Pumps – Intensifier – Ram type
Patent
1999-04-23
2000-11-07
Freay, Charles G.
Pumps
Intensifier
Ram type
F04F 702
Patent
active
061427462
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an improved hydraulic ram pump device.
BACKGROUND OF THE INVENTION
Hydraulic ram pump devices are known in the art. Such pump devices typically comprise a supply tube for receiving a liquid with a relatively low head, an accumulator connected to the supply tube via a one-way valve, an outlet tube from the accumulator for producing liquid with a relatively high head. An outlet valve, provided at an outlet of the supply tube, after the accumulator, outlet opens and shuts the outlet at the supply tube. Such hydraulic ram pumps have long been known in the art.
In such a Prior Art design, the outlet valve may be provided with a float, which is closed at a certain liquid flow, and opened again when the liquid flow has ceased. Such a pump operates well as long as the liquid fed, usually water, is free from impurities. Even small impurities may, however, disturb the operation of such an outlet valve, whereby the pump device of this type ceases to operate.
Thus there remains in the art a demand for hydraulic ram pump devices which are not disturbed by a reasonable amount of impurities in the actual liquid, and this have a reliable function and are simple in design and thus cheap in manufacture.
SUMMARY OF THE INVENTION
According to the present invention, such a hydraulic ram pump device is characterized in that the outlet valve comprises a damper movable between a first position, in which the opening is left open, and a second position, in which the opening is closed. The pump device according to the invention may be designed in various ways within the spirit and scope of the present invention. In one embodiment, the damper may be arranged to rotate around a first axis and is provided with an adjustable first weight which provides a torque acting in the direction towards the first open position of the outlet valve, and thus influences the time interval between opening and closing of the outlet valve.
In a second embodiment, which is particularly advantageous if the supply tube feeds liquid with a relatively low head, a vessel is provided, cooperating and coupled to the outlet valve. The vessel is movable between a first position and a second position. When the vessel is in the first position, the outlet valve is held open. The vessel collects flowing liquid from the outlet until the weight of the collected liquid brings the vessel to the second position in which the outlet valve is held closed.
Liquid then flows out of the vessel, and the reduction in weight allows the vessel to return to its first position. The vessel may be provided with a second variable weight, which provides a torque in the direction towards the first position of the vessel, and thus influences the time interval between the open and closed positions of the outlet valve.
The cooperation and coupling of the outlet valve with the vessel can be carried out in different ways. For example, the damper may be fixed to the vessel. In this case, a bow bar may be fixed to the vessel, provided to guide liquid, flowing from the outlet, to the vessel.
In another embodiment. where the damper is fixed to the vessel, a paddle wheel may be provided in such a way, rotatably mounted to a frame, such that liquid flowing from the outlet causes the paddle wheel to rotate and thereby transport the liquid into the vessel.
In order to achieve safe operation, it is possible, in one advantageous embodiment of the pump device of the present invention, to provide a vessel with a relatively small outlet opening to be filled with overflowing liquid and arranged to act, in an emptied condition, upon the outlet valve in the direction towards its open position. It is not necessary to fix the damper to the vessel in such an embodiment.
In yet another embodiment, the damper may be provided to pivot around a second axis between open and closed positions, and the vessel may be provided with a first element, such that when the vessel moves from the first position to the second position it acts upon a second element at th
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Bell Robert P.
Evora Robert Z.
Freay Charles G.
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