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Ultrasonic flow sensor and method of attaching the same

  • US 10,190,896 B2
  • Filed: 11/21/2017
  • Issued: 01/29/2019
  • Est. Priority Date: 01/26/2017
  • Status: Active Grant
First Claim
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1. An ultrasonic flow sensor comprising:

  • a first sensor unit including a first ultrasonic device which performs at least one of transmission of ultrasonic waves to a fluid flowing in piping or reception of ultrasonic waves from the fluid flowing in the piping;

    a second sensor unit including a second ultrasonic device which performs at least the other one of transmission of ultrasonic waves to a fluid flowing in the piping or reception of ultrasonic waves from the fluid flowing in the piping;

    a calculation part configured to calculate a flow rate of the fluid in the piping by obtaining a time difference between times required for ultrasonic waves to propagate from an upstream side to a downstream side and from the downstream side to the upstream side of the fluid flowing in the piping based on output signals from the first ultrasonic device and the second ultrasonic device;

    a first fitting configured to accommodate the first sensor unit and fix the first sensor unit to the piping, the first fitting including a first position regulating portion configured to come into contact with an outer peripheral surface of the piping so as to align orientation of the first ultrasonic device with respect to the second ultrasonic device in an axial direction of the piping when viewing in a radial direction of the piping and a first housing portion configured to accommodate the first sensor unit from the opposite side of the piping with respect to the first position regulating portion; and

    a second fitting configured to accommodate the second sensor unit and fix the second sensor unit to the piping, the second fitting including a second position regulating portion configured to come into contact with the outer peripheral surface of the piping so as to align orientation of the second ultrasonic device with respect to the first ultrasonic device in the axial direction of the piping when viewing in the radial direction of the piping, and a second housing portion configured to accommodate the second sensor unit from the opposite side of the piping with respect to the second position regulating portion,wherein the first and second fittings further include;

    a pair of first and second arm portions extending from one of the first housing portion and the second housing portion to the other to regulate the relative position between the first housing portion and the second housing portion in a circumferential direction of the piping on both sides of a plane including the axial line of the piping, the first ultrasonic device, and the second ultrasonic device; and

    a guide portion formed at least on the arm portions and configured to guide relative positioning between the first fitting and the second fitting in the axial direction of the piping according to a diameter of the piping.

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