JP2015055222A - Hydraulic power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic power generator for converting rotation energy of water forming a vortex to electric energy, and capable of suppressing degradation in power generation capacity in a dry season.SOLUTION: A hydraulic power generator 1 according to the present invention includes: a storage tank 10 having a substantially circular bottom wall 10b and a cylindrical sidewall 10a extending upward from an edge of the bottom wall 10b; and a turbine 20 installed in the storage tank 10 and connected to a generator 30. Water introduced into the storage tank 10 from a water intake 11 on the sidewall 10a flows toward an exhaust port 12 on the bottom wall 10b while forming a vortex. Contact of blades 20c of the turbine 20 with the vortex enables the turbine 20 to rotate to generate electric power. If a diameter of the exhaust port 12 is set to one-third to one-twelfth of an inside diameter of the sidewall 10a, an upper end position of the vortex in the storage tank 10 does not greatly lower even in a dry season, so that it is possible to suppress degradation in power generation capacity.

Description

  The present invention relates to a hydroelectric power generation apparatus that converts rotational energy of water forming vortices into electric energy.

  Patent Literature 1 (WO2004 / 061295A2) discloses a hydroelectric power generation device that generates power using the rotational energy of water forming vortices. FIG. 9 shows a schematic cross-sectional view of the hydroelectric generator described in this document. The hydroelectric generator 100 includes a water storage tank 110 for storing water and a turbine 120 connected to a generator 130 as essential elements. A water intake path 140 for supplying water to be introduced into the water storage tank 110 is connected to the side wall 110a of the water storage tank 110, and the water storage tank 110 is located at a substantially central position on the bottom wall 110b of the water storage tank 110. A circular discharge port 112 for discharging water in 110 is provided. The bottom wall 110b of the water storage tank 110 is installed at a distance Y above the water surface of the water discharge channel 150 for allowing the water that has passed through the discharge port 112 to flow out. A shaft 130 a of the generator 130 connected to the turbine 120 is disposed on the central axis X of the circular drainage port 112.

  The water flowing into the water storage tank 110 from the intake channel 140 flows into the drain port 112 while forming the vortex A, passes through the drain port 112, falls freely by a distance Y, and is discharged to the discharge channel 150. At this time, in the central region of the vortex A, an air column B whose diameter increases as it goes upward is formed. The center of the vortex A or the center of the air column B also exists on the central axis X of the circular drainage port 112. The peripheral speed of the vortex A increases as it approaches the center of the vortex A and the drop from the water surface (the upper end of the vortex) in the water storage tank increases. When the turbine 120 having power generation blades is installed in a place where the peripheral speed of the vortex A is large, the turbine 120 rotates by taking rotational energy from the vortex A, and further, the generated rotational energy is connected to the turbine 120. It is converted into electrical energy by the machine 130. That is, in this hydroelectric power generation device 100, the potential energy of water introduced into the water storage tank 110 is converted into kinetic energy (rotational energy) and further into electrical energy.

Patent Document 1 discloses the following four conditions as conditions required for the water storage tank.
1. The reservoir tank must be larger than the desired vortex size.
2. The bottom wall should be as flat and horizontal as possible for stable formation of vortices.
3. A circular drain should be provided as much as possible in the approximate center of the bottom wall.
4). The water discharged from the drain must be able to fall freely.
This document also shows that the amount of water discharged is determined by the diameter of the drain and that the diameter of the drain can be changed.

  Patent Document 2 (WO2008 / 141349A2) describes a method for improving the power generation efficiency of the hydroelectric generator disclosed in Patent Document 1. A schematic plan view of the hydroelectric generator described in this document is shown in FIG. The same symbols are attached to the same components as the components of the hydroelectric generator shown in FIG. In this hydroelectric power generation device 100, a bottomed cylindrical water storage tank 110 is used, and a turbine 120 connected to the generator 130 is supported by support members 160 and 161 spanned on the upper edge of the water storage tank side wall 110a. It is suspended by a mounting plate 162 attached thereto. One side wall 140a of the intake channel 140 extends in a direction coinciding with the tangential direction of the water storage tank side wall 110a. A wedge-shaped element 171 for changing the direction of the water flowing through the intake passage 140 is provided at a joint portion between the other side wall 140b of the intake passage 140 and the water storage tank sidewall 110a. A surface 171a of the wedge-shaped element 171 facing the turbine 120 is provided continuously from the inner surface of the water storage tank side wall 110a and is formed in a concave shape. The intake channel 140 is also provided with a rough fence 170 for removing large waste from entering the water storage tank 110.

