Liquid purification or separation – Structural installation – Closed circulating system
Reexamination Certificate
2002-12-13
2004-12-14
Prince, Fred G. (Department: 1724)
Liquid purification or separation
Structural installation
Closed circulating system
C210S416200, C210S805000, C137S602000
Reexamination Certificate
active
06830680
ABSTRACT:
This invention relates to a filtration process for swimming pools enabling to considerably improve the effectiveness of the filtration by increasing the flow of filtered water without increasing the power of the pumps needed for the water circulation.
Conversely, it is possible, by using pumps of reduced power, to maintain the same filtration quality than obtained with higher-powered pumps.
According to the U.S. Pat. No. 4,501,659, an approach has attempted to use the pump return or discharge flow, i.e. the water returned to the pool after filtration, to increase the suction rate of the water admitted into an added basket acting as what is known as a surface skimmer or “skimmer.” This approach, illustrated in particular in
FIG. 7
of this patent, and sketched in
FIG. 8
of this request, uses the effect known as “Venturi” to send the pump return flow through a tubing
117
that opens by a nozzle
119
in a port
124
at the base of the receptacle
113
which the pool water enters through an opening
114
. The water return from the circulation pump, if it takes place for instance under a flow of 10 m
3
will generate, as it drives the water stream, an output flow of 25 m
3
for instance as it exits the port
124
. These 15 m
3
are thus sucked through the opening
114
, instead of the 10 m
3
only that would be obtained if all the pump return water had to be replenished though the opening
114
. Not only is the inflow increase not actually significant, but this device is inconvenient to use because it does not in particular enable to select the best locations for the return and the suction which will necessarily be superimposed. Moreover, this document does not address an actual water filtration, but only the gathering in the basket
134
of the biggest particles such as leaves that may float on the water.
FIG. 9
will help to better understand the operating principle of this patent.
FIG. 9
shows the diagram of the overall system lay-out, supposing for instance that the water suction is performed by a pump
10
, at the level of a bottom plug
11
, via a filter
12
, with the return in
13
(corresponding to the opening
124
of
FIG. 8
) and the suction in
14
, right above (corresponding to the admission opening
114
) for the recycling in that part of the pool of a water stream going through the basket
134
.
Contrary to the abovementioned document approach, this invention uses at least some of the return water flow of the circulation pump to send it in at least one flow multiplier, consisting essentially of a convergent tuyere followed by a divergent tuyere with, at the intermediary location, an admission for said pump return water flow, the entrance on the side of said convergent tuyere of the flow multiplier communicating with at least one admission for the water to be filtered that comes from the swimming pool and goes through a filter suitably set upstream from this admission; meanwhile, the exit on the side of the divergent tuyere opens to the return pool.
Not only is the flow multiplier of this invention markedly more effective, as shown more clearly in the following description, than the nozzle driver of the document U.S. Pat. No. 4,501,659, but in addition the process of this invention enables to filter the total multiplied water flow and, besides, to feedback the return water with its multiplied flow to any suitable pool location.
According to another characteristic of this invention, the admission of the water to be filtered can be advantageously performed by means of at least one skimmer.
The invention also relates to a water flow multiplier, characterized in that it consists of:
on the suction side a convergent tuyere;
on the return side a divergent tuyere;
at the neck level, between the two connecting tuyeres, a ring around the narrower section, said ring receiving the pump return water that comes through an annular slit to the beginning of the divergent tuyere.
This invention also relates, of course, to a swimming pool equipped with a filtration system designed according to this process or equipped with a flow multiplier according to this invention.
The invention and its implementation will appear more clearly from the following description in reference to the accompanying drawings.
REFERENCES:
patent: 2247116 (1941-06-01), Day
patent: 3304564 (1967-02-01), Green et al.
patent: 3552568 (1971-01-01), Wade
patent: 3756220 (1973-09-01), Tehrani et al.
patent: 4501659 (1985-02-01), Henk
patent: 4826591 (1989-05-01), Macia
patent: 5238585 (1993-08-01), Reed, Sr.
patent: 5695654 (1997-12-01), Schultz
patent: 5785846 (1998-07-01), Barnes et al.
patent: 5893641 (1999-04-01), Garcia
patent: 6609374 (2003-08-01), Feucht et al.
patent: 2710363 (1995-03-01), None
Prince Fred G.
Rothwell Figg Ernst & Manbeck
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