US3719082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air velocity measuring system
Assignee: Alnor Instrument Co
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Filing: 1971-03-29
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Granted: 1973-03-06
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Expires: 1991-03-29
Abstract
Abstract An air velocity measuring system having a probe adapted to be placed into a flow of air and coupled to a measuring apparatus. The probe is specially constructed and precalibrated to track a pitot standard under varying static pressure conditions. The measuring apparatus may be a flow meter having a moving vane which is responsive to the air passing through the probe. In the preferred embodiment of the invention a range adjusting switch is coupled between the probe and the measuring apparatus and enables the system to have a plurality of ranges by placing a resistance, in the form of one of a plurality of needle valves, into the path of the air flow to the measuring apparatus. In the preferred embodiment, the probe, the range adjusting switch and the measuring apparatus are calibrated to form a system. Once calibrated, the individual elements of the system are interchangeable with the corresponding elements of other of similarly calibrated mass produced systems, without requiring subsequent recalibration of each system.
Inventors
- 👤 A Obermaier
- 👤 M Pierman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:17
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/46
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
277 words
An air velocity probe which matches a pitot standard, comprising: an air flow conduit having a first end constructed with two ports to be coupled, respectively, to the input and output of an air velocity measuring device having an input and an output, said conduit having an opposite end with two ports adapted to be positioned into communication with the total and static pressure components, respectively, of flowing air to be measured, preadjustable air flow control means positioned adjacent said opposite conduit end for regulating the flow of air through said air probe, wherein said air flow control means comprises: an air flow control member affixed to said opposite end of said conduit, a passageway through said member transverse to said conduit, and a variable baffle disposed within said air flow control member and transverse to said passageway so that part of an air flow passing into said passageway is channeled into said opposite end of said conduit by way of said port that is in communication with the total pressure component, said opposite conduit end and said air flow control member being constructed and arranged for insertion into and positioned within the flowing air to be measured so as to be orthogonal at all times with respect to the flowing air, such that said transverse passageway will lie parallel to the flowing air, said air flow control means being constructed and arranged with respect to itself and said air flow conduit for the initial calibration of said probe to match it to a pitot standard, under varying static pressure conditions, and said preadjustable air flow control means being constructed to thereafter be inhibited from being adjusted.
Claim 2
Dependent Claim
277 words
An air velocity probe which matches a pitot standard, comprising: an air flow conduit having a first end constructed with two ports to be coupled, respectively, to the input and output of an air velocity measuring device having an input and an output, said conduit having an opposite end with two ports adapted to be positioned into communication with the total and static pressure components, respectively, of flowing air to be measured, preadjustable air flow control means positioned adjacent said opposite conduit end for regulating the flow of air through said air probe, wherein said air flow control means comprises: an air flow control member affixed to said opposite end of said conduit, a passageway through said member transverse to said conduit, and a variable baffle disposed within said air flow control member and transverse to said passageway so that part of an air flow passing into said passageway is channeled into said opposite end of said conduit by way of said port that is in communication with the total pressure component, said opposite conduit end and said air flow control member being constructed and arranged for insertion into and positioned within the flowing air to be measured so as to be orthogonal at all times with respect to the flowing air, such that said transverse passageway will lie parallel to the flowing air, said air flow control means being constructed and arranged with respect to itself and said air flow conduit for the initial calibration of said probe to match it to a pitot standard, under varying static pressure conditions, and said preadjustable air flow control means being constructed to thereafter be inhibited from being adjusted.
Claim 3
Dependent Claim
277 words
An air velocity probe which matches a pitot standard, comprising: an air flow conduit having a first end constructed with two ports to be coupled, respectively, to the input and output of an air velocity measuring device having an input and an output, said conduit having an opposite end with two ports adapted to be positioned into communication with the total and static pressure components, respectively, of flowing air to be measured, preadjustable air flow control means positioned adjacent said opposite conduit end for regulating the flow of air through said air probe, wherein said air flow control means comprises: an air flow control member affixed to said opposite end of said conduit, a passageway through said member transverse to said conduit, and a variable baffle disposed within said air flow control member and transverse to said passageway so that part of an air flow passing into said passageway is channeled into said opposite end of said conduit by way of said port that is in communication with the total pressure component, said opposite conduit end and said air flow control member being constructed and arranged for insertion into and positioned within the flowing air to be measured so as to be orthogonal at all times with respect to the flowing air, such that said transverse passageway will lie parallel to the flowing air, said air flow control means being constructed and arranged with respect to itself and said air flow conduit for the initial calibration of said probe to match it to a pitot standard, under varying static pressure conditions, and said preadjustable air flow control means being constructed to thereafter be inhibited from being adjusted.
Claim 4
Dependent Claim
277 words
An air velocity probe which matches a pitot standard, comprising: an air flow conduit having a first end constructed with two ports to be coupled, respectively, to the input and output of an air velocity measuring device having an input and an output, said conduit having an opposite end with two ports adapted to be positioned into communication with the total and static pressure components, respectively, of flowing air to be measured, preadjustable air flow control means positioned adjacent said opposite conduit end for regulating the flow of air through said air probe, wherein said air flow control means comprises: an air flow control member affixed to said opposite end of said conduit, a passageway through said member transverse to said conduit, and a variable baffle disposed within said air flow control member and transverse to said passageway so that part of an air flow passing into said passageway is channeled into said opposite end of said conduit by way of said port that is in communication with the total pressure component, said opposite conduit end and said air flow control member being constructed and arranged for insertion into and positioned within the flowing air to be measured so as to be orthogonal at all times with respect to the flowing air, such that said transverse passageway will lie parallel to the flowing air, said air flow control means being constructed and arranged with respect to itself and said air flow conduit for the initial calibration of said probe to match it to a pitot standard, under varying static pressure conditions, and said preadjustable air flow control means being constructed to thereafter be inhibited from being adjusted.
Claim 5
Dependent Claim
105 words
An air velocity probe as defined in claim 1 in which said conduit comprises: a pair of longitudinally extending and parallel tubes, one end of each tube communicating respectively with the input and output of the measuring device, and said air flow control means comprising an air flow control member having a total pressure side and a static pressure side respectively coupled to the other end of said tubes, there thus being defined a path for air to flow from said total pressure side, through one of said tubes, through the measuring device, through the other of said tubes, and to said static pressure side.
Claim 6
Dependent Claim
41 words
An air velocity probe as defined in claim 2 wherein said air flow control member includes: a passageway through said member transverse to said tubes, and a variable baffle disposed within said air flow control member and transverse to said passageway.
Claim 7
Dependent Claim
88 words
An air velocity probe as defined in Claim 3 in which said air flow control member further includes: a fixed baffle disposed within and transverse to said passageway and opposite to said variable baffle, said variable baffle and said fixed baffle being so disposed that part of an air flow passing into said passageway is channeled into said one tube for communicating with the input to the measuring device and the remainder of the air flow passes directly out through said control member to its static pressure side.
Claim 8
Dependent Claim
46 words
An air velocity probe as defined in claim 4 in which said variable baffle comprises: a threaded bore coaxial with said conduit and communicating with said passageway through said member, and a needle screw coacting with said threaded bore and arranged to extend into said passageway.
Claim 9
Dependent Claim
56 words
An air velocity probe as defined in claim 5 wherein: the pitot standard to which said air probe is matched is a pitot static-tube and that matching is effective over a dynamic range of air velocity, such that the defined construction of said air probe, which provides for the dynamic range matching, defines a pitot probe.
Claim 10
Dependent Claim
48 words
An air velocity probe as defined in claim 5 which further includes: preset range selecting means coupled in air flow communication to said first and second tubes and including switchable air resistance means for further regulation of the air flow through said air probe to the measuring device.
Claim 11
Dependent Claim
67 words
An air velocity probe as defined in claim 1 in which Said variable baffle comprises: a threaded bore coaxial with said conduit and communicating with said passageway through said member, and a needle valve coacting with said threaded bore for extending partially into said passageway, and said air probe further comprises a fixed baffle disposed within and transverse to said passageway and opposite to said variable baffle.
Claim 12
Dependent Claim
47 words
An air velocity probe as defined in claim 1 in which said conduit and air flow control member combine to form a narrow and elongated air probe having parallel sides and a small cross section for direct and orthogonal insertion into the flowing air to be measured.
Claim 13
Dependent Claim
72 words
An air velocity probe as defined in claim 1 in which said transverse passageway has a length which defines the width of said air flow control member, said opposite conduit end has a width substantially equal to that width of said air flow control member and oriented parallel to said passageway, and said conduit and said air flow control member in combination have a length many times greater than their said widths.
Claim 14
Dependent Claim
101 words
The air velocity probe as defined in claim 1, and in combination therewith a range adjusting switch, said switch having one end communicating with said air probe and other end adapted to communicate with a measuring device, said switch comprising: a receptacle for interconnection with said air probe, a first chamber communicating with said receptacle for air flow to the input of a measuring device, a second chamber communicating with said receptacle for air flow returning from such measuring device, and an air flow restrictive member positioned in one of said chambers to regulate the air flow through such measuring device.
Claim 15
Dependent Claim
44 words
The combination defined in claim 11 wherein said range adjusting switch further comprises: a plurality of restrictive members and mechanical means for placing a selected one of said restrictive members in one of said chambers to regulate the air flow through a measuring device.
Claim 16
Dependent Claim
53 words
The combination defined in claim 12 in which, each said restrictive member is a valve preset to a different air flow regulating value and said mechanical placing means is a rotatable disc coaxial with said chambers and has pairs of axial ducts, with one duct of each pair housing one of said valves.
Claim 17
Dependent Claim
248 words
An air velocity measuring system comprising: an air velocity probe which includes a conduit having a first end which is to be inserted orthogonally into a flow or air, a precalibratible air flow control means affixed to said first end, a second end which is to be coupled to an air velocity measuring device, and a pair of air paths between said ends; said air flow control means is constructed to include a total pressure input side and a static pressure side, respectively, in orthogonal air flow connection with said pair of air paths and also in direct air flow connection to one another; an air velocity measuring device having an air flow input and output respectively associated with said pair of air paths of said conduit; a measuring device range adjusting switch interposed between said air probe and said measuring device and having separate input and output paths which mate this said pair of air paths and said air flow input and output, respectively, to complete a continuous air flow route through said air probe, range switch and measuring device, with the only air flow entrance and exit for the system being at said sides of said air flow control means; said air flow control means being constructed and arranged with respect to itself and said system for the calibration of said air probe and said system to match their responses to a pitot standard under varying static pressure conditions as seen at said static pressure side.
Claim 18
Dependent Claim
248 words
An air velocity measuring system comprising: an air velocity probe which includes a conduit having a first end which is to be inserted orthogonally into a flow or air, a precalibratible air flow control means affixed to said first end, a second end which is to be coupled to an air velocity measuring device, and a pair of air paths between said ends; said air flow control means is constructed to include a total pressure input side and a static pressure side, respectively, in orthogonal air flow connection with said pair of air paths and also in direct air flow connection to one another; an air velocity measuring device having an air flow input and output respectively associated with said pair of air paths of said conduit; a measuring device range adjusting switch interposed between said air probe and said measuring device and having separate input and output paths which mate this said pair of air paths and said air flow input and output, respectively, to complete a continuous air flow route through said air probe, range switch and measuring device, with the only air flow entrance and exit for the system being at said sides of said air flow control means; said air flow control means being constructed and arranged with respect to itself and said system for the calibration of said air probe and said system to match their responses to a pitot standard under varying static pressure conditions as seen at said static pressure side.
Claim 19
Dependent Claim
90 words
An air velocity measuring system as defined in claim 16 wherein said air flow control means includes: a needle valve which, in combination with said conduit, defines an air flow channel for communication with said input path of said switch, said air flow channel, by calibration of said needle valve, being subject to receive a calibrated portion of the total pressure component of the air flow to be measured, the remainder of the total pressure component passing directly through said air flow control means to said static pressure side thereof.
Claim 20
Dependent Claim
36 words
An air velocity measuring system as defined in claim 15 in which said range adjusting switch includes: at least one air flow restriction member selectively positionable into one of said paths of said range adjusting switch.
Claim 21
Dependent Claim
38 words
An air velocity measuring system as defined in claim 16 which includes a passageway through said air flow control means, through which said remainder of the total pressure component flows and in which said needle valve is housed.
Claim 22
Dependent Claim
72 words
An air velocity measuring system as defined in claim 17 in which said passageway has a length which defines the width of said air flow control means, said first conduit end has a width substantially equal to that width of said air flow control means and oriented parallel to said passageway, and said conduit and said air flow control means in combination have a length many times greater than their said widths.
Claim 23
Dependent Claim
50 words
An air velocity measuring system as defined in claim 14 wherein said range adjusting switch further comprises: a plurality of air restrictive members and mechanical means for placing a selected one of said restrictive members in one of said switch paths to regulate the air flow through said measuring device.
Claim 24
Dependent Claim
58 words
An air flow measuring system as defined in claim 19 in which, each said restrictive member is a valve preset to a different air flow regulating value and said mechanical placing means is a rotatable disc coaxial with said switch paths and has pairs of axial ducts, with one duct of each pair housing one of said valves.
Claim 25
Dependent Claim
73 words
An air velocity measuring system as defined in claim 14 wherein said air flow control means further comprises: a passageway through said control means and transverse to said conduit, and a variable baffle disposed within said air flow control means and transverse to said passageway, so that part of an air flow passing into said passageway is channeled into said first end of said conduit by way of said total pressure input side.
Claim 26
Dependent Claim
65 words
An air velocity measuring system as defined in claim 21 in which said variable baffle comprises: a threaded bore coaxial with said conduit and passing into said passageway, and a needle valve coacting with said threaded bore for extending partially into said passageway, and said air probe further comprises a fixed baffle disposed within and transverse to said passageway and opposite to said variable baffle.
Claim 27
Dependent Claim
48 words
An air velocity measuring system as defined in claim 22 in which said conduit and air flow control means combine to form a narrow and elongated air probe having parallel sides and a small cross section for direct and orthogonal insertion into the following air to be measured.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |