US3642379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary gas-handling machine and rotor therefor free of vibration waves in operation
Assignee: Individual
•
Filing: 1969-06-27
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Granted: 1972-02-15
•
Expires: 1989-06-27
Abstract
Abstract A rotary gas-handling machine and rotor therefor in which the number of puffs of gas affecting the rotor so as to tend to excite vibrations therein on each revolution will be such that for the designed speed of operation of the rotor the resulting frequency of excitation puffs will be different from each of the resonant frequencies of the rotor, such as the resonant frequency for ''''saddle'''' vibration, blade vibration, rotational and outer edge vibration of the shroud, etc. The excitation frequency is also made to differ from one-half of each of the resonant frequencies. In the case of such a machine in the form of a turbine the number of excitation puffs per revolution is determined by the number of circumferentially spaced nozzles carried by the housing to direct the gas against the rotor, while in the case of a compressor rotor the number of excitation puffs per revolution is determined by the number of blades. The blades and the shroud are preferably made thicker adjacent their inner extremities both to deter vibration by inherent stiffness of such thicker members and to change their natural frequencies by the mass of the thickened members. The same sort of structure makes the shroud more resistant to vibration by stiffening an important component of the ''''spring'''' of the resonant mode while strengthening it against shear. Another expedient is to cause the blades to protrude from the wheel outwardly past the plane of the eye of the shroud and be joined to the hub out beyond such plane so as to provide bracing for both the shroud and the disk of the rotor against axial vibration.
Inventors
- 👤 Judson S Swearingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:12
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/26; F01D1/00; F01D1/02; F01D1/06; F01D1/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
In a rotary gas-handling machine designed for rotation at a predetermined fixed speed and in which gas is converted from one pressure to another and which comprises a housing, a rotor rotatably mounted therein and having generally radially and axially extending blades each confined between and joined to a hub and a disk along one axially directed edge, said disk being continuous with and projecting generally radially from said hub, and an annular shroud opposed to the disk along the other axially directed edge forming generally radially directed gas passageways between the said blades, hub, disk and shroud, and having predetermined resonant frequencies for known types of rotation vibration, the improvement which comprises said housing and rotor combination including means for rotating said rotor at said predetermined speed and means for producing a predetermined number of excitation puffs of gas between exterior and interior of said passages for each revolution of the rotor so that said number of excitation puffs multiplied by said speed of rotation will produce an excitation frequency of puffs which differs from each of said resonant frequencies.
Claim 2
Dependent Claim
181 words
In a rotary gas-handling machine designed for rotation at a predetermined fixed speed and in which gas is converted from one pressure to another and which comprises a housing, a rotor rotatably mounted therein and having generally radially and axially extending blades each confined between and joined to a hub and a disk along one axially directed edge, said disk being continuous with and projecting generally radially from said hub, and an annular shroud opposed to the disk along the other axially directed edge forming generally radially directed gas passageways between the said blades, hub, disk and shroud, and having predetermined resonant frequencies for known types of rotation vibration, the improvement which comprises said housing and rotor combination including means for rotating said rotor at said predetermined speed and means for producing a predetermined number of excitation puffs of gas between exterior and interior of said passages for each revolution of the rotor so that said number of excitation puffs multiplied by said speed of rotation will produce an excitation frequency of puffs which differs from each of said resonant frequencies.
Claim 3
Dependent Claim
63 words
A rotary gas-handling machine in accordance with claim 1 in which the machine is a turbine and the means for producing excitation puffs for each revolution comprises a plurality of circumferentially spaced nozzles carried by the housing, disposed about and adjacent the outer ends of said passageways and adapted to direct gas tangentially and slightly radially into said outer ends of the passageways.
Claim 4
Dependent Claim
32 words
A machine as set forth in claim 1 in which the machine is a compressor and the means for producing excitation puffs for each revolution comprises the ends of the several blades.
Claim 5
Dependent Claim
32 words
A machine as set forth in claim 1 in which the machine is a turbine and the means for producing excitation puffs for each revolution comprises the ends of the several blades.
Claim 6
Dependent Claim
76 words
A machine as set forth in claim 1 in which an inner periphery of said annular shroud is axially and radially spaced from that end of said hub which is more remote from said disk, and in which said blades project axially through the annular space between said huB and said inner periphery of said shroud and are continuously joined to said hub to a position beyond said inner periphery of said shroud from said disk.
Claim 7
Dependent Claim
25 words
A machine as set forth in claim 1 in which said blades are thicker near said disk and said hub than at their opposite portions.
Claim 8
Dependent Claim
25 words
A machine as set forth in claim 1 in which said shroud is of greater bending strength adjacent its inner than adjacent its outer periphery.
Claim 9
Dependent Claim
164 words
In a rotary gas-handling machine designed for rotation at a predetermined fixed speed, and in which gas is converted from one pressure to another and which comprises a housing, a rotor rotatably mounted therein and having generally radially and axially extending blades each joined to a hub and a disk along one axially directed edge, said disk being continuous with and projecting generally radially from said hub, and forming generally radially directed gas passageways between the said blades, hub and disk, and having predetermined resonant frequencies for known types of rotation vibration, the improvement which comprises said housing and rotor combination including means for rotating said rotor at said predetermined speed and means for producing a predetermined number of excitation puffs of gas between exterior and interior of said passages for each revolution of the rotor so that said number of excitation puffs multiplied by said speed of rotation will produce an excitation frequency of puffs which differs from each of said resonant frequencies.
Claim 10
Dependent Claim
164 words
In a rotary gas-handling machine designed for rotation at a predetermined fixed speed, and in which gas is converted from one pressure to another and which comprises a housing, a rotor rotatably mounted therein and having generally radially and axially extending blades each joined to a hub and a disk along one axially directed edge, said disk being continuous with and projecting generally radially from said hub, and forming generally radially directed gas passageways between the said blades, hub and disk, and having predetermined resonant frequencies for known types of rotation vibration, the improvement which comprises said housing and rotor combination including means for rotating said rotor at said predetermined speed and means for producing a predetermined number of excitation puffs of gas between exterior and interior of said passages for each revolution of the rotor so that said number of excitation puffs multiplied by said speed of rotation will produce an excitation frequency of puffs which differs from each of said resonant frequencies.
Claim 11
Dependent Claim
40 words
A rotary gas-handling machine in accordance with claim 8 in which said number of excitation puffs multiplied by said rate of rotation will produce an excitation frequency of puffs which differs from one-half of each of said resonant frequencies also.
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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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |