Patents by Inventor Lars Sjoholm

Lars Sjoholm 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: 4773229
    Abstract: The invention relates to a method for a refrigerant system having a circulation circuit comprising a screw compressor (1), a condenser (4), an expansion valve (5) and an evaporator (6). In a refrigerant process, in which an oil injected compressor is connected it is impossible to prevent oil from flowing together with the refrigerant out into the circulation circuit, which among others impairs the operation of the evaporator. According to the invention a drastic reduction of the amount of circulating oil has been obtained together with an improved cooling of the compressor by supplying the low pressure side of the compressor with refrigerant liquid with a pressure and temperature lower than the pressure and temperature of the refrigerant in the condenser in such amounts per unit of time that the required cooling and sealing of the compressor is obtained, the effect of the circulating oil being restricted merely to lubricating.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: September 27, 1988
    Assignee: Svenska Rotor Maskiner AB
    Inventors: Roland Pamlin, Lars Sjoholm
  • Patent number: 4758136
    Abstract: A screw compressor lubrication channel for lubrication of a rotor bearing on the compressor's low pressure side, which is supplied with refrigerant droplets containing oil accompanying the inlet gas. This kind of lubrication is usually carried out by permitting a limited amount of gas and oil to flow from the high pressure side to the low pressure side via the bearings located on the low pressure side, and further to the inlet. By this working mode compressor capacity as well as compression work deposited is lost. This is avoided when the compressor according to the present invention is provided with a special, smaller inlet channel (7), which via the rotor bearing (3) opens out in a specific inlet port (8) located at an expanding rotor thread presenting a lower pressure than the inlet (6) pressure of the compressor.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: July 19, 1988
    Assignee: Svenska Rotor Maskiner AB
    Inventors: Roland Pamlin, Lars Sjoholm
  • Patent number: D276355
    Type: Grant
    Filed: May 20, 1982
    Date of Patent: November 13, 1984
    Inventor: Lars Sjoholm