Multi-stage cultivation device

Abstract

To make air evenly circulate around plants.SOLUTION: A multistage cultivation device 100 comprises: a cultivation shelf 1 having shelf spaces 2 which are formed in a multistage in a vertical direction; artificial illumination 11 which are arranged on a ceiling part of the shelf space; fan 13 which is arranged on the ceiling part of the shelf space, has an upward suction port and a downward outlet, and the suction port is positioned apart from a ceiling C of the shelf space; and a baffle plate 14 which is arranged opposing the outlet while being apart and below the outlet.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a multi-stage cultivation device.

Background Art

[0002] In a plant factory, generally, plants such as fruit vegetables and leaf vegetables are hydroponically cultivated in an indoor space using artificial light sources and a culture solution.

[0003] At this time, cultivation shelves are provided in the indoor space. Artificial lighting is installed on the ceiling of each shelf space of the cultivation shelf. In addition, in order to ventilate the air in each shelf space individually, a small fan is installed for each shelf space.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in recent years, the cultivation shelves have become larger, and the plants have also become larger for industrial processing, and the height of each shelf space tends to be at the limit of the required level. Therefore, when the plants grow, the shelf space is occupied by the plants, and it may be difficult to evenly distribute air around each plant.

[0006] Therefore, in view of such circumstances, the present disclosure was devised, and its object is to provide a multi-stage cultivation device capable of evenly distributing air around each plant.

Means for Solving the Problems

[0007] According to one aspect of the present disclosure, a cultivation shelf having shelf spaces formed in multiple stages in the vertical direction, artificial lighting disposed on the ceiling of the shelf space, A fan is positioned in the ceiling of the shelf space, having an upward-facing air intake and a downward-facing air outlet, with the air intake positioned at a distance from the ceiling of the shelf space. A baffle plate is positioned opposite the aforementioned air outlet and spaced apart below it, A multi-stage cultivation apparatus is provided, characterized by having the following features.

[0008] Preferably, the baffle plate is transparent or translucent.

[0009] Preferably, in a bottom view, the area of ​​the baffle plate is 1 to 2 times the area of ​​the air outlet.

[0010] Preferably, the baffle plate has a plurality of small holes.

[0011] Preferably, the baffle plate has a notch at its peripheral edge.

[0012] Preferably, the artificial lighting is arranged in multiple locations on the ceiling of the shelf space. The fan and the baffle plate are positioned between two adjacent artificial lights. [Effects of the Invention]

[0013] According to this disclosure, air can be evenly distributed around each plant. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic and transparent perspective view showing a part of the multi-stage cultivation apparatus of this embodiment. [Figure 2] This is a schematic front cross-sectional view showing a part of a multi-tiered cultivation system. [Figure 3] This is a bottom view of the fan unit, seen from below. [Figure 4] This is a front view of the fan unit as seen from the front. [Figure 5] It is a plan view when the fan unit is viewed from above. [Figure 6] It is a bottom view when the fan is viewed from below. [Figure 7] It is a front sectional view when the fan is viewed from the front. [Figure 8] It is a sectional view taken along line VIII-VIII of FIG. 3, showing the state when the fan unit is attached to the ceiling. [Figure 9] It is a schematic front sectional view showing the air flow in the shelf space. [Figure 10] It is a schematic front view showing the relationship of the height positions of the LED, the fan, and the baffle plate. [Figure 11] It is a schematic front view showing the relationship of the height positions of the LED, the fan, and the baffle plate in another example. [Figure 12] It is a schematic front view showing the relationship of the height positions of the LED, the fan, and the baffle plate in yet another example. [Figure 13] It is a bottom view showing a first modification example of the baffle plate. [Figure 14] It is a bottom view showing a second modification example of the baffle plate. [Figure 15] It is a front sectional view showing a third modification example of the baffle plate. [Figure 16] It is a bottom view showing a fourth modification example of the baffle plate. [Figure 17] It is a bottom view showing a fifth modification example of the baffle plate.

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to the following embodiments.

[0016] FIG. 1 is a perspective view schematically and transparently showing a part of the multi-stage cultivation device of the present embodiment. FIG. 2 is a front sectional view schematically showing a part of the multi-stage cultivation device. For convenience, the directions of front, rear, left, right, up, and down are defined as shown in the drawings.

