JP2020115763A - Water-supply system of agricultural greenhouse - Google Patents

Abstract

To provide a water-supply system of an agricultural greenhouse which can quickly complete a drain action from spraying-use piping.SOLUTION: A water-supply system 1 of an agricultural greenhouse comprises a spraying-use piping 2, a plurality of spray nozzles 25, a spraying-use on-off valve 28 and two air introduction valves 3. Water from a pump 81 is supplied to the spraying-use piping 2. The plurality of spray nozzles 25 and the spraying-use on-off valve 28 are provided on the spraying-use piping 2. The two air introduction valves 3 open when pressure reaches a prescribed pressure or less to introduce air into the spraying-use piping 2. The spraying-use piping 2 includes a vertical piping 21 into which water from the pump 81 is supplied, and a horizontal piping 22 which communicates with a top part of the vertical piping 21 and is connected to the plurality of spray nozzles 25. At least a part of the plurality of spray nozzles 25 are positioned between the two air introduction valves 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to a water supply device for an agricultural house.

Conventionally, an agricultural house is known (for example, refer to Patent Document 1). An agricultural house includes a house body installed so as to cover the soil, and a water supply device for spraying water in the house body. The water supply device includes a spray pipe to which water is supplied from a pump, and a plurality of spray nozzles connected to the spray pipe.

JP, 2014-50570, A

In the water supply device for an agricultural house described above, it is required to take measures to prevent freezing in the spray pipe. On the other hand, it is effective to install a heater for prevention of freezing, but installation of the heater causes an increase in cost, and therefore it is common to deal with draining water from the pipe.

However, in the water supply device of the agricultural house, the spray pipe is often very long (for example, about 50 m). Therefore, if the water draining operation takes a long time, there is a possibility that freeze fracture will eventually occur.

An object of the present invention is to propose a water supply device for an agricultural house that can quickly complete the water draining operation from the spray pipe.

A water supply device for an agricultural house according to an aspect of the present invention includes a spray pipe to which water is supplied from a pump, and a plurality of spray nozzles connected to the spray pipe and positioned at a distance from each other in the horizontal direction. A spray opening/closing valve provided in the spray piping so as to be interposed between the pump and the spray nozzles, and the spray piping is separated from the pump more than the spray opening/closing valve. Two airs connected to different locations and closed when the water pressure in the spray pipe exceeds a predetermined pressure and opened when the water pressure in the spray pipe falls below the predetermined pressure to introduce air into the spray pipe. And an introduction valve. The spray pipe includes a vertical pipe to which water is supplied from the pump, and a horizontal pipe that communicates with an upper portion of the vertical pipe and is connected to a plurality of spray nozzles. At least a part of the plurality of spray nozzles is located between the two air introduction valves.

INDUSTRIAL APPLICABILITY The present invention has an effect that the water draining operation from the spray pipe can be completed promptly.

FIG. 1 is a schematic diagram showing a configuration of a water supply device included in an agricultural house according to an embodiment. FIG. 2 is a schematic view showing an intermediate stage of the water draining operation of the water supply device of the above. FIG. 3 is a schematic view showing the next intermediate stage of the water draining operation of the above water supply device. FIG. 4 is a schematic diagram showing an intermediate stage of a water draining operation in a comparative example of the above water supply device. FIG. 5: is the schematic which shows the intermediate stage of the water removal operation in the 1st modification of the water supply apparatus same as the above. FIG. 6 is a schematic view showing an intermediate stage of the water draining operation in the second modified example of the water supply device. FIG. 7: is schematic which shows the intermediate stage of the water removal operation in the 3rd modification of the water supply apparatus same as the above. FIG. 8: is schematic which shows the intermediate stage of the water removal operation in the 4th modification of the water supply apparatus same as the above.

(One embodiment)
As shown in FIG. 2 and the like, the agricultural house of one embodiment includes a house main body 9 for the purpose of preparing an environment suitable for growing plants. The house body 9 is composed of a so-called vinyl house.

