Filtration device for aquariums for aquatic life

Abstract

To improve a whole filtration ability by preventing deviation of a filtering ability and making it uniform, and reduce the running cost by extending a maintenance period.SOLUTION: A filtration device for aquatic water tanks comprises a filtration unit 2 formed of a porous sponge Sd with water permeability, a soil case 3 for storing soils G and having water permeability, a filter support 4 including a filter plate 4u with multiple water holes H (Hn, Hm, Hd, etc.) whose one faces 4us face the filtration unit 2 and / or the soil case 3, and an aeration unit 5 including an inflow part 5if facing a prescribed position on the other surface 4ur side of the filter plate 4u. Hole diameters Dn, Dm and Dd of the multiple water holes H (Hn, Hm, Hd, etc.) are stepwisely increased in a direction Fd away from the position on the inflow part 5if side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a filtration device for an aquarium for aquatic organisms, which is installed inside an aquarium containing breeding water and aquatic organisms to perform a filtering process on the breeding water. [Background technology]

[0002] Traditionally, aquariums for raising and appreciating aquatic organisms such as goldfish have been widely used. Usually, gravel or soil is spread on the bottom of this type of aquarium to function as a breeding ground for bacteria that improve the water quality and to prevent pollutants and garbage from floating in the water.

[0003] On the other hand, over time, the water in the aquarium becomes contaminated with pollutants such as aquatic organism excrement, dead leaves from aquatic plants, and various other debris, which has a detrimental effect on the survival of the aquatic organisms. Therefore, various filtration devices (filters) have been proposed to remove pollutants from the water, and the present applicant has already proposed an aquarium for aquatic organisms equipped with this type of filter in Patent Document 1.

[0004] The aquarium for aquatic organisms described in Patent Document 1 is intended to provide an aquarium for aquatic organisms that facilitates the work of restoring and improving the breeding environment for the aquatic organisms, including restoring the breeding water. Specifically, the aquarium comprises a main container, a case for water-permeable soil that can be removably placed inside the main container, an inner frame made of sponge that can hold the case, a filter for filtering water, and a water circulation device that can be connected to the filter, and the inner frame is configured so as to have a window portion that penetrates from top to bottom into which the case can be fitted. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3175697 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the tank for aquatic organisms described in the above-mentioned Patent Document 1 has the following problems that need to be further improved.

[0007] That is, the water in the aquarium passes through the soil case and the sponge inner frame, then through the filter, and is then sucked in by the suction port of the water circulation device located near the end of the filter. For this reason, the water that passes through the soil case and the sponge inner frame, i.e., the filtered water, tends to be concentrated on the suction port side of the water circulation device.

[0008] As a result, depending on the position of the soil case and the sponge inner frame, the filtering ability was biased, and there was a problem of uneven filtering performance. This led to a decrease in the overall filtering ability, and the maintenance period required for cleaning and replacement was shortened, resulting in an increase in running costs.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a filtration device for an aquarium for aquatic organisms that solves the problems existing in the background art. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the present invention provides a filtration device 1 for an aquarium for aquatic organisms, which is installed inside an aquarium A containing breeding water and aquatic organisms and performs a filtration process on the breeding water W, and which comprises a filtration unit 2 formed from a porous sponge Sd having water permeability, a soil case 3 having water permeability for containing soil G, a filter support 4 having a filter plate portion 4u with a number of water passage holes H (Hn, Hm, Hd) ... with one side 4us facing the filtration unit 2 and / or the soil case 3, an auxiliary filtration unit 11 formed from a porous sponge Sr having water permeability installed on the inner surface of the rear portion Ar of the aquarium A, and an aeration unit 5 having an inlet portion 5if facing a predetermined position on the other side 4ur of the filter plate portion 4u and an auxiliary inlet portion 5ir facing the inside of the auxiliary filtration unit 11, and the hole diameters Dn, Dm, Dd of the number of water passage holes H (Hn, Hm, Hd) ... are formed to be gradually larger in a direction Fd away from the position on the inlet portion 5if side.

[0011] In this case, according to a preferred embodiment of the invention, the soil G can contain at least one or more of gravel, soil, and filter media. The filtration unit 2, the soil case 3, the filter support 4, and the aeration unit 5 can form a circulation path C in which the breeding water W in the aquarium A flows through the filtration unit 2 and / or the soil case 3, the filter support 4, and the inlet part 5if of the aeration unit 5, and flows out from the outlet part 5ef of the aeration unit 5. Meanwhile, the auxiliary inlet part 5ir can be provided with cylindrical inlets 5irp, 5irq having a number of water passage holes Hr... formed on the circumferential surface. Effect of the Invention

[0012] The filtration device 1 for an aquarium for aquatic organisms according to the present invention having such a configuration provides the following remarkable effects.

[0013] (1) It is possible to prevent the filtering capacity of the filtration unit 2 and / or the soil case 3 of the breeding water W from being unevenly distributed, and to distribute and evenly distribute the filtering performance, thereby improving the overall filtering capacity and lengthening the maintenance period for cleaning, replacement, etc., thereby reducing running costs.

[0014] (2) The inner surface of the rear part Ar of the aquarium A is provided with the auxiliary filtration unit 11 made of a porous sponge Sr having water permeability, and the aeration unit 5 with the auxiliary inlet part 5ir facing the inside of the auxiliary filtration unit 11, so that the filtration area can be enlarged. This not only improves the overall filtration performance (capacity), but also enhances the aesthetic effect of the aquarium A, for example, by coloring the rear area of ​​the aquarium A in black.

[0015] (3) In a preferred embodiment, if the soil G contains at least one or more of gravel, soil, and filter media, various types of soil G containing gravel, soil, and filter media can be selected and used as desired, and by storing the soil in the soil case 3, it can be easily replaced with new soil G or changed to other soil G.

[0016] (4) In a preferred embodiment, when the filtration unit 2, soil case 3, filter support 4, and aeration unit 5 are provided, the culture water W in the aquarium A flows through the filtration unit 2 and / or soil case 3, filter support 4, and inlet 5i of the aeration unit 5 to form a circulation path C that flows out from the outlet 5ef of the aeration unit 5. This allows the pollutants in the culture water W to be filtered by the planar dispersion achieved by the combination of the filtration unit 2 and / or soil case 3, and filter support 4, thereby enabling efficient and effective filtering. Moreover, this contributes to reducing initial costs, as a commercially available aeration unit 5 can be used as is.

[0017] (5) In a preferred embodiment, by providing the auxiliary inlet section 5ir with a cylindrical inlet section 5r having a number of water passage holes Hr... formed on its circumferential surface, the inlet points for the rearing water W can be widely dispersed, thereby enabling efficient and more effective filtering. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional front view showing an internal structure of an aquarium for aquatic organisms equipped with a filtration device according to a preferred embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional plan view showing the internal structure of an aquarium for aquatic organisms equipped with the filtration device; [Diagram 3] An explanatory diagram of the operation of the filtration device, including a detailed structure thereof; [Figure 4] FIG. 2 is a plan view of a filter support provided in the filtration device; [Diagram 5] FIG. 2 is a cross-sectional side view of an auxiliary filtration unit and an auxiliary inlet portion of the filtration device; [Figure 6] FIG. 2 is a cross-sectional front view of an auxiliary filtration unit and an auxiliary inlet portion of the filtration device; [Figure 7] An exploded view of the main components of the filtration device, showing a cross-sectional front view; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0020] First, the configuration and assembly method of a filtration device 1 according to this embodiment will be specifically described with reference to FIGS.

[0021] 1 and 2, A indicates an entire aquarium for aquatic organisms equipped with a filtration device 1. As shown in Fig. 1, the filtration device 1 includes a main filtration unit Uf installed on the bottom part Ad side of the aquarium A and an auxiliary filtration unit Ur installed on the back part Ar side.

[0022] The main filtering section Uf includes a filtering unit 2, a soil case 3, a filter support 4, and an aeration unit 5 in its main portion.

[0023] As shown in Fig. 2 and Fig. 7, the filtration unit 2 is composed of an inner frame filtration part 2i and an outer frame filtration part 2o. The inner frame filtration part 2i and the outer frame filtration part 2o are each integrally formed as a whole from a porous sponge Sd, and it is preferable that the color is black or a color similar to black. This porous sponge Sd is made of polyvinyl alcohol (PVA) and is made of a continuous porous body (three-dimensional mesh structure) with open cells. In particular, it has excellent water permeability (hydrophilicity, water absorption), with a porosity of about 90% and an average pore size of about 150 μm.

[0024] The outer frame filtration section 2o is formed in a rectangular frame shape along the inner surface (inner wall surface) of the tank A. An installation space for an auxiliary filtration unit 11, which will be described later, is provided between the rear end surface of the outer frame filtration section 2o and the inner surface of the rear part Ar of the tank A. The inner frame filtration section 2i is formed in a rectangular frame shape along the inner edge of the outer frame filtration section 2o, and the shape of the inner edge of the inner frame filtration section 2i provides an arrangement space for a soil case 3, which will be described later. In the embodiment, the outer frame filtration section 2o and the inner frame filtration section 2i are formed separately, but when the outer frame filtration section 2o and the inner frame filtration section 2i are formed from the same material, they may be integrally molded, or when the outer frame filtration section 2o and the inner frame filtration section 2i are formed separately, they may be formed from different materials or materials with different properties.

[0025] As shown in Fig. 3, the soil case 3 is configured as a water-permeable container for storing soil G. In this case, the soil G can contain at least one or more of gravel, soil, and filter media. This allows various types of soil G including gravel, soil, and filter media to be selected and used as desired, and by storing the soil in the soil case 3, it is easy to replace the soil G with new soil G or change to another soil G.

[0026] The overall shape of the soil case 3 is a rectangular parallelepiped with an open top. The soil case 3 in the example is integrally formed from a synthetic resin material, and a large number of small holes 3h... are formed on the entire sides and bottom as shown in FIG. 3. The size of the small holes 3h... need only be selected to be large enough to hold the soil G inside the soil case 3, and is not limited to a specific size. The soil case 3 may also be made of a wire mesh or the like that has water permeability. Note that 3p... indicate four legs that protrude downward from the bottom of the soil case 3.

[0027] As shown in Figs. 1-2, 4 and 7, the filter support 4 is made of a synthetic resin material and formed into a flat plate shape with a hollow portion 21m inside. Therefore, the illustrated filter support 4 has a filter plate portion 4u and a lower plate portion 4d that are vertically separated, and a hollow portion 21m is provided between the filter plate portion 4u and the lower plate portion 4d. As a result, the upper surface of the filter plate portion 4u becomes one surface 4us, and the lower surface (inner surface) becomes the other surface 4ur. The lower surface of the installed inner frame filtering portion 2i is in close contact with the one surface 4us of the filter plate portion 4u, and faces the bottom surface of the soil case 3 when the soil case 3 is installed.

[0028] The plane of the filter support 4 is formed as shown in FIG. 4. That is, a number of water passage holes H (Hn, Hm, Hd) are formed on one surface 4us of the filter plate portion 4u. In this case, in order to provide an inlet portion 5if of the aeration unit 5 described later, shown by a virtual line, near the corner Pa on the upper left side of the filter plate portion 4u in FIG. 4, the corner Pa is divided into three areas Zn, Zm, Zd along a diagonal line, and the hole diameters Dn, Dm, Dd of the water passage holes Hn, Hm, Hd formed in each area Zn, Zm, Zd are made different. Specifically, the hole diameters Dn, Dm, Dd are gradually increased in the direction Fd away from the position on the inlet portion 5if side. In the illustrated example, the hole diameters Dn, Dm, Dd are selected to be 2 [mm], 3 [mm], and 4 [mm], respectively. In FIG. 4, dashed lines Lnm and Lmd indicate the boundaries between the areas Zn, Zm and Zd.

[0029] The illustrated form of the filter plate portion 4u is one example, and the positions and number of the dashed lines Lnm, Lmd that divide the area, and the size and number of the hole diameters Dn, Dm, Dd can be selected arbitrarily, except for the following condition, that is, the condition that the hole diameters Dn, Dm, Dd are gradually enlarged in the direction Fd away from the position on the inlet portion 5if side. Note that "stepwise" is a concept that includes the case where the hole diameters are gradually (gradationally) enlarged. Also, although an example in which each of the water passage holes Hn..., Hm..., Hd... is formed into a circle is shown, various shapes such as a triangle or a square can be implemented. Therefore, "hole diameter" has the same meaning as "area size".

[0030] As shown in Fig. 1, the aeration unit 5 includes an air pump 25, an air hose 26, and an air lift pipe 27, and the lower end opening of the air lift pipe 27 serves as the inlet 5if. Since the aeration unit 5 only needs to have the function of performing aeration, a commercially available product can be used. As shown in Fig. 3, the inlet 5if faces the other surface 4ur of the filter plate part 4u through a through hole 4ut provided in the filter plate part 4u. The tip side of the air hose 26 faces the inside of the air lift pipe 27, and the air outlet 26s at the tip is located near the lower end of the air lift pipe 27.

[0031] On the other hand, the auxiliary filtration section Ur includes, in its main portion, an auxiliary filtration unit 11 and an auxiliary inflow section 5ir. As shown in Figures 1-2 and 6-7, the auxiliary filtration unit 11 is formed of a porous sponge Sr having water permeability, and can be placed so as to overlap the inner surface of the rear section Ar of the water tank A. In this case, as shown in Figures 1 and 2, it is preferable to hold the left and right sides of the auxiliary filtration unit 11 by, for example, fixing hook sections 41, 41 at both left and right positions on the inner surface of the rear section Ar.

[0032] This auxiliary filtration unit 11 may be prepared separately, or it is possible to use the remaining portion when the outer frame filtration section 2o described above is formed. In the example, this remaining portion is used. Specifically, a rectangular piece of sponge material is prepared, and the middle portion is cut along a rectangular cut line, so that the outer frame block is used as the outer frame filtration section 2o described above, while the inner rectangular block is used as the auxiliary filtration unit 11. Then, inside the auxiliary filtration unit 11, a "mountain"-shaped auxiliary inlet section embedding space 31 is formed, as shown in FIG. 7.

[0033] The auxiliary inflow section 5ir includes an air lift pipe unit 32 shown in Fig. 6. This air lift pipe unit 32 includes an air lift pipe main body 33 having an axis in the vertical direction and configured in the same manner as the above-mentioned air lift pipe 27, a horizontal pipe section 34 connected at a right angle at the center in the left-right direction so as to be able to communicate with a lower end opening 33i of the air lift pipe main body 33, and a pair of left and right cylindrical inflow sections 5irp, 5irq connected to left and right end openings 34m, 34m of the horizontal pipe section 34 so as to be able to communicate with each other.

[0034] In this case, one of the cylindrical inflow parts 5irp, that is, the right cylindrical inflow part 5irp shown by the solid line in Fig. 6, is provided with a cylindrical part 35 that stands upward from the end opening 34m and has a closed upper end, and has a configuration in which a large number of water passage holes Hr... are formed on the peripheral surface 35f of this cylindrical part 35. Although the right cylindrical inflow part 5irp has been described above, the left cylindrical inflow part 5irq can also be configured in the same way as the right cylindrical inflow part 5irp, except that it is bilaterally symmetrical to the right cylindrical inflow part 5irp.

[0035] Therefore, the main filtration unit Uf and the auxiliary filtration unit Ur can be assembled as follows: The procedure for assembling the main parts of the main filtration unit Uf and the auxiliary filtration unit Ur will be described below with reference to Fig. 7 and other drawings.

[0036] First, the outer frame filtration unit 2o is installed on the inner surface of the bottom part Ad in the water tank A. Next, the filter support 4 is housed in the outer frame filtration unit 2o from the direction of the arrow F1 shown in Fig. 7. The lower part of the air lift pipe 27, which is divided into upper and lower parts, is fixed to this filter support 4. Next, the inner frame filtration unit 2i is housed inside the outer frame filtration unit 2o from the direction of the arrow F2 shown in Fig. 7. In this case, a through hole is formed in the inner frame filtration unit 2i, through which the lower part of the air lift pipe 27 passes.

[0037] In addition, soil G is accommodated inside the soil case 3 as shown by the arrow F3 in FIG. 7. In this case, the soil G is accommodated up to the vicinity of the upper end edge of the soil case 3. Then, the soil case 3 accommodating the soil G is accommodated inside the inner frame filtration section 2i from the direction of the arrow F4 in FIG. 7, and the legs 3p... of the soil case 3 are inserted into the insertion holes 4x... provided in the filter plate section 4u of the filter support 4, and the lower ends of the legs 3p... are abutted against the upper surface of the lower plate section 4d. After this, the upper part of the air lift pipe 27 is attached to the lower part. The assembled main filtration section Uf is shown in FIG. 1 to FIG. 3.

[0038] On the other hand, the auxiliary filtration unit 11 of the auxiliary filtration section Ur is prepared, and the auxiliary inlet section 5ir is inserted and buried in the auxiliary inlet section burying space 31 formed inside. Then, the auxiliary filtration unit 11 with the auxiliary inlet section 5ir buried therein is installed on the inner surface of the rear section Ar of the aquarium A from the arrow F5 as shown in Fig. 7. In this case, the auxiliary filtration unit 11 is inserted and held in the hooks 41... provided on the rear section Ar.

[0039] The branch hose section 36 branched from the air hose 26 of the aeration unit 5 is housed in advance inside the air lift pipe main body 33 of the auxiliary inflow section 5ir, and the air outlet 36s located at the lower end of the branch hose section 36 is located near the lower end of the air lift pipe main body 33 as shown in Figure 6. 5er indicates the outflow section located at the upper end of the air lift pipe main body 33.

[0040] This makes it possible to assemble the auxiliary filtration section Ur, which houses the auxiliary inflow section 5ir, shown in FIG.

[0041] Next, the method of use and the function (action) of the filtration device 1 according to this embodiment will be described with reference to the respective drawings.

[0042] Now, let us assume that the air pump 25 is operated. The air generated by the operation of the air pump 25 is supplied to the air hose 26. As a result, in the main filtration section Uf, the air flows through the air hose 26 as shown by the dotted arrow Fa in Fig. 3, and is discharged from the air discharge port 26s. The discharged air then rises inside the air lift pipe 27 and is released into the water tank A from the outlet section 5ef.

[0043] As the air rises in the air lift pipe 27, the culture water W in the air lift pipe 27 also flows upward and is discharged from the outlet 5ef into the aquarium A. As a result, the culture water W in the hollow portion 21m of the filter support 4 also flows into the air lift pipe 27 from the inlet 5if.

[0044] As a result, the breeding water W in the aquarium A passes through the inside of the filtration unit 2 (outer frame filtration section 2o, inner frame filtration section 2i) and the soil G, and reaches one surface 4us of the filter plate section 4u of the filter support 4. The breeding water W then passes through the numerous water passage holes H... (Hn..., Hm..., Hd...) provided in the filter plate section 4u, and flows into the hollow section 21m of the filter support 4. In other words, the breeding water W circulates along the circulation path C, and is filtered by the filtration unit 2 (outer frame filtration section 2o, inner frame filtration section 2i) and the soil G.

[0045] In this way, in the main filtration section Uf, when the filtration unit 2, soil case 3, filter support 4 and aeration unit 5 are provided, the breeding water W inside the aquarium A flows through the route of the filtration unit 2 and / or the soil case 3, the filter support 4 and the inlet section 5if of the aeration unit 5, and further circulates through the circulation route C flowing out from the outlet section 5ef of the aeration unit 5, so that the contaminants in the breeding water W can be filtered by the planar dispersion caused by the combination of the filtration unit 2 and / or the soil case 3 and the filter support 4, thereby enabling efficient and effective filtering. Moreover, it also contributes to reducing initial costs, as a commercially available aeration unit 5 can be used as is.

[0046] Moreover, the main filtration section Uf basically comprises a filtration unit 2 formed from a water-permeable porous sponge Sd, a water-permeable soil case 3 for containing soil G, a filter support 4 having a filter plate section 4u with numerous water passage holes H (Hn, Hm, Hd)... with one side 4us facing the filtration unit 2 and / or the soil case 3, and an aeration unit 5 having an inlet section 5if facing a predetermined position on the other side 4ur of the filter plate section 4u, and the hole diameters Dn, Dm, Dd of the numerous water passage holes H (Hn, Hm, Hd)... are formed to gradually increase in size in the direction Fd away from the position on the inlet section 5if side, so that the flow velocity is faster at a position closer to the inlet section 5if side, and the flow velocity toward the inlet section 5if slows down as the position moves away from the position on the inlet section 5if side. However, since the hole diameters Dn..., Dm..., Dd... of each water passage hole portion Hn..., Hm..., Hd... become larger in stages, the flow velocity (flow rate) of the breeding water W passing through the water passage holes Hn..., Hm..., Hd... of the filter plate portion 4u is uniform.

[0047] This prevents the filtering capacity of the filtration unit 2 and / or soil case 3 of the breeding water W from becoming unevenly distributed, and distributes and evenly distributes the filtering performance, improving the overall filtering capacity while also lengthening the maintenance intervals for cleaning, replacement, etc., thereby reducing running costs.

[0048] On the other hand, by operating the air pump 25, the generated air passes through the branch hose section 36 branched off from the air hose 26 in the auxiliary filtration section Ur, and is discharged from the air discharge port 36s as shown in Figures 5 and 6. Then, the discharged air rises inside the air lift pipe main body section 33 as shown by the dotted arrow Fa, and is discharged from the outlet section 5er into the aquarium A. The culture water W inside the air lift pipe main body section 33 also flows upward and is discharged from the outlet section 5er into the aquarium A, and the culture water W inside the horizontal pipe section 34 and the cylindrical inlet sections 5irp, 5irq flows into the air lift pipe main body section 33.

[0049] As a result, the breeding water W in the aquarium A passes through the auxiliary filtration unit 11 and flows into the cylindrical inflow portions 5irp, 5irq through each water passage hole portion Hr.... That is, the breeding water W circulates along the auxiliary circulation path Cr shown in FIG. 5, and is filtered by the auxiliary filtration unit 11.

[0050] In this way, by installing an auxiliary filtration unit 11 formed from a porous sponge Sr having water permeability on the inner surface of the rear portion Ar of the aquarium A, and an aeration unit 5 with an auxiliary inlet portion 5ir facing the inside of this auxiliary filtration unit 11, the filtration area can be expanded, thereby improving the overall filtration performance (capacity). In addition, the aesthetic effect of the aquarium A can be improved by, for example, coloring the rear area of ​​the aquarium A black.

[0051] Furthermore, if the auxiliary inlet section 5ir is provided with a cylindrical inlet section 5r having a number of water passage holes Hr... formed on its peripheral surface, the inlet points for the rearing water W can be widely dispersed, thereby enabling efficient and more effective filtering.

[0052] Although the preferred embodiment has been described in detail above, the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, numerical values, etc. can be changed, added, or deleted as desired without departing from the gist of the present invention.

[0053] For example, the shape of the aquarium A is arbitrary, and the shape (outer shape, etc.) of the filtration unit 2 and the auxiliary filtration unit 11 can be implemented in any shape according to the shape of the aquarium A. The porous sponge Sd mentioned in the embodiment is an example, and a porous sponge Sd of various physical properties having similar functions can be used. Similarly, it is preferable that the soil G contains one or more of gravel, soil, and filter material, but the application of other soils is not excluded. In addition, the auxiliary filtration unit 11 and the auxiliary inlet part 5ir are not excluded from being provided on the left and right side parts of the aquarium A. In particular, the auxiliary filtration part Ur is implemented in a different form (structure and principle) from the main filtration part Uf, but the auxiliary filtration part Ur can also be configured in the same way as the main filtration part Uf by providing a filter support 4 similar to the main filtration part Uf. [Industrial Applicability]

[0054] The filtration device according to the present invention can be used in various aquariums, including home and commercial aquariums, for housing water for breeding and aquatic organisms. [Explanation of symbols]

[0055] 1: filtration device, 2: filtration unit, 3: soil case, 4: filter support, 4u: filter plate, 4us: one side of the filter plate, 4ur: other side of the filter plate, 5: aeration unit, 5if: inlet, 5ef: outlet, 5r: cylindrical inlet, 5ir: auxiliary inlet, 11: auxiliary filtration unit, A: aquarium, Ar: rear part of the aquarium, W: breeding water, Sd: porous sponge, G: soil, H(Hn, Hm, Hd)...: water passage hole, Hr...: water passage hole, Fd: direction away from the inlet side position, Dn: hole diameter, Dm: hole diameter, Dd: hole diameter, C: circulation path

Claims

1. a filter unit formed of a porous sponge having water permeability; a soil case having water permeability for containing soil; a filter support having a filter plate portion with a large number of water passage holes and one side of which faces the filtration unit and / or the soil case; an auxiliary filtration unit formed of a porous sponge having water permeability and installed on the inner surface of the rear part of the aquarium; and an aeration unit having an inlet portion facing a predetermined position on the other side of the filter plate portion and an auxiliary inlet portion facing the inside of the auxiliary filtration unit, wherein the hole diameter of the large number of water passage holes is gradually increased in a direction away from the inlet portion side.

2. 2. The filtration device for an aquarium tank for aquatic organisms according to claim 1, wherein said soils include at least one or more of gravel, soil and filtering material.

3. 2. The filtration device for an aquarium for aquatic organisms as described in claim 1, characterized in that the filtration unit, the soil case, the filter support and the aeration unit form a circulation path in which the breeding water inside the aquarium flows through a path in the inlet of the filtration unit and / or the soil case, the filter support and the aeration unit, and flows out from the outlet of the aeration unit.

4. 2. The filtration device for an aquarium for aquatic organisms according to claim 1, wherein the auxiliary inlet portion comprises a cylindrical inlet portion having a number of holes formed on its circumferential surface.

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