Title:
非定常流量計
Document Type and Number:
Japanese Patent JP4980073
Kind Code:
B2
Abstract:
The flow meter has a differential pressure device (1) placed within a conduit and including two wall pressure taps (A, B). A pressure difference calculation unit (2) connected to the taps calculates a difference between two static pressures. An electronic calculator (3) calculates fluid flow by resolving a formula relating an instantaneous fluid flow with the pressure difference and taking into account a fluid flow direction. The formula specifies that a sum of rate of change of desired volume flow rate with respect to time and a function depending on the geometry of the differential pressure device, the fluid and the flow, is equal to a product of a coefficient which is function of geometry of the flow meter and the instantaneous pressure difference. The pressure difference in the formula is positive or negative based on variation of the rate of fluid flow in the conduit and/or the direction of the fluid flow. An independent claim is also included for a method to measure flow of a fluid having steady or unsteady flow in a conduit.
Inventors:
Eric, Fucol
Philip, Zeje
Janic, Romonier
Philip, Michaud
Philip, Zeje
Janic, Romonier
Philip, Michaud
Application Number:
JP2006553613A
Publication Date:
July 18, 2012
Filing Date:
February 16, 2005
Export Citation:
Assignee:
Centre National De La Recherche Scientifique (C.N.R.S)
International Classes:
G01F1/50; G01F1/36; G01F1/42; G01F1/44; G01F1/88
Domestic Patent References:
| JP54001662A | ||||
| JP2003526097A | ||||
| JP2004020524A | ||||
| JP62226016A | ||||
| JP10232152A | ||||
| JP2000205912A | ||||
| JP2001082991A | ||||
| JP11051719A |
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki