Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1993-12-10
1995-08-29
Chin, Stephen
Measuring and testing
Volume or rate of flow
Using differential pressure
7386101, 138 40, G01F 137
Patent
active
054450357
ABSTRACT:
A mass flow meter includes a body having a cylindrical bore and an elongated cylindrical piston positioned in the bore concentrically therewith. An elongated annular fluid flow channel of uniform depth is bounded by a cylindrical surface of the piston and a surface of the bore. Fluid flows laminafly through the channel. First and second concentric ferrules are located at first and second end portions of the piston to precisely position and hold the piston concentrically in the bore, by elastically expanding in response to longitudinal forces on the first and second end portions of the piston to symmetrically engage a wall of the bore. A first pressure measuring probe in fluid communication with an upstream equalization chamber measure fluid pressure in the upstream equalization chamber, and a second differential pressure transducer in fluid communication between the upstream equalization chamber and a downstream equalization chamber measures differential fluid pressure between the two equalization chambers. The difference between the pressures measured in the two equalization chambers represents the mass flow of the fluid through the channel. The simple, near-ideal geometric shapes of the bore, piston, and ferrules permits simple, accurate mathematical modeling of corrections to account for changes in pressure, temperature, and thermal gradient.
REFERENCES:
patent: 3071160 (1963-01-01), Weichbrod
patent: 3115777 (1963-12-01), Hochreiter
patent: 3173003 (1965-03-01), Muller-Girard
patent: 3196680 (1965-07-01), Curran
patent: 3220256 (1965-11-01), Weichbrod
patent: 3349619 (1967-10-01), Millar
patent: 3605496 (1971-09-01), Wenham
patent: 3701280 (1972-10-01), Stroman
patent: 3838598 (1974-10-01), Tompkins
patent: 3840051 (1974-10-01), Akashi et al.
patent: 4408498 (1983-10-01), Heath
patent: 4419898 (1983-12-01), Zanker et al.
patent: 4419898 (1983-12-01), Zanker
patent: 4484472 (1984-11-01), Licinit et al.
patent: 4562744 (1986-01-01), Hall et al.
patent: 4576204 (1986-03-01), Smallhorn et al.
patent: 4768384 (1988-09-01), Flecken et al.
patent: 4799169 (1989-01-01), Mims
patent: 4829449 (1989-05-01), Polesnak
Chin Stephen
May Timothy J.
LandOfFree
Precision gas mass flow measurement apparatus and method maintai does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Precision gas mass flow measurement apparatus and method maintai, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precision gas mass flow measurement apparatus and method maintai will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1812632