Pumps – Motor driven – Fluid motor
Patent
1985-11-27
1988-03-22
Croyle, Carlton R.
Pumps
Motor driven
Fluid motor
417380, 417394, F04B 908, F04B 4310
Patent
active
047325470
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for cyclically impelling liquid by means of a supply of gas under pressure for example in the form of compressed air, steam, exhaust gases from an internal combustion engine or combustion gases from a gas generator device.
According to the invention there is provided apparatus for impelling liquid comprising a duct for the liquid, a flexible partition extending from an anchored zone in the downstream direction of the duct, an opening in the wall of the duct for the supply of gas under pressure, the opening being adjacent, and on the downstream side of the anchored region of the partition, a valve member carried by, or formed by part of, the partition and resilient means urging the valve member to close the opening.
With this arrangement, when the gas pressure is sufficient to overcome the bias exerted by the resilient means and lift the valve member, gas is applied against one surface of the partition to deform the latter in a wave-like manner, the wave-like deformation travelling in the downstream direction and thereby causing the other surface of the partition to impel liquid along the duct.
Although the gas pressure at the opening will drop as the valve member moves against the resilient bias to uncover the opening, this reduced gas pressure acts over an area of the partition which is much greater than that of the valve member (i.e. than the area of the opening) and the valve will remain open until the motion of the liquid in the duct allows the gas to travel sufficiently far downstream along the partition to reduce the force exerted by it on the valve member to a value at which the resilient bias can move the valve member to reclose the opening.
Preferably, the partition is capable of deformation between a position in which it substantially conforms to the duct wall and covers the said opening while leaving the duct substantially unobstructed, and a position in which the opening is uncovered so that gas, having attained sufficient pressure to overcome the resilient bias, is directed downstream by the partition while the latter inflates across the duct.
Preferably, the duct is of substantially constant cross-section along its length, being advantageously of circular cross-section.
The anchored zone of the valve member advantageously extends around the full circumference of the duct and may conveniently be at the inlet of the duct. Preferably, the anchored zone of the valve member is oblique with its portion adjacent the opening being furthest upstream.
Preferably, an open work support structure such as a grid is mounted with its periphery adjacent the anchored zone of the partition to act as a support for the partition against deformation against a predetermined configuration under gas pressure.
The partition may extend for substantially the full length of the duct.
The invention will now be further described by way of example with reference to the accompanying drawings, in which:
FIG. 1 is an axial sectional view of a pump in accordance with the invention.
FIG. 2 is a view in the direction of the arrow II of FIG. 1.
FIGS. 3 and 4 each show two stages in the operating cycle of the pump shown in FIG. 1.
FIG. 5 is a longitudinal sectional view of a boooster device for use with the apparatus of FIGS. 1 to 4.
FIGS. 6, 7 and 8 are views similar to FIG. 1 of three forms of apparatus in which the gas is kept separate from the impeller liquid.
FIG. 9 shows a modification of part of FIG. 8 on an enlarged scale.
FIG. 10 shows a modification which can be made to any of FIGS. 1 to 8 for use with higher temperature gas.
FIG. 11 shows a further embodiment in longitudinal section.
FIGS. 12 and 13 are cross section views of a modified form of FIG. 11 on the line X--X thereof.
FIGS. 14 and 15 are diagrammatic section views showing two arrangements for taking exhaust gas from a four-stroke engine to power any of the pumps shown in FIGS. 1 to 13, and
FIG. 16 shows a solar-powered air compressor in axial section.
The pump shown in FIG. 1 is constructed to impel liquid, such as water, alo
REFERENCES:
patent: 3418940 (1968-12-01), Martin
patent: 4427350 (1984-01-01), O'Hare
patent: 4502848 (1985-03-01), Robertson et al.
Croyle Carlton R.
Olds Theodore
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