US3922109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for flow machines
Assignee: MTU Aero Engines AG
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Filing: 1973-08-29
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Granted: 1975-11-25
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Expires: 1993-08-29
Abstract
Abstract A rotor wheel for flow machines, method of making same, and fixture for holding same during manufacture, wherein a rotor disk of a relatively deformable material is connected by brazing with a plurality of rotor blades seated in respective slots in a rotor disk. The slots and blade root portions are configured so as to exhibit different angled dove-tailed slot portions radially spaced from one another to as to accommodate uneven temperature distribution through the rotor disk. Intermediate the airfoil portion and root portion of the blades, widening portions are provided which abut adjacent widening portions to form an annulus for a cooling medium between the rotor disk and the blades. Recesses are formed in the dovetail slots for accommodating the brazing alloy adjacent lateral facing sides of the blade roots and rotor disk slot such that, upon heating of the rotor disk, the alloy can flow from the recesses to the gap between the blade and slot. The method of manufacture includes heating the assembled disk and blades and then rapidly rotating same so as to effect a centrifugal flow of the brazing material to the desired locations, with a further later cooling of the assembly during the rotation. The holding fixture includes a pair of sealing disks which clamp opposite sides of the rotor disk and are rotatable with the rotor disk during the brazing operation. The fixture also includes a hoop which engages with the widening portions of the blades to hold them in position during the manufacturing operation.
Inventors
- 👤 Hermann Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:29
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3007
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
327 words
A rotor wheel for flow machines comprising: a rotor disk made of relatively deformable material and including a plurality of radially extending blade accepting dovetail slots, and a plurality of rotor blades fixedly seated in respective ones of said slots by weld means, said blades being made of a highly heat-resistant material different from the material of the rotor disk, each of said blades including an airfoil portion, a root portion and a collar-type widening portion between said root and airfoil portions, wherein the widening portions of adjacent blades abut one another to form a closed hoop around the circumference of and spaced from the rotor disk, said hoop and the outer circumference of the rotor disk forming an annulus which is intersected by parts of respective root portions of the blades, wherein said weld means is brazing material, wherein each of said blade root portions have a plurality of lateral faces which face away from the radius extending from the center of the disk through the center portion of the associated blade, said lateral faces being arranged in pairs with each lateral face of a pair arranged at the same radial distance from the center of the disk, each blade including at least two of said pairs of lateral faces spaced radially from one another, the lateral faces of a pair being inclined toward one another and being engageable with respective sidewalls of respective dovetail slot portions of the respective slot accommodating the respective blade, wherein the lateral faces of each pair are arranged at opposite sides of and inclined at a similar angle with respect to a disk radius through the respective blade, and wherein the angles of inclination for the lateral faces of one pair are different than for those of an adjacent radially spaced pair of lateral faces for the same respective blade, whereby the temperature gradient through the root portion of said blade can be accommodated by the respective different angular inclinations.
Claim 2
Dependent Claim
327 words
A rotor wheel for flow machines comprising: a rotor disk made of relatively deformable material and including a plurality of radially extending blade accepting dovetail slots, and a plurality of rotor blades fixedly seated in respective ones of said slots by weld means, said blades being made of a highly heat-resistant material different from the material of the rotor disk, each of said blades including an airfoil portion, a root portion and a collar-type widening portion between said root and airfoil portions, wherein the widening portions of adjacent blades abut one another to form a closed hoop around the circumference of and spaced from the rotor disk, said hoop and the outer circumference of the rotor disk forming an annulus which is intersected by parts of respective root portions of the blades, wherein said weld means is brazing material, wherein each of said blade root portions have a plurality of lateral faces which face away from the radius extending from the center of the disk through the center portion of the associated blade, said lateral faces being arranged in pairs with each lateral face of a pair arranged at the same radial distance from the center of the disk, each blade including at least two of said pairs of lateral faces spaced radially from one another, the lateral faces of a pair being inclined toward one another and being engageable with respective sidewalls of respective dovetail slot portions of the respective slot accommodating the respective blade, wherein the lateral faces of each pair are arranged at opposite sides of and inclined at a similar angle with respect to a disk radius through the respective blade, and wherein the angles of inclination for the lateral faces of one pair are different than for those of an adjacent radially spaced pair of lateral faces for the same respective blade, whereby the temperature gradient through the root portion of said blade can be accommodated by the respective different angular inclinations.
Claim 3
Dependent Claim
62 words
A rotor wheel according to claim 1, wherein at least some of said dovetail slot portions exhibit bottom walls facing substantially in the radial direction and intersecting a respective sidewall, and wherein depressions are formed between said bottom walls and associated radially facing walls of said root portions when portions of said radially facing walls and bottom walls are in abutting engagement.
Claim 4
Dependent Claim
19 words
A rotor wheel according to claim 2, wherein said sidewalls and lateral faces are brazed one to the other.
Claim 5
Dependent Claim
39 words
A rotor wheel according to claim 1, wherein respective oval cross-sectional shaped recesses, as seen in the direction of the rotor disk axis of rotation, are formed between the innermost radial ends of the respective root portions and slots.
Claim 6
Dependent Claim
39 words
A rotor wheel according to claim 2, wherein respective oval cross-sectional shaped recesses, as seen in the direction of the rotor disk axis of rotation, are formed between the innermost radial ends of the respective root portions and slots.
Claim 7
Dependent Claim
39 words
A rotor wheel according to claim 3, wherein respective oval cross-sectional shaped recesses, as seen in the direction of the rotor disk axis of rotation, are formed between the innermost radial ends of the respective root portions and slots.
Claim 8
Dependent Claim
28 words
A rotor wheel according to claim 1, wherein said annulus is configured such that a cooling medium can be introduced into said annulus for cooling said rotor wheel.
Claim 9
Dependent Claim
28 words
A rotor wheel according to claim 3, wherein said annulus is configured such that a cooling medium can be introduced into said annulus for cooling said rotor wheel.
Claim 10
Dependent Claim
28 words
A rotor wheel according to claim 2, wherein said annulus is configured such that a cooling medium can be introduced into said annulus for cooling said rotor wheel.
Claim 11
Dependent Claim
28 words
A rotor wheel according to claim 6, wherein said annulus is configured such that a cooling medium can be introduced into said annulus for cooling said rotor wheel.
Claim 12
Dependent Claim
18 words
A rotor wheel according to claim 1, wherein the lateral faces slope radially outwardly toward the radius. pg,19
Claim 13
Dependent Claim
356 words
A rotor wheel for flow machines comprising: a rotor disk made of relatively deformable material and including a plurality of radially extending blade accepting dovetail slots, and a plurality of rotor blades fixedly seated in respective ones of said slots by weld means, said blades being made of a highly heat-resistant material different from the material of the rotor disk, each of said blades including an airfoil portion, a root portion and a collar-type widening portion between said root and airfoil portions, wherein the widening portions of adjacent blades abut one another to form a closed hoop around the circumference of and spaced from the rotor disk, said hoop and the outer circumference of the rotor disk forming an annulus which is intersected by parts of respective root portions of the blades, wherein said weld means is brazing material, wherein each of said blade root portions have a plurality of lateral faces which face away from the radius extending from the center of the disk through the center portion of the associated blade, said laTeral faces being arranged in pairs with each lateral face of a pair arranged at the same radial distance from the center of the disk, each blade including at least two of said pairs of lateral faces spaced radially from one another, the lateral faces of a pair being inclined toward one another and being engageable with respective sidewalls of respective dovetail slot portions of the respective slot accommodating the respective blade, wherein at least some of said dovetail slot portions exhibit bottom walls facing substantially in the radial direction and intersecting a respective sidewall, wherein depressions are formed between said bottom walls and associated radially facing walls of said root portions when portions of said radially facing walls and bottom walls are in abutting engagement, and wherein said depressions are so configured that when portions of said radially facing walls and said bottom walls are in abutting engagement, only a narrow land of each bottom wall remains to support each blade such that the blade can be forcecd against the land in such a manner that the land will give way.
Claim 14
Dependent Claim
356 words
A rotor wheel for flow machines comprising: a rotor disk made of relatively deformable material and including a plurality of radially extending blade accepting dovetail slots, and a plurality of rotor blades fixedly seated in respective ones of said slots by weld means, said blades being made of a highly heat-resistant material different from the material of the rotor disk, each of said blades including an airfoil portion, a root portion and a collar-type widening portion between said root and airfoil portions, wherein the widening portions of adjacent blades abut one another to form a closed hoop around the circumference of and spaced from the rotor disk, said hoop and the outer circumference of the rotor disk forming an annulus which is intersected by parts of respective root portions of the blades, wherein said weld means is brazing material, wherein each of said blade root portions have a plurality of lateral faces which face away from the radius extending from the center of the disk through the center portion of the associated blade, said laTeral faces being arranged in pairs with each lateral face of a pair arranged at the same radial distance from the center of the disk, each blade including at least two of said pairs of lateral faces spaced radially from one another, the lateral faces of a pair being inclined toward one another and being engageable with respective sidewalls of respective dovetail slot portions of the respective slot accommodating the respective blade, wherein at least some of said dovetail slot portions exhibit bottom walls facing substantially in the radial direction and intersecting a respective sidewall, wherein depressions are formed between said bottom walls and associated radially facing walls of said root portions when portions of said radially facing walls and bottom walls are in abutting engagement, and wherein said depressions are so configured that when portions of said radially facing walls and said bottom walls are in abutting engagement, only a narrow land of each bottom wall remains to support each blade such that the blade can be forcecd against the land in such a manner that the land will give way.
Claim 15
Dependent Claim
88 words
A rotor wheel according to claim 12, wherein the lateral faces of each pair are arranged at opposite sides of and inclined at a similar angle with respect to a disk radius through the respective blade, and wherein the angles of inclination for the lateral faces of one pair are different than for those of an adjacent radially spaced pair of lateral faces for the same respective blade, whereby the temperature gradient through the root portion of said blade can be accommodated by the respective different angular inclinations.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |