Hermetically sealed stirling engine generator
AssigneeStirling Marine Power Limited
InventorRichard A. Lamos
Life of this patent
Estimating the term…
Abstract
A hermetically sealed Stirling engine driven generator system with a rotating generator, self lubricated bearings using PTFE filled polyimide, a fibrous ceramic piston dome, and flame sprayed ceramic and PTFE coating on the pistons, which allow an oil free system. A brushless self starting system is also used as an alternator. A simple working gas pressure control system uses the housing for the generator and the crankcase as a reservoir for working gas allowing a single valve working in conjunction with a small compressor to regulate the pressure of the working gas.
Claims20
A Stirling cycle engine driven generator, said generator being operatively connected to an external load or source, said Stirling cycle driven generator comprising:
- a sealed housing, said housing being filed with a gaseous fluid, said gaseous fluid being pressurized to a pressure above atmospheric pressure;
- a compression piston having a first side and a second side opposite said first side movably mounted within said housing, said compression piston being in sealed engagement with said housing and restricting the passage of said gaseous fluid between said first side of said compression piston and said second side of said compression piston;
- an expansion piston having a first side and a second side opposite said first side movably mounted within said housing, said expansion piston being in sealed engagement with said housing and restricting the passage of said gaseous fluid between said first side of said expansion piston and said second side of said expansion piston;
- a mechanical connection means which connects said second side of said expansion piston and said second side of said compression piston in such a way as to cause oscillatory movement of said expansion piston and said compression piston, the relative movement of said pistons defining a phase angle, said phase angle being essentially 90 degrees;
- said mechanical connection means further containing a rotatably mounted member which rotates in concert with the said oscillatory movement of said pistons;
- a compression space within said housing having one side defined by said first side of said compression piston, said compression space containing a working fluid;
- an expansion space within said housing having one side defined by said first side of said expansion piston, said expansion space containing said working fluid, said working fluid being the same material as said gaseous fluid;
- said expansion space and said compression space being in communicating relationship so as to allow said working fluid to flow between said expansion space and said compression space in response to said oscillatory movement of said expansion piston and said compression piston;
- a cooler in a heat transferring relationship with said working fluid in said compression space;
- a heater in a heat transferring relationship with said working fluid in said expansion space;
- a generator armature rotatably mounted within said housing, said armature connected to said rotatably mounted member of said mechanical connection means;
- a generator stator mounted within said housing in such a way as to act in conjunction with said armature so as to produce electrical current when said armature rotates.
Dependencies are inferred from the claim text.