GB2195910A - Fishtank filter - Google Patents

Fishtank filter Download PDF

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Publication number
GB2195910A
GB2195910A GB08622772A GB8622772A GB2195910A GB 2195910 A GB2195910 A GB 2195910A GB 08622772 A GB08622772 A GB 08622772A GB 8622772 A GB8622772 A GB 8622772A GB 2195910 A GB2195910 A GB 2195910A
Authority
GB
United Kingdom
Prior art keywords
filter
housing
tube
filter according
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08622772A
Other versions
GB8622772D0 (en
Inventor
Chi-Lok Tong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB08622772A priority Critical patent/GB2195910A/en
Publication of GB8622772D0 publication Critical patent/GB8622772D0/en
Publication of GB2195910A publication Critical patent/GB2195910A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/26—Filters with built-in pumps filters provided with a pump mounted in or on the casing
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
    • A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
    • A01K63/045—Filters for aquaria
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/02—Filters formed by clamping together several filtering elements or parts of such elements in which the elements are pre-formed independent filtering units, e.g. modular systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection

Abstract

Rising air bubbles from nozzle 51 induce a flow of water up a central tube 46 of a filter 40, the air leaving by outlets 47 while the water flow outwards through filter material 43 to outlets 48. In Fig. 9 several filters 40 are stacked to operate in parallel with a single air supply. Each filter 40 also has a lower compartment wherein water is drawn inwards through upstream filter material before entering tube 46. Instead of a nozzle 51, the filter may utilise rising air bubbles from a conventional filter below. <IMAGE>

Description

SPECIFICATION Fishtank filter The present invention relates to a fishtank filter and, in particular, to a fishtank filter which may be used in combination with an underwater filter.
A conventional underwater fishtank filter comprises filter material, such as sponge, a perforated housing for housing the filter material, and an air pump for providing an air bubble stream.
The air bubble stream provided by the air pump has basically two functions, one is to help aquatic life breathe by dissolving oxygen in the water and the other is to cause water to pass through the filter material housed in the filter.
The housing of a known type of fishtank filter has an outlet for an air bubble stream, in the form of a long, narrow funnel at the top of the housing, and perforations in the housing sidewalls. The flow of bubbles through the outlet will carry water up the tube and out of the filter housing. Hence water close to the performations will be sucked into the housing through the perforations and hence through the filter material.
The air bubbles leave the outlet of the filter housing well below the water level to enhance eye appeal and also to enhance oxygen dissolution.
A first aim of the present invention is to provide a filter which may be used in combination with another filter by utilizing a rising stream of air bubbles provided by the other filter.
Thus a first aspect of the invention provides a filter for a fishtank comprising a housing having one or more first openings at an upper end thereof to allow air to pass out of the housing and one or more second openings below the first openings to allow water to pass out of the housing, a tube extending within the housing and filter material housed in the housing between the tube and the second opening or openings, whereby when the filter is positioned in water in a said fishtank, water may be pumped up through the tube by a rising stream of air bubbles in the tube so as to pass through the filter material and out of the housing through the second openings.
Preferably a bottom wall is provided connecting the housing wall and the tube at the lower ends thereof.
Preferably the tube is aligned along an axis of the housing and the bottom wall is coneshaped, the bottom wall extending from a lower end of the housing up into the housing to form a recess at the lower end for guilding air bubbles into the tube.
Alternatively, the filter may advantageously have upper and lower compartments with the tube extending therebetween.
Each compartment may have filter material.
Other preferred and/or optional features of the first aspect of the invention are set forth in the accompanying claims.
A filter according to the invention will provide an improved filtering rate of the water. A second aim of the present invention is to provide a method of using a filter according to the first aspect of the invention in combination with another filter.
Thus a second aspect of the invention provides a method of filtering water in a fishtank using a filter according to anyone of the preceding claims in combination with an underwater filter utilising a bubble stream, wherein air bubbles coming up from the bubble stream of the underwater filter are used to operate the said filter.
A third aim of the present invention is to prevent freshly filtered water entering the filter of the invention from a filter located therebelow.
Thus a third aspect of the invention provides a combination of a filter according to the first aspect of the invention, with an underwater filter positionable below the housing, wherein barrier means is provided between the filter and the underwater filter and spaced below the filter, to allow a rising stream of bubbles from the underwater filter to pass therethrough but divert water carried with the bubbles away from the filter.
The invention will now be described in more detail by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a first embodiment of a fishtank filter according to the first aspect of the present invention, Figure 2 shows one way of using the filter of Figure 1 in combination, Figure 3 is a sectional side view of Figure 2 taken along the axis of the filter of Figure 1, Figure 4 is a sectional side view showing a second type underwater fishtank filter, Figure 5 shows a barrier means embodying the present invention, Figure 6 shows an underwater filter of Figure 4 incorporating the barrier means of Figure 5, Figure 7 shows the way two filters of Figure 6 are used in stack, Figure 8 shows the filters of Figure 1 to 4 together with the barrier means of Figure 5 used in combination with an existing filter incorporating an air pump, and Figure 9 is a perspective view of another embodiment of a fishtank filter according to the invention with a part cut-away in order to illustrate the internal construction of the filter.
Referring now to the drawings, the filter 10 shown in Figure 1 comprises a cylindrical outer wall 11, a tube 12 and a bottom wall 13. The bottom wall 13 is integral with the outer wall 11, and comprises a conical portion 14 extending up from a bottom edge of the outer wall 11 to define an entry recess 16 and a short cylindrical portion 15 integrally formed at the apex of the conical portion 14.
The tube 12 is a push fit around the short cylindrical portion 15.
The outer wall 11 is coaxial with the tube 12. It also extends beyond the tube 12 at the upper end of the filter 10.
Perforations in the form of longitudinally extending slots 17 are provided in the outer wall 11. Filter material 18 is provided in the compartment formed between the outer wall 11 and the tube 12. The filter material covers the slots 17 in the outer wall 11.
Figures 2 and 3 show how the filter 10 is used in combination with an underwater fishtank filter 20.
Filter 20 comprises a housing 21 with openings 22, a central tube 23 and filter material 25. Air is supplied from an air pump (not shown) into the housing 21 via a tube 24.
The passage of air bubbles 26 up the tube 23 carries water out of the housing 21. As a result water outside the housing 21, close to the openings 22, is sucked into the housing 21 through the openings 22. Therefore a current of water is produced flowing into the housing 21 via openings 22, through the filter material 25 inside the housing 21, and then out via tube 23, thus filtering the water.
The filter 10 of the invention is used directly above the existing underwater filter 20.
It is fixed in position so that the water level of the fishtank 19 is between the upper ends of the outer wall 11 and the tube 12.
The air bubbles and water stream coming up from the filter 20 is collected by the recess 16 formed by the bottom portion 13 of the filter 10, and directed into the tube 12..
Water is carried up the tube 12 by the air bubble stream, as for the filter 20 and overflows the tube 12 to enter into the compartment formed between the outer wall 11 and the tube 12. This increases slightly the water level inside the compartment relative to the outside water level, causing water to flow down through the filter material 18 and out of the compartment through slots 17.
The tube 23 of the underwater filter 20 may extend inside the tube 12 of the filter 10. In this way the two filters 10 and 20 are effectively combined into a single filter providing a double stage water filter.
The tube 12 of the filter 10 should preferably be designed to fit the tube 23 of the filter 20. This will ensure that water being carried into the filter interior may not come out through the space between them.
Another embodiment of the filter according to the present invention may comprise a recess which is not conical. The bottom wall portion is planar and the lower end of the outer wall extends beyond the bottom wall to form a prismatic recess.
Figure 4 shows a second type of underwater filter 30 which is operated in basically the same fashion as the conventional underwater filter 20. One difference is that the filter 30 does not incorporate any air pump. It is operated by utilizing air bubbles collected by a recess formed by its bottom wall. The air bubbles may come from another underwater filter down below.
Figure 5 shows a barrier means 31 which comprises an inverted dish 32 with perforations 33 at the centre thereof. Air bubbles coming from below are collected by the barrier means 31 at the centre of the dish 32.
The size of the perforations 33 is chosen so that air bubbles may easily slip through the perforations 33 whereas water may not be able to pass through the perforations 33 quickly and hence is diverted sideways and downwards by the rising air bubble stream and water current.
Figure 6 shows a filter 36, which is a combination of the filter 30 with the barrier means 31, comprising a perforated housing 34, filter material 35 and a bottom wall barrier means 31. The operation of the filter 36 is identical to that of the filter 20 or 30.
It is generally believed that an air bubble stream may carry water in its vicinity more efficiently than a water stream. Therefore a barrier means is used below a fishtank filter to divert water from a rising bubble stream from entering into the filter.
Figure 7 shows two filters 36 used in a stack with the lower end of the barrier means-bottom wall 31'-of the upper filter 36 releasably engaged with the upper end of the lower filter 36'. In operation, water in the vicinity of the filter 36' is sucked into the housing as described hereinbefore. It is then diverted from rising into the upper filter 36 by a barrier means 31 provided thereof. An opening 37 is provided at a sidewall of the barrier means 31' to allow diverted water to come out of the housing. In order to avoid the water coming out from re-entering the filter stack, housing sidewall 38 close to the opening 37 is not perforated.
Figure 8 shows a vertical arrangement of the filter 10, the barrier means 31, the filter 30 and the filter 20 used in combination in a fishtank. The filter 20 is placed on gravel at the bottom of the fishtank and operated by an air pump (not shown). Air bubble and water streams coming out from the filter 20 are used to operate the filter 30 as hereinbefore described. The barrier means 31 then diverts the water stream coming from the filter 30 downward, and at the same time allows the air bubbles therefrom to pass through it. The air bubbles are finally used to operate the filter 10 at water level.
The barrier means 31 should be placed at a suitable distance below the filter 10 in order to allow water in vicinity of the filter bottom to be carried up into the filter 10 by the air bubbles.
Alternatively, the filter 30 may be replaced by the filter 36 which is incorporated with a barrier means bottom wall 31'.
Alternatively, a stack of filters 36, as shown in Figure 7, may be used instead to enhance filtering rate of water.
The embodiment shown in Figure 9 comprises three filters 40 stacked one on top of another. Each filter 40 has an upper compartment 41 and a lower compartment 42 each housing filtering material 43, 44, respectively; in annular form. The compartments 41 and 42 are separated by a partition wall 45. A tube 46 extends upwards through the wall 45 from a position adjacent to the lower end of the lower compartment 42 to a position spaced upwardly of the wall 45. The upper end of each filter 40 is closed and provided with perforations 47 at its centre. The size of the perforations 47 is chosen so that air bubbles may easily slip through the perforations 47 whereas water may not be able to pass therethrough quickly and hence is diverted sideways and downwards by a rising air bubble stream and water current.The closed upper end of each filter is preferably conical, pyramidical, domed or otherwise upwardly raised at its centre so as to encourage the air bubbles to move-towards the perforations 47.
The sidewalls of the upper and lower compartments 41 and 42 are provided with openings in the form of a plurality of apertures 48 and 49, respectively. The apertures 48 in the upper compartments are displaced angularly with respect to the apertures 49 in the lower compartments in order to avoid the water coming out from the upper compartments reentering the lower compartments of the stack.
An annular gap is preferably left between the filtering material and respective sidewalls of the filters to allow water to pass around the gap so that clogging of the filter material is not localised in the region of the apertures 48 or 49.
The three filters 40 are preferably separable from one another and indeed more or less filters could be used according to the depth of the fishtank. Moreover, each filter 40 preferably consist of two separable parts one defining the upper compartment 41 and the other defining the lower compartment 42 and including the partition wall 45 and the tube 46.
This facilitates assembly.
As shown, the lowermost filter 40 includes a base 50 fitted with an air supply nozzle 51 which in use is connected to an air pump (not shown) by a tube (not shown). The filter stack could, alternatively, be mounted in a fishtank directly above an existing filter, such as filter 20 shown in Figure 2.
The filters 40 may also have suction pads (not shown) provided on the sidewalls thereof for attaching the filters to an internal wall or walls of the fishtank.
Various modifications to the invention may be apparent to those skilled in the art. It is intended to include all these modifications as fall within the scope of the accompanying

Claims (25)

claims. CLAIMS
1. A filter for a fishtank, comprising a housing having one or more first openings at an upper end thereof to allow air to pass out of the housing and one or more second openings below the first openings to allow water to pass out of the housing, a tube extending within the housing and filter material housed in the housing between the tube and the second opening or openings, whereby when the filter is positioned in water in a said fishtank, water may be pumped up through the tube by a rising stream of air bubbles in the tube so as to pass through the filter material and out of the housing through the second openings.
2. A filter according to claim 1, wherein the housing is tubular and is arranged in use with its upper end above the water level.
3. A filter according to claim 1 or 2, wherein said second opening or openings are between the lower end of the tube and the housing wall.
4. A filter according to claim 1 or 2, wherein a bottom wall is provided connecting the housing wall and the tube at the lower ends thereof.
5. A filter according to claim 4, wherein said inner tube is detachably engageable with the bottom wall.
6. A filter according to claim 5, wherein said tube is a push-fit in a socket provided on the bottom wall.
7. A filter according to claim 4, wherein said housing extends below the lower end of the tube.
8. A filter according to claim 7, wherein the tube is aligned along an axis of the housing and the bottom wall is cone shaped, the bottom wall extending from a lower end of the housing up into the housing to form a recess at the lower end for guiding air bubbles into the tube.
9. A filter according to claim 7, wherein the bottom wall is generally planar and extends radially outwardly from the lower end of the tube to the housing wall.
10. A filter according to anyone of the preceding claims, wherein said second opening or openings are provided in a sidewall of the housing.
11. A filter according to claim 10, wherein said openings are longitudinally extending slots.
12. A filter according to anyone of the preceding claims, wherein said housing extends above said tube at the upper end thereof.
13. A filter according to claim 1, having upper and lower compartments with the tube extending therebetween.
14. A filter according to claim 13, wherein each compartment houses filter material.
15. A filter according to claim 13 or 14 wherein the second opening or openings are provided in a sidewall of the upper compartment and one or more third openings are provided in a sidewall of the lower compartment for the entry of water thereto.
16. A filter according to anyone of claims 13 to 15, wherein the upper end of each filter is closed and provided with perforations at its centre for the passage therethrough of air bubbles.
17. A filter according to anyone of claims 13 to 16, wherein the filter comprises two seperable parts.
18. A filter according to anyone of the preceding claims, wherein means are provided for attaching the filter to an internal wall of a fishtank.
19. A filter according to claim 18, wherein the attachment means comprise one or more suction pads.
20. A filter assembly comprising two or more filters according to anyone of claims 13 to 17, or claims 18 or 19 when dependent on anyone of claims 13 to 16, arranged in a stack one above the other.
21. A filter assembly according to claim 20, wherein the lowermost filter of the stack has a base.
22. A filter assembly according to claim 21, wherein air bubble supply means is provided in the lower compartment of the lowermost filter of the stack.
23. A filter substantially as hereinbefore described with reference to the accompanying drawings.
24. A method of filtering water in a fishtank using a filter according to anyone of claims 1 to 19 in combination with an underwater filter utilizing a bubble stream, wherein air bubbles coming up from the bubble stream of the underwater filter are used to operate said filter.
25. A combination of a filter according to anyone of claims 1 to 12, with an underwater filter positionable below the housing, wherein barrier means is provided between the filter and the underwater filter and spaced below the filter, to allow a rising stream of bubbles from the underwater filter to pass therethrough but divert water carried with the bubbles away from the filter.
26 A combination according to claim 25, wherein the barrier means is an inverted dish with perforations at the centre thereof.
GB08622772A 1986-09-22 1986-09-22 Fishtank filter Withdrawn GB2195910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08622772A GB2195910A (en) 1986-09-22 1986-09-22 Fishtank filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08622772A GB2195910A (en) 1986-09-22 1986-09-22 Fishtank filter

Publications (2)

Publication Number Publication Date
GB8622772D0 GB8622772D0 (en) 1986-10-29
GB2195910A true GB2195910A (en) 1988-04-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08622772A Withdrawn GB2195910A (en) 1986-09-22 1986-09-22 Fishtank filter

Country Status (1)

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GB (1) GB2195910A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988009615A1 (en) * 1987-06-12 1988-12-15 Stiftelsen For Industriell Og Teknisk Forskning Ve Fish cultivation tank
EP0416351A1 (en) * 1989-09-08 1991-03-13 OASE-PUMPEN Wübker Söhne GmbH &amp; Co., Maschinenfabrik Poolfilter
US5527453A (en) * 1993-06-06 1996-06-18 Hachima; Hiroki Apparatus for treating dirty water aerated by solar powered compressor
DE102019122146B3 (en) * 2019-08-19 2021-02-18 Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung Mobile immersion filter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770128A (en) * 1972-02-23 1973-11-06 M Kast Device for treating aquarium water
US3994811A (en) * 1975-06-12 1976-11-30 Harvey Kenneth Cohen Protein skimmer and carbon filtration replaceable unit
US4025431A (en) * 1975-09-22 1977-05-24 Indianapolis Center For Advanced Research, Inc. Apparatus for cleaning and aerating water within an aquarium tank

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770128A (en) * 1972-02-23 1973-11-06 M Kast Device for treating aquarium water
US3994811A (en) * 1975-06-12 1976-11-30 Harvey Kenneth Cohen Protein skimmer and carbon filtration replaceable unit
US4025431A (en) * 1975-09-22 1977-05-24 Indianapolis Center For Advanced Research, Inc. Apparatus for cleaning and aerating water within an aquarium tank

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988009615A1 (en) * 1987-06-12 1988-12-15 Stiftelsen For Industriell Og Teknisk Forskning Ve Fish cultivation tank
EP0416351A1 (en) * 1989-09-08 1991-03-13 OASE-PUMPEN Wübker Söhne GmbH &amp; Co., Maschinenfabrik Poolfilter
US5527453A (en) * 1993-06-06 1996-06-18 Hachima; Hiroki Apparatus for treating dirty water aerated by solar powered compressor
DE102019122146B3 (en) * 2019-08-19 2021-02-18 Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung Mobile immersion filter
WO2021032245A1 (en) 2019-08-19 2021-02-25 Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung Mobile submersible filter

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