Ultrasonic flow rate measurement device having inlet side flow rectification part and outlet side coupling part
View Patent ↗Ultrasonic flow rate measurement device includes measurement flow path in which a fluid to be measured flows, and a pair of ultrasonic vibrators that are disposed in directions such that a propagation path of an ultrasonic wave forms a V-shape relative to measurement flow path. Moreover, the device includes measurement circuit which measures a flow rate of the fluid to be measured by measuring a propagation time of the ultrasonic wave between the pair of ultrasonic vibrators, and inlet-side rectification part which is disposed, in the inlet side of measurement flow path, to stabilize the flow of the fluid to be measured. Furthermore, the device includes outlet-side coupling part which is disposed in the outlet side of measurement flow path, and signal lead-out part which outputs a flow rate value measured with measurement circuit.
1. An ultrasonic flow rate measurement device, comprising:
a pair of ultrasonic vibrators disposed in a direction such that a propagation path of an ultrasonic wave forms a V-shape relative to a measurement flow path in which a fluid to be measured flows;
a measurement circuit for measuring a flow rate of the fluid to be measured, by measuring a propagation time of the ultrasonic wave between the pair of ultrasonic vibrators;
an inlet-side rectification part disposed in an inlet side of the measurement flow path and that stabilizes a flow of the fluid to be measured;
an outlet-side coupling part disposed in an outlet side of the measurement flow path; and
a signal lead-out part for outputting a flow rate value measured with the measurement circuit;
wherein the ultrasonic flow rate measurement device is installed by coupling the outlet-side coupling part to an installation structure and the inlet-side rectification part is detached from the installation structure.
2. The ultrasonic flow rate measurement device according to claim 1 , wherein
a flow-path cross section of the measurement flow path has a rectangular shape,
the pair of ultrasonic vibrators are disposed in a narrow side of the cross section of the measurement flow path, and
a plurality of reflectors are disposed in parallel with a flow direction inside the measurement flow path and in parallel with a long side of the cross section of the measurement flow path, for reducing an influence of a reflected wave of the ultrasonic wave in the propagation path.
3. The ultrasonic flow rate measurement device according to claim 2 , wherein
an opening of the inlet-side rectification part is configured with a curve becoming wider outward, the curve having a radius of not less than ½ of a width dimension of the narrow side of the cross section of the measurement flow path.
4. The ultrasonic flow rate measurement device according to claim 3 , wherein the measurement flow path and a circuit case accommodating the measurement circuit are configured with a resin.
5. The ultrasonic flow rate measurement device according to claim 2 , wherein the measurement flow path and a circuit case accommodating the measurement circuit are configured with a resin.
6. The ultrasonic flow rate measurement device according to claim 1 , wherein the measurement flow path and a circuit case accommodating the measurement circuit are configured with a resin.
7. The ultrasonic flow rate measurement device according to claim 1 , wherein the ultrasonic flow rate measurement device is installed in a meter body by coupling the outlet-side coupling part to a meter outlet port and the inlet-side rectification part is detached from a meter input port.
8. The ultrasonic flow rate measurement device according to claim 1 , wherein the ultrasonic flow rate measurement device is installed in a meter body by coupling the outlet-side coupling part to a meter outlet port and the inlet-side rectification part is open into a space within the meter body.
9. The ultrasonic flow rate measurement device according to claim 1 , wherein the ultrasonic flow rate measurement device is installed at a midpoint of an interior space of straight-pipe-shaped piping by coupling the outlet-side coupling part to an output port of a pipe and the inlet-side rectification part is open into the interior space of the straight-pipe-shaped piping.
10. The ultrasonic flow rate measurement device according to claim 1 , wherein the ultrasonic flow rate measurement device is installed in a pipe by coupling the outlet-side coupling part to an input port of the pipe and the inlet-side rectification part is open.