JPS5923777Y2 - Screens for waterways, water intakes, etc. - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to screens for waterways, water intakes, etc.

For example, in a power plant waterway, a screen is provided in the waterway to prevent dust from entering and damage to the generator.

An example of a conventional screen will be explained based on FIGS. 1 to 3. 1 is a plurality of screens (in this example 3) is a screen installed on the support girder 1, and this sufunone 3 has screen pars 4 arranged in large numbers at appropriate small intervals along the transverse direction of the waterway 2. , a ring 5 disposed between each screen par 4 at a location corresponding to each support girder 1, a binding bolt 6 inserted into the through hole of each ring 5 and each screen par 4, and It consists of a nut 7 that is screwed onto each bolt 6 to connect the screeners 4 to each other, and a spacer 8 that is disposed in a direction transverse to the screener 4.

Reference numeral 9 designates a hook bolt that engages with the ring 5 at an appropriate position and is secured to the receiver 1 with a nut 10.

In the above configuration, there is no problem at all when the flow rate of water flowing through the water channel 2 is slow.

However, in recent pumped-storage power plants, the flow speed is faster to generate electricity and pump water.

When the flow velocity is high, the frequency of the excitation force due to the flow (excitation force due to the Karman vortex) approaches or matches the natural frequency of the screen par 4.

In this situation, the screen par 4 resonates,
The vibration caused cracks in the screen par 4,
Eventually, it will become damaged.

In order to prevent the screeners from being damaged, box-shaped supports 12 are installed on both sides of the waterway 2 or on both sides and in the center, as shown in FIGS. Fixed to girder 1, T-shaped rod 13 to each support 12
It has also been considered to increase the strength of the screen 4 by fixing the screen bar 4 through a spacer 8, thereby increasing the natural frequency of the screen bar 4 and preventing it from resonating.

According to the above configuration, resonance of the screener 4 can be prevented, but on the other hand, there is a problem that the area occupied by each support 12 is large and the loss of water head becomes large.

The present invention provides a screen that solves these problems, and its feature is that reinforcing portions of the truss structure are provided at appropriate locations on the screen to reduce water head loss.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 7 to 10.

That is, the screen according to the present invention includes reinforcing parts 20 arranged in parallel at appropriate intervals on both sides or both sides and the center of the waterway 2, connecting rods 21 that connect the upper ends of each of the reinforcing parts 20, and each of the above-mentioned parts. A plurality of screen bars 22 are arranged parallel to each other at appropriate intervals between the reinforcing portions 20 and have their upper ends fixed to the connecting rods 20, and the bars 2 are arranged at appropriate intervals along the longitudinal direction of the screen pars 22.
2, and each spacer 23 extends into each reinforcing portion 20.

Each of the reinforcing parts 20 has a truss structure including a pair of support plates 20 a that are parallel to each other, and an inclined plate 20 b whose upper and lower ends are fixed to each spacer 23 between the surface support plates 203 . be.

Therefore, flowing water flows through the reinforcing section 20, which has a truss structure.
You can freely pass through the interior.

As described above, according to the screen for waterways, water intakes, etc. of the present invention, the strength of the screen is increased because the reinforcing part of one or more truss structures is used, and the natural frequency of the screener is adjusted to the flow of water. The frequency of the vibration is higher than that of the excitation force, and the screener will not resonate.

Therefore, there is no possibility of the screener being damaged by resonance as in the prior art.

In addition, since the reinforcing part has a truss structure, water can freely pass through the reinforcing part, and the area occupied is considerably smaller than that of a screen with conventional box-shaped supports, resulting in less water head loss. This allows effective use of water depth.

Therefore, it is ideal as a screen installed in the headrace of a pumped storage power plant.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional example, with Figure 1 being a front view;
FIG. 2 is an enlarged sectional view of the main part taken along line II--II in FIG. 1, and FIG. 3 is a view taken along arrows II--II in FIG. 4 to 6 show other conventional examples, FIG. 4 is a front view, FIG. 5 is an enlarged sectional view of the main part along the line ■-■ in FIG. 4,
FIG. 6 is a view taken along arrows vI-vIX in FIG. 7 to 11 show an embodiment of the present invention, FIG. 7 is a front view, FIG. 8 is an enlarged front view of main parts, FIG. 9 is a view taken along arrow IX-IX in FIG. Figure 10 is a view taken along the line X-X in Figure 8;
FIG. 11 is an enlarged perspective view of the main part, and FIG. 12 shows an example of the type of truss. 1...Support girder, 2...Waterway, 3...
... Screen, 20 ... Reinforcement part, 20 a.
...Support plate, 20b...Slanted plate, 21.
...Connection rod (connection part), 22 ... Screenper, 23 ... Spacer.

Claims (1)

[Scope of utility model registration request] A reinforcing part of a single truss structure or a plurality of reinforcing parts of a plurality of truss structures arranged in parallel at appropriate intervals, a connecting part that connects the ends of each reinforcing part to each other, and a reinforcing part between the reinforcing parts. It is characterized by comprising a plurality of screeners arranged in parallel at appropriate intervals and whose ends are fixed to the connecting portion, and a plurality of spacers arranged at appropriate intervals along the longitudinal direction of the screeners. Screens for waterways, water intakes, etc.