[0017] As shown in Figures 1 and 2, the multi-tiered hydroponic cultivation system 100 has a cultivation shelf 1 installed in the cultivation room R of a plant factory, and the cultivation shelf 1 has shelf spaces 2 formed in multiple tiers in the vertical direction. In Figure 1, only one shelf space 2 is mainly shown, and in Figure 2, three shelf spaces 2 are shown. The configuration of each shelf space 2 is the same. The number of tiers in the shelf spaces 2 on the cultivation shelf 1 is arbitrary, for example, four tiers.

[0018] The cultivation shelf 1 is formed in a rectangular parallelepiped shape as a whole, with its length in the front-to-back direction being longer than its width in the left-to-right direction, and having a predetermined height. The front-to-back direction of the cultivation shelf 1 is called the longitudinal direction, and the left-to-right direction of the cultivation shelf 1 is called the short direction.

[0019] The cultivation shelf 1 has a shelf frame 6 constructed by assembling multiple support columns 3 extending vertically, multiple longitudinal beams 4 extending in the front-to-back direction, and multiple transverse beams 5 (omitted in Figure 2) extending horizontally, in a rectangular grid pattern. The cultivation shelf 1 has multiple shelf boards 7 supported by at least one of the longitudinal beams 4 and transverse beams 5. The shelf boards 7 divide the interior of the cultivation shelf 1 vertically. The space between adjacent upper and lower shelf boards 7 becomes the shelf space 2. The shelf boards 7 form the floor F of the shelf space 2 above them and the ceiling C of the shelf space 2 below them. In any shelf space 2, the area near the ceiling C is called the ceiling section, and the area near the floor F is called the floor section.

[0020] Furthermore, the lowest shelf board 7 forms the bottom plate of the cultivation shelf 1, and there is no shelf space 2 below it. Similarly, the highest shelf board 7 forms the top plate of the cultivation shelf 1, and there is no shelf space 2 above it.

[0021] A hydroponic bed 8 containing nutrient solution is placed on a shelf board 7 that forms the floor F of each shelf space 2. A planting panel 10 is installed in the upper opening of the hydroponic bed 8, and the planting panel 10 has numerous cultivation holes 9 formed at equal intervals for planting plants P. In this embodiment, the plants P are fruit vegetables or leafy vegetables, for example, lettuce. The hydroponic bed 8 and planting panel 10 are sized to cover approximately the entire length and width (i.e., approximately the entire area) of the shelf space 2, and therefore the plants P are planted over approximately the entire length and width of the shelf space 2.

[0022] Artificial lighting is installed on the ceiling of each shelf space 2. The artificial lighting in this embodiment is a straight-tube LED 11 having a predetermined length (for example, 1200 mm). In this embodiment, multiple LEDs 11 (specifically, 5) are provided in a series arrangement along the front-to-back direction. In addition, multiple rows (specifically, 4 rows) of these single rows of LEDs 11 are provided at equal intervals in the left-to-right direction. These LEDs 11 are suspended from the ceiling C using brackets or the like. Therefore, the LEDs 11 are spaced downward from the ceiling C, and a gap 12 is formed between the LEDs 11 and the ceiling C.

[0023] Furthermore, a fan 13 and a baffle plate 14 are positioned on the ceiling of each shelf space 2. The fan 13 blows air downwards, and the baffle plate 14 collides with the blown airflow, diffusing the airflow horizontally. In this embodiment, the fan 13 and baffle plate 14 are combined to form a fan unit 15.

[0024] Figures 3 to 5 show the bottom view, front view, and top view of the fan unit 15 when viewed from below, the front, and above, respectively. Figures 6 and 7 show the bottom view and front cross-sectional view of the fan 13 when viewed from below and the front, respectively.

[0025] As shown in Figures 6 and 7, the fan 13 comprises a casing 16, a motor 17, and an impeller 18. The fan 13 has a central axis C1 that extends in the vertical direction.

