JPH0410273Y2 - - Google Patents

Description

[Detailed explanation of the invention] There are many weirs, doors, water gates, etc. that open and close automatically, but most of these are done using other power sources (manual, electric, etc.), so it is difficult to understand the true physics. There are very few automatic methods that do it in a traditional way.
In particular, there are almost no automatic opening/closing weirs for waterways used for irrigation of rice paddies and farmlands.

The purpose of the "automatic opening/closing weir" of this invention is to automatically control the water level adjustment of the above-mentioned irrigation canals for rice fields and fields.

That is, at an appropriate location of the concrete waterway 1,
A weir plate 2 is installed perpendicularly and perpendicularly to the waterway, and side plates 3 of the same shape are welded to both downstream sides of the weir plate 2, and side plates 3 of the same shape are attached to the upper side of the weir plate 2 for rotation and reinforcement purposes. The rotating shaft 4 is welded to the concrete waterway 1.
Bearings 5 that hold the rotating shaft 4 are attached to both walls of the weir plate 2, and the weir plate 2 is held at a position where the lower side touches the bottom of the concrete waterway 1. Also, on the upstream side of the weir plate 2, a stop bar 6 for vertically holding the weir plate 2 is installed on the concrete waterway 1.
It is installed on both walls of the dam to prevent the weir plate 2 from protruding to the upstream side.

On the downstream side of the weir plate 2, there are two pedestals 7 of the same shape for holding a heavy balancing object (hereinafter referred to as BW) 8.
Attach it to the upper side of the side plate 3 of the sheet. This pedestal 7 has an angle of about 85-87 degrees with respect to the weir plate 2, and when the cylindrical BW 8 is placed across the two pedestals 7, the BW 8 will follow the slope of the pedestal 7. Therefore, it rotates and settles at the end (downstream side) of the pedestal 7.

Then, the weir plate 2 will be strongly pressed against the stop bar 6 on the upstream side by the weight of the BW8, completely blocking the water flowing from upstream, and storing water 9 on the upstream side of the weir plate 2.

This water storage 9 makes it possible to effectively supply water to the rice fields and farmland located on both sides of the concrete waterway 1.

The height _H1 of the weir plate 2 is usually about 2/3 of the inner height H of the concrete waterway 1, and the water pressure P at this time is
The balance with BW8 is maintained and a certain amount of water 9 can continue to be stored on the upstream side of the weir plate 2, but in the unlikely event that there is localized rainfall on the upstream side, the water will suddenly increase.
If _H2 etc. occurs, it will be a dangerous situation, so
The balance between the water pressure P and BW8 is disrupted, the lower side of the weir plate 2 opens toward the downstream side, and the stored water 9 temporarily flows downstream, and at the same time, the BW8 that was stopped at the end of the cradle 7 is removed from the weir. As it rotates and changes its position towards the plate 2, the balance between the water pressure P and BW8 is further disrupted, and the water stored on the upstream side rapidly flows out to the downstream side.
When the dangerous water increase _H2 on the upstream side is resolved and there is no water on the upstream side of the weir plate 2, the weir plate 2 returns to its original position, and the BW8 rotates downstream on the pedestal 7 again and settles. However, water storage 9 starts again on the upstream side of weir plate 2.

Normally, there is an opening about 1/3H in the upper part of the weir plate 2, so excess water will overflow the upper part of the weir plate 2, so the necessary amount of water will always be kept. You can save.

In addition, this "automatic opening/closing weir" can be removed from the holder 5 and stored when the water storage 9 is no longer needed, so it is very convenient and economical, contributing to labor savings for farmers. I think there is a lot to be done.

[Brief explanation of the drawing]

Figure 1 is a sectional view of normal storage water, Figure 2 is a view taken in the direction of the arrow in Figure 1, Figure 3 is a sectional view of abnormal water level, Figure 4 is a view taken in the direction of the arrow in Figure 3, and Figure 5. is a plan view of Fig. 1, and Fig. 6 is an end view, front view, and sectional view of BW. 1 is a concrete waterway, 2 is a weir plate, 3 is a side plate, 4 is a rotating shaft, 5 is a holder, 6 is a stopper, 7 is a cradle, 8 is a BW, 9 is a water storage on the upstream side, H is a waterway The internal height, H ₁ is the vertical height of the weir plate, H ₂ is the height of the overwater level, and P is the water pressure.

Claims (1)

[Scope of utility model registration request] Concrete waterway 1 for irrigation of rice fields and farmlands
A weir plate 2 for the purpose of water level adjustment is installed on the weir plate 2, and a platform 7 on which a balanced weight object (hereinafter referred to as BW) 8 can be moved is attached to the upper side of the downstream side of the weir plate 2. The water pressure P on the upstream side of BW8 is made equal to the balance of BW8, and if an unexpected increase in water occurs on the upstream side due to rain etc. and a danger occurs, BW8 will rotate close to the weir plate 2 and close it. When the increased water on the upstream side of the weir plate 2 is discharged to the downstream side and the dangerous situation is overcome, and the water storage 9 on the upstream side is exhausted, the BW 8 rotates on its axis again on the platform 7 and settles on the downstream side. Water is stored 9 again on the upstream side of the weir plate 2. The structure of the automatic opening and closing weir allows this work to be repeated automatically.