  Of the water flowing through the intake channel 140, the water flowing close to the one side wall 140a flows into the water storage tank 110 from the tangential direction of the water storage tank side wall 110a, flows in the circumferential direction along the inner surface of the side wall 110a, and swirls. Form. The vortex is more easily formed as the flow rate of water toward the tangential direction of the side wall 110a increases. However, when the wedge-shaped element 171 does not exist, the water flowing close to the other side wall 140b of the water intake path 140 enters the water storage tank 110 from a direction substantially perpendicular to the water flow along the inner surface of the water storage tank side wall 110a. Will flow into. As a result, the flow of water in the circumferential direction of the water storage tank 110 is obstructed, the symmetry of the vortex is broken, and the power generation efficiency of the hydroelectric generator 100 is reduced. On the other hand, when the wedge-shaped element 171 exists, the water flowing along the inner surface of the water storage tank side wall 110a further flows along the concave surface 171a of the wedge-shaped element 171, so that the water flow in the circumferential direction of the water storage tank 110 is further increased. Stabilize. In addition, the water flowing close to the side wall 140b of the intake channel 140 is guided by the wedge-shaped element 171 so as to flow into the water storage tank 110 from a direction substantially coincident with the water flow along the inner surface of the water storage tank side wall 110a. Therefore, the flow of water in the circumferential direction of the water storage tank 110 is not obstructed. Furthermore, since the cross-sectional area of the intake channel 140 is reduced by the wedge-shaped element 171, the flow rate of water flowing into the water storage tank 110 is increased, and vortices are more easily formed in the water storage tank 110. As a result, the symmetry of the vortex is kept stable, and the power generation efficiency of the hydroelectric generator 100 is increased.

WO2004 / 061295A2 WO2008 / 141349A2

The hydroelectric generators disclosed in Patent Document 1 and Patent Document 2 are suitable for small-scale power generation using water resources that flow relatively slowly. However, there is no problem if the amount of water is sufficiently secured due to the reason such as hitting the water supply season, but if the amount of water decreases due to the reason such as hitting the drought season, the power generation capacity decreases due to the following three causes. There was a problem that. The “water surface in the water storage tank” means the upper end of the vortex of the water in the tank.
1. Since the position of the water surface in the water storage tank is lowered and the head of water in the tank is reduced, the rotational energy of the vortex is reduced.
2. Since the position of the water surface in the water storage tank is lowered and the proportion of the portion of the blades of the turbine that has entered the vortex is reduced, the rotational efficiency of the turbine is lowered.
3. Since the flow velocity of water toward the tangential direction of the side wall of the water storage tank decreases, vortices are less likely to occur.

  In Japan's climate, the limit of power generation services is determined by how much power generation can be secured in the winter drought period, or stable power supply is expected regardless of the amount of water. Solutions to general problems are desired.

  Therefore, an object of the present invention is to suppress a decrease in the power generation capacity of a hydroelectric power generation apparatus that converts the rotational energy of water forming vortices into electrical energy even when the amount of water is reduced due to a drought period, etc. It is to provide a hydroelectric generator that can be used.

  As a result of intensive studies, the inventor maintained the position of the water surface in the water tank as high as possible even when the amount of water decreased, and further improved the vortex generation capacity of water introduced into the water tank, The inventors have found that the above problems can be solved, and have completed the invention.

  Therefore, the hydroelectric generator of the present invention has a substantially circular bottom wall in a plan view, and a cylindrical side wall extending upward from the edge of the bottom wall. Is provided with a water intake port for introducing water in a tangential direction of the side wall, and a water storage tank provided with a circular drain port for discharging water downward at a substantially central position of the bottom wall. And a turbine shaft that is rotatably provided on the central axis of the drain outlet and has an upper end connected to the generator, and is connected to the turbine shaft and provided at equal intervals in the circumferential direction of the turbine shaft. A turbine having a plurality of blade portions, wherein water introduced from the water intake port flows into the water storage tank toward the drain port while forming a vortex, and the blades of the turbine The part is in contact with the vortex More preferably, the turbine is rotated to generate electricity, and the drainage port has a diameter of 1/3 to 1/12, preferably 1/5 to 1/12 of the inner diameter of the side wall. Particularly preferred in the case of a range, a significant drought period, is characterized by a range of 1/6 to 1/12. When the inner diameter of the side wall of the water storage tank varies depending on the height of the side wall, the “inner diameter of the side wall” means an average value.