The house body 9 is installed so as to cover the soil S. Inside the house body 9, after the seeds of the plant are planted in the soil S or the seedlings are planted, the plant is grown. In order to supply water to the plants grown in the house body 9, a water supply device 1 for supplying water is provided in the house body 9.

In the agricultural house of one embodiment, the water supply device 1 includes a pump 81, a water supply passage 82 to which water is supplied from the pump 81, a spray pipe 2 connected to the water supply passage 82, and a spray pipe 2. Is provided with a irrigation pipe 4.

The water supplied by the pump 81 to the water supply passage 82 is, for example, water stored in a water storage tank. The water supplied to the water supply channel 82 is selectively supplied to the spray pipe 2 and the irrigation pipe 4 located below the spray pipe 2. The form of supplying water in the house body 9 through the spraying pipe 2 and the form of supplying water in the house body 9 through the irrigation pipe 4 are different from each other.

A configuration for supplying water into the house body 9 through the spray pipe 2 will be described in detail below.

The spray pipe 2 includes a vertical pipe 21 that is vertically long, and a horizontal pipe 22 that is horizontally long. The water supply channel 82 is connected to the lower portion of the vertical pipe 21. The horizontal pipe 22 is connected to the upper portion of the vertical pipe 21. The horizontal pipe 22 is located above the water supply channel 82.

The water supplied from the pump 81 to the vertical pipe 21 of the spraying pipe 2 through the water supply passage 82 is lifted upward through the vertical pipe 21 by its water pressure and then horizontally supplied through the horizontal pipe 22.

The vertical pipe 21 is provided with a spray opening/closing valve 28. The spray opening/closing valve 28 is an electrically driven valve capable of prohibiting or permitting the passage of water through the vertical pipe 21, and is composed of an appropriate solenoid valve or electric valve.

A plurality of spray nozzles 25 are connected to the horizontal pipe 22. The plurality of spray nozzles 25 are located at a distance from each other in the axial direction (horizontal direction) of the horizontal pipe 22. Each of the spray nozzles 25 is configured to spray the water into the house main body 9 when the horizontal pipe 22 is supplied with water with a certain pressure or more. The water sprayed from each spray nozzle 25 falls on the soil S over a relatively long time. Depending on the shape of the spray nozzle 25, it is possible to atomize the sprayed water particles and retain them in the air.

The spray opening/closing valve 28 is interposed between the pump 81 and the spray nozzles 25. By opening and closing the spray on-off valve 28, it is possible to prohibit or allow water to flow to the plurality of spray nozzles 25.

Further, two air introduction valves 3 are connected to the spray pipe 2 in order to efficiently perform the water draining operation of the spray pipe 2. Each air introduction valve 3 is configured to close when the water pressure in the spray pipe 2 exceeds a predetermined pressure (for example, 0.4 MP) and open when the water pressure falls below the predetermined pressure.

The two air introduction valves 3 are connected to the spray pipe 2 at a position farther from the pump 81 and the water supply passage 82 than at the position where the spray opening/closing valve 28 is provided. In the spray pipe 2, all of the plurality of spray nozzles 25 are located between the two air introduction valves 3.

In the following, of the two air introduction valves 3, the one closer to the pump 81 is called the first air introduction valve 3a, and the one farther from the pump 81 is called the second air introduction valve 3b.

The first air introduction valve 3a is connected to the upper end of a vertical pipe 21 extending vertically. The upper end of the vertical pipe 21 is a portion of the vertical pipe 21 that is farthest from the pump 81. The horizontal pipe 22 communicates with a portion of the vertical pipe 21 that is below the portion to which the first air introduction valve 3a is connected.

The second air introduction valve 3b is connected to a portion of the horizontal pipe 22 that is farthest from the pump 81. Both the first air introduction valve 3a and the second air introduction valve 3b are located above the spray opening/closing valve 28 and above the plurality of spray nozzles 25.

Therefore, when the spray on-off valve 28 is opened and the pump 81 is driven to feed water into the spray pipe 2, the fed water fills the entire spray pipe 2 (vertical pipe 21 and horizontal pipe 22). The first air introduction valve 3a and the second air introduction valve 3b are closed by the water pressure at this time. By continuously driving the pump 81 in this state, water is continuously sprayed from the plurality of spray nozzles 25, as shown in FIG.

