Patent US5086655A successfully refreshed from Google Patents.
US5086655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orifice measuring device
Assignee: AVL List GmbH
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Filing: 1990-10-12
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Granted: 1992-02-11
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Expires: 2010-10-12
Abstract
Abstract The invention relates to a plate orifice for a or in a measuring device forhe flow metering of fluid streams, in particular gas streams, preferably for gas streams present in internal combustion engines, with the fluids, in particular the gases, being guided through at least one plate orifice (restrictor) disposed in a pipe and provided with a sharp edge definig its flow orifice, with a pressure sensor or a pressure measuring line of a differential pressure measuring device or of a differential pressure transducer disposed upstream as well as downstream of the plate orifice, the output signal of the differential pressure measuring device or the differential pressure transducer depending on the differential pressure forming the measuring signal for the fluid flow rate, in particular gas flow rate, through the plate orifice and optionally being fed to an evaluation unit. In plate orifices or measuring devices of this type, problems due to their contamination and their universal usability arise. These problems were overcome according to the invention by providing, in particular for the flow measurements of pulsating fluid streams, preferably gas streams, that the plate orifice is symmetrically formed at least in the zone of the sharp edge, preferably in its zone extending into the interior of the pipe, in relation to a plane passing through the sharp edge of the flow orifice of the plate orifice and that the flank angle (α) of the sharp edge is 70° to 110° at the most, preferably 90° at the most. In addition, the invention relates to the embodiment of plate orifices and measuring devices per se.
Inventors
- 👤 George E. Fredericks
- 👤 Alfred Jaschek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:49
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/42
Claims Analysis
Total Claims: 61
Claim 1
Independent Claim
186 words
A measuring device for the flow metering of fluid streams comprising at least one orifice plate disposed within a pipe and having an orifice defined by a sharp, radially inwardly directed edge, said fluid being guided through said orifice, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said orifice, a plane passing through the sharp edge of the orifice of the plate, said sharp edge being formed by first and second, in cross-section straight surfaces which converge at an angle of no more than about 110°, the surfaces being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° at the flow orifice.
Claim 2
Dependent Claim
186 words
A measuring device for the flow metering of fluid streams comprising at least one orifice plate disposed within a pipe and having an orifice defined by a sharp, radially inwardly directed edge, said fluid being guided through said orifice, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said orifice, a plane passing through the sharp edge of the orifice of the plate, said sharp edge being formed by first and second, in cross-section straight surfaces which converge at an angle of no more than about 110°, the surfaces being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° at the flow orifice.
Claim 3
Dependent Claim
21 words
A measuring device according to claim 1, wherein the flank angle α is between 70° to 110° at the flow orifice.
Claim 4
Dependent Claim
19 words
A measuring device according to claim 1, wherein the flank α is at most 90° at the flow orifice.
Claim 5
Dependent Claim
47 words
A measuring device according to claim 1, further including a counter pressure sensor for determining the counter pressure prevailing upstream of the solid plate orifice in the pipe on one side of the plate orifice in the case of a preferred flow direction of the fluid stream.
Claim 6
Dependent Claim
217 words
A measuring device for the flow metering of fluid streams comprising at least one solid plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° at the flow orifice, wherein the differential pressure measuring device comprises a differential pressure transducer having pressure measuring lines, wherein pressure equalization means are provided and wherein said lines connect said transducer with the pipe for achieving zero point adjustment of said differential pressure by said pressure equalization means, said pressure measuring lines are disconnectable from the pipe by means of which both pressure measuring lines are simultaneously subjected to equal pressure.
Claim 7
Dependent Claim
217 words
A measuring device for the flow metering of fluid streams comprising at least one solid plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° at the flow orifice, wherein the differential pressure measuring device comprises a differential pressure transducer having pressure measuring lines, wherein pressure equalization means are provided and wherein said lines connect said transducer with the pipe for achieving zero point adjustment of said differential pressure by said pressure equalization means, said pressure measuring lines are disconnectable from the pipe by means of which both pressure measuring lines are simultaneously subjected to equal pressure.
Claim 8
Dependent Claim
267 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within the pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, wherein the differential pressure measuring device comprises a differential pressure transducer having pressure measuring lines, wherein pressure equalization means are provided and wherein said lines connect said transducer with the pipe for achieving a zero point adjustment of said differential pressure transducer by said pressure equalization means, said pressure measuring lines are disconnectable from the pipe by means of which both pressure measuring lines are simultaneously subjectable to equal pressure and wherein said device is adapted to measure the gas stream in internal combustion engines and wherein an evaluation unit and an angle mark indicator are provided, wherein said indicator is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 9
Dependent Claim
267 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within the pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, wherein the differential pressure measuring device comprises a differential pressure transducer having pressure measuring lines, wherein pressure equalization means are provided and wherein said lines connect said transducer with the pipe for achieving a zero point adjustment of said differential pressure transducer by said pressure equalization means, said pressure measuring lines are disconnectable from the pipe by means of which both pressure measuring lines are simultaneously subjectable to equal pressure and wherein said device is adapted to measure the gas stream in internal combustion engines and wherein an evaluation unit and an angle mark indicator are provided, wherein said indicator is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 10
Dependent Claim
188 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals depending upon the differential pressure forming an orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° and wherein said device is adapted to measure the gas stream in internal combustion engines, and wherein an evaluation unit and an ignition order measuring device are provided, wherein the device is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 11
Dependent Claim
188 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals depending upon the differential pressure forming an orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° and wherein said device is adapted to measure the gas stream in internal combustion engines, and wherein an evaluation unit and an ignition order measuring device are provided, wherein the device is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 12
Dependent Claim
201 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals depending upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° and wherein said device is adapted to measure the gas stream in internal combustion engines and wherein an evaluation unit and a measuring unit for the number of cylinders are provided, wherein said unit is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 13
Dependent Claim
201 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals depending upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° and wherein said device is adapted to measure the gas stream in internal combustion engines and wherein an evaluation unit and a measuring unit for the number of cylinders are provided, wherein said unit is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 14
Dependent Claim
195 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals depending upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° and wherein said device is adapted to measure the gas stream in internal combustion engines and wherein an evaluation unit and a speedometer are provided, wherein said speedometer is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 15
Dependent Claim
195 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals depending upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° and wherein said device is adapted to measure the gas stream in internal combustion engines and wherein an evaluation unit and a speedometer are provided, wherein said speedometer is connected with said evaluation unit and supplies said unit with measuring data in addition to measuring signals of the differential pressure transducer.
Claim 16
Dependent Claim
224 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, and wherein the device is adapted to measure the gas stream of an internal combustion engine, the internal combustion engine comprising a crankcase, said crankcase having a ventilation, the measuring device being connected to said crankcase ventilation and being provided with a pressure adjusting means and the plate orifice being used to adjust by said adjusting means a differential pressure of 0.03 to 100 mm H 2 O and a counter pressure of less than 10 mm H 2 O.
Claim 17
Dependent Claim
224 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, and wherein the device is adapted to measure the gas stream of an internal combustion engine, the internal combustion engine comprising a crankcase, said crankcase having a ventilation, the measuring device being connected to said crankcase ventilation and being provided with a pressure adjusting means and the plate orifice being used to adjust by said adjusting means a differential pressure of 0.03 to 100 mm H 2 O and a counter pressure of less than 10 mm H 2 O.
Claim 18
Dependent Claim
178 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, and further comprising a plate orifice support carrying a plurality of plate orifices displaceable in relation to the pipe and disposed in the pipe of the measuring device, said pipe comprising two pipe sections.
Claim 19
Dependent Claim
178 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, and further comprising a plate orifice support carrying a plurality of plate orifices displaceable in relation to the pipe and disposed in the pipe of the measuring device, said pipe comprising two pipe sections.
Claim 20
Dependent Claim
28 words
A measuring device according to claim 11, including locking elements for sealingly locking the pipe sections disposed upstream and downstream of said plate orifice support to one another.
Claim 21
Dependent Claim
68 words
A measuring device according to claim 11, wherein said output signals include data characteristic of the plate orifices and wherein the plate orifices comprise markings corresponding to the data characteristic of the plate orifices and further comprising electronic scanning devices for interpreting the markings, said scanning devices being connected with the evaluation unit, so that the characteristic data of the plate orifices are fed to the evaluation unit.
Claim 22
Dependent Claim
201 words
A measuring device for the flow metering of fluid streams comprising at least one solid plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° at the flow orifice, and wherein the plate orifice has differently thick plate sections, a section of less thickness near the sharp edge and a section with a zone of greater thickness close to the pipe wall away from the sharp edge, including a continuous transition from the sharp edge to said zone of greater thickness.
Claim 23
Dependent Claim
201 words
A measuring device for the flow metering of fluid streams comprising at least one solid plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110° at the flow orifice, and wherein the plate orifice has differently thick plate sections, a section of less thickness near the sharp edge and a section with a zone of greater thickness close to the pipe wall away from the sharp edge, including a continuous transition from the sharp edge to said zone of greater thickness.
Claim 24
Dependent Claim
265 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, and wherein the plate has differently thick plate sections, a section of less thickness near the sharp edge and a section with a zone of greater thickness close to the pipe wall away from the sharp edge, including a continuous transition from the sharp edge to said zone of greater thickness, and wherein the plate orifice is a ring, said ring consisting of an inner ring part and an outer part disposed on the inner wall of the pipe and supporting the inner ring part, the inner and the outer ring parts being symmetrically arranged in relation to the plane passing through the sharp edge, and wherein the sharp symmetrical plate orifice edge is provided symmetrically on the inner ring part.
Claim 25
Dependent Claim
265 words
A measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of at most 110°, and wherein the plate has differently thick plate sections, a section of less thickness near the sharp edge and a section with a zone of greater thickness close to the pipe wall away from the sharp edge, including a continuous transition from the sharp edge to said zone of greater thickness, and wherein the plate orifice is a ring, said ring consisting of an inner ring part and an outer part disposed on the inner wall of the pipe and supporting the inner ring part, the inner and the outer ring parts being symmetrically arranged in relation to the plane passing through the sharp edge, and wherein the sharp symmetrical plate orifice edge is provided symmetrically on the inner ring part.
Claim 26
Independent Claim
224 words
A method for zero point adjustment of a differential pressure measuring device comprising at least one plate orifice disposed within a pipe, a fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further comprising a differential pressure measuring device comprising at least one pressure sensor disposed upstream and one pressure sensor disposed downstream of said plate orifice, said method comprising the steps of the differential pressure measuring device producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, providing a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle, said differential pressure measuring device comprising a differential pressure transducer having pressure measuring lines for connecting said transducer with the pipe and further comprising the steps of disconnecting the pressure measuring lines from the pipe and for simultaneously subjecting the pressure measuring lines to equal pressure, said differential pressure transducer comprising a plate orifice, a counter pressure sensor, an evaluation unit for producing measuring signals dependent upon the pressure value of the counter pressure sensor as a measuring signal for the flow rate of the fluid through the plate orifice.
Claim 27
Independent Claim
224 words
A method for zero point adjustment of a differential pressure measuring device comprising at least one plate orifice disposed within a pipe, a fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further comprising a differential pressure measuring device comprising at least one pressure sensor disposed upstream and one pressure sensor disposed downstream of said plate orifice, said method comprising the steps of the differential pressure measuring device producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, providing a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle, said differential pressure measuring device comprising a differential pressure transducer having pressure measuring lines for connecting said transducer with the pipe and further comprising the steps of disconnecting the pressure measuring lines from the pipe and for simultaneously subjecting the pressure measuring lines to equal pressure, said differential pressure transducer comprising a plate orifice, a counter pressure sensor, an evaluation unit for producing measuring signals dependent upon the pressure value of the counter pressure sensor as a measuring signal for the flow rate of the fluid through the plate orifice.
Claim 28
Independent Claim
235 words
A method for zero point adjustment of a differential pressure measuring device comprising at least one plate orifice disposed within a pipe, a fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further comprising a differential pressure measuring device comprising at least one pressure sensor disposed upstream and one pressure sensor disposed downstream of said plate orifice, said method comprising the steps of the differential pressure measuring device producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, providing a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle, said differential pressure measuring device comprising a differential pressure transducer having pressure measuring lines for connecting said transducer with the pipe and further comprising the steps of disconnecting the pressure measuring lines from the pipe and for simultaneously subjecting the pressure measuring lines to equal pressure, said differential pressure transducer comprising a plate orifice, a counter pressure sensor, further comprising the step of feeding the measuring signal of the differential pressure transducer read at the beginning of the zero point adjustment of differential pressure transducer for the flow rate of the fluid stream through the plate orifice to an evaluation unit.
Claim 29
Independent Claim
235 words
A method for zero point adjustment of a differential pressure measuring device comprising at least one plate orifice disposed within a pipe, a fluid being guided through said plate orifice, said plate orifice having a sharp edge defining a flow orifice and directed radially inwardly, said measuring device further comprising a differential pressure measuring device comprising at least one pressure sensor disposed upstream and one pressure sensor disposed downstream of said plate orifice, said method comprising the steps of the differential pressure measuring device producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said plate orifice, providing a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle, said differential pressure measuring device comprising a differential pressure transducer having pressure measuring lines for connecting said transducer with the pipe and further comprising the steps of disconnecting the pressure measuring lines from the pipe and for simultaneously subjecting the pressure measuring lines to equal pressure, said differential pressure transducer comprising a plate orifice, a counter pressure sensor, further comprising the step of feeding the measuring signal of the differential pressure transducer read at the beginning of the zero point adjustment of differential pressure transducer for the flow rate of the fluid stream through the plate orifice to an evaluation unit.
Claim 30
Dependent Claim
50 words
The method as recited in claim 17, wherein a measuring signal is fed to the evaluation unit, which signal is the mean value of a measuring signal available at the beginning of zero point adjustment and of a measuring signal at the resumption of measuring of the differential pressure transducer.
Claim 31
Dependent Claim
131 words
A solid plate orifice for a measuring device for the flow metering of fluid streams comprising at least one orifice plate disposed within a pipe and having an orifice defined by a sharp, radially inwardly directed edge, said fluid being guided through said orifice, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe and including first and second, in cross-section, straight converging surfaces which form the sharp edge defining the orifice, a plane passing through the sharp edge of the orifice of the plate, said first and second surfaces and therewith said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of 110° at most at the flow orifice.
Claim 32
Dependent Claim
131 words
A solid plate orifice for a measuring device for the flow metering of fluid streams comprising at least one orifice plate disposed within a pipe and having an orifice defined by a sharp, radially inwardly directed edge, said fluid being guided through said orifice, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe and including first and second, in cross-section, straight converging surfaces which form the sharp edge defining the orifice, a plane passing through the sharp edge of the orifice of the plate, said first and second surfaces and therewith said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge of 110° at most at the flow orifice.
Claim 33
Dependent Claim
19 words
A plate orifice according to claim 19, wherein the flank angle is 70° to 110° at the flow orifice.
Claim 34
Dependent Claim
19 words
A plate orifice according to claim 19, wherein the flank angle is 90° at most at the flow orifice.
Claim 35
Dependent Claim
121 words
A plate orifice for a measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice including a sharp edge defining a flow orifice and directed radially inwardly, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle of the sharp edge, forming an angle of 110° at most, comprising markings corresponding to a characteristic data of the plate orifices readable by electronic scanning devices, a means for feeding said characteristic data, by said means the characteristic data are fed to an evaluation unit.
Claim 36
Dependent Claim
121 words
A plate orifice for a measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice including a sharp edge defining a flow orifice and directed radially inwardly, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle of the sharp edge, forming an angle of 110° at most, comprising markings corresponding to a characteristic data of the plate orifices readable by electronic scanning devices, a means for feeding said characteristic data, by said means the characteristic data are fed to an evaluation unit.
Claim 37
Dependent Claim
39 words
A plate orifice according to claim 19 the plate having a portion of greater thickness close to the pipe wall outside of the sharp edge and a continuous transition from the sharp edge to the portion of greater thickness.
Claim 38
Dependent Claim
184 words
A solid plate orifice for a measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice including a sharp edge defining a flow orifice and directed radially inwardly, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge, forming an angle of 110° at most; the plate having a portion of greater thickness close to the pipe wall outside of the sharp edge and a continuous transition from the sharp edge to the portion of greater thickness, wherein the plate is a ring, said ring consisting of an inner ring part symmetrically provided with said sharp edge of the plate orifice, and a thicker outer ring part disposed on the inner wall of the pipe and supporting said inner ring part, the inner and the outer ring parts being symmetrically arranged in relation to the plane passing through the sharp edge.
Claim 39
Dependent Claim
184 words
A solid plate orifice for a measuring device for the flow metering of fluid streams comprising at least one plate orifice disposed within a pipe, said fluid being guided through said plate orifice, said plate orifice including a sharp edge defining a flow orifice and directed radially inwardly, a plane passing through the sharp edge of the flow orifice of the plate orifice, said sharp edge being symmetrical about said plane and forming a flank angle α of the sharp edge, forming an angle of 110° at most; the plate having a portion of greater thickness close to the pipe wall outside of the sharp edge and a continuous transition from the sharp edge to the portion of greater thickness, wherein the plate is a ring, said ring consisting of an inner ring part symmetrically provided with said sharp edge of the plate orifice, and a thicker outer ring part disposed on the inner wall of the pipe and supporting said inner ring part, the inner and the outer ring parts being symmetrically arranged in relation to the plane passing through the sharp edge.
