JP4893502B2 - Humidified air flow supply system to each stage of the growth shelf of the multi-stage plant growing device - Google Patents

Description

  The present invention provides a humidified air flow to each stage of a growth shelf of a multistage growth shelf module installed in a closed structure that is not affected by the external environment equipped with an artificial lighting device, an air conditioning device, and a carbon dioxide supply device. The present invention relates to a system that can be effectively and efficiently supplied.

Patent Document 1 (WO 2005/000005) is a multi-stage plant growing apparatus equipped with a multi-stage plant growing shelf in an internal space of a closed structure and equipped with an artificial lighting device, an air conditioner, and a carbon dioxide supply device. And a device as described in Japanese Patent Application Laid-Open No. 2002-291349 and the like are known. This apparatus will be described with reference to FIG. 7. A multistage growth shelf module 4 in which a plurality of growth shelves 3 are arranged in the vertical direction is installed in a closed structure 1 surrounded by a light shielding heat insulating wall 2. The rear surface of each stage of the growth shelf 3 is provided with an artificial lighting device 5 for irradiating light to a cell tray (not shown) in which a plant growth medium placed on the lower stage is placed. An air conditioner 7 for adjusting the temperature and humidity of the atmosphere in the closed structure 1 is provided on the back of each stage by providing a fan 6 that sucks an air flow from the front of each stage and generates an air flow in each stage. It has a structure in which a carbon dioxide supply device 8 for adjusting the carbon dioxide concentration of the atmosphere is installed in the closed structure 1.
In the illustrated example, two multi-stage growth shelf modules 4 are arranged in the closed structure 1 with their open fronts facing each other, and are indicated by arrows by fans 6 provided on each growth shelf. Air flow is generated in each stage of the growing shelf. The space between the two growing shelf modules 4 can be used as a work space.

In such a multi-stage plant growing device, although not shown in FIG. 7, a bottom watering device is disposed at each stage of the growing shelf 3. There are various shapes and types of bottom watering devices, but generally there is a watering tray on which multiple cell trays containing plant growth media can be placed, and a water supply port and a water discharge port are provided on the watering tray. Structure. Although the opening formed in the bottom of the irrigation tray is used as the drainage port, there are various types as the water supply port. For example, (a) type that feeds nutrient solution (culture solution containing fertilizer) from the opening formed on the bottom of the brine tray, (b) type that feeds nutrient solution from the tip opening of the water supply pipe extended into the brine tray (C) A type in which a water supply pipe in which a plurality of small holes are formed is disposed on the bottom of the irrigation tray and the nutrient solution is supplied from the small holes is used. In this specification, the term “water supply port” of the bottom watering device is not limited to the “opening” formed on the bottom surface of the watering tray in (a), but also “bathlet opening on the water supply pipe” in (b) and (c). “Multiple holes in the water supply pipe” is also used as a generic term.
By using the bottom surface irrigation device, the nutrient solution supplied from the water supply port to the irrigation tray is set to a predetermined water level, irrigation is performed from the bottom surface of the cell tray, and the remaining nutrient solution is discharged from the drain port as drainage. Such irrigation operation is intermittently performed as necessary during the plant growing period.

  An example of the supply / discharge system for supplying / discharging the nutrient solution to / from the bottom irrigation device of each stage of the growth shelf 3 of the multistage type growth shelf module 4 will be described with reference to FIG. FIG. 8 is a view of one of the multistage-type growth shelf modules 4 arranged facing each other in FIG. 7 as viewed from the open front side. The artificial lighting device 5 at each stage of the growth shelf 3 shown in FIG. The fan 6 is not shown. Also, the same components as those in FIG. The nutrient solution is stored in a nutrient solution tank 10 installed outside the closed structure 1 and is supplied by the pump P to the water supply port 13 of the bottom watering device at each stage of the growth shelf 3 through the nutrient solution supply pipe 11. The The nutrient solution supply pipe 11 and the water supply port 13 of each stage are connected via a branch pipe 12 branched from the nutrient solution supply pipe 11.

  The nutrient solution supplied from the water supply port 13 to the bottom watering device of each stage of the growth shelf 3 is watered from the bottom surface of a cell tray (not shown) placed on the bottom watering device and grows a plant planted in the cell. To be served. The remaining nutrient solution is discharged from the drain port 14 of the bottom irrigation device to the drainage return pipe 16 via the drainage pipe 15, and the drainage liquid from the drainage port 14 at each stage is collected in the drainage return pipe 16. It is led below the growth shelf 3 at the bottom of the growth shelf module 4. The lower end of the drainage return pipe 16 is connected to a drainage return horizontal pipe 17 disposed horizontally, and the drainage return horizontal pipe 17 is connected to the nutrient solution tank 10. Thus, the drainage liquid from each stage of the growth shelf 3 is returned to the nutrient solution tank 10 through the drain port 14, the drainage pipe 15, the drainage return pipe 16, and the drainage return horizontal pipe 17, and is reused after adjusting the components. Is done.

  As taught in Patent Document 1, the multistage plant growing apparatus is also used for raising grafted seedlings. In the raising of the grafted seedling, first, the rootstock and the hogi are raised separately on the growing shelf, then the rootstock and the hogi are cut and joined together to make the grafted seedling. The obtained grafted seedlings are also planted on a growing shelf, and the grafted seedlings are grown in a high humidity environment with a relative humidity of nearly 100% in order to promote the grafting of the grafted seedlings immediately after grafting. Is required. In patent document 1, it has the box shape without the baseplate which consists of transparent acrylic resins, for example as shown in FIG. 9 in the curing period of the grafted seedling which requires a high-humidity environment, and includes a plurality of vent holes 31. As shown in FIG. 10, the grafted seedlings 33 planted on the cell tray 32 of the bottom watering device disposed on each stage of the growth shelf 3 of the multi-stage plant growing apparatus are covered with the transparent shield 30. ing. Thereby, the inside of the translucent shield 30 can be made into a high humidity environment by the water | moisture content evaporated from the grafted seedling or the culture medium. On the other hand, carbon dioxide gas is required for the photosynthesis of the grafted seedling 33, but each of the seedling shelves 3 by the fan 6 is passed through a plurality of vent holes 31 having a size that does not impair the high humidity state inside the translucent shield 30. Gas exchange is performed by the air flow generated in the stage, and the carbon dioxide-containing atmosphere in the closed structure 1 can be supplied into the translucent shield 30.

International Publication WO2005 / 000005 JP 2002-291349 A

  As shown in FIG. 10, by covering the seedlings raised in each stage of the growing shelf with the light-transmitting shielding material 30, the moisture evaporated from the seedlings and the culture medium is confined in the light-transmitting shielding material 30, and the high humidity Can bring environment. However, for example, the curing period of the grafted seedling is a short period of several days immediately after the grafting, and if the inside of the translucent shield 30 is made into a high-humidity environment only by moisture evaporation from the grafted seedling and the culture medium, it takes a short time. It may be difficult to perform the desired environmental adjustment, and it is desired to achieve a quicker high-humidity environment.

  In addition, a humidifier is installed in the closed structure 1, and the entire atmosphere in the closed structure is made high humidity. It is also possible to bring about a humidity environment. However, when humidifying the entire atmosphere in a closed structure with a humidifier, a large humidifier or a large number of humidifiers are required, which is not efficient. Furthermore, a temperature sensor installed in the closed structure In addition, the detection element of the humidity sensor is likely to be deteriorated by a high humidity environment, and it becomes impossible to use an inexpensive home air conditioner, and it is necessary to use a commercial refrigerator corresponding to the high humidity environment.

  Therefore, the present invention can supply a humidified air flow quickly and efficiently to each stage of the growth shelf of the multi-stage plant growing apparatus as needed, and also simplifies the installation of a supply pipe for the humidified air flow. It is an object of the present invention to provide a new and improved humidified air flow supply system capable of

That is, the humidified airflow supply system to each stage of the growth shelf of the multi-stage plant growth apparatus of the present invention has at least a plurality of stages of growth racks arranged vertically in a closed structure surrounded by a light-shielding heat insulating wall. One multi-stage growth shelf module, an air conditioner that regulates and regulates the atmosphere in the closed structure, and a carbon dioxide supply device that adjusts the carbon dioxide concentration in the atmosphere; A bottom irrigation device having a water supply port and a drain port that can be placed on a plurality of cell trays containing a plant growth medium and can be intermittently irrigated from the bottom surface of the cell tray is disposed on each stage of the growth shelf; An artificial lighting device for irradiating light to the cell tray placed on the lower stage of each stage is provided on the back surface of each stage;
A fan that sucks an air flow from the front of each stage and generates an air stream at each stage is provided on the back of each stage of the growing shelf; the atmosphere that is temperature-controlled and adjusted in carbon dioxide concentration is used as the air stream In the multi-stage plant growing apparatus that can be supplied to each stage of the growing shelf: a humidifying apparatus that sucks the temperature-controlled and controlled atmosphere in the closed structure and adjusts the concentration of carbon dioxide gas and sends it out as a humidified air flow Is installed in the closed structure; feed water of a bottom watering device in which nutrient solution is disposed by pump from a nutrient tank installed outside the closed structure on each stage of the growth shelf in the closed structure A nutrient solution supply pipe to be supplied to the drainage solution; collecting drainage discharged from the drain port of the bottom irrigation device arranged at each stage of the growth shelf and leading the solution downward to the bottom growth shelf of the growth shelf module Connected to the return pipe and the lower end of the drainage return pipe A drainage return horizontal pipe for returning the drainage liquid to the nutrient solution tank is provided; a U-shaped liquid reservoir is formed in the drainage return horizontal pipe near the nutrient solution tank; and sent from the humidifier The humidified air flow conduit for guiding the humidified air flow is connected to the upstream end of the drainage return horizontal pipe upstream of the U-shaped liquid reservoir.

In a preferred embodiment of the present invention, the upper end on the upstream side of the U-shaped liquid reservoir is positioned higher than the upper end on the downstream side.
Further, in addition to the humidified air flow conduit for guiding the humidified air flow delivered from the humidifier, an additional humidified air flow conduit is separately provided and connected to the upper end of the drainage return pipe of the uppermost growth shelf of the growth shelf module. You may do it.

According to the humidified air flow supply system of the present invention, the brazing water is stopped by a very simple piping configuration in which the humidified air flow conduit for guiding the humidified air flow sent from the humidifier is connected to the upstream end of the drainage return horizontal pipe. If a humidified air flow is sometimes sent from the humidifier, the humidified air flow from the drainage port of the bottom irrigation device to each stage of the growth shelf via the drainage return horizontal pipe, drainage return pipe, and drainage pipe where no drainage flows Can be dispensed. In other words, the drainage return horizontal pipe, drainage return pipe and drainage pipe used in the drainage discharge system from the bottom irrigation device arranged at each stage of the growth shelf are connected to the humidified air to each stage of the growth shelf. Can be shared as a flow supply pipe. As a result, there is no need to separately provide a pipe for distributing and supplying the humidified air flow from the humidifier to each stage of the growth shelf.

  In addition, the upper end on the upstream side of the U-shaped liquid reservoir formed in the middle of the drainage return horizontal pipe is positioned higher than the upper end on the downstream side, so that the drainage is made from the upstream side of the drainage return horizontal pipe. It can be made easy to flow through the U-shaped liquid reservoir to the nutrient solution tank on the downstream side.

  Furthermore, in addition to the humidified air flow conduit for guiding the humidified air flow delivered from the humidifier, an additional humidified air flow conduit is separately provided to supply additional humidified air flow to each stage of the growing shelf of the growing shelf module. Therefore, it is possible to achieve a high humidity environment at each stage of the growing shelf even more quickly.

