BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view showing the basic principle of a general air cycle;
FIG. 2 is a graph showing the relation of T-s of the general air cycle;
FIG. 3 is a sectional view showing a conventional air compressor and expander;
FIG. 4 is a perspective view showing a first rotor in the conventional air compressor and expander;
FIG. 5 is a perspective view showing an air compressor and expander according to a first embodiment of the present invention;
FIG. 6 is a side view showing first and second rotors of the air compressor and expander according to the first embodiment of the present invention;
FIG. 7 is a sectional view showing the air compressor and expander according to the first embodiment of the present invention;
FIG. 8 is a sectional view taken along the line A-A of FIG. 7;
FIG. 9 is a perspective view showing an air compressor and expander according to a second embodiment of the present invention; and
FIG. 10 is a side view showing first and second rotors of the air compressor and expander according to the second embodiment of the present invention.