JP2004057071A - Inside type filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inside type filter to be set in a water tank for raising aquarium fishes and to filter and clean water in the water tank, with which a person does not put the hands into the water tank deeply, either of two parts into which a filter case is divided is separated in the water tank while leaving the other in the water tank as it is, taken out from the water tank together with the filter element unit of the separated part and maintenance such as cleaning, replacement, etc., of the filter element is simply and readily carried out. <P>SOLUTION: The filter case 5 dividable into the two parts of the filter F is constituted of the first case half body 5F and the second case half body 5S detachably connected to the first case half body set in the water tank 1. The second case half body 5S while being provided with the filter element unit 6 as it is is removed from the first case half body 5F and from the water surface of the water tank 1 or assembled into the first case half body. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an internal filtering device provided in an aquarium for breeding ornamental fish such as goldfish, tropical fish, saltwater fish and the like so as to circulate and filter water in the aquarium.
[0002]
[Prior art]
Generally, in order to breed and breed ornamental fish such as goldfish and tropical fish in a water tank, as a filtration device for filtering and purifying water in the water tank, the filter body is installed in the water tank, and an air pump is used to filter the water inside the water tank. 2. Description of the Related Art An internal filtration device that purifies water by circulating water through a filter medium in a filtration body is known (for example, see Japanese Patent Publication No. 3-7406).
[0003]
[Problems to be solved by the invention]
By the way, such an internal filtration device is provided with its main part inside a water tank, and the water in the water tank can be purified by passing through a filter medium immersed in the water in the water tank. Yes, it is widely used, but the filter elements immersed in the water in the water tank are gradually adhering and accumulating dirt such as feces and remaining food that have been removed by filtration, resulting in a decrease in filtration efficiency. In addition, maintenance work such as cleaning and replacement of the filter element needs to be performed periodically since the appearance of the tank is impaired.
[0004]
However, conventionally, in order to perform the above operation, it is necessary for a person to put his / her hands deeply into the water of the water tank and take out the entire filter main body out of the water tank. There is a problem in that he must dislike "soaking his / her hands in the water in the aquarium" and pollute the aquarium water.
[0005]
Therefore, the present invention, when performing operations such as cleaning and replacement of the filtration element,
(1) Work to take out the entire filtration case containing the filtration element out of the water tank,
(2) The work that a person puts his hands deeply into the water in the aquarium,
A new internal filtration device that can perform maintenance work such as cleaning and replacement of the filtration element simply and easily without polluting the water in the water tank by hand without performing. It is intended to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the object, the invention according to claim 1 includes a filter case extending vertically and installed in a water tank, a filter element unit detachably provided in the filter case, and A drain pipe removably connected to the upper end of the formed suction passage, and a rising water flow generated in the suction passage by a pump to suck unpurified water in the water tank into the filtration case, After being passed through the filtration element unit for purification, the internal filtration device is configured such that the water is returned to the water tank through a suction passage and a drain pipe. In the internal filtration device, the first and second filtration cases can be separated and combined with each other. The first case half is attached to the wall surface of the water tank, and has a plurality of guide grooves formed on both left and right side edges thereof and extending vertically. A locking hole is formed, and a locking receiving portion is further formed at the bottom thereof. On the other hand, the second case half has a receiving portion for receiving the filtration element unit, and the lower edge of both sides thereof has A guide projection is provided to be slidably engaged with the guide groove, and engagement protrusions to be engaged with the locking holes are provided on both side edges thereof. A rotary engaging portion to be received is formed, and the second case half receiving the filter element unit from above the water tank can be connected while the first case half is mounted in the water tank. According to a second aspect of the present invention, in the first aspect of the present invention, the drain pipe can be used for photographing when the second case half is connected to the first case half. The method according to claim 3, further comprising: In the invention according to claim 1 or 2, the filtering element unit comprises an element holder and a filtering element wound around the outer periphery thereof, and the element holder is connected to a pair of hinge pieces so as to be openable and closable. The element holder is characterized in that, after the filter element is mounted in the open state, the filter element is closed in the closed state, so that it is wound around the outer periphery thereof and held.
[0007]
According to the above inventions, when maintenance such as cleaning and replacement of the filtration element of the filtration element unit is performed, the first half of the case is left in the water tank, and furthermore, a person operates the water in the water tank. The second case half, in which the filter element unit is installed, can be easily assembled or removed from the first case half without putting a hand deeply into the first case half, thereby cleaning and replacing the filter element. The work can be performed extremely simply and easily, and the water in the water tank is not contaminated by hand.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0009]
First, a first embodiment of the present invention will be described with reference to FIGS.
[0010]
1 is a perspective view when the filtration device is installed in a water tank, FIG. 2 is a partially cutaway front view of the filtration device as viewed in the direction of arrow 2 in FIG. 1, and FIG. 3 is a cross section taken along line 3-3 in FIG. 4 is a sectional view taken along line 4-4 in FIG. 2, FIG. 5 is a sectional view taken along line 5-5 in FIG. 2, FIG. 6 is a sectional view taken along line 6-6 in FIG. 7 is an exploded cross-sectional view of the filtration device along the line 7-7 in FIG. 2, FIG. 8 is a front view of the first case half, and FIG. 9 is a view of the filtration case along the line 9-9 in FIG. FIG. 10 is a bottom view of the filtration case as viewed in the direction of arrow 10 in FIG. 9, FIG. 11 is a sectional view when disassembled and assembled into the filtration case, and FIG. 12 is a partially cutaway front view of the filtration element unit. 13 is a cross-sectional view showing the open / closed state of the filter element unit along the line 13-13 in FIG. 12, FIG. 14 is a side view of the element holder, and FIG. FIG. 16 is a rear view of the element holder as viewed in the direction of arrow 16 in FIG. 14, FIG. 17 is a perspective view showing an assembling sequence of the filtration element unit, and FIGS. FIG. 20 and FIG. 20 are cross-sectional views taken along line 20-20 in FIG.
[0011]
As shown in FIGS. 1 to 6, the internal filtering device F according to the present invention includes a plurality of water tanks 1 formed in a rectangular parallelepiped formed at a corner 2 formed by two mutually orthogonal wall surfaces 1 a and 1 b. It is detachably attached by the suction cup 3. The water in the water tank 1 is sucked into the filtering device F by the operation of the air pump Pu, and after being filtered inside, the purified water is returned to the water tank 1.
[0012]
The filtration device F is connected to a two-part filtration case 5, a filtration element unit 6 detachably attached to the filtration case 5, and an upper end of a suction passage 10 provided in the filtration element unit 6. And a suction hose 8 penetrating through the drainage pipe 7 and inserted into the suction passage 10. An air pump Pu provided outside the water tank 1 is provided at an upper end of the suction hose 8. The airstone 9 is connected to the lower end thereof. As shown in FIGS. 3 and 5, an unpurified chamber Cd is formed between the filtration case 5 and the filtration element unit 6, and a purification chamber Cc is formed in the suction passage 10 in the filtration element unit 6. ing.
[0013]
When the air pump Pu is operated, the pressurized air rises in the suction passage 10 through the suction hose 8 and the airstone 9 and generates a rising water flow in the suction passage 10. Thereby, as shown by the arrow a in FIG. 3, the unpurified water in the water tank 1 is sucked into the unpurified chamber Cd from the water intake port 12 opened at the lower part of the filtration case 5, and the unpurified water in the unpurified chamber Cd Water flows into the purification chamber Cc while being purified through the filtration element 51 of the filtration element unit 6 as shown by the arrow b in FIG. As a result, as shown by the arrow c in FIG. In addition, as the rising water flow is generated in the suction passage 10, the water in the water tank 1 is also transferred to the suction passage 10 from the auxiliary water intake 13 opened at the lower end of the filtration case 5 as shown by an arrow d in FIG. Can be sucked up. Therefore, the water rising in the suction passage 10 is composed of water purified by flowing through the filtration element from the water intake port 12 and water sucked from the auxiliary water intake port 13 through the water intake chamber 14.
[0014]
Note that reference numeral 74 in FIG. 1 denotes gravel such as Oiso laid on the bottom of the water tank 1.
[0015]
Next, the structure of each component constituting the filtering device F that operates as described above will be described.
[0016]
[Filter case 5]
The filtering case 5 is formed of a hard synthetic resin material in a vertically long cylindrical shape, and is fixed to the inner wall surface at the corner of the water tank 11 with the suction cup 3 and the first case half 5F. A second case half 5S detachably connected to the opening of the body 5F.
[0017]
As shown in FIGS. 5 to 8, the first case half 5 </ b> F is formed in a fan shape in cross section, and includes a case wall 16 arranged facing a corner of the water tank 1 </ b> V. , A pair of back walls 16a, 16a arranged along the inner wall surface of the corner portion 2 of the water tank 1 and a connecting wall 16b integrally connecting them, and the pair of back walls 16a, 16a are mutually connected. The angle formed is slightly larger than the angle of the corner of the water tank 1, that is, 90 degrees. A bottom wall 17 is formed integrally with the inner surface at the lower end of the case wall 16 and receives a rotation engaging portion 23 of a second case half 5S described later with a slight gap above it. The lock receiving portion 18 is formed integrally. The suction cups 3 are detachably fitted on the upper and lower surfaces of the back surfaces of the pair of back walls 16a, 16a of the first case half 5F, respectively. It is fixed to the inner wall surface of the corner 2 of the water tank 1 by suction. Then, as described later, the filter element unit 6 can be cleaned and replaced while the first case half 5F is mounted in the water tank 1. A plurality of reinforcing ribs 19 (see FIG. 8) are integrally formed on the inner surfaces of the pair of back walls 16a, 16a of the first case half 5F. It functions as a spacing member for forming an unpurified chamber Cd between the case 5 and a filtration element unit 6 described below.
[0018]
On the other hand, the second case half 5S is formed in a trapezoidal shape that narrows toward the center of the water tank 11, and the case wall 21 has a front wall 21a facing the center of the water tank 1, and A pair of left and right side walls 21b, 21b extending outward and inclined toward the first case half 5F, and a filter element unit 6 described later is detachably supported in the second case half 5S. Is done. A bottom wall 22 is formed integrally with the lower edge of the case wall 21 and has a slight gap above the bottom wall 22 to support the filter element unit 6 and to receive the locking receiving portion 18 of the first case half 5F. A rotatable engaging portion 23 rotatably locked to the rotatable member is integrally formed, and a pair of insertion tongue pieces 24, 24 are integrally formed on the rotatable engaging portion 23 in a downward direction. In addition, the lower part of the case wall 21 of the second case half 5S is provided with the water inlet 12 formed of a plurality of slits, and the auxiliary water inlet 13 is further opened below the water inlet 12.
[0019]
The first and second case halves 5F and 5S are provided with connection means according to the present invention, which can be easily assembled and separated from above the water surface of the water tank 1 without immersing the hands in water. .
[0020]
As shown in FIGS. 5, 7, and 8, the left and right side edges of the pair of left and right back walls 16a, 16a of the first case half 5F extend vertically along a pair of V-shaped cross sections over their entire length. Are formed, and locking holes 27, 27 are opened in the guide grooves 26, 26 at intervals in the vertical direction. Further, a pair of locking grooves 28, 28 are opened on the left and right sides of the locking receiving portion 18 of the first case half 5F (see FIGS. 7 and 8). The insertion tongues 24, 24 are removably engaged.