FIG. 1 is an explanatory view for explaining a basic concept of a humidified air flow supply system according to the present invention to each stage of a growth shelf 3 of a multistage type growth shelf module 4, and is an explanatory view of a conventional nutrient solution supply / discharge system. The same constituent elements as those in FIG.
In the humidified air flow supply system of the present invention shown in FIG. 1, the conventional nutrient solution supply / discharge system shown in FIG. 8 is used, but a humidifier 20 is newly provided inside the closed structure 1. . The humidifier 20 is controlled in humidity by the air conditioner 7 in the closed structure 1 and sucks the atmosphere in the closed structure in which the carbon dioxide gas concentration is adjusted by the carbon dioxide supply device 8. After humidifying the inside, it has a function of sending out humidified air. The humidified air delivered from the humidifier 20 is guided to the humidified air flow conduit 22. The sending / stopping of the humidified air from the humidifier 20 can be performed by rotating / stopping the blower fan 21 provided in the humidifier 20. Further, the drainage return horizontal pipe 17 in the vicinity of the nutrient solution tank 10 is formed with a U-shaped liquid reservoir 23 formed by bending the drainage return horizontal pipe into a U-shape, and upstream of the U-shaped liquid reservoir 23. A humidified air flow conduit 22 is connected to the upstream end 17 a of the drainage return horizontal pipe 17.

The operation of the humidified air flow supply system shown in FIG. 1 will be described below.
The supply and discharge of the nutrient solution to the bottom watering device arranged in each stage of the growth shelf 3 of the multistage type growth shelf module 4 is the same as the operation in FIG. That is, the nutrient solution pumped up from the nutrient solution tank 10 by starting the pump P is guided to the nutrient solution supply pipe 11 and supplied from the water supply port 13 to the bottom irrigation device via the branch pipe 12 to each stage of the growth shelf 3. Is done. The nutrient solution is irrigated from the bottom surface of a cell tray (not shown) placed on the bottom irrigation device, and the remaining nutrient solution is discharged from the drain port 14 of the bottom irrigation device to the drainage return pipe 16 through the drainage pipe 15. Is done. The drainage from the drainage outlet 14 of each stage of the growth shelf 3 is collected in the drainage return pipe 16 and guided to the lower part of the growth shelf at the bottom of the growth shelf module, and further passes through the drainage return horizontal pipe 17 to be U-shaped liquid. It passes through the reservoir 23 and is returned to the nutrient solution tank 10.

  When stopping the irrigation, the pump P is stopped, the supply of the nutrient solution from the nutrient solution tank 10 to the nutrient solution supply pipe 11 is stopped, and all the remaining nutrient solution is discharged from the drain port 14 of the bottom irrigation device. Just do it. At this time, the drainage pipe 15, drainage return pipe 16, and drainage return horizontal pipe 17 at each stage of the growth shelf 3 are substantially free of drainage, but the U-shaped liquid reservoir 23. As shown in the enlarged view of FIG. It is desirable that the drainage return horizontal pipe 17 is slightly inclined toward the nutrient solution tank 10 side so that the drainage can easily return to the nutrient solution tank 10.

  As shown in FIG. 2, the upper end 23a on the upstream side (left side in the drawing) of the U-shaped liquid reservoir 23 is preferably positioned higher than the upper end 23b on the downstream side (right side in the drawing). By doing in this way, since the upstream water head pressure of the U-shaped liquid reservoir 23 becomes higher than the downstream water head pressure, the U-shaped liquid reservoir 23 is moved from the upstream side of the drainage return horizontal pipe 17. The drainage liquid easily flows through the downstream side. When the flow of the drainage is stopped, the liquid is accumulated at a position where the head pressure is equal between the upstream side and the downstream side of the U-shaped liquid reservoir 23.

  When supplying humidified air from the humidifier 20 to each stage of the growth shelf 3 of the growth shelf module 4 in the above-described irrigation stop state, the blower fan 21 of the humidification device 20 is started to activate the atmosphere in the closed structure 1. Performs suction and delivery of humidified air. The sent humidified air is guided to the humidified air flow conduit 22 and is introduced into the drainage return horizontal pipe 17 where the drainage does not flow, but the drainage collected in the U-shaped liquid reservoir 23 (see FIG. 2). ) Prevents distribution. Therefore, the humidified air flow (shown by a dotted line in FIG. 1) in the humidified airflow conduit 22 is guided to the drainage return pipe 16 connected to the drainage return horizontal pipe 17 and rises through the drainage pipe 15. Then, it flows into each stage of the growth shelf from the drain port 14 of the bottom irrigation device arranged on each stage of the growth shelf 3. Thus, the humidified air flow from the humidifying device 20 is distributed and supplied to all the stages of the growing shelf 3, and can give a high humidity environment to the plants grown on the cell trays on each stage of the growing shelf.

  In the humidified air flow supply system of the present invention as described above, the drainage pipe 15, the drainage return pipe 16 and the drainage when the nutrient solution is stopped are used as pipes for supplying the humidified airflow to each stage of the growth shelf. Since the return horizontal pipe 17 is used, it is not necessary to separately provide a supply pipe to each stage of the growing shelf for the humidified air flow.

  In the present invention, since the humidified air flow is supplied only when the nutrient solution is stopped, the pump P that operates during the irrigation and the blower fan 21 of the humidifier 20 that operates when the irrigation stops are set in advance by a timer operation or the like. It is also possible to automatically activate it by a program.

  In the embodiment of FIG. 1, the humidifier 20 may be provided with another additional humidified air flow conduit 25, if necessary, separate from the humidified air flow conduit 22, and this additional humidified air. The flow conduit 25 is connected to the upper end 16 a of the drainage return pipe 16 of the uppermost growth shelf 3 of the growth shelf module 4. By providing such an additional humidified air flow conduit 25, in addition to the humidified air flow (indicated by dotted lines) supplied from the humidifier 20 to each stage of the growth shelf via the humidified air flow conduit 22, additional The humidified air flow (indicated by the alternate long and short dash line) can be additionally supplied to each stage of the growth shelf via the general humidified air flow conduit 25.

  In FIG. 1 showing the basic concept of the present invention, a case where one multi-stage growth shelf module 4 is installed in the closed structure 1 is shown, but FIG. 3 shows a plurality of multi-stage growth shelf modules 4. The Example in the case of installing is shown. Also in FIG. 3, the same reference numerals are assigned to the same components as in FIG.

  FIG. 3 shows an example in which three multi-stage growth shelf modules 4 are arranged in the closed structure 1, and the nutrient solution pumped up by the pump P from the nutrient solution tank 10 is guided to the nutrient solution supply pipe 11. Further, the flow is divided for each growth shelf module 4 and supplied to the water supply port 13 of the bottom watering device disposed in each stage of the growth shelf 3 of each growth shelf module 4 via the branch pipe 12. The remaining nutrient solution used for the bottom irrigation is collected from the drain port 14 of the bottom irrigation apparatus through the drainage pipe 15 to the drainage return pipe 16 for each growth shelf module 4 to grow each growth shelf module 4. The liquid is guided to the lowermost part of the shelf, further collected in the drainage return horizontal pipe 17, passed through the U-shaped liquid reservoir 23, and returned to the nutrient solution tank 10.

  When the pump P is stopped and the supply / discharge of the nutrient solution is stopped, the drainage liquid is discharged into the drainage pipe 15, drainage return pipe 16 and drainage return horizontal pipe 17 at each stage of the growth shelf of each growth shelf module 4. Although it does not substantially remain, the U-shaped liquid reservoir 23 is in a state where the drainage is accumulated as shown in the enlarged view of FIG. In this irrigation stop state, the blower fan 21 of the humidifier 20 is activated to send out the humidified air. The sent humidified air flow (indicated by a dotted line) is guided to the humidified air flow conduit 22 connected to the downstream end 17a of the drainage return horizontal pipe and introduced into the drainage return horizontal pipe 17, but is U-shaped. Circulation is blocked by the drainage accumulated in the liquid reservoir 23. Therefore, the humidified air flow introduced into the drainage return horizontal pipe 17 is guided to the drainage return pipe 16 for each growth shelf module 4 connected to the drainage return horizontal pipe 17 and rises, and the drainage pipe 15 is supplied to each stage of the growing shelf from the drain port 14 of the bottom watering device arranged on each stage of the growing shelf 3.

  Also in the case of FIG. 3, the humidifier 20 can be provided with another additional humidified air flow conduit 25 if necessary, in addition to the humidified air flow conduit 22, and this additional humidified air flow conduit 25. Is branched and connected to the upper end 16a of the drainage return pipe 16 of the uppermost growth shelf of each growth shelf module 4. In addition to the humidified air flow (indicated by the dotted lines) supplied from the humidifier 20 to each stage of the growing shelf 3 of each growing shelf module 4 by the additional humidifying air flow conduit 25 as described above. Further, a humidified air flow (indicated by a one-dot chain line) can be additionally supplied to each stage of the growing shelf 3 of each growing shelf module 4 via the additional humidified air flow conduit 25.

  For example, when curing grafted seedlings, a relative humidity close to 100% is required, but humidified air close to 100% relative humidity as in the present invention, rather than making the entire atmosphere in the closed structure 1 a high humidity environment. The system that supplies the flow to each stage of the growing shelf of the growing shelf module 4 has an advantage that the humidifying device 20 having a small humidifying capacity can be used. Furthermore, since the relative humidity is lowered by contact with the culture medium, plants, etc. of the cell tray when a high humidity air flow passes through each stage of the growing shelf, the entire atmosphere in the closed structure 1 is close to 100%. As a result, it is possible to use a home air conditioner that cannot be used in a high humidity environment, and it is difficult for the temperature sensor and the humidity sensor to deteriorate in the high humidity environment.

  In a more preferred embodiment of the humidified air flow supply system of the present invention, the translucent shield 30 shown in FIG. 9 or the plant growing unit 40 shown in FIG. 4 is provided on each stage of the growth shelf of the multistage plant growing apparatus. By using it, a high-humidity environment can be generated more quickly and reliably in the translucent shield 30 or the plant growing unit 40.

  That is, Patent Document 1 described above has a box shape without a bottom plate made of a transparent acrylic resin, for example, as shown in FIG. Using the translucent shield 30 provided with the pores 31, as shown in FIG. 10, the grafted seedlings 33 planted in the cell tray 32 of the bottom watering device arranged in each stage of the growth shelf 3 of the multistage type growth apparatus. Is covered. Thereby, the inside of the translucent shield 30 can be made into a high humidity environment by the water | moisture content evaporated from the grafted seedling or the culture medium. In the humidified air flow supply system of the present invention, plants such as grafting seedlings 33 and the like planted on the cell tray 32 of the bottom irrigation device arranged at each stage of the growing shelf are covered with such a light-shielding shield 30 to grow the seedlings. In this case, it can be applied more effectively. That is, by supplying a humidified air flow from the drain port 14 to the light-transmitting shielding object 30 when the bottom watering device stops watering, a high-humidity environment is generated in the light-transmitting shielding object 30 more quickly and reliably. In addition, the air flow in the atmosphere of the closed structure 1 whose temperature and carbon dioxide concentration are adjusted by the air conditioner 7 and the carbon dioxide supply device 8 can be more efficiently supplied into the translucent shield 30. it can.

  Similar to the above-described translucent shield 30, a plant growing unit 40 as shown in FIG. 4 that can provide a high-humidity environment is disclosed in Japanese Patent Application No. 2007-110051 by the same applicant as the present application. Proposed. This plant growing unit 40 has a structure in which a bottom watering device is integrated. That is, it has a box shape composed of a quadrilateral bottom wall 41, four side walls 42a, 42b, 42c, 42d and a top wall 43. The front side wall 42a is a door 44 that can be opened and closed. A plurality of ventilation holes 45 are formed in the side walls 42c and 42d, and water supply ports 13 and drainage ports 14 are respectively provided in the vicinity of both ends of the bottom wall 41 near the door 44. At least the door 44 and the top wall 43 are translucent. Consists of materials.

  A plurality of rear slit-like openings 46 having means for changing the opening ratio from fully open to fully closed are formed in the back side wall 42 b facing the door 44. A cell tray (not shown) containing a medium for planting the plant is placed on the bottom wall 41 surface, and the nutrient solution is supplied from the water supply port 13 to water the bottom surface, and the remaining nutrient solution is discharged from the drain port 14. Is done.

As an example of means for changing the aperture ratio of the rear slit-shaped opening 46, an aperture ratio adjusting plate 47 as shown in FIG. 5 can be used. The aperture ratio adjusting plate 47 is formed with a plurality of slit-like openings 47 having substantially the same shape and dimensions as the plurality of back-side slit-like openings 46 formed on the back-side wall 42b, and is fixed to the outer surface of the back-side wall 42b. The guide frames 49, 49 are slidably held on the outer surface of the rear side wall 42b. By sliding the aperture ratio adjusting plate 47 with respect to the outer surface of the rear side wall 42b, the rear slit-shaped opening 46 and the slit-shaped opening 48 of the aperture ratio adjusting plate 47 are completely removed as shown in FIG. When the position does not overlap, the aperture ratio is 0% (fully closed), as shown in FIG. 6B, the aperture ratio is 50% (half open), and the aperture ratio is completely overlapped as shown in FIG. 6C. At the position, the aperture ratio is 100% (fully open), and the aperture ratio can be changed to an arbitrary aperture ratio from fully open to fully closed.
By using the plant growing unit 40 having such a structure, the front door 44 and the rear slit-like opening 46 provided in the rear side wall 42b are opened and closed, so that not only a shielding state that brings about a high humidity environment but also an open state. The state can also be nurtured.

  The humidified air flow supply system of the present invention can be applied more effectively even when the plant growing unit 40 of FIG. That is, when a high humidity environment is required for plant growth, the inside of the plant growth unit 40 is placed in the cell tray by closing the front door 44 of the plant growth unit 40 and the rear slit-like opening 46 provided on the rear surface thereof. Although it can be made into a high humidity environment by the water evaporated from the culture medium or the plant, the humidified air flow is supplied from the drain port 14 to the plant growing unit 40 when the bottom watering device is stopped using the humidified air flow supply system of the present invention. In addition, a high humidity environment can be generated in the plant growing unit 40 more quickly and reliably, and the temperature and carbon dioxide concentration are adjusted by the air conditioner 7 and the carbon dioxide supply device 8. The air flow of the atmosphere in the structure 1 can be supplied into the plant growing unit 40 more efficiently. The plant growing unit 40 illustrated in FIG. 4 may open the front door 44 and the rear slit-shaped opening 46 during a plant growing period that does not particularly require a high humidity environment. There exists an advantage which does not require the operation | work removed from each stage of the growth shelf 3 like the shield 30. FIG.

It is explanatory drawing which shows the basic concept of the humidification airflow supply system of this invention. It is an enlarged view of the U-shaped liquid reservoir part in FIG. It is explanatory drawing which shows the Example which applied the humidified airflow supply system of this invention to the several multistage type | formula growth shelf module. It is a perspective view which shows the example of the bottom irrigation apparatus integrated plant growth unit which can be arrange | positioned to each stage of a growth shelf. It is a perspective view which shows the Example of the means to change the aperture ratio of the back slit-shaped opening in the plant growth unit of FIG. It is explanatory drawing which shows the state which changed the aperture ratio of the back surface slit-like opening in the plant growth unit of FIG. 4 to (A) 0%, (B) 50%, (C) 100%. It is explanatory drawing which shows the example of the conventional multistage plant growing apparatus. It is explanatory drawing which shows the example of the supply / discharge system of the nutrient solution to the bottom irrigation apparatus arrange | positioned in the growth shelf each stage in the conventional multistage plant growing apparatus. It is a perspective view which shows the example of the translucent shield conventionally used in order to bring about a high humidity environment. It is explanatory drawing which shows the usage method of the translucent shield of FIG.

