JP4761729B2 - Plant growing device - Google Patents

Description

  The present invention relates to a plant growing apparatus using LEDs and a dehumidifying mechanism suitably used for the apparatus.

  2. Description of the Related Art Conventionally, plant growing apparatuses that perform plant growing using an artificial light source such as a fluorescent lamp or a sodium lamp are known. However, since fluorescent lamps and sodium lamps contain a lot of light with a wavelength necessary for plant growth, they must irradiate plants with a large amount of light, and are not very efficient. In addition, there is a problem that a lot of equipment costs and running costs are required in addition to the large amount of heat generated and the difficulty of temperature control in the plant growing room. Furthermore, it is difficult to say that the service life is sufficient.

  On the other hand, as shown in Patent Document 1, a plant growing apparatus using an LED as a light source has recently been developed as a solution to all these problems related to light. This Patent Document 1 describes a device using a compact and quiet Peltier module (thermoelectric conversion element) as a dehumidifying mechanism.

As is well known, the Peltier module has a Peltier element in which P-type and N-type thermoelectric semiconductors are soldered to a copper electrode, and has a pair of heat absorbing and generating surfaces. And when used for dehumidification, the amount of current applied to the Peltier element and its direction are controlled so as to cool the heat absorbing and generating surface in the plant growing room, and this cooled heat absorbing and generating surface or thermally connected to this heat absorbing and generating surface. The air in the plant growing room is dewed and dehumidified with the member.
JP 2003-79254 A

However, the dehumidifying mechanism described in Patent Document 1 is a member that is thermally connected to the heat-absorbing and heat-generating surface for condensation, and forms a single long and winding air flow path. In order to obtain, air must flow through the air flow path at a fairly fast flow rate. As a result, there is a problem that the condensation is not sufficiently performed and the maximum dehumidifying ability of the Peltier module cannot be utilized.

Such a problem is not limited to the plant growing device, but is considered to be common to the dehumidifying mechanism using the Peltier module.

  Therefore, the present invention is intended to solve this kind of problem peculiar to the Peltier module and to greatly increase the dehumidification efficiency.

In other words, the plant growing apparatus according to the present invention includes a casing that forms a space in which a plant can be accommodated, an LED illumination device that irradiates light in the space, and a dehumidifying mechanism that dehumidifies the space. A growing apparatus, wherein an inner space of the casing is partitioned by a partition wall into at least a control air generation space in which air is dehumidified and a plant growth space in which plants are grown, and the dehumidifying mechanism is a casing of wall mounted by penetrating the Peltier module to which the absorption and generation heat surface is provided so as to face the control air generating space, be of a hollow having an air inlet and an air outlet port of the Peltier module a cover body attached to the endothermic and exothermic heat surface of the casing inner space side, a fan attached to the air inlet or air outlet of the cover body, the cover Forms Subdivision an inner space of the body, comprising a ward-defining wall extending in the vertical direction is on the end faces under end said air inlet to form a plurality of parallel air flow paths facing the air outlet port, the air The flow rate of the air flow path is controlled by the opening area or the opening shape of the introduction port or the air outlet port, and the control air generation space and the plant growth space on the control air generation space side of the partition wall The air that has passed through the dehumidifying mechanism and has risen in the control air generation space is lowered along the communication path, and then rises again to return to the plant growing space. It is characterized by being.

  If this is the case, air to be dehumidified can flow at a sufficiently slow speed for condensation in each air circulation path, and since there are multiple air circulation paths, sufficient dehumidifying ability can be exhibited. it can.

  In addition, if the air flow is created on the heat absorption / heating surface with only the fan, sufficient air cannot be brought into contact with the heat absorption / heating surface, and the air flow becomes non-uniform so that the dehumidification efficiency is maximized. Where it cannot be increased, a plurality of air flow paths are formed by the partition walls inside the cover body, and the flow rate of these air flow paths is controlled and uniformed by the opening area or opening shape of the air inlet or outlet port. Therefore, the maximum dehumidifying ability of the Peltier module can be exhibited.

  The fan may be provided on either the air inlet side or the air outlet side, but more preferably, the flow rate of the air flow path is adjusted to the air inlet (or air outlet) located on the opposite side of the fan. It is desirable to ensure a sufficiently wide opening area for the air outlet (or air inlet) on the fan side.

  In particular, in order to effectively perform dew condensation, it is desirable that the partition wall is a heat conductive fin that is attached to and thermally connected to the heat absorbing / generating surface. In this case, it is more preferable that the heat conducting fins are attached over substantially the entire surface of the Peltier module.

  In order to be able to respond flexibly to Peltier modules with different heat conduction fins or different types of Peltier modules, the flow area of the air flowing through the air flow path is made variable by changing the opening area of the air inlet or air outlet. What is comprised so that adjustment is possible is preferable.

  As a preferable discharge mode of condensed moisture, the dehumidifying surface is arranged vertically, the partition wall is provided to extend in the vertical direction, and the air flow path is set to extend in the vertical direction, The water | moisture content condensed by the dehumidification effect | action is introduce | transduced into the receiving part provided in the lower end part of the cover, and what is comprised so that it can discharge | emit to external space from the receiving part with a drain tube can be mentioned.

  If dew condensation occurs on the surface of the cover body, the dehumidifying effect becomes worse. In order to prevent this, it is desirable to form the cover body by attaching a heat insulating material to the heat insulating material itself or a plate material.

  Such a dehumidifying mechanism also has a characteristic that it can be settled relatively slowly without suddenly changing the humidity. Therefore, it can be said that the humidity change is very easy for plants, and is applied to a plant growing apparatus including a casing that forms a space in which a plant can be accommodated and an LED lighting device that irradiates light in the space. And the effect becomes remarkable.

  In such a plant growing device, it is better to further provide a temperature control system for adjusting the temperature of the internal space of the casing.

  In the case where the temperature control system includes a temperature adjusting Peltier module that is attached through the wall of the casing, for example, the temperature adjusting Peltier module has the same wall as the Peltier module of the dehumidifying mechanism. What is necessary is just to comprise so that the flow of the air discharged | emitted from the fan of the said dehumidification mechanism may reach | attain the heat absorption / heat generation surface of the casing internal space side in the temperature adjusting Peltier module. As a result, the problem of condensation during cooling of the temperature adjusting Peltier module can be avoided by touching the low-humidity air discharged from the fan of the dehumidifying mechanism. On the other hand, the temperature of the low-temperature air exhausted from the fan of the dehumidifying mechanism can be adjusted more quickly by the temperature control system, and the fluctuation of the temperature inside the casing can be reduced as much as possible.

  According to the present invention configured as described above, air to be dehumidified can be made to flow uniformly at a sufficiently low speed for condensation in each air circulation path, and since there are a plurality of air circulation paths, sufficient dehumidification capability is achieved. Can be demonstrated.

  An embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the plant growing device 1 according to the present embodiment includes a casing 2 for housing a plant therein and growing it, and an LED lighting device 3 placed on the casing 2. The environment relating to the temperature, humidity, and light of the casing internal space S, which is the environment control target space, can be controlled.

  As shown in FIGS. 1 to 3, the casing 2 has a hollow rectangular parallelepiped shape including a bottom wall 21, front and rear walls 22, 23, left and right side walls 24, 25 and a top wall 26, each of which is a wall. 21-26 are comprised with the raw material which has heat insulation. The inner surfaces of the walls 21 to 26 are substantially white reflective surfaces (more specifically, a white reflective sheet is attached). The front wall 22 has a door structure that can be opened and closed. In the present embodiment, an opening portion in which two transparent plates are further fitted is provided in a part of the front wall 22 to form a viewing window 22a. A shutter 22b that can be opened and closed is attached. The top wall 26 is provided with a rectangular opening over most of the top wall 26, and a double transparent plate is fitted into the opening to form an illumination window 26a.

  As shown in FIG. 1, the LED lighting device 3 includes a rectangular wiring board 31 and a large number of LEDs 32 spread on the wiring board 31, and is detachably stacked on the casing 2. It is accommodated in the subcasing 4 to be used. The sub casing 4 has a thin rectangular parallelepiped shape substantially the same shape as the casing 2 in plan view, and a light irradiation window (not shown) is provided on the bottom plate at a position overlapping the illumination window 26a. Above the light irradiation window, a large number of LEDs 32 spread on the wiring board 31 are arranged so as to face downward, and the light emitted from the LEDs 32 passes through the light irradiation window and the illumination window 26a and the casing. 2 is irradiated. These LEDs 32 are composed of a plurality of types having different colors, and the illuminance and color of the light can be changed by changing the light emission ratio and the light emission amount of the various LEDs 32, and the light in the casing internal space S that is the environment control target space. The environment can be adjusted.

  The plant growing device 1 further includes a temperature control system that adjusts the temperature of the casing internal space S and a humidity adjustment system that adjusts the humidity.

  As shown in FIG. 3 and the like, the temperature control system includes a plurality of (for example, four) temperature-adjusting Peltier modules 51 having Peltier elements (thermoelectric conversion elements) 51a, and heat absorption and heat generation that are front and back surfaces of the respective Peltier modules 51. A pair of heat conduction fins 52 attached to the surfaces 51b and 51c directly or via a heat conduction member, a control mechanism 7 (described later) for controlling the Peltier module 51, and a temperature sensor (not shown), Depending on the amount of current applied to the Peltier module 51 and its direction, heat is dissipated or absorbed from the heat conducting fins 52 via the heat absorbing and generating surfaces 51b and 51c so that the temperature of the casing internal space S can be adjusted. In this embodiment, the Peltier modules 51 are arranged through the upper side of the casing rear wall 23, and a pair of heat conduction fins 52 respectively attached to the Peltier modules 51 are positioned inside and outside the casing 2. It is configured. The heat conductive fins 52 include a flat substrate 52a and a plurality of thin fin elements 52b that stand upright from the substrate 52a, and the back surface of the substrate 52a is disposed on the heat-absorbing and heating surfaces 51b and 51c. It is closely attached to. The fan F is directly attached to the rear surface, ie, the front end side of the fin element 52b, to the heat conducting fins 52 arranged on the outside. The heat conducting fins 52 arranged on the inner side are set so that the fin elements 52b extend in the vertical direction.

  The humidity control system includes a humidifying mechanism 6A, a dehumidifying mechanism 6B, a control mechanism 7 (described later) for controlling these, and a humidity sensor (not shown).

  As shown in FIG. 3 and the like, the humidifying mechanism 6A includes a water tank 61 attached to the outer surface of the casing side wall 24, and a water mist generating unit 63 communicating with the water tank 61 via a tube 62. The water mist generating part 63 is attached to, for example, the lower part of the outer surface of the rear wall 23, and discharges water mist generated using ultrasonic vibration, boiling, etc. from the mist discharge port 66 to the internal space S of the casing 2. To do.

  As shown in FIG. 3 and the like, the dehumidifying mechanism 6B includes a dehumidifying Peltier module 64 provided so as to penetrate the lower portion of the rear wall of the casing 2, and heat conductive fins 65 attached to the heat absorption / heat generation surface 64b outside the Peltier module 64. And a dew condensation portion 8 attached to the inner heat generating / heating surface 64c.

  As shown in an enlarged view in FIG. 4, the Peltier module 64 is formed by connecting, for example, Peltier elements 64a in a plurality of stages (two stages) in series in order to increase the performance.

  As shown in FIG. 4, the heat conducting fins 65 are the same as those used in the temperature adjusting Peltier module 51, and a fan F is attached to the rear surface thereof.

  As shown in FIGS. 4 to 6, the dew condensation portion 8 includes a cover body 81 that covers the heat absorption / heat generation surface 64 c on the casing internal space S (dehumidification target space) side of the Peltier module 64, and the cover body 81. And a partition wall 831 that defines an internal space and forms a plurality of air flow paths P.

  The cover body 81 has a hollow rectangular parallelepiped shape with an open rear surface, and is formed by attaching a heat insulating material to the heat insulating material or a plate material in order to prevent condensation on the surface. The rear surface opening is closed by a metal plate 66 that is in close contact with and thermally connected to the heat absorbing and generating surface 64c. In addition, you may comprise so that a rear-surface opening part may be obstruct | occluded directly by the heat absorption / heating surface 64c. The cover body 81 has a horizontally long air inlet 81a at the lower part of the front surface of the cover 81, and a horizontally long air outlet 81b at the upper surface. In this embodiment, the air inlet 81a is formed by dividing the front plate of the cover 81 into two parts, an upper front plate 811 and a lower front plate 812, and attaching them with a gap in the vertical direction. . The lower front plate 812 is structured to be screwed into a long hole so that the mounting position of the lower front plate 812 can be moved up and down, and the area of the air inlet 81a (especially the vertical width) is adjusted. I can do it. Further, the bottom plate 814 of the cover body 81 serves as a receiving portion for receiving water that is condensed and falls. A drain port 84 is provided, and a drain tube 82 is connected to the drain port 84 to penetrate the casing rear wall 23. By doing so, the water droplets which are condensed and fall down can be discharged from the drain port 84 and the drain tube 82 to the outside.

The partition wall 831 is formed by heat conductive fins 83. More specifically, the heat conducting fin 83 includes a substrate 832 and a plurality of plate-like fin elements 831 extending integrally from the surface of the substrate 832 vertically. The back surface of the substrate 832 is attached in thermal contact with the metal plate 66 so that each fin element forms a partition wall 831. Further, the rising tip side of the fin element 831 is configured to contact the inner surface of the front plate 811 of the cover body 81, and adjacent fin elements (partition walls) 831 and a substrate 832 in the internal space of the cover body 81. A plurality of air flow paths P surrounded by the front plate 811 of the cover body 81 are formed. Each fin element 831 is attached so as to extend in the vertical direction, and the lower end of each air flow path P faces the air introduction port 81a and the upper end faces the air outlet port 81b.

Furthermore, in this embodiment, a dehumidifying fan F is installed above the air outlet 81b, and the forced air from the air inlet 81a to the air outlet 81b is sucked up from the bottom by this fan F. Is being distributed.

  With such a configuration, air to be dehumidified can flow through each air circulation path P at a sufficiently low speed for condensation, and since there are a plurality of air circulation paths P, sufficient dehumidifying ability can be exhibited. it can. Further, if the air flow to the heat absorbing / generating surface 64c is made only by the fan F, sufficient air cannot be brought into thermal contact with the heat absorbing / generating surface 64c, and the air flow becomes uneven. Thus, where the dehumidifying efficiency cannot be increased to the maximum, a plurality of air flow paths P are formed by the partition walls 831 inside the cover body 81, and the flow rate of these air flow paths P is changed to the air inlet 81a or the air outlet 81b. Therefore, the maximum dehumidifying ability of the Peltier module 51 can be exhibited.

  Further, as shown in FIG. 7 and the like, the dew condensation section 8 is provided below the temperature adjusting Peltier module 51 and its heat conduction fins 52, and on the flow path of the air after dehumidification discharged from the dehumidifying fan F. The temperature adjusting Peltier module 51 is arranged in the middle. With this configuration, the problem that the heat conducting fins 52 of the temperature adjusting Peltier module 51 are condensed during cooling can be avoided by touching the low-humidity air discharged from the fan F of the dehumidifying mechanism 6B. On the other hand, the temperature of the low-temperature air discharged from the fan F of the dehumidifying mechanism 6B can be adjusted more quickly by the temperature control system, and the fluctuation of the internal temperature of the casing 2 can be reduced as much as possible.

3 denotes a control air generating space that surrounds the mist discharge port 64, the humidity adjusting Peltier module 64, the temperature adjusting Peltier module 51, and the like. The partition wall W defines the inside of the casing. The space S is partitioned into the control air generation space and the plant growing space. The partition wall W is provided with a communication path W1 that allows the control air generation space and the plant growth space to communicate with each other, and the air whose temperature and humidity are adjusted in the control air generation space is possible through this communication path. It is configured to be fed into the plant growing space in a state that is not uneven.

  Finally, the control of the LED lighting device 3, the temperature adjusting Peltier module 51, the dehumidifying Peltier module 64, the water mist generator 63, the fan F, etc. will be described in addition. These are controlled by a drive control signal from a control mechanism 7 accommodated in the sub casing 4, for example.

  As schematically shown in FIGS. 8 and 9, the control mechanism 7 is a computer including a CPU 701, a memory 702, an input / output interface circuit 703, an amplifier circuit 704, a communication interface 705, etc., and is stored in the memory 702. Functions of the temperature control circuit 71, the humidity control circuit 72, the light control circuit 73, the fan control circuit 74, and the like are exhibited by the cooperation of the respective units based on the predetermined program. Each of these control circuits 71 to 74 can be rephrased as having a programmable logic circuit, an input / output interface 703 and an amplifier circuit 704 corresponding thereto, and a temperature sensor, a humidity sensor, etc. (not shown) provided separately. Based on detection signals from various sensors, a predetermined drive control signal is output, and the LED lighting device 3, the temperature adjusting Peltier module 51, the humidity adjusting Peltier module 64, the water mist generating unit 63, the fan F, etc. Control.

  The control mechanism 7 is configured to be communicable with another information processing apparatus such as a personal computer via a connection connector such as a USB, and the environmental information (temperature, humidity, etc.) of the casing internal space S is used as the other information processing apparatus. It can be sent to the memory of the device or displayed on a display or the like. In addition, environment settings (temperature setting, humidity setting, light intensity, color setting, etc.) can be performed by issuing a command signal from the other information processing apparatus. Of course, the control mechanism 7 may be provided with a display unit or an operation unit so that it can operate independently.

  The temperature control circuit 71 of the control mechanism 7 is a Peltier module control circuit and is configured to generate a drive control signal as follows.

  That is, as shown in FIG. 10, the temperature control circuit 71 includes a calculation unit 71a and a current control unit 71b. The calculation unit 71a calculates the difference between the command signal value and the actual measurement value from the sensor. The current control unit 71b outputs a drive control signal having a current value corresponding to the difference to the Peltier module 51. The drive control signal generated by the current controller 71b is an intermittent signal in which ON / OFF is repeated as shown in FIG. 12, and the Peltier module is changed by changing the ratio (duty ratio) of the ON / OFF time. The supply current to 51 is controlled. The ON voltage is set to the maximum voltage determined by the maximum heat dissipation capability of each Peltier module 51 due to the configuration of the heat conduction fins 52 (or 65) and the fan F, or a voltage slightly lower than that. The maximum voltage here may be obtained, for example, by experiments in advance.

  That is, if the heat dissipation capability is infinite, the Peltier module 51 has a linear relationship between the applied voltage (current) and the heat generation amount (heat absorption amount) from 0 to the rated voltage (rated current). As shown in FIG. 13, the maximum heat dissipation capability is finite, and when power exceeding the voltage (current) that exhibits the maximum heat dissipation capability is supplied, the excess power changes to heat and absorbs and generates heat. It will flow backwards and your ability will drop. If the FB control is simply performed under such circumstances, for example, if the electric power is increased in order to lower the environmental temperature, the environmental temperature is raised and the control becomes impossible.

However, according to this embodiment, while changing the duty ratio to control the drive current of the temperature adjusting Peltier module 51, the ON-time voltage is set to be equal to or lower than the voltage determined by the maximum heat dissipation capability, so the duty ratio 100 % (Continuous ON), the maximum heat generation (heat absorption) capability is exhibited, and the heat generation (heat absorption) capability is very linear with respect to the duty ratio until the duty ratio reaches 0%. This effect is shown in FIG. The experiment shown in this figure is performed on a Peltier module having Peltier elements connected in series in two stages as an example. Of course, similar results can be obtained even in a single stage. Here, control of a Peltier element having a heat absorption / heat generation surface thermally connected to a controlled object is performed by applying a voltage of 6V (rated is 12V) at the time of ON, and the other Peltier element has a duty ratio of 100% and a voltage of 12V. It is fixed and driven. From this figure, it can be seen that linear control characteristics are obtained. As a result, the control of the Peltier module 51 is facilitated, and the above-described problems can be avoided.

  In the humidity control circuit 72, a dehumidification control circuit (not shown) for controlling the dehumidification Peltier module 64 is also a Peltier module control circuit similar to the temperature control circuit 71, and efficiently controls the dehumidification Peltier module 64. I am doing so.

  The present invention is not limited to the above embodiment. For example, the form of the cover body is not limited to the illustrated example, and various modifications can be made with respect to the shape of the air inlet and the air outlet. Further, the air flow path is not limited to the one that extends vertically, but may be one that extends or curves in another direction. Furthermore, the water discharged to the outside by dehumidification may be guided again to the humidification mechanism (for example, a water tank) and reused.

  Further, the fan may not be provided on the air outlet side but may be provided on the air inlet side so as to send air into the cover body. In such a case, it is better if the air outlet port has a function for adjusting the flow rate of the air flow path.

