JPS5910176Y2 - Jet flow gate energy reduction device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an energy reducing device that reduces the energy of a high-speed flow ejected when a jet flow gate is opened.

Conventionally, this type of energy reducing device uses a high-speed flow jetted from a gate orifice C into a pipe on the downstream side of a jet flow gate b provided to adjust the flow rate of a discharge pipe a, as shown in Fig. 4. There is a system in which a baffle plate d having a number of holes e for reducing the force of the flow is arranged in a forward-inclined position, and the high-speed flow is caused to flow downstream after the force of the high-speed flow is reduced by the baffle plate d.

However, in the above-mentioned conventional energy reducing device, the arrangement of the baffle plate d requires a lot of effort, and the structure of the baffle plate d having multiple holes makes maintenance management very difficult.

The purpose of this invention is to obtain a sufficient energy reduction effect with a simple structure, by forming a rim on the downstream side of the gate orifice of the spillway, and connecting the gate orifice to the bottom of the rim. A plurality of buttful piers are installed at predetermined intervals in the direction perpendicular to the direction of the high-speed flow so as to be hit by the ejecting high-speed flow, and the upper part of the weir is installed on the downstream side of the buttful pier so as to form a deflection pocket. It is characterized by integrally providing a deflector projecting toward the upstream side.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an example of a dam spillway employing the energy reducing device of the present invention, and FIGS. 2 and 3 show the energy reducing device of the present invention. A weir 4 is provided on the downstream side of the jet flow gate 2 provided in the middle of the jet flow gate 1, that is, on the downstream side of the gate orifice 3, and a weir 4 is provided at a predetermined distance downstream from the gate orifice 3 to form a pool 5. In order to make the bottom of the abyss 5 a little lower than the gate orifice 3 and make it a horizontal bottom, the high-speed flow 8 ejected from the gate orifice 3 collides with the ice flat bottom downstream of the gate orifice 3. As shown in FIG. 3, a plurality of vertical piers 6 are arranged and fixed at a predetermined interval in parallel in the width direction, and the upper part of the front surface of the weir 4 is made to protrude upstream to deflect the vertical piers 6 to the downstream side. A deflector 7 forming a pocket is formed, and a gate orifice 3 is formed.
The high-speed flow 8 ejected from the pier is deenergized by hitting the double pier 6, and the high-speed flow passing between the double pier 6 is deflected by the deflector 7.
Even the deflection pocket due to the deflection is caused to be deflected and the energy is reduced.

With the above structure, when the jet flow gate 2 is opened, the high-speed flow 8 ejected from the gate orifice 3 is discharged into the water in the pool 5, and a part of the high-speed flow 8 hits the buffer pier 6 and flows upward. It is turned into a current and rotated in the water as shown by the arrow in Figure 2.

Further, the other part of the high-speed flow 8 that has passed between the double piers 6 is changed into a downward flow as shown by the arrow in the deflector pocket by the deflector 7, and is rotated underwater.

As a result, the high-speed flow 8 discharged from the gate orifice 3 into the water of the pool 5 is effectively attenuated and sequentially flows out over the discharge channel or weir 4.

In the present invention, as described above, the combination of the baffle pier 6 and the deflector 7 rotates the high-speed flow in the water, causing it to stagnate in the pool 5 and then flowing out, so it has a force-reducing effect compared to the conventional method using a baffle plate. Therefore, the length of the energy reducing device can be shortened and construction costs can be reduced, and the strength can be further improved and maintenance management can be facilitated.

As described above, according to the energy reducing device of the present invention, the energy reducing effect can be enhanced compared to other methods with the simple and high-strength structure of a combination of a buffer pier and a deflector. By shortening the length dimension, excellent effects such as reduction in construction costs can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing an example of a dam spillway employing the energy reducing device of the present invention, FIG. 2 is a schematic side view of the energy reducing device of the present invention, and FIG. 3 is a cutaway plan view of FIG. 2. FIG. 4 is a schematic side view of a conventional energy reducing device. 1...Discharge pipe, 2...Jet flow gate, 3...Gate orifice, 6...
...Batsuful Pier, 7...Teflector.

Claims (1)

[Scope of utility model registration request] An abyss is formed on the downstream side of the gate orifice of the spillway, and a plurality of buttful piers are formed at a predetermined interval in a direction perpendicular to the direction of the high-speed flow so that the high-speed flow ejected from the gate orifice hits the bottom of the abyss. What is claimed is: 1. An energy reducing device for a jet flow gate, characterized in that a deflector is integrally installed on the downstream side of the baffle pier and projects from the upper part of the weir toward the upstream side so as to form a deflection pocket.