Title:
DIFFERENTIAL PRESSURE-TYPE FLOW METER, EXHAUST GAS ANALYSIS DEVICE, FLOW RATE MEASUREMENT METHOD, EXHAUST GAS ANALYSIS METHOD, AND PROGRAM FOR DIFFERENTIAL PRESSURE-TYPE FLOW METER
Document Type and Number:
WIPO Patent Application WO/2022/080113
Kind Code:
A1
Abstract:
The present invention measures, with high accuracy, the flow rate of a non-steady flow associated with pulsation, and is a differential pressure-type flow meter 2 that detects the differential pressure of a fluid flowing through a symmetrical flow path part and calculates the flow rate Q of the fluid from the differential pressure, said symmetrical flow path part being symmetrical to the upstream side and the downstream side from a prescribed reference location, said pressure-type flow meter 2 comprising: a first differential pressure detection part 22 that detects a first differential pressure P1 in the symmetrical flow path part R1; a second differential pressure detection part 23 that detects a second differential pressure P2 in the symmetrical flow path part R1; and a flow rate calculation part 24 that uses a prescribed arithmetic expression to calculate the flow rate Q from the first differential pressure P1 and the second differential pressure P2, wherein the prescribed arithmetic expression results from using a first arithmetic expression that calculates the flow rate from the first differential pressure P1 and includes a time variation term dQ/dt for the flow rate Q, and a second arithmetic expression that calculates the flow rate Q from the second differential pressure P2 and includes the time variation term dQ/dt for the flow rate Q, and removing the shared term that is the time variation term dQ/dt for the flow rate Q.
Inventors:
NAGAOKA MAKOTO (JP)
Application Number:
PCT/JP2021/034977
Publication Date:
April 21, 2022
Filing Date:
September 24, 2021
Export Citation:
Assignee:
HORIBA LTD (JP)
International Classes:
G01F1/46; G01F1/72
Foreign References:
| JPH0743183A | 1995-02-10 | |||
| JPH0618541A | 1994-01-25 | |||
| US5736650A | 1998-04-07 | |||
| JP2014020808A | 2014-02-03 | |||
| JP2011515689A | 2011-05-19 |
Attorney, Agent or Firm:
NISHIMURA, Ryuhei (JP)
Download PDF:
Previous Patent: HEATER MEMBER FOR THERMOSTAT AND MANUFACTURING METHOD THEREFOR
Next Patent: SEMICONDUCTOR MODULE
Next Patent: SEMICONDUCTOR MODULE