Patent ID: 8955339
Filing Date: 2015-02-17
Classification: F04B

Abstract:
1. An apparatus for preventing a memory effect in cryogenic pumps, comprising: a two-stage device comprising a first cooling stage and a second cooling stage that adjoins the first cooling stage in an axial direction; a cylindrical shield with an opening and a base, the base penetrated centrally by the two-stage device in such a way that the first cooling stage is arranged outside the cylindrical shield and the second cooling stage is arranged within the cylindrical shield, and an intermediate space is formed between the cylindrical shield and the first cooling stage, and the base of the cylindrical shield is connected in a thermally conductive manner to the first cooling stage by a thermal bridge, the thermal bridge positioned between the cylindrical shield and the first cooling stage at a distance from an end side of the first cooling stage; a cooling panel providing a pumping surface area, the cooling panel connected to the second cooling stage and positioned within the cylindrical shield; and a baffle arranged proximate the opening of the cylindrical shield and in thermally conductive contact with at least one of the cylindrical shield and the first cooling stage.