Leybold Aktiengesellschaft

Leybold-heraeus Gmbh

Wilhelm Strasser

Werner Bachler

Hans-Joachim Forth

Hans-Hermann Klein

Axel Veit

Hans-Ulrich Haefner

Manfred Klotz

A refrigerator operating on the Gifford-McMahon principle includes a housing defining a work chamber; a displacement member received in the housing and being movable back and forth between two dead center positions; a regenerator mounted in the displacement member; a piston attached to and extending from the displacement member; a drive cylinder disposed in the housing and being arranged for slidably receiving the piston; an arrangement for introducing a low-pressure working gas and a high-pressure working gas into the drive cylinder and the work chamber for reciprocating the displacement member between its dead center positions; a device for exerting a continuous force on the displacement meber in one of the directions of its reciprocation; and a throttle-containing conduit communicating with the drive cylinder for continuously maintaining either the low-pressure gas or the high-pressure gas in the drive cylinder dependent upon the direction in which the continuous force is oriented.

Vibration-dampening arrangement for a refrigerator operating according

A refrigerator-operated apparatus having a housing adapted to accept components to be cooled. The housing is connected to a refrigerator housing via a connecting pipe, and the refrigerator includes a refrigerator generator extending through the housing and the connecting pipe, and encompassing at least one refrigerator stage that carries the components to be cooled. The apparatus further includes a damping mechanism for inhibiting vibrations generated by the refrigerator from being transmitted to the housing. The damping mechanism includes a separation space dividing the refrigerator housing into first and second connecting sections, and an elastic connecting ring connecting the first section to the second section. In one embodiment, the connecting ring extends across the separation space and is surrounded by a cover tube. In a second embodiment, the connecting ring is secured directly to one of the connecting sections, and is secured to the other connecting section via an adaptor pipe. Detent structure may be provided between the adaptor pipe and one of the connecting sections to cause the connecting ring to be pre-stressed.

Refrigerator-operated apparatus

The invention is directed to a method for manufacturing a cylindrical refrigerator housing (2) of a refrigerator cold head composed of a plurality of parts to be connected to one another. To simplify the manufacturing method and reduce the deterioration of the efficiency of the refrigerator due to the application of heat via the refrigerator housing, it is proposed that at least the housing section (1) of the refrigerator housing (2) that encompasses the cylinder wall is manufactured by a cold-working process, for example by ironing, stretching pressure rolling or deep-drawing.

Method for manufacturing a refrigerator cold head housing

The invention relates to a method for carrying out maintenance work on structural parts located within the housing of a refrigerator, the refrigerator being divided into two parts separable from each other so that the interior chamber of the refrigerator becomes accessible. The method is carried out by opening the housing, carrying out the maintenance work, closing the housing and thereafter sweeping the housing with working gas. In order to avoid condensation in the cold areas of the interior chamber of the refrigerator after the housing is opened, the method provides that the areas of the refrigerator housing endangered by condensations be heated locally to a temperature, which is so selected, that up to and including the sweeping process following the maintenance work, the temperature does not fall below the dew point of condensable gases.

Method for carrying out maintenance work on a refrigerator, device and

The invention refers to an air-cooled compressor assembly for supplying a cryo-refrigerator with helium. The assembly includes a first cooler through which compressed helium flows, another cooler through which operating oil for the compressor flows, and a ventilator. It is suggested that the coolers for helium and oil are located in a separate housing, that the cooler for the helium is positioned upstream of the oil cooler with respect to the air stream generated by the ventilator, and that the compressor housing and the cooler housing are connected with each other via flexible lines.

Compressor assembly for supplying helium to a cryo-refrigerator

A cryostatic temperature regulator having a liquid nitrogen bath. The cryostatic temperature regulator is equipped with a cold head of a refrigerator which is coupled to the cover of the housing of the cryostatic temperature regulator in order to avoid gas losses.

Cryostatic temperature regulator with a liquid nitrogen bath

Method and apparatus for checking the operation of a refrigerator-operator cryogenic pump. The method for checking the operation of a refrigerator-operated cryogenic pump having a cold head with at least one refrigerating unit that is equipped with a pump surface. Various data of the cryogenic pump, particularly the net refrigerating power of the refrigerating unit, are interrogated under various operating conditions and these data are compared to rated data. The method and apparatus are also directed to a diagnostic apparatus with which the interrogation is implemented.

Method and apparatus for checking the operation of a

A throttle valve with a separate flange, usable with a vacuum pump defining an inlet opening, and a controllable throttle assembly for varying a flow passage cross section of the inlet opening. The throttle assembly is disposed in the inlet opening and has a plurality of slats rotatable about respective longitudinal axes for varying their inclination and an actuating rod for turning the slats. The flange has a throughgoing bore through which the actuating rod passes. The slats have a substantially constant width and their longitudinal axes are oriented parallel to one another. The slats form a first and a second slat group, and a linkage connects the slats with one another for turning the slats of the first slat group and the slats of the second slat group in opposite directions. A chamber is situated externally of the inlet opening and communicates with the throughgoing bore. A pivotal lever articulated to the actuating rod is situated in the chamber and projects outwardly therefrom. There is further provided a swingable bellows supported in the chamber and surrounding the pivotal lever for providing an airtight separation of at least one part of the pivotal lever from the chamber.

Controllable throttle for a vacuum pump

The invention relates to a cryopump having a casing (1), a gas inlet opening (8) to which a chamber (30) can be attached through a valve (31), a vacuum pump (18) connected through a valve (16) to the casing, a two-stage refrigerator (4) in the casing as cold source, and pumping surfaces (7, 9, 12, 13) which, on both of the refrigeration stages (5, 11) of the refrigerator, are equipped with an electrical heating means (23, 24). To achieve a great shortening of the time required for regeneration and start-up it is proposed that a sensor (41) be provided to monitor the pressure within the pump casing, and that a control unit (28) be present by which the operation of the cryopump can be monitored and controlled on the basis of the signals supplied by the sensor.

Growing community of inventors

Bergisch Gladbach, Germany

Wilhelm Strasser