JP4741971B2 - Intake control device - Google Patents

Description

  The present invention relates to a water intake control device for taking water into hydropower and agricultural waterways, more specifically, various water sources, or use after water intake, stop of water intake, etc. according to environmental conditions, etc. The present invention relates to a double float type water intake control device that interlocks with a water level fluctuation in order to adjust water intake.

Many proposals have been made regarding water intake from rivers. The present applicant has also invented the following patent document 1.
The mountain stream water intake facility of the inflow type hydroelectric power plant is a replenishment facility in case of drought only when the water intake from the main intake located in the dam is below the maximum water intake. For this reason, the equipment operation rate is low and it is difficult to adopt a general water intake control device from the viewpoint of cost effectiveness.
Therefore, in the past, the water intake period was limited to droughts, and the water intake from mountain stream intakes was fixed to ensure compliance with the water usage rules so that the overall water intake would not become excessive.
JP 2000-120047 (floating gate type water intake device)

However, there is a strong demand to improve the profitability of power plants by making effective use of unused energy even in the non-driving period by enabling appropriate water intake according to the shortage of water intake from this intake. .
The water for power generation supplied through the dam intake (main intake) gate is carried to the upstream of the power plant through a substantially horizontal tunnel. The water level of the tunnel is roughly corresponding to the opening of the dam intake (main intake) gate, so the water intake from the dam can be monitored by monitoring the water level of the dam. Therefore, it is possible to monitor the water level of the tunnel and take water from other available mountain streams when the water intake from the dam intake (main intake) gate is less than the maximum intake (so-called water shortage).

On the other hand, when taking water from this water intake, in order to prevent inflow of earth and sand into the tunnel at the time of water discharge, the water intake gate may be closed by setting a water increase limit flow rate. In such cases, the quality of water intake from the mountain stream cannot be expected as well, so it is necessary to limit water intake.
An object of the present invention is to provide a water intake control device that allows water intake other than the main water intake port only when the upper and lower limits of the water level of the tunnel are set and the water level is between them.

  In order to achieve the above object, the water intake control device according to claim 1 of the present invention is a float valve assembly comprising a shaft in which an upper float, an upper water stop valve body, a lower water stop valve body, and a lower float are arranged in this order. And an opening plate that forms a water intake opening between the water intake source and the main channel passage, and the float valve assembly is arranged such that an upper float and an upper water stop valve body are arranged on the upper side of the opening, and a lower water stop valve body on the lower side. And an intake structure in which the lower float is disposed, and the upper float is affected by the water level of the intake water source only when the lower float is affected by the water level of the main channel and the water level of the main channel is between a predetermined fixed water level. The water intake opening may be opened to form a water intake state.

The water intake control device according to claim 2 according to the present invention is the water intake control device according to claim 1, wherein the water discharge channel is a waterway supplying power generation water from a dam intake, and the water intake source is located above the waterway. It can be a water intake source that leads to a mountain stream that flows across.
The water intake control device according to claim 3 according to the present invention is the water intake control device according to claim 1, wherein the upper limit of the constant water level is a water level at which sufficient power generation water is supplied from upstream of the tunnel, and the lower limit is capable of power generation. It can be the limit of water volume or the water level when power generation is not desired.
The water intake control device according to claim 4 of the present invention is the water intake control device according to claim 1, wherein the shaft includes an upper float shaft that regulates an upper limit position of the upper float so as to be slidably supported. be able to.
The water intake control device according to claim 5 according to the present invention is the water intake control device according to claim 1, wherein the upper float and the upper water stop valve body are such that a conical surface below the upper float has an upper water stop valve body. It can be configured integrally to form.

In the present invention, fluctuations in the water level in the headrace can be detected with a floating body to grasp the amount of water intake from the main water intake, and the buoyancy can be used to automatically control the intake opening of the mountain stream intake to enable proper water intake. And In addition, in order to prevent the inflow of sediment into the water channel at the time of flooding, when the water intake is stopped, a function to detect the drop in the water level of the water channel and fully close the intake of the mountain stream is also provided. it can.
Furthermore, since this apparatus performs automatic water intake control without a power source, it can be applied in mountainous areas without a power source.

Embodiments of an apparatus according to the present invention will be described below with reference to the drawings.
FIG. 1 is a front view of an embodiment of a float valve assembly used in a water intake control device according to the present invention, and FIG. 2 is an explanatory view showing an operating state of the water intake control device according to the present invention.
As shown in FIG. 1, the float valve assembly is composed of an upper water stop valve body 1 a, a lower water stop valve body 3 and a lower float 5 which are provided integrally with the upper float 1 and the upper float 1 in this order by the shaft 2. It is connected.
As shown in FIG. 2, this float valve assembly is supported in a vertical cylindrical hole 10a of the water intake structure 10 so as to be able to float up and down, between the water intake source and the main water channel passage (the channel 13).

As shown in FIG. 1, the upper float 1 is a floating body obtained by processing a metal plate such as stainless steel, and the lower conical surface of the upper float 1 forms an upper water stop valve body 1a. The upper water stop valve body and the upper float may be configured separately.
The shaft 2 includes an upper float shaft 2a, a water stop valve adjusting hardware 2b, a main shaft 2c, and a limiting nut 2d.
The upper float shaft 2a supports the upper float 1 so as to be slidable by restricting the upper limit position of the upper float 1 with a limiting nut 2d, and the lower end is coupled to the water stop valve adjusting hardware 2b.
The mounting position of the lower water stop valve 3 with respect to the water stop valve adjustment fitting 2b can be adjusted.
The lower end of the water stop valve adjusting hardware 2 b is coupled to the main shaft 2 c, and the main shaft 2 c is coupled to the lower float 5.

As shown in FIG. 2, the water intake structure 10 between the water intake source and the main water channel passage (the channel 13) receives the float valve assembly, and is provided with a vertical cylindrical hole 10 a communicating with the channel 13. The vertical cylindrical hole 10a is provided with an opening plate 11 having a water intake opening (in this embodiment, a diameter of 180 mm).
The vertical cylindrical hole 10a communicates with the mountain stream channel wall 8 through the horizontal passage 10b.
Although the water level 9 of the mountain stream canal varies slightly, it is generally kept at the water level of the mountain stream.
The float valve assembly is positioned above and below the opening plate 11 so that the bottom water stop valve body 3 is positioned below, and the lower float 5 is fixedly provided in the channel 13. 12 is supported so that it can be moved up and down.

Next, mainly with reference to FIG. 2, the aspect of water intake from the mountain stream to the road 13 will be described. In FIG. 2, water for power generation is supplied to the raft 13 through a water intake gate on the right hand (upstream main water intake dam). The water level (15, 16, and 17 in the figure) of the tunnel 13 is determined by the operation of the water supply gate of the upstream intake dam. In the figure, 13a indicates the ceiling of the tunnel, 13b indicates the bottom, and 19 indicates the direction of water flow.
The mountain stream flows in the direction intersecting (perpendicular to the page) on the road 13 and an intake channel is formed along the mountain stream.
If necessary along the mountain stream, a water intake pond is provided, and the wall surface 8 of the water intake structure 10 faces the water intake source and a horizontal passage 10b is provided.
This embodiment is an example of a specific power plant, and when the water level of the channel 13 is 1471 mm from the bottom 13b of the channel 13, the upper limit water level 16 is taken, and when the water level from the bottom 13b of the channel 13 is 606mm. Water intake lower limit water level 17 is set.

(A) of FIG. 2 has shown the state of the water intake from the mountain stream (mountain stream water level 9) to the ridge 13.
At this time, the water level of the tunnel is between the water intake upper limit water level 16 and the water intake lower limit water level 17.
The upper float 1 is under buoyancy under the influence of the water level 9 of the mountain stream conduit, and the lower float 5 is under the influence of the water level 15 of the channel 13.
As a result, the float valve assembly floats to the position shown in the drawing, and the water intake opening opens, and water is taken from the mountain stream through the opening of the opening plate 11. In the figure, 20 is a streamline indicating the intake flow.

(B) of FIG. 2 shows a state where a sufficient amount of water is supplied from the upstream to the road, and water intake from the mountain stream (water level 9 of the mountain stream) to the road 13 is restricted.
When the water level of the culvert reaches the water intake upper limit water level 16, the lower float 5 rises, and the water stop valve body 3 closes the opening of the opening plate 11 from below to restrict water intake from the mountain stream. Upper float 1 remains at the water level of the mountain stream.

FIG. 2C shows a state where the water level of the road 13 is at the above-described water intake lower limit water level 17 and water intake from the mountain stream is restricted to the road 13.
This water level corresponds to a case where water intake is stopped for power generation stop and a state where water supply is stopped in a state where water supply for power generation such as torrential rain is not preferable.
When the water level in the tunnel 13 is the minimum value, the lower float 5 becomes weighted, the upper float 1 is pulled down, and the bottom of the upper float 1 (upper water stop valve body 1a) closes the water intake hole (opening of the opening plate 11). .

The water intake control device according to the present invention can appropriately take water according to the water intake from the water intake in the non-drought season, and can expect an increase in the amount of generated power. . It can be widely used in the field of power supply by hydroelectric power generation.
Also, civil works for mountain stream intake are not particularly difficult, and there is an advantage that a rational intake structure can be easily formed in relation to the tunnel.

It is a front view of the Example of the float valve assembly used with the water intake control apparatus by this invention. It is explanatory drawing for demonstrating the operation state of the water intake control apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper float 1a Upper water stop valve body 2 Shaft 2a Upper float shaft 2b Water stop valve adjustment fitting 2c Main shaft 2d Restriction nut 3 Bottom water stop valve body 5 Lower float 8 Mountain stream channel surface 9 Mountain stream channel level 10 Intake structure (mountain stream) Water-containing concrete structure for power generation from
10a Vertical cylindrical hole 10b Horizontal passage 11 Opening plate 12 Wave breaker 13 Tunnel 13a Tunnel ceiling 13b Tunnel bottom 15 Intake range water level 16 Intake upper limit water level (1471mm)
17 Lower water intake limit (606mm)

Claims (5)

A float valve assembly comprising a shaft in which an upper float, an upper water stop valve body, a lower water stop valve body and a lower float are arranged in this order;
An opening plate that forms a water intake opening between a water intake source and a main water channel passage, and the float valve assembly includes an upper float on the upper side of the opening and an upper water stop valve body on the lower side; An intake structure for placing the float;
The upper float is affected by the water level of the water intake source and the lower float is affected by the water level of the main water channel, and the water intake opening is opened only when the water level of the main water channel is between the predetermined water levels. Intake control device configured to do.   2. The intake control apparatus according to claim 1, wherein the main channel is a culvert that supplies water for power generation from a dam intake, and the intake is a water intake that is connected to a mountain stream that flows across the tract.   The intake control apparatus according to claim 2, wherein the upper limit of the constant water level is a water level at which sufficient water for power generation is supplied from upstream of the tunnel, and the lower limit is a limit of the amount of water that can be generated or a water level when power generation is not desired.   The intake control device according to claim 1, wherein the shaft includes an upper float shaft that regulates an upper limit position of the upper float and supports the upper float so as to be slidable.   The intake control device according to claim 1, wherein the upper float and the upper water stop valve body are integrally configured such that a lower conical surface of the upper float forms an upper water stop valve body.

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