Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1995-09-25
1997-02-11
Thorpe, Timothy
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
417 53, 418 2, 418197, F04B 4906
Patent
active
056014147
ABSTRACT:
A positive displacement rotary axial screw pump which comprises a series of sealed closures formed by meshing of the rotors for building the internal pressure gradient of the pump from the pump inlet to its outlet. A programmable logic circuit is provided for signaling impending abnormal pressure conditions in the pump and, upon the onset of such conditions, modifying pump operation to compensate for the abnormal conditions. A pressure monitoring device detects selected disruption in the normal pressure gradient of the pump indicative of the impending abnormal conditions and signals the logic circuit of the impending conditions. The pressure monitoring device includes a pressure sensing device associated with at least one isolated volume for sensing internal pressure gradients of the pump.
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IMO Industries Inc.
Thai Xuan M.
Thorpe Timothy
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