JP7645529B2 - Drainage and storage equipment - Google Patents

Description

The present invention relates to a drainage device and a water storage device.

A known hydroponic cultivation technique is to place growing bodies such as plant seedlings in the upper part of a tank called a cultivation bed, and provide a culture solution in the lower part of the tank, so that the growing bodies soak up the culture solution as they grow (for example, Patent Document 1). The cultivation bed is equipped with a water supply device for supplying the culture solution and a drainage device for discharging the culture solution, and is configured so that the culture solution in the tank can be discharged through a drainage path provided in the drainage device.

As a conventional drainage device, the drainage device 100' shown in FIG. 9A is known. The conventional drainage device 100' is composed of a front-side drainage section 120' attached to the front surface 32 side of the floor board 30 of the cultivation bed, and a back-side drainage section 150' attached to the back surface 34 side of the floor board 30.

9A and 9B, the front side drainage section 120' includes a cylindrical front side connecting section 130' and a flange section 140' extending radially outward from the entire upper end of the front side connecting section 130', and the back side drainage section 150' includes a back side connecting section into which the front side connecting section 130' of the front side drainage section 120' can be inserted. Corresponding threads are formed on the outer peripheral surface of the front side connecting section 130' of the front side drainage section 120' and the inner peripheral surface of the back side connecting section of the back side drainage section 150', and are configured to be attached to the floor plate 30 by being screwed together, with the flange section 140' of the front side drainage section 120' and the upper end of the back side connecting section of the back side drainage section 150'.

Patent No. 4589773

However, in the conventional drainage device 100', as shown in FIG. 9A, due to the thickness of the flange portion 140' of the surface-side drainage section 120' and intermediate members such as the gasket 180 and washer 190 interposed between the flange portion 140' and the floorboard 30, it is not possible to completely drain the accumulated culture liquid, resulting in problems such as poor cleaning efficiency, accumulation of waste products, and the occurrence of algae (blue-green algae).

The present invention was made in consideration of these problems, and aims to provide a drainage device and water storage device that can completely drain accumulated liquid.

The drainage device according to the present invention is a drainage device that can be attached to a drainage opening formed in a floorboard, and includes a surface-side drainage section provided on the surface side of the floorboard, and a back-side drainage section provided on the back side of the floorboard and attachable to the surface-side drainage section. The surface-side drainage section and the back-side drainage section are configured to form a drainage path that penetrates from the surface side to the back side of the floorboard, and the surface-side drainage section includes a cylindrical surface-side connecting section that extends into the drainage opening and to which the back-side drainage section is attached, and a surface-side flange section that extends radially outward from the surface-side end of the surface-side connecting section, and the surface-side flange section has a flow channel that extends from the outer periphery of the surface-side flange section to the drainage path.

In the drainage device according to the present invention, the water flow channels may be formed in a plurality at predetermined intervals in the circumferential direction of the front flange portion.

The water storage device according to the present invention is characterized by comprising the above-mentioned drainage device and a water tank having the floor plate and the drainage opening.

In the water storage device according to the present invention, the back-side drainage section may include a back-side flange section capable of clamping the floor plate between the front-side flange section of the front-side drainage section, and a gasket may be provided between the back surface of the floor plate and the back-side flange section of the back-side drainage section.

In the water storage device according to the present invention, the gasket may have a hole at a position that aligns with the drainage path, and the hole in the gasket may have a diameter smaller than the drainage opening in the floor plate.

The water storage device according to the present invention may further include a water level adjustment device for adjusting the water level of the tank, and the surface side flange portion of the surface side drainage portion may have an opening, and the water level adjustment device may have an outer peripheral surface that can be engaged with the opening of the surface side flange portion.

In the water storage device according to the present invention, the outer peripheral surface of the water level adjustment device and the opening of the front flange portion may have corresponding inclined surfaces.

The water storage device according to the present invention may further include a plug member capable of blocking water from entering the opening of the front flange portion, and the water level adjustment device may be configured to be capable of blocking water from entering the opening by the plug member.

The present invention makes it possible to provide a drainage device and a water storage device that can completely drain accumulated liquid.

1 is a schematic diagram showing a water storage device according to an embodiment of the present invention; FIG. 2 is an exploded view showing the drainage device according to the embodiment of the present invention. FIG. 1 is a cross-sectional view showing a drainage device according to an embodiment of the present invention. FIG. 2 is a perspective view showing a surface-side drainage section according to the embodiment. FIG. 2 is a plan view showing a surface-side drainage section according to the embodiment. 2A and 2B are diagrams showing a gasket according to the embodiment. FIG. 2 is a diagram showing a water level adjusting device according to the present embodiment. FIG. 2 is a cross-sectional view showing a state in which a water level adjustment device is used in the water storage device according to the present embodiment. 4A and 4B are diagrams showing a plug member according to the embodiment; 4 is a cross-sectional view showing a state in which a plug member is used in the water storage device according to the embodiment. FIG. FIG. 1 is a cross-sectional view showing a conventional water storage device. FIG. 13 is a schematic diagram showing a conventional surface-side drainage section.

The best mode for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. The drawings are schematic diagrams in which emphasis, omissions, and proportions have been appropriately adjusted to illustrate the present invention, and may differ from the actual shapes, positional relationships, and proportions.

[Configuration of the water storage device according to this embodiment]
1 and 2, the water storage device 10 according to this embodiment includes an aquarium 20 having a floor plate 30 with a drainage opening 36 formed therein, and a drainage tool 100 that can be attached to the drainage opening 36. The water storage device 10 also includes a water level adjustment tool 200 (see FIGS. 6 and 7) for adjusting the water level of the culture solution contained in the aquarium 20, and a plug member 250 (see FIGS. 8A and 8B) for stopping drainage from the drainage tool 100.

[Configuration of the aquarium (cultivation bed)]
The water tank 20 is a container capable of storing liquid, and in this embodiment, it is a cultivation bed formed in a tub shape capable of containing a culture solution. Specifically, as shown in Fig. 1, the water tank 20 includes a cultivation bed body 20A having a cross section that is approximately U-shaped with the top surface and both ends in the longitudinal direction being open, and a pair of end members (not shown) that close both ends of the cultivation bed body 20A, and is formed as a whole in a tub shape capable of containing a culture solution.

As shown in FIG. 2, the cultivation bed body 20A includes a floor plate 30 formed in a long rectangular shape and a pair of side plates 40 extending from both short side edges of the floor plate 30 toward the surface 32. At least a portion of the floor plate 30 (in this embodiment, one end in the long side direction and the center in the short side direction) is provided with a drainage opening 36 for discharging the culture solution in the cultivation bed body 20A.

The drainage opening 36 is formed by punching a part of the floor plate 30 into a circle by pressing or the like, and has a diameter that allows the surface side connecting part 130 of the surface side drainage part 120 of the drainage device 100 to be inserted. As shown in FIG. 2, the floor plate 30 is slightly inclined near the drainage opening 36 toward the drainage opening 36 so that the culture solution in the cultivation bed body 20A can easily flow toward the drainage opening 36.

The cultivation bed body 20A is formed by forming a metal plate material by roll forming. Here, roll forming is a sheet metal processing method in which a flat material is formed into a desired cross-sectional shape by using multiple sets of forming rolls. The cultivation bed body 20A according to this embodiment is formed by such roll forming, so that a large cultivation bed that is continuous along the longitudinal direction without any joints can be formed, which has the advantage that the risk of leakage of culture solution is extremely low. In this embodiment, the cultivation bed body 20A has a long shape with a longitudinal length of, for example, about 3 m to 18 m and a lateral length of, for example, about 60 cm, but is not limited to this, and the longitudinal and lateral lengths can be set arbitrarily.

Metals used for the cultivation bed body 20A include, for example, galvalume steel, stainless steel, aluminum, copper, iron, etc., and galvalume steel and stainless steel are particularly suitable, but are not limited to these. In addition, it is preferable that the cultivation bed body 20A is subjected to various known coating treatments to impart resistance to the culture solution (corrosion prevention) in order to prevent the occurrence of metal damage.

[Configuration of drainage fixture]
1 and 2, the drainage device 100 includes a front-side drain section 120 provided on the front surface 32 side of the floor board 30 of the aquarium 20, and a back-side drain section 150 provided on the back surface 34 side of the floor board 30 and attachable to the front-side drain section 120. The front-side drain section 120 and the back-side drain section 150 are connected to each other, forming a drainage path 110 that passes through the floor board 30 from the front surface 32 side to the back surface 34 side, as shown in FIG.

As shown in FIG. 2, the front-side drainage section 120 includes a cylindrical front-side connecting section 130 that extends into the drainage opening 36 and to which the back-side drainage section 150 is attached, and a front-side flange section 140 that extends radially outward from the front-side end (upper end) of the front-side connecting section 130.

As shown in Figures 2 and 4A, the front side connecting part 130 is formed in a cylindrical shape with a diameter that can be inserted into the drainage opening 36, and its outer circumferential surface has a screw thread that can be screwed into the screw thread of the back side drainage part 150, which will be described later.

As shown in Figures 4A and 4B, the surface side flange portion 140 has an opening 142 that is continuous with the inner peripheral surface of the surface side connecting portion 130, and one or more (four in this embodiment) flow channels 145 that extend from the outer peripheral portion of the surface side flange portion 140 to the opening 142 (drainage path 110).

The opening 142 is configured to selectively mount both the water level adjustment device 200 and the plug member 250. Specifically, the opening 142 has an inclined surface 143 that narrows from the opening end (upper end) toward the upper end of the front side connecting portion 130 (i.e., toward the rear surface 34 side of the floorboard 30) as shown in FIG. 4A. The inclined surface 143 is configured to be able to engage with the intermediate inclined portion 220 of the water level adjustment device 200 (described later) as shown in FIG. 6 and FIG. 7, and is configured to be able to engage with the water stop surface 252 of the plug member 250 (described later) as shown in FIG. 8A and FIG. 8B. It is preferable that the inclined surface 143 has an inclination angle corresponding to the intermediate inclined portion 220 of the water level adjustment device 200 and the water stop surface 252 of the plug member 250, specifically, an inclination angle that allows surface contact with each other.

The flow channels 145 are grooves (gaps) for allowing the culture medium in the tank 20 to flow smoothly toward the drainage path 110, and are formed at predetermined intervals around the circumference of the front flange portion 140. In other words, as shown in Figures 4A and 4B, the front flange portion 140 has a number of flange pieces 140a to 140d that extend radially outward from the front end (upper end) of the front connecting portion 130, and gaps that function as the flow channels 145 are formed between each of the flange pieces 140a to 140d.

From the viewpoint of preventing residual liquid, it is preferable that multiple flow channels 145 are formed as shown in the figure, and more preferably, they are formed with a predetermined phase difference (e.g., 45°) over all 360° directions as shown in the figure. However, this is not limited to this, and various arbitrary configurations can be adopted, such as a configuration in which only one flow channel 145 is formed.

The drainage device 100 according to this embodiment is configured so that the surface-side flange portion 140 of the surface-side drainage section 120 is in direct contact with the surface 32 of the floor board 30 of the aquarium 20, without placing an intermediate member such as a gasket (sealing member) or washer (friction reducing member) between the surface-side flange portion 140 of the surface-side drainage section 120 and the surface 32 of the floor board 30 of the aquarium 20. As a result, the drainage device 100 according to this embodiment can further prevent liquid from remaining in the aquarium 20.

As shown in Figures 2 and 3, the back side drainage section 150 includes a cylindrical back side connecting section 170 into which the front side connecting section 130 of the front side drainage section 120 can be inserted, and a back side flange section 160 that extends radially outward from the end (upper end) of the back side connecting section 170 on the floorboard 30 side.

The back side connecting part 170 is generally formed in a bottomed tubular shape, and includes a piping connection part 175 that extends from the longitudinal side of the back side connecting part 170 in a direction perpendicular to the longitudinal direction of the back side connecting part 170. The piping connection part 175 is formed in a cylindrical shape, and is configured so that a drainage pipe (not shown) can be attached.

The back side connecting part 170 has a diameter that allows the front side connecting part 130 of the front side drainage part 120 to be inserted, and the inner surface of the upper end side of the back side connecting part 170 has a thread that can be screwed into the thread formed on the front side connecting part 130 of the front side drainage part 120.

The back flange portion 160 extends radially outward from the entire upper end of the back connection portion 170, and is configured to be able to clamp the floor plate 30 of the water tank 20 between the back flange portion 160 and the front flange portion 140 of the front drainage portion 120. In this embodiment, the back flange portion 160 has a size that is able to cover and conceal the gasket 180 and washer 190 described below, and is formed into a roughly octagonal shape overall, but is not limited to this and various arbitrary shapes can be adopted.

As shown in Figures 2 and 3, the drainage device 100 further includes a gasket (sealing member) 180 disposed between the back surface 34 of the floorboard 30 and the back surface drainage section 150, and a washer (friction reducing member) 190 disposed between the gasket 180 and the back surface drainage section 150.

As shown in FIG. 2, the gasket 180 is an elastic member formed in a circular ring shape with a hole 182 in the center, and has one or more linear protrusions 181a-181c extending around the entire circumference on its surface. The linear protrusions 181a-181c are ridges formed to increase the liquid-tightness between the gasket 180 and the rear surface 34 of the floorboard 30, and multiple linear protrusions 181a-181c (three in this embodiment) with different diameters are arranged concentrically to enable multi-stage sealing.

The hole 182 of the gasket 180 is formed in a position that aligns with the drainage opening 36 (drainage path 110), and the opening diameter (diameter) d of the hole 182 is designed to be smaller than the opening diameter (diameter) D of the drainage opening 36 provided in the floor plate 30 of the water tank 20 as shown in FIG. 5, and to have a diameter that allows the surface side connecting part 130 to be inserted.

The gasket 180 having the above configuration is disposed between the rear surface 34 of the floor plate 30 and the rear surface flange portion 160 of the rear surface drain portion 150 so that the center of the hole 182 coincides with the center of the drain opening 36. As a result, when the floor plate 30 of the aquarium 20 is clamped by the drainage device 100, the gasket 180 is compressed in its thickness direction, and the hole 182 of the gasket 180 stretches radially inward (in the direction in which the diameter d of the hole 182 becomes smaller), thereby preventing water leakage from the connection between the drainage device 100 and the drain opening 36.

The washer 190 is formed in a circular ring shape of the same shape and size as the gasket 180, and is made of a material with a lower coefficient of friction than the gasket 180, for example, a resin material such as rubber or silicone. By including the washer 190 made of such a material, the drainage device 100 according to this embodiment can reduce the frictional resistance between the gasket 180 and the back side drainage section 150, thereby preventing damage to the gasket 180.

As shown in Figures 1 to 3, the drainage device 100 having the above configuration is assembled to the aquarium 20 by inserting the surface side connecting part 130 of the surface side drainage part 120 into the drainage opening 36 from the surface 32 side of the floor board 30, arranging the gasket 180 and washer 190 concentrically around the surface side connecting part 130 from the back surface 34 side of the floor board 30, and connecting (screwing) the back surface side connecting part 170 of the back surface side drainage part 150 to the surface side connecting part 130.

By assembling the drainage device 100 to the aquarium 20 in this manner, the culture liquid in the aquarium 20 can be drained through the flow channel 145 formed in the front-side flange portion 140 of the front-side drainage portion 120 and the drainage path 110 formed by the front-side drainage portion 120 and the back-side drainage portion 150 to a drainage pipe connected to the pipe connection portion 175 of the back-side drainage portion 150.

[Configuration of water level adjustment device]
As shown in Figure 6, the water level adjustment device 200 is formed into an overall cylindrical shape, and has a large diameter portion 230 formed on the upper end side, a small diameter portion 210 formed on the lower end side, and an intermediate inclined portion 220 formed between the large diameter portion 230 and the small diameter portion 210.

As shown in FIG. 7, the small diameter portion 210 has an outer diameter smaller than the inner diameter of the opening 142 of the front side flange portion 140 of the front side drainage portion 120 and the front side connecting portion 130, and is configured to be insertable into these openings 142 and front side connecting portion 130. The intermediate inclined portion 220 has an outer peripheral surface that is inclined so that the diameter decreases from the lower end of the large diameter portion 230 to the upper end of the small diameter portion 210, and is configured so that the outer peripheral surface of the intermediate inclined portion 220 engages with the opening 142 when the small diameter portion 210 is inserted into the opening 142 and the front side connecting portion 130. More preferably, the outer peripheral surface of the intermediate inclined portion 220 is formed in a tapered shape having an inclination angle that can be fitted into the inclined surface 143 of the opening 142 of the front side flange portion 140.

On the other hand, the large diameter portion 230 has an outer diameter larger than the inner diameter of the opening 142 of the front side flange portion 140 of the front side drainage portion 120 and the front side connecting portion 130, and has an inner diameter approximately the same as the inner diameter of the opening 142 and the front side connecting portion 130. As a result, the large diameter portion 230 is configured so that the plug member 250 can be inserted liquid-tightly therein. In addition, the intermediate inclined portion 220 has an inner peripheral surface that can be liquid-tightly engaged with the water-stopping surface 252 of the plug member 250 described later when the plug member 250 is inserted into the large diameter portion 230. More preferably, the inner peripheral surface of the intermediate inclined portion 220 is formed in a tapered shape having an inclination angle that allows the water-stopping surface 252 of the plug member 250 to fit into it.

The water level adjustment device 200 having the above configuration is configured so that when the small diameter portion 210 of the water level adjustment device 200 is inserted into the opening 142 of the surface side flange portion 140, the intermediate inclined portion 220 of the water level adjustment device 200 fits into the inner surface of the opening 142. As shown in FIG. 7, by attaching the water level adjustment device 200 to the surface side drainage portion 120, the water level of the water storage device 10 can be set to a desired water level according to the height of the large diameter portion 230. The height of the large diameter portion 230 can be set arbitrarily according to the desired water level of the culture solution. In addition, the water level of the culture solution can be changed arbitrarily by replacing it with another water level adjustment device of a different height or by making the height of the large diameter portion 230 variable.

[Configuration of plug member]
As shown in Fig. 8A, the plug member 250 is formed in a truncated cone shape, and has a water-stopping surface 252 on its outer circumferential surface that can be liquid-tightly fitted into the opening 142 of the surface-side drainage section 120 or the water level adjustment device 200 to stop water. That is, the plug member 250 is configured so that it can be directly inserted into the opening 142 of the surface-side drainage section 120 to stop water (see Fig. 8B), and can also be inserted into the water level adjustment device 200 to stop water. Preferably, the water-stopping surface 252 has an inclination angle that can be fitted into the inclined surface 143 of the opening 142 of the surface-side drainage section 120 and the inner circumferential surface of the intermediate inclined portion 220 of the water level adjustment device 200.

As shown in FIG. 8B, the plug member 250 preferably has a height that allows it to fit seamlessly into the opening 142 of the surface-side drainage section 120 and the water level adjustment device 200 when inserted therein. The plug member 250 has a handle 255 on its upper end surface, allowing it to be easily removed even when it is seamlessly fitted into the opening 142 of the surface-side drainage section 120 and the water level adjustment device 200.

The material of the plug member 250 can be any waterproof material without particular restrictions, but it is preferable that it be made of an elastic material such as rubber, so that it can be elastically deformed when inserted into the opening 142 of the surface-side drainage section 120 and the water level adjustment device 200 to improve liquid-tightness.

[Advantages of the drainage device and water storage device according to this embodiment]
As described above, in the drainage device 100 of this embodiment, the surface side flange portion 140 of the surface side drainage section 120 has a flow channel 145 extending from the outer periphery of the surface side flange portion 140 to the drainage path 110, so that it is possible to completely drain the culture solution (liquid) in the aquarium 20.

In addition, the drainage device 100 according to this embodiment has multiple water flow channels 145 formed at predetermined intervals around the circumference of the front flange portion 140, which allows for quicker drainage compared to when only one water flow channel 145 is formed, and allows for drainage from two or more directions, which has the advantage of making it even easier to prevent residual liquid.

Furthermore, the water storage device 10 according to this embodiment has the advantage that it is possible to prevent water leakage from the connection between the drainage device 100 and the drainage opening 36 by providing a gasket 180 between the rear surface 34 of the floor plate 30 and the rear surface flange portion 160 of the rear surface drainage portion 150.

In particular, in the water storage device 10 according to this embodiment, the gasket 180 has a hole 182 with a diameter smaller than the drainage opening 36 of the floor plate 30. When the floor plate 30 of the aquarium 20 is clamped by the drainage device 100, the gasket 180 is compressed in a direction perpendicular to the radial direction of the gasket 180, and the hole 182 of the gasket 180 extends radially inward (in the direction in which the diameter d of the hole 182 becomes smaller), which has the advantage of further preventing water leakage from the connection between the drainage device 100 and the drainage opening 36.

Furthermore, the water storage device 10 according to this embodiment has an advantage that the water level adjustment device 200 for adjusting the water level in the aquarium 20 has an outer peripheral surface that can be engaged with the opening 142 of the surface side flange portion 140, and therefore the water level of the culture solution (liquid) in the aquarium 20 can be adjusted to a level corresponding to the height of the water level adjustment device 200 simply by inserting the water level adjustment device 200 into the opening 142 of the surface side drainage portion 120.

In particular, in the water storage device 10 according to this embodiment, the outer peripheral surface of the water level adjustment device 200 and the opening 142 of the front flange portion 140 have corresponding inclined surfaces, which has the advantage of making it possible to prevent water leakage from the connection between the water level adjustment device 200 and the opening 142.

The water storage device 10 according to this embodiment further includes a plug member 250 capable of stopping water flow at the opening 142 of the surface side flange portion 140, and the water level adjustment device 200 is configured to be watertight using the plug member 250. This allows the plug member 250 to be shared between the surface side drainage portion 120 and the water level adjustment device 200, which has the advantage of reducing equipment costs.

[Modification]
Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above-mentioned embodiments. Various modifications and improvements can be made to the above-mentioned embodiments.

For example, in the above embodiment, the aquarium 20 is described as a cultivation bed capable of containing a culture solution, but this is not limited thereto, and the aquarium may be any container capable of storing liquid.

In the above embodiment, the water flow channels 145 are described as being formed at a predetermined interval around the circumference of the front flange portion 140, but this is not limited thereto, and the number and arrangement of the water flow channels can be changed as desired as long as the liquid can be drained without accumulating in the water tank 20.

In the above embodiment, the back drainage section 150 is described as having a back flange section 160, and a gasket 180 is provided between the back surface 34 of the floorboard 30 and the back flange section 160 of the back drainage section 150, but this is not limited thereto, and it is also possible to have a configuration without a gasket 180 as long as there is no water leakage from the connection between the drainage device 100 and the drainage opening 36. Examples of such a configuration include a configuration in which a waterproof material is provided on the surface of the back flange section 160, and a configuration in which a waterproof material is provided on the back surface 34 of the floorboard 30.

In the above embodiment, the gasket 180 is described as having a hole 182 with a diameter smaller than the drainage opening 36 of the floor plate 30, but this is not limited thereto, and the diameter d of the hole 182 of the gasket 180 may be equal to or larger than the diameter D of the drainage opening 36.

In the above-described embodiment, the water tank 20 is provided with a water level adjustment device 200 for adjusting the water level, and the water level adjustment device 200 has an outer peripheral surface that can be engaged with the opening 142 of the front flange portion 140. However, this is not limited to this, and a water level adjustment device that cannot be engaged with the opening 142 of the front flange portion 140 may be used, or a configuration that does not include the water level adjustment device 200 may be used.

In the above embodiment, the water level adjustment device 200 and the opening 142 of the front flange portion 140 are described as having corresponding inclined surfaces, but this is not limited thereto, and any of a variety of configurations can be adopted as long as there is no water leakage from the connection between the water level adjustment device 200 and the front flange portion 140.

In the above embodiment, the opening 142 of the front flange portion 140 is further provided with a plug member 250 capable of watertightly sealing off the water level adjustment device 200, and the water level adjustment device 200 is configured to be watertightly sealed off by the plug member 250. However, this is not limited to this, and the water level adjustment device 200 may use a plug member 250 that cannot seal off water, or may be configured without the plug member 250.

In the above embodiment, the drainage device 100 is described as having a washer 190 provided between the gasket 180 and the back-side drainage section 150, but this is not limited thereto, and any of a variety of configurations can be adopted as long as they are capable of preventing damage to the gasket 180 when the gasket 180 is clamped between the floor plate 30 of the aquarium 20 and the back-side drainage section 150.

In the above-described embodiment, the back side connecting portion 170 is formed as a bottomed tube as a whole, and is described as having a piping connection portion 175 extending from the longitudinal side of the back side connecting portion 170 in a direction perpendicular to the longitudinal direction of the back side connecting portion 170, but is not limited to this, and the back side connecting portion 170 can adopt any of a variety of configurations.

It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention.

10: Water storage device 20: Water tank (cultivation bed)
20A: Cultivation bed body 30: Floor board 32: Surface 34: Back surface 36: Drainage opening 40: Side board 100: Drainage device 110: Drainage path 120: Surface side drainage section 130: Surface side connection section 140: Surface side flange section 140a-140d: Flange piece 142: Opening 143: Inclined surface 145: Flow channel 150: Back side drainage section 160: Back side flange section 170: Back side connection section 175: Pipe connection section 180: Gasket 181a-181c: Linear convex section 182: Hole 190: Washer 200: Water level adjustment device 210: Small diameter section 220: Intermediate inclined section 230: Large diameter section 250: Plug member 252: Water-stopping surface 255: Handle

Claims (8)

A drainage device that can be attached to a drainage opening formed in a floorboard,
A surface-side drainage portion provided on the surface side of the floorboard;
A back-side drainage section is provided on the back side of the floorboard and can be attached to the front-side drainage section,
The front-side drainage portion and the back-side drainage portion are configured to form a drainage path that penetrates from the front side to the back side of the floorboard,
The front surface side drainage portion includes a cylindrical front surface side connecting portion extending into the drainage opening and to which the back surface side drainage portion is attached, and a front surface side flange portion extending radially outward from an end portion on the front surface side of the front surface side connecting portion,
the front surface side flange portion has an opening portion continuous with an inner peripheral surface of the front surface side connecting portion, and a water flow channel extending from an outer peripheral portion of the front surface side flange portion to the opening portion ,
The opening and the flow channel are open at the upper end.
A drainage device characterized by: The drainage device according to claim 1, characterized in that the water flow channels are formed in a plurality at predetermined intervals in the circumferential direction of the front flange portion. A drainage device according to claim 1 or 2,
A water storage device comprising: a floor plate; and a water tank having the drainage opening. The back surface side drainage portion includes a back surface side flange portion capable of clamping the floor plate between the back surface side drainage portion and the front surface side flange portion of the front surface side drainage portion,
The water storage device according to claim 3, further comprising a gasket provided between the rear surface of the floor plate and the rear surface flange of the rear surface drainage portion. The gasket has a hole at a position aligned with the drainage path,
5. The water storage device of claim 4, wherein the hole in the gasket has a smaller diameter than the drain opening in the floor plate. Further, a water level adjustment device for adjusting the water level of the water tank is provided.
The water storage device according to any one of claims 3 to 5, characterized in that the water level adjustment device has an outer peripheral surface that can be engaged with the opening of the front flange portion. The drainage device according to claim 6, characterized in that the outer peripheral surface of the water level adjustment device and the opening of the front flange portion have corresponding inclined surfaces. The front flange portion further includes a plug member capable of waterproofing the opening portion,
The drainage device according to claim 6 or 7, characterized in that the water level adjustment device is configured to be able to stop water flow by the plug member.

Images