| 摘要 |
A non-contact pulley liquid level sensor, comprising a float (12) capable of floating up and down, and floating on the surface of a liquid, a tether (11), at least one pulley (15, 16), a permanent magnet (105), and a magnetic field angle sensor (103). The two ends of the tether (11) are tied to the float (12), and wound on the top end pulley (15) and the optional bottom end pulley (16). The permanent magnet (105) is installed on one side of the top end pulley (15) and rotates together with the top end pulley (15) under the effect of the friction torque produced by the tether (11). The magnetic field angle sensor (103) detects the magnetic field produced by the permanent magnet (105), and converts the rotation angle of the magnetic field into a voltage signal. According to the relationship between the rotation angle of the permanent magnet (105) and a floating distance of the float (12), the liquid level height is calculated via the outputted voltage signal. A gear may also be used to calibrate the operating range and accuracy of the present liquid level sensor. The present liquid level sensor is simple in design, has a wide measurement range, and is easy to seal. |
