Power plants – Motor operated by expansion and/or contraction of a unit of... – Unit of mass is a gas which is heated or cooled in one of a...
Reexamination Certificate
2000-03-06
2001-11-13
Nguyen, Hoang (Department: 3748)
Power plants
Motor operated by expansion and/or contraction of a unit of...
Unit of mass is a gas which is heated or cooled in one of a...
C060S520000
Reexamination Certificate
active
06314731
ABSTRACT:
The present invention relates to a thermal machine as defined in the preamble of claim
1
.
A thermal machine functioning in accordance with the closed Camot cycle process can be used as an engine or as a refrigerating machine depending on whether the machine is started using thermal energy or mechanical energy. The working gas is contained in a closed system in the machine.
To produce useful thermodynamic processes, the gas undergoes in the various chambers in the machine the phases of compression, transfer, expansion and restoration to the original state. The efficiency of the machine depends on its phasing precision. To implement the phase shift between the pistons, e.g. a rhombic crank mechanism functioning with two crankshafts and a lever mechanism has been developed.
Prior art engines have the drawback that, in respect of pressure-volume cycles, they differ considerably from the theoretically most advantageous values or that they are complicated. Moreover, in engines provided with a complicated rhombic crank mechanism, the cyclic phasing is inaccurate.
The object of the present invention is to achieve a new type of thermal machine that is free of the drawbacks described above. To implement this, the thermal machine of the invention is characterised by what is presented in the characterisation part of claim
1
.
The advantages of the invention can be regarded as consisting in the nearly ideal phasing of pressure-volume cycles, small mechanical losses and relatively simple structure. With the solution of the invention, and accurate phasing of the cycle process is achieved by using a “stretched” top dead position of the pistons. In addition, the built-in power regulating circuit of the invention is simple to implement.
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Nguyen Hoang
Volpe & Koenig P.C.
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