REGENERATOR FOR A CRYO-COOLER WITH HELIUM AS A WORKING GAS, A METHOD FOR PRODUCING SUCH A REGENERAT

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Helium is frequently used as a working gas in cryo-coolers. In the temperature range from 2K to 20K, helium has a comparably high heat capacity which matches the heat capacity of rare earth compounds in said temperature range. Thus, it has been proposed using helium as the regenerator material in closed hollow bodies around which the working gas flows. The main problem with this known closed hollow body with helium consists in the costly process of filling the hollow body with helium under positive pressure. Due to the positive pressure, the wall thickness of the hollow body must be increased, thereby leading to a worsening of the heat transfer resistance. A regenerator is proposed which uses helium as a heat storage material but nevertheless has a simple structure. In the simplest case, the regenerator consists of a hollow cell (2) with heat-conducting cell walls (4). The exterior of the cell walls (4a) at least partly delimits a flow channel (12) for the helium working gas. The hollow cavity (6) is filled with helium as a heat storage material and is connected to the exterior of the cell via a pressure-equalizing opening (8). The helium working gas flows around the can-shaped cell, whereby heat is transmitted between the helium working gas outside of the cavity and the helium within the cavity via the cell walls. The size of the cell(s) in relation to the size of the flow channel of the working gas is selected such that the desired pressure differences between the high-pressure side and the low-pressure side of the regenerator are set with a dead volume which is as small as possible.