US3823602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling device
Assignee: ALUMINUM AND CHEM CORP
•
Filing: 1972-11-20
•
Granted: 1974-07-16
•
Expires: 1992-11-20
Abstract
Abstract An improved centrifuge sampling device for the capture and size segregation of particles less than 2 microns in diameter from a fluid containing same. The device comprises a rotating body and cap which define a spirally shaped conduit having from 1.5 to about 2.5 convolutions. The particulate-laden fluid as sampled is split by the sampler into a large stream and a small stream. The large stream is directed to the beginning of the spiral conduit where entrained particles are removed by centrifugal forces. The smaller stream is introduced into the larger stream contained in the spiral conduit when substantially all particulate matter has been removed from the larger stream and the flow has been rendered laminar.
Inventors
- 👤 P Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N1/2211; B; B04; B04B; B04B1/00; B04B1/04; B04B5/00; B04B5/04; B04B5/0442; B04B2005/045; G01N2001/222; G01N2001/2223
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
172 words
A sampling device for capturing and segregating particulate matter having an equivalent aerodynamic diameter from about 0.05 to about 2.0 microns from a fluid containing same comprising: A. a generally cylindrically shaped member having a rotor body and a rotor cap, said body and cap defining a generally spirally shaped conduit having from about 1.5 to about 2.5 convolutions, the radius of said conduit gradually increasing and the beginning of said conduit being disposed a distance away from the axis of rotation of said rotor body and cap; B. means to introduce said fluid stream into said cylindrically shaped member; C. means to split said fluid into small and large streams; D. means to introduce said large fraction into the beginning of the first convolution of said spirally disposed conduit; E. means to introduce said smaller fraction inTo the second half of the first convolution of said spirally shaped conduit; F. means to exhaust said combined large and small fractions from said conduit; and G. means to rotate said cylindrically shaped member.
Claim 2
Dependent Claim
172 words
A sampling device for capturing and segregating particulate matter having an equivalent aerodynamic diameter from about 0.05 to about 2.0 microns from a fluid containing same comprising: A. a generally cylindrically shaped member having a rotor body and a rotor cap, said body and cap defining a generally spirally shaped conduit having from about 1.5 to about 2.5 convolutions, the radius of said conduit gradually increasing and the beginning of said conduit being disposed a distance away from the axis of rotation of said rotor body and cap; B. means to introduce said fluid stream into said cylindrically shaped member; C. means to split said fluid into small and large streams; D. means to introduce said large fraction into the beginning of the first convolution of said spirally disposed conduit; E. means to introduce said smaller fraction inTo the second half of the first convolution of said spirally shaped conduit; F. means to exhaust said combined large and small fractions from said conduit; and G. means to rotate said cylindrically shaped member.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said rotor body is from about 2 to about 6 inches in diameter.
Claim 4
Dependent Claim
36 words
The device of claim 1 wherein the spirally disposed conduit has a generally rectangular shaped cross section with a width from about 0.2 to about 1.5 centimeters and a depth of about 0.5 to 30 centimeters.
Claim 5
Dependent Claim
21 words
The device of claim 3 wherein a thin collector strip is positioned on the outer surface of said spirally disposed conduit.
Claim 6
Dependent Claim
31 words
The device of claim 1 wherein means to split said fluid into large and small streams provide a volume ratio of large to small streams from about 5:1 to about 20:1.
Claim 7
Dependent Claim
16 words
The device of claim 1 wherein the width of said spirally disposed conduit is gradually increasing.
Claim 8
Independent Claim
160 words
A method of capturing and segregating particulate matter having an equivalent aerodynamic diameter from about 0.05 to about 2.0 microns from a fluid containing same comprising: A. splitting said fluid into a small and large fraction, the volume ratio of large to small stream ranging from about 5:1 to 20:1; B. passing said larger fraction through at least onehalf convolution of a rapidly rotating, spirally shaped conduit to generate a laminar gaseous flow therein and to remove substantially all particulate matter from said larger fraction; C. introducing said smaller fraction into said larger fraction after the flow of said larger fraction has become essentially laminar and substantially all particulate matter has been removed therefrom; D. passing said combined streams through at least one complete convolution of said rapidly rotating, spirally shaped conduit to remove and segregate according to size said particulate matter having an equivalent aerodynamic diameter of about 0.05 to about 2.0 microns; and E. discharging said combined streams.
Claim 9
Independent Claim
160 words
A method of capturing and segregating particulate matter having an equivalent aerodynamic diameter from about 0.05 to about 2.0 microns from a fluid containing same comprising: A. splitting said fluid into a small and large fraction, the volume ratio of large to small stream ranging from about 5:1 to 20:1; B. passing said larger fraction through at least onehalf convolution of a rapidly rotating, spirally shaped conduit to generate a laminar gaseous flow therein and to remove substantially all particulate matter from said larger fraction; C. introducing said smaller fraction into said larger fraction after the flow of said larger fraction has become essentially laminar and substantially all particulate matter has been removed therefrom; D. passing said combined streams through at least one complete convolution of said rapidly rotating, spirally shaped conduit to remove and segregate according to size said particulate matter having an equivalent aerodynamic diameter of about 0.05 to about 2.0 microns; and E. discharging said combined streams.
Claim 10
Dependent Claim
18 words
The method of claim 7 wherein said conduit is rotating from about 2,000 to 20,000 revolutions per second.
Claim 11
Dependent Claim
25 words
The method of claim 7 wherein the total flow of fluid into said spirally shaped conduit ranges from about 2 to 100 milliliters per second.
References Cited (Backward Citations)
GB740128A
Cited
US2956434A
Cited
US2926783A
Cited
US2932394A
Cited
US3074627A
Cited
US3237455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |