JP2001112360A - Siphon-type water-intake apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a siphon-type water-intake apparatus enabling air which has flowed in a pipe forming a siphon to reliably be removed from the inside of the pipe and capable of sustaining a stable water-intake situation. SOLUTION: A bubble capture chamber 11 for catching bubbles contained in water flowing in a siphon pipe 4, an auxiliary siphon pipe 12 of a small diameter which branches from the siphon pipe 4 and a bubble-discharging pipe 14 of a small diameter which joins the upper part of the bubble capture chamber 11 to the auxialiary siphon pipe 12 and discharges air in the bubble capture chamber 11 into the auxiliary siphon pipe 12 are joined to the peak of the siphon pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a siphon-type water intake device, and more particularly, to a siphon-type water intake device for supplying water from a reservoir or the like as irrigation water for paddy fields.

[0002]

2. Description of the Related Art Most of the conventional irrigation methods for paddy fields are based on open channels, and the intake from reservoirs (reservoirs) is often performed by means of slopes. On the other hand, in recent years, irrigation methods using pipelines have been adopted for effective use of water and labor saving in water management.However, when water is taken from conventional slopes to pipelines, water hammer and air hammer are generated. To destroy pipelines,
There is a problem that invalid release occurs.

For this reason, it is conceivable to penetrate a new pipe into the embankment of the reservoir or to lay the pipe in a conventional bottom gutter provided at the bottom of the embankment. Need. Although the method of laying a pipe in the bottom gutter is less expensive than the former, the original function of the bottom gutter is impaired, and there is a problem related to the life of the reservoir itself. In practice, it would not be feasible to implement these methods except during major rehabilitation of the reservoir.

[0004]

A method of arranging a siphon pipe on the embankment and taking water with a siphon is conceivable. However, in this siphon method, since the inside of the siphon pipe is in a reduced pressure state, it is dissolved in water. There is a lot of operational problems such as the siphon not functioning due to the air being separated as bubbles and the accumulation of air at the highest point of the siphon tube.

Accordingly, the present invention can reliably remove air in a pipe forming a siphon from the pipe.
It is an object of the present invention to provide a siphon-type water intake device that can maintain a stable water intake state.

[0006]

In order to achieve the above-mentioned object, a siphon-type water intake device according to the present invention is a siphon-type water intake device which takes in water from a reservoir or the like by a siphon pipe and supplies it as irrigation water or the like. A bubble trap chamber for trapping bubbles in the siphon tube, a small-diameter auxiliary siphon tube branched from the siphon tube, and an upper part of the bubble trap chamber and an auxiliary siphon tube connected to assist air in the bubble trap chamber. And a small-diameter bubble discharge pipe for discharging to a siphon pipe.

Further, the siphon-type water intake device of the present invention is a siphon-type water intake device for taking in water from a reservoir or the like with a siphon pipe and supplying it as irrigation water or the like, wherein bubbles for trapping air bubbles in the siphon pipe are provided. A trapping chamber, a small-diameter auxiliary siphon tube connected to the lower part of the bubble trap chamber, and a small-diameter bubble discharge pipe connecting the upper part of the bubble trap chamber and the auxiliary siphon tube, and the auxiliary siphon tube is: A venturi or an orifice for sucking air in the bubble discharge pipe into the auxiliary siphon pipe is further provided, and the bubble trap chamber is further provided with a screen installed therein, and a bubble inflow chamber communicated with the siphon pipe. When,
The auxiliary siphon tube and the bubble discharge chamber communicated with the bubble discharge tube are partitioned into each other, and the bubble discharge tube is
The air suction portion at the tip is a flexible tube supported by a float.

[0008]

1 and 2 show an embodiment of a siphon-type water intake apparatus according to the present invention. FIG. 1 is an explanatory view showing the entire structure, and FIG. 2 is a sectional view of a main part. . This siphon-type water intake device is for taking water from a reservoir 1 and supplying it to an irrigation pipeline 2. A siphon pipe 4 composed of a pipeline constituting a siphon is arranged on a bank 3. I have. A flexible pipe 7 connected to a water intake float 6 via a shutoff valve 5 such as a check valve, a one-way valve, a gate valve is provided on a reservoir side 4a of the siphon pipe 4, and a pipeline side 4b is shut off. Pipeline 2 via valve 8
Connected to A water injection valve 9 and an exhaust valve 10 are provided at the highest point 4c of the siphon pipe 4. Although not shown, the water supply valve 9 is provided with a water supply pipe connected to the reservoir 1 via a pump or the like.

At the highest point 4c of the siphon tube 4, air bubbles are trapped for trapping air (bubbles) generated or flowing into the siphon tube 4 and rising to the highest point 4c of the siphon tube 4. A chamber 11 and an auxiliary siphon tube 12 are provided. The bubble capturing chamber 11 is provided with a bubble rising tube 13 at the lower part.
Is connected to the siphon tube 4 through the
A small-diameter air discharge pipe 14 connected to the auxiliary siphon pipe 12 is provided in the upper part of the air filter.

[0010] The auxiliary siphon tube 12 is a siphon tube 4
And a branch valve near the highest point 4c of the siphon pipe 4 and a shut-off valve 1 attached to an auxiliary pipeline 2a provided substantially at the same point as the pipeline 2.
5. This auxiliary siphon tube 12
By the same siphon action as the siphon tube 4, the siphon tube 4
A part of the water in the inside is branched and made to flow down to the auxiliary pipeline 2a.
The air trapped inside is sucked.

The diameter of the auxiliary siphon pipe 12 is appropriately selected according to conditions such as the height difference between the water surface of the reservoir 1 and the auxiliary pipeline 2a and the amount of air to be eliminated. When a small-diameter pipe of about 10 mm is used, the flow of water in the pipe becomes faster, and small air bubbles intermittently sucked and discharged from the air bubble capturing chamber 11 gather due to surface tension to form a large air mass. This air can be reliably discharged together with the water flowing through the auxiliary siphon tube 12.

The water intake float 6 is for taking in surface water having a relatively high temperature, and moves up and down when the flexible pipe 7 bends as the water level changes. Further, the water intake section of the water intake float 6 is formed so as not to inhale air at the time of water intake.

Next, a procedure for supplying water from the reservoir 1 to the pipeline 2 by the siphon-type water intake device will be described. First, with both shutoff valves 5 and 8 of the siphon pipe 4 closed, water is injected into the siphon pipe 4 from the water injection valve 9 using a pump or the like, and air in the siphon pipe 4 is discharged from the exhaust valve 10. Discharge. Thereby, the air in the siphon pipe 4 is discharged to the outside through the exhaust valve 10, and the water level in the siphon pipe 4 gradually rises to fill the pipe.

When the water level becomes higher than the highest point of the auxiliary siphon pipe 12, water flows into the bubble trap chamber 11 and the auxiliary siphon pipe 12, and passes through the shut-off valve 15 which has been opened beforehand, and the auxiliary pipe. The state is such that water flows out to the line 2a. At this time, when the water injection valve 9 and the exhaust valve 10 are closed and the shutoff valve 5 on the reservoir side is gradually opened, a siphon action occurs in the auxiliary siphon pipe 12 and the intake float 6
The water in the basin 1 that has been drawn in at the reservoir 4
a through the auxiliary siphon pipe 12 to the auxiliary pipeline 2a
It is in a state of flowing. Finally, when the shut-off valve 8 on the pipeline 2 side is opened, the siphon action of the siphon pipe 4 causes the water in the reservoir 1 to be supplied to the pipeline 2 through the siphon pipe 4 to be in a water intake operation state.

In a normal state, most of the water taken in by the intake float 6 flows through the siphon pipe 4 and passes through the pipeline 2
And a part of the water branches into the auxiliary siphon pipe 12 and flows into the auxiliary pipeline 2a.

In this water intake operation, since the inside of the siphon pipe 4 is in a reduced pressure state, the air dissolved in the water is separated as bubbles. If the flow rate in the siphon tube 4 is high to some extent, the bubbles generated in the tube
Flows down to the pipeline 2 together with the water flowing down, but when the flow velocity is slowed down to a certain level or less, the bubbles rise along the upper wall of the siphon tube 4 and rise to the highest point 4c of the siphon tube 4. Bubble riser 13 provided
From the air bubble capturing chamber 11 to be captured.

On the other hand, the auxiliary siphon tube 12 uses a small-diameter pipe so that the flow rate of water flowing through the auxiliary siphon tube 12 is sufficiently high. Is captured by the air pipe 14 and flows into the auxiliary siphon pipe 12 from the air discharge pipe 14, and the auxiliary pipeline 2 a
And water and bubbles are separated at the end of the auxiliary pipeline 2a. The water flowing into the auxiliary pipeline 2a is:
The water may be directly discharged to rivers or the like, or supplied to paddy fields as part of irrigation water. Further, the auxiliary siphon pipe 12 may be discharged to an appropriate position from the end without providing the auxiliary pipeline.

As described above, while the water intake operation is continued, the air bubbles are trapped in the bubble trapping chamber 11 at the highest point 4c of the siphon tube 4, and the bubbles are trapped and removed by the water flowing through the auxiliary siphon tube 12. Accordingly, it is possible to prevent the occurrence of air accumulation in the siphon tube 4 beforehand, and to continue the water intake operation in a stable state. Moreover, by forming the volume of the bubble capturing chamber 11 to be relatively large, it is possible to stably remove bubbles even when a large amount of air flows in temporarily.

For example, when the water intake amount is reduced or the water intake operation is stopped, if the shutoff valve 8 is squeezed or closed, the flow velocity on the pipeline side 4b of the siphon pipe 4 is reduced, and the flow rate in the siphon pipe 4 is reduced. If the amount of the air bubbles rises at a stretch, if the amount is large, air will accumulate over the entire highest point 4c of the siphon tube 4, water will not flow into the auxiliary siphon tube 12, and the siphon effect will be lost. Sometimes.
Even in such a case, if the volume of the bubble trap chamber 11 is made sufficiently large, all or most of the raised bubbles flow into the bubble trap chamber 11 and the siphon action of the auxiliary siphon tube 12 is continued. As a result, the air bubbles in the air bubble capturing chamber 11 can be gradually discharged by the siphon action of the auxiliary siphon tube 12.

Further, the air discharge pipe 14 connecting the bubble trap chamber 11 and the auxiliary siphon pipe 12 is formed in an inverted U-shape as shown in FIG. Since the air in the bubble trapping chamber 11 can be prevented from flowing into the auxiliary siphon tube 12 at a stretch, a large amount of air does not flow into the auxiliary siphon tube 12 and the siphon action is not lost. By adjusting the amount of air in the auxiliary siphon tube 12 to 30% or less of the total flow rate, it is possible to more reliably prevent the siphon action from being invalidated. Further, the air discharge pipe 14 may be provided with a valve for adjusting the displacement.

Further, a branch portion of the auxiliary siphon tube 12 from the siphon tube 4 is not provided on the upper surface of the highest point 4c of the siphon tube 4, but the side (reference numeral 12a in FIG. 2) or the lower surface of the siphon tube 4 at the highest point 4c. Or in the upper part of the reservoir side 4a, it is possible to prevent air bubbles flowing in the siphon tube 4 from flowing into the auxiliary siphon tube 12, thereby also ensuring that the siphon action of the siphon tube 12 is continued. Can be kept.

Further, the bubble discharging mechanism as described above is
Bubble trapping chamber 11 and auxiliary siphon tube 12
The construction cost is low because no driving source such as electricity is required, and the pump is not required. Therefore, the running cost is low and the maintenance can be easily performed.

FIG. 3 is a sectional view of a main part showing another embodiment of the present invention. In addition, since the overall configuration of the siphon-type water intake device can be formed in the same manner as in the above embodiment,
Detailed illustration and description are omitted.

The bubble trapping chamber 21 shown in this embodiment is provided at the highest point 4c of the siphon tube 4 via a bubble rising tube 23 having a bubble rising valve 22, and has an exhaust valve 24 at the upper part. An exhaust pipe 25 is provided continuously. The inside of the bubble trapping chamber 21 is divided by a cylindrical screen 26 into an inner bubble inflow chamber 27 communicating with the bubble rising pipe 23 and the exhaust pipe 25 and a bubble outflow chamber 28 on the outer circumference. .

An inflow portion 32a of an auxiliary siphon tube 32 having a venturi 31 is provided below the bubble outflow chamber 28. The venturi 31 is provided with air (air) trapped in the bubble trapping chamber 21. A bubble discharge pipe 33 for suction is connected. This bubble discharge pipe 33
Is formed by a small-diameter flexible tube, and the air suction portion 33a at the tip is supported by a float 34 floating on the water surface in the bubble trapping chamber 21.

The screen 26 is provided for removing dirt and the like in the water to prevent clogging of the narrowed portion of the venturi 31. The screen 26 has an eye corresponding to the diameter of the venturi 31. Used.
Note that an orifice may be used instead of the venturi.

The auxiliary siphon tube 32 is formed of a small-diameter pipe capable of obtaining a flow velocity sufficient to accompany and discharge air, as in the embodiment described above.
Also, it is formed with a volume capable of catching a large amount of bubbles at the time of stopping water intake or the like.

