JP6454633B2 - Aquarium filter - Google Patents

Description

  The present invention relates to an aquarium filter installed in an aquarium tank used for viewing while raising and cultivating tropical fish, aquatic plants and the like in ordinary households.

  In general households, when ornamental fish such as tropical fish and ornamental plants (decorative plants) such as aquatic plants are bred and cultivated using ornamental aquariums, water quality deteriorates periodically or in order to ensure a good breeding environment. It is necessary to change the water in the aquarium. In order to discharge the water in the water tank when such a water tank is replaced, generally, a commercially available general-purpose hose (tube) or a water tank cleaning hose (tube) is used. For example, when using a commercially available general-purpose hose, immerse one end of the hose in water in the aquarium and place the other end in a drainage point (such as a drain outlet or a bucket) outside the aquarium, The water in the water tank sucked from one end of the hose is discharged to the drainage point through the hose. In addition, as for the water tank cleaning hose, there are well-known ones equipped with a manual pump for invoking a siphon phenomenon and those equipped with an electric pump for flowing water by electric power. In any water tank cleaning hose, water sucked from one end side (suction port) is discharged from the other end side (discharge port).

  On the other hand, Patent Documents 1 and 2 below disclose an overflow drainage device dedicated to a water tank installed in an ornamental water tank. This drainage device has an inverted U-shaped pipe, one end side (suction port) is installed in the water along the inner wall surface of the aquarium, and the upper bent portion is arranged so as to straddle the upper end of the aquarium wall. The other end side (discharge port) is installed outside along the water tank outer wall surface. Furthermore, a manual pump for priming is attached to the upper end of the pipe. And by operating a manual pump and priming water into a pipe to activate a siphon phenomenon, the water sucked from the suction port is discharged from the discharge port of the pipe.

Patent No. 4344000 JP 2007-236315 A

  However, when draining the water in the aquarium using a commercially available general-purpose hose or aquarium cleaning hose, the end of the hose is relatively placed in the aquarium so that the end of the hose is surely placed below the water surface. Since it is customary to throw it in deeper places, draw in pebbles, gravel, sand, etc. on the bottom of the aquarium and decorative parts such as aquatic plants and artificial plants installed in the aquarium with water. There was a risk of discharging. Then, since the layout in the aquarium collapses and changes, there is a problem that it is necessary to readjust the layout in the aquarium after draining (after water change), which makes it difficult to perform drainage treatment. Furthermore, when draining with a general-purpose hose, it is necessary to perform complicated operations such as priming when activating the siphon phenomenon, and there is also a problem that drainage treatment becomes difficult in this respect.

  Moreover, since the overflow type drainage apparatus only for a water tank is attached to the wall part of a water tank, it is necessary to ensure the new installation space for attaching a water drainage apparatus to a water tank. For this reason, for example, when other devices such as a filter, a lighting device, and a heater are installed in the water tank, it is difficult to secure a new mounting space for mounting the drainage device. In other words, when a drainage mechanism is installed in addition to other equipment, there is a problem that the surroundings of the water tank have a complicated structure, which is not preferable from an aesthetic point of view.

  The present invention has been made in view of the above-described problems, and can be used for water tanks that can easily perform wastewater treatment and can have a simple structure around the water tank without substantially requiring a space for installing a drainage mechanism. The purpose is to provide a filter.

  In order to achieve the above object, the present invention has the following structure.

[1] A filter casing that is supported by a water tank and in which a filter medium is accommodated, a circulation channel in which water flows from the water tank into the filter casing and returns to the water tank through the filter casing, and the circulation flow A water tank filter provided with a circulation pump installed on a road, wherein water flows along the circulation flow path by driving the circulation pump,
A flow path switching means is provided downstream of the circulation pump in the circulation flow path,
The flow path switching means has an inlet and a circulation outlet arranged corresponding to the circulation flow path, and a drain outlet arranged at a position separated from the circulation flow path at a position other than underwater. ,
The flow path switching means is configured to circulate the water flowing in from the inflow port from the circulation outlet and circulate along the circulation flow path, and to discharge the water flowing in from the inflow port from the drain outlet. The aquarium filter is configured to be switchable between a drainage state and a drainage state.

  [2] The aquarium filter according to [1], wherein a drain outlet of the flow path switching unit is disposed on a water surface of the filter casing or a water surface of the aquarium.

[3] When the flow path from the circulation flow path until the water in the water tank reaches the filter casing is the introduction flow path,
3. The water tank filter according to claim 1 or 2, wherein the flow path switching means is disposed at a downstream end of the introduction flow path.

  [4] The aquarium filter according to any one of items 1 to 3, wherein a pipe-shaped joint capable of connecting an end of a drainage hose is provided at a drainage outlet of the flow path switching unit.

[5] A hooking piece is provided on the filter casing,
The water tank filter according to any one of the preceding items 1 to 4, wherein the filter casing is disposed along the outer wall surface or the inner wall surface of the water tank by the hook piece being hooked on the wall of the water tank. .

[6] An introduction pipe having one end disposed below the water surface of the aquarium and the other end disposed in the filter casing,
6. The water tank filter according to claim 5, wherein a suction port of the circulation pump is connected to the other end of the introduction pipe, and an inlet of the flow path switching unit is connected to a discharge port of the circulation pump.

  [7] The aquarium filter according to any one of items 1 to 4, wherein the filter casing is attached to an aspect of being placed on an upper end of the aquarium.

[8] An introduction pipe having one end arranged in the water tank and the other end arranged in the filter casing,
A discharge port of the circulation pump is connected to one end of the introduction pipe, and at least a suction port of the circulation pump is disposed below the water surface of the water tank,
8. The aquarium filter according to item 7, wherein an inlet of the flow path switching unit is connected to the other end of the introduction pipe.

  According to the water tank filter of the invention [1], the water in the water tank can be easily discharged from the drain outlet of the flow path switching means simply by switching the flow path switching means. Furthermore, since only the flow path switching means is attached on the circulation flow path, it is not necessary to attach a drainage device or the like dedicated to drainage, and accordingly, the periphery of the water tank can be finished in a simple structure.

  According to the water tank filter of the invention [2], the water discharged from the discharge outlet of the flow path switching means is collected in the filter casing or the water tank even if it apologizes during the filtration process and switches to the waste water treatment. Therefore, it is possible to reliably prevent a problem that water is scattered outside the water tank.

  According to the water tank filter of the invention [3], since the flow path from the circulation pump to the flow path switching means can be constituted by a closed pipe, water can be efficiently and smoothly discharged by the driving force of the circulation pump. it can.

  According to the water tank filter of the invention [4], the drainage hose can be easily and reliably connected to the drainage outlet of the flow path switching means, so that water can be easily and reliably passed through the drainage hose during drainage. Can be discharged.

  According to the inventions [5] and [6], it is possible to provide a water tank filter that is hooked on the water tank wall.

  According to the water tank filter of the inventions [7] and [8], it is possible to provide an upper tank type water tank filter that is mounted so as to be placed on the upper end of the water tank.

FIG. 1 is a perspective view showing a water tank filter according to a first embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the vicinity of the filter medium in the water tank filter of the first embodiment. FIG. 3 is a side cross-sectional view showing the periphery of the flow path switching pipe in the aquarium filter of the first embodiment. FIG. 4 is a perspective view showing a flow path switching pipe applied to the aquarium filter of the first embodiment. FIG. 5 is an exploded perspective view showing the flow path switching pipe of the first embodiment. 6A and 6B are schematic cross-sectional views showing the flow path switching pipe of the first embodiment, in which FIG. 6A is a schematic cross-sectional view in a circulating state, and FIG. 6B is a schematic cross-sectional view in a drained state. FIG. 7 is a perspective view showing a water tank filter according to a second embodiment of the present invention. FIG. 8 is a schematic sectional view showing a flow path switching pipe applied to the aquarium filter of the second embodiment. FIG. 8A is a schematic sectional view in a circulating state, and FIG. It is a schematic sectional drawing. FIG. 9 is a perspective view showing a water tank filter according to a third embodiment of the present invention. FIG. 10 is a front sectional view showing a water tank filter according to a third embodiment. 11 is a front sectional view showing a water tank filter according to a third embodiment of the present invention. FIG. 12 is a schematic cross-sectional view showing a flow path switching pipe of a first modified example applicable to the aquarium filter of the present invention. FIG. 12 (a) is a schematic cross-sectional view in a circulating state, and FIG. It is a schematic sectional drawing in a state. FIG. 13 is a schematic cross-sectional view showing a flow path switching pipe of a second modified example applicable to the aquarium filter of the present invention. FIG. 13 (a) is a schematic cross-sectional view in a circulating state, and FIG. It is a schematic sectional drawing in a state. FIG. 14 is a schematic cross-sectional view showing a flow path switching pipe of a third modified example applicable to the aquarium filter of the present invention. FIG. 14 (a) is a schematic cross-sectional view in a circulating state, and FIG. It is a schematic sectional drawing in a state. FIG. 15 is a schematic sectional view showing a flow path switching pipe of a fourth modified example applicable to the aquarium filter of the present invention. FIG. 15 (a) is a schematic sectional view in a circulating state, and FIG. It is a schematic sectional drawing in a state. FIG. 16 is a schematic view showing a flow path switching pipe of a fifth modification applicable to the aquarium filter of the present invention.

<First Embodiment>
FIG. 1 is a perspective view showing a water tank filter F1 according to a first embodiment of the present invention. As shown in the figure, the aquarium filter F1 is a so-called outer filter that is supported on the side wall of the aquarium tank A.

  This filter F1 includes a filter casing 1 disposed along the outer wall surface of the upper end of the peripheral side wall of the ornamental fish tank A, an electric circulation pump 2 installed in the filter casing 1, and water in the tank A. Are introduced into the filter casing 1 and a flow path switching pipe P1 as flow path switching means is provided as basic components.

  The filter casing 1 has a substantially box shape with an open upper end, and is formed in a substantially rectangular shape in plan view.

  FIG. 2 is a side sectional view showing the vicinity of the filter medium in the water tank filter F1. As shown in FIGS. 1 and 2, a notch 11 is formed at the upper edge of the side wall (back wall) corresponding to the water tank A among the peripheral side walls of the filter casing 1. Further, a latching piece 12 is formed integrally with the cutout edge portion of the cutout portion 11 so as to protrude toward the water tank A and bend downward.

  And the latching piece 12 is latched by the upper end edge of the one side wall of the water tank A, The filter casing 1 is supported by the one side wall of the water tank A, and follows the outer surface (outer wall surface) of the one side wall upper end part of the water tank A. Are arranged.

  A filter medium 15 is disposed in the filter casing 1 corresponding to the notch 11. Then, as will be described later, the water W in the water tank A pumped into the filter casing 1 by the circulation pump 2 passes through the filter medium 15 and is filtered, and then overflows from the notch 11 and returns to the water tank A. It is like that.

  FIG. 3 is a side sectional view showing the periphery of the flow path switching pipe in the aquarium filter F1. As shown in FIG. 1 and FIG. 3, the introduction pipe 3 has an inverted U shape or a downward U shape, and the folded portion at the upper end crosses one side wall of the water tank A and the back wall of the filter casing 1. Are arranged as follows. One end opening (introduction port) of the introduction pipe 3 is disposed below the water surface of the water tank A, and the other end opening (outlet port) is disposed inside the filter casing 1.

  An electric circulation pump 2 is disposed in the filter casing 1. The suction port 21 of the circulation pump 2 is connected and fixed to the other end opening (outlet port) of the introduction pipe 3. When the circulation pump 2 is driven, the suction port 21 becomes negative pressure and the inside of the introduction pipe 3 also becomes negative pressure. As a result, the water W in the water tank A is sucked into the introduction pipe 3 from its one end opening (inlet), and the water W is sucked into the circulation pump 2 from the suction port 21 and discharged from the discharge port 22. It has become.

  4 is a perspective view showing a flow path switching pipe P1 applied to the aquarium filter F1, FIG. 5 is an exploded perspective view showing the flow path switching pipe P1, and FIG. 6 is a schematic sectional view showing the flow path switching pipe P1. It is. As shown in FIGS. 4 to 6, the flow path switching pipe P <b> 1 connected and fixed to the discharge port 22 of the circulation pump P <b> 1 has a double pipe structure including an outer pipe 41 and an inner pipe 51.

  Both ends of the outer pipe 41 are opened, and a pipe-shaped joint 421 is attached to one end opening so as to protrude outward along the axial direction. In the present embodiment, the pipe hole of the pipe-shaped joint 421 and one end opening of the outer pipe constitute an inflow port 42 that communicates between the inside and outside of the outer pipe 41.