  In the hydroelectric generator of the present invention, unlike the knowledge from Patent Document 1, if the bottom wall of the water storage tank is substantially circular in plan view, it is not necessary to be flat and horizontal, and the water discharged from the drain outlet is Although it is preferable to be able to fall freely, free fall is not essential, and a vortex of water is formed in the water storage tank, and a vortex flow having an air column that increases in diameter toward the center region of the vortex is formed. Is enough. Moreover, the blade | wing part of a turbine may be directly fixed to the turbine shaft, and may be connected to the turbine shaft via the connection member fixed to the turbine shaft. The blade portion of the turbine is preferably disposed at a location where the peripheral speed of the vortex is high, that is, a location where the vortex flow is accelerated by gravity, and is preferably disposed near the bottom wall of the water storage tank.

  By setting the diameter of the drain outlet provided on the bottom wall of the water storage tank to the range of 1/3 to 1/12 of the inner diameter of the side wall of the water storage tank, the position of the water surface in the water storage tank can be properly maintained. it can. The amount of water discharged from the water storage tank depends on the area of the drain, but if the diameter of the drain is larger than 1/3 of the inner diameter of the side wall of the water storage tank, the amount of water discharged from the drain will increase. During the drought period, the water level in the water storage tank falls, and the power generation capacity of the device is seriously reduced. In addition, if the diameter of the drain outlet is smaller than 1/12 of the inner diameter of the side wall of the water storage tank, the amount of water discharged from the drain outlet becomes excessively small. Therefore, in order to keep the vortex in the water storage tank in equilibrium, water intake is required. The amount of water introduced from the mouth must be reduced, resulting in a reduction in the power generation capacity of the device. As described above, Patent Document 1 shows that the amount of water discharged is determined by the diameter of the drain port and that the diameter of the drain port can be changed. It does not show whether the diameter is appropriate, nor does it describe how to change the diameter of the drain.

  In the hydroelectric generator of the present invention, it is preferable that a water level raising means is provided for raising the water level in the water storage tank when the amount of water introduced from the water intake into the water storage tank decreases. This water level rising means has the effect of suppressing the decrease in power generation capacity of the device during the drought period even when the diameter of the drain outlet is not limited to the above range, but if the diameter of the drain outlet is limited to the above range, it cooperates. The action suitably suppresses the reduction in the power generation capacity of the device. The water level raising means may be incorporated in the apparatus in advance before the start of operation of the hydroelectric power generation apparatus, and may be added to the apparatus only when the amount of water introduced from the intake port is reduced. It is convenient and preferred to add to the device only when the amount is reduced. As a preferable example of such a preferable water level raising means, a plug having a through hole for allowing water to be inserted into the drain port when the amount of water is reduced or on the inner surface of the side wall on the bottom wall. Mention may be made of a donut ring-shaped floor covering member having a substantially right-angled triangular cross section.

  In the hydroelectric generator of the present invention, when the bottom wall of the water storage tank exists below the lower end of the water intake port, when the amount of water introduced from the water intake port is significantly reduced, the water is stored in the water storage tank. It becomes difficult to flow toward the tangential direction of the side wall and falls downward from the water intake. Since the water dropped downward from the water intake has little ability to generate vortices, the power generation capacity of the apparatus is significantly reduced. However, if water introduction means for guiding water falling downward from the water intake port in the tangential direction of the side wall when the amount of water introduced from the water intake port is reduced in the water storage tank is provided, Even when the amount of water introduced from the mouth is greatly reduced, water vortices can be properly formed in the water storage tank. This water guiding means has an effect of suppressing a decrease in the power generation capacity of the device in the drought period even when the diameter of the drain outlet is not limited to the above range, but if the diameter of the drain outlet is limited to the above range, the cooperative action Thus, a decrease in the power generation capability of the apparatus is suitably suppressed. The water guiding means may be incorporated in the apparatus in advance before the operation of the hydroelectric power generation apparatus is started, or may be added to the apparatus only when the amount of water introduced from the water intake port is reduced. As a preferable example of the water guiding means, there can be mentioned a guide member that guides water introduced from the water intake port in a substantially horizontal direction along the inner surface of the side wall and downward as it moves away from the water intake port.

Although the size of the water storage tank in the hydroelectric generator of the present invention is not particularly limited, the amount of power generation when the water is full is proportional to the volume of water in the water storage tank. When the inner diameter of the side wall is in the range of 5 to 10 m and the drop between the upper end of the vortex and the drainage port is in the range of 0.7 to ³ m, a large intake port of about 0.05 to 20 m ³ / sec. Even when there is a change in the amount of water from about 5 to 40 kW, power generation of about 5 to 40 kW can be achieved.

  In the hydroelectric power generation device of the present invention, the position of the water surface in the water storage tank can be kept appropriate throughout the year, and even when the amount of water is reduced due to a drought season, etc., it is possible to suppress a decrease in the power generation capacity of the device. .

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the hydroelectric generator of one Embodiment of this invention, (A) has shown the top view, (B) has shown sectional drawing along the II line | wire of (A). It is the schematic which shows the water storage tank, the intake channel, and the water discharge channel in the hydroelectric generator shown in FIG. 1, (A) has shown the top view, (B) was along the II line | wire of (A). A cross-sectional view is shown. It is the schematic which shows the state which poured the water into the water storage tank shown in FIG. 2, the intake channel, and the water discharge channel, (A) has shown the top view, (B) is II line | wire of (A). FIG. It is a schematic sectional drawing of the hydroelectric generator of another embodiment of the present invention. It is the schematic of the hydroelectric generator of another embodiment of this invention, (A) has shown the top view, (B) has shown sectional drawing along the II line of (A). . It is the schematic of the hydroelectric generator of another embodiment of this invention, (A) is a top view of a water storage tank, a water intake channel, and a water discharge channel, (B) is along the II line of (A). (C) is a cross-sectional view of the hydroelectric generator. It is a schematic top view which shows the modification of an intake channel. It is a schematic plan view which shows another modification of an intake channel. It is a schematic sectional drawing of the conventional hydroelectric generator. It is a schematic plan view of another conventional hydroelectric generator.

1st Embodiment The hydroelectric generator of 1st Embodiment of this invention is demonstrated using FIGS.

  FIG. 1 is a schematic diagram of a hydroelectric generator 1 according to the present embodiment. For ease of understanding, FIG. 2 shows a water storage tank 10 for storing water in the hydroelectric generator 1 in a state where no water flows, a water intake path 40 for introducing water into the water storage tank 10, and a water storage tank. The water discharge channel 50 for flowing out the water discharged | emitted from 10 is shown schematically, and in FIG. 3, the water storage tank 10, the intake channel 40, and the water discharge channel 50 of the state which flowed the water are shown schematically. In any of the drawings, (A) shows a plan view, and (B) shows a cross-sectional view taken along line II in (A).

  The hydroelectric generator 1 includes a water storage tank 10 for storing water and a turbine 20 connected to a generator 30 as essential elements. As shown in FIG. 2, the water storage tank 10 has a substantially circular flat and horizontal bottom wall 10b, and a cylindrical side wall 10a extending substantially vertically upward from the edge of the bottom wall 10b. ing. The inner diameter of the side wall 10a is set in a range of 5 to 10 m, and the height of the side wall 10a is set in a range of 0.7 to 3 m. The side wall 10a is provided with a water intake port 11 for introducing water in the tangential direction of the side wall 10a, and a circular drain port 12 for discharging water downward is provided at a substantially central position of the bottom wall 10b. It has been. The diameter of the discharge port 12 is set in a range of 1/3 to 1/12 of the inner diameter of the side wall 10a.

  The intake channel 40 connected to the intake port 11 is arranged so that water can be introduced in the tangential direction of the side wall 10a, and the water discharge channel 50 can receive water discharged from the drain port 12. It is arranged below the bottom wall 10b. In addition, the intake channel 40 is provided with a coarse-grained fence 70 for eliminating large-scale waste from entering the water storage tank 10.

  When water is caused to flow from the intake channel 40, water is introduced into the water storage tank 10 from the intake port 11 in the tangential direction of the side wall 10a, as shown in FIG. The introduced water flows in the circumferential direction along the inner surface of the side wall 10 a of the water storage tank 10, flows down toward the drain port 12 while forming the vortex A, and is discharged from the drain port 12 to the water discharge channel 50. In the central region of the vortex A, an air column B whose diameter is increased toward the upper side is formed. The center of the vortex A or the center of the air column B exists on the central axis C of the circular drainage port 12. The greater the amount of water introduced from the intake channel 40, the smaller the diameter of the air column B.

  As shown in FIG. 1, a turbine 20 connected to a generator 30 is disposed in the water storage tank 10. The turbine shaft 20 a that hits the rotating shaft of the turbine 20 is rotatably supported by a support member 60 that spans the upper edge of the side wall 10 a of the water storage tank 10, and the upper end is connected to the generator 30. The turbine shaft 20 a is located on the central axis C of the drain port 12. A disk-shaped connecting member 20b disposed substantially parallel to the bottom wall 10b of the water storage tank 10 is fixed to the turbine shaft 20a, and four rectangular blade portions 20c are connected to the turbine shaft 20a. It is fixed at equal intervals in the circumferential direction 20a. Each blade portion 20 c is disposed so as to be inserted at a location where the peripheral speed of the vortex A is high, that is, at a position close to the air column B of the vortex A, and extends to the vicinity of the bottom wall 10 b of the water storage tank 10. The inner surface of the side wall 10a of the water storage tank 10 and the blade portion 20c of the turbine 20 are sufficiently separated, and the water introduced from the intake port 11 directly collides with the blade portion 20c of the turbine 20 before the formation of the vortex A. There is nothing.

  The water introduced into the water storage tank 10 from the intake channel 40 and forming the vortex A comes into contact with the blade portion 20 c of the turbine 20 from the tangential direction of the circumference of the turbine 20. At this time, the turbine 20 rotates by taking rotational energy from the vortex A, and the rotational energy thus taken is converted into electric energy by the generator 30 connected to the turbine shaft 20a. The water that has come into contact with the blade portion 20 c of the turbine 20 descends along the blade portion 20 c and is discharged from the drain port 12 to the water discharge channel 50. Since small garbage such as dead leaves is discharged into the water discharge channel 50 together with water, there is no problem even if it enters the water storage tank 10. In the present embodiment, since the diameter of the discharge port 12 is set in a range of 1/3 to 1/12 of the inner diameter of the side wall 10a of the water storage tank 10, the amount of water introduced from the intake channel 40 during the drought period is reduced. Even so, the position of the water surface (the upper end of the vortex A) in the water storage tank 10 is prevented from being significantly lowered.

Second Embodiment A hydroelectric generator according to a second embodiment of the present invention will be described with reference to the cross-sectional view of FIG. Constituent members that are the same as the constituent members in the hydroelectric generator of the first embodiment are given the same reference numerals, description thereof is omitted, and only different points will be described.

  The hydroelectric generator 1 of this embodiment has a plug (water level raising means) 80 that is inserted into the drain port 12 only when the amount of water is reduced. The plug 80 is shown enlarged in the circle in FIG.

  The plug 80 has a through hole 80b for allowing water to pass through, and a taper is formed on the side surface 80a. In addition, a chain 81 for collecting the plug 80 when the amount of water increases is connected to the plug 80. When the plug 80 is dropped into the water storage tank 10 from the upper end of the water storage tank side wall 10 a when the amount of water is reduced, the water plug 80 is accommodated in the water discharge opening 12 by the suction force of the water flowing through the water discharge port 12. Although the amount of water discharged from the water storage tank 10 depends on the area of the drain port 12, a water storage tank having a drain port with a small diameter by a plug 80 having a hole 80b having an area smaller than the area of the drain port 12 was used. The same effect as the case can be obtained. If the amount of water discharged from the water storage tank 10 decreases, the water level in the water storage tank 10 can be raised, and therefore the head between the water surface and the drain 12 can be increased, and the blades of the turbine 20 can be increased. It is possible to increase the proportion of the portion 20c that has entered the vortex. For this reason, the hydroelectric generator 1 of the present embodiment can effectively suppress a decrease in power generation efficiency of the apparatus 1 during the drought period.

Third Embodiment A hydroelectric generator according to a third embodiment of the present invention will be described with reference to the schematic diagram of FIG. Constituent members that are the same as the constituent members in the hydroelectric generator of the first embodiment are given the same reference numerals, description thereof is omitted, and only different points will be described. 5A shows a plan view, and FIG. 5B shows a cross-sectional view taken along line II of FIG. 5A.

  The hydroelectric generator 1 of the present embodiment has a bottom member (water surface raising means) 85 disposed along the inner surface of the side wall 10a on the bottom wall 10b of the water storage tank 10 only when the amount of water is reduced.

  The sole member 85 is formed of a material having a specific gravity greater than 1 and flexibility. In the unlikely event that the blade 20c of the turbine 20 is touched, it is preferably formed of a material such as rubber that does not damage the blade 20c. The bottom member 85 has a shape obtained by cutting an annular ring from the outer edge toward the inner edge, and the shape of the cut surface is a substantially right triangle having sides extending substantially perpendicularly from the outer edge. The outer diameter of the annular ring is set slightly shorter than the inner diameter of the side wall 10 a of the water storage tank 10. Also, the bottom member 85 is attached with a hook 86 for hooking a locking tool when the bottom member 85 is collected when the amount of water increases.

  When the bottom member 85 is dropped from the upper end of the side wall 10a of the water storage tank 10 to a position where it does not collide with the turbine 20 in the water storage tank 10 when the amount of water is reduced, the bottom member 85 that has reached the bottom wall 10b is caused by the centrifugal force of the vortex. It is pressed against the side wall 10a and is spread out in a donut ring shape without contacting the blade 20c of the turbine 20. Since the water is removed by the volume of the bottom member 85 according to the Archimedes principle, the water surface can be raised. Therefore, the drop between the water surface and the drain port 12 can be increased, and the proportion of the portion of the blade 20c of the turbine 20 that has entered the vortex can be increased. For this reason, the hydroelectric generator 1 of the present embodiment can effectively suppress a decrease in power generation efficiency of the apparatus 1 during the drought period.

Fourth Embodiment A hydroelectric generator according to a fourth embodiment of the present invention will be described with reference to the schematic diagram of FIG. Constituent members that are the same as the constituent members in the hydroelectric generator of the first embodiment are given the same reference numerals, description thereof is omitted, and only different points will be described. (A) of FIG. 6 is a plan view of the water storage tank 10, the intake channel 40, and the water discharge channel 50 in a state in which water does not flow, and (B) is a cross-sectional view taken along line II of (A). (C) is sectional drawing of the hydroelectric generator 1 of the state which poured water.

  In the hydroelectric generator 1 of the present embodiment, the bottom wall 10b of the water storage tank 10 exists below the lower end of the water intake port 11 as shown in (A) and (B). And the guide member (water guide means) 90 extended in the substantially horizontal direction along the inner surface of the side wall 10a from under the water intake 11 is provided in the inner surface side of the side wall 10a of the water storage tank 10. FIG. The guide member 90 is inclined downward as it is away from the water intake 11.

  In the case where the guide member 90 is not present, when the amount of water introduced into the water storage tank 10 from the intake channel 40 is significantly reduced, it becomes difficult for water to flow toward the tangential direction of the side wall 10 a of the water storage tank 10. Then, it comes to fall downward from the water intake 11. Since the water dropped downward from the water intake 11 has almost no vortex generation capability, the power generation capability of the device 1 is significantly reduced, and power generation stops in some cases. However, when the guide member 90 is present, as indicated by arrows in (A) and (B), water that has dropped downward from the water intake port 11 is guided to the guide member 90 and along the inner surface of the side wall 10a and water intake. As it leaves the mouth 11, it will be guided downward. That is, the water introduced from the water intake port 11 again flows in the tangential direction of the side wall 10a, and the vortex generation ability is restored. As a result, as shown in (C), even when the amount of water introduced from the intake channel 40 is significantly reduced, a vortex of water is formed in the water storage tank 10, and the device 1 in the drought period It is possible to effectively suppress a decrease in power generation efficiency or stop of power generation.

  As mentioned above, although four embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The change in the range which does not deviate from the meaning of this invention is possible.

