JPH1128028A - Water level adjuster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ready and convenient water level adjuster capable of maintaining the water level of mainly paddy field in the optimum state. SOLUTION: An inner cylinder 6 is engaged with the inside of an outer cylinder 5. A window part 7 is formed toward one end of the outer cylinder 5. The window part 7 is provided with a weir 8 whose height is adjustable by the inner cylinder 6. The bottom of the outer cylinder 5 is connected to one end of an already built drain pipe with laying the window part 7 upward. In this state, the inner cylinder 6 is moved to a fixed height position. When the water level of water for use reaches the height of the weir 8 in irrigation, the water for use overflows the weir, flows from the window part 7 into the inner cylinder, is discharged from the interior of the inner cylinder through a drain pipe to the outside. Consequently the water level can be adjusted to the upper end position of the inner cylinder only by changing the height of the inner cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level regulator mainly used for maintaining irrigation water at an optimum water level.
More specifically, the present invention relates to a water level adjuster that uses a drain pipe installed in a paddy field and sequentially drains excess water while maintaining irrigation water introduced from an intake port at an optimum water level.

[0002]

2. Description of the Related Art Generally, a water supply channel for irrigation and a drainage channel are provided adjacent to each other in a paddy field so that a required amount of water can be drawn from the water supply channel as needed. A drain pipe is laid from the bottom of the paddy field to the drainage channel, and a part or all of the stored water can be discharged to the drainage channel through the drainage pipe.

[0003] Here, in a paddy field, it is required to adjust the water level in accordance with the growth of seedlings and climatic changes. For example, in the early May and June of rice transplanting, the water level is set to about 3 to 5 cm, and from the end of June to the beginning of July, all the water is released to the outside from mid-July. The water level is maintained at about 10 cm. During September, intermittent watering is performed alternately between watering and watering, and before harvesting, water is entirely discharged to dry the soil.

Conventionally, such adjustment is performed by preventing sand water from flowing out by, for example, stacking sandbags around a drain outlet, and in this state, directly feeding water from a water supply channel, or using power from a pump or the like. Water until it reaches the optimal water level,
When lowering the water level, the sandbags were broken to release excess water.

[0005]

However, the work of stacking and removing sandbags is cumbersome and labor intensive.
Moreover, stacking sandbags in a paddy field reduces the cultivated area and reduces the yield.

[0006] In addition, during irrigation, the water level is adjusted by opening and closing the water intake from the water supply channel, and by operating an irrigation device equipped with a pump and the like. However, it takes time to reach the optimum water level. In some cases, the water intake was left open or the irrigation device was operated, leaving the field and submerging the seedlings.

There is also known an irrigation apparatus having a water level detector and automatically stopping water supply when a set water level is reached.
Such a device has a problem that it has a complicated mechanism and is large in size, and is expensive and expensive to install.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a light water level regulator which can maintain the water level of a paddy field in an optimum state.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises an outer cylinder having a drainage window formed on a peripheral wall, and an inner cylinder fitted inside the outer cylinder. The outer cylinder has the window formed near one end in the axial direction, and the lower end is connected to one end of the drain pipe with the window facing upward, and the inner cylinder is movable in the axial direction of the outer cylinder. The lower end of the weir is lower than the lower edge of the window, and a height-adjustable weir is formed in the window, and a handle for operation is provided inside the inner cylinder leaving a water-passing area. And a water level adjuster.

Here, the inner cylinder may be a cylinder having an outer diameter substantially equal to the inner diameter of the outer cylinder. However, in order to improve watertightness, the inner cylinder may have a peripheral wall. Preferably, a slit is formed from one end to the other end along the axial direction, and the width of the slit is reduced so that the slit is fitted into the outer cylinder in a press-fit state.

According to such an inner cylinder, the restoring force causes the outer peripheral surface to be in close contact with the inner peripheral surface of the outer cylinder, so that the watertightness between the outer cylinder and the inner cylinder is improved, and water leakage can be prevented. Although it is possible, it is more preferable to equip the inside of the inner cylinder with a spring for urging the width of the slit in the expanding direction, as in the invention of claim 3.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, FIG. 1 shows a use state of a water level adjuster according to the present invention. In FIG. 1, 1 is a paddy field, 2 is a drainage channel provided along the paddy field,
From there, a drain pipe 3 is laid toward the drain channel 2. Here, the water level adjuster 4 according to the present application is made upright, and the lower end thereof is connected to, for example, one end of the drain pipe 3.

Next, FIG. 2 shows a water level adjuster according to the present invention. As will be apparent from this figure, the water level adjuster 4 according to the present application includes a cylindrical outer cylinder 5 and an inner cylinder 6 fitted inside the outer cylinder. In addition, both end surfaces of the outer cylinder 5 and the inner cylinder 6 are chamfered.

The outer cylinder 5 is, for example, a cylinder made of vinyl chloride or other synthetic resin having an axial length of 30 to 80 cm and a diameter of 10 to 30 cm, and a peripheral wall 5A at one axial end thereof is drained with a required opening ratio. The opening 7 is opened, and the other end is made to have substantially the same length as the axial length of the inner cylinder 6 so that the entire circumference is covered by the peripheral wall 5A. Here, the window portion 7 is, for example, ２〜 to １ ／ of the axial length of the outer cylinder 5 and ５ to 1/1 / of the peripheral wall.
The outer cylinder 5 has a square shape having a width of 4 and is formed near one axial end of the outer cylinder 5. Then, according to the outer cylinder 5, the lower end 5B is connected to one end of the drain pipe 3 extending from below the paddy field toward the drain channel with the window portion 7 facing upward.

On the other hand, the inner cylinder 6 has the same cylindrical shape as the outer cylinder 5, and its outer peripheral surface is in close contact with the inner peripheral surface of the outer cylinder 5. In particular, the inner cylinder 6 has an axial length of 1/3 to 2/3 of that of the outer cylinder 5 so as to be movable in the axial direction of the outer cylinder 5 and has its lower end 6A lower than the lower edge 7A of the window 7. A height-adjustable weir 8 is formed in the window 7 on the peripheral wall of the inner cylinder. That is,
The window 7 is opened in order from the top and closed in order from the bottom by the inner cylinder 6 fitted inside.

FIG. 3 is a perspective view showing the inner cylinder. As is apparent from FIG. 3, a handle 10 is provided inside the inner cylinder 6 except for a water passage area 9 through which water can pass. Can be Further, a slit 11 is formed in the peripheral wall of the inner cylinder 6 in a series along the axial direction from the one end to the other end.

As shown in FIG. 4, a bracket 12 protrudes inside the inner cylinder 6 through a slit 11 and a spring 13 is interposed between the brackets to form a slit. 11 is urged in the widening direction. The spring 13 is supported by a shaft 14 passing therethrough. The shaft 14 penetrates the bracket 12, and a flange 15 for preventing detachment is provided at both ends outside the bracket.

Here, the inner cylinder 6 is formed using a pipe material having the same diameter as the outer cylinder 5, and when the inner cylinder 6 is fitted to the outer cylinder 5, the slit 1 is formed.
1 is reduced in width and fitted into the outer cylinder 5 in a press-fit state. Therefore, the outer peripheral surface of the inner cylinder 6 is brought into close contact with the inner peripheral surface of the outer cylinder 5 by the restoring force and the elasticity of the spring 13, and the water tightness between the inner cylinder 6 and the inner cylinder 6 can be improved.

The inner cylinder 6 is inserted into the outer cylinder 5 with the slit 11 not being exposed from the window 7 of the outer cylinder 5, for example, as shown in FIG. For this reason, the inner cylinder 6 has a weir 8 formed in the window 7 with a peripheral wall excluding the slit 11 so that water can pass only above the upper end thereof. The handle 10 has its both ends fixed to the inner cylinder 6 with screws. In order to make the expansion and contraction of the inner cylinder 6 in the radial direction uniform as a whole, and to bring the entire outer periphery into close contact with the inner peripheral surface of the outer cylinder 5. It is preferable to configure the handle 10 with a telescopic shaft.

By the way, in order to adjust the water level of the paddy field by the water level adjuster 4 constructed as described above, first, as shown in FIG. Connect to one end of drain pipe 3. In particular, the outer cylinder 5 has a lower edge 7 of the window 7.
The lower end is buried such that A is lower than the installation surface G, that is, the bottom of the paddy field. Here, the inner cylinder 6 is slid in the axial direction of the outer cylinder 5 up to a position where the lower end 6A is slightly lower than the lower edge 7A of the window 7 by several millimeters. The upper end 6B of the lever is several cm from the upper edge 7B of the window 7.
In the lower limit position, the upper end 6B of the inner cylinder is slightly above or below the lower edge 7A of the window below the installation surface G.

Therefore, at the time of irrigation, the inner cylinder 6 is connected to the handle 10.
And move it up and down to make it the required height.
A weir 8 is formed at the bottom. Then, in this state, irrigation water is introduced into the paddy field 1. When the amount of water gradually increases and reaches the upper end of the inner cylinder 6, the irrigation water passes through the upper end 6B of the inner cylinder 6 and passes through the window portion 7. It flows into the inner cylinder 6 and is discharged to the drainage channel 2 through the drainage pipe 3. That is, the water level of the paddy field 1 is maintained at the upper end 6B of the inner cylinder 6, that is, at the height position of the weir 8, so that even if the intake port is forgotten to be closed, the water level can be prevented from rising.

On the other hand, the water level can be lowered by lowering the inner cylinder 6. At this time, the water level can be adjusted to the position of the upper end 6B of the inner cylinder 6. Therefore, before harvesting or the like, the upper end 6B of the inner cylinder 6 can be made lower than the installation surface G to discharge all the water stored in the paddy field.

Although the embodiment of the present invention has been described above, according to the water level adjuster according to the present invention, the window 7 is not limited to being formed with one end of the outer cylinder 5 leaving a constant width. 6, the window 7 may be formed in a concave shape that opens to one end of the outer cylinder 5. Further, the water level adjuster according to the present application can be used not only for adjusting the water level of irrigation water but also for adjusting the water level of ponds, water tanks and the like.

[0024]

As is apparent from the above description, according to the present invention, the inner cylinder having a drainage window formed therein and the inner cylinder fitted inside the outer cylinder have a double structure. Because the water level of the paddy field can be adjusted only by adjusting the height, it is light, and even if you forget to close the intake, the seedlings do not submerge,
In addition, the handle is provided on the inner cylinder, so its operability is good, and the installation can be done easily by connecting the lower end of the outer cylinder to the existing drain pipe, so that the installation work is easy, and the occupied area is the diameter of the outer cylinder , So that dead space can be reduced and arable land can be used effectively.

Further, a series of slits are formed in the peripheral wall of the inner cylinder to reduce the width of the slits so that the inner cylinder is fitted into the outer cylinder in a press-fit state. The watertightness between them is high, and the water level can be adjusted as set. In particular, since a spring for biasing the slit in the widening direction is provided, the watertightness between the outer cylinder and the inner cylinder is remarkably improved, and the accuracy of water level adjustment can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a paddy field as an example of use of a water level adjuster according to the present invention.

FIG. 2 is a perspective view showing an example of a water level adjuster according to the present invention.

FIG. 3 is a perspective view showing an inner cylinder constituting the water level adjuster.

FIG. 4 is a cross-sectional view at right angles to the axis showing a state where the inner cylinder is fitted inside the outer cylinder.

FIG. 5 is an installation state diagram showing the water level adjuster of the present application in a partially broken manner.

FIG. 6 is a perspective view showing another embodiment of the water level adjuster according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paddy field 2 Drainage channel 3 Drain pipe 4 Water level adjuster 5 Outer cylinder 6 Inner cylinder 7 Window 8 Weir 9 Water flow area 10 Handle 11 Slit 12 Bracket 13 Spring

Claims (3)

[Claims] An outer cylinder having a drainage window formed on a peripheral wall thereof;
The outer cylinder is formed of an inner cylinder fitted inside the outer cylinder, wherein the outer cylinder forms the window near one end in the axial direction, and the lower end is connected to one end of the drain pipe with the window facing upward, Further, the inner cylinder is configured to be movable in the axial direction of the outer cylinder, and a lower end thereof is formed below the lower edge of the window to form a height-adjustable weir in the window. Is a water level adjuster characterized by being provided with a handle for operation while leaving the water area. 2. The inner cylinder has a slit formed in its peripheral wall extending from one end to the other end along the axial direction, and the width of the slit is reduced so that the inner cylinder is fitted into the outer cylinder in a press-fit state. Water level adjuster according to 1. 3. The water level adjuster according to claim 2, wherein a spring for biasing the width of the slit in the expanding direction is provided inside the inner cylinder.