WO2004104462A1 - Actionneur electromagnetique pivotant, actionneur integre et soupape de regulation de flux de fluide - Google Patents

Actionneur electromagnetique pivotant, actionneur integre et soupape de regulation de flux de fluide Download PDF

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Publication number
WO2004104462A1
WO2004104462A1 PCT/GB2004/002080 GB2004002080W WO2004104462A1 WO 2004104462 A1 WO2004104462 A1 WO 2004104462A1 GB 2004002080 W GB2004002080 W GB 2004002080W WO 2004104462 A1 WO2004104462 A1 WO 2004104462A1
Authority
WO
WIPO (PCT)
Prior art keywords
armature
poles
actuator
stator
valve
Prior art date
Application number
PCT/GB2004/002080
Other languages
English (en)
Inventor
Wygnanski Wladyslaw
Original Assignee
Camcon Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0311879A external-priority patent/GB2390414B/en
Priority claimed from GB0320397A external-priority patent/GB0320397D0/en
Application filed by Camcon Ltd filed Critical Camcon Ltd
Publication of WO2004104462A1 publication Critical patent/WO2004104462A1/fr
Priority to US11/034,580 priority Critical patent/US7252114B2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
    • F16K31/082—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet using a electromagnet and a permanent magnet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0682—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid with an articulated or pivot armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2209—Polarised relays with rectilinearly movable armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets

Definitions

  • This invention concerns electromagnetic actuators and in particular a design of actuator which can be integrated into a fluid flow control valve.
  • Figs 10 and 11 of which show such a device in which an armature 3 can rock between two points under the influence of electric current produced changes in the flux linking the armature and four poles 6, 6' 7 and 7'.
  • springs are shown permanently linking one end of the armature two of the poles, to centre the armature between the poles. Examples of the centring springs are shown in Figs 12 and 13.
  • an electromagnetic actuator which includes a stator which defines two pairs of poles and an elongate magnetisable armature which is pivotable in a see-saw manner between two home positions in each of which it is in contact with two of the four poles, and in doing so passes through a mid position equidistant from the poles, wherein a closed low reluctance path for magnetic flux is created by the stator and the armature when the latter is in contact with the stator poles in each home position, and the low reluctance path includes at least one permanent magnet the flux from which creates a force of attraction between the armature and the home position poles with which it is in contact, the permanent magnet flux being sufficient to maintain the armature in either home position, and an electromagnet is provided having a winding through which electric current can flow, which when energised by an appropriate pulse of current will alter the magnetic flux for the duration of the pulse so as to cause the armature to be repelled from the two pole
  • each current pulse will shift the armature between its two home positions.
  • the or each permanent magnet comprises part of the low reluctance path through the stator, and the electromagnet influences the magnetisation of the armature
  • the electromagnet may be positioned relative to the armature so that when current flows in one direction magnetic flux is produced which reverses the magnetic polarity of the armature causing it to be repelled from the two poles it is in contact with, and attracted towards the other two poles.
  • the or each permanent magnet comprises part of the armature so as to permanently form a North pole at one end and a South pole at the other end thereof, and the electromagnet is positioned so as to create magnetic flux in the low reluctance path external of the armature in the stator, such that when a pulse of current flows in one direction the magnetic flux linking the armature in its present position is reinforced but if in the other direction the magnetic polarity of the two stator poles with which the armature is in contact is reversed, causing the armature to be repelled therefrom and to be attracted towards the other two stator poles.
  • two permanent magnets are incorporated into the armature symmetrically about its central region.
  • the magnetised armature may be located within the stator and the latter typically defines the four poles, and a balanced magnetic system is obtained by providing two electromagnet windings one at each end of the stator and the armature is located centrally between the two windings.
  • stator is a symmetrical structure about the armature containing region thereof.
  • the closed low reluctance magnetic path provided by the stator around the magnetised armature largely contains the permanent magnet flux therewithin, so that there is little tendency for magnetic flux to leak from the stator.
  • a central region of the armature includes a non-magnetisable portion having a curved surface which is received in and makes rolling contact with a complementary curved surface in a non-magnetisable member mounted within the stator.
  • spring means acts between the central region of the armature and the stator to keep the two curved surfaces in rolling contact.
  • the spring means acts to create a position of unstable equilibrium when the armature is midway between the magnetic poles.
  • the spring means comprises helical springs in tension between lateral protrusions on the armature and lateral protrusions on the stator.
  • the spring means comprise two spring steel rings engaged between lateral protrusions from the armature and the stator.
  • spring means is provided on opposite sides of the armature, so as not to laterally tilt the armature relative to the stator.
  • the resilient energy storage means is preferably selected so that it will exert an increasing force on the armature as the latter moves towards a pole, which will decelerate the armature as it approaches the pole but is insufficient to overcome the increasing force of magnetic attraction between the armature and the pole as the former closes on the latter, thereby to reduce the impact force as the armature contacts the pole and to store energy from the deceleration of the armature which energy is available to accelerate the armature away from the pole if the magnetic flux linking the armature and pole is reduced.
  • poles comprise stops which limit the rocking movement of the armature.
  • the permanent magnet, the pole pieces and the or each electromagnet are contained within a housing.
  • the housing is formed from magnetisable material and comprises part of the low reluctance magnetic flux path.
  • the housing comprises at least in part the stator.
  • Movement of the armature can be transmitted externally of the housing by means of push rod means.
  • the resilient energy storage means acts between the armature and the housing, or a member attached to the housing, In a preferred arrangement the resilient energy storage means acts between the armature and at least some of the poles.
  • the resilient energy storage means is carried by and extends from the armature, or is attached to and extends from adjacent poles.
  • the resilient energy storage means preferably comprises a compressible spring
  • push rod means it preferably extends through a passage in at least one of the poles for conveying armature movement externally of the device.
  • the push rod means is preferably constructed from non-magnetic material.
  • the push rod extends through the spring and is linked thereto to be urged by the spring towards the armature, and stop means is provided which in use prevents the push rod from following the armature all the way to its mid position between the poles, so that the armature is free of spring influence over part of its travel between poles.
  • the invention also lies in a fluid flow control valve incorporating an actuator as aforesaid.
  • the invention also lies in a combination of fluid flow control valve and actuator comprising :-
  • a housing defining a chamber to which or from which fluid can flow via an opening in the housing wall and containing a magnetisable stator
  • an armature adapted to move in a see-saw manner between four poles carried by the stator which define two bistable home positions of the armature, in one of which it makes contact with two of the poles, and in the other of which it makes contact with the other two poles, the armature and poles being located within the housing and comprising an actuator,
  • two springs may be mounted between the armature and either the housing or the stator, one on each side of the armature.
  • the spring force acts so as to assist the rolling movement of the armature as soon as it moves out of its mid position towards one or the other of its two home positions.
  • a second opening is provided in the complementary curved surface which is covered when the armature occupies the said other home position and is uncovered when the armature occupies its said one home position.
  • the armature is moveable from one home position to the other by altering the magnetic flux linking the armature and the poles so as to cause the armature to be repelled from the two poles it is in contact with and to be attracted towards the other two poles.
  • the magnetic flux may be altered by moving a magnet relative to the device, and such a magnet may be a permanent magnet or an energised electromagnet.
  • each permanent magnet is incorporated into the armature and a stationary electromagnet is provided which when energised by a current flowing in one direction alters the magnetic polarity of the poles to effect the changeover of the armature from one home position to the other.
  • the or each permanent magnet is incorporated into the flux path between the poles of the stator, and the electromagnet is arranged so as to influence the magnetic polarity of the armature, so that when a current flows in one direction in the winding of the electromagnet, the armature polarity becomes opposite to that which is created by the permanent magnet flux, thereby to cause the armature to be repelled by the poles it is in contact with, and be attracted towards the other two poles.
  • Energy storing springs may be located in a pair of the poles at one end of the armature, each of which is engaged and compressed by the armature as it moves towards and into contact with the pole, so that whichever home position the armature occupies one or the other of the two springs is compressed, thereby converting some of the kinetic energy of the armature into potential energy, which is stored in the spring until the armature is released from that home position, when the potential energy is available to accelerate the armature away from that home position towards the other home position.
  • a ridge is provided on the curved surface of the armature and the complementary curved surface includes a groove in which the ridge is received
  • a ridge may be formed transversely of the said complementary curved surface, and the central region of the curved surface of the armature includes a transverse groove in which the ridge is received.
  • the engagement between ridge and groove is similar to meshing gear teeth, but preferably the fit is sloppy so as not to interfere with the rolling motion between armature and stator.
  • the curved armature surface is part spherical (i.e. part of a sphere) and the complementary curved surface is part cylindrical (i.e. part of a cylinder).
  • the opening in the housing wall may comprise a fluid inlet to the chamber, in which event the or each opening in the complementary curved surface may comprise a fluid outlet
  • the complementary curved surface is formed in the stator, or a member carried by the stator.
  • he armature is constructed from ferromagnetic material, typically from mild steel.
  • the armature is constructed as a laminated sandwich of thin strips of ferromagnetic material in order to reduce losses caused by eddy currents.
  • pole-pieces defining the poles, permanent magnet, electromagnet (where provided) and armature By mounting the pole-pieces defining the poles, permanent magnet, electromagnet (where provided) and armature in a housing, and providing passages in the housing which communicate between inlet and outlet ports in the exterior of the housing and the openings in the complementary curved surface engaged by the curved surface on the armature for opening and closing same, so an integrated fluid flow control valve and actuator is formed.
  • resilient energy storing means in an actuator significantly reduces the reaction time of the armature, (that is the time to pivot or rock like a see-saw from one home position to the other). It also increases electrical efficiency since the energy (derived from the permanent magnet flux) stored in the resiliently deformable means during the final movement of the armature into contact with the poles, reduces the electric current required to generate sufficient reverse magnetic flux to overcome the residual magnetic retention force acting on the armature, to free the armature to pivot or rock to its other home position.
  • the armature When resilient energy storing means is incorporated, the armature will normally achieve its maximum speed at the middle of the changeover from one pole to the other (i.e. midway between a pair of poles defining the two home positions). After passing through the mid position and engaging the resiliently deformable means associated with the other pole a force now acts on the armature which begins to resist onward movement of the armature towards the other pole, so that the instantaneous speed of the armature thereafter is progressively reduced, and some of the kinetic energy of the armature is converted into potential energy and stored in the energy storage means as the latter is compressed to permit the armature to approach and make contact with the said other pole, and the landing of the armature in its new position in contact with the said other pole can be almost without impact.
  • Fig 1 is a cross sectional side view of an integrated valve and magnetic actuator constructed as an embodiment of the invention for controlling the flow of fluid between inlet and outlet ports,
  • Fig 2 is an end view of the device of Fig 1, taken in the direction of arrow A,
  • Fig 3 is a diagrammatic view of the armature and valve seating arrangement of Fig 1 to an enlarged scale
  • Fig 4 is a scrap section to an enlarged scale of the lower end of the device shown in Figs 1 and 2,
  • Fig 5 is an enlarged view of the central rolling element forming part of the armature of the device of Figs 1 and 2,
  • Fig 6 is a side elevation view of another embodiment of the invention, similar to that shown in Figs 1-5, and
  • Fig 7 is an end view of the device shown in Fig 6.
  • Actuators constructed substantially as shown in the drawings have achieved some billions of complete cycles without any perceived wear and without interruption. This success is attributed to the soft landings of the armature on the respective poles due to the conversion of kinetic energy into potential energy as the armature moves through and beyond its mid- position and the spring effect that has been accelerating the armature away from one pole towards the other through its mid-position, reverses and begins to decelerate the armature as it leaves the mid-position and starts to move towards the other pole. By careful selection of magnetic force and spring force, so the arrival of the armature on each pole at the end of its travel from one to the other can be virtually without impact.
  • an armature generally designated 100 is mounted within a housing generally designated 102 to rock about a fulcrum 104, like a see-saw, between two home positions.
  • the armature 100 is shown in one of its two home positions in Fig 7 and in that position a curved underside central region 106 of the armature completely covers an opening in a valve seating surface 108 leading to a port C, leaving a similar opening on the other side of the fulcrum 104 exposed. This other opening leads to a port B.
  • the housing 102 is closed so as to form a fluid tight chamber 110, to which fluid can be supplied (or from which it can be removed) via an opening 111 in the wall thereof, which leads to a port A.
  • the armature 100 In the other home position, the armature 100 uncovers the opening leading to port C and closes off the opening leading to port B.
  • the armature is comprised of two permanent magnets 112, 114 sandwiched between three pieces of ferromagnetic material which form a central bridge 116, and two ends 118, 120 beyond the magnets.
  • the housing is comprised of upper and lower elongate ferromagnetic members 122, 124 between which is sandwiched at one end a coil 126 having a ferromagnetic core 128 and non-magnetic (typically plastics) bobbin 130.
  • each of the members 122, 124 is formed internally with two similar protrusions, forming two pairs of magnetic poles 134, 136 on one side, and 138, 140 on the other side, of the fulcrum 104.
  • the armature engages one from each of the two pairs of poles, i.e. 134 and 140 (as shown) or 136 and 138 in its other home position.
  • the armature ends 118, 120 are tapered (as shown in Fig 1).
  • the internal ends of the poles 134, 136, 138 and 140 may be inclined to allow parallel faced ends 118, 120 to fit face to face therewith.
  • the upper and lower members 122, 124 are cut away internally between the poles 134, 138 and 136, 140 to provide two rectilinear recesses into which two blocks of nonmagnetic material 142, 144 are located and secured, as by an adhesive or by rivets or bolts (not shown).
  • the poles 134-140 protrude internally beyond the internal faces of the blocks 142, 144 so that the latter do not interfere with the rocking of the armature from one set of poles to the other. In fact a clear space exists at all times between 142 and the armature.
  • armature 100 Below the armature the internal face of block 144 is dished to form the curved surface 108. Centrally of the surface is a wear resistant pin 146 (see Fig 5) which protrudes above the surface 108 to provide a fulcrum about which the armature 100 can rock.
  • the armature 100 comprises a valve closure in that its movement into its two home positions closes either 152 or 154.
  • the central underside of the armature is formed with a curved underside 156 (see both Figs 1 and 5) having a central cavity 158 in which the head of the pin 146 is received.
  • the cavity is preferably conical or frusto-conical.
  • the cavity 158 should be a triangular section groove for accommodating the curved or triangular section of the ridge.
  • the curved underside 156 may be an integral formation at the lower end of the central bridge section 116 of the armature, but more conveniently comprises a separate nonmagnetic element 160 which is secured to the underside of the bridge section 116 in any convenient manner, and is preferably constructed from hard wearing material which may be similar to that from which the fulcrum pin 146 is constructed,
  • 146 and 160 are constructed form a Nylon ® or similar plastics material.
  • rocking can be achieved even if the two surfaces have the same radius of curvature but it has been found preferable for the radius of curvature of the curved surface 156 to be less than that of the curved surface 108. This is clearly shown in Fig 5.
  • the surface 156 In order to ensure a good closing action as the curved surface 156 moves to cover openings 152 or 154, it has been found advantageous for the surface 156 to be part spherical (rather than cylindrical) and for the curved surface 108 to present a part cylindrical surface to the curved underside 156 of element 160.
  • block 144 is preferably non-magnetic, it may still be formed from a material whose surface hardness is greater than the surface hardness of the material forming element 160.
  • block 144 (or at least the surface 108 thereof) may be formed from a non-magnetic metal and element 160 (or at least the surface 156) from a plastics material which can be considered to be resiliently deformable in relation to a metal.
  • the underside surface 156 of element 160 can if necessary deform slightly to ensure a good seal around the opening 152 or 154 as the armature rocks into contact with one set of poles or the other, thereby ensuring a reliable closure of the opening 152 or 154 leading to port B or C.
  • valve will direct fluid flow from A to B or to C, (or permit fluid to flow through B or C, and to leave via A).
  • valve is merely to serve as an ON/OFF valve so as to permit or interrupt fluid flow between for example A and B, it is merely necessary to block off port C. Alternatively by blocking off B, fluid flow is between A and C.
  • springs 162, 164 are provided in passages 166, 168 in the pole pieces 134, 136 respectively.
  • the springs are held captive between closures 170, 172 and balls 174, 176.
  • the latter are held captive by a reduced diameter neck at the inboard end of each passage 166, 168 which permits the balls to protrude beyond the inner faces of the poles 134, 136 but prevent them from leaving the passages completely.
  • the springs may be compressed by adjusting the position of the closures 170, 172.
  • the passages 166, 168 are formed with an internal screw thread and the closures 170, 172 are formed with a complementary external screw thread and a screwdriver slot is formed in their outward facing ends.
  • a screwdriver blade By inserting a screwdriver blade in the slot, a closure can be turned so as to move further into, or in a direction out of, the passage, so as to compress its spring to a greater or lesser extent.
  • the permanent magnets 112, 114 are selected so as to provide sufficient magnetic flux when the armature is in either of the two home positions to retain the armature in the last position to which it has moved, and to more than overcome any spring force in the compressed spring 162 (or 164) in the pole 134 (or 136) to which it has moved. This is achieved by virtue of the closed magnetic path formed by the armature, the two poles it contacts 134, 140 (or 136, 138), the members 122, 124 and the coil core 128.
  • Movement of the armature from one position to the other is achieved by introducing magnetic flux in opposition to that established by the magnets 112, 114 so as to cause the armature ends to be repelled from the poles with which they are in contact (e.g. 134, 140) and to be attracted to the other two poles (136, 138).
  • the effect of the compressed spring 162 (or 164) acting on the armature will tend to reduce the force exerted by the latter on the surface 108 around the opening 152 (or 154) and which is closed off by the armature in that position.
  • the armature may be acted on by a stretched spring which is further extended as the armature moves through its mid position between one home position and the other. This creates a top dead centre position of the armature in which it is momentarily in unstable equilibrium. However as soon as the armature moves beyond this point, the spring begins to exert a turning moment on the armature, tending to move it in the direction it is already moving in, towards the new home position, and will also assist in holding the armature in that position when reached.
  • springs 178, 180 are provided one on each side of the armature as can be seen in Figs 2 and 4.
  • the springs are fitted between two pins 182, 184, one of which protrudes laterally through the bridge section 116 of the armature and the other through the block 144 (or the magnetic member 124).
  • the spring force exerted by the springs 178, 180 on the armature will of course tend to resist subsequent movement of the armature away from its home position. However this will be partly compensated by the accelerating force of the relevant spring 162 or 164, and may merely require a slightly larger current to flow in the winding 126 to cause the armature to begin to rock towards its other home position. Once beyond the top dead centre (mid-way) position, the effect of the springs 178, 180 will be to assist in closing the valve.
  • the core 128 is conveniently secured to the upper and lower members 122, 124 by bolts 182, 184 which can be seen in Figs 1, 2 and 4.
  • Fig 3 illustrates the forces acting on the armature and other components, where the forces, pressures, diameters, lengths and angles are denoted as follows :-
  • Fh In order to maintain the valve in a closed state Fh must be greater than Fp.
  • Mh In order to maintain a stable magnetically locked condition, Mh must be greater than Mr. Again, if a 30% safety margin is required, Mh needs to be 0.5Nm.
  • the magnetic force needs to be 8.9N. It is quite feasible to attain a magnetic force of this magnitude (which is just less than lKg), since it is possible to obtain a magnetic force of 20N using a rectilinear magnet of 10mm x 10mm cross section and 20mm length.
  • two magnets such as 112, 114 are not essential, and a single magnet can be employed in their place if desired.
  • the bridge 116 and the two magnets 112, 114 may be replaced by a single magnet.
  • magnets may be omitted from the armature altogether and one or more may be located in the magnetic circuit formed by 122, 128 and 124.
  • the core 128 of the electromagnet may be a permanent magnet. It is merely necessary that the permanent magnet(s) cause poles 134 and 138 to have the same magnetic polarity, opposite to that of poles 135 and 140.
  • an armature comprises two similar permanent magnets 200, 202, symmetrically arranged between opposite ends of a central magnetisable region 204, and magnetisable end pieces 206, 208.
  • the armature includes a bearing member 210, typically of nonmagnetic material which has a curved underside hardened bearing surface and is fitted to the central region 204 midway between the two ends 206, 208.
  • the armature is mounted within a symmetrical stator assembly of magnetisable material defining four symmetrical poles 212, 214, 216 and 218, and two electromagnet cores 220, 222.
  • Upper and lower parts 224, 226 join the ends of the cores 220, 222 and internal faces thereof define four poles 212, 214, 216 and 218.
  • a second bearing member 228 also of non- magnetisable material having an upper complementary curved and hardened surface on which the hardened curved surface of bearing member 210 will roll.
  • the radius of curvature of the curved surface of 228 is greater than the radius of curvature of the curved surface 210.
  • the openings in the bearing member 228 are covered and uncovered by the rolling action of the bearing member 210, basically as described with reference to Figs 1-5.
  • the stator comprises, or is mounted within, a fluid tight housing and a port 235 (see Fig 6) communicates with the central region of the stator/housing.
  • stator is contained within a housing, or forms part of a housing
  • flow of fluid to and from the interior of the housing can be controlled by the rocking of the armature.
  • Two electromagnet windings 236, 238 on formers 240, 242 are located around the cores 220, 222 respectively.
  • the armature and stator bearing surfaces are resiliently biased into contact by two space saving ring springs 248, 250 which are a spring-fit over two pairs of pins protruding on opposite sides of the armature and stator assembly.
  • One pair is shown in Fig 6 at 252 and 254, and the lower one of the other pair is visible in Fig 7 at 256.
  • the use of such springs reduces the overall width of the device - which may then be dictated by the width of the windings 236, 238. There may be smaller than as shown in Fig 7.
  • the ridge is a sloppy fit in the groove so as not to impede rolling motion.
  • the curved surfaces of the bearing members 210, 228 may be hardened or instead, or in addition, may be plated or otherwise coated with wear and/or erosion resistant material.
  • the flow itself can damage valve and passage surfaces, and to this end all surfaces in contact with the fluid are preferably hardened or coated or plated as aforesaid.
  • a valve such as shown in Fig 1-7, but especially as shown in Figs 6 and 7, is suitable for working "down hole” in an oil well, or in an oil well drilling operation, since it requires very little power to operate, and in any case the power is only required momentarily.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne un actionneur électromagnétique comprenant un stator définissant deux paires de pôles (134, 140, 136, 138) et un induit magnétisable allongé (100) pouvant être pivoté dans un mouvement de va-et-vient entre deux positions initiales, dans lesquelles il est en contact avec deux des quatre pôles, en passant par une position médiane équidistante des pôles. Un chemin fermé à faible réluctance pour le flux magnétique est créé par le stator et l'induit, lorsque ce dernier est en contact avec les pôles de stator dans chaque position initiale. Ce chemin à faible réluctance intègre au moins un aimant permanent (112, 114), dont le flux magnétique crée une force d'attraction entre l'induit et les pôles de position initiale avec lesquels il est en contact. Le flux de l'aimant permanent maintient l'induit dans une position initiale. Une fois excité, un électroaimant (126, 128) va modifier la durée d'une impulsion de courant, de sorte que l'induit est repoussé des deux pôles avec lesquels il est en contact et attiré vers les deux autres. Un moyen d'accumulation d'énergie élastique (162, 164), qui n'a aucun effet sur l'induit dans ou proche de sa position médiane, s'oppose au mouvement final de l'induit vers les pôles, à mesure que ce dernier s'approche desdits pôles.
PCT/GB2004/002080 2003-05-23 2004-05-14 Actionneur electromagnetique pivotant, actionneur integre et soupape de regulation de flux de fluide WO2004104462A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/034,580 US7252114B2 (en) 2003-05-30 2005-01-13 Electromagnetic fluid flow control valve

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0311879A GB2390414B (en) 2002-05-31 2003-05-23 Electromagnetic actuator and integrated actuator and fluid flow control valve
GB0311879.1 2003-05-23
GB0320397A GB0320397D0 (en) 2003-05-23 2003-09-01 Electromagnetic actuator and integrated actuator and fluid flow control valve
GB0320397.3 2003-09-01

Publications (1)

Publication Number Publication Date
WO2004104462A1 true WO2004104462A1 (fr) 2004-12-02

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PCT/GB2004/002080 WO2004104462A1 (fr) 2003-05-23 2004-05-14 Actionneur electromagnetique pivotant, actionneur integre et soupape de regulation de flux de fluide

Country Status (2)

Country Link
GB (1) GB2401926B (fr)
WO (1) WO2004104462A1 (fr)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP3297004A1 (fr) * 2016-09-15 2018-03-21 Fluid Automation Systems S.A. Actionneur electromagnetique a volet basculant
WO2020257912A1 (fr) * 2019-06-28 2020-12-30 Leggett & Platt Canada Co. Vanne magnétique
US11808374B2 (en) 2020-12-30 2023-11-07 Leggett & Platt Canada Co. Fluid management system
US12085185B2 (en) 2020-02-24 2024-09-10 Schukra Berndorf Gmbh Electrically actuated valves
US12104703B2 (en) 2019-06-28 2024-10-01 Leggett & Platt Canada Co. Fluid management system

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GB0424249D0 (en) * 2004-11-02 2004-12-01 Camcon Ltd Improved actuator requiring low power for actuation for remotely located valve operation and valve actuator combination
GB0519783D0 (en) * 2005-09-29 2005-11-09 Schlumberger Holdings Actuator
US20080142269A1 (en) * 2006-12-13 2008-06-19 Edward Richards Bi stable actuator and drilling system inlcuding same
GB201615379D0 (en) * 2016-09-09 2016-10-26 Camcon Medical Ltd Electromagnetic actuator
SE544599C2 (en) * 2020-12-18 2022-09-20 Assa Abloy Ab Actuator and lock device

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US4621660A (en) * 1984-10-12 1986-11-11 H. Kuhne Gmbh Kg Bistable magnetic valve
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* Cited by examiner, † Cited by third party
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EP3297004A1 (fr) * 2016-09-15 2018-03-21 Fluid Automation Systems S.A. Actionneur electromagnetique a volet basculant
WO2018050861A1 (fr) * 2016-09-15 2018-03-22 Fluid Automation Systems S.A. Actionneur électromagnétique à armature basculante
WO2020257912A1 (fr) * 2019-06-28 2020-12-30 Leggett & Platt Canada Co. Vanne magnétique
US12104703B2 (en) 2019-06-28 2024-10-01 Leggett & Platt Canada Co. Fluid management system
US12085185B2 (en) 2020-02-24 2024-09-10 Schukra Berndorf Gmbh Electrically actuated valves
US11808374B2 (en) 2020-12-30 2023-11-07 Leggett & Platt Canada Co. Fluid management system

Also Published As

Publication number Publication date
GB0410764D0 (en) 2004-06-16
GB2401926B (en) 2005-12-14
GB2401926A (en) 2004-11-24

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