US3875797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring flow-speed of gases
Assignee: Robert Bosch GmbH
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Filing: 1973-12-12
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Granted: 1975-04-08
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Expires: 1993-12-12
Abstract
Abstract A main stream of gas is advanced in the path, and an auxiliary stream of gas is directed across the path from one to an opposite side thereof where it impinges against a pair of separated apertures which are spaced from one another in the direction of elongation of the path. This creates differential pressures in the apertures since the auxiliary stream is deflected to some extent by the main stream and does not uniformly impinge upon both apertures. The differential pressures are measured and the auxiliary stream is moved longitudinally of the path until the pressures created in both of the apertures are identical. The extent to which the auxiliary stream has had to be moved in order to produce uniform pressure in both of the apertures is an indicator of the flow speed of the main stream.
Inventors
- 👤 Josef Zweng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:46
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A method of measuring the flow-speed of gases, comprising the steps of advancing a main gas stream in a path; directing an auxiliary gas stream across said path from one to an oposite side thereof and against a pair of separated apertures which are spaced from one another longitudinally of said path; measuring a differential pressure which develops in said apertures; shifting said auxiliary gas stream longitudinally of said path and with reference to said apertures until the measured differential pressure becomes an equal pressure in both apertures; utilizing the magnitude of shifting as an indicator of the flow speed of said main gas stream; and directing secondary gas streams out of said apertures into said main gas stream.
Claim 2
Independent Claim
119 words
A method of measuring the flow-speed of gases, comprising the steps of advancing a main gas stream in a path; directing an auxiliary gas stream across said path from one to an oposite side thereof and against a pair of separated apertures which are spaced from one another longitudinally of said path; measuring a differential pressure which develops in said apertures; shifting said auxiliary gas stream longitudinally of said path and with reference to said apertures until the measured differential pressure becomes an equal pressure in both apertures; utilizing the magnitude of shifting as an indicator of the flow speed of said main gas stream; and directing secondary gas streams out of said apertures into said main gas stream.
Claim 3
Dependent Claim
159 words
In a device for measuring the flow-speed of gases, a combination comprising first means defining a flow path for a gas stream the flow speed of which is to be measured; second means forming two discrete passages at one side of said flow path, each passage having an aperture which communicates with said flow path and which are both located on a line extending longitudinally of the same; third means at an opposite side of said flow path and operative for directing an auxiliary gas stream across the same and at said apertures; fourth means for shifting said auxiliary gas stream longitudinally of said path and with reference to said apertures; differential-pressure measuring means connected with said passages for measuring the pressures therein; and means connecting said passages with a source of gas for ejecting streams of gas from said apertures into said path, so as to prevent clogging of said apertures by contaminants travelling in said flow path.
Claim 4
Dependent Claim
159 words
In a device for measuring the flow-speed of gases, a combination comprising first means defining a flow path for a gas stream the flow speed of which is to be measured; second means forming two discrete passages at one side of said flow path, each passage having an aperture which communicates with said flow path and which are both located on a line extending longitudinally of the same; third means at an opposite side of said flow path and operative for directing an auxiliary gas stream across the same and at said apertures; fourth means for shifting said auxiliary gas stream longitudinally of said path and with reference to said apertures; differential-pressure measuring means connected with said passages for measuring the pressures therein; and means connecting said passages with a source of gas for ejecting streams of gas from said apertures into said path, so as to prevent clogging of said apertures by contaminants travelling in said flow path.
Claim 5
Dependent Claim
20 words
A combination as defined in claim 2; and further comprising throttling means interposed between the respective passage and said source.
Claim 6
Dependent Claim
19 words
A combination as defined in claim 2, wherein said source also supplies said gas stream for said flow path.
References Cited (Backward Citations)
US3705534A
Cited
US3678746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |