IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0473889
(2009-05-28)
|
등록번호 |
US-8286935
(2012-10-16)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
16 |
초록
▼
An actuator for use with valves in a subsea wellhead assembly. The actuator includes a shaft with an alternating polarity along its length and windings spaced around the shaft that create a magnetic field around the shaft. The shaft is connectable to a valve stem so that flowing current through the
An actuator for use with valves in a subsea wellhead assembly. The actuator includes a shaft with an alternating polarity along its length and windings spaced around the shaft that create a magnetic field around the shaft. The shaft is connectable to a valve stem so that flowing current through the windings creates a magnetic field for linearly moving the shaft and operating the valve. A fail safe mechanism can be included that pushes the shaft back to its original position thereby also moving the valve into its original, or fail safe, position.
대표청구항
▼
1. A valve for a subsea wellhead assembly comprising: a valve body having a fluid flow passage;a gate selectively moveable to open and close the fluid flow passage;an actuator housing secured to the valve body, the actuator housing having an axis, a proximal end cap and a distal end cap with an axia
1. A valve for a subsea wellhead assembly comprising: a valve body having a fluid flow passage;a gate selectively moveable to open and close the fluid flow passage;an actuator housing secured to the valve body, the actuator housing having an axis, a proximal end cap and a distal end cap with an axial bore extending therethrough;an axially movable valve stem extending through the axial bore in the distal end cap, the valve stem having a proximal end within the housing and a distal end exterior of the housing and coupled to the gate for moving the gate;a spring force transfer member carried within the housing, the transfer member having a cylindrical sidewall with a proximal end and a distal end, the distal end of the transfer member being mounted to the valve stem for movement in unison therewith, the cylindricai sidewall being spaced radially inward from the actuator housing, defining an annular space, the transfer member having external flange located within the annular space;a coil spring within the housing, a portion the coil spring being in the annular space surrounding the cylindrical sidewall of the transfer member, the coil spring having a proximal end in cooperative engagement with the flange and a distal end in cooperative engagement with the distal end cap of the housing, so as to exert a force against the transfer member urging the proximal end of the transfer member toward she proximal end cap;magnetized segments stacked together in alternating opposite polarity to define a magnetic segment shaft that is located in the force transfer member and coupled to the proximal end of the valve stem for movement therewith;a linear motor winding array comprising a series of axially spaced apart windings each mounted proximate the magnetized segments, the array being located within the force transfer member surrounding the shaft, the array having a proximal end that is fixed to the housing; whereinenergizing the array with electrical power, causes the shaft to move axially relative to the array, thereby causing the gate to move to the open position and causing the force transfer member to contract the coil spring; and whereinremoving the electrical power from the array causes the coil spring extend to move the gate to the closed position. 2. The valve of claim 1, wherein the winding array further comprises stator rods spaced circumferentially apart from each other around the magnetic segment shaft, each of the stator rods having at least one of the windings. 3. The valve of claim 2, wherein each of the stator rods has a proximal end fixed to the end cap of the housing. 4. The valve of claim 3, wherein each of the stator rods has a distal end abutted by the distal end of the force transfer member when the gate is in the closed position, the distal end of the force transfer member being spaced axially from the distal ends of the stator rods while the gate is in the open position. 5. The valve of claim 1, wherein the flange of the force transfer member is located axially between the distal end and the proximal end of the force transfer member. 6. An actuator for use with a subsea valve having a body, a passage in the body, and a gate that selectively is disposed into the passage, the actuator comprising: a housing;an elongated shaft in the housing with magnetic segments along its length of alternating polarity, the shaft being non-rotatable relative to the housing and axially moveable relative to the housing from a retracted to an extended position;a winding array comprising windings arranged around and spaced radially outward from the shaft within the housing at axially spaced apart locations and connectable to a source of electricity, the winding array being stationarily mounted in the housing for moving the shaft from the retracted to the extended position when supplied with electricity;a stem located within and protruding from the housing for coupling to the gate;a coupling on the shaft that is attachable to the stem for moving the gate in unison with the shaft;a spring force transfer member within the housing and coupled to the valve stem for movement in unison with the shaft, the force transfer member having cylindrical sidewall that surrounds the winding array, the cylindrical sidewall being spaced radially inward from a sidewall of the housing, defining an annular space;an external flange on the sidewall of force transfer member within the annular space; anda coil spr1ng having one end fixed to the housing and another end applying an axial force to the flange to urge the shaft to the retracted position. 7. The actuator of claim 6, wherein the winding array comprises elongated stator rods circumscribing the shaft, and each of the stator rods having at least one of the windings. 8. The actuator of claim 6, wherein the stator rods are parallel to the shaft and circumferentially spaced apart from each other. 9. The actuator of claim 8, wherein the gate is held in the open position solely by the electricity being supplied to the winding array. 10. The actuator of claim 6, wherein the force transfer member secures to the valve stem at the coupling. 11. A method of controlling flow through a wellhead assembly comprising: providing a shaft assembly that has axially adjacent regions of alternating magnetic polarity and mounting the shaft assembly within an actuator housing for axial movement between contracted and extended positions relative to the housing;mounting a linear motor winding array stationarily in the housing around the shaft assembly;mounting a spring force transfer member within the housing for movement with the shaft assembly, the spring force member surrounding the winding array and having an external flange in an annular space between the transfer member and the housing;mounting a coil spring in the housing with one end engaging the flange and an opposite end engaging the housing;flowing an alternating electrical current through the winding array to move the shaft assembly from the contracted to the extended position and the gate linearly from a first position to a second position, the movement of the shaft assembly to the extended position contracting the coil spring; andmoving the gate from the second position back to the first position by removing the alternating electrical current, which causes the coil spring to extend and move the shaft assembly back to the contracted position. 12. The method of claim 11, wherein the gate is held in the second position by maintaining the electrical current in the winding array.
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