JPH0965777A - Water supply system for paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water in a paddy field from back flow to an irrigation canal for the paddy field even when the paddy field is in a area of the same water level as that of the irrigation canal, and to make water supply capable of being promptly started at the time of start of an irrigation. SOLUTION: The objective water supply system is constructed as a paddy field water supply system that controls the water level in a paddy field by compressing a water supply route 4 which causes the irrigation canal 2 to communicate with a paddy field 1 and is composed of a flexible material, with a shutoff mechanism 5 closing the water supply route 4, and by releasing the water supply route 4 from compression with the shutoff mechanism 5 opening the water supply route 4 so that water supply into the paddy field is started and stopped; and this system also has a check valve 8 located in the middle 4 of the irrigation canal 2, thereby preventing irrigation water from flowing back from a paddy field 1 to the irrigation canal 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field water supply system for controlling the water level of a paddy field, and in particular, the water supply channel communicating between the canal and the paddy field is made of a soft material, and the water supply channel is crushed by an opening / closing mechanism. Paddy field that closes or releases the closed state to supply the water in the irrigation canal to the paddy field, or stops the water supply when the water level of the paddy reaches a preset water level and manages the water level of the paddy field Water supply device.

[0002]

2. Description of the Related Art A water supply device for paddy fields of this type is known and disclosed, for example, in Japanese Patent Application Laid-Open No. 57-51319. This conventional device, in a cylinder made of a hard member, connects the water channel and the paddy field with a water supply channel made of a soft material made of a film inserted and inserted in a state of being fixed to the openings at both ends of the cylinder, thereby connecting the water channel to the paddy field. On the outside, a water supply / stop signal output from the water level detector of the paddy field causes a water supply / stop signal to crush the water supply channel to close the flow of the water channel or to release the closed state. An opening / closing mechanism is provided to supply water from the irrigation canal to the paddy field, or to stop the water supply to control the water level in the paddy field.

[0003]

The water flowing through the irrigation canal (irrigation water) is natural water such as river water, so the water level is not always constant but changes daily. Therefore, in the height difference between the irrigation canal and the paddy field,
Water is supplied to the paddy fields so that the water falls. In other words, if the irrigation canal is higher than the paddy field, there will be no problem,
There is no difference in the height of water falling between the irrigation canal and the paddy field, and the irrigation canals are in the same level relationship (see Figure 1).
In the case, the water level in the paddy falls below the set water level, and the water supply channel is closed by the opening / closing mechanism that is automatically controlled by the water supply signal output from the water level detector (the water supply channel close release signal). When the state is released, the water in the paddy field may flow back to the irrigation canal side. In addition, after the water supply passage made of a soft material of the conventional device is released from the closed state by the opening / closing mechanism, it is opened along the inner circumference of the tubular body with the force of water flowing from the water supply passage to supply water to the paddy field. Since it starts, there is a problem that it takes time until the water supply to the paddy starts after the closed state by the opening / closing mechanism is released.Therefore, the water level detector sends the water stop signal (water supply channel). The closing time signal) is output and the time required for the water level to rise to the set water level is prolonged.

The present invention has been made in view of such conventional circumstances, and the purpose thereof is to make the water of the paddy field flow backward to the irrigation canal side even in the paddy field in an area where the irrigation canals have substantially the same level relationship. It is not to do so, and to provide a paddy field water supply device that starts water supply at the beginning of water supply.

[0005]

In order to achieve the above object, the present invention is to crush the water supply channel made of a soft material that connects the irrigation channel and the paddy field with an opening / closing mechanism to close the flow of the water channel. In the paddy water supply device that releases the closed state and opens the water supply channel to supply water to the paddy field or to control the water level of the paddy field when the water supply is stopped, in the middle of the water channel, A check valve is installed to prevent backflow from the side to the side of the waterway. According to such a technical means, in a paddy field in an area where the irrigation canals have substantially the same level relationship and the water level of the irrigation canal is lower than the water level of the paddy field, the water supply signal output from the water level detector (water supply canal Signal of closing closure)
The open / close mechanism is operated under the control of, and even if the closed state of the water supply channel is released, the water in the paddy field is stopped by the check valve.

Further, the water supply passage is formed by using a soft member having high elasticity. According to such technical means, when the closed state by the opening / closing mechanism is released, the water supply channel is quickly restored to the original shape (cylindrical) before being crushed by its own elastic action, and the water supply channel is restored. The open state of is a fully open state that allows water in the irrigation canal to quickly flow to the paddy field side.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Specific examples of the implementation of the water supply system for paddy fields of the present invention will be described below with reference to the drawings. It is placed in the machine frame 3 that is supported by the pillars 18 etc. and installed in the paddy field 1, and
And an opening / closing mechanism 5 that crushes the water supply channel 4 made of a soft material that connects the paddy field 1 and the circulation of the water supply channel 4 or releases the closed state, and a position on the side of the opening / closing mechanism 5. disposed, the water level detector 6 for electrically detecting the water level L ₁ of paddy 1, performs a comparison between the level L ₁ and set water level being output from the level detector 6 (upper level) A control unit 7 for controlling the movement of the opening / closing mechanism 5 based on the comparison contents, and the control unit 7 determines that the water level L ₁ output from the water level detector 6 is lower than the set water level, A water supply signal from the control unit 7 to a later-described motor 5-1 of the opening / closing mechanism 5 (a signal for releasing the closing of the water supply passage 4)
Is output, the closed state of the water supply passage 4 by the shutter 5-2 of the opening / closing mechanism 5 described later is released, and water supply is started. When the water level L ₁ that rises with the water supply reaches the set water level, the control unit 7 outputs a water supply stop signal (a signal for closing the water supply passage 4) to the motor 5-1 and the shutter 5-2 causes the water supply passage 4 to stop. The second passage 4-2, which will be described later, is crushed, the water supply passage 4 is closed, and the water supply is stopped. Further, a check valve 8 is arranged in the middle of the water supply passage 4 so that the water in the paddy field 1 does not flow back to the irrigation passage 2 side.

The opening / closing mechanism 5 is operated by the water supply / stop signal output from the control unit 7, and the second water supply passage 4 is operated.
The passage 4-2 is crushed to close the flow of the water supply passage 4 or to release the closed state. The water supply / stop signal output from the control unit 7 causes normal rotation /
A motor 5-1 that reversely moves to move the rod 9 up and down and a shutter 5-2 that is fixedly supported by the tip of the rod 9 of the motor 5-1 and crushes the water supply passage 4 from above.
The motor 5-1 rotates normally or reversely to raise and lower the shutter 5-2, crush the second passage 4-2 of the water supply passage 4 which will be described later, and close the flow of the water supply passage 4, The water supply from the irrigation channel 2 to the paddy field 1 is stopped or the closed state is released so that the water in the irrigation channel 2 is supplied to the paddy field 1. The shutter 5-2 is arranged so as to vertically move vertically by being guided by the left and right guide plates 10 standing on both sides of the water supply passage 4 so as to sandwich the water supply passage 4, and the second passage 4-2 of the water supply passage 4 is provided. The second passage 4-2 can be crushed by a receiving seat 11 made of hard rubber or a metal plate disposed on the lower side of the second passage 4-2.

The water level detector 6 is a pressure sensor that converts a change in pressure (water pressure) corresponding to the vertical displacement of the water level L ₁ into a voltage and outputs the water level L ₁ to the control section 7. Yes, it is arranged vertically in the machine casing 3 and the control unit 7
And is configured to output the detected water level information to the control unit 7. In the figure, the detection part 6-1 is projected into the sensor box 14 which is fixed to the lower end of the vertical pipe 12 which is vertically installed in the machine frame 3 and is immersed in the recess 13 provided in the rice field 1-1 of the paddy field 1. Paddy field 1
The water level L ₁ of the above can be detected.

The control unit 7 compares the water level L ₁ output from the water level detector 6 with the set water level. That is, when it is determined that the water level L ₁ output from the water level detector 3 is lower than the set water level, a water supply signal is output to the motor 5-1 of the opening / closing mechanism 5 and the water level L ₁ reaches the set water level. To output a water stop signal to motor 5-1. That forms a role already managed to set the water level L ₁ of paddy 1 level by comparison with the current water level coming outputted the water level L ₁ of paddy 1 based on the set water level stored from the water level detector 6 It is arranged in a box 16 on the machine casing 2 in which the battery 15 is installed.

Incidentally, in this embodiment, when the control unit 7 compares the water level L ₁ with the set water level, the water level difference between the set water level and the water level L ₁ is up to ± 2 cm. For example, 15
Even if the water level L ₁ output from the water level detector 6 is 13 cm and 17 cm with respect to the set water level of cm, the control unit 7 compares the set water level and the current water level with the same water level.

The water supply channel 4 is directly connected to the irrigation channel 2 to form a paddy field 1.
The first passage 4-1 made of a hard member facing the pipe and the first passage 4-1 are connected via the check valve 8 to the machine casing 3
The shutter 5-2 of the opening / closing mechanism 5 is composed of a second passage 4-2 made of a soft elastic material such as silicon rubber or urethane rubber, which faces the pipe in a position below the opening / closing mechanism 5.
In the state where the closed state (crushed state) of the second passage 4-2 is released and the second passage 4-2 is opened, the water in the irrigation canal 2 is used for the first passage 4-1 and the check valve 8 to be described later. Connection
Water is supplied to paddy 1 through 8-1 and the second passage 4-2.

The check valve 8 has no difference in height between the irrigation canal 2 and the paddy field 1, and the water level L2 of the irrigation canal 1 is output from the water level detector 6 of the paddy field 1 to the control section 7. L
_When the water level L ₁ is lower than ₁ , and the water level L ₁ is lower than the set water level, the control unit 7 determines that the water supply signal is output to the motor 5-1 of the opening / closing mechanism 5 and the shutter 5-2 opens the water supply path 4. It serves to stop the reverse flow of water from the paddy field 1 to the irrigation channel 2 side that occurs when the closed state of the second channel 4-2 is released. That is, the second passage of the water supply passage 4 by the shutter 5-2
When the water level L _{2 of the} irrigation canal 1 is lower than the water level L _{1 of the} paddy 1 when the closed state of 4-2 is released, it functions to stop the reverse flow of water from the paddy 1 to the irrigation canal 2 side. Four
Connection port 8-to connect the first passage 4-1 and the second passage 4-2 of
1 and inside this connection port 8-1 with the upper pivot point as the fulcrum
The valve can be opened from passage 4-1 to the side of the second passage 4-2.
From the passage 4-2 to the first passage 4-1 side, the valve body 8-2 is installed so as to be closed. That is, an annular seal 17 for preventing the valve body 8-2 from opening to the side of the first passage 4-1 is attached to the inner surface of the connection port 8-1, so that the valve body 8-2 can be connected to the second passage 4-. It is configured to open the valve only on the 2 side.

Next, an operation example of the water supply system for a paddy field according to the present embodiment having the above-mentioned structure will be described.
The water level L _{1 of} is detected. When the detected water level L ₁ information is output to the control unit 7, the control unit 6 performs a comparison process between the water level L ₁ and the set water level at the time when the water level detector 6 outputs the water level information. When it is determined that the water level L ₁ is lower than the set water level, a water supply signal is output to the motor 5-1 of the opening / closing mechanism 5, the motor 5-1 is operated in the forward or reverse direction to raise the rod 9, and the shutter 5- 2 for the second of the water supply channel 4
The second passage 4-2 is released from the passage 4-2 to release the closed state of the second passage 4-2. Then, the second passage 4-2 is immediately restored to the cylindrical shape before being crushed by its own elastic action, and the water in the irrigation canal 2 is in a fully opened state in which it is quickly supplied to the paddy field 1 (state of FIG. 2). ). At this time, the water level L _{2 of the} canal 2 is the water level L _{1 of the} paddy field _1.
When the water in the paddy field 1 flows backward toward the irrigation canal 2 side, the valve body 8-2 of the check valve 8 closes and stops the flow (state of the chain double-dashed line in FIG. 2). As the water level L ₁ reaches the set water level by the rise in the water level L ₁ due to the start of the water supply to the paddy field 1, the water supply stop signal is output from the control unit 7 to the motor 5-1, a motor 5-1 reverse or forward Direction, the rod 9 is lowered, the shutter 5-1 is brought into contact with the second passage 4-2 of the water supply passage 4, and the second passage 4-2 is crushed to close the flow of the water supply passage 4. , Stop the water supply (state of Figure 1).

FIGS. 3 to 5 show the configuration of the opening / closing mechanism 19 for crushing and closing the second passage 4-2 made of a soft member having high elasticity in the water supply passage 4 described in the above embodiment and releasing the closed state. Another embodiment of the water supply device for paddy field in which the configuration of the water level detector 20 for detecting the water level L _{1 in the} paddy field 1 is changed will be described. In such an embodiment, the same reference numerals are used for the same components as those in the detailed description of the above embodiment, and the description thereof will be omitted.

The opening / closing mechanism 19 includes a weight 19-1 for crushing the second passage 4-2 of the water supply passage 4, a wire 19-2 for hanging the weight 19-1 and a wire 19-2 for winding the wire 19-2. A speed reducer 19 having a wire take-up shaft 19-4 on the upper surface of the motor 19-3, which serves as a drive unit for hoisting down, and the motor 19-3 is covered by a cover 22 of a machine frame 21 supported by columns 18 or the like. It is connected to -5 and installed. Then, the wire 19-2 is guided from the notch 23 provided on the upper surface of the machine frame 21 to the upper surface, and one end thereof is fixedly wound around the wire winding shaft 19-4, and the normal rotation of the motor 19-3 is performed. Alternatively, the weight 19-1 is moved up and down by winding and lowering the wire 19-2 by reversing. That is,
The weight 19-1 crushes and closes the second passage 4-2 so that the closed state can be released. The weight 19-1 is in the second passage 4-
It is formed into a cylindrical shape having an appropriate thickness by the weight for crushing 2. Then, the left and right side plates 24 of the machine frame 21 that sandwich the second passage 4-2.
The wire 19-2 is arranged so as to be vertically moved by being guided by the both side plates 24, and is fixedly hung on the other end side of the wire 19-2. In the figure
25 is the weight of the upper surface shape arranged on the lower side of the second passage 4-2.
-1 is a half-moon shaped receiving seat that matches the outline of the
When 19-1 is hung, this receiving seat 25 crushes the second passage 4-2 to close the water supply passage 4 (see FIG. 3).

In the figure, reference numerals 26 and 27 denote a second passage 4-by a weight 19-1.
This is a limit switch for detecting the opening / closing of the water supply channel 4, which serves to stop the movement of the motor 19-3 when the 2 is crushed and closed, and when the closed state is released. The switch 26 is provided on the upper surface of the machine frame 21 in the vicinity of the opening of the notch 23 for the wire 19-2, and the swing actuator 26-1 is hung from the notch 23 into the machine frame 21 to provide the second passage. By being pushed up by the weight 19-1 that has been wound up to the point when the closed state of 4-2 is completely released, it is turned on or off and the operation stop signal is output to the motor 19-3. On the other hand, the limit switch 27 for closing detection is arranged between the wire guide shaft 19-6 and the wire winding shaft 19-4 which are arranged in a bridge so as to stride over the notch 23 on the upper surface of the machine frame 21. The swing actuator 27-1 is connected to the guide shaft 19-6 and the take-up shaft 19-4.
By contacting the wire 19-2 between and, the weight 19-1 is unwound until the second passage 4-2 is crushed and completely closed, and the tension of the wire 19-2 is loosened. , ON or
It is designed to be turned off and output an operation stop signal to the motor 19-3.

The water level detector 20 includes a float 20-1, a detection panel 20-3 attached to the upper end of the float shaft 20-2, and a water level upper limit /
It consists of limit switches 20-4 and 20-5 for the lower limit.

The float 20-1 is sized so that the float 20-1 can be installed in a flat horizontal oblong rectangular tubular body 28 in which the paddy field 1 is installed by being supported by a support 18 using an appropriate member having a low specific gravity. Form and attach to the lower end of the float shaft 20-2. A plurality of vertically long flowing water holes 29 are formed around the cylindrical body 28 at appropriate intervals so that the water of the paddy field 1 can flow in. Further, at the center of the inside of the tubular body 28, a support body 30 for supporting the float shaft 20-2 in a vertically loose fitting manner is provided.
Is formed so as to be vertically movable. Reference numeral 31 in the figure denotes a battery box in which a battery, a dry cell or the like is housed.

[20] Limit switch for upper and lower water level 20-
4, 20-5 are cylindrical bodies 28 located on the sides of the float shaft 20-2.
Support shaft that is vertically arranged inside and has a water level scale
It is supported so that it can be displaced up and down by the knob 33 operation on the 32, and the water level L
_The detection panel 20-3, which moves up and down with the movement of the float 20-1 due to the fluctuation of ₁ , makes the switch ON or OFF to output the upper and lower limit signals of the water level L ₁ to the motor 19-3. That is, the water supply / stop signal is output to the motor 19-3.

Next, the operation of the paddy water supply system of the present embodiment constructed as above will be described. The water level L _{1 of the} paddy ₁ is lowered, the float 20-1 is lowered, and the detection plate 20-3 is used for the lower limit. When the limit switch 20-5 of the
A water supply signal is output to 19-3, the motor 19-3 is operated in the forward or reverse direction to wind the wire 19-2, and the weight 19
-1 is detached from the second passage 4-2 of the water supply passage 4 to release the closed state of the water supply passage 4 (state in FIG. 4). At this time, the weight 19-1
Is the swing actuator for the limit switch 26 for open detection.
Push up 26-1. Then, the limit switch 26 is turned on or off to output an operation stop signal to the motor 19-3 to stop the motor 19-3. The second passage 4-2 is restored to the cylindrical shape immediately before being crushed by its own elastic action, and the water in the irrigation canal 2 is quickly supplied to the paddy field 1 to be in a fully opened state and the automatic water supply to the paddy field 1 is performed. Will start. At this time, when the water level L _{2 of the} irrigation channel 2 is lower than the water level L _{1 of} the paddy field 1 and the water of the paddy field 1 flows backward toward the irrigation channel 2 side, the valve body 8-2 of the check valve 8 closes the valve. Stop the flow (state of the chain double-dashed line in Fig. 4). The float 20-1 rises due to the rise of the water level L ₁ accompanying the start of water supply to the paddy 1, and the detection panel 20-3 comes into contact with the upper limit switch 20-4. That is, when the water level L _{1 of the} paddy field 1 reaches the set water level, a water stop signal is output from the limit switch 20-4 to the motor 19-3 of the opening / closing mechanism 19, and the motor 19-3 operates in the reverse or forward direction. At least wire 19-2
Unwind. Then, the second passage 4-2 of the water supply passage 4 has a weight.
19-1 is crushed and the distribution of the water supply channel 4 is closed, and the water supply is stopped. At this time, the tension of the wire 19-2 is loosened, the limit switch 27 for detection of closing is turned on or off, and an operation stop signal is output to the motor 19-3 to stop the motor 19-3 (state of FIG. 3). .

[0022]

The water supply apparatus for paddy fields of the present invention is constructed as described above, and has the following effects. . When the water level L _{1 of the} paddy field drops, the closed state of the water supply channel made of soft material is released to supply the water in the irrigation channel to the paddy field, and when the water level L ₁ reaches the set water level, the water channel is opened and closed by the opening / closing mechanism. These movements of crushing and closing the distribution of the water supply channel to stop the water supply can control the water level of the paddy field, as well as the water level of the water channel in the paddy field in the areas where the water channels are at approximately the same level. L ₂ is at lower than the water level L ₁ of paddy lowers the water level L ₁ of the paddy, is stopped by the reverse flow check valve from paddy side to irrigation canals side by the closed state of the water supply passage is released by opening and closing mechanism .

[0023] When the closed state of the water supply channel by the opening / closing mechanism is released as described above, the water supply channel consisting of a flexible elastic member quickly returns to its original shape (cylindrical) before being crushed by its own elastic action. After being restored, the open state of the water supply channel will be a fully open state that allows the water in the irrigation channel to quickly flow to the paddy field.

Therefore, according to the paddy field water supply apparatus of the present invention, even in a paddy field in an area where the irrigation channels have a substantially same level relationship, unlike the conventional water supply apparatus, the water in the paddy field does not flow back to the irrigation channel side. Absent. Moreover, the opening state of the water supply passage is immediately fully opened when the closed state by the opening / closing mechanism is released, so that the water supply operation starts at the same time as the water supply operation. Therefore, the time required for the water level L _{1 of the} paddy field to rise to the set water level from the start of water supply is shorter than that of the conventional water supply device.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional front view of a water supply device for a paddy field of the present invention installed in a paddy field.

FIG. 2 is a front view of the same section in a state where the closed state of the water supply channel is released and automatic water supply is started.

FIG. 3 is a vertical cross-sectional side view of the paddy water supply system of the present invention showing another embodiment.

FIG. 4 is a vertical cross-sectional front view of the state where the closed state of the water supply channel is released and automatic water supply is started.

5 is a cross-sectional view taken along the line VV of FIG.

[Explanation of symbols]

 1 ... Paddy field 2 ... Irrigation canal 4 ... Water supply channel 4-1 ... First passage 4-2 ... Second passage 5,19 ... Opening / closing mechanism 6 ... Water level detector 8 ... Check valve 8-1 ... Connection port 8-2 … Valve

Claims (2)

[Claims] 1. A water supply channel made of a soft material that connects the water channel and the paddy field is crushed by an opening / closing mechanism to close the water channel, or the closed state is released to supply the water from the water channel to the paddy field. In a water supply device for a paddy field that controls the water level of a paddy field by stopping the water supply, a check valve for preventing backflow from the paddy field side to the irrigation channel side is provided in the middle of the water supply channel. Water supply device. 2. The water supply system for paddy fields according to claim 1, wherein the water supply channel is formed by a soft member having high elasticity.