JP2000312539A - Plant cultivation equipment - Google Patents

Abstract

(57) [Problem] It is an object of the present invention to efficiently drain a nutrient solution from a culture medium. SOLUTION: A nutrient solution in a culture medium 6 in a container 2 is sucked by a venturi-type suction device 9 and is forcibly drained from a drain passage 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a plant cultivation apparatus.

[0002]

2. Description of the Related Art Conventionally, a culture medium such as sand or ceramic particles is put in a container, a plant is planted in the culture medium, a nutrient solution is supplied to a root end of the plant from a nutrient solution supply path, and a nutrient solution is supplied from the bottom of the container. A hydroponics method of draining water is being carried out. The drainage is performed by forced suction drainage by a vacuum pump. According to such forced drainage drainage, the nutrient solution supplied from above the medium is forcibly sucked to the bottom side, so that the nutrient solution is moved up and down in the medium. Since it is evenly distributed and there is no excess nutrient solution in the medium, it is easy to control the temperature and the growth of harmful bacteria is suppressed, and furthermore, the air in the medium is renewed efficiently. Advantages arise.

[0003]

Conventionally, a vacuum pump has been used for the forced suction drainage. However, the vacuum pump is expensive, the suction efficiency is not sufficient, and the suction energy is wasted. In addition, the vacuum pump has a problem that water is easily clogged or malfunctions.

[0004]

According to the present invention, as a means for solving the above-mentioned conventional problems, a container (2) and a container (2) are provided.
A water-permeable support (3) stretched in the inner lower part, a medium (6) supported on the water-permeable support (3), and an opening on the medium (6) in the container (2). Nutrient solution supply path (7)
A plant cultivation comprising: a drainage channel (8) communicating from the outside of (2) below the support (3); and a venturi-type suction device (9) communicating with the drainage channel (8). An apparatus (1) is provided. Desirably, the medium contains activated carbon or the medium is a mixture of sand and compost.

[0005]

The nutrient solution is dripped from the nutrient solution supply path (7) to the root end of the plant P planted in the medium (6) in the container (2). The nutrient solution is drained from the lower part of the container (2) to a drainage channel (8). At this time, the nutrient solution is forcibly sucked by a venturi-type suction device (9) connected to the drainage channel (8). In the venturi-type suction device (9), the air blown into the device (1) is accelerated by the constriction S, and the drainage channel (8) is evacuated. When air is blown, energy efficiency is better than when air is sucked by a vacuum pump.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 3. In the plant cultivation apparatus (1) shown in the figure, (2)
Is a container, and in the lower part of the container (2), a perforated plate (3) as a water-permeable support is disposed, and the perforated plate (3) is
It is supported from the bottom of (2) by a spacer (4).

[0007] The root plate (3) is covered with a root protection sheet (5), on which a medium (6) is supported, and a plant P is planted on the medium (6). The medium (6) is, for example, sand, ceramic balls, peat moss, activated carbon and the like. Activated carbon is a desirable medium because it adsorbs organic substances and microorganisms, preserves water and nutrients, and removes odors.
Two or more kinds of the above-mentioned media may be mixed. Furthermore, compost may be mixed with the above-mentioned culture medium, especially sand. The plants include, for example, vegetables such as tomato, cucumber, eggplant, lettuce, honeybee, spinach, radish and carrot, fruits such as melon and strawberry, flowers such as gerbera, tulip, begonia and orchid.

[0008] A nutrient solution supply path (7) is arranged above the culture medium (6) with the opening facing the root end of the plant P. Further, a drainage channel (8) communicates with the bottom of the container (2), and a venturi-type suction device (9) is interposed in the drainage channel (8).

As shown in FIGS. 2 and 3, the suction device (9) has a lid cylinder (11) having a suction port (10) at an upper end and a lid cylinder (1).
1) an air inlet (12) connected to the side surface,
(11) and a lower plug (13) screwed to a lower portion of the lower plug (13), and a water conduit (14) is provided through the lower plug (13).
3) An upper short cylinder (15) is protruded from the upper end, and the upper short cylinder is
A flange (16) is provided around the upper end of (15), and the lower plug is provided.
(13) A lower short cylinder (17) extends from the lower end.

In the above structure, a fertilizer. A nutrient solution obtained by dissolving a nutrient or the like in water is instilled into the root end of the plant from the nutrient solution supply channel (7). When compost is mixed in the medium,
The nutrient solution may be water alone. Further, air is blown from an air blower (not shown), a compressor, or the like through an air inlet (12) of the suction device (9).
The water flows into the headrace (14) while being accelerated by the constriction S formed between the inner upper surface of (1) and the flange (16) of the upper short cylinder (15). A vacuum is established, and the nutrient solution in the culture medium (6) of the container (2) is forcibly sucked into the drainage channel (8).

Due to such forced aspiration, the nutrient solution in the medium (6) spreads up and down uniformly, and excess nutrient solution is removed from the medium (6).
Since it is not present in the medium, it is easy to control the temperature, the propagation of harmful bacteria is suppressed, and the air in the medium (6) is effectively renewed. When adjusting the suction and drainage of the nutrient solution, the lower plug (13) of the suction device (9) is screwed or loosened into the lid cylinder (11), and the upper short cylinder of the lower plug (13) is adjusted. (15) Flange
The width of the narrowed portion S between (16) and the inner upper surface of the lid tube body (11) is reduced or enlarged, and the air passing through the narrowed portion S is accelerated or decelerated. Further, screw the lid tube (11) into the lower plug (13).
If the flange (16) of the upper short cylindrical body (15) is brought into close contact with the inner upper surface of the lid cylindrical body (11), the inflow of air is shut off and the suction and drainage of the nutrient solution is stopped.

FIG. 4 shows another embodiment of the suction device (19). Inside the suction device (19), a stenosis portion S 'is provided at the center.
Is formed, and a drainage channel (8) communicates with the constriction S 'from the side of the suction device (19).

[0013]

According to the present invention, the nutrient solution can be efficiently sucked and drained from the culture medium in the container in the nutrient solution cultivation using a Venturi-type suction device having a simple structure and easy maintenance. .

[Brief description of the drawings]

 1 to 3 show one embodiment of the present invention.

FIG. 1 is an explanatory sectional side view

FIG. 2 is an exploded perspective view of a suction device.

FIG. 3 is a sectional side view of the suction device.

FIG. 4 is a side sectional view of a suction device according to another embodiment.

[Explanation of symbols]

 1 Plant cultivation device 2 Container 3 Eye plate (water-permeable support) 6 Medium 7 Nutrient solution supply channel 8 Drainage channel 9 Venturi-type suction device

Claims (3)

[Claims] Claims: 1. A container, a water-permeable support stretched in a lower part of the container, a medium supported on the water-permeable support,
A nutrient solution supply passage that is open above the culture medium in the container, a drainage passage communicating from the outside of the container below the support, and a venturi-type suction device that communicates with the drainage passage; Plant cultivation apparatus characterized by comprising: 2. The medium according to claim 1, wherein the medium contains activated carbon.
Plant cultivation equipment described in 3. The plant cultivation apparatus according to claim 1, wherein said medium is a mixture of sand and compost.