When water is taken from the reservoir by the siphon type water intake device shown in this embodiment, first, the shutoff valves at both ends of the siphon pipe 4 are closed, and the bubble rising valve 22 and the exhaust valve 24 are opened as described above. Then, water is injected from the water injection valve 9 into the siphon pipe 4. The air in the siphon pipe 4 is
2. It is discharged to the outside through the bubble trap chamber 21 and the exhaust valve 24. As a result, the water level in the siphon pipe 4 gradually rises, flows into the bubble trapping chamber 21 and flows into the venturi 31.
When the water level becomes higher, water flows into the auxiliary siphon pipe 32 and a siphon action is generated in the auxiliary siphon pipe 32. Then, when the exhaust valve 24 and the water injection valve 9 are closed, the shutoff valve on the reservoir side of the siphon pipe 4 is opened, and then the shutoff valve on the pipeline side is opened, the water intake operation is started by the siphon action of the siphon pipe 4.

The bubbles trapped in the bubble trapping chamber 21 through the bubble rising pipe 23 during the water intake operation are transferred to the bubble trapping chamber 21.
The energy of the water flowing from inside to the auxiliary siphon pipe 32 is sucked into the venturi 31 through the bubble discharge pipe 33 and discharged together with the water flowing in the auxiliary siphon pipe 32.

As described above, by forming the venturi 31 so as to suck the air, the auxiliary siphon tube 32 is formed.
It is possible to reliably prevent a large amount of air from flowing into the inside and losing the siphon effect. In addition, since the portion where the venturi 31 and the like are provided is partitioned by the screen 26, the venturi 3 is removed due to dust and the like contained in the withdrawn water.
1 can be prevented from being clogged. Further, by supporting the air suction portion 33a of the bubble discharge pipe 33 with the float 34, it is possible to use a small-diameter pipe, which is difficult to stand alone, as the bubble discharge pipe 33, and a large amount of air flows into the auxiliary siphon pipe 32. Can be more reliably prevented.

[0031]

As described above, according to the siphon-type water intake apparatus of the present invention, since the air bubbles in the siphon pipe can be reliably eliminated, a stable siphon action can be obtained, and the water from the reservoir or the like can be obtained. Water can be efficiently taken over the embankment.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a siphon type water intake device of the present invention.

FIG. 2 is a sectional view of a main part of the same.

FIG. 3 is a sectional view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reservoir, 2 ... Pipeline, 3 ... Embankment, 4 ... Siphon pipe, 5 ... Shutoff valve, 6 ... Intake float, 7 ... Flexible pipe, 8 ... Shutoff valve, 9 ... Water injection valve, 10 ... Exhaust valve, 11 ... bubble trapping chamber, 12 ... auxiliary siphon tube, 13 ... bubble rising tube,
14 ... air discharge pipe, 15 ... shut-off valve, 21 ... bubble trapping chamber,
22: bubble rising valve, 23: bubble rising tube, 24: exhaust valve,
25 ... exhaust pipe, 26 ... screen, 27 ... bubble inflow chamber,
28: bubble outflow chamber, 31: venturi, 32: auxiliary siphon tube, 33: bubble discharge tube, 34: float

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Ogawa 5-8, Mitsuya-cho, Nagahama-shi, Shiga Prefecture Mitsubishi Plastics Co., Ltd. Nagahama Plant (72) Inventor Hiromi Onuma 75 Nojiri, Kurito-cho, Kurita-gun, Shiga Prefecture Sekisui Chemical Inside the corporation

Claims (4)

[Claims] 1. A siphon-type water intake device that takes in water from a reservoir or the like by a siphon pipe and supplies it as irrigation water, etc., wherein a bubble trap chamber for trapping bubbles in the siphon pipe, and a branch from the siphon pipe. A small-diameter auxiliary siphon tube, and a small-diameter bubble discharge tube that connects the upper part of the bubble trap chamber and the auxiliary siphon tube to discharge air in the bubble trap chamber to the auxiliary siphon tube. Siphon type water intake device. 2. A siphon-type water intake device that takes in water from a reservoir or the like with a siphon pipe and supplies the water as irrigation water, etc., wherein a bubble trapping chamber for trapping bubbles in the siphon pipe, A small-diameter auxiliary siphon tube connected to the lower part, and a small-diameter air bubble discharge tube connecting the upper part of the bubble trap chamber and the auxiliary siphon tube are provided, and the auxiliary siphon tube moves air in the bubble discharge tube into the auxiliary siphon tube. A siphon-type water intake device comprising a venturi or an orifice for suctioning water. 3. The air bubble capturing chamber is divided into a bubble inflow chamber communicating with the siphon pipe and a bubble outflow chamber communicating with the auxiliary siphon pipe and the bubble discharge pipe by a screen installed inside. The siphon type water intake device according to claim 2, characterized in that: 4. The siphon-type water intake device according to claim 2, wherein the bubble discharge pipe is a flexible pipe body having an air suction portion at a tip end supported by a float.