JPH099800A - Automated watering system for paddy field - Google Patents

Abstract

PURPOSE: To provide an automated watering system for a paddy field which can perform exact irrigation operations without receiving adverse influence from grass, waste or insects and with reduced flowing out of fertilizers and agrochemicals on the downstream. CONSTITUTION: This system comprises a water feeder A equipped with a diaphragm valve 11 which can feed or stop the water fed from a water feeding pipe 13 to a paddy field S and a drainage B which can drain the water over a prescribed water level, when the water S in the paddy field exceeds the prescribed level. In this system, the drainage B is equipped with a controlling means Q for controlling the opening and closing of the diaphragm valve 11 based on the detection of the water level by using a plurality of electrodes 24, 25, 26 which are vertically movable to the water surface and by applying pulses to the electrodes at a timing of a prescribed interval.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for managing the amount of water when water is supplied to a paddy field, and more particularly to a paddy field automatic water supply system that enables long-term automatic operation without human intervention. is there.

[0002]

2. Description of the Related Art In rice cultivation, water is supplied to paddy fields by an irrigation facility such as a water pipe for agriculture, and water is taken in as needed by the growth of rice. Here, since it is necessary to fill the paddy field with water at a certain time in rice cultivation, a person engaged in agricultural work himself opens and closes a valve provided in a water pipe or the like to draw in water. However, in rice cultivation, it is necessary to maintain the water level in the paddy field at a predetermined level according to the growth status of rice, so the valve should be opened and closed or the height of the drainage weir should be adjusted as the water level decreases. Therefore, it was necessary to carry out work such as adjusting the amount of water supply to be drained, and drawing water into the paddy field was a laborious task. Therefore, various paddy field automatic water supply systems have been conventionally proposed in order to eliminate such annoyance, save labor, and reduce waste of water. For example, in one disclosed in Japanese Patent Publication No. 59-26, for example, the opening and closing of a water supply valve for supplying water to a paddy field is directly adjusted by vertically moving a float.

On the other hand, the running down of irrigation water is not only a waste of water but also a problem of environmental destruction due to eutrophication of rivers caused by a large amount of irrigation of paddy fields in which fertilizers and pesticides are dissolved. Conventionally, measures have been taken to prevent the problem. For example, in JP-A-2-47415, as shown in FIG. 7, the paddy field automatic water supply system is roughly divided into a water supply device A and a drainage device B.
Generally, since the water supply device A and the drainage device B are installed separately on the upstream side and the downstream side of the paddy field, the two are often separated by 100 m or more.

The drainage device B is a gate 107 having a drainage port 108 for flowing water into the agricultural drainage channel 109 when the water level of the paddy field 110 exceeds a predetermined height, and a float for detecting the water level. 105 and a ball tap valve 106 that controls the pressure of the control water sent to the water supply device in conjunction with the float 105. The drainage channel 109 generally runs directly into a river. Also, the water supply device A
Is composed of a pipe 103 as a water supply source, a diaphragm valve 101 for supplying or blocking water to the paddy field, and a diaphragm chamber 102 formed above the diaphragm. The diaphragm chamber 102 and the ball tap valve 106 are connected by the control water pipe 104.

Next, the operation of the water supply system will be described. When the water level of the paddy field 110 becomes higher than a predetermined height, in the drainage device B, the water is drained from the drainage port 108 and drainage channel 109.
Is drowned in. At the same time, the float 105 rises and the ball tap valve 106 acts, and the control water pipe 104
Close the control water inside. And diaphragm room 1
02 pressure of control water is applied to the diaphragm valve 101.
Is shut off and the supply of water to the paddy field 110 is shut off. This prevents excess water from running off.
Moreover, when the water level of the paddy field 110 becomes lower than a predetermined height,
In the drainage device B, water is drained from the drain port 108.
I will not be washed away by 9. At the same time, the float 105 descends and the ball tap valve 106 acts, and the control water pipe 1
When the control water valve portion in 04 is opened and the drainage amount from the ball tap valve 106 becomes larger than the pilot inflow amount of the water supply valve, the pressure of the control water applied to the diaphragm chamber 102 disappears and the diaphragm valve 101 opens to open the paddy field. 1
Water is supplied to 10.

[0006]

However, the conventional paddy field automatic water supply system has the following problems. (1) The opening and closing of the water supply device A for supplying water to the paddy field is adjusted by vertically moving the float 105.
There is a problem that the float 105 is entangled with grass and dust floating in the paddy field, and the float 105 does not move up and down according to the water level. Also, the ball tap valve 10
Since No. 6 does not perform the snap action operation, the leakage phenomenon continues for a long time in the transitional period from the closed state to the open state, and dust is caught and becomes unstable. Therefore, the diaphragm valve 101 is also in an unstable state, and there is a problem that dust is easily caught on the diaphragm valve 101. In addition, since the resolution of the water level measurement of the float 105 itself is extremely low, it is unavoidable to perform alignment with a margin, a significant time delay occurs, and the amount of water drained to the water is large, and the downstream river It was not enough in solving the problem of environmental destruction due to eutrophication.

(2) Further, by transmitting the pressure of the control water through the control water pipe 104, the water supply apparatus A
There is a problem that a significant time delay occurs because the water supply and shutoff of the water is controlled. The conventional paddy field automatic water supply system uses the float 105 and water for control.
This is because the paddy field cannot use a power source or the like, and a large current is required to open / close the water supply valve, etc., so that the battery is insufficient. That is, the paddy field automatic water supply system was operated using only water.

In view of the above, the present invention provides an automatic paddy field water supply system capable of performing accurate water supply operation without being affected by grass, dust, insects, etc. The purpose is to provide.

[0009]

In order to solve the above problems, the paddy field automatic water supply system of the present invention has the following configuration. (1) A water supply device equipped with a main water supply valve for supplying or shutting off water supplied from a supply source to a paddy field, and when the water level in the paddy field reaches or exceeds a predetermined level, discharges the water above the predetermined level or higher. A paddy field automatic water supply system having a drainage device that
The drainage device has a plurality of electrodes that can move up and down with respect to the water surface, and a control means that applies a pulse to the electrodes at predetermined intervals to detect the water level and controls the opening and closing of the water supply main valve. There is. (2) In the system described in (1), the water supply device has a pilot-type self-holding solenoid valve for opening and closing the water supply main valve, and the control means is the self-holding solenoid valve. It is characterized by controlling the opening and closing of.

(3) Further, in the system described in (2), the water supply main valve is provided with a valve seat formed on an extension of a pipe communicating with a water supply pipe for supplying water, and above the valve seat. A diaphragm valve element that abuts against the valve to block the release of water,
A pilot port that communicates the diaphragm chamber formed in the upper part of the diaphragm valve body with the pipe, a discharge port formed around the valve seat, a tube that communicates with the diaphragm chamber and the self-holding solenoid valve. And a communication hole for communicating with and. (4) Further, in the system described in (2), the self-holding solenoid valve is arranged in a coil wound in a tubular shape, a valve seat that communicates two ports, and disposed at the center of one end of the coil. A fixed iron core, a plunger having a valve body movably provided in the coil and abutting against the valve seat, and a permanent magnet having both surfaces sandwiched by magnetic members at the other end of the coil. Is characterized by.

(5) Further, in the system described in (2), the control means includes a driving battery and a sampling pulse generator that emits pulse signals at predetermined intervals.
A voltage is applied to the plurality of electrodes by a pulse signal from the sampling pulse generator, the water level is detected by energization when a predetermined electrode is in contact with water, and the detected detection signal is the self-holding solenoid valve. It is characterized by having a water level detector for outputting as a pulse for driving.

[0012]

The automatic paddy field water supply system of the present invention having the above-described structure operates as follows. The farmer sets the drainage device weir to a predetermined height corresponding to the water level in the paddy field. At this time, the plurality of electrodes attached to the weir of the drainage device are moved up and down in conjunction with the drainage device. The control means applies the measurement pulse to the set electrode at a timing of a predetermined interval. Then, the detection signal obtained from the relationship between the electrode and the water level is transmitted to the water supply device as a self-holding solenoid valve drive signal via the control means. This signal drives the self-holding solenoid valve of the water supply device. Then, the water pressure applied to the main water supply valve is controlled by driving the self-holding solenoid valve to open and close the valve.

As a result, the water supplied from the water supply source is supplied to or cut off from the paddy field. That is, the water level in the paddy field is adjusted by the height of the electrode set previously. When the drainage device reaches a predetermined height or higher, the water supply device can be promptly controlled, so that the amount of water flowing downward can be reduced. In addition, it is possible to perform an accurate water supply operation without being affected by grass and dust, and to easily change the water level setting. Detecting the water level in a paddy
It should be done at intervals of 10 minutes or more, and it is necessary to apply a current to the self-holding solenoid valve to move the main water supply valve, but this is only for a moment. Even if the main water supply valve is not used, the self-holding solenoid valve maintains the predetermined state, so that the current consumption is small.

The automatic paddy field water supply system of the present invention
Water from a pipe connected to a water supply pipe for supplying water flows from a pilot port into a diaphragm chamber formed above the diaphragm valve body, and a valve seat formed on an extension of the pipe by pressure applied to the diaphragm valve body. The main valve is opened and closed by controlling the pressure applied to the diaphragm valve body by the control of the self-holding solenoid valve, and is formed around the valve seat when the valve is opened. Water is supplied to the paddy field from the discharged outlet.

The paddy field automatic water supply system of the present invention is
When a current is applied to the coil by the detection signal from the control means, a magnetic pole is generated in the same direction as the magnetism of the permanent magnet, and the plunger is attracted to the fixed iron core, so the valve element is separated from the valve seat and the valve is open. On the other hand, when a current in the opposite direction is applied to the coil by the detection signal from the control means, a magnetic pole is generated in a direction that cancels the magnetism of the permanent magnet, and the plunger separates from the fixed iron core, causing the valve element to hit the valve seat. Upon contact, the self-holding solenoid valve is closed. In addition, the paddy field automatic water supply system of the present invention uses the power from the battery to apply a pulse signal to a plurality of electrodes at intervals of 10 minutes or more by a sampling time generator, and to energize when a predetermined electrode is in contact with water. Thus, the detection signal is output from the control means as a pulse for driving the self-holding solenoid valve.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic paddy field water supply system according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing the configuration of a paddy field automatic water supply system. This paddy field automatic water supply system is roughly divided into a water supply device A for directly supplying water to a paddy field, and a drainage for discharging water at a predetermined level or higher when the water level of the paddy field S becomes higher than or equal to a predetermined level. It is composed of a device B and a control means Q which detects the water level in the paddy field S and controls the opening and closing of the water supply device A. In the present embodiment, the control means Q is configured as a part of the drainage device B, but the control means Q may be configured integrally with the water supply device A, or may be configured separately and independently. Water supply device A
Is arranged at a position where the water supply pipe 13 of the paddy field S is embedded. The drainage device B is arranged near an agricultural drainage channel (not shown). The height of the paddy field S where the water supply pipe 13 is arranged is higher than the height of the paddy field S near the agricultural drainage channel. In addition, agricultural drainage channels are generally directly connected to rivers.

A diversion pipe 13a for diverting water upward is connected to the water supply pipe 13 at a predetermined position of the paddy field S. The upper end of the flow dividing pipe 13a is composed of a diaphragm valve portion 7 that adjusts the flow rate of the water flowing in the water supply pipe 13 and supplied into the paddy field S. The diaphragm valve portion 7 includes a valve seat 34, and a diaphragm valve body 1 that abuts or separates from the valve seat 34 to shut off or open the diversion pipe 13a.
1 is attached. A pilot hole 19 is formed at the center of the diaphragm valve body 11, and water is discharged from the diversion pipe 13a at the outer circumference of the diaphragm valve portion 7 to a water discharge portion 3
5 are formed. Further, a diaphragm chamber 12 is formed above the diaphragm valve body 11. Also,
The diaphragm chamber 12 is provided with a return spring 14 that urges the diaphragm valve body 11 in the direction of abutting the valve seat 34. Further, the diaphragm chamber 12 is connected to an input port of a latch type solenoid valve 16 which is a kind of self-holding type solenoid valve.

The diaphragm valve portion 7 will be described in more detail with reference to the sectional views shown in FIGS. 3 shows the valve closed, and FIG. 4 shows the valve open. In the flow dividing pipe 13a, the diaphragm valve portion 7 is detachably separated on the way, and the mounting portion 13b having the valve seat 34 formed at the upper end is tapered so that the lower end side becomes thin. And valve seat 3
A diaphragm valve body 11 having a central portion formed of a pressure wall so as to abut against No. 4 is disposed so as to be sandwiched between the diaphragm valve body 11 and the cover 36. The diaphragm valve body 11 and the cover 36 form a diaphragm chamber 12. Further, a receiving plate 37 is provided on the upper surface of the diaphragm valve body 11, and the cover 36 is provided.
The diaphragm valve element 11 is urged downward by the return spring 14 disposed between and. On the other hand, the discharge guide 3 is provided on the lower surface of the outer periphery of the cover 36 so that water is discharged downward.
8 is provided, and the discharge guide 38 and the tip of the mounting portion 13b form a water discharge portion 35.

Further, in the center of the cover 36, a control valve rod 39 that closes the pilot hole 19 is provided so as to penetrate the guide shaft 40 so as to limit the rise of the diaphragm valve body 11. The outer periphery of the control valve rod 39 and the inner periphery of the guide shaft 40 are threaded so that the handle 41 provided at the upper portion can rotate to move up and down. A valve body 39a is formed at the lower end of the control valve rod 39, and a valve seat 42a with which the valve body 39a abuts is formed in the pilot pipe 42 forming the pilot hole 19. Therefore, when the diaphragm valve body 11 rises, the lower end of the control valve rod 39 enters the pilot hole 19 as shown in FIG.
With the 9a in contact with the valve seat 42a, the opening of the valve is restricted. Further, a water discharge faucet 43 is fixedly provided on the guide shaft 40 so as to penetrate from the outer side thereof to a shaft hole 40a communicating with the diaphragm chamber 12. In the water supply device A having such a configuration, as shown in FIG. 1, the input port of the latch type solenoid valve 16 is connected to the water discharge faucet 21. The output port of the latch type solenoid valve 16 is open to the atmosphere.

Next, the latch type solenoid valve 32 will be described. FIG. 5 is a sectional view showing the latch type solenoid valve 32. In this configuration, a solenoid portion around which a coil 52 is wound is formed around a fixed iron core 51, and a plunger 53 having a valve body 61 formed at the tip coaxially is disposed below the fixed iron core 51. Further, an input port 55 and an output port 56 are formed in the main body 54, and both ports are communicated via a valve seat 57 formed inside the main body 54. The plunger 53 urged downward by the spring 58 is provided so as to contact the valve seat 57.
Further, a permanent magnet 59 sandwiched between magnetic members 62 and 63 is provided below the coil 53.

Next, the drainage device B and the control means Q will be described. The configuration of the drainage device B is shown in a sectional view in FIG. The drainage device B is provided with a drainage pipe main body 22 and a height adjusting pipe 21 slidably held by a guide portion 22a formed in the drainage pipe main body. Drain pipe body 22
Is embedded and fixed according to the ground surface of the paddy field S when the lower surface of the intake port 22c is dry. Further, the drainage port 22b is provided so as to communicate with the agricultural drainage channel. The height adjusting pipe 21 is fixed with a handle 20 for the farmer to move the height adjusting pipe 21 up and down. An electrode bracket 26 is fixedly attached to the handle 20. The upper limit electrode 25,
A lower limit electrode 24 and a common electrode 23 are attached.

The common electrode 23, the lower limit electrode 24, and the upper limit electrode 25 are connected to the control means Q by connection lines 27, respectively. The longest electrode is the common electrode 23, the next longest electrode is the lower limit electrode 24, and the shortest electrode is the upper limit electrode 25.
It is. In the control means Q, the water level detector 30 is connected to the three water level detection electrodes 23, 24, 25. Further, the water level detector 30 is connected to a latch circuit 31 and a power amplifier 32, and the power amplifier 32 is further connected to a coil of the latch type solenoid valve 16 via an electric wire 18.
On the other hand, a sampling time generator 33 that generates a sampling pulse is connected to the battery 28, and the sampling time generator 33 includes a power amplifier 32 and a water level detector 3.
0 is connected. The power amplifier 32 and the latch circuit 31 are directly connected to the battery 28. As the battery 28 used here, a battery such as a lithium battery that has a small spontaneous discharge and can be used for a long period of time is used.

The respective components of the paddy field automatic water supply system of the present embodiment have been described above. Next, the operation of the paddy field automatic water supply system will be described. First, the worker moves the handle 20 up and down in the drainage device B to set the upper surface of the height adjusting pipe 21 to the required water level of the paddy field S. As a result, the upper limit electrode 25, the lower limit electrode 24, and the common electrode 23 also move at the same time. At this time, the lower end of the upper limit electrode 25 is located slightly above the upper surface of the height adjusting pipe 21. Further, the lower end of the lower limit electrode 24 is located slightly below the upper surface of the height adjusting pipe 21, and the lower end of the common electrode 23 is located further below the lower limit electrode 24. Here, the position of the lower end of the upper limit electrode 25 is the height of the upper limit water level, and is the height at which the water supply of the water supply apparatus A is stopped. Further, the lower end of the lower limit electrode 24 is the height at which water supply by the water supply device A starts. Therefore, the sampling time generator 33 generates a voltage pulse as shown in FIG. 6 for each electrode placed in such a state. This timing differs depending on the size of the paddy field to which water is supplied, and is about 10 to 30 minutes (a larger paddy field allows more settings). This time is obtained by extending the sampling interval within a range that does not affect the water level. In addition, one measurement time is 0.1 to 0.2 seconds.

The operation of the paddy field automatic water supply system will be briefly described with reference to the diagram shown in FIG.
Therefore, the water level of the paddy field is detected at the above sampling interval. Therefore, when the control device Q detects that the water level of the paddy field is not filled up to the predetermined position, the opening / closing of the water supply device A is adjusted. That is, when the control device Q detects that the water level of the paddy field is lower than the lower limit water level, a signal for opening the latch type solenoid valve 16 is transmitted from the control means Q to the water supply device A through the electric wire 18. The latch type solenoid valve 16 is opened. Then, the pressure of the diaphragm chamber 22 of the water supply device A is lowered, and the diaphragm valve element 11 is opened by the pressure of the water from the water supply pipe 13 to cause the diaphragm valve body 11 to open.
The water is released to the paddy field.

On the other hand, when the control device Q detects that the water in the paddy reaches the upper limit water level, that is, when the water level in the paddy field reaches the upper limit water level, the latch type solenoid valve 16 is closed and the pressure in the diaphragm chamber 12 increases accordingly. The diaphragm valve element 11 is closed and the supply of water to the paddy fields is stopped. Furthermore, if the water level in the paddy field falls below the set value due to evaporation or the like after the elapse of time, the diaphragm valve 11 is opened again and water is supplied because the controller Q constantly detects it at the sampling interval. Hereinafter, the operation of each component of the paddy field automatic water supply system will be described in more detail.

First, the operation of the control device Q will be described with reference to FIG. In the control device Q, the sampling time generator 33 is always in a movable state by the battery 28. Therefore, the sampling time generator 33 continues to generate pulses at predetermined sampling intervals, and the water level of the paddy field is constantly detected. Therefore, for example, as shown in the time chart of FIG. 6, when the pulse A-1 is applied to the water level detector 30 and the water in the paddy field is below the lower limit water level, the lower limit electrode 24 and the common electrode 23 are The electric resistance with
-1 is output. This signal is input to the latch circuit 31, where it is temporarily stored as a signal indicating that the water level in the paddy field is below the lower limit water level.

Further, this signal is inputted to the power amplifier 32, and after being amplified there, the driving pulse D-1 is given as a positive signal to the latch type solenoid valve 16 via the electric wire 18.
Is transmitted and the latch type solenoid valve 16 is driven. The driving of the latch type solenoid valve 16 and the diaphragm valve body 11 will be described later. Then, at the next sampling time, pulse A
-2 is applied. At this time, if the water level is still below the lower limit water level, the signal in such a state has already been stored in the latch circuit 31 by the previous sampling, and therefore no signal is output to the power amplifier 32.
Therefore, the drive pulse is not applied to the latch type solenoid valve 16 as shown in FIG. 6, and the state based on the previous signal is continued.

Next, when the timing pulse is applied when the water level of the paddy field rises between the lower limit water level and the upper limit water level, the resistance between the lower limit electrode 24 and the common electrode 23 becomes the water resistance (10 to 30K). ). However, when the timing pulse A-m (m is arbitrary) is applied, an infinite electric resistance between the upper limit electrode 25 and the common electrode 23 is detected by the water level detector 30. When the resistance between the lower limit electrode 24 and the common electrode 23 is water resistance and the resistance between the lower limit electrode 24 and the common electrode 23 is infinite, the water level detector 30 transfers to the latch circuit 31. No detection signal is output. Therefore, the drive pulse is not applied to the latch type solenoid valve 16 and the state based on the previous signal is continued.

After a predetermined time, when the timing pulse A-n (n is arbitrary, but m <n) is applied and the water level of the paddy field exceeds the upper limit water level, the upper limit electrode 25,
The resistance between the common electrodes 23 is infinite to the water resistance (10-3
0K). Therefore, this is detected by the water level detector 30, and the upper limit signal C-n is input to the latch circuit 31. In the latch circuit 31, the upper limit signal is temporarily stored in place of the previously stored lower limit signal as a signal indicating that the water level of the paddy field exceeds the upper limit water level. Then, this signal is input to the power amplifier 32, and after being amplified there, the latch type solenoid valve 16 is passed through the electric wire 18.
A driving pulse D-n is output as a negative signal to the latch type solenoid valve 16 and the pilot water is stopped.

Next, the driving of the latch type solenoid valve 16 in which the detection signal is input through the electric wire 18 as described above will be described with reference to FIG. The positive drive signal (for example, D-1 in FIG. 6) from the power amplifier 32 is applied to the latch type solenoid valve 1.
6 is input. That is, in the latch type solenoid valve 16, a positive voltage is applied to the coil 52 via the electric wire 18.
Then, a magnetic field is generated in the coil 52, and this magnetic field and the magnetic field direction of the permanent magnet 59 built in the latch type solenoid valve 16 match, so that the plunger 59 moves upward against the spring 58 biased downward. Is sucked into. Therefore, the valve body 61 at the lower end of the plunger 59 has hitherto abutted against the valve seat 57 to shut off the flow path. However, when the plunger 59 rises, the valve is opened and the fluid flows from the input port 55 to the output port 56. Become. Further, as described above, the drive signal is applied only once, but after applying the pulse, the permanent magnet 5 is applied.
The plunger 53 is maintained in the raised state by the magnetic force of 9. On the other hand, when a negative drive signal (eg, Dn in FIG. 6) is applied to the latch type solenoid valve 16, the magnetic field generated in the built-in coil 52 and the magnetic field of the permanent magnet 59 repel each other, As a result, it is released from both magnetic forces,
The spring 58 biases the valve body 61 downward to abut the valve seat 57 to block the flow path.

Next, regarding the operation of the diaphragm valve body 11 controlled by opening and closing the latch type solenoid valve 16,
This will be described with reference to FIGS. 3 and 4. First, when the latch type solenoid valve 16 is closed, the water flowing from the water supply pipe 13 into the diaphragm valve body 11 moves up the flow dividing pipe 13a, flows into the pilot hole 19, and is filled in the diaphragm chamber 12. Further, the diaphragm chamber 12 is communicated with the latch type solenoid valve 16 through the water discharge faucet 43, but since the latch type solenoid valve 16 is closed, water is filled in these portions and does not flow. Still, since water is continuously supplied to the water supply pipe 13, water pressure is applied to the diaphragm valve body 11. Therefore, a large force is applied downward from the upper surface of the diaphragm valve body 11 having a large water pressure area, so that the diaphragm valve body 11 and the valve seat 34 come into contact with each other, and water is not discharged to the outside.

When a positive signal is applied to the latch type solenoid valve 16 and the plunger 53 is lifted and opened, the input port 55 and the output port 56 communicate with each other. Then, since the input port 55 is communicated with the diaphragm chamber 12, the water in the diaphragm chamber 12 flows into the latch type solenoid valve 16 and is further discharged to the paddy field. The latch type solenoid valve 16
Since the orifice diameter is larger than the pilot hole 19, the discharge is larger than the flow into the pilot hole 19. On the other hand, the pressure in the diaphragm chamber 12 decreases due to the water flowing out of the diaphragm chamber 12. Therefore, the water rising from the water supply pipe 13 to the diversion pipe 13a is against the downward biasing force of the return spring 14 due to the pressure. The body 11 is pushed up, and water is supplied to the paddy field from the water discharge part 35 that opens.

By the way, the water discharge faucet 43 shuts off the water passage so that water does not flow to the latch type solenoid valve 16 when not in use. Further, the control valve rod 39 adjusts the height of the valve body 39a at the tip thereof by rotating the handle 41. Therefore, when the position of the valve body 39a is changed, it abuts on the valve seat 42a formed with the pilot pipe 42, the opening of the valve is adjusted, and the amount of discharged water is adjusted. By the way, when a negative voltage pulse is applied to the latch-type solenoid valve 16 and 61 abuts against the valve seat 57 to shut off the valve,
While the water in the diaphragm chamber 12 does not flow anywhere,
Since water flows in from the pilot hole 19, the diaphragm chamber 12 is filled with water. Therefore, the diaphragm valve body 11 is again brought into contact with the valve seat 34 and the water supply is stopped.

As described above, according to the paddy field automatic water supply system of the present embodiment, the drainage device B applies a plurality of electrodes 24, 25, 26 movable up and down with respect to the water surface and a pulse to the electrodes at predetermined intervals. Since the control means Q controls the opening and closing of the diaphragm valve body 11 by applying the water level to detect the water level, it is not necessary to perform a mechanical operation of the float 105 or the like, and therefore the grass floating in the paddy field S. There is no risk of malfunction due to dust or dirt getting caught, or inability to operate due to non-use for a long period of time, the amount of water drained downstream can be reduced, and the problem of pesticides and fertilizers flowing into rivers is solved. To be done. Further, since the electrode mounting space is as small as 12 cm ² and it can be installed in the drainage device B, there is an advantage that it does not interfere with agricultural work. Therefore, it can be widely used from small rice fields to large rice fields.

Further, the water supply device A is the diaphragm valve body 1
1 has a pilot-type latch-type solenoid valve 16 for opening and closing 1, and the control means Q controls the opening and closing of the latch-type solenoid valve 16, so the power consumption of the paddy field automatic water supply system can be reduced. Further, the latch-type solenoid valve 16 moves into the coil 52, which is wound into a tubular shape, the valve seat 57 which connects the two ports, the fixed iron core 51 which is arranged at the center of one end of the coil 52, and the coil 52. A valve seat 57 is provided so that it is possible.
Since the plunger 53 having the valve body 61 that abuts on the coil 53 and the permanent magnet 59 whose both surfaces are sandwiched by the magnetic members are disposed at the other end of the coil 52, the power consumption of the paddy field automatic water supply system can be reduced. it can.

Here, in the paddy field in which the paddy field automatic water supply system of this embodiment is used, it takes half a day to one day to fill the water with a large area, and it takes 2 to 5 to drop the water level from the upper limit to the lower limit. It is a situation that takes days. Utilizing such a property, the sampling time for detecting the water level is set to 10 to 30 minutes in the above embodiment, and the measurement time is set to 0.
Since it is as short as 1 to 0.2 seconds, the service life of the lithium battery with less spontaneous discharge is further extended, and the system can be operated for 5 years or more with one battery. Further, in the present embodiment, no mechanical structure such as a conventional float is provided on the detector side, so that damage and the like hardly occur and the whole system becomes compact.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. For example, in this embodiment, the battery 28 is used as the power source, but a solar power source that uses solar energy may be used.
Further, for example, in the present embodiment, the one in which three electrodes are used is shown, but more electrodes may be used so that a plurality of water levels can be set. That is, with respect to the required water level that changes to suit the growth of rice, it is possible to set the water level to be adjusted to match the growing season. Therefore, in such a case, the circuit configuration of the control unit of the above embodiment can be sequentially changed. Further, although the latch type solenoid valve is used as the self-holding type solenoid valve in the present embodiment, the same is true even if another mechanical type is used.

[0038]

As described above, according to the paddy field automatic water supply system of the present invention, the drainage device applies a pulse to the plurality of electrodes that can move vertically with respect to the water surface and the electrodes at predetermined intervals to change the water level. Since it has a control means to detect and control the opening and closing of the main water supply valve, it is not necessary to perform a mechanical operation such as a float, so grass and dust floating in the paddy fields are caught and malfunctions occur. It is possible to reduce the amount of water to be drowned downstream without the risk of causing it or inoperability due to non-use for a long time, and to solve the problem of drooling pesticides and fertilizers into rivers. Further, since the electrode mounting space is small and the electrode can be installed in the drainage device B, there is an advantage that it does not disturb the agricultural work. Therefore, it can be widely used from small rice fields to large rice fields.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the configuration of a paddy field automatic water supply system that is an embodiment of the present invention.

2 is a cross-sectional view showing the configuration of a drainage device B. FIG.

3 is a cross-sectional view showing a closed state of the diaphragm valve body 11 in the water supply device A. FIG.

4 is a cross-sectional view showing a valve open state of the diaphragm valve body 11 in the water supply device A. FIG.

FIG. 5 is a cross-sectional view showing a configuration of a latch type solenoid valve 16.

FIG. 6 is a diagram showing a time chart of the paddy field automatic water supply system.

FIG. 7 is a conceptual diagram showing a conventional paddy field automatic water supply system.

[Explanation of symbols]

 A Water supply device B Drainage device Q Control means S Paddy field 11 Diaphragm valve body 12 Diaphragm chamber 13 Water supply pipe 16 Latch type solenoid valve 18 Electric wire 19 Pilot hole 21 Height adjustment pipe 24 Lower limit electrode 25 Upper limit electrode 26 Electrode bracket 30 Water level detector 31 Latch circuit 32 Power amplifier 33 Sampling time generator

Claims (5)

[Claims] 1. A water supply device comprising a water supply main valve for supplying or shutting off water supplied from a supply source to a paddy field, and water having a water level above the predetermined level when the water level in the paddy field reaches or exceeds the predetermined level. In a paddy field automatic water supply system having a drainage device that discharges water, the drainage device detects a water level by applying a pulse to the electrodes at a predetermined interval timing and a plurality of electrodes that can move up and down with respect to the water surface. A paddy field automatic water supply system comprising: a control unit that controls opening and closing of the main water supply valve. 2. The paddy field automatic water supply system according to claim 1, wherein the water supply device has a pilot-type self-holding solenoid valve for opening and closing the water supply main valve, and the control means is the self-holding device. Paddy field automatic water supply system characterized by controlling the opening and closing of a solenoid valve. 3. The automatic paddy water supply system according to claim 2, wherein the main water supply valve is a valve seat formed on an extension of a pipe communicating with a water supply pipe for supplying water, and an upper part of the valve seat. A diaphragm valve body that abuts against the valve body to block the discharge of water; a pilot port that communicates the diaphragm chamber formed in the upper part of the diaphragm valve body with the pipe; and a discharge port formed around the valve seat, An automatic paddy water supply system comprising: a diaphragm chamber and a communication hole that communicates with a tube that communicates with the self-holding solenoid valve. 4. The paddy field automatic water supply system according to claim 2, wherein the self-holding solenoid valve has a coil wound in a tubular shape, a valve seat communicating two ports, and a center portion of the one end of the coil. A fixed iron core provided, a plunger having a valve body movably provided in the coil and abutting on the valve seat, and a permanent magnet having both surfaces sandwiched by magnetic members at the other end of the coil are arranged. A paddy field automatic water supply system characterized by being installed. 5. The paddy field automatic water supply system according to claim 2, wherein the control unit drives a battery, a sampling pulse generator that emits pulse signals at predetermined intervals, and a pulse from the sampling pulse generator. A voltage is applied to the plurality of electrodes by a signal, the water level is detected by energization when a predetermined electrode is in contact with water, and the detected detection signal is output as a pulse for driving the self-holding solenoid valve. A paddy field automatic water supply system having a detector.