Patent US3614253A successfully refreshed from Google Patents.
US3614253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine stall anticipation and reaction device
Assignee: Individual
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Filing: 1969-05-29
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Granted: 1971-10-19
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Expires: 1989-05-29
Abstract
Abstract In a compressor operating near stall and utilizing the mechanism of variable pitch stator blades to prevent stall, a floating stator blade is used to sense an imminent stall condition. The blade pivots like a weather vane in the airstream flow through the axial flow compressor. The attack angle differential between the variable pitch stator blades and the floating stator blade is sensed and utilized by electrical or fluid pressure means to change the attack angle of the variable pitch stator blades so as to prevent stall.
Inventors
- 👤 Robert M Gaertner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:50
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0246
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
An apparatus for anticipating and preventing stall in axial flow jet engine compressors which have one or more stages and utilize variable stator blades to control operating characteristics of the compressor having a compressor housing adapted for rotatably mounting said variable stator blades thereon comprising at least one floating stator blade per variable stator blade stage rotatably mounted among said variable stator blades so as to allow said floating stator blade to align itself with airstream flow in said compressor; a follower means responsive to rotational movement of said floating stator blade; a damping means restraining said floating stator blade from freely rotating in response to minute direction changes in said airstream flow; a control means responsive to actuation by said follower means; and adjustment means responsive to said control means to actuate said variable stator blades to follow the movement of said floating stator blade whereby a complete stall condition is averted.
Claim 2
Independent Claim
153 words
An apparatus for anticipating and preventing stall in axial flow jet engine compressors which have one or more stages and utilize variable stator blades to control operating characteristics of the compressor having a compressor housing adapted for rotatably mounting said variable stator blades thereon comprising at least one floating stator blade per variable stator blade stage rotatably mounted among said variable stator blades so as to allow said floating stator blade to align itself with airstream flow in said compressor; a follower means responsive to rotational movement of said floating stator blade; a damping means restraining said floating stator blade from freely rotating in response to minute direction changes in said airstream flow; a control means responsive to actuation by said follower means; and adjustment means responsive to said control means to actuate said variable stator blades to follow the movement of said floating stator blade whereby a complete stall condition is averted.
Claim 3
Dependent Claim
52 words
The stall anticipating and preventing apparatus as recited in claim 1 wherein said follower means comprises a shaft rigidly attached to said floating stator blade so as to rotate with said floating blade; and rotary motion to linear motion conversion means responsive to rotation of said shaft to actuate said control means.
Claim 4
Dependent Claim
103 words
The stall anticipating and preventing apparatus as recited in claim 2 wherein said control means comprises a fluid flow directing means responsive to a force exerted by said motion conversion means to direct high-pressure fluid flow; high-pressure fluid conductors for transmitting said directed fluid flow; a fluid pressure activated piston responsive to fluid flow transmitted by said conductors to actuate said adjustment means; and feedback means responsive to movement of said piston to apply a force opposite in direction to the force applied by said motion conversion means being of sufficient strength to reposition said fluid flow directing means to a null position.
Claim 5
Dependent Claim
32 words
The stall anticipating and preventing apparatus as recited in claim 1 further comprising a fuel feed means responsive to said control means for decreasing volume of fuel flow to the jet engine.
Claim 6
Independent Claim
167 words
An apparatus for anticipating and preventing stall in axial flow jet engine compressors which have one or more stages and utilize variable stator blades to control operating characteristics of the compressor having a compressor housing adapted for rotatably mounting said variable stator blades thereon comprising at least one floating stator blade per variable stator blade stage rotatably mounted among said variable stator blades so as to allow said floating stator blade to align itself with airstream flow in said compressor; a follower means responsive to rotational movement of said floating stator blade; said follower means comprising a shaft rigidly attached to said floating stator blade so as to rotate with said floating blade, and a resilient means rigidly attached and deformably responsive to rotation of said shaft; a control means responsive to actuation by said follower means; and adjustment means responsive to said control means to actuate said variable stator blades to follow the movement of said floating stator blade whereby a complete stall condition is averted.
Claim 7
Independent Claim
167 words
An apparatus for anticipating and preventing stall in axial flow jet engine compressors which have one or more stages and utilize variable stator blades to control operating characteristics of the compressor having a compressor housing adapted for rotatably mounting said variable stator blades thereon comprising at least one floating stator blade per variable stator blade stage rotatably mounted among said variable stator blades so as to allow said floating stator blade to align itself with airstream flow in said compressor; a follower means responsive to rotational movement of said floating stator blade; said follower means comprising a shaft rigidly attached to said floating stator blade so as to rotate with said floating blade, and a resilient means rigidly attached and deformably responsive to rotation of said shaft; a control means responsive to actuation by said follower means; and adjustment means responsive to said control means to actuate said variable stator blades to follow the movement of said floating stator blade whereby a complete stall condition is averted.
Claim 8
Dependent Claim
44 words
The stall anticipating and preventing apparatus as recited in claim 5 wherein said control means comprises a transducer responsive to deformation of said resilient means; a transducer amplifier; and variable stator actuating means responsive to said transducer amplifier to rotatably actuate said adjustment means.
Claim 9
Dependent Claim
69 words
The stall anticipating and preventing apparatus as recited in claim 6 wherein said adjustment means comprises a rotating shaft responsive to said variable stator actuating means; rotatable shafts rigidly attached to said variable stator blades so as to rotate with said variable stator blades; and bevel gear combinations transmitting rotary motion from said rotating shaft to the rotatable shafts of said variable stator blades and said floating stator blade.
Claim 10
Dependent Claim
32 words
The stall anticipating and preventing apparatus as recited in claim 5 further comprising a fuel feed means responsive to said control means for decreasing volume of fuel flow to the jet engine.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |