A high efficiency dual shell stirling engine

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

Patent

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Details

F01B 25/06 (2006.01) F01B 29/10 (2006.01) F02B 75/04 (2006.01) F02B 75/26 (2006.01) F02B 77/00 (2006.01) F02G 1/044 (2006.01) F23L 15/02 (2006.01) F28D 7/00 (2006.01) F28D 17/00 (2006.01) F28D 17/02 (2006.01) F28F 13/00 (2006.01) F28F 21/02 (2006.01)

Patent

CA 2273931

An improved high-efficiency dual shell Stirling engine is disclosed. The improvements to the engine include: (a) enclosing the high-pressure/high-temperature engine parts within a dual shell (24, 34) filled with an incompressible insulating material (33) such as a liquid salt to increase the operating temperature and pressure; (b) increasing the regenerator efficiency by using an annular graphite regenerator (6) comprising a carbon matrix with increased heat transfer in a direction perpendicular to the working fluid flow; (c) maximizing throttle (28) efficiency by automatically sealing off the dead volume region during a power stroke via a series of controlled ports (40, 41) located around the cylinder (20) and power piston (10); and, (d) limiting working fluid loss by surrounding an inner chamber (15) containing working fluid with an air-filled outer chamber (16) which also encloses the output shaft (29) to minimize the pressure differential across the air seal (31).

L'invention porte sur un moteur Stirling perfectionné à rendement élevé, à double carter. Les améliorations consistent: (a) à entourer les parties à haute pression/haute température du moteur d'un double carter (24, 34) rempli d'un matériau isolant incompressible (33) tel qu'un sel liquide pour augmenter la température et la pression de fonctionnement; (b) à accroître le rendement de régénération en utilisant un régénérateur annulaire de graphite (6) à matrice de carbone assurant un meilleur transfert thermique dans une direction perpendiculaire au flux de fluide moteur; (c) à renforcer au maximum l'efficacité du papillon (28) en isolant automatiquement les zones de volumes morts pendant le temps moteur par l'intermédiaire d'une série de lumières commandées (40, 41) situées autour du cylindre (20) et du piston moteur (10); (d) à limiter les pertes de fluide moteur en entourant la chambre intérieure (15) contenant le fluide moteur d'une chambre extérieure (16) remplie d'air et entourant également l'arbre de sortie (29), de manière à réduire le différentiel de pression sur le joint étanche à l'air (31).

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