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Reverse Rotation Detection Whistle Disclosure Number: IPCOM000241058D
Publication Date: 2015-Mar-23
Document File: 2 page(s) / 506K

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This device uses the air flow generated by the cooling fan of an electric motor. If the motor fan is rotating in the “forward” or intended direction for the driven equipment, e.g., pump, compressor, or other, the whistle does not emit any sound. If, however, the fan is rotating in the “reverse” or counter direction for the specific application, the air flow energizes the whistle. The whistle sound alerts a passer-by that the equipment has malfunctioned. The alerted individual can intervene in this abnormal situation.

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Long  term  sustainability  of  electrical  motors  includes  the  capability  to  detect  and  address  reverse  rotation.  Pumps  can  rotate  in  the  reverse  direction  if  the  upstream  check  valve  does  not  close.  Accidentally, energizing the motor during this reverse rotation can cause serious damage of the pump  and even to near‐by personnel. There is a need for a non‐electrical, scalable, add‐on reverse rotation  detection method that can be included on existing field pumps without requiring an expensive retrofit. 

The  proposed  invention  (see  Figure  1)  utilizes  a  combination  of  the  engineering  principles  found  in  louvers and whistles to create an audible sound when the motor is rotating in an unintended direction.  The  angled  louvers  will  allow  air  to  flow  into  the  attachment  when  the  motor's  fan  rotates  in  one  direction and minimal air will flow into the attachment when the fan rotates in the opposite direction.  Just like a whistle, this device will produce sound from a stream of forced air through the small outlets.  An audible alarm sound is intended to alert operators and mitigate accidents and safety hazards related  to energizing a pump's motor while the pump is rotating in the wrong direction due to back‐flow...