Dispensing – Automatic control – Of dispensers with fluid pressure discharge assistance
Reexamination Certificate
1998-12-22
2001-04-10
Shaver, Kevin (Department: 3754)
Dispensing
Automatic control
Of dispensers with fluid pressure discharge assistance
C222S064000, C222S444000
Reexamination Certificate
active
06213348
ABSTRACT:
The present invention concerns a liquid pumping system. Such a pumping system can work as a pump with various liquids. One application of such a pumping system can consist of a liquid gun, such as for water, which can project a liquid at a great distance and at a controllable rate, for example for watering plants or as a water cannon for use against fire or riots.
BACKGROUND OF THE INVENTION
In order to spray a liquid, use is generally made of centrifugal pumps which are coupled to a thermal engine. The drawback of such pumps is that they require a relatively high power. For example, a centrifugal pump which has an output of 1300 liters/minute at a pressure of 12 bar requires, for the thermal engine in which drives this, a power of 120 continental horsepower.
The aim of the invention is to propose a liquid pumping system which considerably reduces this power required for spraying said liquid, for example in a ratio of 8 to 10.
BRIEF SUMMARY OF INVENTION
To this end, a system for pumping a liquid according to the invention is characterised in that it consists of a chamber provided with an orifice for introducing, into the chamber, a liquid issuing from a source, an orifice for discharging the liquid out of the chamber and an orifice opposite to the orifice for discharging the liquid for introducing pressurised gas, each orifice being provided with a valve, the valves being controlled in a synchronized fashion according to two phases, a first so-called filling phase in which the valve associated with the introduction orifice is open whilst the other two valves are closed, thus enabling the chamber to be filled, and a second so-called expulsion phase in which the valve associated with introduction orifice is closed whilst the other two valves are open enabling pressurised gas to be introduced into the chamber through the introduction orifice, thus expelling the liquid contained in the chamber through the discharge orifice.
According to another characteristic of the invention, the chamber is provided with a vent opposite to the liquid introduction orifice, the vent itself being provided with a valve which opens and closes at the same time as the valve associated with the liquid introduction orifice.
According to another characteristic of the invention, alternative to the previous one, the chamber is provided with an orifice connected, via a valve, to a vacuum pump, the valve opening and closing at the same time as the valve associated with the liquid introduction orifice.
According to another characteristic of the invention, the valve associated with the introduction orifice is situated at the end of the chamber which is provided with the discharge orifice, the vent being situated at the other end.
According to another characteristic of the invention, it has means for detecting liquid levels in the said chamber, whose signals are supplied to a control unit designed to be able to control the opening and closing of the valves.
According to another characteristic of the invention, the chamber has, on the same side as its discharge orifice, a tapered part narrowing towards the discharge orifice.
The present invention also concerns a set of pumping system s in accordance with a pumping system as just described. According to the invention, it is characterised in that each system is controlled so that the discharge phases of each discharge system follow one after the other, and in that, whilst that of one system is current, filling phases are implemented in the other systems.
According to another characteristic of this set, the number n of discharge systems in the set is such that n times the discharge time correspond to a filling time.
REFERENCES:
patent: 4274552 (1981-06-01), Proni
patent: 4921134 (1990-05-01), Aschberger et al.
patent: 5294023 (1994-03-01), Ioannides et al.
patent: 5480063 (1996-01-01), Keyes et al.
patent: 5568882 (1996-10-01), Takacs
patent: 5680960 (1997-10-01), Keyes et al.
Deal David
Laff, Whitsel & Saret, Ltd.
Shaver Kevin
Whitesel J. Warren
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