Patents by Inventor (Lars) Lauritz B. Schibbye

(Lars) Lauritz B. Schibbye has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4498849
    Abstract: The invention relates to a valve arrangement for capacity control of an oil-injected screw compressor. One or more piston valves are arranged one after the other in the axial direction of the rotors at the portion of the rotor barrels where the internal compression phase occurs. The compressor control valves are actuated by the discharge pressure, which in their turn open or close the piston valves. When the piston valves are open, a portion of the gas in the compression space is discharged to a bleed off passageway and it flows back to the inlet port of the compressor so that substantially no compression work is spent on this portion of the gas.
    Type: Grant
    Filed: September 14, 1983
    Date of Patent: February 12, 1985
    Assignee: Sullair Technology AB
    Inventors: (Lars) Lauritz B. Schibbye, Rolf A. Englund
  • Patent number: 4462769
    Abstract: This invention relates to a method at oil-injected screw-compressors for balancing axial forces at at least one of the rotors of the compressor, for sealing the gaps between rotor housing and rotor shafts and for cooling and lubricating the bearings of the rotor shafts. At the high-pressure end of the compressor oil under pressure of such magnitude is supplied to the bearing spaces (28a,28b) at the ends of both rotors that an oil flow inward to the compression space along the gaps (32a, 32b) between the rotor shafts and the rotor housing is obtained for sealing against leakage from the compression space. Oil at this pressure further is supplied via a connection (42) from the bearing space (28b) of the female rotor to a pressure space (38) at the low-pressure end of the female rotor for balancing the axial force arising on the shaft end (31) of the female rotor on the high-pressure side due to the oil supplied to the bearing space (28b) of the female rotor.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: July 31, 1984
    Assignee: Sullair Technology AB
    Inventors: (Lars) Lauritz B. Schibbye, Rolf A. Englund
  • Patent number: 4452575
    Abstract: This invention relates to a method and a device for intermediate cooling in an oil-injected multi-stage screw compressor. Between the outlet (14) in one stage (10) and the inlet (16) in a subsequent stage (11) a connecting passageway (15) is located, through which the gas compressed in the firstmentioned stage (10) is supplied to the subsequent stage (11). For cooling the gas flowing out from the firstmentioned stage (10), in the connecting passageway (15) at least one nozzle (19) is located for the supply of a large cooling oil amount.
    Type: Grant
    Filed: March 12, 1982
    Date of Patent: June 5, 1984
    Assignee: Svenska Rotormaskiner AB
    Inventors: (Lars) Lauritz B. Schibbye, Jan Johansson
  • Patent number: RE32055
    Abstract: This invention relates to a method at oil-injected screw-compressors for balancing axial forces at at least one of the rotors of the compressor, for sealing the gaps between rotor housing and rotor shafts and for cooling and lubricating the bearings of the rotor shafts. At the high-pressure end of the compressor oil under pressure of such magnitude is supplied to the bearing spaces (28a,28b) at the ends of both rotors that an oil flow inward to the compression space along the gaps (32a,32b) between the rotor shafts and the rotor housing is obtained for sealing against leakage from the compression space. Oil at this pressure further is supplied via a connection (42) from the bearing space (28b) of the female rotor to a pressure space (38) at the low-pressure end of the female rotor for balancing the axial force arising on the shaft end (31) of the female rotor on the high-pressure side due to the oil supplied to the bearing space (28b) of the female rotor.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: December 24, 1985
    Assignee: Sullair Technology AB
    Inventors: (Lars) Lauritz B. Schibbye, Rolf A. Englund