JP2022071187A - Water level adjustment device for rice paddy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water level adjustment device for rice paddy capable of setting with a simple operation, a water level of a rice paddy, and suppressing unintended displacement of a set position of the water level.

SOLUTION: A water level adjustment device 10 for rice paddy comprises: a movable part 11 comprising an inflow hole 11a into which water in the rice paddy flows, and an outflow hole 11b from which the water in the rice paddy flows out. The movable part 11 is movable in a vertical direction, and a force required to move the movable part 11 upward is less than the force required to move the movable part 11 downward.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a paddy field water level adjusting device for adjusting a water level in a paddy field.

Conventionally, as a water level adjusting device for adjusting the water level of a paddy field, a water level adjusting device having a cylinder having drainage ports formed on the upper portion and the peripheral surface and a mounting pipe for supporting the cylinder is known (for example, a patent). See Document 1). According to such a water level adjusting device, depending on the height position of the cylinder, the amount of water in the paddy field that exceeds the desired water level is discharged from the drainage port of the cylinder to the lower drainage channel, etc. The desired water level can be maintained.

By the way, in recent years, in order to prevent flooding of drainage channels lower than paddy fields due to a rapid increase in local precipitation due to global warming, for example, the water level adjuster for paddy fields shown in Patent Document 2 is known. ing. According to Patent Document 2, a packing is attached to the connection portion between the lower vertical pipe and the upper vertical pipe, and the upper vertical pipe is provided while ensuring water stoppage between the lower vertical pipe and the upper vertical pipe by this packing. It is configured so that it can be fixed at a predetermined height position with respect to the lower vertical pipe.

Japanese Unexamined Patent Publication No. 2010-0222324 Utility Model Registration No. 3023087

However, in the water level adjuster of the paddy field shown in Patent Document 2, the upper vertical pipe set to a predetermined height is unexpectedly set to a predetermined height because the water pressure higher than expected is applied to the upper vertical pipe in a high rainfall such as during a guerrilla rainstorm. There was a problem that the set water level was likely to drop.

On the other hand, if the locking force of the packing is strengthened to prevent the upper vertical pipe from dropping unintentionally, a large force is required to move the upper vertical pipe up and down when setting the water level. There was a concern that workability would be reduced.

The present invention has been made in consideration of such circumstances, and is a paddy field that can improve workability when setting the water level of the paddy field and can prevent the position of the set water level from being unexpectedly displaced. A water level adjusting device is provided.

In order to solve the above problems, the present invention proposes the following means.
That is, the present invention is a paddy field water level adjusting device that adjusts the water level of a paddy field to an arbitrary height position, and is a movable portion having an inflow port into which water in the paddy field flows in and an outflow port into which water in the paddy field flows out. The movable portion can be moved in the vertical direction, and the force required for the movement is smaller when the movable portion is moved upward than when the movable portion is moved downward. It is characterized by that.

Further, the present invention is a paddy field water level adjusting device that adjusts the water level of a paddy field to an arbitrary height position, and is a movable cylindrical tubular body in which one end and the other end form an open surface and the water level of the paddy field flows out inside. A tube, a tubular body through which the movable tube is movably inserted along the central axis direction, and an opening on one end side of the tubular body that covers the outer peripheral surface of the tubular body near one end. A lid body having a covering area covering the peripheral portion and having a first opening through which the movable tube can be inserted, and a second opening arranged inside the lid body through which the movable tube can be inserted. An annular member provided with an annular elastic member having a third opening sandwiched between the covering region of the lid and the annular member inside the lid and slidable through the movable tube. At least, the opening diameter of the third opening is the same as or smaller than the outer diameter of the movable tube, and the opening diameter of the third opening is larger than the opening diameter of the first opening and the opening diameter of the second opening. Is also small.

Further, in the present invention, it is preferable that the opening diameter of the second opening is smaller than the opening diameter of the first opening.

Further, in the present invention, the thickness of the annular member along the central axis direction is preferably in the range of 2 mm or more and 3 mm or less.

Further, in the present invention, the opening diameter of the first opening is preferably in the range of 170 mm or more and 190 mm or less.

Further, in the present invention, it is preferable that the peripheral edge portion of the opposite surface of the surface where the annular member contacts the elastic member is in contact with the opening edge portion of the tubular body.

Further, in the present invention, it is preferable that the annular member is made of a material having a hardness higher than that of the elastic member.

According to the present invention, it is possible to provide a paddy field water level adjusting device that can improve workability when setting a water level in a paddy field and prevent the position of the set water level from being unexpectedly displaced. ..

It is explanatory drawing which shows the installation example of the water level adjustment device for paddy field of this invention. It is an external perspective view which shows the water level adjustment device for paddy field of one Embodiment of this invention. It is sectional drawing of the water level adjusting device for paddy field shown in FIG. FIG. 3 is an enlarged cross-sectional view of a main part of the paddy field water level adjusting device shown in FIG. It is an enlarged sectional view of the main part which shows the state at the time of pulling up a movable tube. It is an enlarged sectional view of the main part which shows the state at the time of pushing in a movable tube.

Hereinafter, the paddy field water level adjusting device according to the embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments shown below is specifically described in order to better understand the gist of the invention, and is not limited to the present invention unless otherwise specified. In addition, the drawings used in the following description may be shown by enlarging the main parts for convenience in order to make the features of the present invention easy to understand, and the dimensional ratios of each component are the same as the actual ones. It is not always the case.

FIG. 1 is an explanatory diagram showing an installation example of a paddy field water level adjusting device.
The paddy field water level adjusting device 10 of the present invention is installed, for example, in the drainage portion 3 of the paddy field 2 provided on the downstream side of the reservoir 1. Then, the paddy field water level adjusting device 10 is connected to the drainage channel (irrigation canal) 5 downstream of the paddy field 2 via, for example, an underground drainage pipe 4, and the amount of water exceeding a predetermined water level is discharged to the drainage channel (drainage channel). It is drained to the irrigation canal) 5.

FIG. 2 is an external perspective view showing a paddy field water level adjusting device according to an embodiment of the present invention. Further, FIG. 3 is a cross-sectional view of the paddy field water level adjusting device shown in FIG. Further, FIG. 4 is an enlarged cross-sectional view of a main part of FIG.
In the paddy field water level adjusting device 10 of the present embodiment, a cylindrical movable tube 11 in which one end 11a and the other end 11b form an open surface and water for the paddy field flows out inside, and the movable tube 11 is in the central axis C direction. It is provided with a tubular body 12 that is movably inserted into the inside along the line.

Further, the paddy field water level adjusting device 10 has a covering region 13f that covers the outer peripheral surface 12s of the tubular body 12 near one end 12a and covers the peripheral edge portion of the opening 12p on the one end 12a side of the tubular body 12. It comprises a lid 13 that is formed and has a first opening 13p through which the movable tube 11 can be inserted.

Further, the paddy field water level adjusting device 10 is arranged inside the lid body 13 and has an annular member 14 having a second opening 14p through which the movable pipe 11 can be inserted, and a covering region of the lid body 13 inside the lid body 13. It is sandwiched between the 13f and the annular member 14, and includes an annular elastic member 15 having a third opening 15p capable of sliding the movable tube 11.

Further, the paddy field water level adjusting device 10 covers the outer peripheral surface 12s of the tubular body 12 near the other end 12b, and bends and extends in two directions perpendicular to the central axis C direction of the movable pipe 11. I have.

The movable pipe 11 is, for example, a substantially cylindrical pipe member entirely made of resin. The movable tube 11 is formed so that the outer diameter is, for example, about 150 mm to 160 mm. Inside the movable tube 11, a funnel-shaped orifice 21 whose opening diameter gradually decreases is formed from one end 11a to the other end 11b. The orifice 21 regulates the flow rate of drainage from the paddy field 2 (see FIG. 1) that passes through the inside of the movable pipe 11 from one end 11a toward the other end 11b. It should be noted that such an orifice 21 may not be particularly provided inside the movable tube 11.
Further, a handle 22 that serves as a clue for pulling up the movable tube 11 along the central axis C direction is rotatably attached to one end 11a side of the movable tube 11.

The tubular body 12 is, for example, a substantially cylindrical pipe member entirely formed of resin. A movable tube 11 is housed inside the tubular body 12 so as to be movable along the central axis C direction. Further, the outer peripheral surface 12s of the tubular body 12 is covered with the lid body 13 and the connecting body 16.

The lid body 13 is, for example, a lid-shaped member that is entirely made of resin and one of which is cylindrical and is bent in the radial direction. A portion of the lid 13 in which one of the cylinders is bent in the radial direction forms a covering region 13f. Then, the annular member 14 and the elastic member 15 are housed inside the covering region 13f of the lid body 13.

The first opening 13p of the lid 13 is preferably formed in a range where the opening diameter is, for example, 170 mm or more and 190 mm or less. The first opening 13p of the lid 13 is formed so that the opening diameter thereof is larger than the opening diameter of the second opening 14p of the annular member 14 and the opening diameter of the third opening 15p of the elastic member 15. ..
The clearance Δ1 between the opening edge of the first opening 13p of the lid 13 and the outer peripheral surface 11s of the movable tube 11 is, for example, about 20 to 40 mm.

The annular member 14 is, for example, a disk-shaped member made of resin or metal, and is in contact with the elastic member 15 on one surface 14a side of the annular member 14 and has this elasticity between the inside of the covering region 13f of the lid 13. The member 15 is sandwiched. The annular member 14 is preferably formed so that the thickness along the central axis C direction is, for example, 2 mm or more and 3 mm or less. Further, it is preferable that the annular member 14 is formed by using a material having a hardness higher than that of the elastic member 15.

As the hardness of the annular member 14, for example, the hardness (HRR) of the Rockwell hardness tester on the R scale can be used. Examples of hardness of the annular member 14 by material are HRR = 110 to 120 in the case of polyvinyl chloride, HRR = 80 to 90 in the case of polypropylene, and HRR = 60 to 70 in the case of polyethylene. As the hardness of the annular member 14, for example, it is preferable to use one having HRR = 110 or more.

The peripheral edge portion of the other surface 14b of the annular member 14 is in contact with the opening edge portion 12ae of one end 12a of the tubular body 12. As a result, the annular member 14 is pressed toward the inside of the covering region 13f of the lid 13, and the annular member 14 and the elastic member 15 are locked to the covering region 13f side inside the lid 13.

The second opening 14p of the annular member 14 is formed so that its opening diameter is smaller than the opening diameter of the first opening 13p of the lid 13 and larger than the opening diameter of the third opening 15p of the elastic member 15. ing. The clearance Δ2 between the opening edge of the second opening 14p of the annular member 14 and the outer peripheral surface 11s of the movable tube 11 is, for example, about 0 to 2 mm.

The elastic member 15 is an annular member made of, for example, rubber or elastic resin. The elastic member 15 is in contact with the inside of the covering region 13f of the lid 13 on the one side 15a side and is in contact with the annular member 14 on the other surface 15b side, whereby the elastic member 15 is in contact with the covering region 13f of the lid 13. It is sandwiched between the annular member 14 and the annular member 14.

The opening diameter of the third opening 15p of the elastic member 15 is formed so as to be the same as or smaller than the outer diameter of the movable tube 11 in a state where the elastic member 15 is not expanded or contracted. That is, when the opening diameter of the third opening 15p is smaller than the outer diameter of the movable tube 11, is a part of the elastic member 15 compressed with the movable tube 11 inserted through the third opening 15p? Alternatively, the peripheral portion of the third opening 15p is bent toward the lid 13 or the annular member 14. By utilizing the elastic deformation of the elastic member 15, the movable tube 11 can be moved along the central axis C direction and can be locked at an arbitrary position.

Further, the opening diameter of the third opening 15p of the elastic member 15 is formed to be smaller than the opening diameter of the first opening 13p of the lid 13 and the opening diameter of the second opening 14p of the annular member 14.

The connecting body 16 has a substantially T-shaped cross-sectional view, and is connected to the tubular body 12 so that one end 16a side thereof covers a part of the outer peripheral surface 12s of the tubular body 12. Further, the bottom portion 16e of the connecting body is branched in two directions perpendicular to the central axis C direction of the movable pipe 11, one of which is a drainage opening 16e1 and the other is a drainage opening 16e2. ing.

Of these, the drainage opening 16e1 is connected to the drainage pipe 4 (see FIG. 1) to drain the water from the paddy field 2 to the drainage channel (irrigation canal) 5 on the downstream side. Further, the drainage opening 16e2 is for draining the water of the paddy field 2 lower than the set water level of the paddy field water level adjusting device 10 toward the drainage opening 16e1, and is closed by the closing plug 16v except when the paddy field 2 is drained. Will be done.

The relationship between the openings of the openings of the respective members of the paddy field water level adjusting device 10 of the present embodiment having the above configuration is as follows.
1st opening 13p (cover 13)> 3rd opening 15p (elastic member 15)
2nd opening 14p (annular member 14)> 3rd opening 15p (elastic member 15)
Outer diameter of movable tube 11 ≧ 3rd opening 15p (elastic member 15)
With
The relationship is that the first opening 13p (cover body 13)> the second opening 14p (annular member 14)> the outer diameter of the movable tube 11.

Next, the operation of the paddy field water level adjusting device 10 of the present embodiment having the above configuration will be described.
In the paddy field water level adjusting device 10 of the present invention, for example, the central axis C direction of the movable pipe 11 is in the vertical direction (vertical direction) in the drainage portion 3 (see FIG. 1) of the paddy field 2 in which the drainage pipe 4 is installed in the ground. ) Is installed. The paddy field water level adjusting device 10 is embedded in the paddy field 2 so that the movable pipe 11 projects into the paddy field 2.

Then, for example, when the water level of the paddy field 2 rises due to rainfall or the like and exceeds one end 11a forming one open end of the movable tube 11, the water of the paddy field 2 overflows and flows into the movable tube 11 to form a connecting body 16. It is drained from the drainage opening 16e1 of the above to the drainage channel (irrigation channel) 5 on the downstream side of the paddy field 2 via the drainage pipe 4. As a result, the water level of the paddy field 2 is maintained at the same level as or lower than the height of one end 11a of the movable pipe 11 of the paddy field water level adjusting device 10.

At the time of drainage by the paddy field water level adjusting device 10, the maximum flow rate of the drainage flowing inside the movable pipe 11 is limited by the orifice 21 formed inside the movable pipe 11. This prevents the drainage channel (irrigation canal) 5 from overflowing due to a large amount of drainage flowing into the drainage channel (irrigation canal) 5 on the downstream side in a short time.

The movable pipe 11 that sets the water level of the paddy field 2 has a vertical direction due to the elastic force of the elastic member 15 having a third opening 15p that is the same as or smaller than the outer diameter of the movable pipe 11 in a state where the opening diameter is not expanded or contracted. It can be locked at any position along the line. Thereby, the maximum water level of the paddy field 2 can be set to an arbitrary height.

Then, when the setting of the maximum water level of the paddy field 2 is changed by using the paddy field water level adjusting device 10 of the present embodiment installed in the paddy field 2, the movable pipe 11 is along the central axis C direction, that is, the vertical direction. Is done by moving up and down. For example, when raising the maximum water level of the paddy field 2, the handle 22 of the movable tube 11 is grasped and the movable tube 11 is pulled upward in the vertical direction, and one end 11a of the movable tube 11 is set to the desired maximum water level of the paddy field 2. Adjust to the position where.

Since the opening diameter of the first opening 13p of the lid 13 is formed to be larger than the opening diameter of the third opening 15p of the elastic member 15, the edge of the third opening 15p of the elastic member 15 is upward. Allows to bend.
As shown in FIG. 5, when the movable tube 11 is pulled up, the edge of the third opening 15p of the elastic member 15 in contact with the outer peripheral surface 11s of the movable tube 11 is affected by the elastic force of the elastic member 15. As the movable tube 11 rises, it curves upward.

In this way, by making the edge of the third opening 15p of the elastic member 15 bend upward when the movable tube 11 is pulled up, the pulling force required for pulling up the movable tube 11 can be reduced. By reducing the pulling force required for pulling up the movable pipe 11, the operator can easily pull up the movable pipe 11 and adjust the maximum water level of the paddy field 2 to a higher level. For example, even when a large water pressure is applied to the orifice 21 of the movable tube 11 due to heavy rain or the like, the adjustment is possible.

On the other hand, for example, when lowering the maximum water level of the paddy field 2, lower the movable pipe 11 so as to push it downward in the vertical direction, and align one end 11a of the movable pipe 11 with the position where the desired maximum water level of the paddy field 2 is reached. ..

Since the opening diameter of the second opening 14p of the annular member 14 is formed to be larger than the opening diameter of the third opening 15p of the elastic member 15, the edge of the third opening 15p of the elastic member 15 is downward. Allows to bend.
As shown in FIG. 6, when the movable tube 11 is pushed in, the edge of the third opening 15p of the elastic member 15 in contact with the outer peripheral surface 11s of the movable tube 11 is affected by the elastic force of the elastic member 15. As the movable tube 11 descends, it curves downward.

In this way, when the movable tube 11 is pushed in, the edge portion of the third opening 15p of the elastic member 15 can be bent downward, so that the pushing force required for pushing the movable tube 11 can be easily obtained by the operator. 11 can be pushed in to adjust the maximum water level of the paddy field 2 to a lower level.

The first opening 13p of the lid 13 that sandwiches the elastic member 15 that supports the movable tube 11 is formed so that the opening diameter is larger than the second opening 14p of the annular member 14, so that the movable tube is formed. The edge of the third opening 15p of the elastic member 15 can be curved more greatly when the elastic member 15 is pulled upward than when it is pushed downward. That is, the force required for the movement of the movable tube 11 is smaller when the movable tube 11 is pulled upward than when it is pushed downward.

As a result, even if a large water pressure is applied to the orifice 21 due to heavy rain, for example, the movable tube 11 can be easily pulled up with a small force, while the movable tube 11 is pushed downward by the water pressure, and the maximum is high. It is possible to prevent the water level from changing unexpectedly low.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

The relationship between the opening diameters of the first opening of the lid, the second opening of the annular member, and the third opening of the annular member of the present invention and the pulling force and pushing force of the movable tube was investigated. The results are shown in Table 1.

According to the results shown in Table 1, each sample formed so that the opening diameter of the first opening of the lid is larger than the opening diameter of the second opening of the annular member has the same first opening and the second opening. Compared to each sample formed in diameter, the difference between the pulling force and pushing force of the movable tube is 50 N or more, which reduces the stress when pulling up the movable tube and unexpectedly causes the movable tube to be water pressure. It was confirmed that it was possible to suppress being pushed.

10 ... Water level adjusting device for paddy fields 11 ... Movable pipe 12 ... Cylindrical body 13 ... Lid body 13p ... First opening 14 ... Circular member 14p ... Second opening 15 ... Elastic member 15p ... Third opening

Claims (1)

It is a paddy field water level adjusting device that adjusts the water level of a paddy field to an arbitrary height position.
It has a movable part with an inlet for the water of the paddy field and an outlet for the water of the paddy field to flow out.
The movable part is movable in the vertical direction and can be moved in the vertical direction.
A paddy field water level adjusting device, characterized in that the force required for movement is smaller when the movable portion is moved upward than when the movable portion is moved downward.

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