A water tank filter having a double structure including an inner filter having a small pore size for trapping fine particles of filth from tank water and situated within a hollow outer filter having a large pore size for trapping coarse particles of filth. The inner filter is situated in roughly the
A water tank filter having a double structure including an inner filter having a small pore size for trapping fine particles of filth from tank water and situated within a hollow outer filter having a large pore size for trapping coarse particles of filth. The inner filter is situated in roughly the upper half of the internal space of the outer filter. Disclosed also is a water tank purifier including the water tank filter. The water tank filter and purifier can effectively remove both coarse and fine particles of filth from a water tank. The filter does not quickly get clogged, and is easy to handle.
대표청구항▼
What is claimed is: 1. A water tank filter comprising: an outer filter and an inner filter, the outer filter being a hollow structure and having a large pore size, and trapping coarse particles of filth from water in a water tank, while the inner filter is situated in roughly the upper half of the
What is claimed is: 1. A water tank filter comprising: an outer filter and an inner filter, the outer filter being a hollow structure and having a large pore size, and trapping coarse particles of filth from water in a water tank, while the inner filter is situated in roughly the upper half of the internal space of the outer filter and has a small pore size for trapping fine particles of filth in the water, and wherein the outer filter is of an outer filter material formed by a metal or fiber net, or a foamed resin sheet, while the inner filter is of an inner filter material formed by a woven or non-woven fabric, or Japanese "Washi" paper. 2. The water tank filter according to claim 1, wherein the outer filter material has a pore size enabling it to trap filth having a particle size of 500 microns or more, while the inner filter material has a pore size enabling it to trap filth having a particle size of from 0.1 micron to less 500 microns. 3. A water tank purifier comprising a filter casing adapted to be mounted on the wall of a water tank, the filter casing having a filthy water storage chamber and a filter chamber divided from each other by an overflow partition, the filthy water storage chamber having a water suction pipe connected for drawing water from the water tank by a motor pump, while in the filter chamber is installed a water tank filter according to claim 2 and has a water outlet formed above the water tank. 4. The water tank filter according to claim 2, wherein the outer filter has its outer filter material placed outside a pair of spacer frames which can be opened and closed by a hinge mechanism, while the inner filter is situated between the spacer frames. 5. A water tank purifier comprising a filter casing adapted to be mounted on the wall of a water tank, the filter casing having a filthy water storage chamber and a filter chamber divided from each other by an overflow partition, the filthy water storage chamber having a water suction pipe connected for drawing water from the water tank by a motor pump, while in the filter chamber is installed a water tank filter according to claim 4 and has a water outlet formed above the water tank. 6. The water tank filter according to claim 2, wherein the inner filter comprises a bag of the inner filter material packed with a porous material. 7. A water tank purifier comprising a filter casing adapted to be mounted on the wall of a water tank, the filter casing having a filthy water storage chamber and a filter chamber divided from each other by an overflow partition, the filthy water storage chamber having a water suction pipe connected for drawing water from the water tank by a motor pump, while in the filter chamber is installed a water tank filter according to claim 6 and has a water outlet formed above the water tank. 8. The water tank filter according to claim 6, wherein the porous material comprises fine particles of healstone. 9. The water tank filter according to claim 8, wherein the fine particles of healstone have a specific average particle diameter within the range of 20 to 1000 microns. 10. A water tank purifier comprising a filter casing adapted to be mounted on the wall of a water tank, the filter casing having a filthy water storage chamber and a filter chamber divided from each other by an overflow partition, the filthy water storage chamber having a water suction pipe connected for drawing water from the water tank by a motor pump, while in the filter chamber is installed a water tank filter according to claim 8 and has a water outlet formed above the water tank. 11. A water tank purifier comprising a filter casing adapted to be mounted on the wall of a water tank, the filter casing having a filthy water storage chamber and a filter chamber divided from each other by an overflow partition, the filthy water storage chamber having a water suction pipe connected for drawing water from the water tank by a motor pump, while in the filter chamber is installed a water tank filter according to claim 1 and has a water outlet formed above the water tank. 12. The water tank purifier according to claim 11, wherein the water suction pipe is so branched as to have a plurality of water inlets situated in a plurality of regions in the water tank where filth is more likely to gather. 13. The water tank purifier according to claim 11, wherein the water suction pipe has a multiplicity of water suction holes formed in its wall along its length. 14. The water tank purifier according to claim 11, wherein the overflow partition has a slitted plate extending above the filter chamber for trapping particularly coarse particles of filth. 15. A water tank purifier comprising a filter casing adapted to be mounted on the wall of a water tank, the filter casing having a filthy water storage chamber and a filter chamber divided from each other by an overflow partition, the filthy water storage chamber having a water suction pipe connected for drawing water from the water tank by a motor pump, while in the filter chamber is installed a water tank filter according to claim 1 and has a water outlet formed above the water tank. 16. The water tank filter of claim 1, wherein when said water tank filter is installed in a filter chamber of said water tank, said water tank filter divides said filter chamber into an upstream filter chamber and a downstream filter chamber.
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Barnard, Royal W., Compact water purifying device.
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