Patents Assigned to Pumpex Production AB
  • Patent number: 4212590
    Abstract: A regulator for controlling the speed of a rotary hydrodynamic pump algebraically sums a preselected value with a signal related to the pump speed and raised to a predetermined power. A root of the combined signals is compared with a flow rate or liquid level signal to develop a pump speed control signal. In the mechanical embodiments of the regulator, the algebraic summation is performed by the force of a spring against a fluid pressure, and the root of the resulting signal is obtained by means of an appropriately shaped cam. Electronically, the root signal is developed with an RC circuit.
    Type: Grant
    Filed: November 22, 1978
    Date of Patent: July 15, 1980
    Assignee: Pumpex Production AB
    Inventor: Arne F. Jonsson
  • Patent number: 4208171
    Abstract: A fluid pumping system includes a pump driven at a variable speed by a motor connected to the pump by a fluid cooled transducer. A regulator, connected to the transducer, controls, the speed of the pump responsive to an analog signal related in value to the flow rate of the pump and responsive to a control signal provided by a pump cycle controller. The pump cycle controller senses the level of a basin of fluid to be pumped and provides the control signal. The control signal is operative to start the pump when the fluid level reaches a predetermined starting level, to vary the pump speed responsive to changes in fluid levels higher than the starting level, and to run the pump at a minimum speed when the fluid level is between the starting level and a predetermined stopping level, lower than the starting level.
    Type: Grant
    Filed: April 6, 1977
    Date of Patent: June 17, 1980
    Assignee: Pumpex Production AB
    Inventor: Arne F. Jonsson