  Pipe joints 431 and 441 are attached to the peripheral wall of the outer pipe 41 so as to be aligned in the axial direction and protrude outward in the radial direction. A through hole is formed in the peripheral wall of the outer pipe 41 corresponding to each pipe hole of the pipe-shaped joints 431 and 441. In this embodiment, the pipe hole of the pipe-shaped joint 431 and the one through-hole constitute the circulation outlet 43 that communicates between the inside and outside of the outer pipe 41, and the pipe hole of the pipe-shaped joint 441 and the other through-hole. A drainage outlet 44 that communicates between the inside and outside of the outer pipe 41 is constituted by the hole.

  The pipe-shaped joints 421, 431, and 441 are only required to be attached at necessary places, and may be attached only to the drain outlet 44, for example. Furthermore, if the pipe-shaped joints 421, 431, and 441 are formed so that the diameter dimension gradually decreases toward the tip, a plurality of types of pipes and hoses with different pipe diameters can be reliably connected. .

  One end of the inner pipe 51 is opened, and a large-diameter operation portion 56 is attached to the other end side. The other end side of the inner pipe 51 is closed by the operation unit 56. A circulation opening 53 and a drain opening 54 are formed in the peripheral wall of the inner pipe 51 so as to penetrate the peripheral wall. The circulation opening 53 and the drainage opening 54 correspond to the circulation outlet 43 and the drainage outlet 44 of the outer pipe 41, respectively, and both the openings 53 and 54 are arranged 180 degrees out of phase with each other.

  A watertight O-ring 55 is wound around one end of the circulation opening 53 in the inner pipe 51, between the openings 53 and 54, and the other end of the drainage opening 54.

  The inner pipe 51 is inserted and arranged in the outer pipe 41 so as to be rotatable in the circumferential direction (axial direction) with respect to the outer pipe 41 to form a flow path switching pipe P1.

  In this flow path switching pipe P1, the inlet 42 of the outer pipe 41 is disposed corresponding to one end opening of the inner pipe 51, and the inside of the inner pipe 51 is exposed to the outside via this inlet 42 and one end opening. It is communicated.

  Further, in the present embodiment, the inner pipe 51 in the flow path switching pipe P1 is rotated by pinching the operation portion 56, so that the circulation opening 53 of the inner pipe 51 corresponds to the circulation outlet 43 of the outer pipe 41. And a state where the drain outlet 44 of the outer pipe 51 is closed by the peripheral wall of the inner pipe 51 (circulation state), and the circulation outlet 43 of the outer pipe 41 is closed by the peripheral wall of the inner pipe 51, and the inner pipe It is configured to be switchable between a state (drainage state) in which the drainage opening 54 of 51 is arranged corresponding to the drainage outlet 44 of the outer pipe 41.

  In the circulation state in the flow path switching pipe P <b> 1 having this configuration, when water W flows from the inlet 42 of the outer pipe 41, the water W flows into the inner pipe 51 and also flows into the inner pipe 51. The water W flows out to the outside through the circulation opening 53 and the circulation outlet 43. Further, in the drained state, the water W that has flowed into the inner pipe 51 from the inlet 42 of the outer pipe 41 is discharged to the outside through the drain opening 54 and the drain outlet 44.

  As shown in FIGS. 1 and 3, the inlet 42 in the flow path switching pipe P <b> 1 having this configuration is connected and fixed to the discharge port 22 of the circulation pump 2 in the filter casing 1. In this connected state, the flow path switching pipe P1 is arranged vertically so that one end side (inlet 42 side) is located below and the other end side (operation unit 56 side) is located above.

  Further, in this state, the drain outlet 44 is disposed above the circulation outlet 43. Further, the drain outlet 44 is disposed in the filter casing 1 in plan view. Further, in a state where the water W is stored in the filter casing 1, the drain outlet 44 is disposed above the water surface. In other words, the drain outlet 44 is disposed at a position other than underwater.

  The circulation outlet 43 in the flow path switching pipe P1 only needs to be disposed in the filter casing 1 in plan view. For example, the circulation outlet 43 may be disposed in water or may be disposed on the water surface.

  In the aquarium filter F1 of the present embodiment, a cover member that covers the upper end opening of the filter casing 1 may be detachably attached.

  In the aquarium filter F1 of the present embodiment configured as described above, in addition to the original function of filtering the water W in the aquarium A, the aquarium A is used when water is changed during cleaning or maintenance inspection of the aquarium A. It also has a function of draining the water W inside.

  First, when performing a normal filtration process, the operation part 56 of the flow path switching pipe P1 is operated to set the circulation state as necessary, the circulation outlet 43 of the flow path switching pipe P1 is opened, and The drain outlet 44 is closed. In this state, the circulation pump 2 is driven.

  Thereby, the water W in the water tank A is sucked from the introduction pipe 3 and sucked from the suction port 21 of the circulation pump 2. The water W sucked into the circulation pump 2 is discharged from the discharge port 22 and flows into the flow path switching pipe P1 from the inflow port. The water W flowing into the flow path switching pipe P1 is discharged from the circulation outlet 43 and flows into the filter casing 1. The water W that has flowed into the filter casing 1 passes through the filter medium 15 and is filtered, then overflows the notch 11 of the filter casing 1, circulates on the hooking piece 12, and returns to the water tank A.

  Thus, the water W in the water tank A is introduced into the filter casing 1, passes through the filter medium 15, and then circulates back into the water tank A, whereby the water W in the water tank A is filtered.

  Here, in this embodiment, the part from the inlet 42 of the introduction pipe 3, the circulation pump 2, and the flow path switching pipe P1 to the outlet 43 for circulation, the filter casing 1, the filter medium 15, the notch 11, and the latching piece 12 are used. A circulation flow path is formed by the upper surface of. Furthermore, an introduction flow path of the circulation flow path is configured by the portions from the inlet 42 to the circulation outlet 43 of the introduction pipe 3, the circulation pump 2, and the flow path switching pipe P1. Further, a return flow path is constituted by the upper surface of the notch 11 and the latching piece 12. Therefore, in this embodiment, the flow path switching pipe P1 as the flow path switching means is provided downstream of the circulation pump 2 in the circulation flow path. Further, the inlet 42 and the circulation outlet 43 of the flow path switching pipe P1 are disposed corresponding to the circulation flow path, and the drain outlet 44 is disposed at a position separated from the circulation outlet 43 (circulation flow path). ing.

  On the other hand, when drainage treatment is performed, the operation unit 56 of the flow path switching pipe P1 is operated to set the drainage state as necessary, the drainage outlet 44 of the flow path switching pipe P1 is opened, and the circulation is performed. The outlet 43 is closed. Further, one end of a drainage hose (not shown) is connected to the pipe-shaped joint 441 of the drainage outlet 44 of the flow path switching pipe P1, and the other end of the drainage hose is disposed at a predetermined drainage location such as a bucket. In this state, the circulation pump 2 is driven. Needless to say, the flow path switching pipe P1 may be operated to switch from the filtered state to the drained state while the circulation pump 2 is driven.

  In this drained state, the water W in the water tank A is sucked from the introduction pipe 3 and sucked from the suction port 21 of the circulation pump 2. The water W sucked into the circulation pump 2 is discharged from the discharge port 22 and flows into the flow path switching pipe P1 from the inflow port. The water W flowing into the flow path switching pipe P1 is discharged from the drain outlet 44 and discharged to a predetermined drainage location such as a bucket via the drain hose. Thus, after discharging a predetermined amount of water W, water can be changed by newly supplying a predetermined amount of water W.

  Thus, in the aquarium filter F1 of the present embodiment, the water W in the aquarium A can be easily and smoothly simply by performing a one-touch operation of switching the flow path switching pipe P1 during drainage such as when changing water. Can be discharged.

  Furthermore, at the time of this drainage, the water W in the water tank A is sucked from the introduction pipe 3 previously installed in the water tank A. In other words, the introduction pipe 3 is set in advance to a position where a covering material such as pebbles, gravel, and sand laid in the water tank A, and decorative parts such as artificial plants installed in the water tank A are not sucked. Further, a strainer or the like for preventing foreign matter from being sucked in is attached to the lower end of the introduction pipe 3. For this reason, according to the aquarium filter F1 of this embodiment, it is possible to reliably prevent a problem that the layout material and decorative parts are sucked and discharged together with water during drainage, and the layout is destroyed. Later, the troublesome work of readjusting the layout is unnecessary, and the waste water treatment can be performed more easily.

  Further, in the aquarium filter F1 of the present embodiment, the water W in the aquarium A is sucked and discharged from the lower end of the introduction pipe 3 at the time of drainage, so that the water level in the aquarium A is higher than the lower end of the introduction pipe 3. When it becomes low, further drainage can be prevented. In other words, it is possible to prevent the water W from being discharged more than necessary, and the discharge amount of the water W, and thus the replacement amount, can be appropriately maintained, and the breeding and cultivation environment in the water tank A can be favorably maintained.

  Further, in the aquarium filter F1 of the present embodiment, since a drainage mechanism is added by attaching a flow path switching pipe P1 or the like to a conventional filter (filtering device), a conventional drainage device (drainage mechanism) dedicated to drainage. Compared to the case of assembling, there is no need to secure a space for installing a drainage mechanism around the water tank. Accordingly, it is possible to save space and to simply finish the structure around the water tank, and to obtain a good aesthetic appearance as the whole water tank.

  In the present embodiment, since the drain outlet 44 of the flow path switching pipe P1 is disposed on the water surface of the filter casing 1, the user apologizes during the filtration process and switches to the drained state to flow the water W through the flow path. Even if the water is discharged from the drain outlet 44 of the switching pipe P1, the water W discharged from the drain outlet 44 is collected in the filter casing 1. For this reason, the malfunction that the water W will be scattered outside the water tank A can be prevented reliably.

  In the aquarium filter F1 of the first embodiment, the discharge port 22 of the circulation pump 2 is connected to the inlet 41 of the flow path switching pipe P1 by a closed pipe. Thus, the water W can be discharged efficiently and smoothly.

  In this embodiment, since the pipe joint 441 is attached to the drain outlet 44 of the flow path switching pipe P1 (see FIGS. 4 and 5), the drain is discharged to the drain outlet 44 via the pipe joint 441. A hose etc. can be connected easily and reliably, and the convenience can be improved.

  Further, since the pipe-shaped joints 421 and 431 are also attached to the inlet 42 and the circulation outlet 43 of the flow path switching pipe P1 (see FIGS. 4 and 5), the pipe-shaped joints 421 and 431 are used as described above. Hose and pipe can be connected easily and securely.

Second Embodiment
FIG. 7 is a perspective view showing a water tank filter F2 according to a second embodiment of the present invention. As shown in the figure, this aquarium filter F2 is greatly different from the aquarium filter F1 of the first embodiment in that the circulation pump 2 is disposed inside the aquarium A outside the filter casing 1. It is.

  In other words, in the water tank filter F2, the flow path switching pipe P2 is vertically arranged inside the water tank A along the inner wall surface.

  As shown in FIGS. 7 and 8, the flow path switching pipe P2 used in the second embodiment is shifted in phase by 180 ° at the circulation outlet 43 and the drainage outlet 44 of the outer pipe 41 at substantially the same height position. It is arranged at the position. Further, the inner pipe 51 is formed with one opening 52 serving as both a circulation opening and a drainage opening corresponding to the circulation outlet 43 and the drainage outlet 44 of the outer pipe 41.

  The inner pipe 51 is accommodated in the outer pipe 41 so as to be rotatable in the direction around the axis (circumferential direction) to form a flow path switching pipe P2. In the flow path switching pipe P2, the opening 52 of the inner pipe 51 is arranged corresponding to the circulation outlet 43 of the outer pipe 51 by pinching and rotating the operation portion 56 (switching operation). In a state where the drainage outlet 44 of the outer pipe 51 is closed by the peripheral wall 51, the inflow port 42 is in a circulation state communicating with the circulation outlet 43. In addition, when the opening 52 of the inner pipe 51 is arranged to correspond to the drain outlet 44 of the outer pipe 51 by the switching operation, and the circulation outlet 43 of the outer pipe 51 is closed by the peripheral wall of the inner pipe 51, the inlet 42 is The drainage state communicates with the drainage outlet 44.

  As shown in FIG. 7, the upper end of the first introduction pipe 31 arranged vertically is connected to the inlet 42 of the flow path switching pipe P2, and the lower end of the first introduction pipe 31 is arranged in the water. Yes. Furthermore, one end (inlet) of the inverted L-shaped second introduction pipe 32 is connected to the circulation outlet 43 of the flow path switching pipe P2, and the other end (outlet) of the second introduction pipe 32 is connected to the circulation outlet 43. Arranged in the filter casing 1.

  Further, the discharge port 22 of the electric circulation pump 2 disposed in the water of the water tank A is connected and fixed to the lower end of the first introduction pipe 31. Therefore, the discharge port 22 of the circulation pump 2 is connected to the inflow port 42 of the flow path switching pipe P2 through the first introduction pipe 31.

  In the second embodiment, the drain outlet 44 of the flow path switching pipe P2 is disposed on the water surface of the water tank A, that is, at a position other than underwater.

  The other configuration of the aquarium filter F2 of the second embodiment is substantially the same as that of the aquarium filter F1 of the first embodiment. Therefore, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted. To do.

  In the water tank filter F2 of the second embodiment, in the circulating state (filtered state), the water W in the water tank sucked from the suction port 21 of the circulation pump 2 is discharged from the discharge port 22 of the circulation pump 2 and is first. It flows into the flow path switching pipe P <b> 2 from the inlet 42 through the introduction pipe 31. The water W that has flowed into the flow path switching pipe P2 is discharged from the circulation outlet 43, introduced into the second introduction pipe 32, and introduced into the filter casing 1. The water W introduced into the filter casing 1 passes through the filter medium 15 and then overflows the notch 11 and returns to the water tank A.

  Here, in the present embodiment, the circulation pump 2, the first introduction pipe 31, the portion from the inlet 42 to the circulation outlet 43 of the flow path switching pipe P2, the second introduction pipe 32, the filter casing 1, the filter medium 15, A circulation channel is formed by the upper surface of the notch 11 and the hooking piece 12. Further, the introduction flow path is constituted by the circulation flow path 2, the first introduction pipe 31, the flow path switching pipe P <b> 2, and the portions from the inlet 42 to the circulation outlet 43 of the second introduction pipe 32 in the circulation flow path. Therefore, in this embodiment, the flow path switching pipe P2 as the flow path switching means is provided downstream of the circulation pump 2 in the circulation flow path. Further, the inlet 42 and the circulation outlet 43 of the flow path switching pipe P1 are disposed corresponding to the circulation flow path, and the drain outlet 44 is disposed at a position separated from the circulation outlet 43 (circulation flow path). ing.

  On the other hand, in the drained state, the water W sucked from the circulation pump 2 is discharged from the drain outlet 44 through the first introduction pipe 31 and the flow path switching pipe P2, and is predetermined via a drain hose (not shown) or the like. Discharged into the drainage area.

  In the aquarium filter F2 of the second embodiment, the same effect as that of the aquarium filter F1 of the first embodiment can be obtained.

  Furthermore, in this water tank filter F2, since the drain outlet 44 of the flow path switching pipe P2 is disposed on the water surface of the water tank A, even if it apologizes during the filtration process and is switched to the drained state, the flow path Water W discharged from the drainage outlet 44 of the switching pipe P2 is returned to the water tank A. For this reason, similarly to the first embodiment, it is possible to reliably prevent a problem that the water W is scattered outside the water tank A.

<Third Embodiment>
FIG. 9 is a perspective view showing an aquarium filter F3 according to a third embodiment of the present invention, and FIG. 10 is a front sectional view showing the aquarium filter F3. As shown in both figures, the aquarium filter F3 is a so-called upper filter, which is an upper installation type filter that is mounted so as to be placed on the upper end of the ornamental fish tank A. This aquarium filter F3 includes a filter casing 1 that is supported on the upper end of the aquarium peripheral side wall so as to close the rear portion of the upper end opening in the aquarium A.

  A filter chamber 16 and a downstream chamber 17 are provided inside the filter casing 1, and a filter medium 15 is accommodated in the filter chamber 16. A water passage hole 181 is formed at the lower end of the partition wall 18 that partitions the filtration chamber 16 and the downstream chamber 17, and the water W in the filtration chamber 16 enters the downstream chamber 17 through the water passage hole 181. Inflow.

  Corresponding to the downstream chamber 17, the return pipe 13 is attached to the bottom wall of the filter casing 1 so as to penetrate vertically. The lower end of the return pipe 13 is disposed corresponding to the water surface of the water tank A. Thereby, when the water W in the downstream chamber 17 is stored in a predetermined amount or more, the water W overflows the upper end of the return pipe 13, flows into the return pipe 13, flows down the return pipe 13, and returns to the water tank A. It is like that.

  A straight introduction pipe 3 is attached to the bottom wall at the upstream end of the filter casing 1 in a penetrating state, and the upper end is disposed inside the filter casing 1.

  The discharge port 22 of the electric circulation pump 2 is connected and fixed to the lower end of the introduction pipe 3, and the whole including the suction port 21 of the circulation pump 2 is arranged in the water of the water tank A.

  The inlet 42 of the flow path switching pipe P3 is connected and fixed to the upper end of the introduction pipe 3. The flow path switching pipe P3 is arranged vertically, the circulation outlet 43 thereof is arranged corresponding to the filtration chamber 16, and the drainage outlet 44 is above the circulation outlet 43 on the water surface of the filtration chamber 16 ( It is placed at a position other than underwater).

  The flow path switching pipe P3 used in the third embodiment has substantially the same configuration as the flow path switching pipe P1 used in the first embodiment. That is, by appropriately operating the operation unit 56, a circulating state (filtered state) in which the water W that flows in from the inflow port 42 flows out from the circulation outlet 43, and the water W that flows in from the inflow port 42 flows into the drainage outlet 44. It is configured to be switchable between the drainage state that flows out from the tank.

  The other configuration of the aquarium filter F3 of the third embodiment is substantially the same as that of the aquarium filter F1, F2 of the above embodiment. To do.

  When normal filtration is performed in the water tank filter F3, the flow path switching pipe P3 may be set in a circulating state. Thus, the water W in the water tank A sucked from the suction port 21 of the circulation pump 2 is discharged from the discharge port 22 of the circulation pump 2 and introduced into the introduction pipe 3. The water W introduced into the introduction pipe 3 flows in from the inlet 42 of the flow path switching pipe P3 and flows out of the circulation outlet 43. Water W flowing out from the circulation outlet 43 is introduced into the filtration chamber 16, filtered through the filter medium 15, and then introduced into the downstream chamber 17 through the water passage hole 181 of the partition wall 18. The water W introduced into the downstream chamber 17 overflows and is introduced into the return pipe 13 from the upper end thereof, and returns to the water tank A through the return pipe 13. In this way, the water W is circulated between the water tank A and the filter F3 to sequentially filter the water W in the water tank A.

  Here, in the third embodiment, the part from the inlet 42 to the outlet 43 for circulation of the circulation pump 2, the introduction pipe 3, and the flow path switching pipe P3, the filter casing 1 (the filter medium 15, the filtration chamber 16, and the downstream chamber). 17) A circulation flow path is formed by the return pipe 13. Furthermore, the introduction flow path is formed by the portions from the inlet 42 to the circulation outlet 43 of the circulation pump 2, the introduction pipe 3, and the switching flow path pipe P3. Further, a return flow path is constituted by the return pipe 13. Therefore, in this embodiment, the flow path switching pipe P3 as the flow path switching means is provided downstream of the circulation pump 2 in the circulation flow path. Further, the inlet 42 and the circulation outlet 43 of the flow path switching pipe P1 are disposed corresponding to the circulation flow path, and the drain outlet 44 is disposed at a position separated from the circulation outlet 43 (circulation flow path). ing.

  On the other hand, when the waste water treatment is performed for water change or the like, the flow path switching pipe P3 may be set to the drained state. Thus, the water W in the water tank A sucked into the circulation pump 2 flows into the flow path switching pipe P3 through the introduction pipe 3 and is discharged from the drain outlet 44. The water W discharged from the drain outlet 44 is discharged to a predetermined drainage location such as a bucket via a drain hose (not shown) connected to the drain outlet 44.

  In the aquarium filter F3 of the third embodiment, as in the above embodiment, the water in the aquarium A can be easily discharged to a predetermined location simply by operating the flow path switching pipe P3 during drainage. Further, similarly to the above embodiment, the suction port 21 of the circulation pump 2 is arranged at a predetermined height position, and a strainer (not shown) is attached to the suction port 21, so that the laying material in the water tank A is drained. It is also possible to reliably prevent problems such as unintentionally sucking in decorative parts and destroying the layout.

  Furthermore, similarly to the above-described embodiment, it is possible to reliably prevent a problem that the water W is discharged more than necessary during drainage.

  Also in the third embodiment, as in the above embodiment, there is no need to separately provide a drainage device dedicated to drainage, space can be saved, and the configuration around the water tank can be simply finished.

  Furthermore, since the outlet 44 for drainage of the flow path switching pipe P3 is arranged on the water surface of the filtration chamber 16 of the filter casing 1 as in the above embodiment, the user apologizes and switches to the drainage state during the filtration process. Even if the water W is discharged from the drain outlet 44 of the flow path switching pipe P1, the water W discharged from the drain outlet 44 is collected in the filter casing 1, and the water W is disposed outside the water tank A or the like. Problems such as scattering can be reliably prevented.

  In particular, in the aquarium filter F3 of the third embodiment, the waste water treatment can be more easily performed. That is, the upper filter such as the water tank filter F3 of the third embodiment is disposed so as to close a part of the upper end opening of the water tank A. For this reason, the conventional upper filter is often a hindrance when performing wastewater treatment, and the upper filter itself may have to be removed to reliably perform the drainage work, which further complicates the wastewater treatment. .

  On the other hand, the aquarium filter F3 of this embodiment can be easily drained by simply switching the flow path switching pipe P3, and the troublesome work of removing the aquarium filter F3 when draining. No wastewater treatment is required, and wastewater treatment can be performed more easily and smoothly.

  Also in the aquarium filter F3 of the third embodiment, the discharge port 22 of the circulation pump 2 is connected to the inlet 41 of the flow path switching pipe P1 through a closed line, as in the first and second embodiments. Therefore, at the time of drainage, the water W can be efficiently and smoothly discharged by the driving force of the circulation pump 2.

  In the aquarium filter F3 of this embodiment, a cover member that covers the upper end opening of the filter casing 1 may be detachably attached.

<Fourth embodiment>
FIG. 11 is a front sectional view showing a water tank filter F4 according to a fourth embodiment of the present invention. As shown in the figure, this aquarium filter F4 is greatly different from the aquarium filter F3 of the third embodiment in that the flow path switching pipe P4 is attached to the lower end of the return pipe 13.

  That is, in the water tank filter F4 of the fourth embodiment, the lower end portion of the return pipe 13 is bent in the horizontal direction. The inlet 42 of the flow path switching pipe P4 is connected and fixed to the bent end opening of the return pipe 13, and the flow path switching pipe P4 is disposed horizontally. This flow path switching pipe P4 has substantially the same configuration as the flow path switching pipe P1 of the first embodiment. That is, when the circulation state is set, the water W flowing in from the inlet 42 of the flow path switching pipe P4 flows out from the circulation outlet 43, whereas when the drainage state is set, the water W is drained. The outlet 44 flows out.

  A discharge port 22 of the circulation pump 2 disposed in the water is connected and fixed to the lower end of the introduction pipe 3 disposed in a manner penetrating the bottom wall on the upstream side of the filter casing 1. Furthermore, the upper end portion of the introduction pipe 3 is bent in the horizontal direction, and the opening of the bent end portion is arranged corresponding to the filtration chamber 16 in the filter casing 1.

  In the aquarium filter F4 according to the fourth embodiment, other configurations are substantially the same as those of the aquarium filter F3 according to the third embodiment. To do.

  In the water tank filter F4 of the fourth embodiment, when the flow path switching pipe P4 is set in a circulation state (filtered state), the water W in the water tank A sucked from the circulation pump 2 is introduced into the introduction pipe. 3 flows into the filter chamber 16 of the filter casing 1. Further, the water W in the filtration chamber 16 flows into the downstream chamber 17, flows into the return pipe 13 due to overflow, and flows into the flow path switching pipe P4. The water W that has flowed into the flow path switching pipe P4 is returned from the circulation outlet 43 into the water tank A.

  Here, in the fourth embodiment, the circulation pump 2, the introduction pipe 3, the filter casing 1 (filter medium 15, filtration chamber 16, downstream chamber 17), return pipe 13 and circulation from the inlet 42 of the flow path switching pipe P3. A circulation channel is formed by the portion up to the outlet 43. Further, an introduction flow path is formed by the circulation pump 2 and the introduction pipe 3. Further, a return flow path is constituted by the portion from the inlet 42 to the circulation outlet 43 of the return pipe 13 and the switching flow path pipe P3. Therefore, in this embodiment, the flow path switching pipe P4 as the flow path switching means is provided downstream of the circulation pump 2 in the circulation flow path. Further, the inlet 42 and the circulation outlet 43 of the flow path switching pipe P1 are disposed corresponding to the circulation flow path, and the drain outlet 44 is disposed at a position separated from the circulation outlet 43 (circulation flow path). ing.

  On the other hand, when the flow path switching pipe P4 is set to the drainage state, the water W in the water tank A sucked from the circulation pump 2 is introduced into the introduction pipe 3, the filter chamber 16, the downstream chamber 17 and the return pipe 13 of the filter casing 1. Then, it flows into the flow path switching pipe P4 and is discharged from the drain outlet 44. The water W discharged from the drain outlet 44 is discharged to a predetermined drainage location such as a bucket via a drain hose (not shown) connected to the drain outlet 44.

  The aquarium filter F4 of the fourth embodiment also has the same effects as the third embodiment.

  In the aquarium filter F4 of the fourth embodiment, the drainage outlet 44 of the flow path switching pipe P4 is disposed on the water surface of the aquarium A, so that the water flowing out of the drainage outlet 44 due to a switching operation error or the like. W is recovered not in the filter casing 1 but in the water tank A.

<Modification>
In the present invention, the configuration of the flow path switching pipe as the flow path switching means is not limited to that of the above embodiment, and for example, the following flow path switching pipes P5 to P9 can be used.

  That is, in the flow path switching pipe P5 of the first modification shown in FIG. 12, the circulation outlet 43 and the drain outlet 44 are formed on the peripheral wall of the outer pipe 41 in the axial direction in the same manner as in the first embodiment. In addition, an inlet 42 is formed at the end of the outer pipe 41. An inner pipe 51 is inserted into the outer pipe 41 so as to be slidable in the axial direction. The inner pipe 51 has a single opening 52 for both circulation and drainage. In this flow path switching pipe P5, the inner pipe 51 is slid along the axial direction with respect to the outer pipe 41, and the opening 52 of the inner pipe 51 is formed in the outer pipe 41 as shown in FIG. Corresponding to the circulation outlet 43, the water W flowing in from the inflow port 42 flows out of the circulation outlet 43, and as shown in FIG. By making it correspond to the outlet 44 for drainage of the pipe 41, it can be switched between the drainage state in which the water W flowing in from the inlet 42 flows out from the outlet 44 for drainage.

  In the flow path switching pipe P5, the inner pipe 51 is simply slid in the axial direction with respect to the outer pipe 41. However, the present invention is not limited to this. For example, a male screw is formed on the outer peripheral surface of the inner pipe 51, and A female screw may be formed on the inner peripheral surface of the outer pipe 41, and the inner pipe 51 may be screwed into the outer pipe 41 for attachment. The inner pipe 51 may be slid in the axial direction by screwing (rotating) the outer pipe 41 so that the circulation outlet 43 and the drain outlet 44 can be appropriately opened and closed.

  Further, the flow path switching pipe P6 of the second modification shown in FIG. 13 is arranged on the peripheral wall of the pipe body 41 corresponding to the outer pipe in the axial direction in the same manner as in the first modification, and the circulation outlet 43 and the drainage pipe. An outlet 44 is formed, and an inlet 42 is formed at the end of the pipe body 41. A shaft member 61 is accommodated in the pipe body 41 so as to be rotatable about the axis along the axis. The shaft member 61 passes through the end blockage wall of the pipe body 41, the end of the shaft member 61 is disposed outside, and an operation portion 56 is provided at the outer end thereof. Further, the shaft member 61 is provided with a circulation outlet closing valve 63 capable of closing the circulation outlet 43 of the pipe body 41, and a drain outlet closing valve 64 capable of closing the drain outlet 44 is provided with the circulation outlet closed. The valve 63 is provided at a position shifted from the phase by 180 °. In this flow path switching pipe P6, the operating member 56 is pinched to rotate the shaft member 61 to shift the position of the circulation outlet closing valve 63 relative to the circulation outlet 43 as shown in FIG. A circulation state in which the water outlet W is introduced from the circulation outlet 43 by opening the circulation outlet 43 and closing the drainage outlet 44 by the drainage outlet closing valve 64; As shown in FIG. 5B, the circulation outlet 43 is closed by the circulation outlet closing valve 63, and the drain outlet 44 is opened by shifting the position of the drain outlet closing valve 64 with respect to the drain outlet 44. Thus, the water W flowing in from the inflow port 42 can be switched between the drained state in which the water W flows out from the draining outlet 44.

  Further, in the flow path switching pipe P7 of the third modified example shown in FIG. 14, the circulation outlet 43 and the drain outlet 44 have the same height on the peripheral wall of the pipe body 41 corresponding to the outer pipe, as in the second embodiment. At the position, the phase is shifted by 180 ° in the direction around the axis (circumferential direction), and an inlet 42 is formed at the end of the pipe body 41. A shaft member 61 is accommodated in the pipe body 41 so as to be rotatable around the axis. The shaft member 61 passes through the end blockage wall of the pipe body 41, the end of the shaft member 61 is disposed outside, and an operation portion 56 is provided at the outer end thereof. Further, the shaft member 61 is provided with one outlet closing valve 62 capable of closing the circulation outlet 43 and the drain outlet 44 of the pipe body 41. In this flow path switching pipe P7, the operating member 56 is pinched to rotate the shaft member 61, and the position of the outlet closing valve 62 is shifted with respect to the circulation outlet 43 as shown in FIG. The circulation state in which the water outlet 43 is opened and the drain outlet 44 is closed by the outlet closing valve 62 so that the water W flowing in from the inflow port 42 flows out of the circulation outlet 43 is shown in FIG. ), The circulation outlet 43 is closed by the outlet closing valve 62, and the outlet closing valve 62 is shifted with respect to the drain outlet 44 to open the drain outlet 44. It is configured to be switchable between a drainage state in which the water W is allowed to flow out from the drainage outlet 44.

  Further, the flow path switching pipe P8 of the fourth modified example shown in FIG. 15 has a circulation outlet 43 and a drain outlet 44 in the axial direction on the peripheral wall of the pipe body 41 corresponding to the outer pipe as in the first embodiment. The inlet 42 is formed at the end of the pipe body 41. A shaft member 61 is accommodated in the pipe body 41 so as to be slidable in the axial direction. The shaft member 61 passes through the end blockage wall of the pipe body 41, the end of the shaft member 61 is disposed outside, and an operation portion 56 is provided at the outer end thereof. Further, the shaft member 61 is provided with one outlet closing valve 62 capable of closing the circulation outlet 43 and the drain outlet 44 of the pipe body 41. In this flow path switching pipe P8, the operating member 56 is pinched to slide the shaft member 61, and the position of the outlet closing valve 62 is shifted with respect to the circulation outlet 43 as shown in FIG. The circulation state in which the water outlet 43 is opened and the drain outlet 44 is closed by the outlet closing valve 62 so that the water W flowing in from the inflow port 42 flows out of the circulation outlet 43 is shown in FIG. ), The circulation outlet 43 is closed by the outlet closing valve 62, and the outlet closing valve 62 is shifted with respect to the drain outlet 44 to open the drain outlet 44. It is configured to be switchable between a drainage state in which the water W is allowed to flow out from the drainage outlet 44.

  In the flow path switching pipe P8 of the fourth modified example, the shaft member 61 is simply slid in the axial direction with respect to the pipe body 41. However, the present invention is not limited to this, for example, the end of the pipe body 41 in the shaft member 61. A male screw is formed on the outer peripheral surface of the penetrating portion with respect to the portion blocking wall, and a female screw is formed on the inner peripheral surface of the through hole of the end closing wall of the pipe body 41 so that the shaft member 61 is screwed into the pipe main body 41 and attached. May be. The shaft member 61 may be slid in the axial direction by screwing (rotating) the pipe body 41 so that the circulation outlet 43 and the drain outlet 44 can be appropriately opened and closed.

  In addition, the flow path switching pipe P9 of the fifth modification shown in FIG. 16 has an inlet 42 at one end of the pipe body 41. Further, the other end of the pipe body 41 is bifurcated, a circulation outlet 43 is provided in one branch pipe, and a drain outlet 44 is formed in the other branch pipe. Further, a circulation outlet on / off valve 63 is attached to one branch pipe having the circulation outlet 43, and a drain outlet outlet on / off valve 64 is attached to the other branch pipe having the drain outlet 44. In the flow path switching pipe P9, the circulation outlet on / off valve 63 is opened and the drain outlet on / off valve 64 is closed to circulate the water W flowing in from the inflow port 42 through the circulation outlet 43. The state can be switched between a drainage state in which water W flowing in from the inflow port 42 flows out from the drainage outlet 44 by closing the circulation outlet on-off valve 63 and opening the drainage outlet on-off valve 64. It is configured.

  Further, in the present invention, the formation positions of the inlet 42, the circulation outlet 43, and the drain outlet 44 of the flow path switching pipe are not particularly limited. For example, the inlet is formed on the peripheral wall of the outer pipe. Alternatively, the circulation outlet and the drain outlet may be formed on the end blocking wall of the outer pipe. Furthermore, in the present invention, the relative positional relationship between the inlet, the circulation outlet, and the drain outlet is not particularly limited, and the inlet may be formed between the circulation outlet and the drain outlet. In addition, the drain outlet may be formed above the circulation outlet.

  Moreover, in the said embodiment, the case where this invention is applied to the outer filter F1 and F2 attached to the side wall of the water tank A, and the upper filter F3 and F4 attached so that it may mount in the upper part of the water tank A is used. Although described with an example, the present invention is not limited thereto, and the present invention can be applied to any filter as long as it is a water tank filter in which a filter casing is supported by the water tank A.

  Furthermore, in the present invention, any support means can be adopted as the support means for supporting the water tank filter in the water tank.

  In the present invention, a detachable closing plug may be provided at the drain outlet 44 of the flow path switching pipes P1 to P9, and the drain outlet 44 may be opened only when necessary, such as during drainage.

  The aquarium filter of the present invention can be applied for filtering water in an aquarium such as an aquarium fish tank used in general households.

1: Filter casing 12: Hook (return flow path)
15: Filter medium 2: Circulation pump 21: Suction port 22: Discharge port 3: Introducing pipe 42: Inlet port 43: Outlet for circulation 44: Outlet for drainage 441: Pipe-shaped joint A: Water tank F1-F4: Water tank filter P1 To P9: flow path switching pipe (flow path switching means)
W: Water

Claims (8)

A filter casing that is attached to the upper edge of the wall of the aquarium and in which a filter medium is accommodated; a circulation channel in which water flows into the filter casing from the aquarium and returns to the aquarium through the filter casing; A water tank filter provided with a circulation pump installed on the circulation flow path, wherein water flows along the circulation flow path by driving the circulation pump,
A flow path switching means is provided downstream of the circulation pump in the circulation flow path,
The flow path switching means has an inlet and a circulation outlet arranged corresponding to the circulation flow path, and a drainage outlet arranged at a position separated from the circulation flow path,
The flow path switching means is configured to circulate the water flowing in from the inflow port from the circulation outlet and circulate along the circulation flow path, and to discharge the water flowing in from the inflow port from the drain outlet. It is configured to be switchable between the drainage state to be
Aquarium filter, characterized in that the drainage outlet of the flow path shifting unit is disposed above the water surface of the water tank. A filter casing that is attached to the upper edge of the wall of the aquarium and in which a filter medium is accommodated; a circulation channel in which water flows into the filter casing from the aquarium and returns to the aquarium through the filter casing; A water tank filter provided with a circulation pump installed on the circulation flow path, wherein water flows along the circulation flow path by driving the circulation pump,
A flow path switching means is provided downstream of the circulation pump in the circulation flow path,
The flow path switching means has an inlet and a circulation outlet arranged corresponding to the circulation flow path, and a drainage outlet arranged at a position separated from the circulation flow path,
The flow path switching means is configured to circulate the water flowing in from the inflow port from the circulation outlet and circulate along the circulation flow path, and to discharge the water flowing in from the inflow port from the drain outlet. It is configured to be switchable between the drainage state to be
The drain outlet of the flow path switching means is arranged in the filter casing in a plan view, and the water flowing out from the drain outlet is collected in the filter casing. Aquarium filter. When the flow path until the water in the water tank reaches the inside of the filter casing among the circulation flow paths is an introduction flow path,
The water tank filter according to claim 1 or 2 , wherein the flow path switching means is disposed at a downstream end of the introduction flow path. The aquarium filter according to any one of claims 1 to 3, wherein a pipe-shaped joint capable of connecting an end of a drainage hose is provided at a drainage outlet of the flow path switching unit. A hook is provided on the filter casing,
By the lock part is hooked to the upper edge of the wall of the aquarium, the filter casing according to any one of claims 1 to 4 which is disposed along the outer wall surface or the inner wall surface of the tank Aquarium filter. One end is disposed below the water surface of the aquarium, and the other end includes an introduction pipe disposed in the filter casing,
The aquarium filter according to claim 5 , wherein a suction port of the circulation pump is connected to the other end of the introduction pipe, and an inlet of the flow path switching unit is connected to a discharge port of the circulation pump. The aquarium filter according to any one of claims 1 to 4 , wherein the filter casing is attached to an aspect in which the filter casing is placed on an upper end edge of a wall portion of the aquarium. One end is disposed in the water tank, and the other end includes an introduction pipe disposed in the filter casing.
A discharge port of the circulation pump is connected to one end of the introduction pipe, and at least a suction port of the circulation pump is disposed below the water surface of the water tank,
The aquarium filter according to claim 7 , wherein an inlet of the flow path switching unit is connected to the other end of the introduction pipe.

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