US3893334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Estimating the concentration of solid matter suspended in a fluid stream
Assignee: Amcor Pty Ltd
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Filing: 1974-01-16
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Granted: 1975-07-08
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Expires: 1994-01-16
Abstract
Abstract Continuously measuring the concentration of fibre suspended in a liquid stream (such as a flow of pulp to a papermaking machine) by placing in the stream a mesh screen of such mesh size as catches fibre but not smaller suspended matter, rotating the screen about an axis in its own plane and at right angles to the direction of flow so that catches of fibre are successively made by the screen and washed off it by the flow, and measuring the amplitude of the fluctuation of pressure difference between upstream and downstream of the rotating screen due to the obturating effect of the fibre ''''catch.
Inventors
- 👤 David Joseph Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:10
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/06; G01N15/0606; G01N15/0618
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
Apparatus for carrying out a method of estimating the concentration of large solids suspended in a fluid stream also containing small-grain solids, comprising a cylindrical flowchamber, a conduit for continuously removing part of the fluid stream for measurement, a first constant-head device for supplying at least some of said part to one end of the chamber, a second constant-head device for removing fluid from thE other end of the chamber, a sieve movable in an intermediate part of the chamber so as selectively to catch solids from the substantially uniform flow that is due to a pressure drop between the constanthead devices, manometer means for continuously sensing the pressure difference between upstream and downstream of the sieve, and means for deriving therefrom a measure of the relevant solids concentration.
Claim 2
Dependent Claim
129 words
Apparatus for carrying out a method of estimating the concentration of large solids suspended in a fluid stream also containing small-grain solids, comprising a cylindrical flowchamber, a conduit for continuously removing part of the fluid stream for measurement, a first constant-head device for supplying at least some of said part to one end of the chamber, a second constant-head device for removing fluid from thE other end of the chamber, a sieve movable in an intermediate part of the chamber so as selectively to catch solids from the substantially uniform flow that is due to a pressure drop between the constanthead devices, manometer means for continuously sensing the pressure difference between upstream and downstream of the sieve, and means for deriving therefrom a measure of the relevant solids concentration.
Claim 3
Dependent Claim
46 words
Apparatus as claimed in claim 1 wherein the sieve is of substantially the same form as the crosssection of the chamber, means being provided for uniformly rotating the sieve about an axis in its plane and substantially at right angles to the axis of the chamber.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 2 characterized in that the axis of the chamber is vertical and the flow therein is upwards, the first and second constant-head devices being respectively above and below the top and bottom ends of the chamber.
Claim 5
Dependent Claim
38 words
Apparatus according to claim 1 wherein the manometer means comprise open-tube manometers placed side-by-side to enable the relevant concentration to be conveniently read-off by direct observation of the maximum difference in levels over a cycle of the sieve.
Claim 6
Independent Claim
91 words
A method of estimating the concentration of solids suspended in a fluid stream comprising the steps of providing a flat sieve of such mesh size as will catch said solid matter but allow substantially unimpeded passage of the fluid and small suspended matter therethrough, rotating the sieve about an axis in its plane and substantially perpendicular to the direction of flow of the stream to bring the sieve into a position transverse to the stream, and sensing the rate of increase of pressure drop between upstream and downstream of the sieve.
Claim 7
Independent Claim
91 words
A method of estimating the concentration of solids suspended in a fluid stream comprising the steps of providing a flat sieve of such mesh size as will catch said solid matter but allow substantially unimpeded passage of the fluid and small suspended matter therethrough, rotating the sieve about an axis in its plane and substantially perpendicular to the direction of flow of the stream to bring the sieve into a position transverse to the stream, and sensing the rate of increase of pressure drop between upstream and downstream of the sieve.
Claim 8
Independent Claim
101 words
A method of estimating the concentration of solids suspended in a fluid stream comprising the steps of providing a flat sieve of such mesh size as will catch said solid matter but allow substantially unimpeded passage of the fluid and small suspended matter therethrough, rotating the sieve about an axis in its plane and substantially perpendicular to the direction of flow of the stream thereby to move the sieve in a regular and periodic manner to and from a position transverse to the stream, and sensing the amplitude of a correspondingly fluctuating pressure differential between upstream and downstream of the sieve.
Claim 9
Independent Claim
101 words
A method of estimating the concentration of solids suspended in a fluid stream comprising the steps of providing a flat sieve of such mesh size as will catch said solid matter but allow substantially unimpeded passage of the fluid and small suspended matter therethrough, rotating the sieve about an axis in its plane and substantially perpendicular to the direction of flow of the stream thereby to move the sieve in a regular and periodic manner to and from a position transverse to the stream, and sensing the amplitude of a correspondingly fluctuating pressure differential between upstream and downstream of the sieve.
Claim 10
Independent Claim
119 words
A method of estimating the concentration of large solids suspended in a fluid stream also carrying small-grain solids, comprising the steps of interposing a flat mesh screen which is rotatable about an axis in its plane and substantially perpendicular to the direction of flow of the stream, rotating the screen about said axis so as to move the screen in a regular and periodic manner into and out of a position in which it selectively catches large solids, thereby to impose a correspondingly regular and periodic varying pressure differential of substantially constant amplitude between two parts of the stream, and utilizing the effect of said pressure differential to estimate concentration of large solids as a function of said amplitude.
Claim 11
Independent Claim
119 words
A method of estimating the concentration of large solids suspended in a fluid stream also carrying small-grain solids, comprising the steps of interposing a flat mesh screen which is rotatable about an axis in its plane and substantially perpendicular to the direction of flow of the stream, rotating the screen about said axis so as to move the screen in a regular and periodic manner into and out of a position in which it selectively catches large solids, thereby to impose a correspondingly regular and periodic varying pressure differential of substantially constant amplitude between two parts of the stream, and utilizing the effect of said pressure differential to estimate concentration of large solids as a function of said amplitude.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |