| 摘要 |
This invention discloses an electronic water meter with precision metering capability. The electronic water meter comprises a mechanical frame (500), multiple counter units, and multiple shielding plates (601-604). The counter units comprise numerical character wheels (301-303), magnets (201-203), magnetic angular displacement sensors (101-103), and digital circuits (401-403). The magnetic angular displacement sensors (101-103) are electrically connected to the digital circuits (401-403), and they sense components of magnetic fields at respective positions thereof as a function of the angular position of magnetic field vectors of the counter units, and transmit a corresponding electric signal to the digital circuits (401-403). The digital circuits (401-403) perform a calculation based on the electrical signals output from the magnetic angular displacement sensors (101-103) and output a digital signal corresponding to the angular positions of the numerical character wheels (301-303). The shielding plates (601-604) are arranged on two sides of the counter units and are used for magnetic isolation of the multiple counter units and between the multiple counter units and the external field. The electronic water meter has the advantages of compact size, easy installation, high metering precision, and strong immunity to external interference. |
