Internal-combustion engines – Free piston – Single chamber; one piston
Patent
1997-09-29
1999-06-22
Kamen, Noah P.
Internal-combustion engines
Free piston
Single chamber; one piston
60595, F02B 7100
Patent
active
059132906
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a power unit with a diesel free piston device, a compressor device, a turbine and an electronic device, wherein the free piston device has a cylinder and two pistons movable in anti-phase. The first end sections of the two pistons are adjacent to each other and define a combustion chamber, and the second end sections of the pistons are remote from each other defining end chambers together with the cylinder, the compressor device supplies air to the free piston device via an inlet manifold, the free piston device supplies exhaust gas to the turbine, and the electronic device is arranged to control the pressure of the air in the end chambers in order to control the movement of the pistons.
BACKGROUND OF THE INVENTION
In the applicant's Norwegian application no. 950916 there is disclosed a device of the above-mentioned type, wherein the compressor device is composed of a turbocompressor and the pressure of the air that is supplied to the free piston device's combustion chamber during an air purging sequence substantially corresponds to the compressor device's supply pressure. The energy for operating the compressor can be provided, e.g., by an electric motor that is supplied with electric power from a generator, which in turn is driven by the turbine.
SUMMARY OF THE INVENTION
The object of the invention is to provide a power unit of the type mentioned in the introduction with very high thermal efficiency, but where the temperature of the gas which is supplied to the turbine is relatively low.
The characteristics of the invention are illustrated by the features in the claims presented.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in more detail with reference to the drawing which schematically illustrates embodiments of the unit according to the invention.
FIG. 1 illustrates a pipe arrangement for a first embodiment of a power unit according to the invention, and a longitudinal section through the power unit's free piston device.
FIG. 2 is a view similar to FIG. 1, of a second, simplified embodiment of a unit according to the invention, where the components of the unit have been removed.
FIG. 3 shows a unit with a free piston device which is similar to the unit illustrated in FIG. 2, where the components of the unit have been removed.
DETAILED DESCRIPTION OF THE INVENTION
In the following description, the terms right, left, upper and lower should be understood to indicate positions with reference to the figures as these are viewed by the reader, the terms upper and lower implying positions located close to and remote from the edge of the drawing closest to the reader.
FIG. 1 comprises a longitudinal section through a free piston device or gas generator 10 comprising a cylinder 12 with a first cylinder section 14 located at the cylinder's central section, and second cylinder sections 16,18 located at respective ends of the cylinder 12.
In the cylinder 12 there are slidably provided a left and a right piston 24 and 26 respectively with a first end section 28 and 30 whose diameter is adapted to the first cylinder section 14. Furthermore each piston 24,26 has a piston side section 32 and 34.
Each of the second cylinder side sections 16,18 comprises a second cylinder section 36 and 38 located at the respective ends of the cylinder, and a third cylinder section 40,42 located between the first cylinder section 14 and the second cylinder sections 36 and 38 and that have a larger diameter than these cylinder sections 14,36,38. Between each of the third cylinder sections 40,42 and the first cylinder section 14 and the second cylinder sections 36,38, therefore, there extends an external and an internal radial cylinder wall 60,62 and 64,66 respectively.
Similarly, each of the piston side sections 32,24 comprises a second piston end section 44 and 46 located at the piston ends that are located remotely relative to each other, and a third piston section 48 and 50 located between the first and the second piston end section 28,44 and 30,46 of
REFERENCES:
patent: 2666569 (1954-01-01), Bent
patent: 2815641 (1957-12-01), Ramsey et al.
patent: 4372256 (1983-02-01), Firey
patent: 4481772 (1984-11-01), Benaroya
patent: 4815294 (1989-03-01), David
patent: 4873822 (1989-10-01), Benaroya
Von Prof. Dipl.-lng "Verbrennungskraftmaschinen", 1962, pp. 37-39.
F.o slashed.rde Magnar
Kvamsdal Rolf
Kamen Noah P.
Kvaerner ASA
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