Device for controlling variable-pitch members in a turbomachine

Patent metadata

Field	Value
Publication number	US-10837308-B2
Application number	US-201716302862-A
Country	US
Kind code	B2
Filing date	May 23, 2017
Priority date	May 25, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A device for controlling variable-pitch turbomachine members such as stator vanes, wherein the movement of a control mechanism is imparted to a ring that rotates the levers for pivoting the vanes about a stator, and takes place with a possible change in the length of the bottle screw connecting the ring to the control mechanism, thereby allowing the blade pitch angle law to be changed according to the extension of the control device. A greater freedom of adjustment is thus obtained. The device can be useful when a single control mechanism is used for multiple rings arranged side by side, making it possible to have different control laws for the rings.

First claim

The invention claimed is:

1. A control device for controlling variable-pitch elements in a turbomachine, comprising a common actuator mechanism and mechanical transmissions connecting the actuator mechanism to the variable-pitch elements, the mechanical transmissions each comprising a stretching screw, where at least one of the stretching screws is a variable-length member, controlled by a length adjustment device,
wherein the length adjustment device contains a control law for controlling the length of said member based on positions of the actuator mechanism, and
wherein the control law imposes length variations of said member only at some positions of the actuator mechanism.

2. The control device according to claim 1 , wherein the variable-pitch elements are stages of stator vanes.

3. The control device according to claim 1 , wherein the variable-length member is an electro-jack.

4. The control device according to claim 1 , wherein the length adjustment device is associated with a control system which imposes length variations of said member based on operational parameters of the turbomachine.

5. The control device according to claim 4 , wherein the operational parameters comprise either a thrust, or a rotational speed of the turbomachine.

6. The control device according to claim 1 , comprising a plurality of said variable-length members, wherein the length adjustment device imposes different lengths to jacks.

7. A control device for controlling variable-pitch elements in a turbomachine, comprising a common actuator mechanism and mechanical transmissions connecting the actuator mechanism to the variable-pitch elements, the mechanical transmissions each comprising a stretching screw, where at least one of the stretching screws is a variable-length member, controlled by a length adjustment device,
wherein the length adjustment device contains a control law for controlling the length of said member based on positions of the actuator mechanism,
wherein the control law imposes different lengths of said member, for identical positions of the actuator mechanism, along a direction of motion of the actuator mechanism, and
wherein said different lengths have a constant difference value.

8. The control device according to claim 7 , wherein said different lengths are both uniform over an entire stroke of the actuator mechanism.

Assignees

• Safran Aircraft Engines

Inventors

• Bazot Olivier
• Edynak Jeremy Philippe Pierre

Classifications

• F01D17/162 Primary

  for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line (F01D17/167 takes precedence) · CPC title

• F05D2270/62

  Electrical actuators · CPC title

• F05D2220/30

  in turbines · CPC title

• F05D2240/12

  Fluid guiding means, e.g. vanes · CPC title

• F01D17/141

  by means of shiftable members or valves obturating part of the flow path · CPC title