Pumps – Intensifier – Ram type
Reexamination Certificate
1998-09-03
2001-05-22
Yuen, Henry C. (Department: 3747)
Pumps
Intensifier
Ram type
C417S065000
Reexamination Certificate
active
06234764
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a hydraulic ram pump for converting low amounts of water at high pressure into large amounts of water at low pressure. Such ram pumps are also designated suction rams. Rams denote ram pumps which can be used in reverse for the conversion of large amounts of water at low pressure into low amounts of water at high pressure. The ram pump according to the invention can do both, that is to say it can optionally be used to increase pressure or to increase volume flow.
Suction rams have been known at least since 1905 (“Trägheitsmaschinen als Möglichkeit der hydraulisch-mechanischen Energieumformung” [Inertial machines as an option for hydraulic-mechanical energy conversion], presentation by Ivan Cyphelly, Fegawerk/Switzerland, held at the IHP of RWTH Aachen, Prof. Backé, Jun 21, 1991). They employ a ram valve which, as in the case of the hydraulic rams having a propulsion water pipe and a natural drop, is abruptly closed by the hydrodynamic pressure drop which is produced by the water flowing through the valve.
In the case of known suction rams (for example German Patent No. 804,288, 1949, or in the case of the suction ram still built today by the company Fegawerk S. A., Le Locie/Switzerland), when the ram valve closes the kinetic energy of the flowing water in the propulsion water line is dissipated, because the propulsion water is stopped. In order to keep this loss as small as possible, the suction ram from Fegawerk has as the propulsion water line a hose having an extremely large cross section, by which means high velocities of the propulsion water are additionally avoided.
The above-mentioned known suction rams require a specific constant propulsion water volume flow for satisfactory functioning, since when the propulsion water volume flow falls below that needed, the ram pump valve no longer closes and the efficiency falls to zero.
The ram valve is exposed to a particularly high loading as a result of the abrupt stopping of the propulsion water column, this loading being still considerably higher in known suction rams than in conventional hydraulic rams in which, as the result of the stopping of the propulsion water column, the pressure which is backed up at the valve is only that which must be achieved in order to deliver into an air receiver. This high loading on the ram pump valve has an unfavorable effect on the lifetime of the known suction ram.
These disadvantages are overcome by the ram pump described in the German Patent Application DE 19520343, which is not a prior publication (EPC Art. 54(3)), according to which the ram pump valve is not formed as a nonreturn valve, as in the previously mentioned prior art, which is held open by spring force and closed by the propulsion water flow, but as a valve which is held closed by spring force and opened by the propulsion water pressure.
SUMMARY OF THE INVENTION
Furthermore, according to the invention, provision is made to actuate the ram pump valve cyclically in the manner of an oscillatory circuit in cooperation with a pressure reservoir element which is likewise acted on by the propulsion water. Because of its construction, this suction ram can operate both to increase pressure and also to increase volume flow.
Since in the case of this ram pump the propulsion water pressure is taken up, before the opening of the ram pump valve, by the pressure-adjustable element of a pressure reservoir element, it is ensured that the propulsion water is not stopped abruptly when the ram pump is operating but rather can be fed to the latter continuously, by which means the ram pump valve is distinctly relieved of load in comparison with the prior art, which is to the benefit of the lifetime of the ram pump as a whole.
By means of the construction of the ram pump valve of this ram pump as a closing valve, and its driving by the propulsion water in conjunction with a pressure reservoir element, it is furthermore achieved that the ram pump valve still opens even at the smallest propulsion water volume flow, since the opening pressure for the ram pump valve is built up by the pressure reservoir element even given a minimal propulsion water flow. This therefore also achieves a distinct increase in the efficiency of the ram pump in comparison to the suction ram treated above.
Further details of this ram pump are explained in more detail below using
FIGS. 1 and 2
of the drawing, according to which:
REFERENCES:
patent: 5725 (1848-08-01), Leighton
patent: 4054399 (1977-10-01), Maurer
patent: 4073604 (1978-02-01), Chen
patent: 307348 (1916-10-01), None
patent: 1952034 A1 (1995-12-01), None
Gimie Mahmoud
Hedman & Costigan
Yuen Henry C.
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