Fluid sprinkling – spraying – and diffusing – With selectively preset flow cutoff or initiating means
Patent
1993-03-01
1994-05-31
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
With selectively preset flow cutoff or initiating means
239322, 239323, 239468, 23953315, 2395533, 2395535, 2223865, 13762414, B05B 9047
Patent
active
053162153
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a liquid apparatus and two new outlet arrangements for such apparatus system.
In order to irrigate farm land with, for instance, a waste liquid such as water run-off, it is presently known to use a pump to pump the liquid through a pipe to a "rain" nozzle. Because of pressure losses over the pipe length, it is necessary to use heavy duty pumps and large bore (75-100 mm) pipes.
Arrangements are known for pressurising a liquid in a vessel, for use, e.g. in domestic or industrial water supply apparatus. One such arrangement comprises a rigid vessel capable of withstanding a high internal pressure and an inner, flexible bag. The liquid to be pressurised is pumped into the bag which expands in the vessel and pressurises the air in the vessel as the volume around the bag decreases. When full operating pressure is reached, the pump is turned off and liquid may be discharged from the vessel under pressure, for instance by a tap.
According to a first aspect of the present invention, there is provided a liquid delivery apparatus comprising:
(i) a liquid reservoir into which a liquid may be introduced via an inlet to pressurise said liquid in the reservoir;
(ii) an outlet via which said liquid may be discharged from the reservoir under the pressure of the liquid in the vessel;
(iii) a valve between the reservoir and the outlet to control passage of liquid from the reservoir to the outlet, said valve having (a) an opening, (b) a closure member adapted to close the opening, and (c) a biasing means, the arrangement of the components of the valve being such that the valve is normally held closed under the force of the biasing means and the pressure of the liquid in the reservoir;
(iv) a valve control mechanism for controlling the operation of the valve in response to the pressure of the liquid in the reservoir; and
(v) a means for transmitting the pressure in the reservoir to the valve control mechanism;
wherein the valve control mechanism comprises a movable element which is capable of being acted on by the pressure of the liquid in the reservoir and transmitting a resultant force to the closure member of the valve in a direction to open the valve, and wherein the respective effective surface areas of the movable element and the closure member and the force of the biasing means are chosen such that the closure member is opened when the pressure of the liquid in the reservoir reaches a predetermined level.
The apparatus of the present invention enables a small pump and relatively narrow gauge pipe (e.g. 25-30 mm) to be used in discharging a liquid onto, for example, agricultural land. The pressure of liquid in the reservoir is used to discharge waste liquid over a large area.
In a preferred embodiment, the system may have a rigid housing and an inner movable wall which subdivides the housing into first and second chambers, which are separated by the said wall and which are of variable volume depending upon the position of the said inner movable wall. The wall should be substantially liquid and gas impermeable. The inner wall may be rigid or semi-rigid with provision for moving in the housing to adjust the relative volumes of the first and second chambers. Alternatively, the inner wall may be a flexible membrane. The invention will be described with particular reference to the embodiment in which the inner wall is a flexible membrane. The first chamber on one side of the flexible membrane contains a substantially compressible fluid, normally a gas such as air, whilst the other side is the liquid reservoir into which the liquid to be distributed is pumped. As liquid is pumped into the second chamber (or reservoir), the flexible membrane will move permitting the second chamber to expand whilst reducing the volume of the first chamber and compressing and pressurising the fluid (normally air) in the first chamber. The pressure of the fluid on the one side of the membrane is transmitted (for instance by a simple pipe) to the valve control mechanism for controlling the operation of the valve. The secon
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Grant William
Merritt Karen B.
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