JP5113690B2 - Air valve device - Google Patents

Description

  The present invention relates to an air valve device, and more specifically, takes water from a water source through a siphon pipe, and supplies air in the water supply pipe in a siphon type water intake apparatus that supplies water to a user from a water supply pipe connected to the downstream side of the siphon pipe. The present invention relates to an air valve device for discharging to the outside.

There is known a siphon-type water intake device that takes water from a water source such as a reservoir (reservoir) or a lake by a siphon pipe installed over a dam body and supplies the water as irrigation water (see, for example, Patent Document 1). Moreover, the general water supply pipe is provided with an air valve for automatically discharging the air in the water supply pipe to the outside (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 2001-45888 Japanese Patent No. 3418871

  In the siphon-type water intake device, if a large amount of air is mixed in the siphon tube, the siphon action is lost and water cannot be taken from the water source. Therefore, various air discharges for discharging the air in the siphon tube from near the highest point of the siphon tube. Means are provided. In addition, since the water supply pipe connected to the downstream side of the siphon pipe is generally provided with a water gradient, if the flow velocity in the water supply pipe slows or the flow of water stops, the water gradient in the water supply pipe causes As the air bubbles rise toward the siphon pipe, an air valve is placed at the highest point of the water supply pipe, and the air bubbles in the water supply pipe are discharged outside to prevent the air bubbles from flowing into the siphon pipe from the water supply pipe. ing.

  Under normal irrigation conditions, bubbles generated in the siphon pipe are carried downstream by the flow of water flowing from the siphon pipe toward the water supply pipe, flowing out to the water supply destination with the water, or installed in the water supply pipe Since the air valve is discharged to the outside, a large amount of air does not accumulate in the siphon pipe or the water supply pipe, and a stable water supply state can be maintained. However, when water supply is temporarily interrupted due to the weather or work, if the water supply valve that branches from the water supply pipe to each water supply destination is closed sequentially, the flow velocity in the water supply pipe gradually becomes slower, Bubbles in the water supply pipe begin to rise upstream due to the water gradient, and finally a large amount of air rises toward the highest point of the water supply pipe. In particular, if a large amount of water is consumed on the downstream side compared to the amount of water supplied from a siphon intake device on a steep slope, air may be sucked into the water supply pipe from an air valve or a shutoff valve. A larger amount of air will rise in the water supply pipe.

  When bubbles (air) concentrate and rise in the water supply pipe, air cannot be captured sufficiently by the air valve, so that air flows backward from the water supply pipe into the upstream siphon pipe, and a large amount of air enters the siphon pipe. was there. If a large amount of air is mixed in the siphon tube, the siphon operation will be lost, so in order to obtain the siphon operation when resuming water intake, water must be poured into the siphon tube or vented from the siphon tube. It takes a lot of work and time to do it.

  Accordingly, an object of the present invention is to provide an air valve device that can efficiently discharge air in a water supply pipe in a siphon-type water intake device and can reliably prevent the inflow of air from the water supply pipe into the siphon pipe. It is said.

  In order to achieve the above object, the air valve device of the present invention takes water from a water source through a siphon tube, and supplies water to a user from a water supply tube connected to the downstream side of the siphon tube. Valve device for discharging the air to the outside, wherein the water supply pipe is divided into an upstream water supply pipe and a downstream water supply pipe, and at each end of the upstream water supply pipe and the downstream water supply pipe A riser pipe bent upward is connected to each of the riser pipes, and a valve box of an air valve provided with a float and a valve portion that opens and closes by raising and lowering the float is connected to the upper part of the riser pipe, and the riser pipe It is characterized in that the upper parts of each are connected via a connecting pipe.

  Further, the air valve device of the present invention takes water from a water source with a siphon pipe, and air in the water supply pipe in the siphon type water intake apparatus that supplies water to a user from a water supply pipe connected to the downstream side of the siphon pipe is externally provided. An air valve device for discharging, wherein the water supply pipe is divided into an upstream water supply pipe and a downstream water supply pipe, and upwards at respective ends of the upstream water supply pipe and the downstream water supply pipe Each bent riser pipe is provided, and a valve box of an air valve having a float and a valve part that opens and closes by raising and lowering the float is connected to the upper part of each riser pipe, and the upper parts of the riser pipes are connected to each other. It is characterized by being connected via.

  Furthermore, a lower connecting pipe for connecting lower portions of the rising pipes is provided, and a partition plate is provided for vertically controlling the rising of the bubbles into the valve box by vertically dividing the rising pipe and the connecting pipe. The pipes and the valve box are made of synthetic resin and are formed by combining straight pipes and joints of the same size, between the pipe wall upper part of the downstream water supply pipe and the upper part of the valve box. Are connected by an exhaust pipe.

  According to the air valve device of the present invention, air (bubbles) rising in the water supply pipe can be reliably captured by the rising pipe and discharged to the outside. In particular, by providing risers on the upstream side and the downstream side, air can be captured more efficiently and discharged to the outside. Further, by using a plurality of branch pipes and connection pipes connecting the upstream side and the downstream side, it is possible to suppress an increase in water flow resistance in the rising pipe portion. Furthermore, by making each pipe and valve box the same size, member costs and construction costs can be reduced.

  1 and 2 show a first embodiment of the air valve device of the present invention. FIG. 1 is a sectional view of the air valve device, and FIG. 2 is an example of a siphon type water intake device for irrigation incorporating the air valve device. It is explanatory drawing shown.

  First, the siphon-type water intake device shown in the present embodiment takes water from a basin 1 serving as a water source and supplies water to a cultivated area (not shown) via a water supply pipe 2 that is a pipeline for irrigation. A siphon tube 4 constituting a siphon is arranged on the body 3. On the reservoir side 4a of the siphon tube 4, there is provided a flexible tube 7 connected to the intake water float 6 through a shutoff valve 5, such as a check valve, one-way valve, gate valve, etc. The water supply pipe 2 is connected via a shutoff valve 8. In addition, a trap 9 is provided in the upstream portion of the water supply pipe 2 to suppress the rise of bubbles from the water supply pipe 2 to the siphon pipe 4, and near the highest point of the water supply pipe 2 on the downstream side of the trap 9. An air valve device 10 is provided. In addition, although illustration is abbreviate | omitted, the downstream side of the water supply pipe 2 has branched to several branch lines, or has branched to several cultivation area water supply apparatuses etc., and the length of the water supply pipe 2 is several hundred m May be reached.

  The air valve device 10 divides the water supply pipe 2 in the middle into an upstream water supply pipe 2a and a downstream water supply pipe 2b, and is connected to each end of the upstream water supply pipe 2a and the downstream water supply pipe 2b, The pipe is bent upward by 11b, and the first short pipes 12a, 12b, the first cheese 13a, 13b, the second short pipes 14a, 14b, and the second cheese 15a, 15b are sequentially placed above the elbows 11a, 11b. Connected to form rise pipes 16a and 16b, and further, valve boxes 19a and 19b of air valves 18a and 18b are connected to the upper portions of the second cheeses 15a and 15b via third short pipes 17a and 17b. ing.

  Further, between the valve boxes 19a, 19b of the air valves 18a, 18b and the rising pipes 16a, 16b, the first cheeses 13a, 13b and the second cheeses 15a, 15b are connected by the fourth short pipes 20a, 20b. Connected connecting pipes 21a and 21b (lower connecting pipe 21a and upper connecting pipe 21b) are provided. Accordingly, the water flowing down from the upstream water supply pipe 2a is bent upward by the upstream elbow 11a and rises up the rising pipe 16a, and flows down the downstream rising pipe 16b through the connecting pipes 21a and 21b. The downstream elbow 11b is bent in the horizontal direction and flows to the downstream water supply pipe 2b.

  The air valves 18a and 18b are provided with floats 23a and 23b in the valve boxes 19a and 19b through guide members 22a and 22b so as to be movable up and down, and exhaust holes 25a and 25b in the center of the valve box upper lids 24a and 24b, respectively. The floats 23a and 23b are raised when the water level in the valve boxes 19a and 19b rises to close the exhaust holes 25a and 25b. When the water levels in the valve boxes 19a and 19b are lowered, the floats 23a and 23b are provided. Is lowered to open the exhaust holes 25a, 25b.

  Normally, a siphon-type water intake device that supplies irrigation water, after completing the injection of water into the siphon pipe 4 and generating a siphon action, keeps the upstream shut-off valve 5 open and the downstream shut-off valve 8. The water intake is started and stopped by opening and closing. During intake, both shut-off valves 5 and 8 are opened, and the shut-off valves and water supply valves in the branch line and the cultivation area water supply device provided downstream of the water supply pipe 2 are set to an opening degree corresponding to the irrigation situation. Yes. At this time, the water in the pond 1 is sucked into the siphon pipe 4 by the siphon action due to the difference in level between the water level in the pond 1 and the highest point of the water pipe 2 and supplied to the water pipe 2 through the dam body 3 to supply water. Water is supplied from the pipe 2 to a downstream water supply destination, for example, a water supply device in a plurality of cultivation areas.

  The air valves 18a and 18b are in a state in which the floats 23a and 23b are lowered to the lower portions of the guide members 22a and 22b and the exhaust holes 25a and 25b are opened before the water supply pipe 2 is filled with irrigation water. It has become. When the shutoff valve 8 is opened and water supply is started, the water in the riser pipes 16a and 16b and the valve boxes 19a and 19b flows from the air valves 18a and 18b to the outside through the supply of water to the air valve device 10 from the upstream water supply pipe 2a. To be discharged. When the amount of water flowing from the upstream water supply pipe 2a through the air valve device 10 to the downstream water supply pipe 2b after the start of water supply increases and the water level in the valve boxes 19a, 19b rises to a predetermined height, the water level rises. As a result, the floats 23a and 23b that have floated close the exhaust holes 25a and 25b, and the discharge of air from the air valves 18a and 18b stops.

  When the amount of water supply is very small, bubbles contained in the water flowing down from the upstream water supply pipe 2a and bubbles rising in the water in the downstream water supply pipe 2b having a low flow velocity are caused from the rising pipes 16a and 16b to the valve box 19a. , 19b and rise in the valve box 19a, 19b to push down the water level. When the amount of air in the valve boxes 19a and 19b increases and the water level is pushed down to a predetermined position, the floats 23a and 23b are lowered to open the exhaust holes 25a and 25b, and the air in the valve boxes 19a and 19b The water level in the valve boxes 19a, 19b rises again to a predetermined position.

  If the amount of water supply increases and the flow rate of the water in the downstream water supply pipe 2b exceeds the rising speed of the bubbles, the bubbles in the water flowing through the downstream water supply pipe 2b do not float in the downstream water supply pipe 2b. It flows to the water supply destination with water. During the water supply, the floats 23a and 23b move up and down in accordance with the fluctuations in the water levels in the valve boxes 19a and 19b, the exhaust holes 25a and 25b open and close appropriately, and the operation of discharging the air accumulated inside is repeated.

  When the shutoff valve 8 on the upstream side is closed during the water supply, the inside of the water supply pipe 2 is decompressed by the action of the water flowing downstream, but when the pressure is reduced, the floats 23a and 23b are sucked into the water supply pipe 2. As a result, the exhaust holes 25a and 25b are opened and outside air is sucked into the water supply pipe 2 from the exhaust holes 25a and 25b, so that the water supply pipe 2 is not in a negative pressure state. 2 to prevent the pipes, joints, and the like constituting 2 from being damaged.

  In a normal water supply state, that is, in a water supply state in which bubbles flow downstream with the water without rising in the downstream water supply pipe 2b, the branch line and the cultivation area water supply device located downstream of the downstream water supply pipe 2b are shut off. When the valve or the water supply valve is closed, the flow rate of the water in the downstream side water supply pipe 2b gradually decreases, so the rising speed of the bubbles flowing downstream with the water exceeds the flow rate of the water. As a result, the bubbles in the working water flow backward to the upstream side due to the water gradient of the downstream water supply pipe 2b, and small bubbles gradually gather to generate a large air mass.

  The generated air mass rises in the downstream water supply pipe 2b so as to push away the water in the downstream water supply pipe 2b, and reaches the air valve device 10. The rising energy of the air mass rising in the downstream side water supply pipe 2b varies depending on the water gradient (inclination angle) of the downstream side water supply pipe 2b. However, when many air masses are generated or irrigation for supplying water to the terraced rice terraces When the inclination angle of the downstream water supply pipe 2b is large as in the case of the siphon type water intake device, the energy sufficient to reverse the water in the siphon pipe 4 from the air valve device 10 through the upstream water supply pipe 2a and the trap 9 In the case of a conventional normal air valve, most of the air mass passes through the air valve portion and flows into the siphon tube 4 without being lifted into the valve box, thereby invalidating the siphon action. It will be.

  On the other hand, the air mass that has reached the air valve device 10 shown in the present embodiment changes the flow direction upward from the downstream water supply pipe 2b by the elbow 11b and rises in the rising pipe 16b. The air rises quickly into the valve box 19b, and the float 23b descends by pushing down the water level in the valve box 19b by the raised air, and the exhaust hole 25b opens to exhaust the air raised in the valve box 19b to the outside. .

  Further, since the flow direction of the air mass is directed upward, the amount of air flowing into the riser pipe 16a on the upstream side through the connecting pipes 21a and 21b provided in the horizontal direction can be reduced. Further, the air that has flowed into the upstream rising pipe 16a through the connecting pipes 21a and 21b rises in the rising pipe 16a toward the valve box 19a, lowers the float 23a, and opens the exhaust hole 25a. It is discharged from the valve box 19a to the outside through the exhaust hole 25a.

  Thus, by providing a pair of rising pipes 16a and 16b between the upstream water supply pipe 2a and the downstream water supply pipe 2b, and providing the air valves 18a and 18b above the rising pipes 16a and 16b, the downstream An air mass rising in the side water supply pipe 2b can be efficiently and promptly discharged from the air valves 18a and 18b. In particular, since the flow of the air mass is bent upward, the energy of the air mass can be reduced, and the water and the air mass can be effectively separated, and the air mass flows into the upstream water supply pipe 2a. Can be prevented. As a result, the intrusion of air into the siphon tube 4 can be reliably prevented and the siphon action is not lost, so that the next water supply can be performed easily and quickly.

  In addition, by providing a plurality of connecting pipes 21a, 21b connecting the valve boxes 19a, 19b and the rising pipes 16a, 16b, an increase in water flow resistance during water supply can be minimized. A decrease in the amount of water supply due to the provision of the air valve device 10 can be suppressed. Furthermore, by forming each short pipe, each elbow and each cheese constituting the rising pipes 16a and 16b, and the valve boxes 19a and 19b of the air valves 18a and 18b by combining the same size made of synthetic resin, Member costs and construction costs can be reduced.

  In addition, by installing the air valve device 10 as described above, bubbles rising from the water supply pipe 2 toward the siphon pipe 4 can be reliably discharged, and thus the trap 9 can be omitted. Become. Thus, conventionally, it has been necessary to dig deeper in the place where the trap 9 is installed, but this is not necessary, so that the construction cost can be reduced.

  3 to 9 are diagrams showing other embodiments of the air valve device of the present invention. In the following description, the same components as those of the air valve device shown in the first embodiment are given the same reference numerals, and detailed description thereof is omitted.

  The air valve device of the second embodiment shown in FIG. 3 is obtained by replacing the elbows 11a and 11b in the air valve device shown in the first embodiment with bends 31a and 31b, and includes an upstream water supply pipe 2a and By increasing the degree of bending from the downstream water supply pipe 2b to the rising pipes 16a and 16b, an increase in water flow resistance during water supply is suppressed.

  The air valve device of the third embodiment shown in FIG. 4 includes three connecting pipes 21a and 21b in the air valve device shown in the first embodiment, with the addition of third cheeses 32a and 32b and a short tube 33. By providing the connecting pipes 21a, 21b, and 21c and increasing the number of connecting pipes, the increase in the flow resistance of water during water supply is suppressed as in the above, and the volume of the upper part of the air valve device is increased so that air mass is more reliably To be able to capture.

  In this way, the number of connecting pipes can be set arbitrarily according to conditions such as the maximum flow rate during irrigation, the water gradient of the water supply pipe, the size of each pipe, etc. Even if only the connecting pipe is provided, it is possible to sufficiently expect the rising and separating effect of the bubbles.

  The air valve device of the fourth embodiment shown in FIG. 5 is an air valve 18b only above the rising pipe 16b on the downstream side of the two rising pipes 16a and 16b in the air valve device shown in the first embodiment. The valve box 19b is connected, and one end of the elbow 34 is connected to the upper part of the upstream riser 16a through the same short pipe (not shown) instead of the cheese as described above. By connecting the other end of the elbow 34 in the horizontal direction to the branch side of the second cheese 15b of the riser pipe 16b through the same short pipe (not shown), the riser pipes 16a and 16b A connecting pipe 35 for connecting the upper parts is formed.

  The air valve device shown in the fourth embodiment is optimal when the water supply pipe 2 is relatively short, the water gradient is gentle, and the amount of water is small. Moreover, the air valve device shown in the fourth embodiment can be installed with the upstream side and the downstream side reversed.

  The air valve device of the fifth embodiment shown in FIGS. 6 to 8 is replaced with the elbows 11a and 11b and the first short tubes 12a and 12b in the air valve device shown in the first embodiment. , 13b with the branch side opened upward, and between the end of the upstream water supply pipe 2a and the end of the downstream water supply pipe 2b, the first cheese 13a, 13b and the fourth short By connecting the lower connecting pipe 21a formed with the pipe 20a, the upstream side water supply pipe 2a and the downstream side water supply pipe 2b are connected in a straight line.

  On the upper side of the branch side of the first cheeses 13a and 13b, as in the first embodiment, the risers 16a and 16b are connected by connecting the second cheeses 15a and 15b via the second short tubes 14a and 14b. It forms and connects the valve boxes 19a and 19b of the air valves 18a and 18b to the upper portions of the second cheeses 15a and 15b via the third short tubes 17a and 17b, and the branch sides of the second cheeses 15a and 15b are connected to each other. The upper connecting pipe 21b is formed by connecting the four short pipes 20b.

  In the rising pipes 16a and 16b and the upper connecting pipe 21b, a partition plate (separator) 41 for vertically partitioning the inside thereof is installed in the horizontal direction. The separator 41 is formed of a material having air permeability and water permeability, such as a perforated plate or a net plate provided with a large number of small-diameter vent holes 41a, and is connected to the valve boxes 19a and 19b from the rising pipes 16a and 16b. Control bubble rise. That is, when a large air mass floats in the riser pipes 16a and 16b, the separator 41 prevents the air valve 18a and 18b from rising all at once while the air mass remains large, so that the floats 23a and 23b. It is possible to prevent a large amount of air from being blown out vigorously with water from the exhaust holes 25a and 25b.

  In this embodiment, when the flow rate of the water is low with respect to the water gradient and the amount of bubbles rising in the water in the downstream water supply pipe 2b is large, the action of the bubbles rising up the downstream riser 16b Circulating flows as shown by arrows in FIG. 6 are generated inside the rising pipes 16a and 16b and the connecting pipes 21a and 21b. Thereby, even when the amount of bubbles is large and the bubbles cannot be completely discharged from the air valves 18a and 18b, the bubbles that have not been discharged ride on the circulating flow and pass through the rise pipes 16a and 16b and the connection pipes 21a and 21b. Since the air is circulated and discharged from the air valves 18a and 18b in accordance with the fluctuation of the amount of bubbles rising from the downstream side water supply pipe 2b, it is possible to prevent the bubbles from flowing into the upstream side water supply pipe 2a.

  The air valve device according to the sixth embodiment shown in FIG. 9 has an exhaust pipe 42 having a smaller diameter than the downstream water supply pipe 2b between the pipe wall upper part of the downstream water supply pipe 2b and the upper part of the valve box 19b. The air bubbles floating in the water in the downstream water supply pipe 2b are sent into the valve box 19b through the exhaust pipe 42.

  Thereby, the bubble which flows into the 1st cheese 13b side is decreased, and it can be made to capture | acquire a bubble more reliably by the riser pipes 16a and 16b. Thereby, it is possible to prevent bubbles from flowing into the siphon pipe 4 through the upstream water supply pipe 2a.

  In addition, the shape, structure, etc. of the float and the exhaust hole in the air valve can be appropriately selected according to conditions such as the required exhaust amount and the state of earth and sand contained in the irrigation water.

It is sectional drawing which shows the 1st example of an air valve apparatus of this invention. It is explanatory drawing which shows an example of the siphon type water intake device for irrigation incorporating the air valve apparatus of this invention. It is a front view which shows the 2nd example of an air valve apparatus of this invention. It is a front view which shows the 3rd example of an air valve apparatus of this invention. It is a front view which shows the 4th example of an air valve apparatus of this invention. It is sectional drawing which shows the 5th example of an air valve apparatus of this invention. It is VII-VII sectional drawing of FIG. It is a front view of an air valve device similarly. It is a front view which shows the 6th form example of the air valve apparatus of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Reservoir, 2 ... Water supply pipe, 2a ... Upstream side water supply pipe, 2b ... Downstream side water supply pipe, 3 ... Dam body, 4 ... Siphon pipe, 4a ... Reservoir side, 4b ... Water supply pipe side, 5 ... Shut-off valve, 6 Water intake float, 7 Flexible pipe, 8 Shut-off valve, 9 Trap, 10 Air valve device, 11a, 11b Elbow, 12a, 12b First short pipe, 13a, 13b First cheese, 14a, 14b ... 2nd short pipe, 15a, 15b ... 2nd cheese, 16a, 16b ... Rise pipe, 17a, 17b ... 3rd short pipe, 18a, 18b ... Air valve, 19a, 19b ... Valve box, 20a, 20b ... 4th Short pipe, 21a, 21b, 21c ... Connecting pipe, 22a, 22b ... Guide member, 23a, 23b ... Float, 24a, 24b ... Valve box top cover, 25a, 25b ... Exhaust hole, 31a, 31b ... Bend, 32a, 32b ... Third cheese, 33 ... Pipe, 34 ... elbow, 35 ... connection pipe, 41 ... separator, 41a ... vent 42 ... exhaust pipe

Claims (6)

  An air valve device for discharging water in a water supply pipe to the outside in a siphon type water intake apparatus that takes water from a water source with a siphon pipe and supplies water to a user from a water supply pipe connected to the downstream side of the siphon pipe. , The water supply pipe is divided into an upstream water supply pipe and a downstream water supply pipe, and rising pipes bent upward are provided at respective ends of the upstream water supply pipe and the downstream water supply pipe. A valve box of an air valve provided with a float and a valve part that opens and closes by raising and lowering the float is connected to the upper part of the rising pipe, respectively, and the upper parts of the rising pipe are connected to each other via a connecting pipe. Air valve device to do.   An air valve device for discharging water in a water supply pipe to the outside in a siphon type water intake apparatus that takes water from a water source with a siphon pipe and supplies water to a user from a water supply pipe connected to the downstream side of the siphon pipe. The water supply pipe is divided into an upstream water supply pipe and a downstream water supply pipe, and rising pipes bent upward are provided at respective ends of the upstream water supply pipe and the downstream water supply pipe. A valve box of an air valve provided with a float and a valve part that opens and closes by raising and lowering the float is connected to the upper part of the pipe, respectively, and the upper parts of the rising pipes are connected to each other via a connecting pipe. Air valve device.   The air valve device according to claim 1, further comprising a lower connection pipe that connects lower portions of the riser pipes.   The air valve according to any one of claims 1 to 3, wherein a partition plate is provided for partitioning the inside of the riser pipe and the connection pipe into upper and lower parts to control the rise of bubbles into the valve box. apparatus.   5. The air valve device according to claim 1, wherein each of the pipes and the valve box is made of a synthetic resin and is formed by combining a straight pipe and a joint of the same size.   The air valve device according to any one of claims 1 to 5, wherein an upper part of a pipe wall of the downstream water supply pipe and an upper part of the valve box are connected by an exhaust pipe.

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