JPH10271921A - Irrigation apparatus for paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an irrigation apparatus capable of carrying out irrigation so as to attain a desired water level without requiring an electric source and, in the case of requiring a large amount of water, capable of manually supplying a large amount of water. SOLUTION: This apparatus is equipped with a main valve for manually opening and closing a flow channel from an inlet 11 to an outlet 12, a small valve having a smaller flow channel area than that of the main valve installed in the flow channel, a float 60 moving corresponding to the water level in a paddy field, a locking mechanism for transmitting the displacement of the float 60 to the small valve and a water level adjusting means for manually changing the water level in a paddy field by closing a small valve attached to part of the locking mechanism in a main body 10 equipped with the inlet 11 communicating with a water channel for irrigation and the outlet 12 communicating with a paddy field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an irrigation system capable of maintaining a water level in a paddy field at a desired water level, particularly in a case where irrigation is rapidly performed by a device having a simple structure and a case where the water level in a paddy field is maintained at a predetermined water level. The present invention relates to an irrigation system for paddy fields that can be used by switching between the above.

[0002]

2. Description of the Related Art An irrigation device for automatically stopping irrigation when a water level in a paddy field reaches a predetermined water level is known from Japanese Patent Application Laid-Open No. Hei 8-37950. In this known device, a water level sensor detects a water level in a paddy field and operates a motor-operated valve such that the detected water level matches a preset target water level.

On the other hand, there is also known a so-called float valve which detects a water level with a float in order to keep the water level constant, and closes the valve by buoyancy acting on the float when the water level reaches a predetermined value.

[0004]

However, among the prior arts, in a device for maintaining a water level at a desired value by a combination of a water level sensor and a motor-operated valve, a power source for driving the motor-operated valve and a sensor from the sensor are provided. A signal processing device for processing the signal is required, and there is a problem that the price of the device is high to install in each paddy field.

In the case of a float valve which does not require a power source, there is a problem that the valve diameter cannot be increased because the valve is closed by buoyancy acting on the float. In particular, there is a problem that it is not possible to cope with a case where a large amount of water is to be drawn into a paddy field in a short time, such as when shaking.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paddy field which can perform irrigation to a desired water level without requiring a power source and, when a large amount of water is required, can manually take in a large amount of water. It is to provide an irrigation device.

[0007]

The object of the present invention is to manually open and close a flow path from the inlet to the outlet in a main body having an inlet connected to an irrigation water channel and an outlet connected to a paddy field. And a slave valve provided in the flow passage and having a smaller flow area than the master valve, a float responsive to the water level in the paddy field, and an interlocking mechanism for transmitting the displacement of the float to the slave valve. This is achieved by providing a water level adjusting means provided in a part of the interlocking mechanism for manually changing a paddy water level for closing the child valve.

In the device of the present invention, when irrigating to a desired water level, the child valve is directly displaced by the float, so that a power supply for driving the valve is not required. A large-diameter parent valve was opened, enabling irrigation in a short time.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which an irrigation device embodying the present invention is installed on a levee of a paddy field. As shown in FIG. 1, a main body 10 of the apparatus has a rectangular parallelepiped shape. A rectangular outlet 12 is opened on the side facing the paddy field, and an inlet 11 is provided on the other surface. The inflow port 11 communicates with the irrigation channel by a water guide pipe (not shown). A lid 14 that can be opened and closed by a hinge is provided on the upper surface of the main body 10.

FIG. 2 is a longitudinal sectional view of the irrigation apparatus, and shows a main body 1.
A cylindrical valve chamber 20 communicating with the inflow port 11 is formed in the inside of the valve chamber 20, and the valve port 21 of the parent valve opened downward at the lower end of the valve chamber 20.
Is formed. An annular packing 22 for maintaining water tightness with the valve body 25 is attached around the valve port 21.

The valve body 25 of the master valve is arranged so as to close the valve port 21 from below, and is fixed to the lower end of a master valve rod 26 extending vertically outside the valve chamber 20. The rod 26 is connected to the valve chamber 2
A pair of upper and lower guides 2 extending further laterally from the outer surface of 0
7, the upper end of which is connected to the manual operation arm 28.

The arm 28 is rotatably supported by a pin of a support 20a which stands upright on the upper end surface of the valve chamber 20.
8 is manually lifted upward, and by the lock lever 29,
By keeping the arm 28 at the position shown by the solid line in the figure, the master valve is closed. When the lock lever 29 is removed and the arm 28 is set in the two-dot chain line state, the master valve is opened.

A valve port 30 for a child valve is opened at the center of the valve element 25 for the parent valve, and the valve port 30 is opened and closed by a valve element 31 for the child valve.
The valve element 31 of the child valve is fixed to the upper end of the child valve rod 33.
The slave valve rod 33 extends downward and is guided by a guide 34 rising from the main body 10 so as to allow only vertical movement.

As shown in detail in FIG. 3, a pair of rollers 33a are attached to the child valve rod 33, and the rollers 33a are engaged with the upper end surface of the child valve lever 32.
That is, when the child valve lever 32 is in the state of FIG.
The child valve rod 33 is pushed upward through the roller 33a, and the valve port 30 is closed by the valve element 31 of the child valve.

The left end of the child valve lever 32 is rotatably supported by a support 36 extending downward from the valve element 28 of the parent valve.

A roller 39 provided at the right end of the slave valve lever rides on the flange portion 42 below the screw rod 40, and 39 and 39 'according to the vertical displacement of the screw rod 40.
Swings between

Guides 44a and 44b for guiding the vertical movement of the screw rod 40 are fixedly provided on the main body 10, and a handle 46 is fixed to the upper end of the screw rod 40. A water level setting arm 50 is screwed to the rod 40, and the arm 50 extends to the side and engages with the upper end of the float 60.

A float guide 62 extending vertically through the center of the float for guiding the float 60 is provided on the main body 1.
It is provided on the 0 side. Screw rod 40 and water level setting arm 5
The screwing position of 0 can be changed by operating the handle 46.

A wave-eliminating plate 70 is arranged so as to divide a portion in which the parent valve and the child valve are stored and a portion in which the float is stored, and the wave-eliminating plate 70 has a slit 71 through which the child valve lever 32 penetrates. Provided. The valve storage section and the float storage section communicate with each other through the slit 71, and the water level of both sections is always the same.

A scale 51 for confirming the set water level is connected to the end of the water level setting arm 50.
Reference numeral 1 extends upward and slides in a sheath-shaped guide 53. A window shown in FIG. 4 is opened on the upper surface of the horizontal portion of the guide 53, and the set water level is confirmed by looking at the scale indicated by the pointer provided in this window.

Next, the operation of this device will be described.
When the water level setting arm 50 is at the solid line position shown in FIG. 2, the set water level is zero, and even when the water level of the paddy field is zero, the float 60 receives buoyancy by the water dependent on the bottom of the main body 10, and the child valve Is closed and no water is supplied.

The water level setting arm 5 is operated by operating the handle 46.
0 is moved to the upper part of the screw rod 40 and the float 60
Is in that position, the hydraulic pressure acting on the valve element 31 of the slave valve and the rod 40, arm 50, lever 32, rod 3
3. The slave valve lever 32 is displaced clockwise by its own weight such as the valve element 31. Therefore, the valve element 31 of the child valve opens the valve port 30 and guides the water from the inflow port 11 to the paddy field through the outflow port 12.

When the water level in the paddy field rises, float 6
0 is displaced upward, and the upper end of the float 60 engages the water level setting arm 50 and pushes it upward. The displacement of the water level setting arm 50 is transmitted to the child valve lever 32 through the screw rod 40, the flange 42, and the roller 39, and is transmitted to the child valve lever 32.
The irrigation is stopped by rotating 2 counterclockwise to close the valve port 30 with the valve element 31 of the slave valve.

That is, when the paddy water level reaches the set water level, the water supply is automatically stopped. Thereafter, if the paddy water level drops for some reason, the buoyancy acting on the float again decreases, so that the child valve opens to supply water.

When the child valve is open, the water passing through the child valve hits the water surface, and the water surface in the main body 10 may be ruffled. However, the wave-eliminating plate 70 reduces the adverse effect on the float 60. .

The setting water level of the paddy field can be easily changed by changing the position of the water level setting arm 50 on the screw rod 40 by the handle 46. That is, the water level setting arm 5
The higher the position of 0, the higher the paddy water level.

This adjustment operation can be performed while looking at the scale of the scale 51 with the pointer of the guide 53, so that it is easy to set a desired water level.

Further, in order to facilitate the operation of setting the water level,
The diameter of the screw rod 40 is increased, the pitch of the screws is increased, and the position of the water level setting arm 50 can be largely changed only by turning the handle 46 several times. Further, in order to avoid an increase in mass when the diameter of the screw rod 40 is increased, the material of the screw rod 40 is a synthetic resin material.

Next, when a large amount of water is taken into the paddy field at the time of initial water intake or the like, the lock of the lock arm 29 is released, and the operation arm 28 is displaced to the chain line position 28 '.

As the operation arm 28 is displaced, the parent valve rod 26 also moves downward in parallel, and the valve element 25 of the parent valve moves downward together with the child valve and the child valve lever 32 to open the large-diameter valve port 21.

Since the valve port 21 of the parent valve is set to be larger than the diameter of the inflow port 11, when the valve port 21 is opened, a large amount of water can flow efficiently, and water can be supplied in a relatively short time. it can.

When the water level of the paddy field rises and the float 60 is displaced upward when the parent valve is open, a large downward pressure is exerted by the water pressure acting on the valve element 25 of the parent valve. No displacement occurs in the closing direction, and water can be supplied continuously.

When the parent valve is open, the water supply cannot be stopped automatically even if the paddy water rises. In this case, the parent valve is manually closed after an appropriate time has elapsed.

In the embodiment described above, the valve port 30 of the child valve
Is formed on the valve body 21 of the parent valve, but it can be provided independently and separately.

[0035]

As described above, according to the present invention,
Water can be supplied until the water level in the paddy field reaches a desired level without using a power supply or the like with a simple device, and when a large amount of water is required, it can be switched to manual to easily supply a large amount of water.

[Brief description of the drawings]

FIG. 1 is a diagram showing an installation state of a paddy irrigation apparatus embodying the present invention.

FIG. 2 is a longitudinal sectional view of the irrigation apparatus of the present invention.

FIG. 3 is a detailed sectional view of a child valve portion.

FIG. 4 is a diagram showing a scale unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Body, 11 ... Inlet, 12 ... Outlet, 20 ... Valve chamber, 21 ... Parent valve port, 25 ... Parent valve valve element, 26 ... Parent valve rod, 28 ... Operation arm, 30 ... Child valve The mouth of the 31 ...
Child valve element, 32 ... Child valve lever, 40 ... Screw rod, 4
6 Handle, 50 Water level setting arm, 60 Float

Claims (5)

[Claims] A main valve for manually opening and closing a flow path from the inflow port to the outflow port in a main body having an inflow port communicating with an irrigation water channel and an outflow port communicating with a paddy field; A slave valve having a smaller flow passage area than the master valve, a float responding to the water level in the paddy field, an interlocking mechanism for transmitting the displacement of the float to the slave valve, and a part of the interlocking mechanism. A paddy field irrigation device, further comprising a water level adjusting means provided for manually changing a paddy water level at which the child valve is closed. 2. The paddy field irrigation device according to claim 1, wherein the child valve is provided in a part of the parent valve. 3. An interlocking mechanism comprising: a child valve lever having one end rotatably supported by the master valve and extending in a horizontal direction; and a screw rod engaged with the other end of the child valve lever and extending in a vertical direction. 2. The paddy field irrigation device according to claim 1, further comprising a water level setting arm screwed to said screw rod and having one end engaged with said float. 4. The water level adjusting means includes: a screw rod;
4. The paddy field irrigation device according to claim 3, comprising: the water level setting arm; and a handle for manually changing a screwing state between the screw rod and the water level setting arm. 5. A wave canceling plate for partitioning the inside of the main body into a portion in which the float is stored and a portion in which the master valve and the child valve are stored, and the child valve lever penetrates the wave canceling plate. 4. The paddy field irrigation device according to claim 3, wherein the irrigation device extends.