Patent US3973872A successfully refreshed from Google Patents.
US3973872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal compressor
Assignee: Individual
•
Filing: 1975-08-01
•
Granted: 1976-08-10
•
Expires: 1995-08-01
Abstract
Abstract The compressor comprises an impeller and a diffuser with blades (vanes) of a constant thickness, arranged around the circumference of the impeller and diffuser. In the zone between the entrance edge of each blade (vane) and its center in a radial direction the angle between the pitch line in the longitudinal section of each blade (vane) and the tangent line to an imaginary circle drawn through any point of said pitch line from the center of the impeller axis of rotation is equal to the entrance angle of the blades (vanes). In the remaining zone of the blade (vane) this angle varies according to a quadratic parabola. Each pair of adjacent blades has blades of a different length, the exit edges of the blades being located on one imaginary circle drawn from the center of impeller axis of rotation while the entrance edges of these blades lie on two imaginary circles drawn from the same center.
Inventors
- 👤 Konstantin Pavlovich Seleznev
- 👤 Jury Borisovich Galerkin
- 👤 Leonid Yakovlevich Strizhak
- 👤 Anatoly Vasilievich Zuev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:47
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/52; F05D2250/70; Y; Y10; Y10S; Y10S416/00; Y10S416/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A centrifugal compressor comprising: an impeller; a diffuser installed concentrically with said impeller; blades equispaced around the circumference of said impeller and forming channels, the ratio of the length of each blade along its pitch line to the main arithmetical width of said blade channel being equal to 3.8 - 5.6 and said blade being shaped in such a manner that in the zone between the entrance edge of said blade and its center in the radial direction the angle between the pitch line in the longitudinal section of said blade and the tangent line to an imaginary circle drawn through any point of said pitch line from the center of the axis of rotation of said impeller is equal to the entrance angle of said blade while in the remaining zone of said blade this angle varies according to a quadratic parabola.
Claim 2
Dependent Claim
143 words
A centrifugal compressor comprising: an impeller; a diffuser installed concentrically with said impeller; blades equispaced around the circumference of said impeller and forming channels, the ratio of the length of each blade along its pitch line to the main arithmetical width of said blade channel being equal to 3.8 - 5.6 and said blade being shaped in such a manner that in the zone between the entrance edge of said blade and its center in the radial direction the angle between the pitch line in the longitudinal section of said blade and the tangent line to an imaginary circle drawn through any point of said pitch line from the center of the axis of rotation of said impeller is equal to the entrance angle of said blade while in the remaining zone of said blade this angle varies according to a quadratic parabola.
Claim 3
Dependent Claim
19 words
A centrifugal compressor according to claim 1 wherein the diffuser has vanes similar in shape to the impeller blades.
Claim 4
Dependent Claim
93 words
A centrifugal compressor according to claim 1 wherein the blades in each pair of adjacent impeller blades are of different length, their exit edges being located on an imaginary circle drawn from the center of the impeller axis of rotation while the diameter of an imaginary circle drawn from the center of the impeller axis of rotation and joining the entrance edges of the shorter blades is equal to 1.2 - 1.3 of the diameter of the imaginary circle drawn from the same center and joining the entrance edges of the other blades.
Claim 5
Dependent Claim
96 words
A centrifugal compressor according to claim 2 wherein the vanes in each pair of adjacent diffuser vanes are of different length, the exit edges of the vanes being located on an imaginary circle drawn from the center of the impeller axis of rotation while the diameter of an imaginary circle drawn from the center of the impeller axis of rotation and joining the entrance edges of the shorter vanes is equal to 1.2 - 1.3 of the diameter of the imaginary circle drawn from the same center and joining the entrance edges of the other vanes.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |