WO2020162071A1

WO2020162071A1 - Lift device for water-flow power generator and water-flow power generation device

Info

Publication number: WO2020162071A1
Application number: PCT/JP2019/050815
Authority: WO
Inventors: 貴光冨山; 勇樹林; 関　和市
Original assignee: Thk株式会社
Priority date: 2019-02-07
Filing date: 2019-12-25
Publication date: 2020-08-13
Also published as: JP7319054B2; JP2020128708A

Abstract

Provided is a lift mechanism for a water-flow power generator and a water-flow power generation device that can be easily installed in any installation environment, do not have large mechanical structures, and, even when water level fluctuation occurs, can lift and lower the position of the water-flow power generator in response to the water level that has fluctuated so that a water wheel is constantly disposed below the water surface. The present invention comprises a water-flow power generator that includes a water wheel that obtains rotational driving force from a water flow, a rotating shaft that rotatably supports the water wheel, and a power generator that is connected to the rotating shaft and that generates electric power by receiving the rotational driving force; a frame from which the water-flow power generator hangs; and a lift mechanism that connects the water-flow power generator to the frame, liftably holds the water-flow power generator, and is positioned so as to be separated in a circumferential direction of the rotating shaft.

Description

Lifting device for water current generator and water current generator

The present invention relates to a lifting device for a water current generator and a water current power generator.

BACKGROUND ART Conventionally, there is known a water-flow generator that obtains a rotational driving force by receiving a water flow from a water turbine and transmits the rotational driving force to a generator to generate electric power. In such a hydroelectric generator, power generation is performed efficiently by the water turbine receiving the water flow properly.Therefore, the installation method of the hydroelectric generator is designed according to the installation environment so that the hydro turbine is always placed under the water surface. ing.

In addition, when power is generated using the water flow of an irrigation canal or river, the water level fluctuates due to environmental factors such as weather, so if the water level fluctuates so that the turbine can receive the water flow properly. It is known to provide a mechanism that can change the position of a hydroelectric generator. Although various structures are known as a mechanism capable of following such fluctuations in water level, for example, as shown in Patent Document 1, as a water level moves up and down, a water current generator is raised and lowered. The mechanism is installed on the support tower.

According to such a water flow generator, it is possible to raise and lower the water turbine according to the fluctuation of the water level so that the water wheel is always arranged below the water surface. Therefore, the rotational driving force efficiently received from the water flow can be obtained. Can be transmitted to the generator to generate electric power.

Japanese Patent Laid-Open No. 2007-212651

However, according to the conventional hydroelectric generator, the installation method of the hydroelectric generator is designed according to the installation environment, so if you try to install the hydroelectric generator at a place far from the ground surface (deep water surface) The mechanical structure had to be designed for each installation environment, such as lengthening the rotating shaft that transmits the rotation of the water turbine. However, when the rotating shaft is lengthened, a moment load is applied to the rotating shaft due to the water flow of the water turbine, and the rotating shaft is bent or damaged by the moment load. However, there is a problem in that as the size of the rotating shaft increases, the size of the supporting member such as the bearing that supports the rotating shaft also increases and the size of the entire apparatus increases.

Also, in order to reliably install the water flow generator according to the installation location, it was necessary to specially design the structures such as the support tower according to the installation location.

Also, as for the mechanism capable of following the fluctuation of the water level, as described in Patent Document 1, in order to move the water current generator up and down, it is necessary to design the rotating shaft to be long by the stroke amount of the water turbine. However, as described above, there is a problem that the entire device becomes large. Furthermore, it is conceivable that the generator main body is fixed and only the rotating shaft is moved up and down according to the water level change.In this case, when the rotating shaft is raised, the surface of the rotating shaft exposed until then is The contact with the bearings and other parts of the hydroelectric generator causes foreign matter and water droplets to enter the interior of the hydroelectric generator, resulting in deterioration of dustproofness and waterproofness.

The present invention has been made to solve the above problems, and can be easily installed in any installation environment, without increasing the size of the mechanical structure, Even if there is a change, it is possible to provide an elevating device for a water current generator and a water current power generator that can raise and lower the position of the water current generator so that the water turbine is always placed under the water surface according to the water level after the change. To aim.

A lifting device for a water current generator according to the present invention that solves the above-mentioned problems is a water turbine that receives a water flow to obtain a rotational driving force, a rotary shaft that rotatably supports the water turbine, and the rotary shaft that is connected to the rotary shaft. A lifting device for a water current generator of a water current generator having a generator that receives driving force to generate electric power, wherein a pedestal for suspending the water current generator, the water current generator is attached, and the rotating shaft An elevating mechanism having a guide shaft different from that is provided, and the elevating mechanism is attached to the gantry such that the attachment position can be changed.

According to the lifting device for a water current generator and the water current power generator according to the present invention, the pedestal and the lifting mechanism can be adapted to various environments without increasing the size of the entire device and without improving the water current generator itself. Since the position of the water current generator can be set arbitrarily by the combination of, stable power generation becomes possible.

1 is a perspective view of a water current power generation device according to a first embodiment of the present invention. The front view of the water current power generator which concerns on the 1st Embodiment of this invention. The partial cross section perspective view of the raising/lowering mechanism of the water current power generator which concerns on the 1st Embodiment of this invention. Sectional drawing of the housing of the raising/lowering mechanism of the water current power generator which concerns on the 1st Embodiment of this invention. It is a figure explaining operation|movement of the water current generator which concerns on the 1st Embodiment of this invention, (a) shows the case where a water current generator is located above, (b) shows a water current generator downward. The case where it is located is shown. It is a figure explaining operation|movement of the water current generator which concerns on the 1st Embodiment of this invention, (a) shows the case where a water current generator is moved upwards, (b) shows a water current generator in the center. The case where the water flow generator is moved is shown, and (c) shows the case where the water current generator is moved downward. The front view of the water current power generator which concerns on the 2nd Embodiment of this invention. The front view of the water current power generator which concerns on the 3rd Embodiment of this invention.

Hereinafter, an embodiment of a water current power generation device according to the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and all combinations of the features described in the embodiments are not necessarily essential to the solution means of the invention. ..

[First Embodiment]
FIG. 1 is a perspective view of a water current power generation device according to a first embodiment of the present invention, FIG. 2 is a front view of a water current power generation device according to a first embodiment of the present invention, and FIG. FIG. 4 is a partial cross-sectional perspective view of a lifting mechanism for a water current power generation device according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view of a housing of a lifting mechanism for a water current power generation device according to a first embodiment of the present invention. FIG. 5 is a diagram for explaining the operation of the water current generator according to the first embodiment of the present invention, where (a) shows the case where the water current generator is located above, and (b) is FIG. 7 is a diagram showing a case where the water current generator is located below, FIG. 6 is a diagram explaining the operation of the water current power generation device according to the first embodiment of the present invention, and (a) is a water current power generation device. The figure shows the case where the machine is moved upward, (b) shows the case where the water current generator is moved to the center, and (c) is the figure which shows the case where the water current generator is moved downward.

As shown in FIG. 1, a water current power generator 1 according to this embodiment includes a water current power generator 10 and a pedestal 2 to which the water current power generator 10 is attached via an elevating mechanism 20. The gantry 2 is formed by assembling steel pipes and the like in a cross beam shape. The gantry 2 in the water current power generation device 1 according to this embodiment is composed of three horizontal steel pipes 2a substantially horizontally and two orthogonal steel pipes 2b arranged so as to be substantially orthogonal to the horizontal steel pipes 2a. Above the generator 10, the distance between the steel pipes should be smaller than the size of the water generator 10 so as not to interfere with the horizontal steel pipe 2a and the orthogonal steel pipe 2b even when the water generator 10 is moved upward by the elevating mechanism 20. The retreat space S is formed so as to become larger.

The water current generator 10 includes a water turbine 11 that receives a water flow to obtain a rotational driving force, a rotary shaft 12 that is attached to the water turbine 11 to support the water turbine 11, and a rotary shaft that is connected to the other end of the rotary shaft 12. A generator 13 that receives the rotational driving force of 12 to generate electric power. A plurality of blades 11a are arranged on the water turbine 11 at predetermined intervals in the circumferential direction. As the shape of the blade 11a, various conventionally known shapes can be applied. Further, the generator 13 is a member that receives the rotational driving force of the rotary shaft 12 to generate electric power, and the structure thereof can employ the structure of various conventionally known generators. A configuration having a rotating coil stator and a magnet rotor including a plurality of magnets arranged so as to face the outer peripheral surface of the coil stator can be adopted.

As shown in FIG. 2, the water current generator 10 is attached to the generator mounting portion 14 attached to the moving member 21 of the elevating mechanism 20, and moves in the ascending/descending direction described later as the moving member 21 moves up and down. It is possible. In addition to the horizontal steel pipe 2a and the orthogonal steel pipe 2b, the gantry 2 includes a reinforcing portion 2c that extends substantially parallel to the orthogonal steel pipe 2b and contacts the elevating mechanism 20, and a truss reinforcing portion 2d that connects the elevating mechanism 20 and the horizontal steel pipe 2a. And has appropriate rigidity with respect to the moment load received by the elevating mechanism 20. In addition, a water level sensor 50 is attached to the lower end of the elevating mechanism 20 so that the relative distance between the water current power generation device 1 according to this embodiment and the water surface can be detected. The water level sensor 50 can adopt various conventionally known configurations, and may adopt any of a contact type and a non-contact type.

As shown in FIG. 3, it is preferable that the elevating mechanism 20 of the water current power generation device 1 according to the present embodiment uses an electric linear actuator, and the elevating mechanism 20 includes a housing 22 extending in the longitudinal direction, From the moving member 21 movably assembled to the housing 22, the nut member 31 attached to the moving member 21, and the screw shaft 32 penetrating the nut member 31 and rotatably attached in the circumferential direction. And a motor 33 that rotatably holds a screw shaft 32, and the moving member 21 is a guide device attached to an end of a side wall 23 of the housing 22 and is a straight line. It is attached to the moving block 42 of the guide device 40 and the nut member 31 of the ball screw device 30 so as to be reciprocally movable in the longitudinal direction. As shown in FIG. 2, the lifting mechanism 20 holds the water current generator 10 so that it can be lifted and lowered in the vertical direction. Further, the moving block 42 of the linear guide device 40 is attached to the moving member 21 that moves in accordance with the driving of the ball screw device 30, and is movable in the vertical direction.

As shown in FIG. 4, the housing 22 is provided with a pair of side walls 23 extending in the longitudinal direction and facing each other, and a bottom wall 24 connecting end portions of the side walls 23 to each other. It is a member formed into a shape and has sufficient rigidity as a support structure that supports the water current generator 10. Further, the side wall 23 and the bottom wall 24 are formed with lightening respectively, so that the weight of the entire apparatus can be reduced. Since the housing 22 is made of an aluminum alloy, it is possible to reduce the weight of the entire device and to easily form a complicated structure such as the above-described lightening and mounting portion 25. ing.

Also, at the upper and lower ends of the side wall 23, mounting portions 25 for mounting mating members are formed. The mounting portion 25 is a groove having a substantially T-shaped cross section that extends in the longitudinal direction, and has an enlarged diameter portion 25a and an insertion portion 25b. In such a mounting portion 25, a mating member can be mounted by assembling a nut or the like to the expanded diameter portion 25a and fastening a bolt inserted from the insertion portion 25b to the nut. For example, as shown in FIG. The elevating mechanism 20 and the gantry 2 can be assembled via the mounting bracket 3. Since the mounting portion 25 is formed along the longitudinal direction, the nut can be moved to any position on the expanded diameter portion 25a, and the mounting position of the elevating mechanism 20 can be freely set.

Further, a linear guide device 40 is attached to an end portion (an upper end in FIG. 4) of the side wall 23, and a track member extending along a longitudinal direction in a mounting portion 25 formed at the end portion of the side wall 23. 41 is attached, and a moving block 42 is attached to the track member 41 so as to be capable of reciprocating with respect to the track member 41. A plurality of rolling elements are held by a belt-shaped holding member and circulate between the track member 41 and the moving block 42, and the moving block 42 smoothly moves along the track member 41 while applying a load by the rolling elements. It is assembled so that it can be moved. The plurality of rolling elements are rolling element rolling grooves formed along the longitudinal direction of the raceway member 41 and load rolling element rolling grooves corresponding to the rolling element rolling grooves formed in the moving block 42. It rolls in an endless circulation path consisting of a running path, a rolling element return path that penetrates along the longitudinal direction of the moving block, and a direction changing path that connects the ends of the rolling element rolling path and the rolling element return path.

