Liquid level measuring device

摘要

The present invention provides a liquid level measuring device which comprises: a tube for accommodating a liquid; a floating member disposed inside the tube, the floating member rising and falling as the level of the liquid varies; at least one magnetic detecting element fastened to the floating member, the magnetic detecting element floating along with the floating member; and a plurality of magnetic sources disposed outside the tube, which are distributed separately along the changing direction of the liquid level so as to establish a specific magnetic field strength distribution, wherein the magnetic detecting element detects the magnetic field strength at the height at which the magnetic detecting element is located and outputs a measuring signal correspondingly, and the liquid level is determined according to the measuring signal. The present invention has many advantages including low cost, efficiency, and it can easily be deployed in considerable amounts.

主权项

1. A liquid level measuring device, comprising:
a tube for accommodating a liquid; a floating member disposed inside the tube, the floating member rising and falling as a level of the liquid in the tube varies; a magnetic detecting unit having at least one magnetic detecting element, the magnetic detecting element and the floating member being fastened to each other such that the magnetic detecting element floats along with the floating member; and a plurality of magnetic sources disposed outside the tube, the magnetic sources being distributed separately along a changing direction of the liquid level so as to establish a specific magnetic field strength distribution, wherein the magnetic detecting element detects a magnetic field strength at the liquid level at which the magnetic detecting element is located and outputs a measuring signal correspondingly, and the liquid level is determined according to the measuring signal outputted by the magnetic detecting element; and wherein a one-to-one correspondence exists between the magnetic field strength and the liquid level within a liquid level measurement range in the specific magnetic field strength distribution.