JP7187297B2 - Water tap, field water level control device and field management device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hydrant, an agricultural field water level control device, and an agricultural field management device.

Patent Literature 1 discloses a water tap and a drain tap provided with an electric field actuator that operates a displacement mechanism for controlling water supply to or drainage from a field. By using these water taps and drain taps, it becomes possible to remotely control water supply to and drainage from fields via a cloud server or the like.

For this reason, a water level sensor is provided in the field, and the water tap and the drain tap are controlled based on the water level detected by the water level sensor.

The water tap described above includes a valve mechanism having a seal member between the valve seat and the valve body, an actuator for adjusting the relative positions of the valve seat and the valve body, and a water supply control section for controlling the actuator. It is configured.

When the water level sensor detects that the water level in the field has reached a predetermined level, the actuator is driven to prevent the water in the water supply pipe from leaking out from the hydrant into the field. is pressed against the valve seat with a predetermined pressing force.

JP 2017-193914 A

However, when the field needs to be flooded, every time the water level drops due to a decrease in water depth, etc., the valve mechanism that is in the water stop state is opened to guide the water to the field, and when the water level reaches a predetermined level, the actuator is driven again. Since the operation to maintain the water stop state is repeated, there is a problem that the deterioration of the seal member and the actuator progresses, shortening the service life.

In addition, since a storage battery equipped with a charging mechanism using a solar panel is used as a power source for driving the motor used as the actuator, there is also the problem that the storage battery is exhausted if the valve mechanism is repeatedly opened and closed frequently.

In particular, a large current flows when the motor is driven against a large reaction force applied to the motor when the sealing member provided on the valve body is pressed against the valve seat to stop water flow, and the storage battery is rapidly consumed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydrant, a field water level management device, and a field management device that can suppress deterioration of a seal member and an actuator that constitute a valve mechanism in view of the above-described problems.

In order to achieve the above-mentioned object, the first characteristic configuration of the water faucet according to the present invention is a valve mechanism having a seal member between a valve seat and a valve body, and a relative position of the valve seat and the valve body. an actuator to be adjusted, a water supply control unit that controls the actuator, a wireless communication unit that connects the water supply control unit and an external device that manages a field, and supplies power to the actuator, the water supply control unit, and the wireless communication unit. and a storage battery, and a water tap that guides water to a field through a water conduit, wherein the water supply control unit is configured to control the valve based on a water supply instruction from the external device via the wireless communication unit The water supply control unit sets the relative position of the valve seat and the valve body to a valve open state in a water supply state until the field water level reaches a target water level during flooding. , the relative position of the valve seat and the valve body after the field water level reaches the target water level, pressing the valve body against the valve seat with a predetermined pressure and compressing the seal member to completely stop the water. Unlike the water stop relative position at the time, the seal member is compressed at a pressure lower than the predetermined pressure, or the water retention relative position is set to allow slight water leakage without compressing the seal member. The point is that it is configured to

The water supply control unit sets the relative position of the valve seat and the valve element to the water stop relative position so that the irrigation water in the water supply pipe does not leak into the field from the hydrant when the water is drained from the field. is pressed against the valve seat at a predetermined pressure to compress the seal member sandwiched between the valve body and the valve seat, thereby increasing the water stopping power due to the large elastic restoring force generated.

On the other hand, when flooding a field, the relative position of the valve seat and the valve body is set to the valve open state, water is supplied, and after the field water level reaches the target water level, the relative position of the valve seat and the valve body is stopped. The valve body is pressed against the valve seat at a water retention relative position different from the water relative position, for example, a pressure lower than the pressure at the water stop relative position to slightly compress the sealing member sandwiched between the valve body and the valve seat, or , the relative positions are such that the seals are not compressed and allow slight water leakage.

If the relative positions of the valve seat and the valve body are set to the water retention relative position to stop water when flooded, even if the irrigation water leaks into the field, the irrigation water will not overflow from the field. Even when the water level drops due to the effects of low water depth in the field and the valve mechanism needs to be opened and closed repeatedly, a large pressing force is not repeatedly applied to the seal members, etc., so deterioration of the seal members is minimized. can be suppressed.