In addition, as shown in FIG. 3, the ball screw device 30 has a screw shaft 32 formed in a spiral shape with a predetermined lead on the outer peripheral surface thereof and extending along the axial direction, and the screw shaft 32. A nut member 31 having a through hole through which the shaft 32 penetrates, and a load rolling member thread groove which is opposed to the thread groove formed on the screw shaft 32 is formed on the inner peripheral surface of the through hole, and the thread groove and the load rolling member. A plurality of rolling elements are arranged between the screw groove and the screw groove, and the screw shaft 32 and the nut member 31 are screwed together. In the ball screw device 30 configured as described above, when the screw shaft 32 receives the rotational force by the motor 33, the nut member 31 moves along the axial direction of the screw shaft 32 due to the relative rotation with the nut member 31. Is configured to.

The screw shaft 32 is attached to the housing 22 along the longitudinal direction, and the axial direction of the screw shaft 32 is configured as the elevating direction of the elevating mechanism 20. Further, the rotary shaft 12 of the water current generator 10 and the lifting mechanism 20 are arranged so as to be located apart from each other in the circumferential direction of the rotary shaft 12. The motor 33 is connected to a power supply unit and a control device (not shown), and is rotated by the control device so that the position of the water turbine 11 is appropriately positioned below the water surface based on the state of the water level obtained from the water level sensor 50. Movement is controlled. In addition, it is preferable that the rotation of the screw shaft 32 can be switched between a case where it is automatically rotated by the motor 33 and a case where the screw shaft 32 is manually rotated by attaching an operating portion such as a handle to the shaft end of the screw shaft 32. ..

In this way, by rotating the screw shaft 32 by the motor 33 so as to move the water current generator 10 to an appropriate position according to the water level acquired by the water level sensor 50, the water flow power generation is automatically performed following the fluctuation of the water level. Since the position of the machine 10 can be adjusted, the power generation efficiency of the water current generator 10 can be stabilized.

Also, if the lifting mechanism 20 breaks down or if the position of the water current generator 10 needs to be adjusted urgently, it is possible to handle it flexibly because it can be operated manually.

The screw shaft 32 is held by a holding member (not shown) at the end on the motor 33 side, and the other end is a free end. Therefore, by making the water surface side end of the screw shaft 32, which serves as a guide shaft, a free end, the rotational movement of the screw shaft 32 is not hindered by the influence of water droplets splashing from the water surface. ..

As shown in FIG. 5, in the water current power generation device 1 according to the present embodiment, by moving the moving member 21 of the lifting mechanism 20 upward as shown in (a), the generator so as to penetrate the retreat space S. Since 13 can be arranged, the stroke of the lifting mechanism 20 can be fully utilized to move the position of the water turbine 11 to the highest position.

Further, as shown in FIG. 5B, by moving the moving member 21 to the lower side of the elevating mechanism 20, the position of the water current generator 10 can be set to the lowest position, and the water level detected by the water level sensor 50 can be adjusted. Depending on the state, it is possible to adjust the position of the water current generator 10 so that the water turbine 11 is appropriately placed in the water.

Further, since the elevating mechanism 20 has the groove-shaped mounting portion 25 extending in the longitudinal direction as described above, as shown in FIGS. 6A to 6C, the elevating mechanism 20 moves in the elevating direction with respect to the gantry 2. It is mounted so that the mounting position can be changed. Since the mounting position of the lifting mechanism 20 can be freely adjusted in this manner, the lifting mechanism 20 can be mounted at an appropriate depth according to the installation location of the hydroelectric generator 1. Further, when the fluctuation of the water level at the place where the hydroelectric generator 1 is installed greatly changes beyond the stroke of the lifting mechanism 20, as shown in FIGS. By changing the mounting position of the elevating mechanism 20, the water turbine 11 can be adjusted to be appropriately positioned below the water surface.

[Second Embodiment]
As above, in the water current power generation device 1 according to the first embodiment described above, the case where the water current power generator 10 is attached via the power generator attachment portion 14 attached to the moving member 21 of the lifting mechanism 20 has been described. The water current power generation device according to the second embodiment described below describes another method of attaching the water current power generator. In addition, about the member which is the same as or similar to 1st Embodiment mentioned above, the same code|symbol is attached|subjected and detailed description is abbreviate|omitted.

FIG. 7 is a front view of a water current power generation device according to a second embodiment of the present invention.

As shown in FIG. 7, the water current power generator 1a according to the present embodiment differs from the water current power generator 1 according to the first embodiment in the method of mounting the water current generator 10a. In the water current generator 10a according to the present embodiment, the mounting arm 15 is integrally formed from the housing of the generator 13a, and the mounting arm 15 can be directly mounted on the moving member 21 of the lifting mechanism 20. Is configured.

Thus, by integrally forming the mounting arm portion 15 in the housing of the generator 13a, a member for attaching the generator to the moving member 21 such as the generator mounting portion 14 becomes unnecessary, and the number of parts is reduced. This makes it possible to reduce the manufacturing cost.

[Third Embodiment]
In the above-described water flow power generation devices according to the first and second embodiments, the case where the elevating mechanism 20 is arranged in a direction substantially orthogonal to the water surface has been described. In the water current power generation device according to the third embodiment to be described next, a mounting mode in which the lifting mechanism is different will be described.

FIG. 8 is a front view of a water current power generation device according to a third embodiment of the present invention.

As shown in FIG. 8, an elevating mechanism 20 is attached to the pedestal 2 tilted from the vertical direction. Since the elevating mechanism 20 is attached to the gantry 2 via the mounting metal fitting 3a, the mounting metal fitting 3a has a predetermined angle unlike the water current power generation devices according to the first and second embodiments. It is possible to incline and attach the lifting mechanism 20 to the gantry 2.

In addition, the water current generator 10 is attached to the moving member 21 of the lifting mechanism 20 via the generator mounting portion 14a, and the generator mounting portion 14a includes a bottom surface 14b and a bottom surface 14b that are arranged substantially parallel to the water surface. It has a side surface 14c which stands upright at a predetermined angle.

By mounting the elevating mechanism 20 in this way, even if the elevating mechanism 20 cannot be guided in the vertical direction, such as when the hole H is formed obliquely from the ground surface L, the water current generator 10 can be installed. Therefore, the position of the water turbine 11 can be appropriately arranged below the water surface by following the fluctuation of the water surface.

In addition, in the above-described embodiment, the case where the linear guide device 40 and the ball screw device 30 each use a member having a circulation structure using rolling elements has been described. Both may use element members having a sliding structure that does not use rolling elements. Further, the ball screw device is not limited to the ball screw device as long as the moving member can be moved along the guide shaft, and for example, a rack and pinion mechanism may be used. It is apparent from the description of the scope of claims that a form added with such changes or improvements can be included in the technical scope of the present invention.

1,1a water flow generator, 2 mounts, 10 water flow generators, 11 water wheels, 12 rotating shafts, 13 generators, 20 lifting mechanisms, 21 moving members, 22 housings, 23 side walls, 24 bottom walls, 32 guide shafts (screw shafts) ).

Claims

A water turbine that receives a water flow and obtains rotational driving force,
A rotating shaft that rotatably supports the water turbine,
A water current generator having a generator connected to the rotating shaft to generate electric power by receiving the rotational driving force,
A stand for suspending the water flow generator,
An elevating device for a water current generator, which connects the water current generator and the gantry, holds the water current generator so that the water current generator can be moved up and down, and is provided with an elevating mechanism that is located away from each other in the circumferential direction of the rotating shaft. ..
In the lifting device for a water current generator according to claim 1,
The elevating mechanism has a guide device movable in the elevating direction of the water current generator, a drive device for driving the guide device in the elevating direction, and a moving member to which the guide device and the drive device are assembled,
The lifting device for a water current generator, wherein the water current generator is attached to the moving member.
The lifting device for a water current generator according to claim 1 or 2,
The elevating device for a water current generator, wherein the elevating mechanism is attached to the pedestal so that an attachment position can be changed in an elevating direction.
The lifting device for a water current generator according to claim 2,
The drive device includes a screw shaft extending in a vertical direction, one end of the screw shaft is fixed by a support member, and the other end is arranged at a free end.
A water flow power generation device comprising the lifting device for a water flow power generator according to any one of claims 1 to 4.