| 摘要 |
A heat machine having an external heat source and an external heat sink may be configured as a Stirling engine having a hot pair of cylinder-and-displacer combinations (15) and a cold pair of cylinder-and-displacer combinations (16) though advantageously two pairs of hot combinations (15) and two pairs of cold combinations (16) are provided, arranged mutually at right angles. Mechanisms (20) associated with the hot and cold displacers controls the movement thereof to be truly sinusoidal and are contained within casings (21). The pressure in the working fluid spaces remote from the mechanisms (20) and also the pressure in the casings (21) is monitored and compared, and then is controlled such that the casing pressure is slightly less than the minimum working fluid pressure in the working fluid spaces. The relative phase of the two mechanisms (20) associated respectively with the hot displacers and the cold displacers is adjustable (28,29,30,31; and Figure 4). |
