介绍了一种高效、双容量、三缸、往复式活塞、密封压缩机的研制。获得专利的容量调节概念在曲柄销和连杆之间采用偏心钻孔圆柱凸轮，当曲轴旋转方向发生变化时，该凸轮可改变压缩机的冲程。产生高效率的补充设计特征包括（1）冷却驱动电机和压缩机并将热量排出压缩机外壳外部的循环油系统，（2）将气体导入气缸以阻止传热的吸入管道系统，（3）阻止传热并减少压力损失的排放管道方案，（4）改进后的阀门和阀板系统，降低了流动阻抗，并与凸形活塞结合使用，减少了间隙容积，从而提高了容量和效率；（5）高性能- 效率高，双强度驱动电机（此处未详细说明）。引文:研讨会论文，佐治亚州亚特兰大，1984年

The development of a high-efficiency, two-capacity, three-cylinder, reciprocating-piston, hermetic compressor for the advanced electric heat pump is described. The patented capacity-modulation concept employs an eccentrically bored circular cylinder cam between crankpin and connecting rod, which acts to change the stroke of the compressor upon a change in the direction of rotation of the crankshaft. Complementary design features that result in high efficiency include (1) a circulating oil system that cools the drive motor and the compressor and rejects heat external to the compressor shell, (2) a suction piping system that routes gas into the cylinders in a manner to impede heat transfer, (3) a discharge piping scheme that impedes heat transfer and reduces pressure loss, (4) an improved valve and valve plate system that reduces flow impedance and in conjunction with a crowned piston reduces clearance volume, thereby improving both capacity and efficiency, and (5) a high-efficiency, dual-strength drive motor (not detailed here).