JP3547666B2 - Receiving tank structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates mainly to a water receiving tank structure for supplying a fixed amount of water using a water receiving tank in a water diversion work for agricultural water.
[0002]
[Prior art]
In the diversion of agricultural water, quantitative water supply using a water receiving tank has been widely performed, and an example of the water supply is shown in FIG. 3, in which the water is supplied from a reservoir (tank) 1 to a water receiving tank 3 via a water distribution pipe 2. Water flows by natural fall (water head), the flow rate of which is adjusted by a water supply valve (float valve) 5 with a float 4, and water is supplied to a water channel 7 via a movable dam 6.
[0003]
In this water receiving tank structure, the dam 6a of the movable dam 6 is raised and lowered to adjust the overflow height H to supply a constant amount of water.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional water receiving tank structure, when the supply water flow rate is increased, the overflow height H is increased by lowering the weir plate 6a. W also decreases, and the overflow surface a also decreases because the water surface of the water receiving tank 3 and the overflow surface a are the same. Conversely, when decreasing the feed water flow rate, the overflow height H is lowered by raising the weir plate 6a. The water level W rises and the overflow surface a rises.
[0005]
As described above, in this water receiving tank structure, the water level W (the height of the float 4) of the water receiving tank 3 rises and falls as the weir plate 6a moves up and down, and the overflow surface a also rises and falls. Therefore, it takes time until the required overflow height H is reached (until the water level W of the water receiving tank 3 is stabilized), and the vertical stroke of the weir 6a is long.
[0006]
It is an object of the present invention to make it possible to smoothly adjust a fixed amount of water under the above circumstances.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention separates the water surface of the water receiving tank from the overflow surface of the cough. If the water surface and the overflow surface are not the same, the influence of the water level fluctuation of the receiving tank at the time of adjusting the crest overflow height will be reduced, and the operation of the flow rate adjusting means for adjusting the overflow height of the cough will be smooth. It can be done in a short time.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
As an embodiment of the present invention, water is introduced by natural fall, and in the above-described water receiving tank in which the inflow water level is adjusted by a float type water level adjusting valve, a weir tank is provided in the water receiving tank, and lower portions of both tanks are provided. Along with the communication, a flow control door was provided in the communication passage, so that the water in the water receiving tank flowed into the weir tank through the communication passage, and overflowed the weir of the weir tank and flowed out of the water passage. A configuration may be employed.
[0009]
According to this configuration, the amount of water flowing into the weir tank is adjusted according to the degree of opening and closing of the communication passage of the water control door, and based on the amount of water, the overflow amount (overflow height) of the weir is determined to supply a fixed amount of water. be able to.
[0010]
【Example】
FIG. 1 and FIG. 2 show an embodiment. In this embodiment as well, water flows from a reservoir 1 to a water receiving tank 3 via a water distribution pipe 2 by natural fall. The water level (flow rate) is adjusted by a water level control valve 5 whose opening degree is adjusted. In the figure, reference numeral 8 denotes a water stop valve.
[0011]
The water receiving tank 3 is provided with a weir tank 10. The water receiving tank 3 and the weir tank 10 communicate with each other through a communication passage (hole) 11 at a lower portion thereof, and water flows from the water receiving tank 3 to the weir tank 10. Water is supplied to the water channel 7 after overflowing from a weir 12. The communication passage 11 is provided with a water control door 13, and the water control door 13 moves up and down via the screw shaft 15 by the rotation of the handle 14. By this elevation, the flow area of the communication passage 11 is adjusted, the inflow amount into the weir tank 10 is adjusted, and the overflow height H, that is, the water supply amount is adjusted. In the figure, reference numeral 16 denotes a scale plate, and reference numeral 17 denotes a side wall protruding forward of the weir tank 10. The side wall 17 regulates the overflow to the side.
[0012]
At the time of water supply adjustment by the water control door 13, the water level W of the water receiving tank 3 is vertically displaced from the solid line to the chain line or from the chain line to the solid line by raising and lowering the water control door 13. This does not affect the flow area of the communication path 11 due to the displacement, but only affects the flow rate of the water head displacement due to the displacement. That is, the overflow height H (water supply amount) from the weir 12 is not directly affected by the change in the water level W as in the conventional case shown in FIG. 3, the adjustment stroke of the water control door 13 is short, and the adjustment is smooth. is there.
[0013]
【The invention's effect】
According to the present invention, since the water level of the water receiving tank and the overflow surface of the weir are separated as described above, the water supply amount can be adjusted smoothly.
[Brief description of the drawings]
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of one embodiment. FIG. 2 (a) is an enlarged schematic view of a main part of the embodiment, FIG. , (B) is a schematic diagram of the right side of the same.
DESCRIPTION OF SYMBOLS 1 Reservoir 2 Water distribution pipe 3 Water receiving tank 4 Float 5 Water level adjustment valve 7 Waterway 10 Cough tank 11 Communication passage 12 Weir 13 Water control door 14 Handle 15 Screw shaft

Claims (1)

In the water receiving tank 3 in which water flows in by natural fall and the inflow water level is adjusted by the float type water level adjusting valve 5,
A dam tank 10 is provided in the water receiving tank 3 and a lower part of both tanks 3 and 10 communicates with each other. A water control door 13 for adjusting the flow rate is provided in a communication passage 11. A water receiving tank structure characterized by flowing into a weir tank (10) through a weir (11), flowing over a weir (12) of the weir tank (10), and flowing out to a water channel (7).

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