Liquid purification or separation – Structural installation – Closed circulating system
Patent
1997-06-16
1998-05-19
McCarthy, Neil
Liquid purification or separation
Structural installation
Closed circulating system
210 94, 2104162, A01K 6304, C02F 332
Patent
active
057531145
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for purifying water in a basin, such as for example a fishpond or an aquarium, whereby said device comprises a box-shaped transparent encasings, which bounds a space in which water fleas can be kept in numbers sufficient to purify water which enters said encasing via inlet openings, and whereby water exits the device into the bassin via an outlet, said outlet being connected to filtering means so as to prevent water fleas from being transported into said basin.
A device of this kind is known from Dutch Patent Application NL-A-9002231.
In this known device the water to be purified is supplied from the basin and is then led to a space where water fleas are present, which water fleas extract organic waste materials from the water, as a result of which the algae present in the water, which have a negative influence on the clarity of the water, are deprived of their food source, as a consequence of which they will die and precipitate. The purified water is subsequently led back to the basin.
A drawback of this known device is that any fish eggs present in the basin may find their way into said space via the water inlet openings if they become detached. Furthermore young (small) fish may find their way into said space via the water inlet openings. In that case the water fleas will be eaten by the (new) fish after the eggs have hatched, thus reducing the effectiveness of the device, which will eventually stop functioning altogether.
A further drawback of the known device is that the water fleas may leave said space, especially at night, thus reducing the effectiveness of the device.
SUMMARY OF THE INVENTION
The object of the invention is to provide a device which does not have the above drawbacks. One object is to provide a device which effectively fights algae. To that end a device according to the invention is characterized in that the device includes a cover with an edge at the upper side of the encasing, in that the filtering means are present at the top of said encasing, in that said filtering means are connected to the outlet of the device via a connecting piece, and in that said inlet are provided in a number of places between said edge of said cover and said encasing.
The invention is based on the perception that when the filtering means are placed at the top of the space rather than at the bottom, the water fleas will be unable to leave said space. The construction of the cover furthermore renders it impossible that the eggs find their way into the space via the inlet openings.
One embodiment of the device according to the invention is characterized in that said connecting piece comprises a water lift for transporting purified water.
One embodiment of a device according to the invention is characterized in that said cover comprises an additional protective edge for closing said space to fish eggs.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail hereafter by way of illustration with reference to the FIGURE, in which:
An embodiment of a device for purifying water is shown.
DETAILED DESCRIPTION OF THE INVENTION
The FIGURE shows an embodiment of a device 1 for purifying water in a basin, such as for example a fishpond, an aquarium, a swimming pool or the water supply at a horticultural farm.
The device comprises a box-shaped, for example cylindrical, encasing 3 made of a transparent material, such as glass, plastic or a transparent plastic material (for example PET). The encasing 3 comprises a space 5, in which filtering means 7 are placed. Said filtering means separate a space 9 from space 5. When the device is in use water fleas are present within space 5, said water fleas being unable to reach space 5 because of the presence of the filtering means 7. The encasing 3 is closed by a cover 11 at its upper side. An opening 13 is provided in (for example) the centre of said cover. A tubular connecting piece 15 is placed in said opening. Said connecting piece includes a first end 17, on which an outlet 19 is
REFERENCES:
patent: 5413707 (1995-05-01), Shatilov
patent: 5554277 (1996-09-01), Rief et al.
patent: 5593574 (1997-01-01), Van Toever
Green Theodore M.
McCarthy Neil
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