JPH0322334Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a check valve that is attached to a drainage hole provided in the side wall of an agricultural waterway, etc.

(Prior Art) Originally, in agricultural waterways and the like, drainage holes are provided here and there because the water pressure of underground water may lift the entire waterway and destroy it. If the water level of the waterway is below the drainage hole,
The water in the soil is discharged into the waterway, but if the water level is above the drain hole, there is a disadvantage that the water can conversely escape into the soil through the drain hole.

Therefore, conventionally, a check valve has been installed in the water drain hole, such as the one shown in FIG. 6 (Japanese Utility Model Publication No. 47-30985). In this conventional example, a pipe b is buried obliquely in a side wall a of a waterway, a valve seat c is formed by slanting the middle of the pipe b, and a float ball valve d with a circular cross section and a diameter close to the inner diameter of the pipe b is installed. When the water level of the water is higher than the drain hole, the float valve d closes as shown by the solid line, and when the water level is low, the valve escape preventing part e closes as shown by the chain line. Regarding e, the valve hole f is opened to discharge underground water to the waterway.

(Problems to be Solved by the Invention) In the conventional example, the pipe must be installed diagonally, making construction difficult and requiring skill. In order to avoid these drawbacks, it is possible to move the float ball valve vertically within the pipe to open and close the valve hole, but if the float ball valve is perfectly circular as in the conventional example, In addition to the required lifting distance, the diameter of the pipe must be increased, which not only increases manufacturing costs but also makes installation difficult.

(Means for solving the problems) This idea eliminates all the drawbacks mentioned above.
In other words, a horizontal plate 2, a partition plate 3,
3' to form upper and lower water passages 4, 5, a valve hole 6 is bored in the horizontal plate 2 to communicate the upper and lower water passages 4, 5, and a float ball valve 7 is formed in a flat shape. It is characterized in that a protrusion 8 for preventing rolling is provided protruding from the upper surface, and the float ball valve 7 is placed in the water passage 5 below, and the protrusion 8 is made to face the valve hole 6.

(Example) Figures 1 to 4 show the first embodiment of this invention, in which a straight pipe 1 is formed with a round pipe, and a crank-shaped cross section is inserted into the pipe 1 as shown in the first figure. A horizontal plate 2 and partition plates 3, 3' are provided to form upper and lower water passages 4,
5, and the inner dimension height of the lower water passage 5 is l,
A valve hole 6 is bored in the horizontal plate 2 to communicate the upper and lower water passages 4 and 5. In addition, the float ball valve 7 is made of vinyl chloride and is formed hollow and flat.
A protrusion 8 for preventing rolling is integrally provided to protrude from the upper center surface of the float ball valve 7. Note that the upper convex arc surface PQ (part of which is virtual and is shown as a dashed line) for reliably sealing the valve hole 6 is a part of a circle drawn with point o as the center in FIG. The long axis m of the float ball valve 7 is made larger than the inner height l. Further, the float ball valve 7 is placed in the lower water passage 5, and the protrusion 8
is made to protrude from the valve hole 6 into the water passageway 4 above. In addition, in the figure, 14 is a perforated plate for preventing the inflow of earth and sand.

Next, the usage and operation of this first embodiment will be explained.
The embodiment is buried horizontally in a lower position within the container, with the open end 1a facing the side soil 11 side and the open end 1b facing the water channel 9 side. If the water level of the waterway 9 is low and there is no water in the pipe 1, the float valve 7 will descend due to gravity as shown by the two-dot chain line in Figure 1, and if there is a small amount of water increases slightly depending on the amount. When the valve hole 6 is open in this way, water in the side soil 11 passes through the opening end 1a, the water passageway 4, the valve hole 6, the water flow waterway 5, and the waterway 9, as shown by the chain line arrow in FIG. leaks to. Now, when the water level rises, the first
As indicated by the solid line arrow in the diagram, water in the water channel 9 enters the water passage 5 from the open end 1b, and the float valve 7 floats up, securely contacts the valve hole 6, and closes. In addition, if the float ball valve 7 is tilted to the left for some reason as shown by the solid line in FIG. Since the arc surfaces 7' and 7'' contact the valve hole 6 and the inner surface of the water passage 5', there is no risk of it rolling or coming out of the pipe 1.Furthermore, as the water level rises, the float ball valve 7 rises and is always The valve hole 6 is reliably closed between PQ.

The one shown in FIG. 5 is a second embodiment of this invention, in which the perforated plate 1 and the rod 13 are fixed in the water passage 5, and the rolling of the float ball valve 7 can be more reliably prevented. At the same time, it is possible to completely prevent the float ball valve 7 from moving out of the tube. Further, in the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted. Note that if it is desired to increase l from the first embodiment, the valve height may be increased; in any case, when the float ball valve 7 is tilted, the protrusion 8 will lock into the valve hole 6, and no further rolling will occur. It is better if you don't do it.

(Effects of the invention) This invention does not require the pipe to be installed at an angle as in the conventional example, but can be installed horizontally, making it easy to install without requiring any skill. It can be raised and lowered to completely close the valve hole, and in particular, the float ball valve is made into a flat shape, so it can be downsized using a small diameter pipe.
It can be manufactured at low cost and is easier to transport and install, and since the float ball valve is provided with protrusions to prevent it from rolling, it will not roll in the pipe and get caught. There is no risk of it going outside the jurisdiction.

[Brief explanation of the drawing]

Figures 1 to 5 show examples of this invention. Figure 1 is a sectional view of the first embodiment in use, and Figure 2 is A-A.
A sectional view, 3rd is a partially cutaway plan view, 4th is an explanatory diagram showing the inclination situation of the float ball valve, 5th is a sectional view of the second embodiment, and 6th is a sectional view of the conventional example. It is a diagram. 1...Pipe, 2...Horizontal plate, 3, 3'...Partition plate,
4, 5... Water passageway, 6... Valve hole, 7... Float ball valve, 8... Protrusion.

Claims (1)

[Scope of utility model registration request] A horizontal plate 2 and partition plates 3, 3' are provided in a straight pipe 1 to form upper and lower water passages 4, 5.
A valve hole 6 is bored in the hole to connect the upper and lower water passages 4 and 5,
Further, the float ball valve 7 is formed into a flat shape, and a protrusion 8 for preventing rolling is provided protruding from the upper surface, and the float ball valve 7 is placed in the water passage 5 below and the protrusion 8 is made to face the valve hole 6. A characteristic check valve for waterways.