Reverse Rotation Detection Whistle
Publication Date: 2015-Mar-23
The IP.com Prior Art Database
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...