JP2014201882A - Intake screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake screen that assumes a simple shape and that has a self-cleaning effect.SOLUTION: An intake screen 100 includes: a plate-like substrate 1 that is fixed to a river bottom; a frame body 2 that is joined to the substrate 1 and arranged in such a manner as to surround an intake 201 in a front view of the intake 201; and a plurality of supports 3, the other-side ends 3b of which are radially arranged outside the frame body 2 in such a manner that one-side ends 3a on the substrate 1 serve as starting points in a front view of the frame body 2.

Description

  The present invention relates to a water intake screen installed at a water intake of a hydroelectric generator, and more particularly to a water intake screen installed at a water intake of a micro hydroelectric generator.

Hydropower generators have a large hydropower of 100,000 kW or more, a medium hydropower of 10,000 to 100,000 kW, a small hydropower of 1000 kW to 10,000 kW, a mini hydropower of 100 kW to 1000 kW, and a micro hydropower of 100 kW or less. It is classified into hydropower and picohydropower of 1 kW or less.
Of these, the micro hydropower generator is relatively small and can be installed with a certain amount of water, and can be installed in the river while maintaining the current state of the river. There is a feature that there is little concern about threatening the ecosystem.

Since micro hydroelectric generators are installed in nature, naturally, waste such as dead leaves, weeds, branches or aquatic plants will flow in, and in some cases, household waste such as vinyl, string, plastic bottles or polystyrene foam will flow in. Will do.
For this reason, in the micro hydroelectric generator, a grid-like screen is installed on the upstream side so that long garbage that prevents rotation of the water turbine in the generator does not flow into the generator.
However, when the fallen leaves are in bad condition or the weather is bad, more leaves and branches flow through the river than usual, causing screen clogging, preventing water from flowing into the generator, and the desired amount of power generated by the generator. It can no longer be obtained.
For this reason, it is conceivable to install a movable screen such as a water treatment plant or a dust removal device that removes dust (dust) collected on the screen for the micro hydropower generator. It does not match the output scale of the machine.

  On the other hand, the conventional water intake cover is made of bamboo material arranged with a gap through which running water can pass through the water intake to which the screen is attached, and the portion located below a predetermined height is the surface of each part. And the portion of the straight line connecting each part and the lower end of the water intake is 45 ° or less, and the portion located above a predetermined height is formed by connecting the surface of each part and each part and the lower end of the water intake. A screen cover formed so that the angle with the connecting straight line is 45 ° or more is attached with one end fixed to the upper part of the water inlet and the other end fixed to the water bottom upstream of the water outlet (for example, Patent Document 1). .

JP 2010-150830 A

  However, the conventional water intake cover requires a worker to collect wood pieces or the like stopped on the upper part of the screen cover at an appropriate timing, and there is a problem that the cost of maintenance is increased.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a water intake screen having a simple shape and having a self-cleaning effect.

  In the water intake screen according to the present invention, a plate-like base fixed to the riverbed, a frame joined to the base and surrounding the water intake in a front view of the water intake, and a frame And a plurality of supports, the other ends of which are arranged radially outside the frame body, starting from one end on the base in front view.

  Since the disclosed screen for a water intake is a combination of plate-like members, it is easy to produce and has the effect of suppressing the retention of dust on the screen.

(A) is a perspective view which shows schematic structure of the screen for water intakes which concerns on 1st Embodiment, (b) is a perspective view which shows schematic structure of a micro hydraulic power generator. (A) is a front view of the screen for water intakes shown to Fig.1 (a), (b) is a rear view of the screen for water intakes shown to Fig.1 (a). (A) is a left side view of the water intake screen shown in FIG. 1 (a), and (b) is a right side view of the water intake screen shown in FIG. 1 (a). (A) is a top view of the screen for water intakes shown to Fig.1 (a), (b) is a bottom view of the screen for water intakes shown to Fig.1 (a). (A) is a front view which shows the state which mounted | wore the microhydropower generator with the water intake screen, (b) is a perspective view which shows schematic structure of the other water intake screen which concerns on 1st Embodiment. . (A) is a perspective view for demonstrating the effect of the water intake screen shown to Fig.1 (a), (b) is for demonstrating the effect of the water intake screen shown in FIG.3 (b). FIG.

(First embodiment of the present invention)
As shown in FIG. 1 and FIG. 5A, the intake screen 100 is installed in the vicinity of the intake 201 of the micro hydroelectric generator 200, and takes in waste that prevents rotation of the water turbine 202 in the micro hydroelectric generator 200. Inflow into the mouth 201 is prevented.
The water intake screen 100 is joined to a plate-like base body 1 fixed to the riverbed by welding or screwing substantially perpendicularly to the base body 1, and a front view of the water intake 201 (see FIG. 2A). And the plate-like frame 2 disposed so as to surround the water intake 201, and the other end 3b radiating from the one end 3a on the base 1 in the front view of the frame 2 (see FIG. 2A). And a plurality of supports 3 arranged outside the frame body 2.

  In addition, the base | substrate 1 which concerns on this embodiment is the planar shape which cut off the inside of an isosceles trapezoid by the isosceles trapezoid smaller than the said isosceles trapezoid as shown in FIG.4 (b), and is formed with the iron plate. However, as long as it has an area where the frame body 2 and the support body 3 can be joined, the planar shape and the material are not limited.

Moreover, as shown in FIGS. 2B and 1B, the frame 2 according to the present embodiment has a substantially U-shaped planar shape that coincides with the upper side and both sides of the outer frame 201a of the water intake 201. Although it is formed of an iron plate, if it has an area where water of a desired amount of water can flow into the water inlet 201 and the support 3 can be joined, it is not limited to this planar shape and material. Absent.
The frame body 2 is fastened to the outer frame 201a of the water intake 201 by bolts and nuts (not shown).

  Further, as shown in FIG. 3, the support body 3 according to the present embodiment has a planar shape of a substantially right triangle (for example, a regular triangle), and the base 31 a is joined to the base body 1 by welding, screwing, or the like. It is a plate-like body (iron plate) having an upward oblique side 31b from the side to the frame body 2, but one end 3a is disposed on the base body 1 in the front view of the frame body 2 (see FIG. 2A), and the other end 3b. If it is arrange | positioned on the outer side of the frame 2, it will not be restricted to the plate-shaped body of this planar shape and material. For example, the support 3 may be a rod-shaped body having the other end 3b as a bent portion, straight portions corresponding to the hypotenuses 31b and the drooping sides 31c of the plate-like body, and both ends joined to the base 1.

  The plurality of supports 3 are joined to the center of the frame 2 in the front view of the frame 2 (see FIG. 2A) by welding or screwing substantially vertically to the base 1 and the frame 2. One plate-like body (hereinafter referred to as a central plate-like body 32) and a plurality of other plate-like bodies (hereinafter referred to as sides) formed with the same number and shape symmetrically with respect to the central plate-like body 32 as a reference (Referred to as a plate-like body 33).

  As shown in FIGS. 1 and 2, the support 3 according to the present embodiment is a lateral plate-like body 33 that is a total of 12 plate-like bodies each having six left and right sides, and adjacent support bodies 3 (centers). The angle formed between the bases 31a of the plate-like body 32 and the side plate-like body 33) is the same in plan view of the base 1 (see FIG. 5A) (for example, each side plate-like body 33 is The central plate-like body 32 is opened at intervals of 6 °, and is arranged in a fan shape.

For example, when the supports 3 (the central plate 32 and the side plates 33) are arranged in parallel with each other along the river flow, the long garbage along the river flow is Then, it passes through between the adjacent supports 3 and flows into the frame 3 (water intake 201).
On the other hand, since each support body 3 (central plate-like body 32, side plate-like body 33) according to the present embodiment is arranged in a fan shape, the long garbage along the river flow is Then, it collides with the main surface of the support 3, rotates by a water flow with the tip of the long garbage as a fulcrum, and rides on the hypotenuse 31 b of the adjacent support 3. Then, the long garbage flows downstream along the hypotenuse 31b and is pushed out to the outside of the frame 2 (water intake 201).

  Each side plate 33 has a main surface inclined with respect to the base 1, and the inclination angle of the main surface of each side plate 33 with respect to the base 1 is the outermost side plate. 33 (hereinafter referred to as the first plate-like body 33a) and the central plate-like body 32 become larger at a certain rate (for example, each side plate-like body 33 rises every 6 ° with respect to the base 1). ing).

For example, when the main surface of the side plate-shaped body 33 is not inclined with respect to the base body 1, the long-sized dust is directed to the upper side of the frame body 2 along the oblique side 31 b and is integrated with the waste. However, there is a risk of entanglement with the generator 203 at the top of the micro hydroelectric generator 200.
On the other hand, since the main surface of the side plate 33 according to the present embodiment is inclined with respect to the base body 1, the long dust is only above the frame 2 along the oblique side 31 b. Instead, it goes to the side of the frame 2, so that the dust is dispersed and the entanglement in the generator 203 at the top of the micro hydroelectric generator 200 can be suppressed.

In the micro hydroelectric generator 200 shown in FIG. 1B, since the generator 203 protrudes above the water intake 201, the water intake 201 in the front view of the frame 2 (see FIG. 2A). By positioning the other end 3b of the support body 3 located above the outer frame 201a so as to exceed the height of the generator 203, it is possible to prevent entanglement of dust in the generator 203.
Further, in the front view of the frame body 2 (see FIG. 2A), the interval between the left and right first plate bodies 33a is wider than the width of the water intake 201, and the river in which the micro hydroelectric generator 200 is installed. By making it narrower than the width of the river, the dust pushed out along the hypotenuse 31b of the support 3 can be passed between the frame 2 and the riverbank.

  Further, as shown in FIGS. 1 (a), 2 (b) and 3, the support 3 (central plate-like body 32, side plate-like body 33) excluding the first plate-like body 33a, The vertical side 31c is joined to the frame 2 by welding or screwing, and the first plate 33a and the side plate 33 adjacent to the first plate 33a (hereinafter referred to as the second plate). 33b), each support body 3 has an opening 3c of a substantially right triangle (e.g., equilateral triangle) whose outer edge is reduced.

The opening 3c serves as a water channel for allowing water to flow downstream. However, the opening 3c is not provided in the first plate 33a and the second plate 33b, so that dust is collected from the intake screen. Inflow from the both sides of the frame 100 into the frame 2 (water intake 201) is prevented.
In addition, the arrangement of the opening 3c may cause dust to be caught in the downstream edge of the opening 3c, and the dust to be retained in the water intake screen 100. For this reason, as shown in FIG. 5 (b), the support 3 (the central plate 32, the side plate 33) retains garbage by cutting the downstream edge of the opening 3c. The structure which prevents this may be sufficient. Further, the support 3 (center plate-like body 32, side plate-like body 33) has a structure in which the smoothness of the water flow between the adjacent support bodies 3 is lost, but the opening 3c is not formed. May be.

Next, the function and effect of the water intake screen 100 according to the present embodiment will be described with reference to FIG.
When the waste flowing through the river contacts the main surface or the oblique side 31b of the first plate-like body 33a or the second plate-like body 33b, it moves to the downstream side of the side of the frame 2 along the principal surface or the oblique side 31b. Then, it is pushed out from the other end 3b side outside the frame body 2 and flows downstream, so that inflow of dust into the frame body 2 (water intake port 201) can be prevented.

  Further, when the dust flowing through the river contacts the side plate body 33 or the center plate body 32 other than the first plate body 33a and the second plate body 33b, the waste of the frame 2 along the hypotenuse 31b. It moves to the upper downstream side and stops near the intersection of the water surface of the river and the hypotenuse 31b. Then, the stopped garbage is pushed out from the other end 3b outside the frame body 2 by increasing the water level in the rainy weather and rising the water level, overflows the micro hydroelectric generator 200, and the frame body 2 (water intake 201). ) Can be prevented from flowing on the support 3 (water intake screen 100) without flowing into the inside.

  As described above, the water intake screen 100 according to the present embodiment includes a plurality of the other ends 3b that are radially arranged outside the frame 2 starting from the one end 3a on the base body 1 when the frame 2 is viewed from the front. By providing the support 3, the waste reaching the micro hydropower generator 200 from the upstream side can be efficiently overflowed to the downstream side while taking a desired amount of water into the water inlet 201, and the micro hydro power generation There is an effect that dust can be prevented from flowing into the machine 200.

  In particular, the water intake screen 100 according to the present embodiment can be manufactured only by a combination of iron plates, and the manufacturing process is simple, and there is an effect that the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Base | substrate 2 Frame body 3 Support body 3 Frame body 3a One end 3b Other end 3c Opening part 31a Bottom 31b Oblique side 31c Perpendicular side 32 Central plate-shaped body 33 Lateral plate-shaped body 33a 1st plate-shaped body 33b 2nd plate shape Body 100 Screen for water intake 200 Micro hydroelectric generator 201 Water intake 201a Outer frame 202 Water wheel 203 Generator

Claims (3)

In the intake screen installed at the intake of the hydroelectric generator,
A plate-like base fixed to the riverbed;
A frame body joined to the base body and disposed so as to surround the water intake port in a front view;
A plurality of supports disposed on the outside of the frame radially starting from one end on the base body in front view of the frame;
A water intake screen, characterized by comprising: The water intake screen according to claim 1,
The intake screen according to claim 1, wherein the support is a plate-like body having a base joined to the base and having an oblique side upward from the upstream side to the frame. The water intake screen according to claim 2,
The plurality of supports are bilaterally symmetric with respect to the one plate-like body and one plate-like body joined substantially perpendicularly to the base body and the frame body in the center of the frame body in a front view of the frame body. And a plurality of other plate-like bodies formed in the same number and shape.

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