Fluid handling – Siphons – Plural
Patent
1991-11-12
1993-12-28
Michalsky, Gerald A.
Fluid handling
Siphons
Plural
137135, F04F 1000
Patent
active
052730670
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a liquid dosing apparatus adapted to repeatedly collect liquid in a tank and, each time the liquid therein has risen to a predetermined upper level, to automatically drain the tank to a predetermined lower level. More precisely, the invention concerns a liquid dosing apparatus of the type defined in the preamble to claim 1 and disclosed in U.S. Pat. No. 2,468,692.
When soil is infiltrated with waste water, a bacterial flora is formed which decomposes the impurities in the water. Naturally enough, the decomposition capacity of such a bacteria-permeated soil layer, a so-called bioskin, is limited, for which reason the waste water must be distributed over a sufficiently large area to avoid considerable environmetal and health hazards. According to current instructions for manufacturing and dimensioning of infiltration plants, the water should be distributed by means of distributing pipes having a given minimum length. Furthermore, the underside of the pipes should be formed with uniformly distributed outlet holes of a given size. Also, the pipes should be placed in a bed of sand or gravel.
Since the holes must be large enough not to be clogged by the impurities in the water, a feeble flow of water will find its way out through the lowest holes or the holes closest to the inlet of the pipe. In such conditions, the waste water will thus be distributed over an area much smaller than the one intended, whereby the impurities will pass unaffected through the bioskin. Moreover, the risk is considerable that the water will find its way directly down to the ground water, and it is, of course, of the outmost importance that such risks be eliminated as far as possible.
One way to distribute the waste water over the entire intended surface is to let it flow out intermittently. In that case, the flow momentarily becomes strong enough to fill the distribution pipes with water, and essentially the same amount of water then flows out through each of the outlet holes. This may, for instance, be achieved in that a pump is made to drain a receptacle, or in that the receptacle is provided with a valve which is opened to let out the water when this has risen to a certain level. However, a pump requires electric installations with wires laid in the ground, and a pump device cannot be expected to give reliable service for several decades, as required. Nor is it easy to provide a valve system which does not leak and which also in other respects stays reliable during that time.
One object of the present invention is therefore to provide a liquid dosing apparatus for the above-mentioned purpose, which has few moving parts, is extremely reliable, does not require any electric equipment or electric connections, and has a mode operation which does not depend on the unfailingly intact sealing function of a periodically working valve means.
DE 121,358 discloses a liquid dosing apparatus fulfilling some of these requirements. The siphoning apparatus described therein comprises a tank to be repeatedly filled with liquid to an upper level; a float adapted to rise in the tank concurrently with the filling thereof and, each time the upper level has been reached, to be wholly or partly filled with liquid so as to sink in the tank to actuate a draining siphon adapted to drain the tank to a lower level; and a float siphon associated with the float and adapted to drain the float so that this will float again when the liquid level rises after the tank has been drained. In this known apparatus, the vertically movable float is fixedly connected with a valve member arranged in the draining siphon. When the tank is being filled, the valve member sealingly rests against a valve seat so as to prevent any water from flowing out through the siphon. At the end of the filling operation, the float is applied against an upper abutment so that the continuing filling of the tank causes water to flow over into the float which is thus filled. The ensuing sinking of the float causes the valve member to move down and away from the val
REFERENCES:
patent: 1129898 (1915-03-01), Patton
patent: 2468692 (1949-04-01), Stevens
Andersson Alf
Andersson Soren
Burell Ingemar
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