Water intake device

Abstract

To provide a water intake device that can easily remove debris accumulated in a flow path.SOLUTION: A water intake device 1 has: a flow path bottom surface 3 extending from upstream to downstream; and both side surfaces 4 standing upright from the flow path bottom surface 3. A concrete block forming one side surface 4 is integrally formed with a basin 5 storing taken water and a water conduit pipe 6 making the basin 5 communicate with a hydroelectric power generation facility. A water intake tank 7 is provided between the side surfaces 4. The water intake tank 7 is provided at a distance from the flow path bottom surface 3, and a bottom flow path 8 is formed between the water intake tank 7 and the flow path bottom surface 3. A screen 9 covering an opening 7e of the water intake tank 7 is provided at the opening 7e. A slide gate 10 that can move up and down along an upstream wall 7a of the water intake tank 7 is provided upstream of the water intake tank 7. When the slide gate 10 descends, the bottom flow pathe 8 is closed by the slide gate 10. The slide gate 10 can be manually moved up and down by an operation handle 11.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a water intake device that can be installed in rivers or agricultural irrigation canals, and more specifically to a water intake device that can easily remove garbage that has accumulated on a screen attached to a water intake tank. [Background technology]

[0002] Conventionally, water intake devices that have a function of removing garbage accumulated on a screen attached to a water intake tank are known. Patent Document 1 discloses a water intake device that is attached to a water intake tank and includes an inclined upstream screen and a horizontal downstream screen. Water from upstream flows into the water intake tank through the upstream screen and the downstream screen, and is sent from the water intake tank to a water-using facility through an inlet pipe. Excess water that does not flow into the water intake tank flows downstream through the upstream screen and the downstream screen. In addition, garbage such as dead leaves and branches that are larger than the mesh diameter of the upstream screen and the downstream screen are accumulated on the horizontally attached downstream screen. The accumulated garbage can be backwashed by overflowing the water intake tank with water and washed downstream. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6842068 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional water intake devices, the garbage that flows through the downstream screen accumulates again downstream. In other words, there is a problem that the garbage simply accumulates in a different location and the deposits must be removed. In addition, sediment also flows into the intake tank through the upstream and downstream screens, so there is a problem that the sediment must be removed from the intake tank.

[0005] An object of the present invention is to provide a water intake device which makes it easy to remove debris accumulated in a flow path and eliminates the need for work to remove sediment from the intake tank. [Means for solving the problem]

[0006] This invention is a water intake device having a bottom and both side surfaces, comprising a water intake tank located between the both sides and formed by an upstream wall, a downstream wall, one side wall, the other side wall and a bottom wall, the water intake tank having an opening facing the bottom wall, a screen covering the opening, a slide gate that can move up and down, and a water conveyance pipe connecting the water intake tank to a water-using facility, wherein when the slide gate is raised, a direct route connecting the upstream and downstream is opened, and when the slide gate is lowered, the direct route is closed, and upstream water flows through the water intake route toward the opening of the water intake tank. By lifting the slide gate and switching from the intake route to the direct route, the garbage downstream of the intake tank can be washed away and removed. In addition, the sediment that has accumulated upstream of the slide gate can be removed by following the flow of the direct route. An upstream wall is installed in the intake tank, which prevents sediment from flowing into the tank. Therefore, no additional tools are required to remove the garbage and sediment, making them easy to remove.

[0007] The water intake tank is characterized in that the bottom wall is spaced above the bottom surface, one of the side walls is connected to one of the side surfaces and the other of the side walls is connected to the other side surface, and a direct route is formed between the bottom surface and the bottom wall of the water intake tank. By locating the slide gate upstream or downstream of the intake tank, the direct route and the intake route can be formed vertically one above the other, which is particularly suitable for installation in narrow and deep waterways. In addition, the intake tank can be formed integrally with both sides, making installation easy and low cost.

[0008] The water intake tank is characterized in that the bottom wall is connected to the bottom surface, the slide gate is adjacent to one of the side walls of the water intake tank, and the direct route is formed between the bottom surface and the lower end of the slide gate. By arranging the slide gates adjacent to each other in the width direction of the intake tank, the direct route and the intake route can be formed side by side in the width direction, which is particularly suitable for installation in wide and shallow waterways. In addition, the intake tank can be formed integrally with the bottom surface, which allows for easy and low-cost installation.

[0009] A roof covering the opening is provided above the water intake tank. Providing a roof can prevent snow from accumulating on the screen, preventing a decrease in water intake due to snow accumulation.

[0010] The present invention is characterized in that a regulating valve for regulating the amount of water flowing into the water pipe is further provided, and the amount of water flowing into the water pipe is reduced by the regulating valve, thereby causing the water in the water intake tank to overflow. The overflow allows the garbage on the screen to float up from below and flow downstream, preventing a decrease in water intake due to garbage accumulation on the screen. Effect of the Invention

[0011] According to the water intake device of the present invention, by moving the slide gate up and down and switching the water flow from the water intake route to a direct route, garbage downstream of the water intake tank can be washed away and removed. Since the water intake tank is provided with an upstream wall, it is possible to prevent sediment from flowing into the water intake tank. In addition, sediment that has accumulated upstream of the slide gate can also be washed away and removed. Therefore, no additional tools are required to remove the garbage and sediment, making them easy to remove. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a plan view of the water intake device according to the first embodiment. [Diagram 2]Cross-sectional view of line II-II in Figure 1. [Diagram 3] Cross-sectional view of line III-III in Figure 2. [Figure 4] Cross-sectional view taken along line IV-IV in Figure 1. [Diagram 5] Cross-sectional view of line VV in Figure 1. [Figure 6] FIG. 4 is a view similar to FIG. 3 of a water intake device according to a second embodiment. [Figure 7] Cross-sectional view taken along line VII-VII in Figure 6. [Figure 8] Cross-sectional view taken along line VIII-VIII in Figure 7. [Figure 9] Cross-sectional view taken along line IX-IX in Figure 6. [Figure 10] FIG. 11 is a plan view of a water intake device according to a third embodiment. [Figure 11] FIG. 11 is a partially enlarged cross-sectional view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The water intake device 1 of the present invention can be installed in rivers, irrigation channels, etc. In this embodiment, the case where the device is installed in an irrigation channel will be described as an example. Water taken from an irrigation channel or the like is used in water-using facilities such as waterworks facilities and hydroelectric power generation facilities. In this embodiment, the case where the device is used in a hydroelectric power generation facility (not shown) will be described.

[0014] (First embodiment) (Water intake device 1) Figures 1 to 5 show a first embodiment of the present invention. The water intake device 1 has a bottom surface 3 extending from upstream to downstream, and side surfaces 4, 4 standing up from the bottom surface 3. In this embodiment, the bottom surface 3 and both side surfaces 4, 4 are made of concrete. By using concrete, the structure of the water intake device 1 can be formed in advance and the device can be installed simply by assembling the formed parts on-site, making it possible to install the device easily and in a short time. In Figures 1 to 3, the right side of the drawings is the upstream side, and the left side of the drawings is the downstream side. In Figures 4 and 5, the front side of the drawings is the upstream side, and the back side of the drawings is the downstream side.

[0015] The concrete block forming one side 4 is integrally formed with a manhole 5 for storing the taken water and a water pipe 6 connecting the manhole 5 to the hydroelectric power generation facility. In this way, the manhole 5 and the water pipe 6 can be formed integrally with the side 4, allowing for easy and quick installation. Referring to Fig. 2, the bottom surface 3 slopes downward from the upstream to the downstream. In this embodiment, the angle of inclination is approximately 6.0%.

[0016] (Water intake tank 7) A water intake tank 7 is provided between the side surfaces 4, 4. The water intake tank 7 is formed by an upstream wall 7a, a downstream wall 7b, a pair of side walls 7c, 7c, and a bottom wall 7d, and has an opening 7e on its upper surface. The bottom wall 7d is approximately horizontal, and the upstream wall 7a, downstream wall 7b, and the pair of side walls 7c stand approximately vertically from the bottom wall 7d. The height dimension of the upstream wall 7a is greater than that of the downstream wall 7b, and the opening 7e is inclined downward from the upstream to the downstream. The intake tank 7 has a pair of side walls 7c, 7c connected to the side surfaces 4, 4, respectively, and in this embodiment can be formed integrally with both side surfaces 4, allowing for low-cost installation. The intake tank 7 is provided spaced above the bottom surface 3, and a bottom flow path 8 is formed between the intake tank 7 and the bottom surface 3. Since the intake tank 7 is provided spaced above the bottom surface 3, the flow is not blocked by the intake tank 7, and sediment can be prevented from accumulating in the water intake device 1. In addition, since the intake tank 7 is provided with an upstream wall 7a, sediment can also be prevented from flowing into the intake tank 7.

[0017] (Screen 9) A screen 9 is provided to cover the opening 7e of the intake tank 7. A steel lattice-like cover known as a grating can be used as the screen 9. Covering the opening 7e with the screen 9 prevents fallen leaves and other debris from flowing into the intake tank 7, while allowing water to be introduced into the intake tank 7.

[0018] (Slide Gate 10) A slide gate 10 that can move up and down along the upstream wall 7a of the intake tank 7 is provided upstream of the intake tank 7. When the slide gate 10 is lowered, particularly when it is at the lowest position, its lower end 10a abuts against the bottom surface 3 and its upper end 10b is positioned higher than the lower end of the upstream wall 7a of the intake tank 7, so that the bottom flow path 8 is closed by the slide gate 10. The slide gate 10 can be manually moved up and down using an operating handle 11.

[0019] (Direct Route A) When the slide gate 10 is raised, the bottom flow passage 8 is opened, and the upstream water flows through the bottom flow passage 8 and the direct route A that passes directly through the bottom surface 3. In the direct route A, there are almost no obstacles that impede the flow, so the flow rate does not decrease.

[0020] (Water Intake Route B) When the slide gate 10 descends, the bottom flow path 8 is closed, and the upstream water is blocked and rises, passing over the upper end of the upstream wall 7a of the water intake tank 7 and flowing out to the opening 7e, forming the water intake route B. A part of the water passing through the opening 7e flows into the water intake tank 7 through the screen 9, while the rest moves downstream on the screen 9, passes over the downstream wall 7b, and flows back to the bottom surface 3.

[0021] (Roof 12) A roof 12 is provided above the intake tank 7. The roof 12 is provided across both side surfaces 4, and is made of concrete blocks in this embodiment. The slide gate 10 is attached to the concrete that constitutes the roof 12. In addition, an operating handle 11 for moving the slide gate 10 can be attached to the roof 12. Providing the roof 12 makes it possible to prevent snow from accumulating on the screen 9. Also, the operating handle 11 can be operated using the roof 12 as a foothold.

[0022] In the water intake device 1 configured as described above, when water is to be sent to a water-using facility such as a hydroelectric power plant, the slide gate 10 is lowered to close the bottom flow path 8 and guide the water to the water intake route B. That is, water flowing from an upstream area such as an agricultural irrigation channel is blocked by the slide gate 10 and flows downstream over the upstream wall 7a of the water intake tank 7. A part of the water flowing downstream flows into the water intake tank 7 through the screen 9 and is sent to the hydroelectric power plant through the water conveyance pipe 6. The other part of the water flowing downstream continues to flow over the screen 9, falls over the downstream wall 7b of the water intake tank 7 and drops to the bottom surface 3. The water flowing downstream over the bottom surface 3 is used as normal agricultural water.

[0023] (Cleaning screen 9 with running water) During operation with the above-mentioned water intake route, the garbage remains on the screen 9, and only the water that passes through the screen 9 flows into the water intake tank 7. Since the screen 9 is inclined downward toward the downstream, the garbage left on the screen 9 falls from the downstream wall 7b together with the water flowing over the screen 9 and is swept away. In other words, the garbage on the screen 9 can be cleaned by the running water. Therefore, garbage does not accumulate on the screen 9, and it is possible to prevent clogging that makes it difficult for water to flow into the water intake tank 7.

[0024] (Cleaning screen 9 due to overflow) Depending on the size of the garbage and the amount of water flowing over the screen 9, garbage may remain on the screen 9. In that case, the amount of water flowing into the water pipe 6 is reduced by the regulating valve, and the water in the water intake tank 7 is allowed to overflow, thereby removing the garbage. The regulating valve may be a regulating valve installed on the water wheel of the hydroelectric power generation device, or a valve installed separately on the water pipe may be used. In either case, the regulating valve reduces the amount of water flowing into the water pipe 6 at regular intervals, raising the water level of the water intake tank 7, and allowing the water to overflow from the opening 7e. The garbage on the screen 9 can be washed away by being lifted from below by the overflow water. Therefore, even if garbage remains on the screen 9, it can be periodically removed and cleaned by overflow.

[0025] (Cleaning the bottom 3) The garbage removed by cleaning with running water and cleaning with overflow falls to the water fall point on the bottom surface 3, but sometimes this fallen garbage may accumulate at the water fall point. When the slide gate 10 is lowered, the slide gate 10 closes the upstream of the water fall point, so the amount of water flowing downstream is reduced and the fallen garbage is likely to accumulate. When garbage accumulates at the water fall point in this way, the slide gate 10 is raised, the bottom flow path 8 is opened, and the water from upstream is allowed to flow into the direct route A. Because the water is blocked and stored upstream of the slide gate 10, it flows out all at once, washing away the garbage accumulated at the water fall point and cleaning the bottom surface 3.

[0026] (Removal of sediment upstream of slide gate 10) When the slide gate 10 descends, that is, when water is taken in through the water intake route B, the water flowing from the upstream is dammed and stored. At that time, sediment from the upstream is also deposited on the upstream side of the slide gate 10. Conventionally, in order to prevent sediment from the upstream from flowing into the water intake tank 7, a separate grit basin had to be installed upstream of the water intake tank. However, according to the water intake device 1 of this invention, the slide gate 10 has the function of a grit basin, so there is no need to install a separate one. In addition, when removing sediment deposited upstream of the slide gate 10, it is only necessary to switch to the direct route A. By switching to the direct route A, the deposited sediment is swept downstream through the bottom flow path 8 together with the large amount of stored water. In the direct route A, the bottom surface 3 is inclined downward toward the downstream side, so the sediment deposited on the bottom surface 3 is swept downstream quickly. Therefore, for example, there is no need to install a device for removing sediment or to remove it manually.

[0027] As described above, by switching the water flow to direct route A, it is possible to remove both fallen leaves and other debris that has accumulated at the water outlet point and sediment that has accumulated at the slide gate at the same time. Switching between direct route A and water intake route B is accomplished simply by moving slide gate 10 up and down, and moving slide gate 10 up and down is accomplished simply by turning operating handle 11, making these operations easy.

[0028] According to the first embodiment, by arranging the slide gate 10 upstream of the water intake tank 7, the direct route A and the water intake route B can be formed vertically one above the other. Therefore, the slide gate 10 can be suitably installed in a waterway that is particularly narrow and deep. In this embodiment, the slide gate 10 is arranged upstream of the water intake tank 7, but it can also be arranged downstream. The slide gate 10 is arranged so as to be able to block the bottom flow path 8 that forms the direct route A.

[0029] Second embodiment 6 to 9 show a second embodiment of the present invention. The same components as those in the first embodiment are given the same reference numerals as in the first embodiment, and the details thereof will be omitted. The second embodiment is characterized in that a direct route A and a water intake route B are formed side by side in the width direction of the waterway.

[0030] In the second embodiment, the water intake tank 7 is provided directly on the bottom surface 3 of the water intake device 1. That is, the bottom wall 7d of the water intake tank 7 is connected to the bottom surface 3. The slide gate 10 is provided adjacent to one side wall 7c of the water intake tank 7, so that the water intake tank 7 and the slide gate 10 are arranged side by side in the width direction of the waterway. With this configuration, a direct route A is formed below the slide gate 10 when the slide gate 10 is raised, and when the slide gate 10 is lowered, the direct route A is closed and a water intake route B is formed above the water intake tank 7.

[0031] When the slide gate 10 is lowered, particularly when it is at the lowest position, its lower end 10a abuts against the bottom surface 3, and its upper end 10b is positioned above the upper end of the upstream wall 7a of the water intake tank 7. Therefore, when the slide gate 10 is lowered, the direct route A is closed, and the water flows toward the water intake tank 7 and overflows the upstream wall 7a, forming the water intake route B. The water that overflows the upstream wall 7a flows into the water intake tank 7 through the screen 9.

[0032] When the slide gate 10 is raised, a direct route A opens to the side of the water intake tank 7 and below the slide gate 10. The water that has overflowed the upstream wall 7a flows forcefully through the direct route, washing away the sediment that has accumulated upstream of the slide gate 10 and the garbage downstream of the water intake tank 7 downstream. In the water intake device 1 configured in this way, sediment tends to accumulate on the upstream side of the upstream wall 7a, but the accumulated sediment can be washed away as if it were drawn into the flow of the direct route A.

[0033] In the second embodiment as described above, the screen 9 can be cleaned by overflow, as in the first embodiment. In the second embodiment, the direct route A and the water intake route B can be formed side by side in the width direction of the waterway, so that the device can be suitably installed in a wide and shallow waterway.

[0034] (Third embodiment) The water intake device 1 as in the first and second embodiments can further include an overflow plate 15 and a receiving plate 16. In this embodiment, the water intake device 1 in the first embodiment will be described as an example. 10 and 11, the overflow plate 15 is attached to the upper end of the upstream wall 7a of the intake tank 7, and covers a part of the upstream end of the screen 9. The overflow plate 15 has a base end 15a that is connected to the upstream wall 7a, and an extended end 15b that faces the base end 15a and extends onto the screen 9. The extended end 15b can have multiple concave portions with small dimensions from the base end 15a and multiple convex portions with large dimensions from the base end 15a arranged alternately to form a wavy shape.

[0035] By providing the overflow plate 15, the force of the water flowing into the water intake tank 7 can be reduced. If the flow velocity is high and the force remains strong, the water will bounce off the screen 9, and the amount of water flowing into the water intake tank 7 will decrease. By reducing the flow velocity upstream of the water intake tank 7 and causing the water to fall at a position away from the upstream wall 7a, the adhesion of garbage to the screen 9 can be reduced and the water can be efficiently guided to the water intake tank 7. In addition, by providing a recess and a protrusion on the extension end 15b, the water falls at a position relatively close to the upstream wall 7a in the recess and at a position farther away in the protrusion. Therefore, the position of the falling water can be dispersed, further reducing the force of the entire inflow water and allowing it to flow into the water intake tank 7 efficiently. In this embodiment, the extending end 15b of the overflow plate 15 is provided with projections and recesses, but this is not an essential configuration, and the overflow plate may have no projections and recesses, and the shape of the projections and recesses can be modified in various ways.

[0036] The receiving plate 16 is a plate-like member extending between both side walls 7c of the intake tank 7. In this embodiment, four receiving plates 16 are provided, and are arranged at a distance from each other from the upstream wall 7a toward the downstream wall 7b. The surface of the receiving plate upper end 16a facing the upstream wall 7a is inclined. The receiving plate upper end 16a is positioned slightly below the screen 9.

[0037] By providing the receiving plate 16, the water that passes through the screen 9 and flows into the water intake tank 7 hits the receiving plate 16, and some of the water flows along the slope of the receiving plate's upper end 16a and overflows again from the back side of the screen 9. In other words, the water that passes through the screen 9 is reflected by the receiving plate 16 and spurts out from the back side of the screen 9, preventing the adhesion of debris such as dead leaves on the surface. In addition, the adhesion of debris due to overflow can be reduced, making it possible to reduce the frequency of cleaning.

[0038] In this embodiment, the number of receiving plates 16 is four, but there is no limit to the number, and the spacing and size of the receiving plates can be changed as appropriate. Also, although the upper ends 16a of the receiving plates are inclined, this is not an essential configuration. [Explanation of symbols]

[0039] 1 Water intake device 3. Bottom of the channel 4. Aspects 7 Water intake tank 7a Upstream wall 7b downstream wall 7c side wall 7d bottom wall 7e aperture 8 Bottom Channel 9 Screens 10. Slide Gate 11 Operating handle 12. Roof

Claims

1. 1. A water intake device having a bottom surface and two side surfaces, a water intake tank located between the two side surfaces, formed by an upstream wall, a downstream wall, one side wall, the other side wall, and a bottom wall, and having an opening facing the bottom wall; A screen covering the opening; A sliding gate that can be moved up and down, A water pipe connecting the water intake tank and a water using facility, When the slide gate is raised, a direct route connecting the upstream and downstream is opened, This water intake device is characterized in that when the slide gate is lowered, the direct route is closed and upstream water flows through a water intake route toward the opening of the water intake tank.

2. The water intake tank has a bottom wall spaced above the bottom surface, one side wall connected to one of the side surfaces, and the other side wall connected to the other side surface, 2. The water intake device according to claim 1, wherein the direct route is formed between the bottom surface and the bottom wall of the water intake tank.

3. The water intake tank has a bottom wall connected to the bottom surface, The slide gate is adjacent to one of the side walls of the intake tank, 2. The water intake device according to claim 1, wherein when the slide gate is raised, the direct route is formed between the bottom surface and the lower end of the slide gate.

4. 2. The water intake device according to claim 1, wherein a roof is provided above the water intake tank to cover the opening.

5. Further, a regulating valve is provided for regulating the amount of water flowing into the water pipe; 2. The water intake device according to claim 1, wherein the regulating valve reduces the amount of water flowing into the water pipe, thereby causing the water in the water intake tank to overflow.

Images