JPH0210932Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a small-sized hydroponic cultivation device suitable for growing daikon radish, shimeji mushrooms, and other plants that can be grown hydroponically at home.

(Prior Art) What is important in hydroponic cultivation is that the seeds on the nursery board are exposed to water and air alternately, and the higher the frequency, the more desirable.

Conventionally, as shown in Fig. 5, there is a device that automatically starts draining when the water level rises above the height of the seedbed plate 3, and repeats the water level rise again when the water level falls below the seedbed plate (in actual practice). (Sho 51-123940).

This is done by placing a seedbed plate 13 in a cultivation tank 2 installed above the water storage tank 1 at a distance from the bottom of the tank, and attaching the tip of the siphon pipe 11 connected to the bottom of the cultivation tank 2 to the bottom of the water storage tank 2. It has 10 openings.

Water storage tank 1 and cultivation tank 2 are water supply pipes 8 with pump 4
are connected.

The drainage capacity of the siphon pipe 11 per unit time is slightly larger than the pumping capacity of the pump 4. Further, the top of the siphon pipe 11 is located at a higher position than the seedbed board 13.

Therefore, when the water level in the cultivation tank 2 rises due to water pumping and reaches the top of the siphon pipe 11 beyond the height of the seedbed, drainage through the siphon pipe 11 begins.

Since the drainage capacity is greater than the water pumping capacity, the water level in the cultivation tank 2 gradually decreases. When the water level drops to the opening 10 and the water in the cultivation tank 2 disappears, the siphon action stops and the water level begins to rise again.

By repeating the above operation, the water level moves up and down, and as a result, water and air alternately come into contact with the seeds on the seedbed board.

As mentioned above, the higher the frequency of alternate contact with seeds, water, and air, the better. To increase this frequency,
By bringing the heights of the tops of the seedbed 13 and siphon pipe 11 close to the bottom of the cultivation tank 2, the distance over which the water level rises and falls between the seedbed board 13 and the opening 10 is shortened, and the time required to supply water to the cultivation tank 2 is shortened. It is possible to reduce it.

However, the cultivation tank may be filled with ore that has the effect of preventing water from corroding.
3 is required to be raised by the amount of allowance from the bottom of the cultivation tank 1, so it is impossible to lower the seedbed board.

Also, as shown by the two-dot chain line in Fig. 5, the siphon tube 1
By making the height of the opening 10 of No. 1 close to the top of the seedbed board 13 and the siphon pipe 11, water supply is started when the water level is slightly lower than the seedbed board 13, and the frequency of vertical movement of the water surface can be increased. I can do it. However, in this case, the water on the bottom side of the cultivation tank 2 remains for a long period of time, and if ore which has the effect of preventing corrosion of the water is not added, a problem arises in which the remaining water corrodes.

The present invention drains water from the bottom of the cultivation tank to prevent water from stagnation in the cultivation tank, and also stops the drainage before the water surface reaches the upper opening 10 of the siphon.
This study reveals a hydroponic cultivation device that can increase the frequency of vertical movement.

(Means for solving the problem) In order to achieve the above purpose, the present invention has a water storage tank 1.
a cultivation tank 2 provided above the water storage tank and provided with a porous seedbed plate 13 at a predetermined height position from the bottom plate 21; a pump 4 for pumping water from the water storage tank 1 into the cultivation tank 2; A siphon pipe 11 is provided in the cultivation tank 2 with an opening 10 below the seedling bed plate 13, the top of which is located at a higher position than the seedling bed plate 13, and the other end of which is opened into the water storage tank 1.
and a float 16 which is arranged to be openable and closable with respect to the upper opening 10 of the siphon tube 11 and which operates to open and close at a position higher than the opening 10.
The amount of water discharged by pump 1 is larger than the amount of water pumped by pump 4.

(Operation and Effect) When the water level in the cultivation tank 2 exceeds the height of the opening 10 of the pipe line 12, the float 16 floats and the siphon pipe 11
Open the opening 10 of the cultivation tank 2 and the siphon pipe 11.
communicate.

When the water level further exceeds the height of the seedbed board 13 and reaches the height of the top of the siphon pipe 11, drainage by the siphon pipe 11 is started.

Since the drainage capacity of the siphon pipe 11 is greater than the pumping capacity of the pump, the water level in the cultivation tank 2 gradually decreases, and the float 16 also descends accordingly.

As shown in FIG. 4, when the water level falls to a position above the height X of the upper opening 10 of the siphon pipe 11, the float 16 descends and closes the opening 10.
The flow of water into the siphon pipe 11 is interrupted. At this point, siphoning stops and the water level rises again.

In the case of the present invention, the water level does not fall to the height of the upper opening 10 of the siphon pipe 11, and when the water level falls to the height Y above the opening 10, the opening 10 is blocked by the float 16 to drain water. Therefore, the time interval from the start of drainage to the stop of drainage can be shortened, and the frequency of vertical movement of the water surface can therefore be increased.

Furthermore, even if the position of the opening 10 is lowered, the cultivation tank 2
The lower limit position of the water level in the cultivation tank 2 can be made higher than the position of the opening 10, and when draining water, water can be drained from the bottom side of the cultivation tank 2, and there is no problem of long-term retention of water.

(Example) A cultivation tank 2 smaller than the rectangular water tank 1 is placed on top of the rectangular water tank 1.

A substrate 3 is fixed to the upper surface of the water tank 1 that is not covered by the cultivation tank 2, a water pump 4 is installed on this, and the water pump 41 is immersed in the water of the water tank. Inverted U located higher than tank 2
Both lower ends of the letter-shaped lift pipe 5 are fixed through the substrate 3, and one of the vertical pipe parts 5a is connected to the discharge pipe 4a of the pump by a connecting pipe 6. Bottom plate 21 of cultivation tank 2
A water supply pipe 7 that protrudes briefly upward is penetrated and fixed, and the lower end of the other vertical pipe portion 5b of the water lift pipe 5 and the water supply pipe 7 are connected by a connecting pipe 8, and a hole is drilled in the side surface of the upper end of the water lift pipe 5. One end of the thin tube 9 is inserted into the tank, and the other end of the tube is directed into the cultivation tank 2. As a result, a part of the water pumped from the water storage tank 1 by the pump and pumped into the water pumping pipe 5 via the connecting pipe 6 flows down from the tube 9 into the cultivation tank 2, is supplied to the cultivation tank with air, and the rest The water is supplied to the bottom of the cultivation tank from the water supply pipe 7 via the connecting pipe 8.

A siphon pipe 11 is attached to the substrate 3, which is bent into a semicircular arc shape and whose top is higher than the height of a seedbed board 13 to be described later. One end of the siphon tube penetrates the substrate to extend a laterally described horizontal tube portion 12, and the other end 11b is slidably passed downward through a through hole 31 formed in the substrate 3 to protrude into the water storage tank. Preferably, the position of the upper end of the siphon tube can be adjusted by changing the length of the protrusion from the bottom surface of the substrate. This siphon pipe 11 has a coil spring 11' having approximately the same diameter inside or outside the flexible hose.
When fitted, the elasticity of the coil spring prevents it from being crushed, and at the same time, the other end 11b is held against the edge of the hole 31 of the substrate 3 by friction, and the upper end of the siphon can be maintained at the adjusted height. One end of the siphon tube is connected to a horizontal pipe part 12 passing below the bottom plate 21, and the tip of the horizontal pipe part 12 penetrates the bottom plate 12 of the cultivation tank 2 to open into the cultivation tank 2.

A hollow spherical float 16 is provided in the upper opening 10 of the siphon tube 11 as shown in FIG.

The float 16 has a downward shaft-shaped leg piece 15 and an upward shaft-shaped guide piece 17 protruding from a straight line, and the leg piece 15 is fitted into the opening 10 with ample space.

Inside the cultivation tank 2, there is an upper opening 10 of a siphon pipe 11.
a perforated plate supported by legs at a position higher than the height of
A water-permeable seedbed board 13 made of a net board or the like is accommodated, and a porous sponge board or other seeding mat 1 is placed on top of it.
4 and sow the seeds of the plants to be cultivated. The pine 14 may contain seeds at an appropriate density.

A guide hole 18 is formed in the seedbed board 13 at a position directly above the float 16, and a guide piece 17 of the float 16 is fitted therein with ample space.

Note that the flow rate of water that can flow through the siphon pipe 11 is set slightly higher than the amount of water pumped by the pump. Fill water tank 1 with water and operate the pump.

However, when the water level in the cultivation tank 2 exceeds the upper opening 10 of the siphon pipe 11 due to water pumping, the float 16 floats and opens the upper opening 10 of the siphon pipe 11, and the cultivation tank 2 and the siphon pipe 11 are separated. communicate.

The water level exceeds the height of the seedbed board 13, and the siphon pipe 1
When the height of the top of 1 is reached, drainage is started by the siphon pipe.

Since the pumping capacity of the cultivation tank 2 is lower than the drainage capacity of the siphon pipe, the water level of the cultivation tank 2 gradually decreases, and the float 16 also lowers accordingly. The leg piece 15 of the float 16 is fitted into the upper opening 10 of the siphon pipe, and the guide piece 17 is fitted into the guide hole 18 of the seedbed board 13 with plenty of room, so the floating range is restricted and the water level does not drop. This allows the float to reliably close the upper opening 10 of the siphon tube 11.

By the time the water level falls to the height of the opening 10 of the siphon pipe 11, the float 16 closes the opening 10, and the outflow of water to the siphon pipe 11 is interrupted, at which point drainage by siphon action is stopped and the water level rises again. do.

The seeds on the nursery board 13 alternately come into contact with water and air due to the vertical movement of the water level by repeating the above-mentioned operations.

The float of the present invention can be modified in various designs as long as it opens and closes the siphon pipe 11 based on the vertical movement of the float due to fluctuations in the water surface.

[Brief explanation of the drawing]

Figure 1 is a partially sectional front view of an embodiment of the hydroponic cultivation device of the present invention, Figure 2 is a side view of the same, and Figure 3 is a side view of the same.
The figure is a cross-sectional view showing the installed state of the siphon tube, FIG. 4 is an explanatory diagram of the operation of the float, and FIG. 5 is an explanatory diagram of a conventional example. 1...Water tank, 2...Cultivation tank, 4...Pump,
11... Siphon tube, 16... Float.

Claims (1)

[Scope of utility model registration request] A water storage tank 1 and a bottom plate 2 disposed above the water storage tank.
A cultivation tank 2 equipped with a porous seedbed plate 13 at a predetermined height position from 1; a pump 4 for pumping water from the water tank 1 into the cultivation tank 2; The opening 10 is located at the top of the seed bed plate 13, and the other end is located at a position higher than the opening 10 and is openable and closable with respect to the siphon pipe 11 that opens into the water storage tank 1 and the upper opening 10 of the siphon pipe 11. A hydroponic cultivation apparatus characterized in that the amount of water discharged by the siphon pipe 11 is larger than the amount of water pumped by the pump 4.