CA1104371A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Inclined plate type flowmeters for measurement of flow through a duct
Assignee: Siemens Canada Ltd
•
Filing: 1978-11-30
•
Granted: 1981-07-07
•
Expires: 1998-11-30
Abstract
Abstract ABSTRACT OF THE INVENTION An inclined plate type flowmeter measures the horizontal reaction resulting from solids striking the plate by using long-itudinally spaced pairs of strain gauges to detect the difference in bending moments occuring at longitudinally spaced points on a cantilever supporting the plate against horizontal movement. The difference of the outputs of two such flowmeters at the top and bottom of a vertical section of conduit carrying air entrain-ed solids provides an output proportional to the flow rate of the solids.
Inventors
- 👤 Milton R. Schindel
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-08 12:01
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/28; G01F1/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
220 words
A flowmeter for particulate solids comprising a hous-ing defining an entrance for a stream of particulate material, at least one plate situated in the housing, downstream of the entrance so as to deflect the stream of material passing through the opening, the at least one plate being inclined relative to the direction of flow of said material through said entrance so as to sustain a reaction force having a component perpendicular to said flow direction, means supporting the at least one plate comprising at least one cantilever extending between said at least one plate and a location fixed in relation to said housing so as to sustain said perpendicular reaction force component, each such cantilever extending perpendicularly relative to said force component, a transducer system comprising strain gauges mounted on said at least one cantilever in two longitudinally spaced pairs, the gauges in each pair being at opposite sides of the cantilever with respect to the direction of said perpendicular force component, said gauge pairs being individually responsive to bending strains in the beam caused by said perpendicular force component and the gauges being electrically connected in a normally balanced bridge circuit such that imbalance of the bridge is proportional to said perpendicular force component, and means to measure such imbalance and hence the rate of flow of said solids.
Claim 2
Dependent Claim
220 words
A flowmeter for particulate solids comprising a hous-ing defining an entrance for a stream of particulate material, at least one plate situated in the housing, downstream of the entrance so as to deflect the stream of material passing through the opening, the at least one plate being inclined relative to the direction of flow of said material through said entrance so as to sustain a reaction force having a component perpendicular to said flow direction, means supporting the at least one plate comprising at least one cantilever extending between said at least one plate and a location fixed in relation to said housing so as to sustain said perpendicular reaction force component, each such cantilever extending perpendicularly relative to said force component, a transducer system comprising strain gauges mounted on said at least one cantilever in two longitudinally spaced pairs, the gauges in each pair being at opposite sides of the cantilever with respect to the direction of said perpendicular force component, said gauge pairs being individually responsive to bending strains in the beam caused by said perpendicular force component and the gauges being electrically connected in a normally balanced bridge circuit such that imbalance of the bridge is proportional to said perpendicular force component, and means to measure such imbalance and hence the rate of flow of said solids.
Claim 3
Dependent Claim
31 words
A flowmeter according to claim 1, wherein the plate is rigidly attached to one end of the cantilever, and a rigid mounting is provided for the other end of the cantilever.
Claim 4
Dependent Claim
29 words
A flowmeter according to claim 2, wherein the rigid mounting is at the opposite side of the plate to the point of attach-ment of the beam to the plate.
Claim 5
Dependent Claim
40 words
A flowmeter according to claim 1, wherein the or each cantilever is a beam, and the depth of the beam in a direction parallel to the direction of motion of solids entering the meter is much greater than its thickness.
Claim 6
Dependent Claim
35 words
A flowmeter according to claim 1, wherein the or each cantilever comprises, for at least part of its length, two spaced members having weakened portions therein, the strain gauges being mounted at said weakened portions.
Claim 7
Dependent Claim
27 words
A flowmeter according to claim 5, wherein the spaced members are opposite sides of a rectangular frame, and said sides are notched to form said weakened portions.
Claim 8
Dependent Claim
36 words
A flowmeter according to claim 5, wherein the spaced members are opposite sides of a bar penetrated between said sides by two overlapping bores, the strain gauges being mounted exter-nally of said bar adjacent said bores.
Claim 9
Dependent Claim
43 words
A flowmeter according to claim 1, wherein the plate is supported in the housing partially by the at least one cantilever, and partially by means providing no restraint against movement of the plate in response to the perpendicular component of the reaction force.
Claim 10
Dependent Claim
49 words
A flowmeter according to claim 8, wherein the plate is suspended within the housing from a frame surrounding the en-trance, an upper edge of the plate being connected to the frame by the at least one cantilever, and the lower edge being connec-ted to the frame by suspension cables.
Claim 11
Dependent Claim
177 words
A flowmeter for gas entrained solids, comprising a horizontal conduit, a vertical conduit, a first housing of enlar-ged cross-section relative to said upper horizontal conduit con-necting the upper horizontal conduit and the upper end of verti-cal conduit, a second housing of enlarged cross-section relative to said vertical conduit and connecting with the lower end of said vertical conduit, at least one deflection plate supported in said first housing and inclined so as to intercept solids entering the housing from the horizontal conduit and deflect them in a direc-tion perpendicular to said horizontal and vertical conduits, at least one deflection plate supported in said second housing and inclined so as to intercept solids entering the housing and de-flect them in a direction perpendicular to said vertical conduit, means to sense the magnitude of the horizontal reaction developed at the at least one deflection plate in the upper housing, means to sense the magnitude of the horizontal reaction developed at the at least one deflection plate in the lower housing, and means to measure the difference between said magnitudes.
Claim 12
Dependent Claim
177 words
A flowmeter for gas entrained solids, comprising a horizontal conduit, a vertical conduit, a first housing of enlar-ged cross-section relative to said upper horizontal conduit con-necting the upper horizontal conduit and the upper end of verti-cal conduit, a second housing of enlarged cross-section relative to said vertical conduit and connecting with the lower end of said vertical conduit, at least one deflection plate supported in said first housing and inclined so as to intercept solids entering the housing from the horizontal conduit and deflect them in a direc-tion perpendicular to said horizontal and vertical conduits, at least one deflection plate supported in said second housing and inclined so as to intercept solids entering the housing and de-flect them in a direction perpendicular to said vertical conduit, means to sense the magnitude of the horizontal reaction developed at the at least one deflection plate in the upper housing, means to sense the magnitude of the horizontal reaction developed at the at least one deflection plate in the lower housing, and means to measure the difference between said magnitudes.
Claim 13
Dependent Claim
122 words
A flowmeter according to claim 10, wherein the means to sense the magnitudes of the horizontal reactions developed at the plates in the housings comprises cantilevers providing the sole restraint of the plate against said horizontal reactions, the cantilevers each being equipped with a transducer system compris-ing strain gauges mounted on said cantilevers in two longitudinal-ly spaced pairs, the gauges in each pair being at opposite sides of said cantilever with respect to the direction of the horizontal reaction being sensed, the gauge pairs being individually respon-sive to bending strains in the beam caused by said horizontal re-action and the gauges being electrically connected in a normally balanced bridge circuit, such that imbalance of the bridge is pro-portional to said horizontal reaction.
Claim 14
Dependent Claim
92 words
In a flowmeter for particulate solids comprising a plate inclined to the direction of flow of solids entering the flowmeter, and means to sense the magnitude of the reaction devel-oped at said plate in a direction perpendicular to said direction of flow, the improvement comprising at least one cantilever providing the sole restraint to movement of said plate in response to said reaction, and a trans-ducer system mounted on said cantilever, said transducer system comprising means to sense the difference between the bending mo-ments of said cantilever at two longitudinally spaced points.
Claim 15
Dependent Claim
92 words
In a flowmeter for particulate solids comprising a plate inclined to the direction of flow of solids entering the flowmeter, and means to sense the magnitude of the reaction devel-oped at said plate in a direction perpendicular to said direction of flow, the improvement comprising at least one cantilever providing the sole restraint to movement of said plate in response to said reaction, and a trans-ducer system mounted on said cantilever, said transducer system comprising means to sense the difference between the bending mo-ments of said cantilever at two longitudinally spaced points.
Claim 16
Dependent Claim
42 words
A flowmeter according to claim 12, wherein the trans-ducer system comprises two longitudinally spaced pairs of strain gauges, the strain gauges of each pair being mounted at opposite sides of the cantilever, and the strain gauges are connected in a bridge circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.