[0021]
On the other hand, a pair of guide projections 30, 30 are integrally provided at lower left and right ends of a pair of side walls 21b, 21b of the case wall 21 of the second case half 5S. When assembling the second case half 5S to the first case half 5F, the second case half 5F is guided and engaged in the left and right guide grooves 26, 26 of the first case half 5F. The lower part of 5S is slid from the upper part to the lower part along the pair of guide grooves 26, 26 so that the position of the second case half 5S with respect to the first case half 5F is regulated in the left-right direction. Done.
[0022]
As shown in FIGS. 5, 7, 9, and 11, the left and right side edges of the case wall 21 of the second case half 5S, that is, the side edges of the pair of side walls 21b, 21b are vertically spaced from each other. The two engaging projections 31 are integrally projecting inward, and these engaging projections 31 are located at positions corresponding to the locking holes 27 of the first case half 5F. When the case halves 5F, 5S are assembled, they are engaged with the locking holes 27, 27 (see FIG. 5). As shown in FIG. 7, the pair of insertion tongue pieces 24, 24 of the second case half 5S are inserted into the pair of locking grooves 28, 28 of the first case half 5F.
[0023]
As shown in FIGS. 4 and 6, a top plate 33 for closing the upper end of the filtration case 5 when the first case half 5F is connected thereto is integrally provided at the upper end of the second case half 5S. The top plate 33 is provided with a fan-shaped concave portion 34 which is open inward and upward of the water tank 1 and has a flat rectangular shape. The fan-shaped concave portion 34 has vertical first and second regulating surfaces 34a and 34b which are substantially orthogonal to the inside of the water tank 1 in a horizontal plane, and arc-shaped in the horizontal plane, and the first and second regulating surfaces 34a. , 34b, and a support surface 34d formed in a horizontal fan shape corresponding to the angle between the first and second restriction surfaces 34a, 34b. A through hole 35 is formed in the center of the sector-shaped recess 34 so as to rotatably fit a drain pipe 7 described later. A receiving portion 36 for installing the filter element unit 6 is formed between the top plate 33 and the rotation engaging portion 23 above the bottom wall 22 (see FIG. 11).
[0024]
[Drain pipe 7]
As clearly shown in FIGS. 4 and 6, the drain pipe 7 is supported on the support surface 34d and extends in the horizontal direction, and a horizontal pipe part 7a having a drain port 40 opened at the tip and a vertical pipe part extending in the vertical direction. 7b, an annular groove 41 is formed in the vertical pipe portion 7b, and the annular groove 41 is rotatably fitted in the through hole 35 of the second case half 5S. It is possible to rotate left and right (about 45 °) between the second regulating surfaces 34a and 34b. Further, as described later, the horizontal pipe portion 7a of the drain pipe 7 can be used as a "taking" when connecting the second case half 5S to the first case half 5F. The lower end of the opening of the vertical pipe portion 7b communicates with a suction passage 10 of the filtration element unit 6 described later.
[0025]
[Filter element unit 6]
The filter element unit 6 is detachably accommodated in the first case half 5F and the second case half 5S. The filtration element unit 6 includes an element holder 50 and a filtration element 51 that is removably assembled to the element holder 50. The element holder 50 is formed of a hard synthetic resin material, and includes a plurality of (four) hinges provided with the inner edges of a pair of left and right holder halves 50A, 50B long in the vertical direction at intervals in the longitudinal direction. The pieces 52 are hinged so that they can be opened and closed (about 90 °). The pair of left and right holder halves 50A, 50B are provided with semi-cylindrical portions 53, 53 constituting the water suction passage 10 when they are closed. A plurality (four) of element support pieces 54 projecting outward at a substantially right angle with the piece 52 interposed therebetween are integrally provided. Also, outside the upper and lower ends of the semi-cylindrical portions 53, 53, Triangular end walls 55 and 58 are integrally formed to project from each other. Further, as shown in FIG. 13, on the free end sides of the semi-cylindrical portions 53, 53 of the pair of holder halves 50A, 50B, piercing pieces 56, 56 having a triangular cross section with a sharp tip are provided over substantially the entire length. The piercing pieces 56, 56 are integrally protruded outward, and can be engaged with the filtering element 51 by piercing the filtering element 51, which is porous and elastic. Further, at the lower ends of the semi-cylindrical portions 53, 53 of the pair of holder halves 50A, 50B, suction port halves 57a, 57b forming suction ports 57 provided with a plurality of comb pieces are formed, respectively, as shown in FIG. When the pair of holder halves 50A and 50B are closed as shown in FIG. 5, the suction port halves 57a and 57b are brought into abutment to form the unpurified water suction port 57. As shown in FIG. 12, one of a pair of left and right holder halves 50A, 50B is integrally provided with two hook-shaped engagement hooks 59, 59 spaced apart in the longitudinal direction, and the other holder half. Two hook holes 60, 60 corresponding to the engagement hooks 59, 59 are drilled in the half bodies 50A, 50B, and when the pair of holder halves 50A, 50B are closed, the engagement hooks 59, 59 are provided. , 59 and hook holes 60, 60 respectively engage to hold the pair of holder halves 50A, 50B in the closed position.
[0026]
On the other hand, the filtration element 51 is formed in a rectangular shape from a porous synthetic resin material having elasticity, and its vertical length is substantially the same as the length between the upper and lower end walls 58 and 55 of the element holder 50. Further, the horizontal length is formed to a dimension that is wound around the element holder 50.
[0027]
Next, the procedure for assembling the element holder 50 and the filtration element unit 6 composed of the filtration element 51 will be described with reference to FIGS. 13 and 17. First, the unfolded state shown in FIG. In a state where 50A and 50B are on one plane, the piercing pieces 56 and 56 of the element halves 50A and 50B are connected to the inner surface ends of the U-shaped curved filtering element 51 so as to cover the back side of the element holder 50. When the pair of element halves 50A and 50B is rotated in the closing direction around the hinge piece 52 as shown by an arrow A in FIG. While being guided by the plurality of element support pieces 54, the pair is bent so as to wind around the pair of holder halves 50A and 50B, and as shown in FIG. When the pair of holder halves 50A and 50B are closed and the openings of the semi-cylindrical portions 53 and 53 are abutted against each other, the filtration element 51 is wound around the outer periphery of the element holder 50 and set at the assembly position. You. In the set state, the plurality of element support pieces 54 flatly support the back side of the filtration element 51 (the surface facing the inner surface of the second case half 5S). When the pair of holder halves 50A, 50B are closed, the engagement hooks 59, 59 engage with the hook holes 60, 60, and the element holder 50 is held at the closed position.
[0028]
[Hose 8]
The hose 8 is formed of a flexible tube such as a vinyl tube, and the lower end thereof is connected to the airstone 9 and the upper end thereof is connected to a joint 62 for connecting the air pump Pu. The hose 8 penetrates the drain pipe 7 and is inserted into the suction passage 10 of the filtration element unit 6. The upper end is extended out of the water tank 1 and connected to the air pump Pu.
[0029]
The filtering device F can perform maintenance such as cleaning and replacement of the filtering element 51 without almost immersing the hands in the water in the water tank 1.
[0030]
Hereinafter, mainly with reference to FIGS. 18 to 20, the second case half 5 </ b> S is connected to the first case half 5 </ b> F attached to the water tank 1 by the suction cup 3 from above the water surface of the water tank 1. The following describes the procedure.
[0031]
(1) A new or cleaned filter element unit 6 is installed in the receiving portion 36 between the rotation locking portion 23 and the top plate 33 of the second case half 5S, and the hose penetrates the drain pipe 7. 8 is inserted together with the airstone 9 into the suction passage 10 of the filtration element unit 6, and the drain pipe 7 is rotatably fitted into the sector-shaped recess 34 of the second case half 5S.
