Engines driven by liquefied gas

F - Mech Eng,Light,Heat,Weapons – 01 – K

Patent

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Details

F01K 25/10 (2006.01) F01B 9/06 (2006.01) F01B 17/02 (2006.01) F01K 25/06 (2006.01)

Patent

CA 2605294

In an engine driven by liquefied gas, such as liquefied nitrogen or air, inlet means (31, 33) admits drive fluid to an expansion chamber defined by the volume between two relatively movable members (1, 28) guided for movement in a repetitive cycle by guide means (38, 40). The inlet means also allows a heat exchange liquid to be admitted to the chamber in which the liquid is in intimate contact with the drive fluid and gives up heat energy to the expanding drive fluid. The cooled heat-exchange liquid is withdrawn from the chamber, heated and re-circulated to the chamber. Part of said cycle includes a time period during which there is substantially no relative movement between the members (1, 28) and during which the chamber volume is maintained at or close to its minimum volume, the heat- exchange liquid and drive fluid being admitted to the chamber during said time period. This promotes intimate contact and heat-exchange between the drive fluid and the heat-exchange liquid prior to the drive stroke which delivers the shaft power developed by the engine.

L~invention concerne un moteur entraîné par du gaz liquéfié, tel que l~azote ou l~air liquide dans lequel un moyen d~entrée (31, 33) admet le fluide d~entraînement vers une chambre d~expansion définie par le volume entre deux éléments relativement mobiles (1, 28) guidés pour un mouvement dans un cycle répétitif par un moyen de guidage (38, 40). Le moyen d~entrée permet aussi à un liquide d~échange de chaleur d~être admis à la chambre dans laquelle le liquide est en contact étroit avec le fluide d~entraînement et abandonne l~énergie calorifique au fluide d~entraînement d~expansion. Le liquide d~échange de chaleur refroidi est retiré de la chambre, chauffé et recirculé vers la chambre. Une partie dudit cycle comprend une période de temps pendant laquelle il n~y a sensiblement aucun mouvement relatif entre les éléments (1, 28) et pendant laquelle le volume de la chambre est maintenu à ou proche de son volume minimum, le liquide d~échange de chaleur et le liquide d~entraînement étant admis à la chambre pendant ladite période de temps. Cela provoque un contact intime et un échange de chaleur entre le fluide d~entraînement et le liquide d~échange de chaleur avant la course d~entraînement qui délivre la puissance d~arbre développée par le moteur.

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