In rotary compressors, adding one cylinder to the conventional two in the axial direction without increasing the flow rate and load per cylinder can be expected to be an effective means for further increasing the capacity without deteriorating efficiency and reliability. This paper presents the prototype design with three different specifications for a three-cylinder rotary compressor, their performance measurement results, and their efficiency analysis. To investigate a bending deformation of the crankshaft, we have performed an axis behavior analysis as the elastic body and used the results for the efficiency analysis. Our efficiency analysis finds that the three-cylinder rotary compressor requires a middle bearing between the cylinders to reduce leakage in the compression chamber. The three-cylinder prototype demonstrates a higher COP than two-unit operation of the two-cylinder conventional models in almost the entire refrigeration capacity range and a great advantage in the medium capacity range especially.

在旋转式压缩机中，在不增加每缸流量和负荷的情况下，在传统的两个气缸的轴向上增加一个气缸，有望成为一种有效的手段，可以在不降低效率和可靠性的情况下进一步增加容量。本文介绍了三缸旋转压缩机的三种不同规格的原型设计、性能测量结果和效率分析。为了研究曲轴的弯曲变形，我们进行了作为弹性体的轴行为分析，并将结果用于效率分析。我们的效率分析发现，三缸回转式压缩机需要在气缸之间安装中间轴承，以减少压缩室的泄漏。