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A device is provided for pivoting at least one pivotable element in a gas turbine engine between a first and a second position in order to influence a gas flow in an annular gas duct in at least one of the positions. The device includes a moveable annular member which is arranged externally around t

A device is provided for pivoting at least one pivotable element in a gas turbine engine between a first and a second position in order to influence a gas flow in an annular gas duct in at least one of the positions. The device includes a moveable annular member which is arranged externally around the gas duct and is connected to the pivotable element in order to effect the pivoting of the pivotable element. The annular member is more specifically arranged to be displaced in a substantially axial direction and arranged to pivot the pivotable element when it is displaced axially.

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1. A device for pivoting at least one pivotable element in a gas turbine engine between a first and a second position in order to influence a gas flow in an annular gas duct in at least one of the positions, the device comprising a moveable annular member which is arranged externally around the gas

1. A device for pivoting at least one pivotable element in a gas turbine engine between a first and a second position in order to influence a gas flow in an annular gas duct in at least one of the positions, the device comprising a moveable annular member which is arranged externally around the gas duct and is connected to the pivotable element in order to effect the pivoting of the pivotable element, wherein the annular member is arranged to be displaced in a substantially axial direction and arranged to pivot the pivotable element when it is displaced axially,a linkage mechanism, the linkage mechanism connecting the annular member and a fixed part, the linkage mechanism supporting the annular member in relation to the fixed part and being arranged to control axial movement of the annular member, wherein the linkage mechanism comprises at least two parallel stabilizer bars, a first stabilizer bar being pivotably connected to the annular member at two separate positions in a circumferential direction of the device, and a second stabilizer bar being pivotably connected to the fixed part at two separate positions in the circumferential direction, andan actuator, which is connected to the annular member for displacement the annular member between a first and a second position in the axial direction, which positions correspond to the first and second position of the pivotable element, the actuator and the linkage mechanism being separate structures. 2. The device as claimed in claim 1, wherein the annular member is arranged radially outside a fixed wall which defines the annular gas duct and is axially displaceable relative to the wall. 3. The device as claimed in claim 1, wherein multiple pivotable elements are spaced at intervals from one another in a circumferential direction. 4. The device as claimed in claim 1, wherein the device comprises at least one motion-transmitting member, which mechanically connects the axially displaceable annular member and the pivotable element. 5. The device as claimed in claim 4, wherein the motion-transmitting member extends substantially in the axial direction of the gas turbine. 6. The device as claimed in claim 4, wherein the motion-transmitting member is elongate and substantially rigid and at one end is connected to the axially displaceable annular member and at the other end is connected to the pivotable element via pivot joints. 7. A device for pivoting at least one pivotable element in a gas turbine engine between a first and a second position in order to influence a gas flow in an annular gas duct in at least one of the positions, the device comprising a moveable annular member which is arranged externally around the gas duct and is connected to the pivotable element in order to effect the pivoting of the pivotable element, wherein the annular member is arranged to be displaced in a substantially axial direction and arranged to pivot the pivotable element when it is displaced axially, anda linkage mechanism, which supports the axially displaceable annular member in relation to a fixed part and is arranged to control the axial movement of the annular member, wherein the linkage mechanism comprises at least two parallel stabilizer bars, a first stabilizer bar being pivotably connected to the annular member at two separate positions in a circumferential direction of the device, and a second stabilizer bar being pivotably connected to the fixed part at two separate positions in the circumferential direction. 8. The device as claimed in claim 7, wherein the stabilizer bars are arranged in axial opposition to one another and are pivotably connected to one another. 9. The device as claimed in claim 7, wherein each stabilizer bar comprises an elongate rod, which extends at least partially in the circumferential direction, the elongate rods of two opposing stabilizer bars being parallel to one another and connected to one another via a pivot joint. 10. The device as claimed in claim 7 wherein each linkage mechanism comprises two sets of a first leg and a second leg, which connect the stabilizer bar to the fixed part and the annular member respectively in the separate angular positions. 11. The device as claimed in claim 7, wherein the linkage mechanism comprises multiple link units in the circumferential direction of the vas duct, which connect the annular member to the fixed part, each link unit comprising a pair of the stabilizer bars. 12. The device as claimed in claim 1, wherein the pivotable element is arranged to be pivoted about a pivot axis, which extends at right angles to the axial direction of the gas duct. 13. The device as claimed in claim 1, wherein the pivotable element is arranged to be pivoted about a pivot axis, which extends tangentially to the circumferential direction of the vas duct. 14. The device as claimed in claim 1, wherein the pivotable element forms a hatch, which is arranged to open and close an opening in as wall, which defines the gas duct for the purpose of bleeding gas. 15. The device as claimed in claim 14, wherein multiple hatches are spaced at intervals from one another in a circumferential direction, each door being positioned to open and close an opening in the wall. 16. The device as claimed in claim 1, wherein the pivotable element is arranged to be pivoted about a pivot axis, which extends substantially radially in relation to the gas duct. 17. The device as claimed in claim 1, wherein the pivotable element forms a guide vane which is arranged in the gas duct, the guide vane being arranged to be positioned in at least two separate angular positions. 18. The device as claimed in claim 17, wherein multiple guide vanes are spaced at intervals from one another in a circumferential direction. 19. A gas turbine comprising the device as claimed in claim 1. 20. An aircraft engine comprising the device as claimed in claim 1. 21. The device as claimed in claim 1, wherein the linkage mechanism comprises a first leg connected to the annular member and a second leg connected to the fixed part, the first and second legs being pivotably connected at a pivot joint having an axis extending at a right angle to an axial direction of the gas duct so that pivoting of the first and second legs about the pivot axis produces only axial movement of the annular member relative to the fixed part.