JP2011125307A - Liquid circulation device and hydroponic device for home using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid circulation device circulating liquid in a container thoroughly in the container, and to provide a hydroponic device for home using the liquid circulation device. <P>SOLUTION: The liquid circulation device includes a container 2 for storing liquid 6, a circulation path 3 having an inlet 3a and an outlet opening 3b opened in the liquid and circulating the liquid 6, an air supply pipe 4 connected with the circulation path 3 through an air supply opening 4a, and sucking the liquid 6 from the inlet opening 3a to circulate to one direction and send out from the outlet opening 3b, and an air pump 5 connected to the air supply pipe 4. One or both the inlet opening 3a and the outlet opening 3b of the circulation path 3 open to a direction along the inner wall surface of the container 2 near the inner wall surface, and the air supply port 4a is installed on a part rising in the circulation direction of the liquid 6 in the circulation path 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid circulation device that can efficiently circulate a liquid (liquid fertilizer) in a container and a household hydroponic cultivation device using the same.

An organic hydroponic cultivation apparatus is described in Patent Document 1. In Patent Document 1, an air lift type pump is attached to a cultivation tank, an air mat in the nutrient solution tank and an air pump attached to the pump are connected, and bubbles are blown into the nutrient solution and the nutrient solution is pumped at the same time. It is.
It is desired that the liquid fertilizer, which is a nutrient solution supplied to the cultivation tank, be distributed throughout the container. However, in the conventional hydroponic cultivation apparatus including Patent Document 1, circulation is performed by supplying and discharging liquid fertilizer in the so-called vertical direction using an air lifter. Since the cultivation container for hydroponics generally has a large width and / or depth (or both), liquid fertilizer is supplied from the upper side of any position of the cultivation container and drained from the lower side of any position of the cultivation container. Even if prepared, liquid fertilizer does not circulate evenly in the cultivation container.

Japanese Patent No. 4324648

  This invention considers the said prior art, Comprising: Provided the liquid circulation apparatus which can circulate the liquid in a container uniformly in the said container, and a household hydroponic cultivation apparatus using the same Objective.

  In order to achieve the above object, in the invention of claim 1, a container for containing a liquid, an inlet and an outlet opened in the liquid in the container, and a circulation path for circulating the liquid, An air supply connected to the circulation path via an air supply port, for supplying air to the circulation path, sucking the liquid from the inlet into the circulation path, allowing the liquid to flow in one direction, and delivering it from the outlet. A pipe and an air pump connected to the air supply pipe, and one or both of the inlet and the outlet of the circulation path open in the direction along the inner wall surface in the vicinity of the inner wall surface of the container, The air supply port is provided in a portion rising in the circulation direction of the liquid in the circulation path.

According to a second aspect of the present invention, in the first aspect of the present invention, the circulation path is a circulation pipe, and the device further includes holding means for holding the circulation pipe in the container. .
According to a third aspect of the present invention, in the second aspect of the present invention, the holding means is a holding member that is fixed to the bottom surface or the inner wall surface of the container and is disposed in contact with the circulation pipe that extends through the liquid from above. It is characterized by being.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the holding means is a pipe member formed of a material having a specific gravity greater than that of the liquid, and the pipe member forms all or part of the circulation pipe. It is characterized by having.
According to a fifth aspect of the invention, in the second aspect of the invention, the holding means includes a holding hole formed in the bottom or side wall of the container and through which the circulation pipe is inserted.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the circulation path includes a flow path extending in the bottom or side wall of the container.
According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the inlet and the outlet are provided so as to open to a bottom surface or an inner wall surface of the container.
Moreover, in invention of Claim 8, the liquid circulation apparatus in any one of Claims 1-7, the cover material which covers the liquid level of the said liquid in the said container, and many penetration formed in this cover material Provided is a household hydroponic cultivation apparatus comprising a hole.

  According to the first aspect of the present invention, the liquid passing through the circulation path flows in from the inlet, is circulated in one direction by the air supplied from the air supply pipe by the air pump, and flows out from the outlet. The liquid in the container can be circulated evenly. Further, the air supply port is provided at a portion rising in the circulation direction of the liquid in the circulation path, and can be formed so as to reliably guide the circulation direction in the circulation path from the inlet to the outlet. Therefore, the liquid flowing out from the outlet heads to the inlet while circulating in the container. For this reason, the liquid in a container circulates uniformly.

According to the invention of claim 2, since the holding means for holding the circulation pipe in the container is further provided, the circulation pipe does not move in the container, and the liquid in the container using the circulation pipe is universally used. Uniform circulation can be realized.
According to the invention of claim 3, since the holding means is fixed to the inner surface of the container and arranged in contact with the upper side of the circulation pipe, it is possible to reliably prevent the circulation pipe from rising in the liquid surface direction due to buoyancy. Further, it is possible to prevent the liquid from flowing in an unexpected direction due to the movement of the circulation pipe.

According to the invention of claim 4, since the whole or part of the circulation pipe is formed as the holding means using the pipe member having a specific gravity larger than that of the liquid, the circulation pipe does not move in the container. Therefore, it is possible to prevent the liquid from flowing in an unexpected direction due to the movement of the circulation pipe.
According to the fifth aspect of the present invention, the holding hole is formed on the bottom or side wall of the container to form the holding means in which the circulation pipe can be arranged. Therefore, the circulation pipe is arranged here to securely fix the circulation pipe. Can be held. Therefore, it is possible to prevent the liquid from flowing in an unexpected direction due to the movement of the circulation pipe.

  According to invention of Claim 6, since the flow path extended in the bottom or side wall of a container is used as a circulation path, the bottom or side wall itself plays the role which circulates a liquid. Therefore, for example, liquid passing through a tubular path formed by processing the side wall flows in from the inlet, flows in one direction with air supplied from the air supply pipe by the air pump, and flows out from the outlet. The liquid can be circulated evenly.

According to the seventh aspect of the present invention, since the inlet and the outlet are provided to be opened on the bottom surface or the inner wall surface of the container, the one that functions as a circulation path capable of circulating the liquid only by processing the container is formed. . For this reason, the number of parts is reduced, and a liquid circulation device having a good appearance can be obtained.
According to invention of Claim 8, by using the cover material in which many through-holes were formed, a seedling can be planted in this through-hole and hydroponics can be performed. At this time, the liquid fertilizer serving as the seedling fertilizer circulates efficiently, so that the growth of the seedling can be promoted. Moreover, since hydroponics can be performed only with a container, an air pump, a circulation path, and a cover material, it can be easily used as a home hydroponics kit.

It is a top view of the liquid circulation apparatus which concerns on this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a schematic sectional drawing of the household hydroponic cultivation apparatus using the liquid circulation apparatus which concerns on this invention. It is a schematic sectional drawing which shows another example with respect to the example of FIGS. It is a top view of another liquid circulation device concerning the present invention. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is a top view of another liquid circulation device concerning the present invention. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is a top view of another liquid circulation device concerning the present invention. It is GG sectional drawing of FIG. It is HH sectional drawing of FIG. It is a top view of another liquid circulation device concerning the present invention. It is II sectional drawing of FIG. It is JJ sectional drawing of FIG. It is a top view of another liquid circulation device concerning the present invention. It is KK sectional drawing of FIG. It is LL sectional drawing of FIG. It is a top view of another liquid circulation device concerning the present invention. It is MM sectional drawing of FIG. It is NN sectional drawing of FIG.

1 is a plan view of a liquid circulation apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.
As shown in the figure, the liquid circulation device 1 according to the present invention includes a container 2, a circulation pipe 3, an air supply pipe 4, and an air pump 5. The air pump 5 is described only in FIG. 1 and is omitted in the subsequent drawings. The container 2 is formed using, for example, polystyrene foam. A liquid 6 is accommodated in the container 2. That is, the container 2 is filled to some extent with the liquid 6. A circulation pipe 3 serving as a circulation path of the liquid 6 is disposed along the wall surface of the container 2.

  Referring to FIG. 1, the circulation pipe 3 is disposed along the inner wall surface of the container 2. As will be described later, the circulation pipe 3 circulates the liquid in the container 2 evenly. An air supply pipe 4 is connected to a portion of the circulation pipe 3 rising from the inlet 3a toward the outlet 3b via an air supply port 4a (see FIG. 3). The air supply pipe 4 is connected to an air pump 5, and air is supplied from the air pump 5. The air supplied from the air pump 5 flows into the circulation pipe 3 through the air supply pipe 4. At this time, since the air supply port 4a is connected to the position where the circulation pipe 3 rises toward the outlet 3b, the air flows in the direction of the outlet 3b by natural rise. The flow to the outlet 3b due to the natural rise may be adjusted by adjusting the connection position and connection direction of the air supply pipe 4, or by considering the length and diameter of the circulation pipe 3 or the height of the circulation pipe 3 as appropriate. By doing so, it can be optimized. In addition, in order to prevent the back flow of a liquid, it is preferable that the air supply pipe 4 passes once higher than a water surface. Moreover, since air is supplied, management of dissolved oxygen in the liquid can be performed appropriately.

  As described above, the circulation pipe 3 has the inlet 3a and the outlet 3b at its ends. The inlet 3 a and the outlet 3 b are opened in the liquid 6 in the container 2. The inlet 3 a is disposed on the lower side along the wall surface of the container 2. On the other hand, the outlet 3 b is disposed on the upper side along the wall surface of the container 2. The liquid in the container 2 flows in from the inlet 3a, flows out of the outlet 3b through the circulation pipe 3. The inlet 3a and the outlet 3b face each other along the inner wall surface of the container. Accordingly, the liquid 6 flowing out from the outlet 3b efficiently flows toward the inlet 3a along the inner wall surface. At this time, not all of the liquid 6 flowing out from the outlet 3b flows into the inlet 3a, but rather circulates along the inner wall surface of the container 2 to some extent and then flows into the inlet 3a. That is, the liquid 6 flowing out from the outlet 3b circulates uniformly in the container 2 along the inner wall surface of the container 2, and eventually flows into the inlet 3a. At this time, since the inlet 3a is on the lower side of the container 2 and the outlet 3b is on the upper side of the container 2, the liquid 6 flowing out from the outlet 3b is circulated in the container 2 toward the inlet 3a on the lower side of the container 2 The liquid 6 circulates evenly in the vertical direction.

  In other words, the air supply port 4a is provided at a portion rising in the circulation direction of the liquid 6 in the circulation pipe 3 serving as a circulation path, the outlet 3b is located above the air supply port 4a, and the air supply port 4a The circulation pipe 3 from the outlet to the outlet rises in the flow direction of the liquid 6 or is formed horizontally. For this reason, it can form so that the distribution direction in the circulation pipe 3 may be reliably guide | induced from the inlet 3a to the outlet 3b. Further, since the circulation pipe 3 has a rising portion, and the outlet 3b is above the air supply port 4a connected to the rising portion, the outlet 3b is above the inlet 3a, more preferably the inlet 3a is a container. 2, the outlet 3 b is on the upper side of the container 2. Accordingly, the liquid 6 flowing out from the outlet 3b on the upper side of the container goes to the inlet 3a on the lower side of the container while circulating in the container 2. For this reason, the liquid circulates evenly in the vertical direction in the container 2.

If the side wall of the container 2 has a polygonal shape in cross section, for example, a rectangular shape as shown in FIG. 1, and the inlet 3a and the outlet 3b are arranged so as to face each other with one corner 2a interposed therebetween, the efficiency is improved. Good liquid circulation can be realized. The liquid 6 flowing out from the outlet 3b once hits the corner 2a, thereby realizing efficient circulation.
The circulation pipe 3 is held in the container 2 by using holding means. By reliably holding the circulation pipe 3 in this way, the circulation pipe 3 does not move in the container 2, and universal circulation of the liquid 6 in the container 2 using the circulation pipe 3 is realized universally. can do. In the figure, an example in which the holding member 7 is used as the holding means is shown. The holding member 7 has, for example, a substantially rectangular parallelepiped shape, and one side surface thereof is fixed to the inner wall surface of the container 2 by adhesion or the like. The lower surface of the holding member 7 is in contact with the upper side of the circulation pipe 3, and the circulation pipe 3 is reliably prevented from rising in the liquid surface direction by buoyancy. Therefore, it is possible to prevent the liquid 6 from flowing in an unexpected direction due to the movement of the circulation pipe 3. The holding member 7 is made of, for example, polystyrene foam. The holding member 7 may be fixed to the bottom surface.

  On the other hand, the holding member 8 is used as another holding means. The holding member 8 is fixed to the inner wall surface of the container 2 by adhesion or the like with the circulation pipe 3 being sandwiched. In the figure, the holding member 8 is used at a location where the circulation pipe 3 extends in an oblique direction. Even the one having the mechanism for holding the circulation pipe 3 itself can reliably prevent the circulation pipe 3 from moving. The holding member 8 may be formed of the same material as that of the holding member 7, that is, polystyrene foam.

FIG. 4 is a schematic sectional view of a household hydroponic cultivation apparatus using the liquid circulation apparatus according to the present invention.
As illustrated, the household hydroponics apparatus 9 according to the present invention is provided with a lid 10 in addition to the liquid circulation apparatus 1 according to the present invention. The lid member 10 is placed on the liquid surface of the liquid 6 and covers the liquid surface. A large number of through holes 11 are formed in the lid member 10. When hydroponics is performed using such a household hydroponics device 9, first, liquid fertilizer as the liquid 6 is filled in the container 2. And a seedling is planted in the through-hole 11 of the lid | cover material 10, and this is mounted in a liquid level. Thereafter, the air pump is operated to circulate the liquid fertilizer. Since the liquid circulation device 1 according to the present invention is used, the liquid fertilizer serving as a seedling fertilizer efficiently circulates in the container 2 and promotes the growth of the seedling. Moreover, if this hydroponics apparatus 9 is used, hydroponics can be performed only by the container 2, the air pump 5 (refer FIG. 1), the circulation pipe 3, and the cover material 10, Therefore As a hydroponics kit for home use It can be used easily. In addition, if the lid | cover material 10 is provided in the liquid circulation apparatus of the example demonstrated below, all can be applied as the household hydroponic cultivation apparatus 9. FIG.

FIG. 5 is a schematic cross-sectional view showing another example of the example of FIGS.
As shown in the figure, the circulation pipe 3 is bent halfway and stands upright. In the example of FIGS. 1 to 3, from the inlet 3 a located on the lower side of the container 2 to the outlet 3 b located on the upper side of the container 2, the circulation pipe 3 rises obliquely upward along a side surface. . On the other hand, in the example shown in FIG. 5, there is no such slanting inclined portion, and it has a rising portion 12 rising vertically. Such a rising portion 12 is also an ascending portion from the inlet 3a to the outlet 3b. By connecting the air supply port 4a here, the circulation of the liquid 6 in the container 2 using the circulation pipe 3 can be realized. it can. For the circulation of the liquid 6 in the container 2, the route from the air supply port 4a to the outlet 3b and the connection position of the air supply port 4a to the circulation pipe are important. By providing the air supply port 4a at the rising portion of the circulation pipe 3, the circulation pipe 3 in other portions may have any shape. For example, not only the horizontal portion as shown in the figure but also the irregularities may be repeated like a wave shape. If the one-way flow in the circulation pipe 3 can be formed by the air supplied from the air pump 5, the shape, diameter, etc. of the circulation pipe 3 can be changed as appropriate.

6 is a plan view of another liquid circulation apparatus according to the present invention, FIG. 7 is a sectional view taken along the line CC in FIG. 6, and FIG. 8 is a sectional view taken along the line DD in FIG.
As illustrated, the difference from the example of FIGS. 1 to 3 is the structure of the holding member 13 and the holding member 14. That is, the holding member 13 that holds the horizontal portion of the circulation pipe 3 is formed of, for example, foamed polystyrene, and is fitted into the container 2 and fixed. More specifically, a vertical groove 15 is formed on the inner wall surface of the container 2, and the holding member 13 is slid and fitted into the vertical groove 15 to be fixed. On the other hand, the holding member 14 for holding the portion of the circulation pipe 3 that rises in the oblique direction holds the pipe 3 with the pipe 3 interposed therebetween as in the examples of FIGS. However, the difference is that the lower side is formed integrally with the container, and the upper side is a separate member 14a made of, for example, polystyrene foam. Similarly to the holding member 13, the member 14 a is slid and fitted into the vertical groove 15 formed in the container 2 and fixed. Even if the holding member 13 and the member 14a and the container 2 are made of polystyrene foam, even if they are slid through the longitudinal groove 15, they are fixed by the elasticity and frictional force of the material. In this way, the circulation pipe 3 can be reliably prevented from rising in the liquid surface direction due to buoyancy, and the liquid 6 can be prevented from flowing in an unexpected direction due to the movement of the circulation pipe 3. Other configurations, operations, and effects are the same as those in the example of FIGS.

9 is a plan view of still another liquid circulation device according to the present invention, FIG. 10 is a cross-sectional view taken along line EE in FIG. 9, and FIG. 11 is a cross-sectional view taken along line FF in FIG.
As shown in the figure, the difference from the example of FIGS. 1 to 3 is the holding means for the circulation pipe 3. The holding member 16 is formed of a pipe member made of a material having a specific gravity greater than that of the liquid 6, for example, a heavy object having corrosion resistance such as stainless steel or ceramics. By placing this in the vicinity of the inlet 3a and outlet 3b of the circulation pipe 3 from the outside, the position in the container can be fixed. That is, the pipe member made of the holding member 16 forms a part of the circulation pipe 3. Further, in the middle part of the circulation pipe 3, the holding member 17 is used for holding. The holding member 17 includes a rising portion 17a that rises from the bottom surface of the container 2, and a holder 17b that is attached to the rising portion 17a. The holder 17b is, for example, a circular ring, and the circulation pipe 3 is held by passing the circulation pipe 3 therethrough. In this way, the circulation pipe 3 can be reliably prevented from rising in the liquid surface direction due to buoyancy, and the liquid 6 can be prevented from flowing in an unexpected direction due to the movement of the circulation pipe 3. Other configurations, operations, and effects are the same as those in the example of FIGS.

12 is a plan view of still another liquid circulation apparatus according to the present invention, FIG. 13 is a cross-sectional view taken along line EE in FIG. 12, and FIG. 14 is a cross-sectional view taken along line FF in FIG.
As shown in the figure, the difference from the example of FIGS. 1 to 3 is the holding means for the circulation pipe 3. The circulation pipe 3 is formed of a pipe member made of a material having a specific gravity greater than that of the liquid 6, for example, a heavy object having corrosion resistance such as stainless steel or ceramics. That is, the entire circulation pipe is formed by such a heavy pipe member. Further, when the intermediate portion of the circulation pipe 3 is inclined, the portion is held using the holding member 18. The holding member 18 is formed integrally with the container 2 and simply places the circulation pipe 3 to hold the height thereof. In addition, when the holding member 18 is provided as a separate body, a material that does not float against the liquid and has corrosion resistance is used. In this way, the circulation pipe 3 can be reliably prevented from rising in the liquid surface direction due to buoyancy, and the liquid 6 can be prevented from flowing in an unexpected direction due to the movement of the circulation pipe 3. Other configurations, operations, and effects are the same as those in the example of FIGS.

15 is a plan view of still another liquid circulation apparatus according to the present invention, FIG. 16 is a cross-sectional view taken along the line II in FIG. 15, and FIG. 17 is a cross-sectional view taken along the line JJ in FIG.
As shown in the figure, the difference from the example of FIGS. 1 to 3 is the holding means for the circulation pipe 3. That is, the circulation pipe 3 is disposed in a holding hole 19 formed by processing the container 2. The holding hole 19 is formed in the side wall of the container 2 and has a diameter that can be covered with the circulation pipe 3. The circulation pipe 3 in the vicinity of the inlet 3 a and the outlet 3 b protrudes from the side wall of the container 2 and faces the container 2. Thus, by holding substantially the entire circulation pipe 3 with the holding hole 19, the circulation pipe 3 is reliably prevented from rising in the liquid surface direction due to buoyancy, and the liquid 6 caused by the movement of the circulation pipe 3 can be prevented. Distribution in an unexpected direction can be prevented. The holding hole 19 may be provided at the bottom of the container 2. Other configurations, operations, and effects are the same as those in the example of FIGS.

18 is a plan view of still another liquid circulating apparatus according to the present invention, FIG. 19 is a sectional view taken along the line KK in FIG. 18, and FIG. 20 is a sectional view taken along the line LL in FIG.
As shown in the drawing, the difference from the example of FIGS. 1 to 3 is that the circulation pipe 3 is formed by a tubular path 20 formed integrally with the side wall of the container 2. That is, the inside of the inner wall of the container 2 is processed to form a tubular path 20 that is a tubular hole. As described above, since the tubular path 20 formed integrally with the side wall of the container 2 is used, the side wall itself serves as a circulation path for circulating the liquid 6. And the inlet 20a and the outlet 20b of this tubular channel | path 20 are opened and provided in the bottom face or inner wall surface (in the figure inner wall surface) of the container 2. As shown in FIG. Thereby, what plays the role of the circulation path which can circulate a liquid only by processing of a container is formed. For this reason, the number of parts is reduced, and a liquid circulation device having a good appearance can be obtained. Further, the positions of the inlet 20a and the outlet 20b are arranged on the lower side and the upper side of the container as in the case of the inlet 3a and the outlet 3b described above, so that the liquid flowing out from the outlet 20b circulates in the container 2 while lowering the lower side. The liquid circulates evenly in the vertical direction in the container 2 toward the inlet 20a. Further, since the container 2 itself serves as the circulation pipe 3, it is not necessary to provide a holding means for that purpose. The tubular path 20 may be provided at the bottom of the container 2. Other configurations, operations, and effects are the same as those in the example of FIGS.

21 is a plan view of still another liquid circulation device according to the present invention, FIG. 22 is a cross-sectional view taken along the line II of FIG. 21, and FIG. 23 is a cross-sectional view taken along the line JJ of FIG.
As shown in the figure, the difference from the example of FIGS. 1 to 3 is the holding means for the circulation pipe 3. That is, the circulation pipe 3 passes through the side wall of the container 2 and once exits the container 2. Then, it extends along the outer wall of the container 2, passes through the container 2 again, and returns into the container 2. The positions of the inlet 3a and the outlet 3b are the same as in the examples of FIGS. Thus, the container 2 may be penetrated, and the circulation pipe 3 may be held by this penetration portion. In this way, the circulation pipe 3 can be reliably prevented from rising in the liquid surface direction due to buoyancy, and the liquid 6 can be prevented from flowing in an unexpected direction due to the movement of the circulation pipe 3. Other configurations, operations, and effects are the same as those in the example of FIGS.

DESCRIPTION OF SYMBOLS 1 Liquid circulation apparatus 2 Container 2a Corner | angular part 3 Circulation pipe 3a Inlet 3b Outlet 4 Air supply pipe 4a Air supply port 5 Air pump 6 Liquid 7 Holding member 8 Holding member 9 Domestic hydroponics apparatus 10 Cover material 11 Through-hole 12 Standing part 13 Holding member 14 Holding member 15 Vertical groove 16 Holding member 17 Holding member 17a Standing part 17b Holding tool 18 Holding member 19 Holding hole 20 Tubular path

Claims (8)

A container for containing the liquid;
A circulation path having an inlet and an outlet opened in the liquid in the container, for circulating the liquid;
An air supply connected to the circulation path via an air supply port, for supplying air to the circulation path, sucking the liquid from the inlet into the circulation path, allowing the liquid to flow in one direction, and delivering it from the outlet. Tube,
An air pump connected to the air supply pipe,
One or both of the inlet and the outlet of the circulation path open in the direction along the inner wall surface in the vicinity of the inner wall surface of the container,
The liquid supply apparatus according to claim 1, wherein the air supply port is provided at a portion of the circulation path that is rising in the liquid flow direction. The circulation path is a circulation pipe;
The liquid circulation apparatus according to claim 1, wherein the apparatus further comprises holding means for holding the circulation pipe in the container.   3. The liquid circulation according to claim 2, wherein the holding means is a holding member that is fixed to a bottom surface or an inner wall surface of the container and is arranged in contact with the circulation pipe extending through the liquid from above. apparatus.   The liquid according to claim 2, wherein the holding means is a pipe member made of a material having a specific gravity greater than that of the liquid, and the pipe member forms all or part of the circulation pipe. Circulation device.   3. The liquid circulating apparatus according to claim 2, wherein the holding means includes a holding hole formed in the bottom or side wall of the container and through which the circulation pipe is inserted.   The liquid circulation device according to claim 1, wherein the circulation path includes a flow path extending in a bottom or a side wall of the container.   The liquid circulation apparatus according to claim 6, wherein the inlet and the outlet are provided to be opened on a bottom surface or an inner wall surface of the container. A liquid circulation device according to any one of claims 1 to 7,
A lid covering the liquid level of the liquid in the container;
A household hydroponic cultivation apparatus comprising a large number of through holes formed in the lid.

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