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EP1556640A1 - Linear valve actuator - Google Patents

Linear valve actuator

Info

Publication number
EP1556640A1
EP1556640A1 EP03809239A EP03809239A EP1556640A1 EP 1556640 A1 EP1556640 A1 EP 1556640A1 EP 03809239 A EP03809239 A EP 03809239A EP 03809239 A EP03809239 A EP 03809239A EP 1556640 A1 EP1556640 A1 EP 1556640A1
Authority
EP
European Patent Office
Prior art keywords
screw
actuator
rotary member
partition wall
cover
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP03809239A
Other languages
German (de)
French (fr)
Inventor
Jean-François Pfister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonceboz SA
Societe Industrielle de Sonceboz SA
Original Assignee
Sonceboz SA
Societe Industrielle de Sonceboz SA
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
Application filed by Sonceboz SA, Societe Industrielle de Sonceboz SA filed Critical Sonceboz SA
Publication of EP1556640A1 publication Critical patent/EP1556640A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • 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
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • 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
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • F16K31/508—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element

Definitions

  • the present invention relates to a linear actuator comprising a member driven in rotation by an electric motor for the linear movement of a valve part.
  • the linear actuator can in particular be used to control a valve of a gas burner.
  • Linear actuators are very widespread and used in many different applications, examples being described in international patent application WO 01/89062 A1, and European patent EP 0987477.
  • the devices described in these publications include a stepping motor -not driving a screw-nut system for the linear movement of a shaft secured to a screw.
  • the stepper motor allows the screw shaft to be moved and positioned quickly, with few mechanical parts and using a relatively simple control.
  • the actuator is intended to be used for controlling a valve of a gas burner and comprises a valve head in the form of a cone which is received in a valve seat in the form to close the gas line on which the valve is placed.
  • the valve closes automatically in the event of an electrical power cut to the valve control system.
  • the safety function in the event of a power failure known as "failsafe" is provided by a barrel spring, one end of which is fixed to one end of the screw.
  • the barrel spring applies torque to the screw in order to turn it in the direction of closing the valve.
  • the barrel spring is fixed to the screw and therefore greatly limits the linear movement of this screw.
  • the system requires a longer linear screw and therefore also a larger housing to house the barrel spring.
  • Another disadvantage of this system is that the mounting of the barrel spring is not without difficulty and negatively influences the cost of assembly and production of the actuator.
  • an object of the invention is to provide a linear actuator of the screw-nut type for controlling a valve with a so-called "failsafe" safety system which is efficient, reliable and economical to manufacture and to assemble.
  • the linear actuator for controlling a valve comprises a motor part and an actuating part comprising a rotary member provided with a threaded part complementary to the threading of a linear movement screw. , the rotary member being able to be driven in rotation by the motor part and being supported by bearings.
  • the linear actuator further includes an axial compression coil spring mounted in compression between a valve portion mounted at one end of the screw and the actuator housing, the threaded portions of the actuator formed of threads having an angle ⁇ with respect to the octagonal plane to the axial direction of movement of the screw, whose characteristic tan ( ⁇ ) is greater than the coefficient of friction ⁇ between the screw and the rotary member, so that the screw is reversible.
  • the compression coil spring moves the valve head axially to its closed position, reliably in view of the reversibility of the screw-nut system, in a construction that is relatively simple to manufacture and to to assemble.
  • the axial travel of the screw can be relatively large without adversely affecting the performance and reliability of the system, while allowing the actuator to have a very rigid and compact construction.
  • Fig. 1 is a sectional view of a linear actuator of the screw-nut type for controlling a valve according to the invention.
  • an actuator 1 comprises an electric motor part 2, an actuation part 3 and a conductive partition wall 4.
  • the partition wall 4 disposed between the actuation part 3 and the motor part 2 is continuous and s 'extends to the outside of the actuator, thus forming a very efficient and reliable electrical and physical seal between these parts.