The drive of the pump 81 and the spray opening/closing valve 28 is controlled by the controller 5 installed in the house body 9.

The control device 5 is a device that can control each device included in the water supply device 1, and includes, for example, a so-called microcomputer that operates according to a program. The control device 5 may be a general-purpose computer or may be configured as a dedicated device.

The control device 5 has an input unit 55 capable of inputting an instruction of a water draining operation. The input unit 55 may be any unit as long as it can input an instruction, and an appropriate device such as a push button, a touch panel, and a voice recognizer can be adopted. The specific water draining operation will be described later.

Next, a configuration for supplying water into the house body 9 through the irrigation pipe 4 will be described in detail.

The irrigation pipe 4 is used for irrigating the soil. The irrigation pipe 4 includes a pipe 41 provided with an irrigation on-off valve 48 and a irrigation tube 42 connected to the pipe 41. The irrigation on-off valve 48 is an electrically driven valve capable of prohibiting or permitting passage of water through the pipe 41, and is composed of an appropriate solenoid valve or electric valve.

The pipe 41 is connected to a lower portion of the vertical pipe 21 of the spray pipe 2. The irrigation on-off valve 48 interposed in the flow path of the pipe 41 is located below the spray on-off valve 28 interposed in the flow path of the vertical pipe 21.

The irrigation tube 42 is located below the irrigation on-off valve 48. The irrigation tube 42 is a tube elongated in the horizontal direction, and a large number of fine irrigation holes 425 are formed on the peripheral wall thereof. The irrigation tube 42 is configured such that when water is supplied with a water pressure of a certain level or higher, the water gushes through a number of irrigation holes 425 in a shower shape or a fountain shape. The water ejected from the irrigation tube 42 quickly drops onto the soil S or the plant.

Therefore, when the irrigation on-off valve 48 is opened and the pump 81 is driven to feed the water into the irrigation pipe 4, the fed water fills the irrigation tube 42 through the pipe 41, and from the many irrigation holes 425. Erupted. The drive of the irrigation on-off valve 48 is controlled by the controller 5.

Next, the water draining operation performed by the water supply device 1 will be described in detail.

When the user inputs an instruction of the water draining operation through the input unit 55, the control device 5 maintains the pump 81 in a stopped state and opens the spray opening/closing valve 28 and the irrigation opening/closing valve 48, whereby the water Execute the unplugging operation.

At this time, of the water on the side of the vertical pipe 21 and the water on the side of the horizontal pipe 22, the water on the side of the vertical pipe 21 has a large force of dropping due to its own weight, so that the first air introduction valve 3a. The water on the side of the vertical pipe 21 first drops while drawing air through the vertical pipe 21 (see FIG. 3). The water that has dropped through the vertical pipe 21 is discharged to the outside through the large number of irrigation holes 425 of the irrigation tube 42.

After the water on the side of the vertical pipe 21 begins to drop, the water on the side of the horizontal pipe 22 sequentially flows down to the side of the vertical pipe 21 while drawing air into the horizontal pipe 22 through the second air introduction valve 3b. (See Figure 4).

That is, in the water supply device 1 according to the embodiment, the water remaining in the spray pipe 2 is divided into two via the air introduced through the first air introduction valve 3a, and the water is vertically separated from the divided water. First, the water on the side of the pipe 21 is quickly discharged. Next, of the divided water, the water on the side of the horizontal pipe 22 is discharged through the vertical pipe 21 and the irrigation pipe 4 so as to follow the flow of water and air on the side of the vertical pipe 21.

Therefore, according to the water supply device 1 of the embodiment, the water removal operation can be completed promptly while drawing in air from two locations in the spray pipe 2, and the occurrence of freeze fracture is effectively suppressed. You can

The timing at which the control device 5 executes the water draining operation is not limited to the timing at which the user inputs an instruction to the input unit 55, and may be the timing at which the outside air temperature becomes lower than the predetermined temperature, for example. In this case, when the control device 5 determines that the outside air temperature detected by the outside air temperature sensor 96 is lower than the predetermined temperature by using the outside air temperature sensor 96 installed in the house main body 9, the above water draining operation is performed. Let it run. The predetermined temperature can be appropriately set based on the surrounding environment and the like. Alternatively, the control device 5 may be connected to the outside via the Internet or the like and the determination may be made using the predicted minimum temperature of the weather forecast.

The controller 5 may open the spray opening/closing valve 28 and the irrigation opening/closing valve 48 for the water draining operation at the same time or at different timings.

When the controller 5 opens the irrigation on-off valve 48 after opening the spray on-off valve 28, the water remaining above the spray on-off valve 28, the spray on-off valve 28, and the irrigation water The water remaining between the on-off valve 48 can be made to flow down at once in a continuous flow.

FIG. 4 shows a comparative example of the water supply device 1 according to the embodiment. In addition, the same code|symbol is attached|subjected about the structure similar to the structure of the water supply apparatus 1 of one embodiment among the structures of a comparative example.

In the comparative example, only one air introduction valve 3 is connected to the spray pipe 2. The air introduction valve 3 is connected to the lateral pipe 22 at a position farthest from the pump 81.

In the comparative example as well, the control device 5 maintains the pump 81 in the stopped state and opens the spray on-off valve 28 and the irrigation on-off valve 48, so that the air is introduced from the air introduction valve 3 to the spray pipe 2. The water draining operation can be performed while being introduced. The water remaining in the spray pipe 2 gradually flows down as a stream of water that fills the pipeline.

However, the spray pipe 2 of the agricultural house is very long, and the pressure loss in the spray pipe 2 is usually large. Therefore, if it is attempted to drain the entire water remaining in the spray pipe 2 in a lump as in the comparative example, it may take time to complete the process. On the other hand, in the water supply device 1 of one embodiment, as described above, the water remaining in the spray pipe 2 can be quickly discharged while introducing air into the spray pipe 2 to divide the water. ..

(Modification)
Various modifications of the water supply device 1 according to the embodiment will be described with reference to FIGS. 5 to 8. In addition, among the configurations of the modified example, configurations similar to the above-described configurations of the water supply device 1 according to the embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 5 schematically shows a first modified example of the water supply device 1 according to the embodiment. In the first modification, a drainage pipe 61 is connected in the middle of the pipe 41 of the irrigation pipe 4. The drainage pipe 61 is provided with a drainage opening/closing valve 68. The drainage on-off valve 68 is an electrically driven valve capable of prohibiting or permitting the passage of water through the drainage pipe 61, and is composed of an appropriate solenoid valve or electric valve.

The control device 5 is electrically connected to the spray opening/closing valve 28, the irrigation opening/closing valve 48, and the drainage opening/closing valve 68. The control device 5 has a normal mode and a rapid mode as modes for controlling the water draining operation.

The user selects a mode through the input unit 55, for example. When the normal mode is selected, the control device 5 maintains the pump 81 in the stopped state and opens the spray opening/closing valve 28 and the irrigation opening/closing valve 48. At this time, the drainage on-off valve 68 remains closed. As a result, drainage is performed through the large number of irrigation holes 425 of the irrigation tube 42.

When the rapid mode is selected, the control device 5 maintains the pump 81 in the stopped state and opens the spray opening/closing valve 28, the irrigation opening/closing valve 48, and the drainage opening/closing valve 68. As a result, more rapid drainage is performed through the multiple irrigation holes 425 of the irrigation tube 42 and the drain pipe 61.

Switching between the normal mode and the rapid mode is not limited to being performed based on a user input, and may be automatically performed based on, for example, the outside air temperature. In this case, when the control device 5 determines that the outside air temperature detected by the outside air temperature sensor 96 is lower than the predetermined temperature, the quick mode may be selected, or the winter mode may be selected based on the calendar information. The rapid mode may be selected when it is determined that there is.

FIG. 6 schematically shows a second modified example of the water supply device 1 according to the embodiment. In the second modified example, the water supply device 1 does not include the irrigation pipe 4, but instead includes the drain pipe 71 and the drain opening/closing valve 78. In the second modification, the drainage pipe 71 is connected to the lower portion of the vertical pipe 21 of the spray pipe 2. The drainage on-off valve 78 interposed in the flow path of the drainage pipe 71 is located below the spraying on-off valve 28 interposed in the flow path of the vertical pipe 21.

The control device 5 is electrically connected to the spray opening/closing valve 28 and the drainage opening/closing valve 78. When the user inputs an instruction of the water draining operation, the controller 5 executes the water draining operation by maintaining the pump 81 in the stopped state and opening the spray opening/closing valve 28 and the drain opening/closing valve 78. Let

Also in the second modification, when the spray on-off valve 28 and the drainage on-off valve 78 are opened, the water on the vertical pipe 21 side first drops while drawing air into the vertical pipe 21 through the first air introduction valve 3a. Then, it is discharged to the outside through the drain pipe 71. The water on the side of the horizontal pipe 22 is sequentially discharged to the side of the vertical pipe 21 while drawing the air into the horizontal pipe 22 through the second air introduction valve 3b after the water on the side of the vertical pipe 21 starts to drop. Go

FIG. 7 schematically shows a third modification of the water supply device 1 according to the embodiment. In the third modification, the first air introduction valve 3a is connected to the horizontal pipe 22 instead of the vertical pipe 21. The portion of the horizontal pipe 22 to which the first air introduction valve 3a is connected is the portion of the plurality of spray nozzles 25 to which the spray nozzle 25 closest to the pump 81 is connected, and the spray nozzle 25 is next to the pump 81. It is located between the spray nozzle 25 and the location where it is connected.

That is, in the third modification, not all of the plurality of spray nozzles 25 are located between the first air introduction valve 3a and the second air introduction valve 3b, but some of the plurality of spray nozzles 25 are located. doing.

Also in the third modified example, when the spray opening/closing valve 28 and the irrigation opening/closing valve 48 are opened, the water remaining in the spraying pipe 2 passes through the air introduced through the first air introducing valve 3a. Of the divided water, the water on the vertical pipe 21 side quickly flows down the vertical pipe 21. Next, of the divided water, the water on the side of the horizontal pipe 22 is discharged through the vertical pipe 21 and the irrigation pipe 4.

The location of the horizontal pipe 22 to which the first air introduction valve 3a is connected is not limited to this. For example, in the horizontal pipe 22, between the location where the spray nozzle 25 closest to the pump 81 is connected and the location where the spray nozzle 25 closest to the pump 81 is connected to the pump 81, One air introduction valve 3a may be connected, or may be connected to another place.

Further, the number of the air introduction valves 3 is not limited to two, and an additional air introduction valve 3 may be connected to the spray pipe 2. For example, in the third modification, the additional air introduction valve 3 may be connected to the vertical pipe 21 or may be connected to another portion of the horizontal pipe 22.

FIG. 8 schematically shows a fourth modified example of the water supply device 1 according to the embodiment. In the fourth modified example, the horizontal pipe 22 has an inclination such that a position further away from the vertical pipe 21 is positioned on the upper side. As an example, when the inclination ratio of the lateral pipe 22 is 0.4/100 and the length of the lateral pipe 22 is 50 m, the height difference d between both ends of the lateral pipe 22 is 0.2 m. The inclination of the lateral pipe 22 does not have to be a uniform inclination over the entire length, and may be an inclination as a whole.

Also in the fourth modified example, when the spray on-off valve 28 and the irrigation on-off valve 48 are opened, the water remaining in the spray pipe 2 passes through the air introduced through the first air introduction valve 3a. Of the divided water, the water on the vertical pipe 21 side quickly flows down. Next, of the divided water, the water on the side of the horizontal pipe 22 flows into the vertical pipe 21. Here, since the horizontal pipe 22 is inclined, the drainage of water on the side of the horizontal pipe 22 is completed more quickly.

Although various modifications of the water supply device 1 according to the embodiment have been described above, in each of the above-described modifications, appropriate design changes may be made within a range in which the same operational effect can be achieved, and each of the above-described modifications. It is naturally possible to apply the configurations in combination.

(Aspect)
As described above, as described based on the embodiment and the various modifications thereof, the water supply device (1) for an agricultural house according to the first aspect has the following configuration. The water supply device (1) for an agricultural house according to the first aspect includes a spray pipe (2), a plurality of spray nozzles (25), a spray on-off valve (28), and two air introduction valves (3). Prepare Water from the pump (81) is supplied to the spray pipe (2). The plurality of spray nozzles (25) are connected to the spray pipe (2) and are located at a distance from each other in the horizontal direction. The spray on-off valve (28) is provided in the spray pipe (2) so as to be interposed between the pump (81) and the plurality of spray nozzles (25). The two air introduction valves (3) are connected to the spray pipe (2) at a position farther from the pump (81) than the spray opening/closing valve (28), and the water pressure in the spray pipe (2) is increased. When the pressure exceeds the predetermined pressure, the valve is closed, and when the pressure becomes lower than the predetermined pressure, the valve is opened to introduce air into the spray pipe (2). The spray pipe (2) is a vertical pipe (21) to which water is supplied from a pump (81) and a horizontal pipe that communicates with an upper portion of the vertical pipe (21) and is connected with a plurality of spray nozzles (25). (22) is included. At least a part of the plurality of spray nozzles (25) is located between the two air introduction valves (3).

According to the water supply device (1) for an agricultural house according to the first aspect, the spray opening/closing valve (28) is opened with the pump (81) stopped, and the spray is performed from the two air introduction valves (3). Water can be drained while introducing air into the piping (2). At this time, the water remaining in the spray pipe (2) is divided by the air introduced into the spray pipe (2). Among them, the water on the vertical pipe (21) side is quickly flowed down and discharged by its own weight, and the water on the horizontal pipe (22) side is discharged through the vertical pipe (21) so as to follow it. Therefore, according to the water supply device (1) for an agricultural house according to the first aspect, the water draining operation can be completed promptly even when the spray pipe (2) is very long and a large pressure loss occurs. You can

The water supply device (1) for an agricultural house according to the second aspect further includes the following configuration in the first aspect. In the water supply device (1) for an agricultural house according to the second aspect, all of the plurality of spray nozzles (25) are located between the two air introduction valves (3).

According to the water supply device (1) for an agricultural house according to the second aspect, the water on the vertical pipe (21) side of the water divided by the air can quickly flow down by its own weight.

The water supply device (1) for an agricultural house according to the third aspect further includes the following configuration in the first or second aspect. In the water supply device (1) for an agricultural house according to the third aspect, the horizontal pipe (22) has an inclination such that a position further away from the vertical pipe (21) is located on the upper side.

According to the water supply device (1) for an agricultural house according to the third aspect, among the water divided by the air, the water on the side of the horizontal pipe (22) is promptly discharged by the inclination of the horizontal pipe (22). You can

The water supply device for an agricultural house according to a fourth aspect is the same as any one of the first to third aspects, further including the following configuration. The water supply device (1) for an agricultural house according to the fourth aspect further includes an irrigation pipe (4) and an irrigation on-off valve (48). The watering pipe (4) communicates with the lower part of the vertical pipe (21) and is used for watering the soil (S). The irrigation on-off valve (48) is provided in the irrigation pipe (4).

According to the water supply device (1) for an agricultural house of the fourth aspect, the spray opening/closing valve (28) and the irrigation opening/closing valve (48) are opened with the pump (81) stopped. Water can be drained while introducing air from the air introduction valve (3) into the spray pipe (2). At this time, the water remaining in the spray pipe (2) is divided by the air introduced into the spray pipe (2). Of these, the water on the vertical pipe (21) side quickly flows down due to its own weight and is discharged through the irrigation pipe (4). Water on the side of the horizontal pipe (22) is discharged through the vertical pipe (21) and the irrigation pipe (4) so as to follow the water. Since the water remaining in the spray pipe (2) can be used for irrigation, the water in the water storage tank can be effectively used.

The water supply device (1) for an agricultural house according to the fifth aspect is the fourth aspect, further including the following configuration. The water supply device (1) for an agricultural house according to the fifth aspect further includes a control device (5) for controlling opening/closing of the spray opening/closing valve (28) and the irrigation opening/closing valve (48). The controller (5) opens the spray opening/closing valve (28) and then opens the irrigation opening/closing valve (48) to execute the water draining operation.

According to the water supply device (1) for an agricultural house according to the fifth aspect, by controlling the opening/closing of the spray opening/closing valve (28) and the irrigation opening/closing valve (48), the water remains in the spray piping (2). The water to be discharged can be automatically and quickly discharged through the irrigation pipe (4).

The water supply device for an agricultural house according to a sixth aspect is any one of the first to fifth aspects, further including the following configuration. The water supply device (1) for an agricultural house according to the sixth aspect further includes a control device (5) that controls the spray opening/closing valve (28) to execute the water draining operation. The control device (5) has an input unit (55) capable of inputting an instruction for a water draining operation.

According to the water supply device (1) for an agricultural house according to the sixth aspect, it is possible to quickly complete the drainage of the spray pipe (2) based on the user's judgment.

The water supply apparatus (1) for an agricultural house according to a seventh aspect is any one of the first to fifth aspects, further including the following configuration. The water supply device (1) for an agricultural house according to the seventh aspect further includes a control device (5) that controls the spray opening/closing valve (28) to execute the water draining operation. The control device (5) causes the water draining operation when the outside air temperature is lower than the predetermined temperature.

According to the water supply device (1) for an agricultural house according to the seventh aspect, it is possible to automatically and promptly complete the drainage of the spray pipe (2) based on the outside air temperature.

1 Water Supply Device 2 Spray Pipe 21 Vertical Pipe 22 Horizontal Pipe 25 Spray Nozzle 28 Spray Open/Close Valve 3 Air Inlet Valve 4 Irrigation Piping 48 Irrigation Open/Close Valve 5 Control Device 55 Input Port 61 Drain Pipe 68 Drain Open/Close Valve 81 Pump S soil

Claims (7)

A spray pipe to which water from the pump is supplied,
A plurality of spray nozzles, which are connected to the spray pipe and are positioned at a distance from each other in the horizontal direction,
A spray opening/closing valve provided in the spray pipe so as to be interposed between the pump and the spray nozzles,
When the spray pipe is connected to a position farther from the pump than the spray opening/closing valve, and is closed when the water pressure in the spray pipe exceeds a predetermined pressure, and when the water pressure is equal to or lower than the predetermined pressure And two air introduction valves that open the valve to introduce air into the spray pipe.
The spray pipe includes a vertical pipe to which water is supplied from the pump, and a horizontal pipe that is connected to an upper portion of the vertical pipe and is connected with a plurality of spray nozzles.
At least a part of the plurality of spray nozzles is located between the two air introduction valves. The water supply device for an agricultural house according to claim 1, wherein all of the plurality of spray nozzles are located between the two air introduction valves. The water supply device for an agricultural house according to claim 1 or 2, wherein the horizontal pipe has an inclination such that a position farther from the vertical pipe is located on an upper side. An irrigation pipe used for irrigating the soil, which communicates with the lower part of the vertical pipe,
The water supply device for an agricultural house according to claim 1, further comprising an irrigation on-off valve provided in the irrigation pipe. Further comprising a control device for controlling the opening/closing of the spray opening/closing valve and the irrigation opening/closing valve,
The water supply device for an agricultural house according to claim 4, wherein the control device executes the water draining operation by opening the irrigation on-off valve after opening the spray on-off valve. Further comprising a control device for controlling the spray opening/closing valve to execute a water draining operation,
The water supply device for an agricultural house according to any one of claims 1 to 5, wherein the control device includes an input unit capable of inputting an instruction for a water draining operation. Further comprising a control device for controlling the spray opening/closing valve to execute a water draining operation,
The water supply device for an agricultural house according to any one of claims 1 to 5, wherein the control device executes the water draining operation when the outside air temperature is lower than a predetermined temperature.

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