Centrifugal fan speed sensor

The utility model provides a centrifugal fan speed sensor, centrifugal fan technical field. Shaft coupling including centrifugal fan, centrifugal fan main shaft, bearing frame, motor, motor spindle, connection centrifugal fan main shaft and motor spindle, the shaft coupling includes fan end half -coupling, motor end half -coupling, connects fan end half -coupling and motor end half -coupling's elasticity post, and its characterized in that is equipped with the tooth that tests the speed that is used for detecting the centrifugal fan rotational speed of a plurality of equipartitions on the shaft coupling, is equipped with to carry out the speed measuring probe that tests the speed facing to the tooth that tests the speed on motor reel shaft bearing. The utility model discloses can test the speed to the centrifugal fan accuracy to ensure safety, the steady operation of centrifugal fan in putting into production, and its simple structure improves at current shaft coupling, concrete structure is the tooth that te