Pumps – Motor driven – Common pump and motor chamber
Patent
1990-10-23
1992-07-21
Smith, Leonard E.
Pumps
Motor driven
Common pump and motor chamber
60371, 60414, 417394, B63G 836, F04B 910
Patent
active
051318199
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for and a method of managing liquid under pressure.
An object of the invention is to provide a new and improved apparatus for and method of managing liquid under pressure.
According to one aspect of the present invention we provide an apparatus for managing liquid under pressure comprising a first volume adapted to contain liquid at a first pressure, a second volume adapted to contain liquid at a second, lower, pressure and means to receive and store energy derived from said first volume as a result of said first volume containing liquid under said first pressure and use said stored energy to increase the pressure in the second volume.
According to a second aspect of the invention we provide a method of managing liquid under pressure comprising the steps of receiving and storing energy derived from a first volume containing liquid at a first pressure with an energy storage means and subsequently using said stored energy to increase the pressure of liquid in the second volume.
The energy storage means may be adapted to receive and store energy derived from the strain energy of the first volume.
The energy storage means may convert said strain energy to kinetic energy.
Alternatively the energy storage means may transfer strain energy of said volume to a strain energy storage means in said device such as a coil or other spring or a pneumatic accumulator.
The energy storage means may comprise a rotatable energy storage member, means to rotate said member by means of a force derived from said energy of the first volume and means subsequently to cause continuing rotation of the rotatable member to provide a force to pressurise the second volume.
The liquid of the first volume may act on a piston movement of the piston being utilised to rotate the energy storage member.
Said continuing rotation of the energy storage member may move a pressurising piston to cause the piston to impose a pressurising force on the liquid of the second volume.
The pressurising piston may drive the rotatable member through a rack provided on the piston in engagement with a pinion drivingly connected to the rotatable member.
The rotatable member may drive the pressurising piston by virtue of a rack provided on the pressuring piston in engagement with a pinion driven from the rotatable member.
A common rack and pinion may be provided, the rack having at one end a driven piston in driving relationship with the liquid of the first volume and at the other end the pressurising piston in pressurising relationship with the liquid of the second volume.
Alternatively, a piston in driving relationship with the liquid of the first volume may be adapted to move a ball screw in threaded engagement with a drive screw connected to the rotatable member and the pressurising piston may be driven by a similar mechanism and, preferably, a common ball screw and connection to the rotatable member is provided for the two pistons.
Further alternatively, a hydraulic motor may be provided to rotate the rotatable member and a hydraulic motor may be driven by the rotatable member to pressurise the second volume.
Means may be provided to vary the inertia and/or speed of rotation of the rotatable member, for example, by providing the rotatable member in a plurality of parts, the parts being selectively connectable in driving or driven relationship and/or the gear ratio may be changed.
From a more specific aspect the invention relates to an apparatus for and a method of transferring liquid between regions of a first and a second pressure in which a volume is alternated between a first mode in which it is isolated from one of said regions and connected to the other of said regions and a second mode in which it is isolated from said other region and connected to said one region.
Our GB Patent No. 2158889 discloses one such arrangement and whilst the arrangement is economical in terms of the energy consumption required for operation thereof compared with the energy needed to transfer liquid between the regions used in motor driven
REFERENCES:
patent: 4326380 (1982-04-01), Rittmaster
patent: 4741673 (1988-05-01), Jubb
C.D.S.S. Limited
Smith Leonard E.
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