Plant cultivation apparatus and cultivation system

Abstract

To provide a plant cultivation device and plant cultivation system that can equalize the temperature and humidity inside a greenhouse. [Solution] The plant cultivation device is positioned above the water tank and has a long trough at its bottom with multiple outlets spaced apart in the longitudinal direction, through which temperature-controlled water is dripped into the water tank. The trough has a pair of side walls that are positioned to approach each other downwards when viewed in a longitudinal cross-section from the longitudinal direction. The plant cultivation system also includes the plant cultivation device described above.

Description

[[Technical Field]]

[0001] The present disclosure relates to a plant cultivation apparatus and cultivation system for use in a plant cultivation house. [[Background Art]]

[0002] As an apparatus capable of adjusting the temperature and humidity of the internal space in a plant cultivation house, Patent Document 1 discloses a cultivation apparatus that sprinkles warm water onto a seedbed and circulates the sprinkled warm water. [[Prior Art Documents]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Publication No. Hei 6-284827 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] However, in the cultivation apparatus of Patent Document 1, the warm water is sprinkled onto the seedbed, and no effective and appropriate means for uniformizing the temperature and humidity of the internal space of the house is provided.

[0005] The present disclosure solves the above-described problem, and an object thereof is to provide a plant cultivation apparatus and a plant cultivation system that can uniformize the temperature and humidity of the internal space of a house. [[Means for Solving the Problem]]

[0006] The plant cultivation apparatus of this disclosure is a plant cultivation apparatus that is placed in the internal space of a greenhouse for plant cultivation and adjusts the temperature or humidity of the internal space by circulating temperature-controlled water, and comprises: a long water tank placed in the lower part of the internal space for storing water to be circulated; a temperature regulator placed inside the water tank for adjusting the temperature of the water stored in the water tank; a long trough placed above the water tank and having a plurality of discharge ports at the bottom that are spaced apart in the longitudinal direction, for dripping temperature-controlled water into the water tank through the discharge ports; and a pump device that sends water whose temperature has been adjusted by the temperature regulator from the water tank, supplies it to the trough, and circulates it by dripping, wherein the trough has a pair of side walls that are arranged to approach each other downward when viewed in a longitudinal cross-section from the longitudinal direction.

[0007] According to the plant cultivation device of this disclosure, the temperature and humidity inside the greenhouse can be made uniform.

[0008] In one embodiment of the present disclosure, a pair of air guide plates are arranged on the outside of the pair of side walls such that a gap is formed between each side wall that gradually narrows downward.

[0009] According to one aspect of this disclosure, the temperature and humidity inside the greenhouse can be made uniform in a short time.

[0010] In one embodiment of the present disclosure, the water storage tank is provided with a pair of air circulation plates arranged on both sides of the water dripping area, in a longitudinal cross-sectional view from the longitudinal direction, so as to expand downward toward each other.

[0011] According to one aspect of this disclosure, it is possible to promote the homogenization of temperature and humidity in the interior space of a greenhouse.

[0012] In one embodiment of the present disclosure, the discharge port is provided with a nozzle having a vertical communication hole, and the nozzle is formed such that its upper end is located a predetermined distance above the bottom.

[0013] According to one aspect of this disclosure, it is possible to make the temperature and humidity of the internal space of the greenhouse uniform along the longitudinal direction of the cultivation device.

[0014] In one aspect of the present disclosure, a pair of weirs are provided in the longitudinal direction, flanking a plurality of discharge ports, for storing water discharged from the pump device up to a predetermined amount.

[0015] According to one aspect of this disclosure, it is possible to promote the uniformity of temperature and humidity in the internal space of the greenhouse along the longitudinal direction of the cultivation device.

[0016] In one embodiment of the present disclosure, the pumping device has two or more pumps, and each of the two or more pumps has an inlet for water discharged from it, and the inlets are formed at different positions in the longitudinal direction.

[0017] According to one aspect of this disclosure, it is possible to equalize the temperature and humidity of the internal space of the greenhouse along the longitudinal direction of the cultivation device.

