Open Source, 3D-Printed TrapGuard to Protect Oil-Sealed Vacuum Pumps from Cold Trap Warming

Clean pump oil is critical to the performance and longevity of oil-sealed vacuum pumps. Cold traps charged with cryogens can protect pump oil from solvent contamination but are subject to operator error. Notably, cold traps with evaporated or warmed cryogens do not protect the vacuum pump. Here, we report an open source device to automatically protect oil-sealed vacuum pumps from cold trap warming and facilitate the daily maintenance of cold traps.清洁的泵用油对于油封式真空泵（oil-sealed vacuum pumps）的性能与使用寿命至关重要。装填有致冷剂（cryogen）的冷阱（cold trap）可保护泵用油免受溶剂污染，但易因操作人员操作失误失效。值得注意的是，当致冷剂蒸发或升温后，冷阱将无法为真空泵提供有效防护。本文报道一款开源装置，可自动为油封式真空泵规避冷阱升温导致的防护失效风险，并简化冷阱的日常维护工作。