US3802801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for operating an aerodynamic pressure-wave machine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1972-02-02
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Granted: 1974-04-09
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Expires: 1992-02-02
Abstract
Abstract An aerodynamic pressure-wave machine which includes a rotor provided with a circumferential array of longitudinally extending open-ended cells rotates within the middle portion of a casing, the end portions of the casing being provided with high-pressure openings and low-pressure openings confronting the opposite ends of the rotor cells for expansion of an energy-laden gas as it flows through the cells which effects compression of another gas, such as air, as it flows through the cells. Leakage gas flowing from the high-pressure openings to the low-pressure openings is collected, at least in part, and is fed back into the gas-dynamic process for utilization of the energy still contained within them.
Inventors
- 👤 A Wunsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:07
CPC Classifications
F; F04; F04F; F04F13/00; F02; F02B; F02B33/00; F02B33/32; F02B33/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
249 words
An aerodynamic pressure-wave machine comprising a cylindrical rotor provided with a circumferential array of longitudinally extending open-ended cells and which is mounted for rotation about its axis within the middle portion of a cylindrical casing with a radial clearance gap therebetween, the end portions of said casing facing the opposite ends of said rotor including at least one high-pressure inlet opening and one low-pressure outlet opening for an energy-laden gas giving up energy in the cells and at least one high-pressure outlet opening and one low-pressure inlet opening for a gas such as air to be compressed within the cells, each end portion of said casing having at least one highpressure opening and at least one low-pressure opening which are spaced circumferentially apart, means providing a gas-leakage collection recess in at least one end portion of said casing opening in the direction of and in communication with the cell ends and which extends radially to the clearance gap between said rotor and casing for collecting leakage-gas flowing in a circumferential direction between a high-pressure opening and a low-pressure opening in a axial clearance gap existing between the end portion of said casing and the corresponding end of said rotor and flowing also in a radially outward direction to said radial clearance gap existing between the periphery of said rotor and the middle portion of said casing, the leakage-gas so collected serving to charge said recess and being thereafter discharged therefrom into said rotor cells to give up its energy.
Claim 2
Dependent Claim
249 words
An aerodynamic pressure-wave machine comprising a cylindrical rotor provided with a circumferential array of longitudinally extending open-ended cells and which is mounted for rotation about its axis within the middle portion of a cylindrical casing with a radial clearance gap therebetween, the end portions of said casing facing the opposite ends of said rotor including at least one high-pressure inlet opening and one low-pressure outlet opening for an energy-laden gas giving up energy in the cells and at least one high-pressure outlet opening and one low-pressure inlet opening for a gas such as air to be compressed within the cells, each end portion of said casing having at least one highpressure opening and at least one low-pressure opening which are spaced circumferentially apart, means providing a gas-leakage collection recess in at least one end portion of said casing opening in the direction of and in communication with the cell ends and which extends radially to the clearance gap between said rotor and casing for collecting leakage-gas flowing in a circumferential direction between a high-pressure opening and a low-pressure opening in a axial clearance gap existing between the end portion of said casing and the corresponding end of said rotor and flowing also in a radially outward direction to said radial clearance gap existing between the periphery of said rotor and the middle portion of said casing, the leakage-gas so collected serving to charge said recess and being thereafter discharged therefrom into said rotor cells to give up its energy.
Claim 3
Dependent Claim
32 words
The invention as defined in claim 1 wherein the leakage-gas so collected in said recess is discharged therefrom into said rotor cells to achieve a pre-compression of the gas to be compressed.
Claim 4
Dependent Claim
30 words
The invention as defined in claim 1 wherein the leakage-gas so collected in said recess is discharged therefrom into said rotor cells to improve scavenging thereof in the low-pressure zone.
Claim 5
Dependent Claim
63 words
The invention as defined in claim 1 wherein the hub portion of said rotor is provided with an axially extending cavity opening to the end of the rotor at which said gas-leakage collection recess is located, and said recess extends in a radially inward direction to establish communication with said cavity which latter likewise functions to receive gas leakage from said high-pressure opening.
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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |