Liquid purification or separation – Structural installation – Closed circulating system
Patent
1988-05-11
1990-01-30
Fisher, Richard V.
Liquid purification or separation
Structural installation
Closed circulating system
2104162, 119 5, A01K 6304
Patent
active
048971880
ABSTRACT:
A filtering device includes a water suction case having a plurality of water suction ports connected to water flow passages formed therein so as to make gravel spreaded over the bottom of a water basin perform the filtering operation. The case is buried in the gravel, and a pumping means is connected to the water suction case so as to circulate water in the passage to the upper portion of the water basin. The water suction case includes a first suction portion extending linearly to form a first passage constituting a part of said water flow passages, a plurality of linerar second suction portions provided perpendicularly to the first suction portion at positions leaving spaces with each other in the longitudinal direction of the first suction portion to form second passages constituting a part of said water flow passages, said second passages communicating perpendicularly with the first passage, and a third suction portion provided perpendicularly to the individual second suction portion in parallel with the first suction portion to form a third passage constituting a part of said water flow passages, said third passage communicating commonly with the respective second passages. Collars extending at both sides are integrally projected from the first, second and third suction portions. The water suction ports are perforated in the first, second and third suction portions at positions lower than the collars, and the cross sectional area of the third passage is set larger than that of the first and second passages.
REFERENCES:
patent: 2848111 (1958-08-01), Gare
patent: 2935199 (1960-05-01), Willinger
patent: 3151069 (1964-09-01), Halpert
patent: 4035298 (1977-07-01), Cloke et al.
patent: 4268387 (1981-05-01), Hall
patent: 4556485 (1985-12-01), Ogawa
patent: 4620924 (1986-11-01), Goldman et al.
Fisher Richard V.
Lee Coreen Y.
Suisaku Kabushiki Kaisha
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