US5498273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle separation
Assignee: Rolls Royce PLC
•
Filing: 1994-11-10
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Granted: 1996-03-12
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Expires: 2014-11-10
Abstract
Abstract A vortex tube including an annular downstream scavenge duct is provided with a number of occluding members spaced circumferentially around the upstream entrance to the scavenge duct so as to restrict the entrance area of the duct. The occluding members are each generally triangular in section, are each attached to the wall of the vortex tube, and taper upstream from the entrance to the scavenge duct.
Inventors
- 👤 Darrell L. Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:31
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; B04; B04C; B04C3/00; B04C3/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
A vortex separator for separating particulate matter from a gas stream, the separator comprising: a first tube defining a gas flow passage having an upstream inlet section and a downstream outlet section, at least one vane disposed in the region of the upstream section of the tube for imparting vorticular motion on a gas flow entering the tube, flow dividing means formed by an exit tube disposed co-axially with the downstream outlet section of the first tube and spaced radially inwards thereof to form an outer annular scavenge duct and inwardly thereof a co-axial clean flow outlet, and a plurality of elongate tapering occluding members located against the wall of the first tube and extending upstream of the annular scavenge duct so as to partially obstruct gas flow entering said annular scavenge duct.
Claim 2
Dependent Claim
133 words
A vortex separator for separating particulate matter from a gas stream, the separator comprising: a first tube defining a gas flow passage having an upstream inlet section and a downstream outlet section, at least one vane disposed in the region of the upstream section of the tube for imparting vorticular motion on a gas flow entering the tube, flow dividing means formed by an exit tube disposed co-axially with the downstream outlet section of the first tube and spaced radially inwards thereof to form an outer annular scavenge duct and inwardly thereof a co-axial clean flow outlet, and a plurality of elongate tapering occluding members located against the wall of the first tube and extending upstream of the annular scavenge duct so as to partially obstruct gas flow entering said annular scavenge duct.
Claim 3
Dependent Claim
29 words
A vortex separator as claimed in claim 1 wherein there is provided a plurality of said occluding members spaced circumferentially around the tube upstream of the flow dividing means.
Claim 4
Dependent Claim
23 words
A vortex separator as claimed in claim 2 wherein adjacent occluding members abut at the upstream end of the radially outer flow outlet.
Claim 5
Dependent Claim
24 words
A vortex separator as claimed in claim 1, wherein the occluding members generally have triangular cross-sections transverse to the axial direction of the ducts.
Claim 6
Dependent Claim
45 words
A vortex separator as claimed in claim 2, wherein the plurality of occluding members is dimensioned so that the ratio of the cross-section area of the partially occluded annular scavenge duct outlet to the cross-section area of the non-occluded clean flow outlet is about 1:9.
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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) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |