the width of the water channel 12 and has a length that can be fixed to the base 13. The side surfaces to which the beam member 16 is fixed are the side surface from which the water intake 26 protrudes from the frame body 20 and the opposite side surfaces. When installing, the power generator main body 11 fixed to the frame body 20 is suspended by a crane (not shown) on the side of the water channel 12 where the drop work 14 is located, and both ends of the beam member 16 are placed on the upper surface of the base 13. Then, the both ends of the beam member 16 are fixed to the base 13. Thus, the installation of the hydroelectric generator 10 in the water channel 12 is completed.

  In addition, when a crane cannot be carried to the location of the head work 14 of the water channel 12, the power generator main body 11 is disassembled and carried into the site, the frame body 12 is assembled at the site, and the beam member 16 is placed between the bases 13. The frame body 20 may be installed in a suspended state by assembling the frame body 16 on the beam member 16, and thereafter, the components of the power generation apparatus main body 11 may be assembled in the frame body 20 in order.

  Next, the operation of the hydroelectric generator 10 will be described. The water flowing through the water channel 12 flows into the water intake drum 22 from the water intake 26, the flow path is throttled by the water throttle 32, and the flow velocity increases. The direction of the flow of the water flow with the increased flow velocity is regulated by the fixed guide vane 40 and flows down toward the extension line of the fixed guide vane 40. The position where it flows down is a position where it hits the blade surface of the rotary screw 38 substantially perpendicularly.

  The water whose flow velocity is increased by the water throttling portion 32 from the water intake barrel 22 collides with the blade of the rotary screw 38, and the blade is pushed, and the rotary screw 38 rotates around the rotary cylinder portion 39. At this time, the fixed guide vanes 40 of the water throttling part 32 form flow paths in which the water flow is divided, and hit the blades of the rotary screw 38 positioned below. Each blade of the rotary screw 38 receives the water flow from the water constricting part 32 at a surface at a slightly larger angle than the perpendicular direction, and effectively converts it into rotational energy.

  The water flow that has passed through the rotary screw 38 passes through the water conduit 42 and joins the water channel 12 on the downstream side of the drop head 14. The drop at this time is a difference in height from the water surface of the water channel 12 upstream of the drop work 14 to the water surface downstream of the drop work 14. Further, when the amount of water in the water channel 12 increases, the float 44 of the water conduit 42 floats on the water surface, so the position of the water surface on the downstream side of the drop work 14 always changes, and this hydroelectric generator 10 can be used. The amount of potential energy of the water flow is potential energy due to the difference between the position of the water surface where the float 44 floats and the position of the upstream water surface or the upper surface of the water intake 26. Furthermore, the velocity energy due to the water flow rate in the water channel 12 can also be used.

  According to the hydraulic power generation apparatus 10 of this embodiment, the power generation apparatus main body 11 is fixed to the frame body 20 and is suspended from the beam member 16 and installed in the water channel 12. There is no need to install a structure, and it is possible to install the hydroelectric power generator 10 without an operator entering the water channel. In addition, if the power generator main body 11, the frame body 20 and the beam member 16 are assembled in advance, they can be suspended by a crane and installed on the head 14 of the predetermined water channel 12. Good sex. Furthermore, in the case of a waterway where a crane vehicle cannot enter, it is easy to assemble the power generator main body 11, the frame body 20 and the beam member 16 at the site, and it is also possible to assemble the waterway sequentially from the beam member 16. . Therefore, the power generator main body 11 can be installed regardless of the size of the head work 14.

  Furthermore, the power generator main body 11 of the present invention can reliably position the lower end of the water conduit 42 within the water surface on the downstream side of the drop head 14 by the expansion and contraction of the water conduit 42. There is no loss of pressure head without leaving the water surface. In addition, the water conduit 42 also follows the water level above and below, and when the water flow increases, the water conduit 42 is shortened, the lateral force applied to the water conduit 42 by the water flow is suppressed, and the power generator main body 11 is damaged. And the safety of the hydroelectric generator 10 can be ensured.

  In addition, a bypass port 28 is provided in the water intake 26, so that the flow of water can be suppressed from entering the water intake drum 22 when the flow rate is large or when the power generator main body 11 is inspected. Is good.

  Next, a hydroelectric generator 70 according to a second embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted. Similar to the above embodiment, the hydroelectric power generator 70 is installed across the concrete both banks of the waterway by the steel beam member 16 and the metal frame body 20 assembled in a rectangular shape. A cylindrical power generator main body 11 is fixed in the frame 20.

  The power generation device main body 11 has a cylindrical intake drum 22, and the downstream opening of the intake port 26 is connected to the opening on the upper side surface of the intake drum 22. The opening portion of the water intake port 26 is formed in a quadrangular shape, and an overflow bypass port 28 that can be opened toward the bottom surface on the downstream side of the drop work is provided on the lower surface of the water intake port 26 so as to be freely opened and closed. The bypass port 28 is provided with a lid member 28a, and the lid member 28a is provided so as to be openable and closable downward through an opening / closing connecting member (not shown).

  A water throttle portion 32 is coaxially fixed to the lower end opening of the intake drum 22. The water squeezing part 32 is provided with a cylindrical circular truncated conical water squeezing outer cylinder 34 whose large diameter part is fixed to the lower end part of the intake cylinder 22. A screw pipe 36 is attached to a small diameter portion which is a lower end of the water throttle outer cylinder 34, and a rotary screw 38 is rotatably and coaxially provided in the screw pipe 36. A water squeezing drum 33 is provided on the central axis inside the water squeezing outer cylinder 34 of the water squeezing part 32.

  A plurality of fixed guide vanes 40 are provided between the water throttle outer cylinder 34 of the water throttle unit 32 and the water throttle drum 33. The fixed guide vane 40 divides the space in the water throttle outer cylinder 34 in the water throttle part 32 at substantially equal intervals in the radial direction. The inner side edge portion of each fixed guide vane 40 is fixed to the side surface of the tubular portion of the water squeezing drum 33, and the opposite side edge portion is fixed to the inner peripheral surface of the water squeezing outer tube 34.

  The mounting angle of each fixed guide vane 40 is inclined in the range of about 20 degrees to 35 degrees with respect to the central axis direction of the water throttle portion 32. Preferably, it is attached within a range of about 25 degrees to 30 degrees. This inclination direction is inclined so as to proceed clockwise in the downward direction. Further, the inclination angle is provided so as to intersect at a substantially right angle with respect to the upper surface of a rotary screw 38 to be described later.

  A cylindrical water conduit 42 is provided below the screw pipe 36 to which the rotary screw 38 is attached. The water conduit 72 is formed as a telescopic bellows-like tube, and an upper end edge 72 a is fixed to the lower end edge of the screw pipe 36. An annular float 44 is fixed to the lower end 72 b of the water conduit 72. The float 44 is formed of foamed resin or the like, and a pair of guide bars 46 provided in the vertical direction protrude through the holding member 45 in the vertical direction. The guide bar 46 is inserted through a fixed guide 48 attached to the lower end 20b of the frame body 20, and is provided to be slidable in the vertical direction. The buoyancy of the float 44 has sufficient buoyancy to float the lower part of the water conduit 72 and is provided so as to be able to float at all times on the water surface of the water channel.

  A bearing portion is provided at the center of the rotary screw 38, and a shaft 50 is fixed to the rotary cylinder 38 on the center side of the rotary screw 38 integrally with the rotary screw 38 and the rotary cylinder 39. The shaft 50 is fixed through the rotary cylinder portion 39 of the rotary screw 38, extends vertically above the rotary cylinder portion 39, and rotates in a through hole formed coaxially with the water throttle drum 33 of the water throttle portion 32. It is inserted so as to be able to extend further upward and reaches the upper end 20 a of the frame 20.

  The upper end portion of the shaft 50 passes through a bearing 51 fixed to the upper end portion 20 a of the frame body 20 and is connected to the joint member 54. The joint member 54 is connected to the rotation shaft of the speed increaser 56, and the rotation shaft of the speed increaser 56 is connected to the rotation shaft of the generator 60 through another joint member. The step-up gear 58 is fixed on a housing 62 installed on the upper end 20 a of the frame body 20, and the generator 60 is installed on the housing 62. The upper end portion of the cylindrical body 64 that houses the shaft 50 is connected to the bottom surface of the mounting plate 63 to which the housing 62 is fixed, and the lower end portion of the cylindrical body 64 is connected to the upper end portion of the water squeezing drum 33 in a watertight manner. .

  In the same way as in the above embodiment, the hydroelectric generator 70 of this embodiment is assembled in advance in a factory or the like, and is suspended by a crane truck or the like at the installation site to Install between banks. Further, each member may be individually carried to the installation place and assembled on site.

  In the operation of the hydroelectric generator 10 of this embodiment, the water flowing through the water channel 12 flows into the water intake barrel 22 from the water intake 26 and the flow path is throttled by the water throttle portion 32, as in the first embodiment. Flow rate increases. The direction of the flow of the water flow with the increased flow velocity is regulated by the fixed guide vane 40 and flows down toward the extension line of the fixed guide vane 40. The water whose flow velocity is increased by the water throttling portion 32 from the water intake barrel 22 collides with the blade of the rotary screw 38, and the blade is pushed, and the rotary screw 38 rotates around the rotary cylinder portion 39. Each blade of the rolling screw 38 receives the water flow from the water constricting portion 32 at a slightly larger angle than the perpendicular direction on the surface, and effectively converts it into rotational energy.

  The water flow that has passed through the rotary screw 38 passes through the water conduit 42 and joins the water channel 12 on the downstream side of the drop head 14. Further, when the amount of water in the water channel 12 increases, the float 44 of the water conduit 42 floats on the water surface, so the position of the water surface on the downstream side of the drop work 14 always changes, and this hydroelectric generator 10 can be used. The amount of potential energy of the water flow is potential energy due to the difference between the position of the water surface where the float 44 floats and the position of the upstream water surface or the upper surface of the water intake 26. Furthermore, the velocity energy due to the water flow rate in the water channel 12 can also be used.

  Further, when the amount of water in the water channel 12 increases, the bellows-shaped water conduit 72 always changes to a required length. Also in this case, since the float 44 floats on the water surface, the position of the water surface on the downstream side of the drop work 14 always changes, and the amount of potential energy of the water stream that can be used by the hydroelectric generator 10 is the float 44. Is the potential energy due to the difference between the position of the floating water surface and the position of the upstream water surface or the upper surface of the water intake 26.

  The hydroelectric generator 70 of this embodiment also provides the same effects as the hydroelectric generator of the above embodiment, and the water trough 72 can be expanded and contracted to an arbitrary length, so that it can follow changes in water depth with good responsiveness. , Enabling efficient power generation.

  The power generator of the present invention is not limited to the above embodiment, and the shape of the frame can be set as appropriate, and the shape of the suspended beam member can also be selected as appropriate. The shape of the float, the number of guide bars, the mounting position, etc. can be set as appropriate.

DESCRIPTION OF SYMBOLS 10,70 Hydroelectric power generation device 11 Power generation device main body 12 Water channel 14 Drop work 16 Beam member 20 Frame body 22 Water intake drum 26 Water intake port 27 Water level gauge 28 Bypass port 28a Cover member 30 Motor 32 Water constriction part 36 Screw pipe 38 Rotating screw 40 Fixed Guide vanes 42, 72 Water guide 44 Float 46 Guide bar 48 Fixed guide 50 Shaft 60 Generator

Claims (5)

A water intake cylinder in which the central axis is provided vertically and water passes from the upper side to the lower side, a water throttle part provided coaxially below the water intake cylinder, and a rotation provided below the water throttle part A power generator main body provided with a screw and a generator connected to a shaft fixed to the rotating screw;
A frame body holding the power generation device main body, and a beam member to which the frame body is fixed,
In a state where the frame body to which the power generation device main body is fixed is fixed to the beam member, the power generation device main body is suspended and fixed to a water drop by the beam member,
The frame is formed in a rectangular shape, accommodates the power generation device main body, the upper ends of the frame are fixed to a pair of beam members, and the pair of beam members are pedestals installed on both sides of the water channel Fixed to
On the downstream side of the rotary screw, there is a water conduit that allows the water that has passed through the rotary screw to flow, the water conduit is provided coaxially and telescopically with the rotary screw, and a float is provided on the lower end side of the water conduit. The hydroelectric power generator is fixed, and is provided such that the lower end side of the water conduit is movable up and down by the amount of water in the water channel .   The hydroelectric generator according to claim 1, wherein the water conduit is a concentric sliding fit of a plurality of cylinders having different diameters.   The hydroelectric generator according to claim 1, wherein the water conduit is a bellows-like elastic tube.   The intake cylinder is provided with an intake opening, an opening of the intake opening is opened toward a water channel upstream of the drop work, and a bypass opening is formed in the intake opening to allow the water flow to escape to the outside of the intake cylinder. The hydroelectric power generator according to claim 1. The hydroelectric generator according to claim 4, wherein a lid member is provided at the bypass port, and the lid member is provided so as to be freely opened and closed by a motor operated by a water level gauge.

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