[0018] The plant cultivation system of the present disclosure comprises the cultivation device described above, and a partition wall that extends in the longitudinal direction, is erected at a distance from the cultivation device, defines a plant cultivation space between itself and the cultivation device, and guides air flowing from the cultivation device towards the cultivation space from below upward.

[0019] According to the plant cultivation system of this disclosure, it is possible to generate circulating airflow in the cultivation space, which promotes the homogenization of temperature and humidity inside the greenhouse. [Effects of the Invention]

[0020] According to this disclosure, the temperature and humidity inside the greenhouse can be made uniform. [Brief explanation of the drawing]

[0021] [Figure 1] Figure 1 is a schematic diagram showing a plant cultivation apparatus according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1. [Figure 3] FIG. 3 is a schematic exploded cross-sectional view showing the configuration of a nozzle of the plant cultivation apparatus according to the embodiment. [Figure 4] FIG. 4 is a schematic diagram showing a part of a gutter of the plant cultivation apparatus according to the embodiment. [Figure 5] FIG. 5 is a schematic diagram showing a modified example of the gutter of the plant cultivation apparatus according to the embodiment. [Figure 6] FIG. 6 is a schematic diagram showing another modified example of the gutter of the plant cultivation apparatus according to the embodiment. [Figure 7] FIG. 7 is a schematic diagram showing the plant cultivation system according to the embodiment. MODE FOR CARRYING OUT THE INVENTION

[0022] Hereinafter, a plant cultivation apparatus and a plant cultivation system which are one embodiment of the present disclosure will be described with reference to the drawings.

[0023] FIG. 1 and FIG. 2 are schematic diagrams showing the overall structure of a plant cultivation apparatus 10. The plant cultivation apparatus 10 is disposed in the inner space of a plant cultivation house GH, and adjusts the temperature and humidity of the inner space of the house GH by circulating water.

[0024] The plant cultivation apparatus 10 includes a water storage tank 12, a pump device 14, and a gutter 16. The water storage tank 12 and the gutter 16 are supported by pillars 18a and beams 18b of a frame body 18 such that the gutter 16 is positioned above the water storage tank 12. The length of the pillars 18a of the frame body 18 is adjustable. The plant cultivation apparatus 10 is formed such that the height of the gutter 16 can be adjusted by adjusting the length of the pillars 18a.

[0025] The water storage tank 12 is disposed at a lower portion of the inner space of the house GH. The water storage tank 12 is formed in an elongated shape, and has an open upper surface. The water storage tank 12 stores water to be circulated in the cultivation apparatus 10.

[0026] Multiple temperature regulators 20 are arranged inside the water storage tank 12. The temperature regulators 20 are designed to adjust the temperature of the water stored in the water storage tank. That is, the temperature regulators 20 are designed to heat or cool the water stored in the water storage tank 12. Although not limited to them, electric heaters or coolers can be used as temperature regulators 20.

[0027] The pump device 14 is a fluid machine that circulates water between the water storage tank 12 and the trough 16. The pump device 14 sends water whose temperature has been adjusted by the temperature controller 20 from the water storage tank 12 and supplies it to the trough 16, where it is circulated by dripping. The pump device 14 has one or more pumps, preferably two or more pumps, for example, a first pump 14a and a second pump 14b as shown in Figure 2. The water sent from the pump device 14 is injected into the trough 16 via a water supply pipe 22 connected between the pump device 14 and the trough 16. The amount of water sent from the pump device 14 may be adjusted by switching the start and stop of the pump device 14's drive, or by providing an inverter motor (not shown) in the pump device 14 and controlling the rotation speed of the inverter motor.

[0028] The heating or cooling of water by the temperature controller 20 and the driving of the pump device 14 are controlled by a control device 24 that is wirelessly or wiredly connected to the temperature controller 20 and the pump device 14. The control device 24 is equipped with, but is not limited to, a microcomputer or the like. A sensor device 26, which is placed at any position in the internal space of the greenhouse GH and detects the temperature or humidity of the internal space, is wirelessly or wiredly connected to the control device 24. The control device 24 is configured to switch the start and stop of the heating or cooling of water by the temperature controller 20 and the driving of the pump device 14 based on the temperature or humidity information detected by the sensor device 26. If an inverter motor is provided for the pump device 14, the control device 24 may also control the rotation speed of the inverter motor based on the temperature or humidity information detected by the sensor device 26. In addition, although the temperature controller 20 and the pump device 14 in Figure 1 are controlled by the same control device 24, they may be controlled by two or more control devices 24 in separate systems, or two or more control panels may be provided inside the control device 24 to control them in separate systems.

[0029] The trough 16 is positioned above the water storage tank 12. The trough 16 is elongated and has multiple discharge ports 16a1 spaced apart along its length at its bottom 16a. The trough 16 is designed to allow water sent from the pump device 14 to drip into the water storage tank 12 via the discharge ports 16a1. As shown in Figure 1, a return pipe 28 may be provided in the trough 16 to return excess water injected into the trough 16 back to the water storage tank 12.

[0030] Furthermore, a nozzle 30 is preferably provided at the discharge port 16a1. Details of the nozzle 30 and the internal structure of the trough 16 in which the nozzle 30 is provided will be described later.

[0031] The gutter 16 has a pair of side wall portions 16b that are arranged to approach each other downwards when viewed in a longitudinal section from the longitudinal direction of the gutter 16. In the gutter 16, as shown in Figure 2, the pair of side wall portions 16b may be formed to have a trapezoidal longitudinal section in which the lower side is shorter than the upper side, or the pair of side wall portions 16b may be formed to have an inverted triangular longitudinal section. Also, in Figure 2, the side wall portions 16b are formed to be straight in a longitudinal section view, but they may be formed to be curved in a convex shape toward the inside of the gutter 16.

[0032] On the outside of the pair of side wall portions 16b, preferably, a pair of air guide plates 32 are arranged such that a gap is formed between each side wall portion 16b, with the gap gradually narrowing downwards. That is, the plant cultivation device 10 preferably further comprises a pair of air guide plates 32 arranged on either side of the pair of side wall portions 16b. The pair of air guide plates 32 are arranged opposite the pair of side wall portions 16b. The air guide plates 32 are supported by the frame 18, for example, by being fixed to the upper end of the support column 18a and resting across the beam 18b. Note that in Figure 1, for illustrative purposes, the air guide plate on the side of the gutter 16 that is in front of the page is omitted, and the pair of air guide plates 32 are shown only in Figure 2.

[0033] In Figure 2, the air guide plate 32 is formed to have a straight shape in a vertical cross-sectional view, but it can be shaped to correspond to the shape of the side wall portion 16b of the gutter 16. For example, if the side wall portion 16b is formed to have a convex curved shape toward the inside of the gutter 16, the air guide plate 32 can also be formed to have a convex curved shape toward the gutter 16, corresponding to the side wall portion 16b.

[0034] Preferably, each of the pair of air guide plates 32 has a first air guide portion 32a positioned opposite the side wall portion 16b, and a second air guide portion 32b extending downward from the lower end of the first air guide portion 32a. The second air guide portion 32b guides the air guided by the first air guide portion 32a in the direction of water dripping by the dripping of water. The extension width of the second air guide portion 32b can be any width, and it is also possible to omit the second air guide portion 32b and have a configuration with only the first air guide portion 32a.

[0035] Preferably, the water tank 12 is provided with a pair of air circulation plates 34 arranged on both sides of the water dripping area, when viewed in a longitudinal section from the longitudinal direction of the water tank 12, so as to expand downward toward each other. The air circulation plates 34 are connected to the upper end extending in the longitudinal direction of the water tank 12 and are fastened and fixed by means of screws, etc., via angle fittings, although this is not limited to these methods. The upper end portions of the pair of air circulation plates 34 from the connection point on the water tank 12 are positioned above the opening of the water tank 12. The upper ends of the pair of air circulation plates 34 on the water tank 12 are spaced apart from each other. In Figure 2, the air circulation plates 34 are formed to be straight in a longitudinal section, but they may also be formed to be curved in a convex shape toward the inside of the water tank 12.

[0036] Next, the internal structure of the nozzle 30 and the trough 16 will be explained in detail using Figures 3 to 6.

[0037] Figure 3 is an exploded axial cross-sectional view schematically showing the overall structure of the nozzle 30. Figure 4 is a schematic diagram showing an example of the internal structure of the trough 16 in which the nozzle 30 is installed. The nozzle 30 has a nozzle body 30a formed in the shape of a bolt and a fastener 30b formed in the shape of a nut. The nozzle body 30a has a head 30a1 and a body portion 30a2 connected to the head 30a1 and having a smaller diameter than the head 30a1. The nozzle body 30a has a communication hole 30a3 that penetrates the head 30a1 and the body portion 30a2 in the axial direction. The communication hole 30a3 of the head 30a1 is formed so that its diameter gradually decreases toward the body portion 30a2 side and has an inner circumferential surface that is convex in the direction of the communication hole 30a3. A male screw 30a4 is formed on the outer circumference of the nozzle body 30a. The fastener 30b is formed in a hollow columnar shape, and has a female thread 30b1 on its inner surface that can be screwed onto the male thread 30a4 of the nozzle body 30a.

[0038] The nozzle 30 is fastened and fixed to the bottom 16a of the gutter 16 by positioning the head 30a1 of the nozzle body 30a on the upper part of the bottom 16a of the gutter 16, passing the body 30a2 downward from the discharge port 16a1, and screwing a fastener 30b into the body 30a2. When the nozzle 30 is installed in the discharge port 16a1 of the gutter 16, the nozzle 30 has a communication hole 30a3 formed in the vertical direction. Furthermore, because the head 30a1 of the nozzle body 30a is positioned on the upper part of the bottom 16a of the gutter 16, the nozzle 30 is formed so that the upper end of the nozzle 30 is located at a predetermined distance, for example, 2 mm to 10 mm above the bottom 16a of the gutter 16.

[0039] Figure 5 is a schematic diagram showing a modified internal structure of the trough 16. As shown in Figure 5, a pair of weirs 36 are provided in the longitudinal direction of the trough 16, flanking a plurality of discharge ports 16a1. The pair of weirs 36 store water discharged from the pump device 14 up to a predetermined amount. In addition, in the longitudinal direction of the trough 16, the water inlet 22c discharged from the pump device 14 is located outside the pair of weirs 36. The inlet 22c is provided at the trough 16 side end of the water supply pipe 22 connected between the pump device 14 and the trough 16.

[0040] Figure 6 is a schematic diagram showing another modified example of the internal structure of the gutter 16. As shown in Figure 6, a portion of the first water supply pipe 22a connected to the first pump 14a and the second water supply pipe 22b connected to the second pump 14b are located inside the gutter 16. In addition, water inlets 22d for water supplied from the first pump 14a and the second pump 14b are formed inside the gutter 16. One or more inlets 22d are formed at the ends of the first water supply pipe 22a and the second water supply pipe 22b on the gutter 16 side, or in portions of the first water supply pipe 22a and the second water supply pipe 22b located inside the gutter 16. In the longitudinal direction of the gutter 16, the water inlet 22d supplied from the first pump 14a is formed at a different position from the water inlet 22d supplied from the second pump 14b. In other words, the discharge port 16a1 adjacent to the water inlet 22d supplied by the first pump 14a is different from the discharge port 16a1 adjacent to the water inlet 22d supplied by the second pump 14b. As in the modified example described above, the pump device 14 can preferably be configured to have two or more pumps, for example, a first pump 14a and a second pump 14b. Alternatively, water inlets 22d supplied by each of the two or more pumps may be formed inside the trough 16, and the inlets 22d may be formed at different positions along the longitudinal direction of the trough 16.

[0041] Next, the plant cultivation system 100 will be described using Figure 7, which is a schematic diagram showing the overall structure of the plant cultivation system 100 according to an embodiment. The plant cultivation system 100 comprises the plant cultivation device 10 described above and a partition wall 150 that defines the plant cultivation space CS between the cultivation device 10 and the partition wall 150. The partition wall 150 extends in the longitudinal direction of the cultivation device 10 and is erected at a distance from the cultivation device 10. The distance between the partition wall 150 and the cultivation device 10 can be arbitrarily determined according to the type of plant P, etc. For example, if the plant P is a coffee tree, the distance between the partition wall 150 and the cultivation device 10 is set to approximately 2m. The partition wall 150 is not limited to, but for example, it is formed as a glass plate or a vinyl sheet. Alternatively, the partition wall 150 may be a vinyl sheet that constitutes a greenhouse GH.

[0042] Next, the operation and effects of the plant cultivation device 10 and cultivation system 100 according to the embodiment will be described.

[0043] The plant cultivation device 10 operates through temperature control by a temperature controller 20 and the operation of a pump device 14. The temperature control by the temperature controller 20 adjusts the temperature of the water stored in the water tank 12, and the operation of the pump device 14 sends the temperature-adjusted water from the water tank 12 to the trough 16. The temperature-adjusted water sent from the water tank 12 flows into the trough 16, and the water that flows into the trough 16 drips out from multiple outlets 16a1 of the trough 16. The dripped water is stored in the water tank 12 and its temperature is adjusted by the temperature control by the temperature controller 20. In the plant cultivation device 10, the above operation is repeated.

[0044] The plant cultivation device 10 of this embodiment is positioned above the water storage tank 12 and has a long trough at its bottom 16a with multiple discharge ports 16a1 spaced apart in the longitudinal direction, through which temperature-controlled water CW is dripped into the water storage tank 12. The trough 16 also has a pair of side wall portions 16b that are arranged to approach each other downwards when viewed in a longitudinal cross-section from the longitudinal direction of the trough 16.

[0045] In the plant cultivation device 10 of this embodiment, water is dripped in rows from the trough 16 along its longitudinal direction. The dripping of water from the trough 16 creates negative pressure near the bottom 16a of the trough 16, and an airflow flows from top to bottom along the pair of side walls 16b due to the Coanda effect. The airflow flowing from top to bottom along the pair of side walls 16b collides with the dripping water near the bottom 16a of the trough 16 and flows downward along the dripping water. At this time, the collision of the airflow with the dripping water causes the moisture-containing air to disperse into the cultivation space CS.

[0046] Therefore, in the plant cultivation device 10 of this embodiment, by having a pair of side walls 16b arranged to be close to each other and facing downwards, moisture-containing air can be dispersed into the cultivation space CS, and the temperature and humidity of the internal space of the greenhouse GH can be made uniform.

[0047] Furthermore, the plant cultivation device 10 of this embodiment can be configured such that a pair of air guide plates 32 are arranged on the outside of a pair of side wall portions 16b, preferably such that a gap is formed between each side wall portion 16b that gradually narrows downwards.

[0048] As the gap between the pair of air guide plates 32 and the side wall portion 16b gradually narrows downwards, the velocity of the airflow flowing from top to bottom along the pair of side wall portions 16b, generated by the Coanda effect, increases. This increase in the velocity of the airflow flowing from top to bottom increases the amount of moisture in the air dispersed in the cultivation space CS due to the collision of the airflow with the dripping water. Furthermore, the increase in the velocity of the airflow flowing from top to bottom increases the amount of moisture-containing airflow flowing in the direction of water dripping, thus promoting the dispersion of moisture-containing air in the lower part of the cultivation space CS.

[0049] Therefore, in the plant cultivation apparatus 10 of this embodiment, by gradually reducing the gap between the pair of air guide plates 32 and the side wall portion 16b in the direction of water dripping, it is possible to make the temperature and humidity of the internal space of the greenhouse GH uniform in a short time.

[0050] Furthermore, in the plant cultivation device 10 of this embodiment, when viewed in a longitudinal cross-section from the longitudinal direction of the water storage tank 12 or the gutter 16, a pair of air circulation plates 34 can be provided in the water storage tank 12, arranged on both sides of the area where water drips, so as to expand downward toward each other.

[0051] By arranging the pair of air circulation plates 34 to open downwards toward each other, the moisture-containing airflow can be guided away from the plant cultivation device 10 below the cultivation space CS, thereby promoting the generation of circulating airflow in the cultivation space CS.

[0052] Therefore, this configuration promotes the homogenization of temperature and humidity within the interior space of the greenhouse GH.

[0053] Furthermore, in the plant cultivation device 10 of this embodiment, the upper ends of the pair of air circulation plates 34, from the connection point with the water tank 12, are positioned above the opening of the water tank 12. The upper ends of the pair of air circulation plates 34 in the water tank 12 are spaced apart from each other, and water dripping from between the pair of air circulation plates 34 collides with the water stored in the water tank 12, causing splashing. However, with this configuration, the splashed water collides with the lower part of the pair of air circulation plates 34 and is returned to the water tank 12, thus suppressing the depletion of water stored in the water tank 12 due to splashing.

[0054] Therefore, this configuration makes it possible to suppress the depletion of water stored in the water tank 12, thereby improving the operating efficiency of the plant cultivation device 10.

[0055] Furthermore, in the plant cultivation device 10 of this embodiment, a nozzle 30 with a vertically oriented communication hole 30a3 is provided at the discharge port 16a1 of the trough 16, and the upper end of the nozzle 30 can be formed to be located a predetermined distance above the bottom 16a of the trough 16.

[0056] With this configuration, as shown in Figure 4, the temperature-controlled water CW is stored in the trough 16 from the upper end of the nozzle 30 to an upper position, and then dripped downward through the communication hole 30a3, so that the amount of water dripped from each nozzle 30 can be made uniform. Therefore, with this configuration, the amount of water dripped from the discharge port 16a1 can be made uniform regardless of the distance from the inlet port 22c to the discharge port 16a1, so that the temperature and humidity of the internal space of the greenhouse GH can be made uniform along the longitudinal direction of the cultivation device 10.

[0057] Furthermore, in the plant cultivation device 10 of this embodiment, by providing a pair of weirs 36 arranged in the longitudinal direction of the trough 16, flanking a plurality of discharge ports 16a1, the temperature-controlled water CW sent from the pump device 14 can be stored up to a predetermined amount.

[0058] With this configuration, a predetermined amount of temperature-controlled water CW can be stored between the pair of weirs 36, and the water pressure of the stored temperature-controlled water CW can maintain a uniform amount of water dripping from each outlet 16a1. Therefore, with this configuration, the uniformity of temperature and humidity in the internal space of the greenhouse GH along the longitudinal direction of the cultivation device 10 can be promoted.

[0059] Furthermore, in the plant cultivation apparatus 10 of this embodiment, the pump apparatus 14 can be configured to have two or more pumps, for example, a first pump 14a and a second pump 14b. Then, water inlets 22d for water delivered from each of the two or more pumps can be formed inside the trough 16 at different positions along the longitudinal direction of the trough 16.

[0060] With this configuration, the amount of water dripped from each outlet 16a1 can be maintained uniformly, thereby enabling uniform temperature and humidity in the internal space of the greenhouse GH along the longitudinal direction of the cultivation device 10.

[0061] Furthermore, in the plant cultivation system 100 of this embodiment, a partition wall 150 can be provided that extends in the longitudinal direction of the water tank 12 or the trough 16, is erected at a distance from the cultivation device 10, defines a plant cultivation space CS between the cultivation device 10 and the partition wall 150, and guides the air flowing from the cultivation device 10 toward the cultivation space CS from below upward.

[0062] With this configuration, the partition wall 150 causes the moisture-containing airflow flowing away from the cultivation device 10 in the cultivation space CS to collide with the partition wall 150 and disperse within the cultivation space CS. Furthermore, the moisture-containing airflow flowing below the cultivation space CS can be guided upward by the partition wall 150, thereby promoting the generation of circulating airflow. Therefore, this configuration promotes the homogenization of temperature and humidity in the cultivation space CS.

[0063] Furthermore, by forming a cultivation space CS between the cultivation device 10 and the partition wall 150, it is possible to prevent water dripping from the gutter 16 from directly hitting the plants P, thereby preventing the fruits of the plants P from splitting.

[0064] In the above-described embodiment, the pump device 14 is located inside the water storage tank 12, but it may also be located in a sump at the end of the water storage tank 12 to store water from the water storage tank 12.

[0065] Furthermore, in the above-described embodiment, it is also possible to adjust the amount of water dripped by blocking the communication hole 30a3 of the nozzle 30 with a rubber stopper or the like.

[0066] Furthermore, in the above-described embodiment, it is possible to provide a water level sensor or a surveillance camera as a sensor device 26 for monitoring the water level in the water storage tank 12. It is also possible to configure the control device 24 to perform control to prevent the pump device 14 from running dry due to the depletion of water in the water storage tank 12, based on the information from the water level sensor or surveillance camera. [Explanation of Symbols]

[0067] 10 Cultivation device, 12 Water tank, 14 Pump device, 14a First pump, 14b Second pump, 16 Tunnel, 16a Bottom, 16a1 Outlet, 16b Side wall, 18 Frame, 18a Support column, 18b Beam, 20 Temperature controller, 22 Water supply pipe, 22a First water supply pipe, 22b Second water supply pipe, 22c Inlet, 22d Inlet, 24 Control device, 26 Sensor device, 28 Refrigeration pipe, 30 Nozzle, 30a Nozzle body, 30a1 Head, 30a2 Body, 30a3 Communication hole, 30a4 Male screw, 30b Fastener, 30b1 Female screw, 32 Air guide plate, 32a First air guide section, 32b Second air guide section, 34 Air circulation plate, 36 Weir, 100 Cultivation system, 150 partitions.

Claims

1. A plant cultivation device that is placed inside a greenhouse for plant cultivation and adjusts the temperature or humidity of the inside space by circulating temperature-controlled water, A long, rectangular water tank is located at the bottom of the aforementioned internal space and stores the water to be circulated. A temperature regulator is placed inside the water storage tank to adjust the temperature of the water stored in the water storage tank, A long trough is positioned above the water storage tank and has multiple outlets at its bottom, spaced apart in the longitudinal direction, through which temperature-controlled water is dripped into the water storage tank. A pump device that sends water whose temperature has been adjusted by the temperature regulator from the water storage tank, supplies it to the trough, and circulates it by dripping. Equipped with, The gutter has a pair of side walls that, when viewed in a longitudinal cross-section from the longitudinal direction, are arranged to approach each other downwards. A plant cultivation device.

2. A pair of air guide plates are arranged on the outside of the pair of side walls such that a gap is formed between each side wall, with the gap gradually narrowing downwards. A plant cultivation apparatus according to claim 1.

3. The water storage tank is provided with a pair of air circulation plates arranged to expand downwards from each other on both sides of the area where water drips, when viewed in a longitudinal cross-section from the longitudinal direction. A plant cultivation apparatus according to claim 1 or 2.

4. The aforementioned discharge port is provided with a nozzle having a communication hole formed in the vertical direction, The nozzle is formed such that its upper end is located a predetermined distance above the bottom. A plant cultivation apparatus according to claim 1 or 2.

5. In the longitudinal direction, a pair of weirs are provided, arranged on either side of the multiple discharge ports, to store the water discharged from the pump device up to a predetermined amount. A plant cultivation apparatus according to claim 1 or 2.

6. The pumping device has two or more pumps, Inside the aforementioned gutter, water inlets are formed for water supplied from each of the two or more pumps. In the longitudinal direction, the inlets are formed at different positions. A plant cultivation apparatus according to claim 1 or 2.

7. A plant cultivation apparatus according to claim 1 or 2, A partition wall extends in the longitudinal direction, is erected at a distance from the cultivation device, defines the plant cultivation space between it and the cultivation device, and guides the air flowing from the cultivation device towards the cultivation space from below upward. Equipped with A plant cultivation system.

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