Pumps – Expansion and contraction of pump fluid
Patent
1987-06-22
1988-12-20
Smith, Leonard E.
Pumps
Expansion and contraction of pump fluid
417209, F04B 1924
Patent
active
047922834
ABSTRACT:
A heat-driven pump for performing the transport of liquid by the function of bubbles produced by vaporization and condensation of the liquid under heating includes an inlet pipe, an inlet-side check valve, a charging pipe, a bubble forming portion, a discharging pipe, an outlet-side check valve, and an outlet pipe. The bubbles forming portion includes a heating portion for receiving heat supplied from outside, a liquid cavity formed in the heating portion having a cross-sectrion which is reduced along the longitudinal axis of the heating portion, and a vapor-liquid exchange chamber communicated with the liquid cavity and having a volume greater than the volume of a bubble extruded from the liquid cavity. In this heat-driven pump, a bubble is generated and expanded in the liquid cavity by heat received by the heating portion, a discharge of liquid is carried out by the expansion of the bubble, an introduction of new liquid into the liquid cavity is carried out by extrusion of the bubble into the vapor-liquid exchange chamber, and elimination of the bubble is carried out by a cooling of the heating portion, and accordingly, a successive pumping of liquid is carried out.
REFERENCES:
patent: 2914217 (1959-11-01), Warhus
patent: 2953100 (1960-09-01), Andrews
patent: 4212593 (1980-07-01), Wilhite
patent: 4625790 (1986-12-01), Okayasu
Meller Michael N.
Smith Leonard E.
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