Explanation of symbols

1: Closed structure
2: Light shielding heat insulating wall 3: Growth shelf 4: Multistage growth shelf module 5: Artificial lighting device 6: Fan 7: Air conditioner 8: Carbon dioxide supply device 10: Nutrient solution tank 11: Nutrient solution supply pipe 13: Water supply port 14: Drain port 16: Drainage return pipe 16a: Drainage return pipe upper end 17: Drainage return horizontal pipe 17a: Drainage return horizontal pipe upstream end 20: Humidifier 22: Humidification air flow conduit 23: U-shaped liquid reservoir Part 25: Additional humidified air flow conduit
32: Cell tray P: Pump

Claims (3)

At least one multi-stage growth shelf module in which a plurality of stages of growth shelves are arranged in a vertical direction in a closed structure surrounded by a light-shielding heat insulating wall, and air conditioning that regulates the temperature of the atmosphere in the closed structure Installing a device and a carbon dioxide supply device for adjusting the carbon dioxide concentration in the atmosphere;
A bottom surface irrigation apparatus having a water supply port and a drain port that can be mounted with a plurality of cell trays containing a plant growth medium on each of the growth shelf stages of the multi-stage growth shelf module and can be intermittently irrigated from the bottom surface of the cell tray. Arranged;
An artificial lighting device for irradiating light to a cell tray placed on a lower stage of the rear side of each stage of the growing shelf;
A fan that sucks an airflow from the front of each stage and generates an airflow in each stage is provided at the back of each stage of the growing shelf;
In the multi-stage plant growing device that can supply the temperature-controlled and adjusted carbon dioxide gas concentration to each stage of the growing shelf as an air flow,
Installing a humidifying device in the closed type structure for sucking and controlling the temperature-controlled and adjusted carbon dioxide gas concentration in the closed type structure and sending it out as a humidified air flow;
A nutrient solution supply pipe for supplying a nutrient solution by a pump from a nutrient solution tank installed outside the closed structure to a water supply port of a bottom irrigation device disposed at each stage of the growth shelf in the closed structure is provided. ;
A drainage return pipe that collects drainage discharged from a drain outlet of a bottom irrigation device arranged at each stage of the growth shelf and guides it to the lower side of the lowest stage growth shelf of the growth shelf module and is connected to the lower end of the drainage return pipe. A drainage return horizontal pipe for returning the drainage liquid to the nutrient solution tank;
Forming a U-shaped liquid reservoir in the drainage return horizontal pipe in the vicinity of the nutrient solution tank;
A growing shelf for a multi-stage plant growing device, wherein a humidified air flow conduit for guiding a humidified air flow delivered from the humidifying device is connected to an upstream end of a drainage return horizontal pipe upstream of the U-shaped liquid reservoir. Humidified air flow supply system to each stage.   The humidified air to each stage of the growing shelf of the multi-stage plant growing apparatus according to claim 1, wherein the upper end of the upstream side of the U-shaped liquid reservoir is positioned higher than the upper end of the downstream side. Flow supply system.   In addition to the humidified air flow conduit for guiding the humidified air flow delivered from the humidifier, an additional humidified air flow conduit is separately provided and connected to the upper end of the drainage return pipe of the uppermost growth shelf of the growth shelf module. The humidified airflow supply system to each stage of the growing shelf of the multistage plant growing apparatus according to claim 1 or 2, characterized by the above.

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