US3743436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffuser for centrifugal compressor
Assignee: Avco Corp
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Filing: 1971-07-13
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Granted: 1973-07-03
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Expires: 1991-07-13
Abstract
Abstract The disclosure illustrates a diffuser of the ''''pipe diffuser'''' type in which the intersecting inlet flow passages are formed by the volume swept by a cylinder displaced from a first position in which its longitudinal axis is tangent to a reference circle to a second position. This enables the diffuser to handle a given flow rate with a minimum number of passages and provide increased flow range for the stage.
Inventors
- 👤 Connor J O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:06
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
A diffuser for a centrifugal impeller, said diffuser comprising a generally annular housing surrounding the periphery of and coaxial with the axis of said centrifugal impeller, said housing having a plurality of intersecting inlet passageways, each of said passageways intersecting at their inlet ends and defined by the volume of housing swept by a cylinder rotated from a first position having its longitudinal axis tangent to a reference circle normal to the axis of said impeller and lying in the plane formed by said reference circle to a second predetermined position wherein the axis of said cylinder is rotated in a direction parallel to said reference plane and rotated in a direction normal to said plane, thereby forming curved side walls and upper and lower flat midsections connecting said side walls, said midsections being inclined with respect to the plane of said reference circle whereby adjacent passages intersect to form scalloped leading edges nonsymmetrical with respect to a longitudinal axis of the passageway, the longitudinal axis of said cylinder being rotated in the direction normal to the reference plane about the point at which the longitudinal axis of the cylinder in the first and second positions intersect.
Claim 2
Dependent Claim
197 words
A diffuser for a centrifugal impeller, said diffuser comprising a generally annular housing surrounding the periphery of and coaxial with the axis of said centrifugal impeller, said housing having a plurality of intersecting inlet passageways, each of said passageways intersecting at their inlet ends and defined by the volume of housing swept by a cylinder rotated from a first position having its longitudinal axis tangent to a reference circle normal to the axis of said impeller and lying in the plane formed by said reference circle to a second predetermined position wherein the axis of said cylinder is rotated in a direction parallel to said reference plane and rotated in a direction normal to said plane, thereby forming curved side walls and upper and lower flat midsections connecting said side walls, said midsections being inclined with respect to the plane of said reference circle whereby adjacent passages intersect to form scalloped leading edges nonsymmetrical with respect to a longitudinal axis of the passageway, the longitudinal axis of said cylinder being rotated in the direction normal to the reference plane about the point at which the longitudinal axis of the cylinder in the first and second positions intersect.
References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |