Linear actuator for a bleed valve

Patent · Tue Jun 08 04:00:00 EDT 1993

OSTI ID:6349668

Moore, Jr, R G

In a control system for a turbine engine having a variable geometry air compressor, the improvement is described in the actuator assembly comprising: a housing having a bore therein with an inlet port connected to receive the first fluid pressure and an outlet port connected to the surrounding environment; a piston located in the housing for separating the bore into a first chamber and a second chamber, the first chamber being connected to the inlet port and the second chamber being connected to the outlet port; a restriction located in the outlet port to control the communication of any fluid pressure in the second chamber to the environment; a sleeve located in the housing, the sleeve having a radial slot therein; a shaft having a first end journaled in the sleeve and a second end that extends through the housing, the shaft having a blind bore therein connected to receive compressor discharge fluid pressure, the shaft having an opening therein from the blind bore aligned in a plane with the radial slot in the sleeve, the shaft being connected to the piston and rotated thereby as a function of linear movement of the piston by the second pressure differential to position the opening with respect to the radial slot and correspondingly create a variable opening from the blind bore to the second chamber, the second end being connected by the linkage to the variable geometry air compressor; and resilient means for urging the piston toward the first chamber in opposition to the second pressure differential, the second fluid pressure being developed by compressor discharge fluid pressure flowing from the blind bore through the variable opening into the second chamber and fluid pressure in the second chamber flowing through the restriction in the outlet port to the surrounding environment, the second pressure differential moving the piston and shaft and correspondingly the linkage to linearly change the geometry of the air compressor.

• Assignee: Allied-Signal Inc., Morristown, NJ (United States)
• Patent Number(s): US 5216877; A
• Application Number: PPN: US 7-830047
• OSTI ID: 6349668
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
COMPRESSORS
CONTROL SYSTEMS
ENGINES
GAS TURBINE ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL SHAFTS
PISTONS
PRESSURE DEPENDENCE
SHAFTS