Pumps – By heating of pumped fluid
Patent
1977-09-02
1979-01-02
Croyle, Carlton R.
Pumps
By heating of pumped fluid
60520, 417375, F04B 1924
Patent
active
041325052
ABSTRACT:
A thermocompressor is disclosed as including a free piston which coasts upwardly and downwardly in a bypass region of a cylinder between cold and hot rebound chambers at cold and hot ends of the cylinder located at the top and bottom of the cylinder. A compressible fluid alternately flows downwardly and upwardly between the cold and hot cylinder ends via the cylinder bypass in response to the alternate upward and downward coasting of the piston. This alternate fluid flow, in conjunction with a thermal lag heating chamber, regenerator, and cooling chamber, causes an alternate heating and cooling of the fluid which produces a cyclical fluid pressure variation utilizable for driving a load. Although the regenerator, and generally the cooling chamber, are located in the bypass, the thermal lag heating chamber is located beyond the bypass and communicates separately with the lower or hot end of the cylinder for thermal lag driving of the piston during a hot rebound portion of the cycle. During the upward coasting of the piston, fluid is directed out of the hot end of the bypass in a substantially defined stream which flows through a portion of the volume of the hot cylinder end and thence into the heating chamber via a heating chamber inlet port and inlet conduit, thereby producing the required heating during coasting. The inlet port is positioned within the cylinder and very close to the lower or hot end of the bypass for capturing substantially all of the above-mentioned stream of fluid substantially independently of the choice of fluid. The lower or hot end of the free piston is concavely shaped such that it does not strike or undergo substantial frictional contact with the cylinder end-wall defining the inlet port and inlet conduit even though the lower edge of the piston moves below the port during the hot rebound.
REFERENCES:
patent: 3274795 (1966-09-01), Fowle et al.
patent: 3767325 (1973-10-01), Schuman
patent: 3782859 (1974-01-01), Schuman
patent: 3807904 (1974-04-01), Schuman
patent: 4012910 (1977-03-01), Schuman
patent: 4072010 (1978-02-01), Schuman
Croyle Carlton R.
Smith Leonard E.
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