An actuator for displacing a control device including a valve, a gate valve or the like, in particular for use in oil or gas production systems, said actuator comprising an electric drive and a thread drive displaceable by means of said electric drive. The thread drive comprises at least a threaded
An actuator for displacing a control device including a valve, a gate valve or the like, in particular for use in oil or gas production systems, said actuator comprising an electric drive and a thread drive displaceable by means of said electric drive. The thread drive comprises at least a threaded spindle and a screw nut. The threaded spindle is displaceable in a substantially axial direction between an advanced position and a retracted position so as to displace the control device. In order to improve an actuator of this kind in such a way that advantages of an already known actuator will be maintained on the basis of a smaller number of components and a more compact structural design and a reduction of the manufacturing costs can simultaneously be accomplished, the electric drive comprises at least one torque motor with a hollow shaft, said hollow shaft being connected to the driven side of a safety clutch unit such that it is secured against rotation relative thereto. This safety clutch unit is, on the driving side thereof, connected in a motion-transmitting manner to the screw nut which is supported such that it is rotatable and axially non-displaceable. In this way, it is additionally achieved that the actuator in question can also be used for units that are already in use.
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1. An actuator (1) for displacing a control device (2) for use in oil or gas production systems, comprising: an electric drive (4) comprising a torque motor (10, 11);a hollow shaft (12) driven by the electric drive (4);a safety clutch unit (14) comprising a driven side (13) and a driving side (15),
1. An actuator (1) for displacing a control device (2) for use in oil or gas production systems, comprising: an electric drive (4) comprising a torque motor (10, 11);a hollow shaft (12) driven by the electric drive (4);a safety clutch unit (14) comprising a driven side (13) and a driving side (15), the driven side (13) of the safety clutch unit (14) being connected to the hollow shaft (12) at an interior driving end portion of the hollow shaft (12);a thread drive (5) displaceable by the electric drive (4) and comprising: a threaded spindle (6) displaceable in a substantially axial direction between an advanced position (8) and a retracted position (9) so as to displace the control device (2); anda screw nut (7) supported such that it is rotatable and axially non-displaceable, the screw nut (7) being connected for rotation to and by the driving side (15) of the safety clutch unit (14). 2. The actuator of claim 1, wherein torque motor (10, 11) further comprises a rotor (16) secured on an outer side (17) of the hollow shaft (12). 3. The actuator of claim 2, wherein an outer side (17) of the hollow shaft comprises a radially outward projecting abutment projection (18), the rotor (16) being held between the abutment projection (18) and a counter element (19). 4. The actuator of claim 1, further comprising at least two torque motors (10, 11) arranged on the hollow shaft (12). 5. The actuator of claim 1, further comprising a connection sleeve (20) coupling the driving side (15) of the safety clutch unit (14) and the screw nut (7). 6. The actuator of claim 5, further comprising a driving journal (21) projecting from the connection sleeve (20) in a substantially axial direction, and wherein the safety clutch unit (14) is secured to the driving journal (21) on the driving side (15). 7. The actuator of claim 6, wherein the safety clutch unit (14) is secured to the driving journal (21) by a clamping device (22) so as to prevent rotation relative thereto. 8. The actuator of claim 6, wherein the driving journal (21) comprises an axial hole (23). 9. The actuator of claim 1, further comprising a first housing section (24) accommodating the electric drive (4) and a second housing section (25) accommodating the thread drive (5), the first and second housing sections being detachable from one another. 10. The actuator of claim 5, further comprising: a first housing section (24) accommodating the electric drive (4) and a second housing section (25) accommodating the thread drive (5), the first and second housing sections being detachable from one another; anda bearing unit (26) arranged between an inner side (27) of the second housing section (25) and an outer side (28) of the connection sleeve (20) so as to rotatably support the connection sleeve (20). 11. The actuator of claim 1, wherein the threaded spindle (6) is supported in an axially displaceable but non-rotatable manner. 12. The actuator of claim 11, further comprising a guide sleeve (29) comprising a guide slot (31) engaged by a guide pin (32) projecting radially outwards relative to the threaded spindle (6). 13. The actuator of claim 11, further comprising: two housing sections (24, 25) detachable from one another, a first housing section (24) accommodating the electric drive (4) and a second housing section (25) accommodating the thread drive (5) and comprising an end opening (33) opposite to the first housing section (24); anda guide sleeve (29) comprising: an opening insert (34) which covers the second housing section end opening (33); andan opening (35) for passing the threaded spindle (6) therethrough. 14. The actuator of claim 1, wherein the threaded spindle (6) is connected to a piston rod (38) at an end (37) facing the control device (2). 15. The actuator of claim 1, further comprising a connection element (39) releasably secured to the threaded spindle (6), the guide pin (32) projecting radially outwards from the connection element (39). 16. The actuator of claim 1, further comprising a motion sensor (40) comprising a sensor element (42) configured to measure the threaded spindle (6). 17. The actuator of claim 1, further comprising a plug device (43) configured to transmit at least one of control signals, datat, and a supply voltage. 18. The actuator of claim 9, wherein the second housing section (25) is connectable to a connection housing (44), which is adapted to be flange-mounted. 19. The actuator of claim 18, further comprising a spring sleeve (46) arranged between the connection housing (44) and the second housing section (25), the spring sleeve (46) configured to accommodate a return spring (47). 20. The actuator of claim 19, wherein the return spring (47) is operative between the spring sleeve (46) and the threaded spindle (6). 21. The actuator of claim 1, wherein the hollow shaft (12) is rotatably supported. 22. The actuator of claim 21, wherein the hollow shaft (12) comprises an end portion (49) connected to the driven side (13) of the safety clutch unit (14) so as to prevent rotation relative thereto.
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