Patents by Inventor Benjamin F. Hesler

Benjamin F. Hesler 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: 4404811
    Abstract: A method of regulating startup operation of a vapor compression refrigeration system to prevent oil pump cavitation during startup of the refrigeration system is disclosed. The method comprises monitoring the rate of decrease in evaporator pressure or temperature or monitoring compressor suction line pressure and then comparing this monitored rate to a rate of pressure or temperature decrease which is predetermined to prevent oil pump cavitation. If the monitored rate exceeds the predetermined rate control action is taken to adjust the capacity of the compressor to provide a desired rate of pressure drop which prevents oil pump cavitation. A microprocessor control system and a mechanical control system are disclosed for carrying out the disclosed method.
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: September 20, 1983
    Assignee: Carrier Corporation
    Inventors: Gordon L. Mount, Benjamin F. Hesler
  • Patent number: 4399663
    Abstract: A control system for operating a vapor compression refrigeration system to prevent oil pump cavitation during startup of the refrigeration system is disclosed. The control system includes a differential pressure switch which is connected on one side to a reservoir which is in fluidic communication with the refrigeration system evaporator or compressor suction line. The pressure switch is connected on its other side directly to the evaporator or compressor suction line. In operation, the reservoir fills with vaporous refrigerant from the refrigeration system when the refrigeration system is shut down and the vaporous refrigerant flows through a restrictor valve back to the refrigeration system at startup of the refrigeration system. The size of the reservoir and restrictor valve are selected so that the differential pressure switch is activated and a control is generated when too rapid a decrease in evaporator or compressor suction line pressure is detected.
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: August 23, 1983
    Assignee: Carrier Corporation
    Inventor: Benjamin F. Hesler
  • Patent number: 4378199
    Abstract: The fan motor of a variable speed drive for a fan is positioned in response to thermostatic demand and a feedback signal responsive to the position of the variable speed drive. Changing thermostatic demand causes movement of the fan motor until an equilibrium position is reached again.
    Type: Grant
    Filed: November 18, 1981
    Date of Patent: March 29, 1983
    Assignee: Carrier Corporation
    Inventor: Benjamin F. Hesler