Injection Apparatus for Cryogenic Engines
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United States of America Patent
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Issued Date -
Sep 18, 2008
app pub date -
Jun 30, 2006
filing date -
Jul 1, 2005
priority date (Note) -
Abandoned
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Abstract
Injection apparatus is provided for injecting a drive fluid, such as liquefied nitrogen, into the working chamber (50) of a cryogenic engine. Liquefied nitrogen is admitted to a housing (36) of the apparatus under the control of an inlet valve (42) and expelled from the housing (36) under the control of an outlet valve (48). In the housing (36), heat is transferred to the liquid nitrogen to cause a small volume of the liquefied nitrogen to boil and thereby inject the drive fluid into the cryogenic engine under pressure. In each of two embodiments (FIGS. 1 to 7) the liquid nitrogen is transferred to a warmed region of the housing by a moveable injection member (4, 20) and in two further embodiments the housing is formed as a heat exchanger through which the nitrogen passes.
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