[0026] The casing 16 is made of cast aluminum and has a cylindrical portion 19 arranged coaxially with the central axis C1, and rectangular (specifically square) flange portions 20A and 20B (see Figure 4) integrally provided at the upper and lower ends of the cylindrical portion 19. Inside the cylindrical portion 20, a fan internal passage 23 with a circular and linear cross-section is formed. The upper open end of the fan internal passage 23 serves as an air intake port 21 for introducing air, and the lower open end of the fan internal passage 23 serves as an air outlet port 22 for blowing air out. Thus, the fan 13 has an upward-facing air intake port 21 and a downward-facing air outlet port 22.

[0027] The motor 17 and impeller 18 are arranged within the fan's internal passage 23. The motor 17 is a relatively thin disc-shaped motor with a smaller diameter than the outlet 22 and is arranged coaxially with the central axis C1. The motor 17 is positioned inside the outlet 22 so as to be almost flush with the lower end flange portion 20B. The motor 17 is connected to the cylindrical portion 20 by multiple (four) spokes 24 that extend radially within the outlet 22.

[0028] The impeller 18 is also arranged coaxially with the central axis C1. The impeller 18 has a disc-shaped hub 25 located in its center and multiple (5) blades 26 provided at equal intervals on the outer circumference of the hub 25. The hub 25 is positioned above and adjacent to the motor 17 and has the same outer diameter as the motor 17. The output shaft of the motor 17 is fixed to the hub 25 on the central axis C1, and the impeller 18 is rotated by the rotation of the output shaft. The impeller 18 is positioned within the fan's internal passage 23 so as to be substantially flush with the upper end flange portion 20A.

[0029] As shown in Figure 6, mounting holes 27 are provided at the four corners of the lower flange portion 20B. Also, as shown in Figure 5, mounting holes 28 are provided at the four corners of the upper flange portion 20A.

[0030] As shown in Figures 3 to 5, the baffle plate 14 is made of a transparent, rectangular (specifically square) plate made of resin. The baffle plate 14 is positioned opposite the air outlet 22, below it, and spaced apart from it.

[0031] The baffle plate 14 has a central axis C2 that extends in the vertical direction, and this central axis C2 is located coaxially with the central axis C1 of the motor 17. As shown in Figure 3, the baffle plate 14 has a larger area than the air outlet 22 when viewed from below, and in this embodiment, it has a larger area than the motor 17.

[0032] As shown in detail in Figure 8, the baffle plate 14 is provided with mounting holes 29 at positions corresponding to the mounting holes 27 of the lower end flange portion 20B. A cylindrical spacer 30 is positioned coaxially with the mounting holes 27 and 29 between the baffle plate 14 and the lower end flange portion 20B. A screw 31 is inserted from below in the order of mounting hole 29, spacer 30, and mounting hole 27. A nut 32 is tightened onto the portion of the screw 31 that protrudes above the mounting hole 27. This integrates the baffle plate 14 and the fan 13, forming the fan unit 15.

[0033] This fan unit 15 is mounted spaced apart on the shelf board 7 that forms the ceiling C of the shelf space 2. As a result, the air intake 21 is positioned spaced apart from the ceiling C.

[0034] The shelf board 7 forming the ceiling C has mounting holes 33 at positions corresponding to the mounting holes 28 of the upper flange portion 20A. A cylindrical spacer 34 is positioned coaxially with the mounting holes 28 and 33 between the shelf board 7 and the upper flange portion 20A. A screw 35 is inserted from above in the order of mounting hole 33, spacer 34, and mounting hole 28. A nut 36 is tightened onto the portion of the screw 35 that protrudes downward from the mounting hole 28. This attaches the fan unit 15 to the ceiling C.

[0035] As shown in Figures 1 and 2, the fan 13 and baffle plate 14, i.e., the fan unit 15, are positioned between two adjacent LEDs 11. In this embodiment, as shown in Figures 1 and 2, the fan unit 15 is positioned between the second and third rows from the left of the four rows of LEDs 11, i.e., between the two middle rows. This position is exactly in the middle of the left-right width of the cultivation shelf 1 or shelf space 2.

[0036] Furthermore, multiple fan units 15 are provided at equal intervals in the longitudinal direction. In this embodiment, five fan units 15 are provided corresponding to each of the five LEDs 11 that make up a row of LEDs 11, and each fan unit 15 is positioned exactly in the middle of the length of each LED 11.

[0037] Next, the effects and advantages of this embodiment will be described.

[0038] Figure 9 is a schematic front cross-sectional view showing the airflow in this embodiment. The figure shows the airflow in one shelf space 2 indicated by a dashed arrow A. This airflow is the same in each shelf space 2.

[0039] When fan 13 is activated, an airflow is created that passes through fan 13 from top to bottom. Air is drawn into the fan 13 through the upward-facing intake port 21 located at the top of fan 13 and blown out of fan 13 through the downward-facing outlet port 22 located at the bottom of fan 13.

[0040] As air above fan 13 is drawn into fan 13 through the air intake 21, an airflow a is created above fan 13 that flows horizontally along the ceiling C of shelf space 2 towards the air intake 21. This airflow a continuously draws fresh air from outside shelf space 2 into shelf space 2 within the cultivation room R. The air inside cultivation room R is controlled by an air conditioner (not shown) to maintain a temperature, humidity, carbon dioxide concentration, etc., suitable for cultivation. Therefore, fan 13 continuously draws in and blows out this fresh air suitable for cultivation.

[0041] Since airflow a flows through the gap 12 between the LED 11 and the ceiling C, it is possible to prevent airflow a from being obstructed by the LED 11.

[0042] The air blown out from the outlet 22 collides with the baffle plate 14 located directly below it, is bent 90°, and flows along the upper surface of the baffle plate 14 towards the outside of the baffle plate 14. Immediately after passing the baffle plate 14, the flow is briefly bent diagonally downwards. Subsequently, it flows horizontally in the space below the LED 11 and above the plant P (the space between the LED 11 and the plant P) in the opposite direction to the previous airflow a, as indicated by the symbol b, and finally reaches the space inside the cultivation room R outside the shelf space 2.

[0043] Attracted by this airflow b, the air in the gaps between the plants P flows upward as indicated by the symbol c, and merges with airflow b. This ensures good ventilation of the air in the gaps between the plants P.

[0044] The operation of the fan 13, located in the center of the width of the shelf space 2, creates two airflows symmetrically on either side of the fan 13: airflow a moving from the outside inward towards the fan 13, and airflow b moving from the inside outward away from the fan 13. These airflows a and b are formed for each of the multiple fans 13 arranged in the front-to-back direction. As a result, the entire shelf space 2 can be well ventilated.

[0045] Thus, according to this embodiment, air can be evenly distributed around each plant P. In particular, in the upper space of the ceiling, air can flow horizontally from the outside to the inside of the shelf space 2. Also, in the lower space of the ceiling, air can flow horizontally in the opposite direction, from the inside to the outside of the shelf space 2. Therefore, two opposing airflow layers can be formed in the ceiling, and even when the shelf space 2 is filled with plants P, air can be evenly distributed around each plant P. This reduces variations in the airflow environment within the shelf space 2.

[0046] Furthermore, because air is evenly distributed around each plant P, the airflow reaches the growing point of the plant P, which helps prevent tip burn.

[0047] Even if there is a gap between plants P directly below the baffle plate 14, the air in that gap is drawn into the airflow b, as indicated by the symbol d, so that the air in that gap can be well ventilated.

[0048] Furthermore, since the air blown out from the outlet 22 of the fan 13 collides with the baffle plate 14, it is possible to avoid the air directly colliding with the plant P. Therefore, it is possible to prevent adverse effects such as poor growth caused by direct collision and protect the plant P.

[0049] If the baffle plate 14 is absent, the air blown out from the fan 13 will directly collide with the plant P. Therefore, in order to distribute air throughout the entire shelf space 2 while suppressing the harmful effects of the collision, it would be necessary to install many fans with low airflow.

[0050] However, in this embodiment, because of the baffle plate 14, the air blown out from the fan 13 does not directly collide with the plant P. Therefore, fewer fans with high airflow can be installed, resulting in energy savings and cost reductions.

[0051] On the other hand, in this embodiment, the fan 13 and baffle plate 14 are positioned between two adjacent LEDs 11. Therefore, the dead space between the LEDs 11 can be effectively utilized.

[0052] To obtain the above effects, in a bottom view as shown in Figure 3, the area of ​​the baffle plate 14 is preferably 1 to 2 times the area of ​​the fan outlet 22, and more preferably 1.2 to 1.5 times. Here, the area of ​​the fan outlet 22 refers to the cross-sectional area of ​​the lower end of the fan's internal passage 23, ignoring the motor 17 and spokes 24.

[0053] Furthermore, as shown in Figure 4, the distance D between the baffle plate 14 and the air outlet 22 of the fan 13 is preferably 10 mm or more and 100 mm or less.

[0054] Furthermore, as shown in Figure 10, in this embodiment, the height position Hf of the lower end of the fan 13 is higher than the height position Hl of the lower end of the LED 11. Therefore, it is possible to prevent the light from the LED 11 from being blocked by the fan 13 as much as possible, and the light can be irradiated over a wide area. In the figure, line Lf indicates the upper limit of the irradiation range in which the light from the LED 11 is not blocked by the fan 13.

[0055] Furthermore, in this embodiment, the baffle plate 14 is transparent. Therefore, it is possible to substantially prevent the light from the LED 11 from being blocked by the baffle plate 14, and to ensure the same illumination range as when there is no baffle plate 14. The upper limit of the illumination range is the same position Lf as when there is no baffle plate 14.

[0056] The baffle plate 14 may be semi-transparent or opaque. If it is semi-transparent, light will be attenuated but will still pass through the baffle plate 14, so although the amount of light will decrease, the same illumination range as when it is transparent can be maintained.

[0057] If the material is opaque, light cannot pass through, so the upper limit of the illumination range becomes Lb, and the illumination range is reduced. In the case of opaque material, the illumination range changes depending on the height position Hb of the lower end of the baffle plate 14. Figure 10 shows the case where the height position Hb of the lower end of the baffle plate 14 is lower than the height position Hl of the lower end of the LED 11. Figure 11 shows the case where the height position Hb of the lower end of the baffle plate 14 is equal to the height position Hl of the lower end of the LED 11. Figure 12 shows the case where the height position Hb of the lower end of the baffle plate 14 is higher than the height position Hl of the lower end of the LED 11. As can be seen from these figures, the illumination range of the LED 11 widens as the height position Hb of the lower end of the baffle plate 14 increases. And the upper limit of the illumination range Lb increases as the height position Hb of the lower end of the baffle plate 14 increases.

[0058] Therefore, in order to ensure a desirable wide illumination range, it is preferable that the height position Hb of the lower end of the baffle plate 14 is equal to the height position Hl of the lower end of the LED 11 (in the case of Figure 11) or higher than that height position Hl (in the case of Figure 12).

[0059] However, the height position Hb of the lower end of the baffle plate 14 can be set arbitrarily, taking into consideration the layout and airflow within the shelf space 2. If the height position Hb is set lower than the height position Hl of the lower end of the LED 11 (as in Figure 10), the airflow from the baffle plate 14 will more easily pass under the LED 11, reducing interference with the LED 11.

[0060] In this embodiment, since the baffle plate 14 is transparent, the illumination range is not limited even if the height position Hb of its lower end is lower than the height position Hl of the lower end of the LED 11. Furthermore, by making the height position Hb of the lower end of the baffle plate 14 lower than the height position Hl of the lower end of the LED 11, interference between the airflow exiting the baffle plate 14 and the LED 11 can be reduced. Therefore, it is possible to obtain both a desirable illumination range and airflow simultaneously.

[0061] The shape of the baffle plate 14 does not have to be square. For example, it may be rectangular, as shown in the first modified example in Figure 13. In the example in Figure 13, the width of the baffle plate 14 is longer than the length from front to back, but the opposite may also be true, with the length from front to back being longer than the width from front to back.

[0062] The baffle plate 14 may be circular, as shown in the second modified example in Figure 14. Alternatively, although not shown, it may be elliptical or oblong.

[0063] As shown in the third modified example in Figure 15, the baffle plate 14 may have a plurality of small holes 40. In this case, the baffle plate 14 can be formed from, for example, a metal or resin perforated plate or mesh plate. This allows some of the air blown out from the outlet 22 to leak out through the small holes 40 and be sent directly below the baffle plate 14, thereby supplying more air to the plant P directly below the baffle plate 14.

[0064] However, the primary function of the baffle plate 14 is to change the direction of the air blown out from the outlet 22 from downward to horizontal. Therefore, the number, size, and arrangement of the small holes 40 should be set so as not to hinder this basic function.

[0065] Therefore, in this modified example, at least one of the number, size, and arrangement of the small holes 40 is set such that, for example, 20% or less of the air blown out from the outlet 22 flows through the small holes 40, while the remainder flows horizontally without passing through the small holes 40.

[0066] As shown in the fourth and fifth modified examples in Figures 16 and 17, the baffle plate 14 may have notches 41 and 42 on its peripheral edges. In the example shown in Figure 16, square notches 41 are provided at the four corners (front, back, left, and right) of the square baffle plate 14. In the example shown in Figure 17, rectangular notches 42 are provided on each side (front, back, left, and right) of the square baffle plate 14. The notches 42 are formed in a rectangular shape extending along each side, in the central part of each side excluding both ends.

[0067] Air that strikes the baffle plate 14 is bent at a right angle, then flows radially along the upper surface of the baffle plate 14 around the central axis C1, and then passes through the baffle plate 14 and is bent diagonally downward and diffused. In this case, if there are notches 41 and 42, the air can escape from the baffle plate 14 earlier and be directed diagonally downward than if there were notches. Therefore, considering the range of angles around the central axis C1, within the angle ranges θ1 and θ2 where there are notches 41 and 42, the downward directivity of the airflow can be strengthened compared to when there are notches 41 and 42.

[0068] Therefore, for example, if there is a location near the bottom of the baffle plate 14 where it is desirable to supply airflow more actively, such supply can be achieved by providing notches 41 and 42 corresponding to this location.

[0069] Alternatively, if it is desired to strengthen the downward airflow in a specific direction, taking into account the overall flow within shelf space 2, this can be achieved by providing notches 41 and 42 in accordance with that specific direction.

[0070] Although embodiments of this disclosure have been described in detail above, various other embodiments and modifications of this disclosure are conceivable.

[0071] (1) For example, the baffle plate 14 may be made of a material other than resin, such as metal.

[0072] (2) Multiple fans 13 and baffle plates 14, i.e., fan units 15, may be provided in the left-right width direction (short side direction).

[0073] (3) The straight-tube LED 11 may be arranged to extend in the left-right width direction (short side direction) of the shelf space 2.

[0074] (4) Artificial lighting may be formed by something other than the straight-tube LED 11. For example, it may be formed by a bulb-type LED or a regular light bulb that is not an LED.

[0075] The embodiments of this disclosure are not limited to those described above, but include any variations, applications, and equivalents encompassed within the spirit of this disclosure as defined by the claims. Therefore, this disclosure should not be constrained, but can be applied to any other art that falls within the scope of the spirit of this disclosure. [Explanation of symbols]

[0076] 1 cultivation rack 2 shelf space 11 LED 13 Fans 14 Baffle Plate 21 Air intake 22 Air outlet 40 small hole 41, 42 Notches 100 Multi-stage cultivation equipment C Ceiling

Claims

1. A cultivation shelf having multiple levels of shelf space formed in the vertical direction, Artificial lighting is installed on the ceiling of the aforementioned shelf space, A fan is positioned in the ceiling of the shelf space, having an upward-facing air intake and a downward-facing air outlet, with the air intake positioned at a distance from the ceiling of the shelf space. A baffle plate is positioned opposite the aforementioned air outlet and spaced apart below it, Equipped with, The baffle plate is positioned horizontally and is formed from a transparent or translucent flat plate. The baffle plate has a notch formed by cutting out a part of its peripheral edge. A multi-stage cultivation device characterized by the following features.

2. In a view from below, the area of ​​the baffle plate is between 1 and 2 times the area of ​​the air outlet. The multi-stage cultivation apparatus according to claim 1.

3. The baffle plate has a plurality of small holes The multi-stage cultivation apparatus according to claim 1.

4. The baffle plate is rectangular in shape, The notch is provided at the corner of the baffle plate. The multi-stage cultivation apparatus according to claim 1.

5. The baffle plate is rectangular in shape, The notch is provided on the edge of the baffle plate. The multi-stage cultivation apparatus according to claim 1.

6. Multiple artificial lights are arranged on the ceiling of the shelf space. The fan and the baffle plate are positioned between two adjacent artificial lights. The multi-stage cultivation apparatus according to claim 1.

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