  • the electric motor part 2 comprises a stepping motor having aspects similar to conventional stepping motors, such as the stator 5, comprising two wound parts 6 separated by an air gap 7 of permanent magnets 8 mounted on a rotary member 9 of the actuating part 3.
  • the use of a stepping motor is advantageous since it allows the position of the member to be controlled to be easily and quickly adjusted in a compact and inexpensive construction expensive. Other types of reversible motors can nevertheless be used in the present invention.
  • the actuating part 3 comprises the rotary member 9, which is provided with a threaded part 10 engaging a complementary member in the form of a screw 11 having a threaded part 12, a cover 13, a body part 14 and bearings 15, 16 for the axial and radial support of the rotary member 9.
  • the rotation of the rotary member 9 causes the axial displacement of the screw 11 which is provided with an element or form of axial guide 17, cooperating with an element or a form of axial guide complementary to the cover 13 to block the rotation of the screw.
  • the screw 11 is coupled at one end to a valve head 37 intended to be inserted in a complementary valve seat (not shown) for controlling the flow of combustible gas in a fuel supply or flow system, a specific example being a flow control system for gas burners.
  • the actuator further comprises a coil spring 38 mounted axially in compression between the valve head 37 and the actuator housing, in particular the cover 13.
  • the end of the coil spring 19 is mounted in a housing 39 in the cover. 13 and the other end is mounted in a housing 40 in the valve head 37.
  • the spring 38 can be mounted around the screw 11 of the cover 13 before mounting the valve head 37 on the screw 11, for example by screwing or other fixing means.
  • the coil spring 19 in compression therefore exerts an axial force on the screw and the valve head 37 towards the valve seat, which makes it possible to close the valve in the event of a power failure to the stepping motor.
  • the threads 42 of the threaded parts 10, 12 of the rotary member 9 respectively of the screw 11 are arranged at an angle ⁇ whose value tan ( ⁇ ) is larger than the coefficient of friction ⁇ between the screw and the rotary member.
  • the threaded parts can be provided with two, three or even four threads.
  • this construction according to the invention makes it possible to produce a valve control system with a high level of security in the event of a breakdown in a construction comprising few parts, being inexpensive and easy to assemble.
  • the coil spring 38 can be assembled outside the actuator before mounting the valve head 37 to the screw 11.
  • the axial stroke of the valve part can to be relatively large.
  • the partition wall 4 has a cylindrical part 19 in the air gap 7 between the stator 5 and the magnets 8 on the rotary member 9, a bottom part 20 and an external part 21 in the form of a flange which has a surface 32 intended to be mounted against a support or wall of a device to be controlled.
  • the partition wall 4, or at least the part 19 in the air gap 7, may be made of a material having good magnetic permeability so as to increase the magnetic flux between the stator 5 and the magnets 8.
  • the stator 5 of the motor is positioned around the partition wall 4 and the actuating part 3 is positioned inside the cylindrical part 19 by respectively axial and radial positioning surfaces 33, 34 of the body part 14 and by positioning surfaces 35 of the cover 13, all these surfaces being in abutment against the partition wall.
  • the cover 13 is driven into a complementary cylindrical housing 36 of the partition wall.
  • the partition wall is also a structural element allowing the assembly of the motor part with the actuating part 3.
  • the bearings 15, 16 of the rotary member are in the form of ball bearings with three or four contact points for the axial and radial positioning of the rotary member, a bearing being arranged on each side of the threaded part 10 of the rotary organ.
  • One of the bearings 15 is disposed between the cover portion 13 and the rotary member 9, and the other bearing 16 is disposed between the rotary member and the body portion 14 which is mounted against the partition wall 4.
  • the paths bearing 22, 23 of the ball bearing 15 are secured to the cover 13 respectively of the rotary member 9, and the raceways 24, 25 of the ball bearing 16 are secured to the rotary member 9 respectively of the part of body 14.
  • An elastic disc 26 mounted between the bottom 20 of the partition wall and of the body part 14 makes it possible to eliminate the axial play and to adjust the axial force on the bearings 15, 16.
  • the actuator is formed of few parts which are easy to assemble, which greatly reduces the manufacturing cost.
  • the body part 14, the ball bearings, the rotary member and the cover can be assembled by insertion into the partition wall in an axial direction, which facilitates the automation of the assembly processes of the actuator, the cover 13 is simply expelled into a housing formed by the partition wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

The invention concerns a linear actuator comprising a motor part (2) and an actuating device part (3) including a rotary member (9) provided with a threaded portion (10) matching the thread of a linear displacement screw (11), the rotary member being adapted to be driven in rotation by the motor part and being supported by bearings (15, 16). The linear actuator further comprises an axial compression coil spring (19) compression-mounted between a valve head (37) mounted at one end of the screw (11) and the actuator housing, the screw threaded part (10) consisting of at least one thread having an angle alpha relative to the plane orthogonal to the screw axial displacement direction, whereof the tan characteristic ( alpha ) is greater than the coefficient of friction mu between the screw and the rotary member, so that the screw is reversible.

Description

Actionneur linéaire pour vannes Linear actuator for valves
La présente invention concerne un actionneur linéaire comprenant un organe entraîné en rotation par un moteur électrique pour le déplacement linéaire d'une partie de vanne.The present invention relates to a linear actuator comprising a member driven in rotation by an electric motor for the linear movement of a valve part.
L'actionneur linéaire peut notamment être utilisé pour commander une vanne d'un brûleur à gaz. Les actionneurs linéaires sont très répandus et utilisés dans beaucoup d'applications différentes, des exemples étant décrits dans la demande de brevet internationale WO 01/89062 A1 , et le brevet européen EP 0987477. Les dispositifs décrits dans ces publications comportent un moteur pas-à-pas entraînant un système vis-écrou pour le déplacement linéaire d'un arbre solidaire d'une vis. Le moteur pas-à-pas permet de déplacer et positionner l'arbre de la vis rapidement, avec peu de pièces mécaniques et en utilisant une commande relativement simple.The linear actuator can in particular be used to control a valve of a gas burner. Linear actuators are very widespread and used in many different applications, examples being described in international patent application WO 01/89062 A1, and European patent EP 0987477. The devices described in these publications include a stepping motor -not driving a screw-nut system for the linear movement of a shaft secured to a screw. The stepper motor allows the screw shaft to be moved and positioned quickly, with few mechanical parts and using a relatively simple control.
Dans EP-A-987477, l'actionneur est destiné à être utilisé pour la commande d'une vanne d'un brûleur à gaz et comporte une tête de vanne sous forme d'un cône qui est reçu dans un siège de vanne de forme complémentaire pour fermer la conduite de gaz sur laquelle la vanne est placée.In EP-A-987477, the actuator is intended to be used for controlling a valve of a gas burner and comprises a valve head in the form of a cone which is received in a valve seat in the form to close the gas line on which the valve is placed.
Dans le système d'alimentation de gaz, il est important que la vanne se ferme automatiquement en cas de coupure de courant électrique au système de commande de la vanne. Dans l'actionneur décrit dans le brevet précité, la fonction de sécurité en cas de coupure de courant, dite "failsafe", est assurée par un ressort à barillet, dont une extrémité est fixée à une extrémité de la vis. Le ressort à barillet applique un couple sur la vis afin de la tourner dans le sens de la fermeture de la vanne. En cas de coupure de courant du moteur de l'actionneur linéaire, il y a donc une fermeture automatique de la vanne par l'action du ressort à barillet sur la vis. Un désavantage important du dispositif précité est que le ressort à barillet est fixé à la vis et limite donc fortement le déplacement linéaire de cette vis. D'autre part, le système nécessite une vis linéaire plus longue et, par conséquent, un boîtier également plus volumineux pour loger le ressort à barillet.In the gas supply system, it is important that the valve closes automatically in the event of an electrical power cut to the valve control system. In the actuator described in the aforementioned patent, the safety function in the event of a power failure, known as "failsafe", is provided by a barrel spring, one end of which is fixed to one end of the screw. The barrel spring applies torque to the screw in order to turn it in the direction of closing the valve. In the event of a power failure of the linear actuator motor, there is therefore an automatic closing of the valve by the action of the barrel spring on the screw. A major disadvantage of the aforementioned device is that the barrel spring is fixed to the screw and therefore greatly limits the linear movement of this screw. On the other hand, the system requires a longer linear screw and therefore also a larger housing to house the barrel spring.
Un autre désavantage de ce système est que le montage du ressort à barillet n'est pas sans difficulté et influence négativement le coût de l'assemblage et de production de l'actionneur.Another disadvantage of this system is that the mounting of the barrel spring is not without difficulty and negatively influences the cost of assembly and production of the actuator.
Au vu de ces inconvénients, un but de l'invention est de réaliser un actionneur linéaire de type vis-écrou pour la commande d'une vanne avec un système de sécurité dit "failsafe" qui est performant, fiable et économe à fabriquer et à assembler.In view of these drawbacks, an object of the invention is to provide a linear actuator of the screw-nut type for controlling a valve with a so-called "failsafe" safety system which is efficient, reliable and economical to manufacture and to assemble.
Il est aussi avantageux de réaliser un actionneur linéaire du type précité qui est compact, rigide et précis.It is also advantageous to produce a linear actuator of the aforementioned type which is compact, rigid and precise.
Des buts de l'invention sont réalisés par un actionneur linéaire selon la revendication 1.Objects of the invention are achieved by a linear actuator according to claim 1.
Dans la présente invention, l'actionneur linéaire pour la commande d'une vanne, comporte une partie de moteur et une partie de dispositif d'actionnement comprenant un organe rotatif muni d'une partie filetée complémentaire au filetage d'une vis à déplacement linéaire, l'organe rotatif pouvant être entraîné en rotation par la partie de moteur et étant supporté par des paliers. L'actionneur linéaire comporte en outre un ressort à boudin à compression axiale monté en compression entre une partie de vanne montée à une extrémité de la vis et le boîtier de l'actionneur, les parties filetées de l'actionneur formées de filets ayant un angle α par rapport au plan octogonal à la direction axiale de déplacement de la vis, dont la caractéristique tan (α) est plus grande que le coefficient de frottement μ entre la vis et l'organe rotatif, de façon à ce que la vis est réversible.In the present invention, the linear actuator for controlling a valve comprises a motor part and an actuating part comprising a rotary member provided with a threaded part complementary to the threading of a linear movement screw. , the rotary member being able to be driven in rotation by the motor part and being supported by bearings. The linear actuator further includes an axial compression coil spring mounted in compression between a valve portion mounted at one end of the screw and the actuator housing, the threaded portions of the actuator formed of threads having an angle α with respect to the octagonal plane to the axial direction of movement of the screw, whose characteristic tan (α) is greater than the coefficient of friction μ between the screw and the rotary member, so that the screw is reversible.
Avantageusement, en cas de coupure de courant, le ressort à boudin en compression déplace la tête de vanne axialement jusque dans sa position fermée, de manière fiable au vu de la réversibilité du système vis-écrou, dans une construction relativement simple à fabriquer et à assembler.Advantageously, in the event of a power cut, the compression coil spring moves the valve head axially to its closed position, reliably in view of the reversibility of the screw-nut system, in a construction that is relatively simple to manufacture and to to assemble.