  For example, in the said embodiment, the width | variety (distance between intake channel side walls) of the intake channel 40 is made comparatively narrow so that water can be introduce | transduced into the storage tank 10 from the tangential direction of the side wall 10a of the storage tank 10. FIG. However, when the hydroelectric generator 1 of the present invention is installed in a wide river, a part of the river 35 can be diverted to form the intake channel 40 as shown in FIGS. In these drawings, the same components as those in the first embodiment are denoted by the same symbols. Symbol 36 represents a sluice. Since the amount of water circulated through the intake channel 40 can be adjusted by opening and closing the sluice 36, increasing the amount of water in the intake channel 40 by the sluice 36 during the drought period effectively reduces the power generation efficiency in the drought period. Can be suppressed. What is necessary is just to join the waste_water | drain from a drain outlet to the river 35. FIG. Further, as shown in FIG. 8, when a part of the river 35 is diverted to form the intake channel 40, the one side wall 40 b of the intake channel 40 is moved closer to the water storage tank 10, and the other side wall 40 a. It is preferable to incline so that it may approach. Of the water flowing through the intake channel 40, the water flowing close to the side wall 40b flows into the water storage tank 10 from a direction substantially coincident with the flow of water along the inner surface of the water storage tank side wall 10a. The flow of water in the circumferential direction of the tank 10 is not obstructed, and furthermore, the cross-sectional area of the intake channel 40 is reduced, so that the flow rate of water flowing into the water storage tank 10 is increased, and vortices are further formed in the water storage tank 10. It becomes easy. As a result, the symmetry of the vortex is kept stable, and the power generation efficiency of the hydroelectric generator 1 is increased. The same effect can be obtained by the wedge-shaped element disclosed in Patent Document 2.

  Moreover, the shape of the turbine 20 is not limited to the shape shown in each embodiment, For example, the turbine 20 by which the blade | wing part 20c is being fixed to the turbine shaft 20a can also be used. Furthermore, by incorporating a throttle mechanism for changing the diameter of the drain port 12 of the water storage tank 10 by an electrical signal in the apparatus 1 in advance, the stopper 80 can be replaced, and the guide member 90 is not provided in the water tank 10 in advance. A structure in which a guide member 90 is attached to the tip of a suspension member that can be locked to the upper edge of the water storage tank 10 is prepared, and this structure is installed in the water storage tank 10 only when the amount of water decreases. Also good.

  According to the present invention, there is provided a hydroelectric power generation device in which a decrease in power generation capacity is suppressed even when the amount of water is reduced due to a drought season or the like.

DESCRIPTION OF SYMBOLS 1 Hydroelectric power generation device 10 Water storage tank 10a Side wall 10b Bottom wall 11 Water intake 12 Drainage port 20 Turbine 20a Turbine shaft 20c Blade part 30 Generator 80 Plug (water surface raising means)
85 Bottom material (water level rising means)
90 Guide member (water guide means)
A Vortex C Drain outlet central axis

Claims (7)

It has a substantially circular bottom wall in plan view and a cylindrical side wall extending upward from the edge of the bottom wall, and water is introduced into the side wall in a tangential direction of the side wall. A water intake tank provided with a circular drainage port for discharging water downward at a substantially central position of the bottom wall;
A turbine shaft that is rotatably provided on the central axis of the drain outlet and has an upper end connected to the generator, and is connected to the turbine shaft and provided at equal intervals in the circumferential direction of the turbine shaft. A plurality of vanes, and a turbine having
With
Water introduced from the intake port into the water storage tank flows toward the drain port while forming a vortex, and the blades of the turbine come into contact with the vortex, thereby rotating the turbine and generating power. A hydroelectric generator,
The hydroelectric power generator characterized in that the diameter of the drain outlet is in the range of 1/3 to 1/12 of the inner diameter of the side wall.   2. The hydroelectric generator according to claim 1, wherein a water level raising unit is provided in the water storage tank to raise the water level in the water storage tank when the amount of water introduced from the intake port decreases.   The hydroelectric generator according to claim 2, wherein the water surface raising means is a plug having a through-hole for allowing water to pass, which is inserted into the drain port.   3. The hydroelectric generator according to claim 2, wherein the water surface raising means is a donut-ring shaped bottom member having a substantially right-angled triangular cross section disposed on the bottom wall along the inner surface of the side wall. The bottom wall of the water storage tank exists below the lower end of the water intake;
The water storage means is provided in the water storage tank for guiding water falling downward from the water intake port in a tangential direction of the side wall when the amount of water introduced from the water intake port is reduced. The hydroelectric generator of any one of -4.   The hydroelectric generator according to claim 5, wherein the water guiding means is a guide member that guides water introduced from the water intake port in a substantially horizontal direction along the inner surface of the side wall and downward as the water port is separated from the water intake port. .   The hydroelectric power generation according to any one of claims 1 to 6, wherein an inner diameter of the side wall is in a range of 5 to 10 m, and a drop between an upper end of the vortex and the drain outlet is in a range of 0.7 to 3 m. apparatus.

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