×

Automatic power generation type flowmeter

  • US 5,199,307 A
  • Filed: 01/16/1991
  • Issued: 04/06/1993
  • Est. Priority Date: 01/20/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. An automatic power generation type flowmeter that generates an electric power signal, as a measuring signal, said flowmeter measuring a flow rate of a fluid flowing through a passage and transmitting the measuring signal to a receiver positioned at a remote location, comprising:

  • (1) detecting means, having a detection mechanism for detecting an action and a flow rate of the fluid flowing through the passage, said detecting means further including a rotatable detection shaft driven by the detection mechanism, for converting the detected flow rate into a number of rotations of the detection shaft;

    (2) transmission means for receiving a rotational force from the rotatable detection shaft of the detecting means and for converting said rotations of the detection shaft to an intermittent rotation;

    (3) power generation means coupled to the transmission means for outputting an electric signal corresponding to the detected flow rate of the fluid that had flowed through a passage the power generation means including;

    (a) a rotation shaft, having an axis and extending in an axial direction, said rotation shaft being connected to the transmission means, said rotation shaft having a permanent magnet with N- and S-poles located on first and second opposite sides of the rotation shaft;

    (b) an electromagnetic coil and a core, said core having first and second end portions and an axis passing through both said first and second end portions of said core, said electromagnetic coil being wound around the core, the core being positioned adjacent to the magnet so that the axis of the core is oriented in a direction that is perpendicular to the axis of the rotation shaft;

    (c) a first stator having first and second end portions, the first end portion of the first stator being magnetically coupled to the first end portion of the core and said second end portion of the first stator facing the N-pole of the magnet; and

    (d) a second stator having first and second end portions, the first end portion of the second stator being magnetically coupled to the second end portion of the core and said second end portion of the second stator facing the S-pole of the magnet;

    (4) a casing housing said detected mechanism, said transmission means and said detecting means; and

    (5) a flow indicator means positioned within the casing at a position adjacent to a position of said power generation means, the flow indicator means being connected to receive a rotation force from said transmission means; and

    whereinsaid second end portion of each of said first and second stators is extended adjacent a locus of movement of the N- and S-poles of said magnet, said locus of movement being defined when the rotation shaft rotates, one of said second end portions extending a different length in a direction away from said core than the other one of said second end portions.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×