[0032]
{Circle around (2)} Next, as shown in FIG. 18, the lower end of the second case half 5S to which the suction hose 8 and the drain pipe 7 are assembled is attached to the first case half 5F above the water surface of the water tank 1. 18, the pair of guide projections 30 at the lower end of the second case half 5S are engaged with the upper ends of the guide grooves 26 on both sides of the first case half 5F. When holding the drain pipe 7 as shown by the arrow Y and pressing the second case half 5S downward while inclining outwardly with respect to the first case half 5F, a pair of guide projections 30, 30 slides down while being guided by the pair of guide grooves 26, 26. Thereby, the position of the second case half 5S in the lateral direction with respect to the first case half 5F is regulated.
[0033]
(3) Next, as shown in FIG. 19, when the first case half 5F descends and comes near the assembling position, the pair of insertion tongue pieces 24, 24 are moved to the first case half 5F. As shown in the arrow X in FIG. 19, the second case half 5S is inserted into the pair of locking grooves 28, 28 of the locking receiving portion 18 with the engaging portion as a fulcrum. Of the first case half 5F, the plurality of left and right engagement protrusions 31, 31 of the first case half 5F are respectively engaged with the locking holes 27, 27 of the second case half 5S. Engagement (see FIG. 5), the rotation engagement portion 23 of the second case half 5S abuts on the locking receiving portion 18 of the first case half 5F, and the vertical position of both is regulated. After the assembly of the two case halves 5F and 5S is completed, the filtering device F is attached to a predetermined position in the water tank 1 as shown in FIGS.
[0034]
When maintenance such as cleaning and replacement of the filtration element 51 is required by using the filtration device F, the above operations (1) to (3) may be performed in reverse.
[0035]
Next, a second embodiment of the present invention will be described with reference to FIGS. 21 and 22. FIG. 21 is a perspective view of a water tank provided with the filtering device of the present invention, and FIG. 22 is a cross-sectional view of the filtering device. In the drawings, the same elements as those in the first embodiment are denoted by the same reference numerals.
[0036]
The second embodiment is a case where a bottom filtration device F ′ is connected to the internal filtration device F according to the present invention, and the air suction port 71 of a conventionally known bottom filtration device 70 laid on the bottom surface of the water tank 1 is connected. , Through the telescopic connecting pipe 72 and the L-shaped connecting pipe 73 to communicate with the suction passage 10 of the filtration case 5.
[0037]
The bottom filter F ′ is buried in a gravel 74 such as Oiso laid on the bottom of the water tank 1.
[0038]
In the second embodiment, by operating the air pump Pu, unpurified water in the water tank 1 can be suctioned and purified into the internal filter device F as in the first embodiment, and can be purified through the gravel 74. It can also be sucked into F ', and can be purified from the bottom using the gravel 74 as a filter medium.
[0039]
Thus, the second embodiment has the same operation and effect as those of the first embodiment.
[0040]
Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments are possible within the scope of the present invention.
[0041]
For example, in the above-described embodiment, an air pump is used as power for sucking water into the filtration device F, but a water pump may be used.
[0042]
【The invention's effect】
As described above, according to the invention described in the claims, when performing maintenance such as cleaning and replacement of the filtration element of the filtration element unit, the first case half is left in the water tank, and A person can easily assemble or remove the second case half in which the filter element unit is installed from the first case half without putting the hand in the water in the water tank deeply. The element replacement operation can be performed very simply and easily, and the water in the water tank is not contaminated by hand.
[Brief description of the drawings]
FIG. 1 is a perspective view when a filtration device is installed in a water tank (first embodiment).
FIG. 2 is a partially cutaway front view of the filtration device as viewed in the direction of arrow 2 in FIG. 1; FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2; FIG. 5 is a sectional view taken along line 5-5 in FIG. 2 FIG. 6 is a sectional view taken along line 6-6 in FIG. 4 FIG. 7 is an exploded sectional view taken along line 7-7 in FIG. FIG. 8 is a front view of the first half of the case. FIG. 9 is a cross-sectional view of the filtration case taken along line 9-9 in FIG. 10. FIG. 10 is a bottom view of the filtration case taken along arrow 10 in FIG. Sectional view when disassembled and assembled into a filter case. [FIG. 12] Partially broken front view of the filter element unit. [FIG. 13] Cross-sectional view showing the open / close state of the filter element unit along line 13-13 in FIG. FIG. 15 is a side view of the element holder. FIG. 15 is a front view of the element holder as viewed from arrow 15 in FIG. 14. FIG. 16 is a view of the element holder as viewed from arrow 16 in FIG. FIG. 17 is a perspective view showing an assembling sequence of the filtration element unit. FIG. 18 is a view showing an assembling procedure of the filtration case. FIG. 19 is a view showing an assembling procedure of the filtration case. FIG. 20 is 20-20 in FIG. FIG. 21 is a perspective view of a water tank provided with the filtration device of the present invention (second embodiment).
FIG. 22 is a cross-sectional view of a filtration device.
1 ... water tank 5 ... filtration case 5F ... first case half 5S ... second case half 6 ··········· Filtration element unit 7 ·········· Drain pipe 10 ············································· ····· Rotating engagement part 26 ······ Guide groove 27 ······ Locking hole 30 ······· Guide protrusion 31 ······· Engagement protrusion 36 ····· Reception part (of filtration element)
50 ... Element holder 51 ... Filter element 52 ... Hinge piece 53 ... Semi-circular portion Pu ... Water pump (air pump)

Claims (3)

A filter case (5) extending in the vertical direction and installed in the water tank (1), a filter element unit (6) detachably provided in the filter case (5), and a filter element unit (6) A drain pipe (7) detachably connected to the upper end of the suction passage (10) formed in the suction passage (10), and a water tank formed by a rising water flow generated in the suction passage (10) by a pump (Pu). The unpurified water in (1) is sucked into the filtration case (5) and purified by passing through the filtration element unit (6), and then purified through the suction passage (10) and the drain pipe (7). In the internal filtration device, which is to be refluxed in
The filtration case (5) is composed of first and second case halves (5F, 5S) that can be separated and combined with each other, and the first case half (5F) is a wall of a water tank (1). A guide groove (26) extending vertically is formed on both left and right side edges thereof, a plurality of locking holes (27) are formed, and a locking receiving portion (18) is formed on the bottom thereof. And
On the other hand, the second case half (5S) is formed with a receiving portion (36) for receiving the filtering element unit (6), and guides slidingly engaged with the guide grooves (26) at both lower edges thereof. A projection (30) is protruded, and an engagement projection (31) to be engaged with the locking hole (27) is protruded on both side edges thereof, and further, the bottom thereof is provided with the locking receiving portion (18). A pivotally engaging portion (23) that is rotatably received is formed,
While the first case half (5F) is mounted in the water tank (1), the second case half (5S) receiving the filter element unit (6) from above the water tank (1) can be connected. An internal filtration device, characterized in that: The said drainage pipe (7) was used for taking at the time of joining a 2nd case half (5S) to a 1st case half (5F), The said claim characterized by the above-mentioned. 2. The internal filtration device according to 1. The filtration element unit (6) includes an element holder (50) and a filtration element (51) wound around the outer periphery of the element holder (50). The element holder (50) is connected to a pair of hinge pieces (52) so as to be openable and closable. The element holder (50) is characterized in that, after the filter element (51) is mounted in the open state, the filter element (51) is closed in the closed state, so that the filter element (51) is wound around the outer periphery thereof and held. The internal filtration device according to claim 1 or 2, wherein

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