Paddle wheel flow meter

A paddle wheel flow meter, comprising:

• a base, being capable of being embedded in a fluid pipeline, and having two lugs;
• a paddle wheel, disposed between the two lugs, comprising paddles, two disc wheels, two bearings and at least a magnet, wherein the disc wheels are located at two opposite sides of the paddles, the bearings are respectively disposed in the disc wheels, and the magnet is disposed in at least one of the disc wheels;
• an axis, having two ends respectively fixed to the lugs through the bearings;
• and
• a magnetic sensor, disposed in the base;
• and
• a data processor, connecting to the magnetic sensor;
• when a fluid in the fluid pipeline drives the paddle wheel rotating, the magnetic sensor generates a continuous wave signal by sensing a magnetic field change of the magnet, the data processor calculates an angular velocity of the paddle wheel according to the continuous wave signal, and determines abnormal conditions of the paddle wheel flow meter on the continuous wave signal out of a normal range.