Claim 40
Dependent Claim
194 words
A measuring device for the flow metering of gas streams present in internal combustion engines having at least one solid plate and having an orifice defined by a sharp, radially inwardly directed edge and a pipe, the gas being guided through said orifice disposed in said pipe and said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, a differential pressure measuring device, said device comprising pressure sensors, wherein a first pressure sensor is disposed upstream and a second pressure sensor is disposed downstream of said orifice, said differential pressure measuring device being adapted to produce output signals depending on the differential pressure forming the measuring signal for the gas flow rate of pulsating gas streams through said orifice, said orifice being symmetrically formed in a zone of the sharp edge with respect to a plane passing through the sharp edge of the orifice by first and second substantially flat surfaces which converge at an angle of no more than about 110° to thereby provide the sharp edge with a flank angle α of 110° at most at the flow orifice.
Claim 41
Dependent Claim
194 words
A measuring device for the flow metering of gas streams present in internal combustion engines having at least one solid plate and having an orifice defined by a sharp, radially inwardly directed edge and a pipe, the gas being guided through said orifice disposed in said pipe and said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, a differential pressure measuring device, said device comprising pressure sensors, wherein a first pressure sensor is disposed upstream and a second pressure sensor is disposed downstream of said orifice, said differential pressure measuring device being adapted to produce output signals depending on the differential pressure forming the measuring signal for the gas flow rate of pulsating gas streams through said orifice, said orifice being symmetrically formed in a zone of the sharp edge with respect to a plane passing through the sharp edge of the orifice by first and second substantially flat surfaces which converge at an angle of no more than about 110° to thereby provide the sharp edge with a flank angle α of 110° at most at the flow orifice.
Claim 42
Dependent Claim
21 words
A measuring device according to claim 25, wherein the flank angle α is between 70° and 110° at the flow orifice.
Claim 43
Dependent Claim
20 words
A measuring device according to claim 25, wherein the flank angle α is 90° at most at the flow orifice.
Claim 44
Dependent Claim
182 words
A measuring device for the flow metering of fluid streams having at least one solid plate having an orifice defined by a sharp, radially inwardly directed edge and a pipe, the fluid being guided through said orifice disposed in said pipe, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, a differential pressure measuring device, said device comprising pressure sensors, wherein one pressure sensor is disposed upstream and one pressure sensor is disposed downstream of said orifice, said differential pressure measuring device being adapted to produce output signals depending on the differential pressure forming the measuring signal for the fluid flow rate of pulsating fluid streams through said orifice, said orifice being symmetrically formed in the zone of the sharp edge in relation to a plane passing through the sharp edge of the orifice of the plate and having a flank angle α of the sharp edge of about 110° at most at the flow orifice defined by first and second, substantially flat, converging surfaces of the plate.
Claim 45
Dependent Claim
182 words
A measuring device for the flow metering of fluid streams having at least one solid plate having an orifice defined by a sharp, radially inwardly directed edge and a pipe, the fluid being guided through said orifice disposed in said pipe, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, a differential pressure measuring device, said device comprising pressure sensors, wherein one pressure sensor is disposed upstream and one pressure sensor is disposed downstream of said orifice, said differential pressure measuring device being adapted to produce output signals depending on the differential pressure forming the measuring signal for the fluid flow rate of pulsating fluid streams through said orifice, said orifice being symmetrically formed in the zone of the sharp edge in relation to a plane passing through the sharp edge of the orifice of the plate and having a flank angle α of the sharp edge of about 110° at most at the flow orifice defined by first and second, substantially flat, converging surfaces of the plate.
Claim 46
Dependent Claim
21 words
A measuring device according to claim 28, wherein the flank angle α is between 70° and 110° at the flow orifice.
Claim 47
Dependent Claim
20 words
A measuring device according to claim 28, wherein the flank angle α is 90° at most at the flow orifice.
Claim 48
Dependent Claim
142 words
A measuring device for metering of fluid flow, said measuring device comprising a restrictor adapted to be inserted into a longitudinal pipe section and further comprising pressure sensors disposed upstream and downstream of said restrictor, said restrictor comprising at least one solid plate having an orifice defined by a sharp, radially inwardly directed edge, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, the orifice being formed by first and second, in cross-section, straight surfaces which converge at the sharp edge with a flank angle between about 70° and 110° to thereby define a like flank angle at the orifice, said pipe section having a plane perpendicular to its longitudinal axis and positioned through said orifice, said plate comprising a plane of symmetry passing through said sharp edge.
Claim 49
Dependent Claim
142 words
A measuring device for metering of fluid flow, said measuring device comprising a restrictor adapted to be inserted into a longitudinal pipe section and further comprising pressure sensors disposed upstream and downstream of said restrictor, said restrictor comprising at least one solid plate having an orifice defined by a sharp, radially inwardly directed edge, said plate being of a substantially rigid material, at least partially defined by opposite, substantially parallel sides facing flow directions through the pipe, the orifice being formed by first and second, in cross-section, straight surfaces which converge at the sharp edge with a flank angle between about 70° and 110° to thereby define a like flank angle at the orifice, said pipe section having a plane perpendicular to its longitudinal axis and positioned through said orifice, said plate comprising a plane of symmetry passing through said sharp edge.
Claim 50
Dependent Claim
24 words
The measuring device as recited in claim 31 wherein said sharp edge comprises an angle directed radially inwardly with respect to said pipe section.
Claim 51
Dependent Claim
19 words
The measuring device as recited in claim 32 wherein said angle is at most 110° at the flow orifice.
Claim 52
Dependent Claim
17 words
The measuring device as recited in claim 32 wherein said angle is 70° at the flow orifice.
Claim 53
Dependent Claim
19 words
The measuring device as recited in claim 32 wherein said angle is at most 90° at the flow orifice.
Claim 54
Dependent Claim
22 words
The measuring device as recited in claim 31 further comprising an outer ring disposed between said pipe section and said orifice plate.
Claim 55
Dependent Claim
24 words
The measuring device as recited in claim 36 wherein said orifice plate includes a thickened portion connecting said sharp edge and said outer ring.
Claim 56
Dependent Claim
86 words
A measuring device for metering of fluid flow, said measuring device comprising a restrictor adapted to be inserted into a longitudinal pipe section and further comprising pressure sensors disposed upstream and downstream of said restrictor, said restrictor comprising at least one plate orifice having a sharp edge, said pipe section having a plane perpendicular to its longitudinal axis and positioned through said plate orifice, said plate comprising a plane of symmetry passing through said sharp edge, and wherein said orifice plate includes two parallel side faces.
Claim 57
Dependent Claim
86 words
A measuring device for metering of fluid flow, said measuring device comprising a restrictor adapted to be inserted into a longitudinal pipe section and further comprising pressure sensors disposed upstream and downstream of said restrictor, said restrictor comprising at least one plate orifice having a sharp edge, said pipe section having a plane perpendicular to its longitudinal axis and positioned through said plate orifice, said plate comprising a plane of symmetry passing through said sharp edge, and wherein said orifice plate includes two parallel side faces.
Claim 58
Dependent Claim
16 words
A measuring device according to claim 1, wherein said plate orifice comprises a one-piece plate orifice.
Claim 59
Dependent Claim
12 words
A plate orifice according to claim 19 comprising a one-piece plate orifice.
Claim 60
Dependent Claim
194 words
A measuring device for the flow metering of fluid streams comprising at least one orifice plate disposed within a pipe, said fluid being guided through a flow orifice defined by an opening in the orifice plate, the orifice plate including a solid plate constructed of a substantially rigid material defined by substantially parallel opposite sides facing in the flow directions through the pipe, first and second, radially inwardly converging, in cross-section substantially flat surfaces which converge at an angle no more than about 110° in a plane of the orifice perpendicular to the axis through the pipe and form a sharp edge in the plane of the orifice, the surfaces being symmetric relative to the orifice plane and extending from the orifice plane to the respective sides of the orifice plate, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said orifice.
Claim 61
Dependent Claim
194 words
A measuring device for the flow metering of fluid streams comprising at least one orifice plate disposed within a pipe, said fluid being guided through a flow orifice defined by an opening in the orifice plate, the orifice plate including a solid plate constructed of a substantially rigid material defined by substantially parallel opposite sides facing in the flow directions through the pipe, first and second, radially inwardly converging, in cross-section substantially flat surfaces which converge at an angle no more than about 110° in a plane of the orifice perpendicular to the axis through the pipe and form a sharp edge in the plane of the orifice, the surfaces being symmetric relative to the orifice plane and extending from the orifice plane to the respective sides of the orifice plate, said measuring device further including a differential pressure measuring device comprising at least two pressure sensors, one of said pressure sensors being disposed upstream and one pressure sensor being disposed downstream of said plate orifice, said differential pressure measuring device including means for producing output signals dependent upon the differential pressure forming a measuring signal for the fluid flow rate through said orifice.
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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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |