| 摘要 |
A Stirling cooler made up of a first cylinder and a second cylinder. The first cylinder includes a driven piston for maintaining reciprocal gas displacement by compressing a gas in a closed cycle. The second cylinder is in fluid communication with the, first cylinder through a conduit which has a heat rejector in thermal contact with it, for rejecting heat from the second conduit. The second cylinder is made up of a displacer, an expansion chamber and a regenerator. The displacer normally oscillates within the second cylinder in response to gas pulses received through the conduit. The expansion chamber is at a first extremity of the second cylinder. The expansion chamber is cooled by the gas at the first extremity of the second cylinder. The piston is driven by means which drive the piston at a speed required for normal cooling generation resulting in displacer oscillation being less than 90 degrees out of phase with the piston. The piston is also driven by means for selectively driving the piston at a speed above the resonant frequency of the displacer to cause the displacer oscillation to be out of phase with the piston by more than 90 degrees for the generation of heat in the expansion chamber.
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