Abstract: In order to provide an improved multistage oil separator, in particular for the use with compressors in cryogenics, the oil separator includes a housing (10) having a gas inlet (18) and a gas outlet (20), and at least two filter elements (26, 28) arranged as a cascade in the housing between the gas inlet (18) and the gas outlet (20).

Abstract: In order to provide an improved multistage oil separator, in particular for the use with compressors in cryogenics, the oil separator includes a housing (10) having a gas inlet (18) and a gas outlet (20), and at least two filter elements (26, 28) arranged as a cascade in the housing between the gas inlet (18) and the gas outlet (20).

Abstract: A refrigerator (1) has a housing (2, 14, 19), a cylindrical working chamber (15, 21), a cylindrical displacing member (11, 17), a gap (36, 38) which is located between the housing and the displacing member, a regenerator which is disposed inside the displacing member, and a device alternatingly supplying the working chamber with an effective high-pressure gas and an effective low-pressure gas. In order to overcome the disadvantages associated with gas streams occurring in the gap (36, 38), an additional regenerator (gap gas regenerator), (43) is assigned to the gap (36, 38).

Abstract: A vacuum device comprises a plurality of cryopumps (10), particularly a plurality of cryopumps connected in parallel. Further, at least one compressor device (16) is provided which is connected to the cryopumps (10) via medium supply conduits (12). A medium return conduit (14) is also connected to the compressor device (16) and the cryopumps (10). Arranged between the medium supply conduit (12) and the medium return conduit (14) is a storage container (20) for medium. Further, a pressure measurement device (30) is provided in the medium supply conduit (12). The pressure measurement device (30) is connected, via a control unit (32), to a supply valve (26). To keep the pressure difference at the cryopumps (10) as constant as possible, the supply valve (26) is opened when a threshold value of the pressure in the medium supply conduit (12) is exceeded, thus causing medium to flow into the storage container (20).

Abstract: Normally granulates of rare earth compounds are used as a heat-storing medium for a low-temperature range below 15 Kelvin. The material costs for rare earths are high. Further, rare earths are magnetic and thus not suitable for all applications. The present heat-storing medium for a very low temperature range is composed of a set (22) of pourable and gastight sealed hollow bodies (30). Each hollow body (30) contains a fill (34) of a low-boiling gas as a storing medium. The hollow body wall (32) is made of metal or ceramic. Thus a relatively inexpensive heat-storing medium is provided whose physical, chemical, magnetic and mechanical properties can be adapted to the respective use by corresponding material selection.

Abstract: A refrigerator (1) has a housing (2, 14, 19), a cylindrical working chamber (15, 21), a cylindrical displacing member (11, 17), a gap (36, 38) which is located between the housing and the displacing member, a regenerator which is disposed inside the displacing member, and a device alternatingly supplying the working chamber with an effective high-pressure gas and an effective low-pressure gas. In order to overcome the disadvantages associated with gas streams occurring in the gap (36, 38), an additional regenerator (gap gas regenerator), (43) is assigned to the gap (36, 38).