Patents Assigned to Pressure Wave Systems GmbH
  • Patent number: 12179206
    Abstract: A cryostat with improved accessibility for experiments includes a cooling device, a vacuum chamber and multiple cooling levels, heat shields and experimentation places. The cooling device is thermally coupled to cooling levels that have different temperatures. The experimentation places are at the temperatures of the cooling levels and are arranged side by side when viewed from above such that each experimentation place is accessible from above and from the side. Each cooling level has an associated heat shield that also encloses an experimentation place. The vacuum chamber encloses the cooling levels. The cold plate of a second cooling level is arranged above the cold plate of a first cooling level such that a portion of the first cold plate protrudes laterally from under the second cold plate. An experimentation place is disposed above the protruding portion of the first cold plate and is accessible from above and from the side.
    Type: Grant
    Filed: September 13, 2021
    Date of Patent: December 31, 2024
    Assignee: Pressure Wave Systems GmbH
    Inventor: Jens Hoehne
  • Patent number: 11333406
    Abstract: A regenerator of a cryo-cooler uses helium both as a working gas and as a heat storage material. The regenerator includes cells whose exterior sides form flow channels through which the working gas flows. Each cell has connected first and second cavities enclosed by a heat-conductive cell wall. The cavities contain helium that is used to store heat. Each cells is shaped as a disk. The working gas flows both through the flow channels and around the regenerator so as to exchange heat with the helium in the cavities via the heat conducting cell wall. Each cell has a pressure-equalizing opening through the cell wall whose diameter is smaller than the thickness of the cell wall. The diameter of the pressure-equalizing opening is dimensioned to permit the pressure of the helium contained in the cell to change by a maximum of 20% during any working cycle of the cryo-cooler.
    Type: Grant
    Filed: June 8, 2019
    Date of Patent: May 17, 2022
    Assignee: Pressure Wave Systems GmbH
    Inventor: Jens Hoehne
  • Patent number: 11231029
    Abstract: A compressor device that periodically supplies compressed working gas to a cooling device loses less gas by not using a rotary valve. The compressor device includes a compressor chamber, a working gas connection, a working liquid connection, a pump, a compensation container and a membrane that is airtight and liquid-tight. The membrane divides the compressor chamber into a first volume containing a working gas and a second volume containing a working liquid. The working gas connection is coupled to the first volume, and the working liquid connection is coupled to the second volume. The pump periodically pumps the working liquid through the working liquid connection and into the second volume and as a result periodically compresses the working gas in the first volume. The membrane is constructed as a balloon or a bellows that surrounds the first volume. The compensation container contains working liquid and is connected to the pump.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: January 25, 2022
    Assignee: Pressure Wave Systems GmbH
    Inventor: Jens Hoehne
  • Patent number: 11028841
    Abstract: Pulse tube coolers and Gifford-McMahon coolers are used to cool nuclear spin tomographs and cryopumps. To supply cooled working gas, gas compressors and in particular helium compressors are used with rotational or rotary valves. The rate at which compressed helium is introduced into the cooling device and let out again lies in the range of 1 Hz. A problem of conventional screw or piston processors is that oil from the compressor mixes with the working gas and thus contaminates the cooling device. By providing a second compressor stage, a common pump device can be used to pump in both directions, which results in a two-stage compressor device. The working gas is compressed in each flow direction of the working liquid, in one flow direction in the first compressor stage and in the opposite flow direction in the second compressor stage. Thus, the efficiency of the compressor device is improved.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: June 8, 2021
    Assignee: Pressure Wave Systems GmbH
    Inventor: Jens Hoehne
  • Patent number: 10578099
    Abstract: A compressor device that periodically supplies compressed working gas to a cooling device loses less of the gas by not using rotary valves. The compressor device includes a compressor cylinder, a compensation container and a drive device with an hydraulic cylinder. The compressor cylinder includes a compressor element, such as a piston or membrane, that divides the compressor cylinder into first and second volumes. The first volume contains the gas that is compressed by the compressor element. The hydraulic cylinder has a piston that is coupled to the compressor element. The compensation container contains compensation fluid and is directly connected to the second volume. The compensation container is also connected to the first volume by a gas line with a non-return valve that opens in the direction of the first volume. The drive device allows the compressed gas to be provided at a frequency required for Gifford-McMahon and pulse-tube coolers.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: March 3, 2020
    Assignee: Pressure Wave Systems GmbH
    Inventor: Jens Hoehne
  • Publication number: 20140147296
    Abstract: A compressor device that periodically supplies compressed working gas to a cooling device loses less of the gas by not using rotary valves. The compressor device includes a compressor cylinder, a compensation container and a drive device with an hydraulic cylinder. The compressor cylinder includes a compressor element, such as a piston or membrane, that divides the compressor cylinder into first and second volumes. The first volume contains the gas that is compressed by the compressor element. The hydraulic cylinder has a piston that is coupled to the compressor element. The compensation container contains compensation fluid and is directly connected to the second volume. The compensation container is also connected to the first volume by a gas line with a non-return valve that opens in the direction of the first volume. The drive device allows the compressed gas to be provided at a frequency required for Gifford-McMahon and pulse-tube coolers.
    Type: Application
    Filed: January 30, 2014
    Publication date: May 29, 2014
    Applicant: Pressure Wave Systems GmbH
    Inventor: Jens Hoehne