JPH11319811A - Filtering device, filtering metod and water level holding unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively and simply constitute a dry type, a wet type and a wet and dry type filtering device by exchanging the parts. SOLUTION: This filtering device 4 is provided with a water sucking pipe 6 for sucking water in a water tank, filter cases 16, 17, 18 packed with filters for filtering water sucked through the water sucking pipe 6 and a water discharge pipe 8 for returning the water filtered through those filter cases 16, 17, 18 to the water tank. A water pouring pipe 12 for pouring the water sucked through the water sucking pipe 6 to the filter and a water level holding body 11 for holding a water level in a water storage tank constant, at a time of filtering impurities contained in the water by circulating the water in the water tank, are provided exchangeably in accordance with a desired water level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device and a filtering method, for example, a filtering device and a filtering method for circulating water in an aquarium for breeding fish to filter impurities contained in the water, and a water level holding unit. .

[0002]

2. Description of the Related Art Generally, when fish and aquatic plants for ornamental and aquaculture purposes are bred in an aquarium, organic substances such as fish food residues and fish excreta are generated, and the water quality of the aquarium deteriorates.

For this reason, the water in the water tank is filtered by a filter. In recent years, the water in the water tank is immersed in a filter made of a porous ceramic or the like to adsorb and filter impurities and to form water in the water. A filtration device that decomposes organic matter by respiration of aerobic bacteria has been put to practical use.

As an example of this type of filtration device, a filtration device called a wet and dry system has been proposed. As shown in FIG. 13, this wet and dry filtration device is provided with a biological filtration filter that decomposes impurities by the growth of bacteria and an adsorption filtration filter that adsorbs and removes impurities in a water tank of the filtration device. As the sewage in the water tank is sucked by the water suction hose and poured into the water tank of the filtration device, the float rises due to buoyancy and the drain hose is connected. Then, the filtered water in the water storage tank is pumped up by the pump through the drainage hose, whereby the filtered water is returned to the water tank, and the amount of water in the water storage tank is reduced. On the other hand, when the filtered water in the water tank is drained and the water level decreases, the float descends and cuts off the communication with the drain hose, so that only the dirty water is injected into the water tank and the water level is reduced. Rise.

[0005] That is, due to the ups and downs of the float, a full state (wet) in which the filtration filter is submerged and an irrigation state (dry) in which the filtration filter is exposed to the outside are alternately repeated. In the irrigated state, the bacteria decompose to decompose due to bacterial growth.

[0006] There is also a filtration device called a full dry system in which the inside of the filtration device is kept in a irrigated state and the filtration filter is always exposed to the outside air. In this full-dry type filtration device, a siphon system in which sewage is fed into the device by a siphon principle through a water absorption hose provided in a water tank, and as shown in FIG. 14, sewage exceeding a certain water level is passed through a water inlet. And an overflow method of feeding into a water tank.

[0007]

However, in the conventional filtration device, the float is operated in a complicated manner in order to switch the water in the water storage tank between the full state and the irrigated state. There is a disadvantage that it becomes complicated.

In addition, when the biological filter is submerged in water, the biological filtration filter is submerged, resulting in a shortage of oxygen supply, and the decomposition of impurities by bacteria, that is, the biological filtration cannot be performed sufficiently. For this reason, there is also a disadvantage that the filtration efficiency of the biological filtration is reduced by the period from the full state to the irrigated state.

Further, in the siphon system, a water amount adjusting mechanism for maintaining the water level in the filtration device in an irrigated state is required. However, since this mechanism is electrically and mechanically complicated, it causes an increase in cost. I have.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a filtration device, a filtration method, and a water level holding unit capable of reducing the number of parts, simplifying the structure and reducing the cost. To provide.

Another object of the present invention is to provide a filtration device, a filtration method, and a water level holding unit capable of improving the filtration efficiency relating to biological filtration as compared with a wet and dry filtration device.

Another object of the present invention is to provide a filtering device, a filtering method, and a water level holding unit which can selectively and simply constitute a filtering device of a dry type, a wet type, and a wet & dry type by replacing parts. To provide.

[0013]

Means for Solving the Problems In order to solve the above-mentioned problems and achieve the object, a filtration device of the present invention has the following arrangement. That is, the water tank includes a water absorbing means for sucking water in the water tank, a filter means for filtering the water sucked by the water absorbing means, and a drain means for returning the water filtered by the filter means to the water tank. Circulating in each said means, and filtering the impurities contained in said water, a water injection means for pouring the water sucked by said water absorption means to said filter means, a water level in a water storage tank of said filtration apparatus Is maintained at a predetermined water level.

Further, the filtration method of the present invention has the following features. That is, in a filtering device comprising: a water absorbing means for sucking water in a water tank, a filter means for filtering the water sucked by the water absorbing means, and a drain means for returning the water filtered by the filter means to the water tank. A method of filtering impurities contained in the water by circulating water in a water tank by the respective means, and pouring the water sucked by the water absorbing means to the filter means, The water level in the water storage tank is maintained at a predetermined level.

Further, the water level holding unit of the present invention has the following configuration. That is, it is provided detachably in a filtration device that circulates water in the water tank and filters impurities contained in the water,
The water level in the water storage tank of the filtration device is maintained at a predetermined water level.

[0016]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

In the following embodiments, water before filtration is referred to as sewage, and water after filtration is referred to as filtered water. [Water tank facility including filtration device] FIG. 1 is a diagram showing the overall configuration of a water tank facility including a filtration device according to an embodiment of the present invention.

As shown in FIG. 1, an aquarium equipment 1 includes an aquarium 2
And a filtration device 4 for filtering the water 3 in the water tank 2.

In the water tank 2, ornamental fish or aquaculture (not shown) and aquatic plants are stored together with water 3, and gravel 5 is spread on the bottom of the tank.

The filtration device 4 is installed at a position lower than the water tank 2, and a water suction hose 6, a safety valve 7, and a drain hose 8 are connected to each other. One end of the water-absorbing hose 6 is connected to a strainer 6a in the water in the water tank 2, and the water 3 filtered by the strainer 6a is sucked by a natural head and injected into a water tank constituting the outer shape of the filtering device 4. I do. Also,
An air introduction valve 50 for circulating air in the water storage tank together with the sewage is provided in a part of the water absorption hose 6 above the water surface of the water tank 2. The amount of air introduced into the casing 10 can be appropriately set by adjusting the opening of the air introduction valve 50.

The safety valve 7 sucks air into the water storage tank or discharges air to the outside according to a change in the water level in the water storage tank of the filtration device 4.

One end of the drain hose 8 has a shower head 9
, And the filtered water filtered by the filtration device 4 is showered into the water tank 2 by the shower head 9 and drained. Note that the shower head 9 can be omitted. [Filtering Device of First Embodiment] FIG. 2 is a sectional view of a filtering device of a first embodiment according to the present invention.

As shown in FIG. 2, the filtering device 4 has a casing 10 having an outer shape and a storage tank for sewage.
A water level holder 11 is built therein as water level holding means. An upper lid 10b is removably attached to an upper end opening of a bottomed cylindrical outer frame 10a of the casing 10 by a plurality of buckle mechanisms (not shown). The upper lid 10b has a short tubular water inlet end 6a connected to the water suction hose 6 in a watertight manner,
Small-diameter short tubular exhaust port end 7 airtightly connected to safety valve 7
a, a short tubular drain port end 8a which is connected to the drain hose 8 in a watertight manner is integrally provided with each of them.

As shown in FIG. 3 and FIG.
0, inside the outer frame 10a, the filter cases 16, 17,
18 are concentrically stacked in three upper and lower stages. Each of the filter cases 16 to 18 is a biological filtration filter that decomposes organic matter by respiration of aerobic bacteria generated in water,
Alternatively, a porous filter medium made of ceramics or plastic is filled, and an adsorption filtration filter that adsorbs and filters impurities by immersing water in a water tank into the filter medium is held.

In this embodiment, the filter cases 16 to 1
It is conceivable to use a biological filtration filter or an adsorption filtration filter by filling all of 8 or use a combination of a biological filtration filter and an adsorption filtration filter. The effect is obtained.

Each of the filter cases 16 to 18 is in the form of a cylinder without a cover and a bottom, and has side surfaces 16 a and 17 facing the water level holder 11.
a, 18a, the bottom of which has a number of water holes 16b,
17b and 18b are drilled.

At the upper end of the uppermost filter case 16, a cover 15 is provided. The lid 15 has a water guide plate 15a formed to protrude upward, and a number of water holes 15b communicating with the lower filter case 17.
The water guide plate 15a controls the flow of the sewage such that the sewage poured from the water inlet 12a reaches the entire surface of the filter case 16 evenly. Further, as shown in FIG.
5, a partition plate 15c extends so as to be in close contact with the cover 19 of the water level holder 11. This partition plate 15c is
Dirty water poured from the water inlet 12a and the filter case 16
The inside of the casing 10 is partitioned up and down so that the filtered water that has passed through # 18 does not mix inside the casing 10.

As shown in FIG. 5, a water inlet 12a for pouring sewage sucked by the water suction hose 6 into a water storage tank is formed on the side of the upper end of the water injection pipe 12, and the lower end is closed. At the same time, the shaft 12b extends toward the bottom inside the casing. The upper end of the water injection pipe 12 is fixed to the upper part of the cover 19 by a nut 31, and the lower end of the shaft 12 b is fixed to the cover 19 by a nut 32.
Is fixed at the bottom. On the outer periphery of the shaft 12b,
A slider sleeve 13 as an on-off valve is slidably fitted in the longitudinal axis direction. The slider sleeve 13 is formed slightly larger than the outer shape of the water injection pipe 12 so that the upper end thereof can move to a position to close the water injection port 12a of the water injection pipe 12, and has a buoyancy against water at a lower portion of its longitudinal axis. Float 14 is fixed. The buoyancy of the float 14 allows the slider sleeve 13 to move up and down along the shaft 12b.

Here, the water level holder 11 can be easily mounted as a cartridge inside the casing 10 in a state where each component is incorporated in the cover 19. Note that a cartridge mounting portion communicating with the inside may be provided outside the casing 10 so that the cartridge can be set outside.

The mounting position of the float 14 on the slider sleeve 13 is at a position W1 where the water level is slightly immersed in the bottom of the lowermost filter case 18, and the upper end of the slider sleeve 13 partially covers the water inlet 12a of the water inlet pipe 12. It is set to the position to close.

The side surfaces 16a- of the filter cases 16-18
18a is poured from the water inlet 12a of the water level holder 11,
It functions as a partition wall that separates a flow path R1 of the sewage water that sequentially falls into the lower filter cases 17 and 18 and a flow path R2 of the filtered water filtered through each of the filter cases 16 to 18. By providing the side surfaces 16a to 18a as the partition walls and the partition plate 15c, it is possible to prevent mixing of the sewage and the filtered water, and it is not necessary to separately provide a partition wall for partitioning the two flow paths R1 and R2. The number of parts can be reduced and the configuration can be simplified.

The water inlet tube 12, the slider sleeve 13 and the float 14 are attached to the rectangular tubular cover 19, and the water inlet 12 is located at a position corresponding to the water inlet 12 a of the water inlet tube 12.
An opening for pouring sewage discharged from a into the upper part of the uppermost filter case 16 is formed.

A drain pump 21 is provided on the upper lid 10b of the casing 10. The drainage amount of the drainage pump 21 is controlled so that the supply and demand of the flow rate of sewage supplied from the water suction hose 6 to the water storage tank in the filtration device 4 and the filtered water discharged from the water storage tank are balanced. The suction port of the drain pump 21 communicates with the inside of the casing 10. A drain extension pipe 23 is detachably attached to the suction port by a nipple-shaped mounting ring 22 fitted and fastened to the outer periphery thereof. The drain extension pipe 23 is a casing 10
The filtered water is sucked from the lower end of the drain extension pipe 23, and the drain water 24, the drain end 8
a and the drain hose 8 sequentially returns to the water tank 2 again.

According to the water level in the casing 10, the safety valve 7 blows out the air in the casing 10 to the outside on the water surface of the water tank 2 and exhausts the air, while performing a breathing action of sucking the outside air. The safety valve 7 is a case 7 as shown in FIGS.
2, a float chamber 74 that accommodates a float 73 floating in water in a floating manner is formed. The case 72 has an inlet end 75 communicating with the float chamber 74 and an outlet end 76 integrally connected thereto.

The float 73 has a horizontal swinging link 77 fixed to the left end in the figure, and the tip of the swinging link 77 is swingably attached to the upper end of the vertical fixed link 78 in the figure. The lower end of the fixed link 78 in the figure is fixed to the inner wall of the case 75.

The swing link 77 has a rising link 79 rotatably connected to an end of the float 73 on the float 73 side. The outlet channel 76a is normally opened by the weight of the valve body 80 and the float 73. An O-ring is externally fitted and fixed to the outer peripheral surface of the body of the valve element 80, and the outlet flow path 76
a so as to be in close contact with water-tightly. The inlet end 75 of the main body case 72 is detachably connected to the outlet end 7a of the filter device 4 in an airtight and watertight manner via an O-ring fixed to the outer peripheral surface of the body.

Next, the operation of the safety valve 7 will be described.

When the drainage pump 21 shown in FIG. 2 is operating normally, the water in the casing 10 of the filtration device 4 maintains a predetermined water level W1.

When the water in the casing 10 rises, the air in the casing 10 is pushed out by the rising water surface, and the air exits from the outlet end 7a to the inlet end 75 of the safety valve 7.
, And flows into the float chamber 74. At this time, since the flow path 76a in the outlet end portion 76 is lowered and opened by the weight of the valve body 80 and the float 73, the air flowing into the float chamber 74 passes through the outlet flow path 76a in the opening. It is discharged outside.

On the other hand, when the water in the casing 10 of the filtering device 4 descends, the space in the casing 10 is reduced to a negative pressure by the descending water surface, so that the outside air is released from the safety valve 7.
Through the outlet flow channel 76a, the float chamber 74, the inside of the inlet end 75, and the inside of the outlet end 7a of the filtration device 4 in sequence,
It is sucked into the casing 10.

That is, the air in the filtration device 4 is exhausted to the outside through the safety valve 7 according to the water level, while the outside air is sucked into the casing 10.

If the drain pump 21 stops operating due to a failure or the like and water in the casing 10 of the filtration device 4 flows into the float chamber 74 from the outlet end 7a via the inlet end 75 of the safety valve 7, , The float 73 floats and the valve body 80
And the outlet channel 76a is closed in a watertight manner.

As described above, since the water flowing into the float chamber 74 can be prevented from being drained to the outside from the discharge port end 76, the surroundings can be prevented from being contaminated by the drainage. it can.

Reference numeral 20 denotes a heater, which is provided for heating the water in the casing 10, but may be omitted. [Operation of Water Level Holder] In the present embodiment, the drain pump 21
Is provided on the upper lid 10b, first, it is necessary to pour water into the casing 10 until the drainage pump 21 contacts the water. This is because when the drain pump 21 is in contact with the air, it runs idle and cannot pump water.

When the inside of the casing 10 is substantially full,
As shown in FIG. 8A, since the float 14 is lifted by buoyancy, the water inlet 12a is closed, and the waste water is
0 No water is injected inside. When the drainage pump 21 is normally operated from the water level W, the water in the casing 10 is gradually drained, and the water level W gradually decreases, and FIG.
As shown in (2), the float 14 stops at the water level W1 where the amount of water injected from the water inlet 12a and the amount of water discharged by the drain pump 21 are balanced.

That is, the water 3 in the water tank 2 shown in FIG. 1 is filtered by the strainer 6a, passes through the water suction hose 6, and flows at a predetermined flow rate from the water inlet 12a by a natural head to the upper part of the upper filter case 16 in the casing 10. At the same time, the filtered water in the casing 10 is constantly drained by the drain extension pipe 23 and the drain pump 21 by the drain pump 21,
Injection port 12a that balances water supply flow rate and drainage flow rate
The float 14 stops at the opening and the water level of.

In the state shown in FIG. 8A, since the water inlet 12a is closed, no waste water is poured into the filter case 16 from the water inlet 12a.

On the other hand, as shown in FIG. 8B, as the amount of drainage increases, the water level W gradually decreases from the state of FIG. 6A, and the water inlet 12a gradually opens. Casing 1
When the water level within 0 reaches the position W1, the amount of water supplied from the water inlet 12a and the amount of water discharged by the drain pump 21 become substantially constant, and the water level inside the casing 10 is maintained at W1. In other words, the water level holder 11 is the casing 1 in the state of FIG.
The water level within 0 is held at the position W1.

Here, the degree of opening of the water inlet 12a varies depending on the amount of drainage, but the drainage pump 21 is adjusted so that the amount of water supply in the fully opened state does not become smaller or larger than the amount of drainage.

Here, the slider sleeve 13 and the float 14 operate in a somewhat natural state due to their buoyancy and the pressure of the sewage from the water inlet 12a.

When the drainage pump 21 is arranged at the bottom of the casing 10, the operation described above is reversed.
The water level W gradually rises from a low state, and the water inlet 12
The opening degree a is held at the position of the water level W1.

In the filtration device of the first embodiment, the biological filtration filter is always exposed to the outside air, so that it can be used as a dry filtration device. [Filtering Device of Second Embodiment] FIG. 9 is a sectional view of a filtering device of a second embodiment according to the present invention.

As shown in FIG. 9, different from the first embodiment, each of the filter cases 16 to 18 is filled with a porous filter material made of ceramics or plastic, and the water in the water tank is immersed in the filter material to remove impurities. An adsorption filtration filter for performing adsorption filtration is held, and the water level holding body 11 is configured to hold the water level in the casing 10 at a position W2 such that the water level in the casing 10 becomes a water level at which the adsorption filtration filter is submerged.

In this embodiment, the filter cases 16 to 1
8 is filled with an adsorptive filtration filter. However, this is not because a biological filtration filter cannot be used, and all filter cases 16 to 18 are always in a submerged state. Is difficult to obtain, and the filtration effect is higher when an adsorption filtration filter is used.

The slider sleeve 33 is formed shorter than that of the first embodiment, and the float 14 is attached to the slider sleeve 33 at a position W2 at which the upper part of the uppermost filter case 16 is substantially submerged. The upper end of the sleeve 33 is set at a position that partially closes the water inlet 12 a of the water inlet pipe 12.

As shown in FIG. 10A, the water level W in the casing 10 is filled until the water level reaches the drainage pump 21, and the water is gradually drained by the drainage pump 21 from the state in which the water inlet 12a is closed. Going down.

Then, as shown in FIG. 10B, as the amount of drainage increases, the water level W gradually decreases from the state of FIG. 10B, and the water inlet 12a gradually opens. When the water level in the casing 10 reaches the position W2, the water inlet 12a
And the amount of water discharged by the drain pump 21 becomes substantially constant, and the water level inside the casing 10 is maintained at W2.

In the other components, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the filtration device of the second embodiment, the adsorption filtration filter is always submerged, so that it can be used as a wet filtration device. [Filtering Device of Third Embodiment] FIG. 11 is a sectional view of a filtering device of a third embodiment according to the present invention.

As shown in FIG. 11, different from the first and second embodiments, the upper and middle filter cases 16, 17
Is filled with a biological filtration filter, and an adsorption filtration filter is held in a lower filter case 18.
Lowers the water level in the casing 10 so that the lower adsorption filtration filter is submerged, that is, the biological filter is exposed to the outside air.
3 is held.

In the present embodiment, the upper and middle filter cases 16 and 17 are filled with a biological filtration filter and used, but a biological filtration filter may be used only in the upper stage. However, the filtering effect is higher when the biological filtration filter is disposed in the upper stage, and the adsorption filtration filter is disposed below the biological filtration filter, and only the adsorption filtration filter is constantly submerged. In addition, all the filter cases 16 to 18 may be filled with the adsorption filtration filter.

The slider sleeve 43 is formed shorter than the first embodiment and longer than the second embodiment. The mounting position of the float 14 on the slider sleeve 43 substantially submerges the filter case 18 having the lowest water level. Position W3
Thus, the upper end of the slider sleeve 43 is set to a position where the water inlet 12a of the water inlet pipe 12 is partially closed.

As shown in FIG. 12A, the water level W in the casing 10 is inserted until the water level reaches the drainage pump 21, and the water is gradually drained by the drainage pump 21 from the state where the water inlet 12a is closed. Going down.

As shown in FIG. 12B, as the amount of drainage increases, the water level W gradually decreases from the state shown in FIG. 12A, the water inlet 12a gradually opens, and the casing 10 When the internal water level reaches the position W3, the amount of water supplied from the water inlet 12a and the amount of water discharged by the drain pump 21 become substantially constant, and the water level inside the casing 10 is maintained at W3.

In the filtration device of the third embodiment, the biological filtration filter is always exposed to the outside air, and the adsorption filtration filter is always submerged. Can improve the filtration efficiency.

In the first and third embodiments, since air is circulated in the casing 10 by the safety valve 7 and the air introduction valve 50, the air is sufficiently supplied to the aerobic bacteria of the biological filtration filter to proliferate. In addition, it can be activated to further enhance the organic matter decomposition ability, improve the water purification efficiency, and extend the life. Furthermore, when the water level in the casing rises,
Since the air above the water surface can be pushed up in the casing 10 and exhausted to the outside through the safety valve 77, the air can also be breathed by the aerobic bacteria in the casing 10.

In each of the above embodiments, since the water level holder 11 is unitized, the dry type, wet type, and wet & dry type filtration device can be changed easily and quickly. That is, the water supply pipe 12 of the water level holder 11 is pulled out from the water supply port end 6b and removed, and at the same time, the nipple-shaped mounting ring 22 is loosened and removed from the drain extension pipe 23 and the suction port of the drain pump 21. The cover 19 may be taken out, a filter corresponding to each system may be filled in the filter case, and the slider sleeve 13 and the float 14 may be replaced with a corresponding one.

In the other components, the same members as those of the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

According to each of the above embodiments, the number of parts can be reduced, and the structure can be simplified and the cost can be reduced.
By replacing parts, dry type, wet type, wet &
A dry filtration device can be selectively and easily configured.

The present invention can be applied to a modification or a modification of the above embodiment without departing from the gist of the invention.

In each of the above embodiments, the number of filters installed in the casing is not limited to three. Also, if the shapes of the slider sleeve 13 and the float 14 are prepared so as to match the upper, middle and lower filter positions, the biological filtration filter and the adsorption filtration filter can be arbitrarily changed only by replacing the slider sleeve 13 and the float 14. Can be combined.

When pouring sewage from the water inlet 12a into the upper filter case 16, a shower nozzle or the like may be provided in the water inlet 12a so that the sewage is evenly and uniformly poured into the filter.

Further, a water amount adjusting device capable of electrically or mechanically controlling the amount of water absorption and drainage may be added.

Also, the float can be pivotally supported on the slider sleeve to increase the buoyancy of the float.

As described above, according to the present invention,
The number of parts can be reduced, and the structure can be simplified and the cost can be reduced.

Further, as compared with a conventional wet and dry type filtration device, the filtration efficiency related to biological filtration can be improved.

Further, by exchanging parts, a dry type, a wet type, and a wet & dry type filtration device can be selectively and simply constructed.

[0077]

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of a water tank facility including a filtration device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the filtration device according to the first embodiment of the present invention.

FIG. 3 is a schematic perspective view showing a filtration device of the present embodiment.

FIG. 4 is a side sectional view showing the filtration device of the present embodiment.

FIG. 5 is an exploded perspective view of a water level holder.

FIG. 6 is a sectional view of a safety valve.

FIG. 7 is a sectional view of a safety valve.

FIG. 8A is a diagram illustrating the operation of the water level holder according to the first embodiment.

FIG. 8B is a diagram illustrating the operation of the water level holder according to the first embodiment.

FIG. 9 is a sectional view of a filtration device according to a second embodiment of the present invention.

FIG. 10A is a diagram illustrating the operation of a water level holder according to a second embodiment.

FIG. 10B is a diagram illustrating the operation of the water level holder according to the second embodiment.

FIG. 11 is a sectional view of a filtration device according to a third embodiment of the present invention.

FIG. 12A is a diagram illustrating the operation of a water level holder according to a third embodiment.

FIG. 12B is a diagram illustrating the operation of the water level holder according to the third embodiment.

FIG. 13 is a schematic diagram showing a configuration of a conventional wet and dry filtration device.

FIG. 14 is a schematic diagram showing a configuration of a conventional overflow type filtration device.

[Description of Signs] 1 Water tank equipment 2 Water tank 4 Filtration device 5 Gravel 6 Water supply hose 6a Water supply port end 7 Safety valve 8 Drain hose 9 Shower head 10 Casing 11 Water level holder 12 Water inlet pipe 12a Water inlet 13 Slider sleeve 14 Float 15 Lid Body 16-18 Filter case 16a-18a Side surface 19 Cover 21 Drain pump 22 Mounting ring 23 Drain extension pipe

Claims (24)

