US3572962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stator blading for noise reduction in turbomachinery
Assignee: Canadian Patents and Development Ltd
•
Filing: 1969-06-02
•
Granted: 1971-03-30
•
Expires: 1989-06-02
Abstract
Abstract The invention relates to a configuration of stator blading, particularly for the reduction of noise in axial compressors. Each stator blade is comprised of two or three sections, with one of the sections being spaced circumferentially from the other section or sections. Circumferentially, disposed webs connect the sections to one another. The sectional blade divides the sound source at each blade into separate sound sources which are out of phase with one another. Sound waves at different phases interfere destructively so that the total sound output is reduced.
Inventors
- 👤 Tony F W Embleton
- 👤 George J Thiessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:22
CPC Classifications
F; F01; F01D; F01D9/00; F01D9/02; F01D9/04; F01D9/041; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/142; F01D5/16; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S415/00; Y10S415/914; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A stator blade for use in turbomachinery of the type having a stator including a plurality of circumferentially disposed stator blades and a rotor including a plurality of circumferentially disposed rotor blades, each of said stator blades, comprising a plurality of adjoining blade sections, each blade section having a leading edge and a trailing edge, at least one of said sections being spaced circumferentially from the other of said sections at least at the leading edge thereof a distance of greater than 0.25 and less than 0.5 of the distance between adjacent rotor blades, such that the leading edges define a stepped profile, and web means connecting said spaced section to the other of said sections, whereby the noise emanating from the source associated with one of said sections interferes destructively with the noise emanating from the source associated with another of said sections, so as to effectively reduce the total noise output.
Claim 2
Dependent Claim
153 words
A stator blade for use in turbomachinery of the type having a stator including a plurality of circumferentially disposed stator blades and a rotor including a plurality of circumferentially disposed rotor blades, each of said stator blades, comprising a plurality of adjoining blade sections, each blade section having a leading edge and a trailing edge, at least one of said sections being spaced circumferentially from the other of said sections at least at the leading edge thereof a distance of greater than 0.25 and less than 0.5 of the distance between adjacent rotor blades, such that the leading edges define a stepped profile, and web means connecting said spaced section to the other of said sections, whereby the noise emanating from the source associated with one of said sections interferes destructively with the noise emanating from the source associated with another of said sections, so as to effectively reduce the total noise output.
Claim 3
Dependent Claim
15 words
The stator blade according to claim 1 wherein said web means are disposed substantially circumferentially.
Claim 4
Dependent Claim
47 words
The stator according to claim 2 wherein each blade section has a convex surface and said plurality of blade sections consists of a central section and two outer sections, said central section being spaced circumferentially outwardly from said convex surface of each of said two outer sections.
Claim 5
Dependent Claim
33 words
The stator blade according to claim 3 wherein the trailing edge of said spaced section is spaced circumferentially from the other of said sections such that said trailing edges define a stepped profile.
Claim 6
Dependent Claim
36 words
The stator according to claim 3 wherein the trailing edge of the spaced section is substantially contiguous with the trailing edges of the other of said sections, such that the trailing edges define a linear profile.
References Cited (Backward Citations)
US197437A
Cited
US329822A
Cited
GB189914255A
Cited
GB191111785A
Cited
US1872749A
Cited
GB668039A
Cited
US2920864A
Cited
US3178099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |