Pneumotachograph with pitot-like tubes

Details Pneumotachograph with pitot-like tubes Pneumotachograph with pitot-like tubes

1982-03-29

1983-09-13

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

7386142, 128725, G01F 136, A61B 508

Patent

active

044035144

ABSTRACT:
A pneumotachograph including a housing having first and second ports which, during the course of respiration, alternate as input and output ports and which provide a path for generally linear flow of the respiratory gases. A pair of pitot tubes are disposed along the top of the path and are positioned generally at right angles thereto. A pair of baffles or flow deflectors are disposed in the path in alignment with the axes of the pitot tubes. Each of the baffles is positioned at an angle of approximately 45.degree. to the axis of its associated pitot tube and to the path of flow. The baffles may be held in the flow path by a rigid connection or alternatively, they may be retained there by a resilient connection such that the pitot tube measurement is linearized.
In another embodiment, the baffles may actually be merged into a single baffle thus leaving an annular opening between itself and the housing with the opening of the gap being approximately the same distance as the distance between the pair of tubes.

REFERENCES:
patent: 2306940 (1942-12-01), Fischer
patent: 2687645 (1954-08-01), Velten et al.
patent: 4008611 (1977-02-01), Turocy
patent: 4083245 (1978-04-01), Osborn

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