[Claims] 1. A water absorbing means for sucking water from a water tank, a filter means for filtering the water sucked by the water absorbing means, and a drain means for returning the water filtered by the filter means to the water tank. In a filtration device for circulating water in a water tank by each of the means and filtering impurities contained in the water, a water injection means for pouring water sucked by the water absorption means into the filter means, and a water storage tank of the filtration apparatus A water level maintaining means for maintaining a water level in the inside at a predetermined water level. 2. The filter means comprises a biological filtration filter for decomposing impurities due to the growth of bacteria, an adsorption filtration filter for adsorbing and removing impurities, or a combination of the biological filtration filter and the adsorption filtration filter. The filtering device according to claim 1, wherein the holding means holds the biological filtration filter at a water level exposed to the outside air by opening and closing a water inlet of the water injection means. 3. The filter means comprises a biological filtration filter that decomposes impurities due to the growth of bacteria, an adsorption filtration filter that adsorbs and removes impurities, or a combination of the biological filtration filter and the adsorption filtration filter. The filtering device according to claim 1, wherein the holding unit holds the adsorption filter at a water level at which the water is submerged by opening and closing a water inlet of the water injection unit. 4. The filter according to claim 2, wherein the adsorption filtration filter is disposed below the biological filtration filter.
Or the filtration device according to 3. 5. The filter according to claim 2, wherein the water level holding means holds the adsorption filtration filter at a water level at which the water is exposed to the outside air by opening and closing a water inlet of the water injection means. apparatus. 6. A float having buoyancy with respect to water, an opening / closing valve provided on the float and using the buoyancy of the float to open and close a water inlet of the water injection means, wherein the float is provided with: And a shaft for supporting the open / close valve movably in the vertical direction in the water storage tank, wherein the open / close valve interlocks the water injection port in conjunction with the vertical movement of the float according to the water level in the water storage tank. The filtration device according to any one of claims 1 to 5, wherein the filtration device is opened and closed. 7. When the water sucked from the water injection unit by the water absorption unit is poured into the filter unit, the water supply unit further comprises an adjustment unit for uniformly pouring the water to the filter unit. The filtering device according to any one of claims 1 to 6, wherein 8. The filtering device according to claim 1, wherein the water level holding means is adjustable or replaceable according to a desired water level. 9. The filtering device according to claim 1, wherein the filter unit is vertically stacked in one or more stages. 10. The filtering device according to claim 1, further comprising an air introducing means for circulating air in the water storage tank through the water absorbing means. 11. The aquarium is used for rearing appreciation fish,
2. The water according to claim 1, wherein the water is freshwater or seawater.
The filtration device according to any one of claims 1 to 10. 12. Water absorbing means for sucking water in a water tank, filter means for filtering the water sucked by the water absorbing means,
In a filtration device comprising a drainage unit that returns water filtered by the filter unit to a water tank, a filtration method of circulating water in the water tank by each of the units and filtering impurities contained in the water, A filtration method, wherein a water level in a water storage tank of the filtration device is maintained at a predetermined water level while pouring water sucked by the water absorption device into the filter device. 13. The storage means according to claim 1, wherein said filter means comprises a biological filtration filter that decomposes impurities by growing bacteria, an adsorption filtration filter that adsorbs and removes impurities, or a combination of the biological filtration filter and the adsorption filtration filter. 13. The method according to claim 12, wherein the water in the tank is maintained at a water level at which the biological filtration filter is exposed to the outside air. 14. The storage means comprises a biological filtration filter that decomposes impurities by growing bacteria, an adsorption filtration filter that adsorbs and removes impurities, or a combination of the biological filtration filter and the adsorption filtration filter. 13. The method according to claim 12, wherein the water in the tank is maintained at a water level at which the adsorption filter is submerged. 15. The filtration method according to claim 13, wherein the adsorption filtration filter is disposed below the biological filtration filter. 16. The filtering method according to claim 13, wherein the water in the water storage tank is maintained at a water level at which the adsorption filtration filter is exposed to outside air. 17. The water in the water storage tank includes a float having buoyancy with respect to the water, an on-off valve fixed to the float, for opening and closing a water injection port for pouring the water in the water tank, and the float and the on-off valve. The on-off valve is held by a shaft that supports the tank so that it can move vertically in the water tank, and the on-off valve opens and closes the water inlet in conjunction with the vertical movement of the float according to the water level in the water tank. 17. The method according to claim 12, wherein:
The filtration method according to any one of the above. 18. The apparatus according to claim 1, further comprising an adjusting means for uniformly pouring the water into the filter means when the water sucked by the water absorbing means is poured into the filter means. The filtration method according to any one of 12 to 17, wherein 19. The filtration method according to claim 12, wherein the float and the on-off valve can be adjusted or exchanged according to a desired water level. 20. The filtering method according to claim 12, wherein the filter means is vertically stacked in one or more stages. 21. The filtering device according to claim 1, wherein air is circulated in the water storage tank through the water absorbing means. 22. The aquarium is used for raising appreciation fish,
2. The water according to claim 1, wherein the water is freshwater or seawater.
20. The filtration method according to any one of 1 to 19. 23. A filter device for circulating water in a water tank and filtering the impurities contained in the water, the filter device being detachably provided, and maintaining a water level in a water tank of the filter device at a predetermined water level. Water level holding unit. 24. The water level holding unit, comprising: a float having buoyancy with respect to water; an open / close valve fixed to the float, for opening / closing a water injection port into the water storage tank; and the float and the open / close valve. A shaft that supports the water tank in a vertically movable manner in the water storage tank, wherein the on-off valve opens and closes the water inlet in conjunction with the vertical movement of the float according to the water level in the water storage tank. The water level holding unit according to claim 23, wherein