Furthermore, by providing a wireless communication unit and communicably connecting the water supply control unit and an external device, for example, the state of each field can be grasped remotely by the external device. Water supply can be controlled remotely. If a storage battery for supplying power for operating the water supply control unit and the wireless communication unit is provided, a water tap can be constructed at low equipment cost even in a field away from the commercial power supply facility. Moreover, by setting the water retention relative position by the water supply control unit described above, it is possible to suppress consumption of the storage battery such as repeated opening and closing of the valve mechanism in response to the decrease in the water level due to the effect of the reduced depth of water in the field.

In addition to the above-described first characteristic configuration, the second characteristic configuration is that the water supply control unit does not include a mechanism for detecting an obstruction due to clogging, and the relative position of the valve seat and the valve body is controlled by the water holding mechanism. It is characterized in that clogging release control is performed by temporarily adjusting the valve mechanism to the opening side after adjustment to the relative position and then adjusting the valve mechanism to the water retention relative position again.

When the relative positions of the valve seat and the valve body are adjusted to the water retention relative position, for example, when a gap is formed between the seal member and the valve seat, contaminants flow into the gap together with the leaked water and accumulate around the valve mechanism. clogging may occur. In such a case, the water supply control unit temporarily adjusts the valve mechanism to the open side and then adjusts it to the water retention relative position again, thereby preventing the valve mechanism from detecting a clogging failure without providing a mechanism for detecting the obstruction due to clogging. clogging can be cleared.

In the third characteristic configuration, in addition to the above-described first or second characteristic configuration, the water supply control unit adjusts the relative position of the valve seat and the valve body to the water retention relative position, The point is that when it is detected that the water level has risen above the target water level, the relative positions of the valve seat and the valve body are adjusted to a second water retention relative position that is closer than the water retention relative position.

After the water level in the field reaches the target water level and the valve mechanism is set to the water retention relative position, even if there is a large amount of water leaking from the valve mechanism and there is a risk of overflow from the field, the water supply control unit will prevent the water level in the field from reaching the target water level. is detected, the relative positions of the valve seat and the valve body are adjusted to the second water retention relative position, which is closer than the water retention relative position, thereby avoiding wasteful water supply.

The fourth characteristic configuration is, in addition to any one of the first to third characteristic configurations described above, the water retention relative position is configured to be settable from the external device via the wireless communication unit, and the valve The relative position of the seat and the valve body is set at a position where the amount of leakage is less than the amount of water corresponding to the reduced water depth of the field where the water tap is installed .

Even if the relative positions of the valve seat and the valve body are set so that water leaks from the valve mechanism into the field, if the amount of leaked water is less than the amount of water corresponding to the reduced water depth of the field. , there is no wasteful overflow of irrigation water from the field. In addition, the decrease in the field water level is delayed, and the frequency of opening and closing the valve can be reduced. The water retention relative position at which the amount of water supply is less than the amount of water corresponding to the water reduction depth for each field can be set from an external device via the wireless communication unit.

In addition to the above-described fourth characteristic configuration, the fifth characteristic configuration is configured such that the water retention relative position can be set from the external device via the wireless communication unit, and the valve seat and the valve body The relative position is set at a position where the amount of leakage is less than the amount of water corresponding to the depth of water reduction according to the season or the growth stage of crops.

The water retention relative position need not always be constant, and may be set to different positions depending on the season or the growing stage of crops. For example, the amount of evaporation from the paddy surface and the amount of transpiration varies depending on the growing conditions of the crops grown in the field. Useless water supply can be avoided while delaying the progress of deterioration.

The sixth characteristic configuration, in addition to the above-described fourth characteristic configuration, is configured such that the water retention relative position can be set from the external device via the wireless communication unit, and the valve seat and the valve body The relative position is set at a position where the amount of leakage is less than the amount of water corresponding to the water reduction depth corresponding to the water retention characteristics of the field, including the size of the field, the soil quality of the field, and the condition of the ridges.

The water retention characteristics of a field vary depending on the field characteristics such as the size of the field, the soil quality that makes up the field, and the condition of the ridges. In addition, useless water supply can be avoided while delaying the progress of deterioration of sealing members and the like.

A first characteristic configuration of an agricultural field water level control device according to the present invention is a water faucet having any one of the first to sixth characteristic configurations described above, and a drainage water level adjustment section capable of adjusting the vertical height from the field surface. and a drain plug for adjusting the reservoir water level of the field.

The irrigation water supplied to the field from the water tap constituting the field water level control device is stored up to the reservoir water level adjusted by the drain water level adjustment part provided in the drain cock constituting the field water level control device.

A first characteristic configuration of an agricultural field management apparatus according to the present invention includes a water tap having any one of the first to sixth characteristic configurations described above, and a drain plug for adjusting the water level of a field. The plug includes a drainage water level adjustment unit capable of adjusting the vertical height from the surface of the field, a water level control unit automatically adjusting the vertical height of the drainage water level adjustment unit via a drive mechanism , the water level control unit and the a wireless communication unit that connects to an external device, wherein the water level control unit controls the waste water level adjustment unit so that the waste water level reaches the target water level indicated by the external device. After the water supply control unit adjusts the relative position of the valve seat and the valve body to the water retention relative position based on the instruction from the external device, the water level control unit controls the Also, the vertical height of the drain water level adjusting section is adjusted to a position higher than the target water level.

The water level control unit adjusts the drainage water level adjustment unit to the reservoir water level, and water is supplied from the water tap to the field. After the reservoir water level in the field reaches the target water level and the relative position of the valve seat and the valve body of the faucet is adjusted to the water retention relative position, the water level controller adjusts the drainage water level adjustment part to a position higher than the target water level. Thus, it becomes possible to measure the increase in water level when the amount of water leakage from the valve mechanism adjusted to the water retention relative position is larger than expected.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a hydrant, an agricultural field water level management device, and an agricultural field management device that can suppress the deterioration of the seal member and the actuator that constitute the valve mechanism.

Illustration of field and field water management system Explanatory drawing of hydrant (a) is an illustration of the valve mechanism in the water stop relative position, (b) is an illustration of the valve mechanism in the water retention relative position, and (c) is an illustration of the valve mechanism in the open state. (a) is an explanatory diagram of the side view of the drain plug, (b) is an explanatory diagram of the drainage control mechanism

A farm field management device and a farm field management method equipped with a drain plug and a water tap will be described below.
[Configuration of field water management system]
As shown in FIG. 1, in each field 1 where rice is cultivated, there are water taps 12 that guide water flowing through water supply pipes 10 to the fields 1 through water conduits 11, A drain plug 22 is provided for draining water from the farm to a drainage channel 20 , and a repeater 32 such as a LoRa radio for relaying connection with the Internet 30 is installed near the field 1 . Further, the drain plug 22 is provided with a capacitive water level sensor 2 for measuring the water level of the field 1 .

Each water tap 12 and drain tap 22 is configured to be connectable to a cloud server 34, which is an agricultural field management server, via the Internet 30, and a mobile terminal 36 such as a smartphone owned by an administrator of the agricultural field 1 is connected to the cloud via the Internet 30. It is configured to be connectable with the server 34 . That is, the water management system 100 of the farm field is composed of the water taps 12, the drain taps 22, the portable terminal 36, the cloud server 34, and the Internet 30 that communicably connects them.

Taking rice cultivation as an example, each process of rice cultivation, such as puddling, rice planting, rooting stage, tillering stage (early stage, late stage), young panicle formation stage, ear emergence flowering stage, ripening stage, etc. It is necessary to adjust the reservoir water level of

[Configuration of hydrant]
The water tap 12 will be described in detail below.
As shown in FIG. 2, the water tap 12 is detachably attached to a water supply mechanism 12A housed in a water supply pit 101 provided in a field, and to the upper surface of the water supply mechanism 12A, and controls the water supply mechanism 12A to supply or supply water. It has a water supply control mechanism 12B that switches to either stop water.

The water supply mechanism 12A includes a cylindrical valve box 120, a valve seat 121 protruding inwardly from the center of the valve box 120 in the vertical direction, and a rubber seal member on the bottom surface. It has a disk-shaped valve body 124 to which 123 is attached. A lower end of the valve box 120 is connected to the water conduit 11 branched from the water supply pipe 10 .

A bearing 126 having a female thread formed on its inner peripheral surface is attached to the upper end of the valve box 120 , and a valve shaft 125 having a male thread formed on its outer peripheral surface is screwed into the bearing 126 . A lower end of the valve shaft 125 is rotatably fixed to the valve body 124 .

A water passage hole 122 is formed in the central portion of the valve seat 121, and a plurality of water outlet windows 127 are formed in the upper portion of the side wall of the valve box 120 so as to be arranged in the circumferential direction. When a rotational force is applied to the valve shaft 125, the valve shaft 125 moves up and down along the bearing 126, and the valve body 124 moves up and down as the valve shaft 125 moves up and down. That is, the valve mechanism is composed of the valve seat 121, the valve body 124, and the seal member 123 provided between the valve seat 121 and the valve body 124, and the like.

The water supply control mechanism 12B includes a casing 131, a solar panel 132 attached to the top surface of the casing 131 in an inclined posture so as to face the sun, a drive mechanism 140 housed in the casing 131, a storage battery 133, and an antenna 134. , a control panel 135 and the like. The control panel 135 incorporates a valve opening/closing control unit 136 that functions as a water supply control unit, a wireless communication unit 137, and the like.

The opening/closing control unit 136 and the wireless communication unit 137 are configured to include peripheral circuits such as a CPU, a memory, an input/output circuit, and a communication circuit. , the opening/closing control function for the valve mechanism provided in the water supply mechanism 12A is realized.

The opening/closing control unit 136 controls the drive mechanism via the drive mechanism 140 so as to open the valve to a preset valve opening degree when a water supply instruction is received from the cloud server 34 via the wireless communication unit 137 .

Electric power generated by the solar panel 132 is charged to the storage battery 133 , and the charged electric power of the storage battery 133 is consumed as control electric power for the opening/closing control section 136 and the wireless communication section 137 .

The drive mechanism 140 includes a DC motor 141 with a built-in encoder, a hollow main gear 143 that meshes with a gear 142 provided on the output shaft of the DC motor 141, and a drive shaft 146 inserted through the hollow portion of the main gear 143. etc., and functions as an actuator for driving the valve body 124 up and down.

The main gear 143 is a double-boss gear having a vertically extending cylindrical boss portion 144 and a disc-shaped gear portion 145 extending from the vertically central portion of the boss portion 144. The top and bottom of 144 are rotatably supported by bearings. A key protruding from the outer peripheral surface of the drive shaft 146 is engaged with a key groove formed on the inner peripheral surface of the boss portion 144, so that the main gear 143 and the drive shaft 146 rotate integrally.

The lower end of the drive shaft 146 and the upper end of the valve shaft 125 are drivably connected via a coupling 147, and when the DC motor 141 rotates in one direction, the valve element 124 rises to enter the water supply state (see FIG. 3(c)). ), and when the DC motor 141 rotates in the opposite direction, the valve body 124 descends to stop water (see FIG. 3A).

The water supply control unit (opening/closing control unit 136) sets the relative position of the valve seat 121 and the valve element 124 after the field water level reaches the target water level during flooding to a water retention relative position that is different from the water stop relative position for stopping water when the water falls. configured to be set in position.

As shown in FIG. 3( a ), the opening/closing control unit 136 controls the valve seat 121 and the valve body 124 so that the irrigation water in the water supply pipe does not leak into the field from the hydrant when the irrigation water is drained from the field. By setting the relative position to the water stop relative position and pressing the valve body 124 against the valve seat 121 with a predetermined pressure to compress the seal member 123 sandwiched between the valve body 124 and the valve seat 121, a large elastic restoring force is generated. Increase water stopping power.

On the other hand, when the farm field is flooded, as shown in FIG. The valve body 124 is pressed against the valve seat 121 with a pressure lower than the pressure at the relative position, for example, the water stop relative position, and the sealing member 123 sandwiched between the valve body 124 and the valve seat 121 is slightly compressed, or the seal member 123 is pressed. The relative positions are set so that the members 123 are not compressed and allow slight water leakage.

If the relative positions of the valve seat 124 and the valve body 121 are set to the water retention relative position to stop the water when flooded, the water will not overflow from the field even if the water leaks into the field. In addition, even when the water level is lowered due to the effect of the reduced depth of water in the field and it is necessary to repeatedly open and close the valve mechanism, a large pressing force is not repeatedly applied to the seal member 123 and the like. Such deterioration can be suppressed.

It is preferable that the water retention relative position is set to a relative position that allows water supply of less than the amount of water corresponding to the water reduction depth. Even when the relative position of the body 124 is set, if the amount of leaked water is less than the amount of water corresponding to the reduced water depth of the field, the water does not wastefully overflow from the field.

The opening/closing control unit 136 controls the relative position of the valve seat 121 and the valve body 124 based on the output of the encoder provided in the DC motor in order to close the valve when the water falls, that is, to control the relative position to stop the water. The position when the seal member 123 is pressed with a predetermined pressure that does not cause water leakage is stored in memory in advance as a reference position, and the reference position is indicated by counting down the number of encoder pulses counted when the valve is opened and when the valve is closed. It can be controlled to the water stop relative position by driving until it becomes zero.

It is also possible to monitor the current value of the DC motor with a current sensor and determine that the water stop relative position is reached when the current value indicates a predetermined value when the plug is closed. This utilizes the phenomenon that the drive torque of the DC motor increases when the seal member 123 is pressed when the plug is closed, and the current value increases accordingly. When determining whether or not the drive torque has reached the torque corresponding to the water stop relative position by using the current value of the DC motor as an index when controlling to the water stop relative position, control is similarly performed to the water hold relative position. In fact, it is also possible to use the current value of the DC motor as an index to determine whether or not the drive torque has reached the torque corresponding to the water retention relative position lower than the torque corresponding to the water stop relative position.

Further, the opening/closing control unit 136 controls the relative positions of the valve seat 121 and the valve body 124 based on the output of the encoder in order to close the valve when flooded, that is, to control the water retention relative position. A predetermined offset value may be set to zero, which is the number of pulses of the encoder corresponding to the water stop relative position, to stop before reaching the water stop relative position. Also, the current value of the DC motor may be monitored, and the DC motor may be stopped when the current value rises to a value lower than the current value corresponding to the water stop relative position by a predetermined value. In this way, by controlling the closing of the plug to the water retention relative position during flooding, it is possible to reduce the degree of deterioration over time of the seal member 123 and the drive mechanism 140 and suppress the consumption of the storage battery 133 .

The water retention relative position need not always be constant, and may be set to different positions depending on the season or the growing stage of crops. For example, the amount of evaporation from the paddy surface and the amount of transpiration varies depending on the growing conditions of the crops cultivated in the field. By taking into account the effects of factors that fluctuate depending on the season, such as water depth reduction, it is possible to slow down the deterioration of sealing materials. However, wasteful water supply can be avoided. In other words, it is preferable that the water retention relative position is set to a different position depending on the season.

Furthermore, the water retention relative position may be set to a position corresponding to the field characteristics. The water retention characteristics of a field vary depending on the field characteristics such as the size of the field, the soil quality that makes up the field, and the condition of the ridges. In addition, useless water supply can be avoided while delaying the progress of deterioration of the seal member 123 and the like.

In addition, the opening/closing control unit 136 adjusts the relative position of the valve seat 121 and the valve body 124 to the water retention relative position, then temporarily adjusts the valve mechanism to the opening side, and then adjusts the valve mechanism to the water retention relative position again. is configured to perform

When the relative position of the valve seat 121 and the valve body 124 is adjusted to the water retention relative position, for example, when a gap is formed between the seal member 123 and the valve seat 121, contaminants flow into the gap together with leaked water and accumulate around it. However, the valve mechanism may become clogged. In such a case, the opening/closing control unit 136 temporarily adjusts the valve mechanism to the open side and then adjusts it to the water retention relative position again, thereby eliminating clogging of the valve mechanism.

After adjusting the relative positions of the valve seat 121 and the valve body 124 to the water retention relative position, the opening/closing control unit 136 adjusts the relative positions of the valve seat 121 and the valve body 124 when detecting that the water level in the field has risen to the target water level. It is preferable to adjust to a second water-retaining relative position that is closer than the water-retaining relative position described above.

After the water level in the field reaches the target water level and the valve mechanism is set to the water retention relative position, even if there is a large amount of water leaking from the valve mechanism and there is a risk of overflow from the field, the opening/closing control unit 136 keeps the water level in the field at the target level. When it is detected that the water level has risen, the relative positions of the valve seat 121 and the valve body 124 are adjusted to a second water retention relative position that is closer than the water retention relative position, thereby avoiding unnecessary water supply. .

[Configuration of drain plug]
The drain plug 22 for adjusting the water level in the field will be described in detail below.
As shown in FIGS. 4A and 4B, the drain plug 22 is detachably attached to a drainage mechanism 22A housed in a drainage basin 201 provided in the field, and to the upper surface of the drainage basin 201. A drainage control mechanism 22B is provided to control the drainage water level (reserved water level) by controlling the drainage water level 22A.

The drainage mechanism 22A includes a receiving frame member 211 installed at the bottom of the drainage basin 201, a weir body 212 which is a cylindrical drainage pipe supported by the receiving frame member 211 so as to be vertically movable, and an elevating mechanism for moving the weir body 212 up and down. A mechanism 220 is provided. The upper end opening of the weir body 212 functions as a drain port 212a, and surplus water supplied to the field 1 overflows from the drain port 212a and flows out to the discharge channel 21.

A U-shaped support portion 213 in a side view is fixed to the upper end opening of the dam body 212 , and an elevating mechanism 220 is attached to the support portion 213 . The lifting mechanism 220 has a cylindrical movable portion 221 fixed to the upper surface of the support portion 213 and having a female screw formed on the inner peripheral surface, and a male screw formed on the outer peripheral surface and screwed with the female screw of the movable portion 221 . and a pair of rod-shaped bodies 223 that prevent the movable portion 221 from rotating together with the rotating shaft 222 .

That is, when the rotating shaft 222 rotates in one direction, the gate body 212 attached to the movable portion 221 via the support portion 213 rises together with the movable portion 221, and when the rotating shaft 222 rotates in the opposite direction, The gate body 212 attached to the movable portion 221 via the support portion 213 descends together with the movable portion 221 . The drain water level adjusting section 210 is configured by the gate body 212 and the elevating mechanism 220 described above.

The drainage control mechanism 22B includes a watertight casing 231 detachably attached to the upper surface of the drainage basin 201 via a pedestal 202, and a solar panel 232 attached to the top surface of the casing 231 in an inclined posture so as to face the sun. , a drive mechanism 240 housed in a casing 231, a storage battery 233, an antenna 234, a control panel 235, and the like. The control panel 235 incorporates a water level control section 236, a wireless communication section 237, and the like.

The water level control unit 236 and the wireless communication unit 237 are configured to include peripheral circuits such as a CPU, a memory, an input/output circuit, and a communication circuit. , the control function for the drain water level control unit 210 is realized.

The water level control unit 236 controls the drainage water level adjustment unit 210 via the drive mechanism 240 so as to achieve the drainage water level instructed by the cloud server 34 via the wireless communication unit 237, and controls the agricultural field via the water level sensor 2 described later. , and reports the measured water level to the cloud server 34 via the wireless communication unit 237 .

Electric power generated by the solar panel 232 is charged to the storage battery 233 , and the charged electric power of the storage battery 233 is consumed as control electric power for the water level control section 236 and the wireless communication section 237 .

The drive mechanism 240 includes a DC motor 241 with a built-in encoder, a hollow main gear 243 that meshes with a gear 242 provided on the output shaft of the DC motor 241, and a drive shaft 246 inserted through the hollow portion of the main gear 243. etc., and functions as an actuator for driving the drain water level adjusting unit 210 up and down.

The main gear 243 is a double-boss gear having a vertically extending cylindrical boss portion 244 and a disk-shaped gear portion 245 extending from the vertically central portion of the boss portion 244. The top and bottom of 244 are rotatably supported by bearings. A key groove formed on the inner peripheral surface of the boss portion 244 is fitted with a key 246k protruding from the outer peripheral surface of the drive shaft 246, so that the main gear 243 and the drive shaft 246 are configured to rotate integrally. .

The lower end of the drive shaft 246 and the upper end of the rotary shaft 222 are drivingly connected via a coupling 247 (see FIG. 2(a)). When the (storage water level) rises and the DC motor 241 rotates in the opposite direction, the gate body 212 descends and the drain water level (storage water level) descends.

By setting the position where the upper end opening position of the weir body 212 is at the level of the paddy field as a reference position and managing the upper end opening position of the weir body 212 based on the number of encoder pulses detected when the DC motor 241 is driven, The upper end opening position of the weir body 212 can be controlled to a desired height.

[Configuration of field water level control device]
An agricultural field water level control apparatus is configured by including the water tap 12 described above and a drainage tap 22 that has a drainage water level adjustment unit 210 that can adjust the vertical height from the field surface 1 s and adjusts the water level in the field. The irrigation water supplied to the field from the water tap constituting the management device is stored up to the reservoir water level adjusted by the drainage water level adjustment part provided in the drain cock constituting the field water level management device.

[Configuration of field management device]
The water tap 12 described above, the drainage water level adjustment unit 210 that can adjust the vertical height from the paddy surface 1s of the field 1, and the drainage control unit 236 that automatically adjusts the vertical height of the drainage water level adjustment unit 210 via the actuator. and a drain plug 22 for adjusting the water level in the field 1, the water supply control unit 136 adjusting the relative position of the valve seat 121 and the valve body 124 to the water retention relative position, It is preferable that the drainage controller 236 is configured to adjust the vertical height of the drainage water level adjuster 210 to a position higher than the target water level.

The drainage control unit adjusts the drainage water level adjustment unit to the reservoir water level, and water is supplied from the water tap to the field. After the reservoir water level in the field reaches the target water level and the relative positions of the valve seat and the valve body of the water faucet are adjusted to the water retention relative position, the drainage water level adjustment unit is adjusted to a position higher than the target water level. It becomes possible to measure a rise in the water level when there is more water leakage from the valve mechanism adjusted to the position than expected.

The embodiment described above is merely an example of the present invention, and is not intended to limit the technical scope of the present invention. Needless to say, the design can be changed as appropriate within the scope of the effects of the invention.

100: Field water management system 1: Field 1s: Field surface 2: Water level sensor 10: Water supply pipe 12: Water tap 20: Drainage channel 22: Drain valve 30: Internet 32: Relay 34: Field management server (external device)
121: valve seat 123: sealing member 124: valve body 135: opening/closing control section (water supply control section)
140: Drive mechanism (actuator) of water tap
210: Drainage water level adjustment unit 236: Water level control unit 240: Drain plug drive mechanism (actuator)

Claims (8)

A valve mechanism having a seal member between a valve seat and a valve body, an actuator for adjusting the relative position of the valve seat and the valve body, a water supply control section for controlling the actuator, the water supply control section and a field. and a storage battery for supplying power to the actuator, the water supply control unit, and the wireless communication unit. and
The water supply control unit is configured to be able to control the valve mechanism based on a water supply instruction from the external device via the wireless communication unit,
The water supply control unit sets the relative position of the valve seat and the valve element to a position in which the valve is open in a water supply state until the field water level reaches the target water level during flooding, and the field water level reaches the target water level. The relative position of the valve seat and the valve body after the above is the water stop relative position when the water is completely stopped by pressing the valve body against the valve seat with a predetermined pressure and compressing the seal member to completely stop water. Differently, the water faucet is configured to compress the seal member at a pressure lower than the predetermined pressure, or set to a water retention relative position that allows slight water leakage without compressing the seal member. The water supply controller adjusts the relative position of the valve seat and the valve body to the water retention relative position without providing a mechanism for detecting a failure due to clogging , and then temporarily adjusts the valve mechanism to the open side. 2. The water faucet according to claim 1, wherein clogging release control for adjusting the water holding relative position again is performed later. After adjusting the relative position of the valve seat and the valve body to the water retention relative position, the water supply control unit detects that the water level in the field has risen above the target water level, 3. The faucet according to claim 1 or 2, wherein the position is adjusted to a second water-retaining relative position which is closer than the water-retaining relative position. The water retention relative position is configured to be settable from the external device via the wireless communication unit, and the relative position of the valve seat and the valve body corresponds to the water reduction depth of the field where the water tap is installed. 4. The water tap according to any one of claims 1 to 3 , which is set at a position where the amount of leakage is less than that. The water retention relative position is configured to be settable from the external device via the wireless communication unit, and the relative position of the valve seat and the valve body is the amount of water corresponding to the depth of water reduction according to the season or stage of crop growth. 5. The water tap according to claim 4 , which is set at a position where the amount of leakage is less than that. The water retention relative position is configured to be settable from the external device via the wireless communication unit, and the relative position of the valve seat and the valve body varies depending on the size of the field , the soil quality of the field, and the condition of the ridges. 5. The hydrant according to claim 4 , which is set at a position where the amount of leakage is less than the amount of water corresponding to the reduced water depth corresponding to the water retention characteristics of the field. An agricultural field water level control device comprising: the water tap according to any one of claims 1 to 6 ; Equipped with a water tap according to any one of claims 1 to 6 and a drain tap for adjusting the reservoir water level in the field,
The drain plug includes a drainage water level adjustment unit that can adjust the vertical height from the surface of the field, a water level control unit that automatically adjusts the vertical height of the drainage water level adjustment unit via a drive mechanism , and the water level control unit. and a wireless communication unit that connects the external device ,
The water level control unit is configured to control the drainage water level adjustment unit so that the drainage water level reaches the target water level indicated by the external device,
After the water supply control unit adjusts the relative position of the valve seat and the valve element to the water retention relative position based on the instruction from the external device, the water level control unit performs the A farm field management device configured to adjust the vertical height of the drainage water level adjustment unit to a position higher than a target water level.

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