30 August 2004 Dynamically counterbalanced pneumatically driven expander of a split Stirling cryogenic cooler
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Low vibration Stirling cryocoolers, which find use in numerous vibration sensitive electronic and electro-optic applications, typically comprise a dual-piston linear compressor and a pneumatically driven expander. While such compressors have inherently low level of vibration export, the unbalanced motion of the displacer-regenerator of the traditional expander inevitably leads to an essential vibration export into the supporting structure to which the cryogenic cooler is normally rigidly attached. The authors report on the novel approach to a passive cancellation of vibration export from a pneumatically driven displacer of a split Stirling cryogenic cooler. This patent pending technique relies on the principle of dynamic counterbalancing, where an auxiliary movable mass is flexibly attached to a hot part of the movable displacer-regenerator assembly and to the stationary expander casing using two auxiliary mechanical low-damped springs. A theoretical analysis yields the simple condition of canceling the fundamental component of vibration export at the same power consumption and cooling performance. The authors successfully attempted to redesign the existing expander of the Stirling Ricor model K535 cryocooler, where the vibration export at the driving frequency was reduced 150-fold under typical thermal loading at the same power consumption.
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Alexander M. Veprik, Alexander M. Veprik, Sergey V. Riabzev, Sergey V. Riabzev, Nachman Pundak, Nachman Pundak, } "Dynamically counterbalanced pneumatically driven expander of a split Stirling cryogenic cooler", Proc. SPIE 5406, Infrared Technology and Applications XXX, (30 August 2004); doi: 10.1117/12.542069; https://doi.org/10.1117/12.542069

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