The Cold Compressor (CC) is used to lower the saturation temperature of liquid helium (LHe) under varying heat load conditions from the application side, i.e. superconducting magnets and cryopumps for large Tokamak machines. The CC is a key component of a typical cold box, attached to the LHe bath, which compresses and transfers the vapor generated during the heat exchange via heat exchangers as well as the flash generated downstream from the Joule-Thomson (JT) valve connected to the cryoplant. The emphasis of the present paper is a conceptual design and performance assessment of the CC. The CC is designed to pump 0.33 kg/sec of 4.2 K saturated helium vapor at a pressure ratio of 1.39; with an off-design range of 0.2–0.5 kg/sec. Operating speeds are between 10 and 25 krpm, with a speed of 17 krpm at the design point. Due to different heat loads from superconducting magnets and cryopumps, different process pressure and flow rates of the CC for large tokamak machines are expected. Hence, as an important component of the CC, the impeller design with blade profile generation has been carried for the higher thermodynamic efficiency of the CC. Characteristics curves of the CC have been obtained at different speed values. Analysis has been carried out using computational fluid dynamics (CFD) tool to analyze various situations during real operation.

冷压缩机 (CC) 用于从应用方面降低不同热负荷条件下液氦 (LHe) 的饱和温度，即用于大型托卡马克机器的超导磁铁和低温泵。CC 是典型冷箱的关键部件，连接到 LHe 槽，通过热交换器压缩和传输热交换过程中产生的蒸汽，以及连接到 LHe 的焦耳-汤姆逊 (JT) 阀下游产生的闪蒸。冷冻设备。本文的重点是 CC 的概念设计和性能评估。CC 设计为以 1.39 的压力比泵送 0.33 kg/sec 的 4.2 K 饱和氦气；非设计范围为 0.2–0.5 kg/sec。运行速度在 10 到 25 krpm 之间，设计点的速度为 17 krpm。由于来自超导磁体和低温泵的不同热负荷，大型托卡马克机器的 CC 的过程压力和流速预计会有所不同。因此，作为 CC 的重要组成部分，为了提高 CC 的热力学效率，采用了带叶片轮廓生成的叶轮设计。已经获得了CC在不同速度值下的特性曲线。已使用计算流体动力学 (CFD) 工具进行分析，以分析实际操作中的各种情况。