JPH0773644B2 - Filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the Invention (1) Field of Industrial Application The present invention relates to a filtration device suitably used in an aquarium for raising ornamental fish.

(2) Conventional technology Conventionally, as such a filtering device, a so-called bottom-type filtering device that uses gravel spread in a water tank as a filtering material, or a method of purifying water by a filtering material while circulating water in the water tank It is general that each of the above-mentioned submerged filtration devices is used alone, but such a filtration device used alone has a problem that the filtering action is insufficient and the frequency of cleaning the inside of the water tank increases.

Therefore, a filtering device having the functions of both of the filtering devices has already been proposed as disclosed in, for example, Japanese Patent Laid-Open No. 172322/1985.

(3) Problems to be Solved by the Invention However, in the above-mentioned proposed device, since the lower surface of the flat box-shaped bottom case for water absorption for filtration having a plurality of water absorption holes formed in the upper wall is opened entirely, A water flow path cannot be formed in the case unless the lower edge of the opening is in close contact with the bottom of the water tank. For this reason, it is difficult to directly bury the water absorption case in the gravel that is already spread in the water tank.When setting the water absorption case, remove a large amount of gravel from the inside of the water tank to expose the bottom of the water tank. In this exposed condition, it is necessary to re-lay the gravel above the water absorbing case set on the bottom of the water tank, which makes the work very troublesome, and the water absorbing case set in this way is subject to vibration and external force. If you float a little from the bottom of the aquarium,
There is a problem that gravel enters through the gap between them and a predetermined flow passage cannot be secured inside the water absorbing case, so that the water absorbing action of each water absorbing port of the case is not properly performed.

Further, in the above-mentioned proposed device, the bottom filtration with gravel and the underwater filtration with the filter medium are performed in series, that is,
Since the flow passage in the water absorption case is in direct communication with the unpurified chamber in the filtration case and is in a positional relationship in series with the purification chamber in the filtration case in the water flow direction, the filtration material in the filtration case When the clogs occur, not only the filtering function of the filter material is deteriorated, but also the flow of water in the water intake case internal flow passage is deteriorated, and the filtering function of the gravel is also deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a filtration device that can solve the above-mentioned problems of conventional devices.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a hollow closed bottom filtration water absorption case in which an internal space serves as a water flow passage, on the outer surface thereof, A plurality of water inlets connected to the passage are opened at intervals, and the water absorption case is installed inside the water tank so as to be buried in the gravel at the bottom of the water tank, while the water intake is opened on the outer surface in a hollow closed state. The filtration case for submersible filtration is installed in the water tank so as to project above the gravel, and inside the filtration case, there is an unpurified chamber that is continuous with the water intake port and is adjacent to the unpurified chamber with a filter medium sandwiched therebetween. A purifying chamber is provided, and the purifying chamber and the flow passage are arranged in parallel with each other in a common suction means attached to the filtration case so as to suck up the water in the purifying chamber and the flow passage at the same time and return them to the upper part in the water tank. The first feature is the connection, and this feature In addition, the water absorbing casing, the tubular extends linearly to form a first flow path first
A plurality of tubular members that are connected to the suction unit at right angles to the first suction unit by forming a second flow passage that communicates at right angles with the first flow passage and are spaced apart in the longitudinal direction of the first suction unit. A second suction section,
The first suction part is composed of a tubular third suction part that is parallel to the second suction parts and is connected to the second suction parts at a right angle and forms a third flow passage that connects the second flow passages in common. It is a feature of.

(2) Action According to the operation of the suction means, the water in the purification chamber is sucked up, and accordingly, the water sucked from the intake port flows through the filter medium into the purification chamber and is purified. In parallel with this,
The water in the flow passage in the water absorption case is sucked up by the suction means, and accordingly, the water in the water tank flows into the flow passage from the water suction port while being filtered through the gravel. In this case, since the water absorbing case is formed in a hollow and hermetically sealed manner and the inner space serves as a flow passage, it is possible to reliably prevent gravel from entering the flow passage even if the water absorbing case is not brought into close contact with the bottom of the water tank, and the predetermined volume is maintained. The flow passage of is surely formed in the gravel, thereby always stabilizing the water absorbing action by the water inlet of the water absorbing case, and
When installing the water absorption case, it is not necessary to remove a large amount of gravel from the inside of the water tank to expose the bottom of the water tank. Further, since the flow passage in the water absorption case and the purification chamber in the filtration case are connected in parallel to the common suction means, even if the filter medium is clogged, the water in the flow passage is not removed by the suction means. The wicking function does not deteriorate.

According to the second characteristic, in particular,
The first, second and third suction portions are each formed in a straight line, and since there is an empty space between them, the water absorption case can be easily buried in the gravel.

If the lower part of each suction part is made substantially Y-shaped in cross section as in the embodiment, the resistance received when burying each suction part in the gravel is reduced, and the water intake port is arranged below the brim. By doing so, it is possible to effectively prevent the gravel from being strongly pressed against the water intake side by the weight of the gravel by the above-mentioned brim, so that the clogging of the water intake port due to the gravel is prevented as much as possible, and the crossing of the third flow passage is further prevented. By making the area larger than the cross-sectional area of the first and second flow passages, it becomes possible to suck water substantially uniformly over the entire area of the water absorbing case.

(3) Examples Hereinafter, examples of the present invention will be described with reference to the drawings.
First, referring to FIG. 1 showing an embodiment of the present invention, an aquarium 1 for breeding ornamental fish such as goldfish, tropical fish, saltwater fish is formed in a box shape, and the aquarium 1 is orthogonal to each other. The water tank 1 is installed in the corner 2 formed by the two wall surfaces 1a and 1b.
A hollow and hermetically-sealed filtration case 3 for submersible filtration is attached to a gravel 4 that is spread inside. In addition, a hollow closed bottom water absorption case 5 for filtering the bottom is also installed at the bottom of the water tank 1 by being buried in the gravel 4, and water purified by flowing through the gravel 4 is filtered from the water absorption case 5. The water is guided into the case 3, and is further returned to the upper part in the water tank 1 together with the water filtered by the filtration case 3.

Referring also to FIGS. 2 to 6, the filtration case 3 is basically made of, for example, a synthetic resin in a hollow cylindrical shape, and its cross-sectional shape is closer to the corner 2 side. The back wall 6 facing the front wall 7 and the front wall 7 facing the inner side of the aquarium 1 constitute a closed cross section and are connected to each other.

The back wall 6 is formed by connecting a pair of mounting portions 8 and 9 with a connecting portion 10. Both mounting portions 8 and 9 have an angle α formed by the wall surfaces 1a and 1b of the aquarium 1, that is, The connection portion 10 is arranged slightly larger than 90 degrees, and the connecting portion 10 is formed in an arc shape that is convexly curved toward the front wall 7. On the other hand, the front wall 7 is formed in a trapezoidal shape that narrows toward the inner side of the aquarium 1, and both side ends of the front wall 7 and outer ends of the mounting portions 8 and 9 of the back wall 6 are mutually disposed. They are polymerized and connected.

A top plate 11 that closes the upper end of the filtration case 3 when connected to the back wall 6 is integrally provided at the upper end of the front wall 7, and the inside of the filtration case 3 is provided substantially at the center of the top plate 11. A drain pipe 12 is provided to form a drainage port 13 with its inner end slightly protruding and extending upward, and further bent inward of the water tank 1.
Further, at the lower end of the front wall 7 and the lower end of the back wall 6, plate portions are provided so as to form a bottom plate 14 that closes the lower end of the filtration case 3 when they are connected to each other. A through hole 15 is bored.

A suction pipe extending vertically is provided at approximately the center of the filtration case 3.
16 are fixed and arranged. That is, support plates 17 and 18 having a shape corresponding to the inner surface shape of the cross section of the filtration case 3 are integrally attached to the upper and lower ends of the suction pipe 16, and are attached to the lower inner surfaces of the back wall 6 and the front wall 7. Support ribs 19 for supporting the support plate 18 are provided in a projecting manner.The support plate 18 is supported by the support collar 19 while the upper support plate 17 is in contact with the top plate 11, and the suction pipe 16 is supported. Are mounted in the filtration case 3. Moreover, the inner end of the discharge pipe 12 is fitted to the upper end of the suction pipe 16 in this mounted state, and the suction pipe 16 communicates with the drain port 13.

With the suction pipe 16 attached, a filtration chamber 20 is defined between both support plates 17 and 18 in the filtration case 3, and the filtration chamber 20 is
A filter medium 21 attached to the suction pipe 16 divides the chamber into an unpurified chamber 22 on the outer side and a purified chamber 23 on the inner side.

Plural places spaced apart in the axial direction of the suction pipe 16, for example, 7
A pair of support arms 24 and 25 projecting toward the connecting portion side of the back wall 6 and the front wall 7 are projected at the location, and a supporting arm 26 projecting toward the connecting portion 10 side of the back wall 6 is projected therefrom. It Both support arms 24,2
Small-diameter shaft portions 27 extending parallel to the suction pipe 16 are integrally provided at the tip of the 5, respectively, and at the tip of the support arm 26,
An engaging portion 28 is integrally provided which is curved so as to correspond to the connecting portion 10 on the back wall 6 and slightly extends from both side ends thereof in parallel with the attaching portions 8 and 9. 28
Is brought into contact with the inner surfaces of the connecting portion 10 and both mounting portions 8 and 9.

The filter material 21 is formed in a rectangular mat shape, and is wound around the support arms 24, 25, 26 of the suction pipe 16 while abutting both ends of the filter material 21 in the longitudinal direction on the support plates 17, 18. That is, both ends in the width direction of the filter medium 21 are engaged with the locking portions 28 at the tips of the support arms 26 so that the small diameter shaft portions 27 at the tips of the both support arms 24 and 25 are bent.

By mounting the suction pipe 16 to which the filter material 21 is attached in the filtration case 3 in this way, the inside of the filtration chamber 20 is partitioned into the unpurified chamber 22 and the purified chamber 23 over the entire length in the longitudinal direction thereof.
The suction pipe 16 is arranged in the purification chamber 23. Moreover, a suction port 29 communicating with the lower portion of the purification chamber 23 is provided at the lower portion of the suction pipe 16. In addition, at the bottom of the front wall 7 of the filtration case 3, there are a plurality of water intakes 30 that are vertically spaced.
However, it is formed in a slit shape so as to communicate with the lower portion of the unpurified chamber 22.

A water intake chamber 31 is defined between the bottom plate 14 of the filtration case 3 and the support plate 18 of the suction pipe 16, and a slit extending vertically is formed in the lower portion of the front wall 7 so as to communicate with the water intake chamber 31. A plurality of auxiliary water intakes 32 are provided.

The water intake chamber 31 and the auxiliary water intake 32 guide a small amount of water bypassing the filter medium 21 to the suction pipe 16, and when the filter case 3 is used alone without using the water suction case 5, a through hole is formed. 15
Is blocked. However, when the filtration case 3 and the water absorption case 5 are jointly used as in the present invention, the water absorption case 5
A connection pipe 33 for guiding the water from the suction pipe 16 is inserted into the lower portion of the suction pipe 16 from the through hole 15 (which allows the purification chamber 23 and the connection pipe 33 (henceforth described later) to the suction pipe 16). Flow passage 61
~ 63) and will be connected in parallel with each other),
The auxiliary water intake 32 and the water intake chamber 31 do not function substantially.

On the other hand, a pair of recesses 34 are provided on the outer surfaces of both mounting portions 8 and 9 of the back wall 6 at intervals vertically.
The suction cups 35 are attached to the recesses 34 at their tips with the mounting portions 8, 9
Are fixed so as to project outward from the outer surface of the.

