Regenerator for cryo-cooler with helium as working gas, method for producing such regenerator, and cryo-cooler comprising such regenerator
A technology of working gas and regenerator, applied in the direction of gas circulation refrigerator, refrigerator, refrigeration and liquefaction, etc., can solve the problems of expensive, complex structure, shortened service life of cryogenic cooler, etc., to increase heat storage capacity, improve storage The effect of heat capacity
Active Publication Date: 2019-07-23
PRESSURE WAVE SYST
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Problems solved by technology
However, the structure of this regenerator is complex and expensive, and there is a risk that some of the adsorbent material may be entrained and blown away by the working airflow
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[0092] figure 1 with figure 2 A first embodiment of the regenerator 1 according to the invention is shown, the simplest form of the regenerator 1 being shown. The regenerator 1 is composed of a unit 2 comprising a unit wall 4 and a cavity 6 enclosed by the unit wall 4 . The cell wall 4 has an outer side 4a and an inner side 4i. The cell wall 4 is pierced by a pressure equalization opening in the form of a capillary 8 . The regenerator 1 has an annular cross-sectional shape, and is arranged in a tubular flow channel 10 for passing helium working gas. The interior of the cavity 6 is filled with helium, either as a regeneration medium or as a heat storage medium. The regenerator 1 and / or unit 2 is dimensioned such that between the tubular flow channel 10 through which the working gas flows and the outer side 4a of the unit wall 4 an annular gap 12 is formed. Therefore, the helium working gas can flow around the regenerator 1 and pass through the heat conduction unit wall 4...
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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 compoundsin the 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 the known closed hollowbody 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, theregenerator 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 hollowcavity (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 aspossible.
Description
technical field [0001] The invention relates to a regenerator (according to claim 1) for a cryogenic cooler with helium as working gas, to a method for producing such a regenerator (according to claims 16 and 17) and to providing a regenerator comprising such a regenerator cryogenic cooler (according to claim 18). Background technique [0002] Operation of regularly operated cryogenic coolers such as Stirling coolers, Gifford McMahon (GM) type coolers, or other pulse tube coolers in the regenerator mode can take advantage of the Thermal capacity to store cold and / or pre-cool hot gases entering the expansion chamber. But the problem with this kind of operation is that the heat capacity of almost all materials drops dramatically in the temperature range from 2K to 20K. Therefore, it is difficult to find materials with a sufficiently high heat capacity in the temperature range between 2K and 20K. Figure 13 A typical configuration of a two-stage pulse tube cooler is shown in ...
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IPC IPC(8): F25B9/14
CPCF25B9/14F25B2309/003F25B9/145F25B2309/1408F25B2309/1415F25B2309/002
Inventor 延斯·赫内
Owner PRESSURE WAVE SYST