JPH089857B2 - Automatic backflow prevention gate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drainage channel, a river or the like, which is used to drain water to the sea, a river or the like, and more particularly to a reverse tide prevention gate.

(Prior Art) A conventional sluice gate is provided across a drainage channel and the like, and the door body of the sluice gate is operated upward or downward by human power or power to achieve its purpose.

(Problems to be solved by the invention) The sluice gate has a drainage channel side water level
If the water level of the sea, river, etc., that is, the outside water level becomes low, the water gate is opened to drain water, and if the water level becomes high, the water gate is closed to prevent backflow of seawater, etc. Used to do it efficiently,
In the past, since these operations were performed artificially, manpower was required.Also, in the event of sudden flooding at night, forgetting to close the sluice gate and causing backflow of the tide or outside water, which could lead to fields, houses, etc. You will suffer a flood disaster. In addition, when the size of the sluice gate increases, a power source such as electric power must be prepared.

Therefore, the present invention is designed to detect the upper and lower water levels of the gate by the float in the float chamber and effectively and quickly open or close the gate.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a water channel (1, 2) with a gate (3) slidably up and down, and a float chamber (11) near the water channel. A float (12) is floated in the float chamber, the float chamber communicates with upstream water of the gate, the interior of the float communicates with downstream water of the gate, and the gate moves up and down the float. It is characterized in that it is provided so as to be linked and moved up and down.

(Operation) When the water level on the downstream side of the gate (3) becomes higher than that on the upstream side, water is supplied into the float (12), so the float (12) discharges the water in the float chamber (11). While descending, the gate (3) connected to this descends and closes the gate.

When the water level on the upstream side of the gate (3) becomes higher than that on the downstream side, the water in the float is discharged and the float chamber (1
As the water level in 1) rises, the float (12) rises, so the gate (3) rises and opens the gate.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

A gate 3 is provided so as to be vertically slidable in a groove 1a provided at a boundary between a drainage channel 1 and a gutter pipe 2 that communicates with the sea, a river, or the like. The gate 3 has guide rollers 3a on both side edges, and the guide rollers 3a are engaged with the groove 1a. A shaft 6a is rotatably bridged across the drainage channel 1 between columns 6, 6 that are planted near the gate 3, and a pair of driven sprockets 7, 6 are attached to the shaft 6a.
7 is fixed. A pair of chains 4,4 attached to the upper edge of the gate 3 are wound around sprockets 7,7, and a main counterweight 5 is attached to their free ends.

The still water reservoir 9 provided along the drainage channel 1 is connected to the drainage channel 1 and the upstream side of the gate 3 by the water passage 8. The water passage 8 is formed near the bottom of the drainage channel.

A float chamber 11 defined by an annular wall 10 is provided in the still water reservoir 9, and a float 12 is floated in the float chamber 11. The distance between the float chamber 11 and the float 12 is made as small as possible. The float chamber 11 and the still water reservoir 9 are communicated with each other by a small diameter water pipe 10a attached to an annular wall 10 near the bottom of the float chamber 11, but the water pipe 10a is bent upward. The upper edge opens at substantially the same water level as the water passage 8.

The float 12 is hollow as shown in FIG.
One end of a water conduit 13 is connected to the bottom thereof, and the other end is provided so as to penetrate the annular wall 10 and open near the bottom of the gutter pipe 2. An air vent valve 14 is attached to the top of the float 12, and a weight 12a is attached to the bottom.The weight of the weight is such that the float does not float even when maximum buoyancy acts on the float. I am sorry.

A pair of stanchions 16,16,17,17 are erected on the side wall of the still water basin 9, and shafts 16a and 17a are rotatably bridged between the stanchions, and sprockets are mounted on the respective shafts. 18,19 are fixed. The shaft 6a and the shaft 16a are linked so as to rotate simultaneously.

One end of a driving chain 15 is fixedly mounted on the top of the float 12, an auxiliary counterweight 20 is suspended at the other end, and sprockets 18 and 19 are wound in the middle of the driving chain 15.

The weight of the gate 3 is large enough to close the door by its own weight, and the weights of the main counterweight 5 and the auxiliary counterweight 20 are such that the water level in the float 12 is higher than that in the float chamber 11. It is set so that it balances with the float 12 at a low level to some extent and stands still, and the water level difference considers the density and buoyancy of seawater and seawater when the downstream of the gutter pipe 2 is the sea. In the case where the seawater is made large enough to prevent backflow and the downstream of the gutter pipe 2 is a river, the water level difference is made as small as possible, but the water level difference is never eliminated.

 Next, the operation will be described.

Since the float 12 does not completely eliminate the water level difference between the inside and outside of the float, the float 12 works to lower the float 12 and close the gate 3 before the backflow occurs. As the float 12 descends, water is supplied into the float 12 through the water conduit 13 and the water in the float chamber 10 is discharged through the water pipe 11. Therefore, the float 12 moves up and down the gate 3. The water level difference becomes large, and the closing motion is continued until the water level difference reaches a predetermined value.

At that time, the resistance at the start of the exercise is a static friction resistance, which is sufficiently large, but the resistance after starting to take a motion becomes a dynamic friction resistance and becomes significantly small. Therefore, the gate 3 may move largely, but the float 12 side Since the gap on the other side is made as small as possible, if the float 12 descends sharply, the water level in the float chamber rises significantly and the operating force is drastically reduced, so that the gate 3 is prevented from moving abruptly. If the water level upstream of the gate 3 becomes larger than that downstream, the float 12 will rise and the gate 3 will open, of course, but it will cause a flood and the water level inside the gate, that is, the drainage channel 1 side will rise and the gutter pipe. When 2 becomes full, the pressure head in the gutter pipe 2 becomes lower than the water level in the drainage channel 1 by the velocity head, so that the gate 3 is fully opened and there is no obstacle to drainage. Further, when the downstream water level suddenly becomes extremely high while the gate is closed, the air vent valve is closed to prevent the ingress of seawater or the like.

(Effect) Since the present invention is configured as described above, the gate can be reliably closed by the water level downstream of the gate, and when the water level upstream of the gate becomes the water level difference required for drainage, the gate is immediately opened. It opens and drains, so no human labor is required.
Since it is extremely convenient and structurally not complicated, the construction cost is extremely low.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is taken along line III-III of FIG. FIG. 1 ... drainage, 2 ... gutter pipe, 3 ... gate, 5 ... counterweight, 9 ... still water reservoir, 11 ... float chamber, 12 ...
Float, 13 ... Water conduit.

Claims (1)

[Claims] 1. A gate is provided in a water channel so as to be vertically slidable, a float chamber is provided in the vicinity of the water channel, a float is floated in the float chamber, and the float chamber communicates with upstream water of the gate. Inside communicates with the water downstream of the gate,
Moreover, the automatic reverse flow prevention gate is characterized in that the gate is provided so as to be vertically moved in association with the vertical movement of the float.