Check patentability & draft patents in minutes with Patsnap Eureka AI!

Flow metering device

A technology of flow measurement and flow, which is applied in measuring devices, measuring flow/mass flow, liquid/fluid solid measurement, etc. It can solve the problems of easy adjustment error, time-consuming reference voltage setting, etc., and achieve high measurement accuracy. Effect

Inactive Publication Date: 2004-02-11
PANASONIC CORP
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using this method, in order to form a specified reference voltage, it is necessary to manually adjust the semi-fixed resistance while monitoring the reference voltage, so the setting of the reference voltage is time-consuming and prone to adjustment errors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flow metering device
  • Flow metering device
  • Flow metering device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a block diagram of the flow metering device in Embodiment 1 of the present invention, figure 2A schematic diagram illustrating the operation of a flow metering device. A first ultrasonic oscillator 2 for emitting ultrasonic waves and a second ultrasonic oscillator 3 for receiving ultrasonic waves are arranged in the middle of the flow path 1 through which the fluid flows, and they are arranged to form an angle φ with the flow direction of the fluid. The transmitting device 5 drives the first ultrasonic oscillator 2 or the second ultrasonic oscillator 3 to emit ultrasonic waves. The switching device 4 switches the ultrasonic transmitting / receiving operations performed in the first ultrasonic oscillator 2 and the second ultrasonic oscillator 3 . The gain of the amplifying device 6 is adjusted so that the signal received by the ultrasonic oscillator on the receiving side is output at a constant amplitude. The reference setting means 13 sends the referen...

Embodiment 2

[0041] image 3 It is a block diagram of the flow metering device in Embodiment 2 of the present invention, Figure 4 and Figure 5 A schematic diagram illustrating the operation of the flow metering device. The time difference counting unit 13 c counts the time difference between the output of the reference comparing means 7 and the output of the judging means 8 . The voltage setting unit 13 a sets a reference voltage according to the output of the time difference timer unit 13 c, and outputs the set voltage to the reference comparison device 7 . The voltage setting unit 13 a and the time difference timer unit 13 c constitute a reference setting device 131 . Since the other components are the same as in Embodiment 1, description thereof will be omitted.

[0042] Next, the operation of the flow measuring device having the above construction will be described. When flow measurement is started, the control device 12 operates the transmitter 5 to emit ultrasonic waves from t...

Embodiment 3

[0047] Figure 6 It is a block diagram of the flow measuring device in Embodiment 3 of the present invention. Figure 7 is a schematic diagram illustrating the operation of the flow metering device, Figure 8 is a flowchart showing its operation. A first ultrasonic oscillator 2 and a second ultrasonic oscillator 3 for transmitting / receiving ultrasonic waves are arranged at a certain angle φ relative to the flow direction of the fluid on the flow path 1 . The transmitter 5 causes the first ultrasonic oscillator 2 or the second ultrasonic oscillator 3 to emit ultrasonic waves. The switching device 4 is used for exchanging the ultrasonic transmitting / receiving operations in the first ultrasonic oscillator 2 and the second ultrasonic oscillator 3 . The amplifying device 6 amplifies the signal received by the ultrasonic oscillator on the receiving side according to the gain controlled by the control device 12 , and the reference comparing device 7 compares the signal amplified b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A flow meter measures a flow rate of fluid flowing through a flow passage based on a duration of propagation of an ultrasonic wave along the flow passage. A signal of the received ultrasonic wave is then compared with a reference voltage to detect an arrival of the ultrasonic wave. A voltage setting unit determines the reference voltage to an appropriate level according to a signal output from a propagation measuring unit which measures a duration of propagation of the ultrasonic wave along the flow passage from the start of transmission of the ultrasonic wave to the output of a signal from a judging unit as the reference voltage being changed. The reference voltage is determined readily and accurately, the flow meter measures the flow rate with the appropriate reference voltage.

Description

technical field [0001] The invention relates to a flow measuring device for measuring the flow of gas and other fluids by using ultrasonic waves. Background technique [0002] Existing flow metering devices such as Figure 20 shown in . A first ultrasonic oscillator 32 and a second ultrasonic oscillator 33 for emitting / receiving ultrasonic waves are provided on the flow path 31 through which fluid such as gas flows. The switching device 34 is used for switching the ultrasonic transmitting / receiving operations of the first ultrasonic oscillator 32 and the second ultrasonic oscillator 33 . The transmitting device 35 drives the first ultrasonic oscillator 32 or the second ultrasonic oscillator 33 to emit ultrasonic waves. The amplifying means 36 amplifies the signal sent from the ultrasonic oscillator for receiving ultrasonic waves through the switching means 34 to a predetermined amplitude. The reference comparing means 37 compares the received signal voltage amplified and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01F1/66
CPCG01F1/668G01F1/66
Inventor 江口修竹村晃一安倍秀二
Owner PANASONIC CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com