JP2568887Y2 - Intake tank - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake tank for a power plant or the like which prevents fluctuations in water level.

[0002]

2. Description of the Related Art Conventionally, an intake tank provided with a plurality of pumps has been planned as a completely separated independent waterway or a waterway having a sufficiently large common space. As the number of watercourses is increased, small common spaces are locally divided by diversion walls. That is, as shown in FIG.
The suction water tank 2 whose flow path gradually expands toward the downstream is installed. The suction water tank 2 is divided by the number of installed pumps (four in this example) by the dividing walls 3 and 3a. The central dividing wall 3 is arranged so as to divide the suction water tank 2 into two, and furthermore, the dividing wall 3a so as to divide the divided flow path into two.
Is arranged. The dividing wall 3a is arranged to be inclined toward the inside of the flow path on the upstream side so as to equally divide the amount of water from the upstream. A pump 4 is provided downstream of each of the flow paths thus partitioned. Arrows in FIG. 4 indicate the flow of water.

[0003]

In the conventional water intake tank shown in FIG. 4, as shown by the arrow in FIG. 5, a so-called oscillation phenomenon occurs in which the flow flows to the left or to the right. May cause. This oscillation phenomenon occurs as shown in FIG. 5 by the central dividing wall 3 and also at the tip of the dividing wall 3a that divides into two. As a result, the water level in each of the divided flow paths fluctuates greatly, and the duration thereof is long. In the worst case, there occurs a problem that the suction port of the pump is exposed and air is sucked.

[0004] The present invention aims to provide an intake tank capable of solving the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a suction water tank connected to a headrace and divided into a plurality of flow paths, and an intake tank provided with a pump provided in each of the flow paths. A plate-like resistor is provided substantially below the water surface at a substantially leading end of the flow path and is provided so as to be substantially orthogonal to the flow or inclined to the downstream side.

[0006]

According to the present invention, the flow of water flowing into the front end of the flow path defined by the suction water tank is changed by a resistor to a direction where there is no obstacle, and the flow of the portion without the resistor goes straight.
Therefore, the flow rate of water flowing into each flow path can be made equal by appropriately selecting the shape and size of the resistor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. A suction water tank 2 whose flow path gradually expands downstream is connected to the downstream end of the water guide channel 1. The suction tank 2 is divided by the number of pumps (four in this embodiment) provided on the downstream side thereof by the dividing walls 3 and 3a. That is, a central dividing wall 3 is arranged so as to bisect the flow path in the suction water tank 2 to the left and right, and a dividing wall 3a is further arranged to bisect the bisected flow path.

[0008] The suction water tank 2 at the end of the central dividing wall 3
At the bottom, a rectangular dive weir 5 as a resistor is erected. The submergence weir 5 is provided on both sides of the diversion wall 3 so as to be orthogonal to the flow and extends halfway in the flow path divided into two by the diversion wall 3, and its height is below the water surface. Is set as in It is desirable that the width of the dive weir 5 is 1 to 1.5 times the width of the upstream headrace, and the height is 0.4 to 0.5 times the height or depth of the upstream headrace.

In this embodiment, since the above-described structure is provided, as shown by an arrow in FIG.
The water flow that has flowed into the suction water tank 2 at the tip of the central dividing wall 3
A part of the flow direction is changed by the dive weir 5 installed at the bottom of the part, and a part is passed straight through. Thereby, the occurrence of left and right oscillation phenomena due to the distal end of the flow dividing wall 3 is suppressed, and water is distributed to the respective pumps 4 in equal amounts to prevent fluctuations in the water level.

In the first embodiment, the dive weir 5 is provided at the front end of the central dividing wall 3, but in addition to this,
A similar dive weir 5 can be provided at the tip of the dividing wall 3a.

A second embodiment of the present invention will be described with reference to FIG. In the present embodiment, a suction water tank 2 is provided in the middle of the water channel 1 obliquely toward the downstream of the water channel 1, and defines four flow passages having substantially the same cross-sectional area in the suction water tank 2. Three flow dividing walls 3 are arranged, and a pump 4 is provided downstream of each flow path.
Is erected. At the bottom of the suction water tank 2 at the distal end of each of the flow dividing walls 3, as in the first embodiment, provided in contact with the flow dividing wall 3 and on both sides thereof at right angles to the flow and extending halfway through the flow path. A descent weir 5 as a resistor below the water surface is provided upright.

In each of the flow paths of the suction water tank 2 of the present embodiment, a straight flow and a flow deviating left and right sometimes occur. However, this flow is suppressed by the dive weir 5 and an equal amount of water flows into each flow path. Can be distributed to prevent fluctuations in the water level.
In addition, this can greatly reduce the size of the water channel.

In the first and second embodiments, the dive weir 5 is provided so as to be orthogonal to the flow.
As shown in FIG. 5, the dive weir 5 may be provided on both sides of the flow dividing wall 3 so as to be inclined toward the downstream side of the flow.

[0014]

According to the present invention, the flow rate of each flow path is improved by the plate-shaped resistor provided substantially below the water surface at the end of the plurality of flow paths defined in the suction water tank, and the water level fluctuation is reduced. Can be prevented, and the size of the water channel can be greatly reduced.

[Brief description of the drawings]

1 shows a first embodiment of the present invention, wherein FIG. 1 (a) is a plan view thereof, and FIG. 1 (b) is a sectional view taken along the line AA of FIG. 1 (a).

FIG. 2 shows a second embodiment of the present invention, wherein FIG. 2 (a) is a plan view thereof, and FIG. 2 (b) is a sectional view taken along the line BB of FIG. 2 (a).

FIG. 3 is a plan view showing another dive weir used in the first and second embodiments of the present invention.

FIG. 4 is a plan view of a conventional water intake tank.

FIG. 5 is an explanatory view of a flow oscillation phenomenon in the conventional water intake tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Headrace channel 2 Suction water tank 3, 3a Dividing wall 4 Pump 5 Dive weir

Claims (1)

(57) [Scope of request for utility model registration] 1. A suction water tank connected to a headrace channel and divided into a plurality of flow paths, and a water intake tank provided with a pump provided in each of the flow paths, wherein a substantially distal end of the divided flow path is provided. An intake tank characterized in that a plate-like resistor is provided under the water surface so as to be substantially orthogonal to the flow or inclined to the downstream side.