Measuring and testing – Volume or rate of flow – Proportional
Patent
1983-06-15
1985-06-11
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Proportional
138 44, 138108, G01F 500
Patent
active
045220581
ABSTRACT:
In a compact thermal flowmeter unit of the type wherein a portion of the fluid in a main flow path is shunted through a laminar-flow sensor passageway, that section of the main flow path which the sensor bypasses is occupied by an appropriate range-governing cartridge selected from among a family of externally-similar tubular flow-regulating cartridges each having a different flow capacity as determined by the totals of cross-sectional areas of its plurality of linear flow channels each exhibiting an effective ratio of length to cross-section which promotes laminar flow but is nevertheless advantageously relatively short. Such tubular cartridges are conveniently inserted into and removed from threaded fastening within the unit by way of one end thereof where there is an accommodating removable end fitting; not only may changes in measurement ranges be effected readily by substituting different cartridges, but the cartridges may also be removed, easily purged clean of possible contaminants and obstructions, and replaced simply and with little effort, skill or delay. Although each intricate cartridge is essentially a precision element, its critical multiple laminar-flow channels are uniquely produced conveniently and economically with the aid of a few common uniform-diameter wires extending linearly in a special press-fit relationship between a tubular casing and a coaxial core member.
REFERENCES:
patent: Re31570 (1984-05-01), Drexel
patent: 2069630 (1937-02-01), Steenstrup
patent: 2586060 (1952-02-01), Kronberger
patent: 2688985 (1954-09-01), Holdenried
patent: 3071160 (1963-01-01), Weichbrod
patent: 3349619 (1967-10-01), Millar
patent: 3559482 (1971-02-01), Baker et al.
Goldstein Herbert
MKS Instruments Inc.
Mrose James E.
LandOfFree
Laminar-flow channeling in thermal flowmeters and the like does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laminar-flow channeling in thermal flowmeters and the like, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminar-flow channeling in thermal flowmeters and the like will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1176777