  In addition, while the Peltier module is controlled by changing the voltage or current at the time of ON, the ON / OFF time ratio is the heat dissipation capability of the Peltier module when the voltage or current value at the time of ON is raised to the rated value. You may make it keep at a fixed ratio within the fixed maximum ON / OFF ratio.

  Further, when the temperature control system performs temperature control exceeding the temperature control capability of only the temperature adjusting Peltier module 51, the dehumidifying Peltier module 64 may be switched and driven for temperature control. For this reason, for example, even when the temperature suddenly changes due to some unforeseen circumstances, the temperature can be quickly restored to normal, and it is possible to avoid a large damage to the plant. This is because sudden changes in temperature often cause more damage to plants than sudden changes in humidity.

  Of course, this dehumidifying mechanism may be applied not only to the plant growing apparatus but also widely to other devices.

  In addition, the present invention is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

The whole perspective view of the plant breeding device in one embodiment of the present invention. The front view of the casing in the embodiment. The sectional side view which shows the internal structure of the casing in the embodiment. The sectional side view which shows the cover body, fan, etc. in the embodiment. The perspective view of the cover body in the embodiment. The front view which shows the cover body, fan, etc. in the same embodiment. The principal part front view which looked at the rear wall inner surface of the casing in the embodiment from the front. The typical equipment block diagram of the control mechanism in the embodiment. The functional block diagram of the control mechanism in the embodiment. The functional block diagram of the temperature control circuit (or humidity control circuit) in the embodiment. The wave form diagram which shows the waveform of the drive control signal to the Peltier module in the same embodiment. The experimental data which show the control result of the Peltier module in the embodiment. The characteristic view which shows the heat absorption-and-release characteristic of the Peltier module at the time of performing the conventional control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Plant growing apparatus 2 ... Casing 21-26 ... Wall body 3 ... LED lighting apparatus 64 ... Peltier module 64c ... Absorption-and-heat generation surface 81 ... Cover body 81a ... The air inlet 81b... The air outlet 831.
S: Casing internal space (dehumidification target space)
F ... Fan P ... Air flow path

Claims (6)

A plant growing apparatus comprising a casing forming a space capable of accommodating plants therein, an LED lighting device for irradiating light in the space, and a dehumidifying mechanism for dehumidifying the space,
The internal space of the casing is partitioned by a partition wall into at least a control air generation space where air is dehumidified and a plant growth space where plants are grown,
The dehumidifying mechanism is a hollow one having a Peltier module attached so as to penetrate the wall of the casing and having an absorption / heat generation surface facing the control air generation space, and an air inlet and an air outlet. A cover body attached to the heat absorption and heat generation surface of the Peltier module on the casing inner space side, a fan attached to an air inlet or an air outlet of the cover body, and an inner space of the cover body. A partition wall extending in a vertical direction that forms a plurality of parallel air flow paths with a lower end facing the air inlet and an upper end facing the air outlet, and an opening area of the air inlet or the air outlet, or The opening shape controls the flow rate of the air flow path,
A communication path that connects the control air generation space and the plant growing space is provided on the control air generation space side of the partition wall, and air that has passed through the dehumidification mechanism and has risen in the control air generation space is provided. The plant growing device is configured to return to the plant growing space after being lowered along the communication path.   The plant growing device according to claim 1, wherein the partition wall is a heat conduction fin attached to the heat absorbing and generating surface and thermally connected thereto.   The plant growing device according to claim 1 or 2, wherein an opening area of the air introduction port or the air outlet port is made variable so that a flow rate of air flowing through the air circulation path can be adjusted.   The plant according to claim 1, 2 or 3, wherein the moisture condensed by the dehumidifying action is introduced into a receiving portion provided at the lower end portion of the cover body and can be discharged from the receiving portion to the external space by a drain tube. Training device.   The plant growing apparatus according to claim 1, 2, 3, or 4, wherein the cover body is formed by attaching a heat insulating material to the heat insulating material itself or a plate material.   A temperature control system for adjusting the temperature of the internal space of the casing is further provided, and the temperature control system includes a temperature adjustment Peltier module attached through the wall body, and the temperature adjustment Peltier module The plant growing device according to claim 1, 2, 3, 4, or 5, wherein a flow path for allowing the air discharged from the fan of the dehumidifying mechanism to reach the dehumidifying target space side of the module is formed.