D'autre part, la course axiale de la vis peut être relativement importante sans nuire à la performance et à la fiabilité du système, tout en permettant à l'actionneur d'avoir une construction très rigide et compacte.On the other hand, the axial travel of the screw can be relatively large without adversely affecting the performance and reliability of the system, while allowing the actuator to have a very rigid and compact construction.
D'autres buts et aspects avantageux de l'invention ressortiront des revendications et de la description et du dessin annexé, dans lequel:Other objects and advantageous aspects of the invention will emerge from the claims and from the description and the appended drawing, in which:
la Fig. 1 est une vue en coupe d'un actionneur linéaire de type vis-écrou pour la commande d'une vanne selon l'invention.Fig. 1 is a sectional view of a linear actuator of the screw-nut type for controlling a valve according to the invention.
En faisant référence à la Fig. 1 , un actionneur 1 comporte une partie de moteur électrique 2, une partie d'actionnement 3 et une paroi de séparation conductrice 4. La paroi de séparation 4 disposée entre la partie d'actionnement 3 et la partie de moteur 2 est continue et s'étend jusqu'à l'extérieur de l'actionneur, formant ainsi une étanchéité électrique et physique très efficace et fiable entre ces parties. La partie de moteur électrique 2 comporte un moteur pas-à-pas ayant des aspects similaires à des moteurs pas-à-pas conventionnels, tels que le stator 5, comportant deux parties bobinées 6 séparées par un entrefer 7 d'aimants permanents 8 montés sur un organe rotatif 9 de la partie d'actionnement 3. L'utilisation d'un moteur pas-à-pas est avantageuse puisqu'il permet de facilement et rapidement régler la position de l'organe à commander dans une construction compacte et peu coûteuse. D'autres types de moteurs réversibles peuvent néanmoins être utilisés dans la présente invention.Referring to Fig. 1, an actuator 1 comprises an electric motor part 2, an actuation part 3 and a conductive partition wall 4. The partition wall 4 disposed between the actuation part 3 and the motor part 2 is continuous and s 'extends to the outside of the actuator, thus forming a very efficient and reliable electrical and physical seal between these parts. The electric motor part 2 comprises a stepping motor having aspects similar to conventional stepping motors, such as the stator 5, comprising two wound parts 6 separated by an air gap 7 of permanent magnets 8 mounted on a rotary member 9 of the actuating part 3. The use of a stepping motor is advantageous since it allows the position of the member to be controlled to be easily and quickly adjusted in a compact and inexpensive construction expensive. Other types of reversible motors can nevertheless be used in the present invention.
La partie d'actionnement 3 comporte l'organe rotatif 9, qui est muni d'une partie filetée 10 engageant un organe complémentaire sous forme d'une vis 11 ayant une partie filetée 12, un couvercle 13, une partie de corps 14 et des paliers 15, 16 pour le support axial et radial de l'organe rotatif 9.The actuating part 3 comprises the rotary member 9, which is provided with a threaded part 10 engaging a complementary member in the form of a screw 11 having a threaded part 12, a cover 13, a body part 14 and bearings 15, 16 for the axial and radial support of the rotary member 9.
La rotation de l'organe rotatif 9 entraîne le déplacement axial de la vis 11 qui est munie d'un élément ou forme de guidage axial 17, coopérant avec un élément ou une forme de guidage axial complémentaire du couvercle 13 pour bloquer la rotation de la vis. La vis 11 est couplée à une extrémité à une tête de vanne 37 destinée à être insérée dans un siège de vanne complémentaire (non montré) pour la commande du débit de gaz combustible dans un système d'alimentation ou d'écoulement de combustible, un exemple spécifique étant un système de réglage du débit pour brûleurs à gaz.The rotation of the rotary member 9 causes the axial displacement of the screw 11 which is provided with an element or form of axial guide 17, cooperating with an element or a form of axial guide complementary to the cover 13 to block the rotation of the screw. The screw 11 is coupled at one end to a valve head 37 intended to be inserted in a complementary valve seat (not shown) for controlling the flow of combustible gas in a fuel supply or flow system, a specific example being a flow control system for gas burners.
L'actionneur comporte en outre un ressort à boudin 38 monté axialement en compression entre la tête de vanne 37 et le boîtier de l'actionneur, notamment le couvercle 13. L'extrémité du ressort à boudin 19 est monté dans un logement 39 du couvercle 13 et l'autre extrémité est montée dans un logement 40 dans la tête de vanne 37. Le ressort 38 peut être monté autour de la vis 11 du couvercle 13 avant le montage de la tête de vanne 37 sur la vis 11 , par exemple par vissage ou autre moyen de fixation. Le ressort à boudin 19 en compression exerce donc une force axiale sur la vis et la tête de vanne 37 vers le siège de vanne, ce qui permet de fermer la vanne en cas de coupure de courant au moteur pas-à-pas.The actuator further comprises a coil spring 38 mounted axially in compression between the valve head 37 and the actuator housing, in particular the cover 13. The end of the coil spring 19 is mounted in a housing 39 in the cover. 13 and the other end is mounted in a housing 40 in the valve head 37. The spring 38 can be mounted around the screw 11 of the cover 13 before mounting the valve head 37 on the screw 11, for example by screwing or other fixing means. The coil spring 19 in compression therefore exerts an axial force on the screw and the valve head 37 towards the valve seat, which makes it possible to close the valve in the event of a power failure to the stepping motor.
Pour permettre le déplacement axial de la vis lors d'une coupure de courant, les filets 42 des parties filetées 10, 12 de l'organe rotatif 9 respectivement de la vis 11 sont disposés à un angle α dont la valeur tan (α) est plus grande que le coefficient de frottement μ entre la vis et l'organe rotatif. Au vu de cet angle de filet α relativement prononcé, les parties filetées peuvent être munies deux, trois ou même quatre filets.To allow the axial displacement of the screw during a power cut, the threads 42 of the threaded parts 10, 12 of the rotary member 9 respectively of the screw 11 are arranged at an angle α whose value tan (α) is larger than the coefficient of friction μ between the screw and the rotary member. In view of this relatively pronounced thread angle α, the threaded parts can be provided with two, three or even four threads.
Avantageusement, cette construction selon l'invention permet de réaliser un système de commande de vanne avec un niveau élevé de sécurité en cas de panne dans une construction comportant peu de pièces, étant peu coûteuse et facile à assembler. Dans la forme d'exécution illustrée, le ressort à boudin 38 peut être assemblé à l'extérieur de l'actionneur avant le montage de la tête de vanne 37 à la vis 11. En outre, la course axiale de la partie de vanne peut être relativement importante.Advantageously, this construction according to the invention makes it possible to produce a valve control system with a high level of security in the event of a breakdown in a construction comprising few parts, being inexpensive and easy to assemble. In the illustrated embodiment, the coil spring 38 can be assembled outside the actuator before mounting the valve head 37 to the screw 11. In addition, the axial stroke of the valve part can to be relatively large.
La paroi de séparation 4 comporte une partie cylindrique 19 dans l'entrefer 7 entre le stator 5 et les aimants 8 sur l'organe rotatif 9, une partie de fond 20 et une partie extérieure 21 sous forme de flasque qui présente une surface 32 destinée à être montée contre un support ou une paroi d'un dispositif à commander. La paroi de séparation 4, ou tout au moins la partie 19 dans l'entrefer 7, peut être en un matériau ayant une bonne perméabilité magnétique de façon à augmenter le flux magnétique entre le stator 5 et les aimants 8.The partition wall 4 has a cylindrical part 19 in the air gap 7 between the stator 5 and the magnets 8 on the rotary member 9, a bottom part 20 and an external part 21 in the form of a flange which has a surface 32 intended to be mounted against a support or wall of a device to be controlled. The partition wall 4, or at least the part 19 in the air gap 7, may be made of a material having good magnetic permeability so as to increase the magnetic flux between the stator 5 and the magnets 8.
Le stator 5 du moteur se positionne autour de la paroi de séparation 4 et la partie d'actionnement 3 se positionne à l'intérieur de la partie cylindrique 19 par des surfaces de positionnement respectivement axiale et radiale 33, 34 de la partie de corps 14 et par des surfaces de positionnement 35 du couvercle 13, toutes ces surfaces étant en appui contre la paroi de séparation. Le couvercle 13 est chassé dans un logement complémentaire cylindrique 36 de la paroi de séparation.The stator 5 of the motor is positioned around the partition wall 4 and the actuating part 3 is positioned inside the cylindrical part 19 by respectively axial and radial positioning surfaces 33, 34 of the body part 14 and by positioning surfaces 35 of the cover 13, all these surfaces being in abutment against the partition wall. The cover 13 is driven into a complementary cylindrical housing 36 of the partition wall.
Avantageusement, la paroi de séparation est également un élément structurel permettant l'assemblage de la partie de moteur avec la partie d'actionnement 3. Les paliers 15, 16 de l'organe rotatif sont sous forme de butées à billes à trois ou à quatre points de contact pour le positionnement axial et radial de l'organe rotatif, un palier étant disposé de chaque côté de la partie filetée 10 de l'organe rotatif. Un des paliers 15 est disposé entre la partie de couvercle 13 et l'organe rotatif 9, et l'autre palier 16 est disposé entre l'organe rotatif et la partie de corps 14 qui est montée contre la paroi de séparation 4. Les chemins de roulement 22, 23 du roulement à billes 15 sont solidaires du couvercle 13 respectivement de l'organe rotatif 9, et les chemins de roulement 24, 25 de la butée à billes 16 sont solidaires de l'organe rotatif 9 respectivement de la partie de corps 14.Advantageously, the partition wall is also a structural element allowing the assembly of the motor part with the actuating part 3. The bearings 15, 16 of the rotary member are in the form of ball bearings with three or four contact points for the axial and radial positioning of the rotary member, a bearing being arranged on each side of the threaded part 10 of the rotary organ. One of the bearings 15 is disposed between the cover portion 13 and the rotary member 9, and the other bearing 16 is disposed between the rotary member and the body portion 14 which is mounted against the partition wall 4. The paths bearing 22, 23 of the ball bearing 15 are secured to the cover 13 respectively of the rotary member 9, and the raceways 24, 25 of the ball bearing 16 are secured to the rotary member 9 respectively of the part of body 14.
Un disque élastique 26 monté entre le fond 20 de la paroi de séparation et de la partie de corps 14 permet d'éliminer le jeux axial et de régler la force axiale sur les paliers 15, 16.An elastic disc 26 mounted between the bottom 20 of the partition wall and of the body part 14 makes it possible to eliminate the axial play and to adjust the axial force on the bearings 15, 16.
Avantageusement, l'actionneur est formé de peu de pièces qui sont faciles à assembler, ce qui réduit fortement le coût de fabrication. La partie de corps 14, les roulements à billes, l'organe rotatif et le couvercle peuvent être assemblés par insertion dans la paroi de séparation dans une direction axiale, ce qui facilite l'automatisation des procédés d'assemblage de l'actionneur, le couvercle 13 étant simplement chassé dans un logement formé par la paroi de séparation. Advantageously, the actuator is formed of few parts which are easy to assemble, which greatly reduces the manufacturing cost. The body part 14, the ball bearings, the rotary member and the cover can be assembled by insertion into the partition wall in an axial direction, which facilitates the automation of the assembly processes of the actuator, the cover 13 is simply expelled into a housing formed by the partition wall.

Claims

Revendications claims
1. Actionneur linéaire pour la commande d'une vanne, comportant une partie de moteur (2) et une partie de dispositif d'actionnement (3) comprenant un organe rotatif (9) muni d'une partie filetée (10) complémentaire à une partie filetée (12) au filetage d'une vis (11) à déplacement linéaire, l'organe rotatif pouvant être entraîné en rotation par la partie de moteur et étant supporté par des paliers (15, 16), caractérisé en ce que l'actionneur linéaire comporte en outre un ressort à boudin (19) à compression axiale monté en compression entre une tête de vanne (37) montée à une extrémité de la vis (11) et le boîtier de l'actionneur, la partie filetée (10) de la vis formée d'au moins un filet ayant un angle α par rapport au plan orthogonal à la direction axiale de déplacement de la vis, dont la caractéristique tan (α) est plus grande que le coefficient de frottement μ entre la vis et l'organe rotatif, de façon à ce que la vis est réversible.1. Linear actuator for controlling a valve, comprising a motor part (2) and an actuating device part (3) comprising a rotary member (9) provided with a threaded part (10) complementary to a threaded part (12) to the thread of a screw (11) with linear movement, the rotary member being able to be driven in rotation by the motor part and being supported by bearings (15, 16), characterized in that the linear actuator further comprises an axial compression coil spring (19) mounted in compression between a valve head (37) mounted at one end of the screw (11) and the actuator housing, the threaded part (10) of the screw formed of at least one thread having an angle α relative to the plane orthogonal to the axial direction of movement of the screw, the characteristic tan (α) of which is greater than the coefficient of friction μ between the screw and l 'rotary member, so that the screw is reversible.
2. Actionneur selon la revendication 1 , caractérisé en ce que la partie filetée de la vis comprend au moins deux filets.2. Actuator according to claim 1, characterized in that the threaded part of the screw comprises at least two threads.
3. Actionneur selon l'une des revendications précédentes, caractérisé en ce que le ressort à boudin est monté à l'extérieur de l'actionneur autour d'une partie de couvercle (13) faisant partie du boîtier de l'actionneur.3. Actuator according to one of the preceding claims, characterized in that the coil spring is mounted outside the actuator around a cover part (13) forming part of the actuator housing.
4. Actionneur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en outre une paroi de séparation (4) séparant la partie de moteur de la partie de dispositif d'actionnement et ayant une partie disposée dans un entrefer (8) entre la partie de moteur et l'organe rotatif de la partie d'actionnement, la paroi de séparation étant également un élément structurel permettant le montage et le positionnement de la partie de moteur et de la partie d'actionnement. 4. Actuator according to one of the preceding claims, characterized in that it further comprises a partition wall (4) separating the motor part from the actuating device part and having a part arranged in an air gap (8 ) between the motor part and the rotary member of the actuating part, the partition wall also being a structural element allowing the mounting and positioning of the motor part and of the actuating part.
5. Actionneur selon la revendication précédente, caractérisé en ce que le boîtier de l'actionneur comprend un couvercle (13) comprenant une partie d'un palier de l'actionneur, l'organe rotatif, les paliers et le couvercle (13) pouvant être insérés axialement dans un logement formé par la paroi de séparation (4), le couvercle (13) étant chassé dans un logement complémentaire de la paroi de séparation (4).5. Actuator according to the preceding claim, characterized in that the actuator housing comprises a cover (13) comprising part of a bearing of the actuator, the rotary member, the bearings and the cover (13) being able be inserted axially in a housing formed by the partition wall (4), the cover (13) being driven into a housing complementary to the partition wall (4).
6. Actionneur selon la revendication précédente, caractérisé en ce que l'actionneur comprend une partie de corps (14) disposée à une extrémité de l'organe rotatif opposé au couvercle (13) et comprenant une partie du palier (16), cette partie de corps (14) pouvant être insérée axialement dans la paroi de séparation (4) et étant en butée axialement contre la paroi de séparation à travers des moyens élastiques (26). 6. Actuator according to the preceding claim, characterized in that the actuator comprises a body part (14) disposed at one end of the rotary member opposite the cover (13) and comprising a part of the bearing (16), this part body (14) which can be inserted axially in the partition wall (4) and which is axially abutted against the partition wall by elastic means (26).
EP03809239A 2002-10-28 2003-09-24 Linear valve actuator Ceased EP1556640A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH17992002 2002-10-28
CH01799/02A CH696551A5 (en) 2002-10-28 2002-10-28 linear actuator for controlling a valve.
PCT/CH2003/000640 WO2004038269A1 (en) 2002-10-28 2003-09-24 Linear valve actuator

Publications (1)

Publication Number Publication Date
EP1556640A1 true EP1556640A1 (en) 2005-07-27

Family

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Application Number Title Priority Date Filing Date
EP03809239A Ceased EP1556640A1 (en) 2002-10-28 2003-09-24 Linear valve actuator

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US (1) US20060071190A1 (en)
EP (1) EP1556640A1 (en)
AU (1) AU2003260238A1 (en)
CH (1) CH696551A5 (en)
WO (1) WO2004038269A1 (en)

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Also Published As

Publication number Publication date
CH696551A5 (en) 2007-07-31
AU2003260238A1 (en) 2004-05-13
US20060071190A1 (en) 2006-04-06
WO2004038269A1 (en) 2004-05-06

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