The connecting pipe 33 has a suction cup 36 at its closed lower end, and in a state where it is adsorbed to the bottom surface 1c of the water tank 1 by the suction cup 36,
It is inserted into the lower part of the suction pipe 16 through the through hole 15. Moreover, a connection port 37 is provided on the lower side surface of the connection pipe 33.

In order to suck up the water in the purification chamber 23 to the water inlet 13, the filter case 3 is provided with a suction means 38.
Reference numeral 38 denotes the suction pipe 16, an air injection member 39 disposed in the lower portion of the suction pipe 16, an air pump as a pressurized air supply source 40, and a space between the air injection member 39 and the pressurized air supply source 40. And a hose 41 that connects

The air injection member 39 is made of, for example, a breathable material such as foamable synthetic resin and is formed in a tubular shape. The air injection member 39 is integrally provided with a connecting pipe portion 42. Connection pipe part 42
One end of a hose 41 is connected to the hose 41, and the hose 41 extends upward in the suction pipe 16 and is an extraction hole 43 provided in the upper portion of the discharge pipe 12.
From the water tank 1, the other end of the hose 41 is connected to a pressurized air supply source 40 arranged outside the water tank 1.

In the suction means 38, by supplying the compressed air from the compressed air supply source 40, the air jetted from the air jetting member 39 becomes fine bubbles and rises in the suction pipe 16 and the discharge pipe 12, As a result, a rising water flow is generated in the suction pipe 16 and the discharge pipe 12.

Referring also to FIG. 7 to FIG. 10, the water absorption case 5 is configured by an upper case 51 and a lower case 52, both made of synthetic resin, being fitted and coupled to each other, and in a straight line. The first suction portion 53 having a tubular shape extending from the first suction portion 53 and a plurality of first suction portions 53 are provided at a plurality of locations, for example, four locations spaced apart in the longitudinal direction of the first suction portion 53.
A plurality of, for example, four tubular second suction portions 54, which are arranged at right angles to each other and extend in a straight line, and second suction portions 54, which are parallel to the first suction portion 53 and are orthogonal to each other, are connected in common. Tubular third
And a suction unit 55.

The upper case 51 has a substantially U-shaped cross-sectional shape in which the first, second and third suction portions 53, 54, 55 are formed downward.
It is formed in a letter shape. Further, the lower case 52 has a substantially V-shaped bottom plate portion 56 having a substantially V-shaped transverse cross-section at the portions forming the first, second and third suction portions 53, 54, 55, and the bottom plate portion thereof. Approximately Y consisting of a leg portion 57 connected to the bent portion of 56
The bottom plate portion 56 of the lower case 52 is fitted in the upper case 51. Moreover, on the inner surface of the upper case 51,
Projections 58 for receiving the upper ends of the bottom plate portions 56 are provided so as to be spaced apart from each other.

Referring also to FIG. 11, a partition plate 59 that abuts the upper case 51 and the lower case 52 to each other to partition the inside of the first suction part 53 into a plurality of parts in the portion forming the first suction part 53. , 60 are respectively provided so as to project, whereby a plurality of, for example, four first flow passages 61 arranged in a line in the longitudinal direction are formed in the first suction portion 53. A second flow passage 62 is formed in each second suction portion 54, and the second suction portion 54 makes the second flow passage 62 communicate with the first flow passage 61 individually. It is connected to the suction unit 53. Furthermore, the third suction unit
A third flow passage 63 having a larger cross-sectional area than the first and second flow passages 61 and 62 is formed in the 55, and each second flow passage is formed.
62 is commonly communicated with the third flow passage 63.

The lower case opening edge of the upper case 51 is integrally provided with a brim 64 projecting to both sides, and water suction ports 65, 66, 67 are bored in the lower case 52 below the brim 64. That is, the first suction unit 53
In the portion corresponding to the bottom plate portion 56 and the leg portion 57 in the lower case 52, the first flow passage is provided on both sides of the partition plate 60.
Small rectangular water inlets 65 communicating with 61 are provided respectively. In addition, in the portion corresponding to the second suction portion 54, at the connection portion of the bottom plate portion 56 and the leg portion 57 in the lower case 52, a plurality of second portions are provided at a plurality of locations, for example, three locations spaced in the longitudinal direction of the second suction portion 54. A small-diameter water inlet 66 communicating with the flow passage 62 is formed. Further, in the portion corresponding to the third suction portion 55, the lower case 52
At the connecting portion of the bottom plate portion 56 and the leg portion 57 in FIG.
A plurality of places, for example, 3 spaced apart in the longitudinal direction of the suction part 55.
A small-diameter water intake port 67 is bored at a location.

Upper case corresponding to both ends along the longitudinal direction of the first suction portion 53
Semi-circular projections are provided on the lower case 52 and the lower case 52 so as to form short tubular connection parts 68, 69 when they are fitted to each other. Further, semi-circular projections respectively project to correspond to the longitudinal ends of the third suction portion 55 and to form short tubular connection portions 70 and 71 when fitted to the upper case 51 and the lower case 52, respectively. Set up.

Cylindrical caps 72 having a bottom are fitted to the connecting portions 68, 69 at both ends in the longitudinal direction of the first suction portion 53 so as to tighten the outer circumferences, and these caps 72 serve in the longitudinal direction of the first suction portion 53. Both ends are closed. In addition, the third suction unit 55
One end of a flexible tube 73 is fitted and connected to the connecting portion 70 at one end in the longitudinal direction of the connecting tube 70 so as to tighten the outer periphery, and the other end of the flexible tube 73 is connected to the connecting port 37 of the connecting tube 33. It is connected in a complicated way. Further, a bottomed cylindrical cap 74 is fitted to the connecting portion 71 at the other longitudinal end of the third suction portion 55 so as to tighten the outer periphery. Therefore, one end of the third flow passage 63 in the third suction portion 55 is connected to the connecting pipe 33 via the flexible pipe 73.
Is communicated within.

Moreover, in the upper case 51 and the lower case 52, by fitting the cap 72 to the connecting portions 68 and 69, fitting the flexible tube 73 to the connecting portion 70, and fitting the cap 74 to the connecting portion 71, The fitted state is maintained.

Next, the operation of this embodiment will be described. When mounting the filtration device to the water tank 1, the filtration case 3 and the water absorption case 5 are assembled and the connecting pipe 33 is fixed to the bottom surface 1c of the water tank 1. That is, by sucking the suction cup 36 on the bottom surface 1c, the connecting pipe 33 is fixed to the bottom surface 1c in the upright posture.

Next, the filter case 3 is lowered along the corner 2 so that the connecting pipe 33 is inserted into the suction pipe 16 from the through hole 15, and the filter case 3 is fixed to the corner 2 by the suction cup 35.

The procedure for attaching the filter case 3 to the corner portion 2 will be described with reference to FIG. 12. First, as shown in FIG.
One mounting portion 8 in the direction of arrow Pa toward one wall surface 1a
It is pressed in the direction so that the suction cup 35 is attracted to the wall surface 1a.
Next, as shown in FIG. 12 (b), the other mounting portion 9 is mounted in the direction of arrow Pb toward the other wall surface 1b, and the suction cup 35 is mounted on the wall surface.
Try to stick to 1b. At this time, since the angle α formed by both mounting portions 8 and 9 is larger than the angle formed between both wall surfaces 1a and 1b, one mounting portion 8 is connected with its front wall 7 side end portion pressed against the wall surface 1a. The portion 10 side is separated from the side surface 1a, and the suction cup 35 of the mounting portion 8
And the closed space between the wall surface 1a is decompressed. Therefore, the suction force of the suction cup 35 is increased, and the mounting portion 8 is securely mounted on the wall surface 1a.

When the pressing state of the mounting portion 9 is released, as shown in FIG. 4, the mounting portion 9 is brought into contact with the wall surface 1b at the end portion on the front wall 7 side by the suction force to the wall surface 1a of the suction cup 35 on the mounting portion 8 side. The side of the connecting portion 10 comes into contact with and separates from the wall surface 1b. As a result, the sealed space between the suction cup 35 and the wall surface 1b is depressurized in the same manner as described above, the suction force of the suction cup 35 is increased, and the mounting portion 9 is securely attached to the wall surface 1b. Moreover, in this attached state, the intake port 30 is determined to be located above the gravel 4.

In this state, the front wall 7 side ends of the mounting portions 8 and 9 of the back wall 6 are in close contact with both wall surfaces 1a and 1b of the water tank 1,
The space between the filter case 3 and the corner 2 is closed. Therefore, it is possible to reliably prevent the ornamental fish from getting stuck between the filtration case 3 and the aquarium 1 and being unable to move.

Next, the water absorption case 5 is installed at the bottom of the water tank 1,
The first, second and third suction parts 53, 54 in the water absorption case 5,
Since a rectangular empty space is provided between 55 and the lower case 52 is formed in a substantially Y-shaped cross section, even if the gravel 4 is spread in the aquarium 1, the gravel 4
By pushing the water absorbing case 5 therein, the water absorbing case 5 can be installed extremely easily while being buried in the gravel 4.

After the water absorption case 5 is installed, the flexible tube 73 connected to the water absorption case 5 is inserted into the connection port 37 of the connection tube 33 to be connected. This connecting operation can be easily performed in water, and the gravel 4 does not enter the connecting pipe 33. The attachment order of the filtration case 3 and the water absorption case 5 may be reversed from the above.

When the pressurized air supply source 40 is operated after the mounting is completed in this way, a rising water flow is generated in the suction pipe 16. As a result, in the filtration case 3, the water sucked into the unpurified chamber 22 from the water intake 30 flows into the purification chamber 23 while being circulated and purified through the filtering material 21, and further sucked from the suction port 29. The inside of the pipe 16 is raised and the water is returned from the drain port 13 to the water tank 1. At this time, since the suction port 29 is provided in the lower portion of the suction pipe 16, the suction port 29 receives the total water pressure from the surface of the water to the suction port 29 to efficiently suck up the water. Can and unpurified room
The water flowing from 22 to the purification chamber 23 flows through the entire surface of the filter medium 21 and is efficiently purified.

On the other hand, also in the water absorption case 5, in response to the rising water flow in the suction pipe 16, a water flow from the first flow passage 61 to the third flow passage 63 via the second flow passage 62 is generated, and the gravel is generated. The water purified by flowing through 4 flows into the first, second and third flow passages 61, 62 and 63 from the respective water inlets 65, 66 and 67, and further through the flexible pipe 73 and the connecting pipe 33. It is sucked up by the suction pipe 33.

At this time, since the water intakes 65, 66, 67 are arranged below the brim 64, it is effective for the gravel 64 to strongly press the gravel 4 against the water intakes 65 to 67 by the weight of the gravel 4. Can be avoided. Moreover, since the water intakes 65 to 67 are formed relatively small, the gravel 4 is clogged and the water intakes 65 to 67 are filled.
It is possible to prevent the occurrence of clogging in the area.

Further, since the third flow passage 63 on the suction pipe 16 side is formed to have a relatively large cross-sectional area, the flow loss along the longitudinal direction thereof is extremely small, and the third flow passage 63 communicates with each other in pairs. The amount of water flowing through the first and second flow passages 61 and 62 is equalized, the amount of water flowing through the gravel 4 is made uniform over a wide area, and the water is efficiently filtered by using the gravel 4 in a wide range. can do.

In this way, the filtration using the gravel 4 and the filtration using the filtering material 21 can be combined in a well-balanced manner to sufficiently filter the water in the water tank 1. Moreover, since the water rising in the suction pipe 16 is composed of the water purified by the filtering material 21 and the water purified by the gravel 4, the water intake in the filtering case 3
The speed at which the water flowing from 30 flows through the filter medium 21 and the gravel 4
The speed at which water flows through the inside can be adjusted to an appropriate value for promoting the growth of chlorella and aerobic microorganisms in the filter medium 21 and the gravel 4, and the aerobic microorganisms cause a residual feed of ornamental fish. It is possible to effectively decompose organic matter such as slag and dung to prevent early clogging of the filter medium 21 and dirt and clogging of the four layers of gravel, and it is possible to use chlorella and the like as a live feed for ornamental fish.

Further, in particular, the water absorption case 5 to be buried in the gravel 4 is formed in a hollow and hermetically sealed manner, and the internal space thereof is defined as the flow paths 61 to 63. Therefore, the flow path 61 is not required to be brought into close contact with the bottom surface of the water tank 1. To 63 can be surely avoided and the flow passages 61 to 63 having a predetermined volume can be surely formed in the gravel 4, and as a result, the water absorption action of the water absorption ports 65 to 67 of the water absorption case 5 can be stabilized. In addition, when installing the water absorption case 5, it is not necessary to remove a large amount of gravel 4 from the inside of the water tank 1 to expose the bottom surface of the water tank 1. Furthermore, the flow passage in the water absorption case 5
Since 61 to 63 and the purification chamber 23 in the filtration case 3 are connected in parallel to the common suction means 38 (suction tube 16), even if the filter medium 21 is clogged, the suction means 38, the water suction function of the flow passages 61 to 63 does not deteriorate.

FIG. 13 shows another embodiment of the present invention.
Two water absorbing cases 5, 5 are installed on the bottom of the inside so as to be connected to each other. That is, the first in the one water absorption case 5
The connection part 69 of the suction part 53 and the connection part 68 of the first suction part 53 in the other water absorption case 5 are connected to each other by a connecting pipe 75, and the connection part of the third suction part 55 in one water absorption case 5.
71 and the connecting portion 70 of the third suction portion 55 of the other water absorbing case 5 are connected to each other by a connecting pipe 76.

In this way, a plurality of water absorption cases 5 are formed depending on the area of the water tank 1.
Can be connected to each other to adjust the filtration area of the gravel 4.

C. Effects of the Invention As described above, the device of the present invention, bottom filtration using gravel,
Since two systems of underwater filtration using a filtering material can be performed in parallel by a common suction means, the water in the aquarium can be efficiently filtered and the filtering load of the filtering material is reduced. It

Also, since the water absorption case to be buried in the gravel is formed in a hollow and hermetically sealed state and the internal space serves as the flow passage, it is possible to ensure that the gravel can enter the flow passage even if the water absorption case is not attached to the bottom of the water tank. It can be avoided and the flow passage of a predetermined volume can be surely formed in the gravel, so that the water absorbing action of the water absorbing port of the water absorbing case can always be stabilized, and moreover, when installing the water absorbing case, Since it is not necessary to remove the gravel from the inside of the water tank to expose the bottom of the water tank, the installation work becomes easier. Further, since the flow passage in the water absorption case and the purification chamber in the filtration case are connected in parallel to the common suction means, even if the filter medium is clogged, the water in the flow passage is not removed by the suction means. There is no fear that the wicking function will be impaired in any way, and therefore, in combination with the effect of stabilizing the water absorbing action of the water inlet as described above, a sufficient and appropriate filtering action by the gravel can be continuously obtained. .

According to the second characteristic, in particular,
Since the first, second and third suction parts are each formed in a straight line and there is an empty space between them, it is possible to easily push the water absorption case into the gravel covered in the water tank and bury it. Therefore, the work of setting the water absorption case can be performed efficiently and easily.

[Brief description of drawings]

1 to 12 show an embodiment of the present invention,
1 is an overall perspective view, FIG. 2 is an enlarged view taken along line II-II of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG.
IV-IV line enlarged sectional view of the figure, FIG. 5 is a VV line enlarged sectional view of FIG. 3, FIG. 6 is a VI-VI line sectional view of FIG. 4, and FIG. 7 is a bottom view of the water absorption case. 8 is a sectional view taken along the line VIII-VIII of FIG. 2, FIG. 9 is a sectional view taken along the line IX-IX of FIG. 8, and FIG.
FIG. 11 is a partially enlarged perspective view of the water absorbing case, FIG. 12 is a sectional view corresponding to FIG. 4 showing a procedure for attaching the filtration case, and FIG. 2 is a plan view of the embodiment of FIG. 1 ... Water tank, 3 ... Filter case for underwater filtration, 4 ... Gravel, 5 ... Water absorption case for bottom filtration, 21 ... Filter material, 22
...... Unpurified room, 23 …… Purified room, 30 …… Intake port, 38 …… Sucking up means, 53 to 55 …… First to third suction parts, 61 to 63 …… Flow passage, 64 …… Tsuba , 65-67 …… Suction port, 73 …… Flexible tube

Claims (5)

[Claims] 1. A plurality of water inlets connected to the flow passages (61 to 63) are provided on an outer surface of a hollow closed bottom water absorption case (5) for filtration, the inner space of which serves as water flow passages (61 to 63). 65 to 67) are spaced apart from each other, and the water absorption case (5) is installed in the water tank (1) so as to be buried in the gravel (4) at the inner bottom of the water tank (1), while the outer surface is provided. A hollow hermetic filter case (3) for underwater filtration having an intake port (30) is installed in the water tank (1) so as to project above the gravel (4), and the filter case (3) is placed in the filter case (3). Is an unpurified chamber (22) connected to the intake port (30) and a filter medium (21) in the unpurified chamber (22).
And a purifying chamber (23) adjacent to each other with the purifying chamber (23) and the flow passages (61-63) simultaneously sucked up and returned to the upper part of the water tank (1). A filtration device characterized in that the purification chamber (23) and the flow passages (61 to 63) are connected in parallel to each other to a common suction means (38) mounted on (3). 2. A plurality of water inlets connected to the flow passages (61 to 63) are provided on an outer surface of a hollow closed bottom water absorption case (5) for filtration, the inner space of which serves as water flow passages (61 to 63). 65 to 67) are spaced apart from each other, and the water absorption case (5) is installed in the water tank (1) so as to be buried in the gravel (4) at the inner bottom of the water tank (1), while the outer surface is provided. A hollow hermetic filter case (3) for underwater filtration having an intake port (30) is installed in the water tank (1) so as to project above the gravel (4), and the filter case (3) is placed in the filter case (3). Is an unpurified chamber (22) connected to the intake port (30) and a filter medium (21) in the unpurified chamber (22).
And a purifying chamber (23) adjacent to each other with the purifying chamber (23) and the flow passages (61-63) simultaneously sucked up and returned to the upper part of the water tank (1). The purification chamber (23) and the flow passages (61 to 63) are connected in parallel with each other to a common suction means (38) mounted on (3), and the water absorption case (5) includes the first flow passage (61). ) Forming a straight line and forming a second flow passage (62) communicating with the first flow passage (61) at a right angle to the first suction portion (53) forming a first suction portion (53). 1st at positions spaced in the longitudinal direction of
A plurality of tubular second suction portions (54) continuously connected to the suction portion (53) at right angles, and at right angles to each second suction portion (54) in parallel with the first suction portion (53). With each second flow passage (62)
And a tubular third suction part (55) forming a third flow passage (63) for communicating the above in common. 3. The first, second and third suction parts (53-55)
The filtration device according to claim 1, wherein a lower part of the filter is formed in a substantially Y-shaped cross section. 4. The first, second and third suction parts (53-55)
The collar (64) that overhangs on both sides of the is integrally projected.
The water inlets (65 to 67) are located below the collar (64) at the first position.
The filtration device according to claim 1 or 2, wherein the filtration device is provided in the second and third suction portions (53 to 55). 5. The suction means (38) is connected to the third suction part (55), and the cross-sectional area of the third flow passage (63) is the same as that of the first and second flow passages (61, 62). The filtering device according to claim 1, 2 or 3, characterized in that it is defined to be larger than the cross-sectional area.