EP0336805B1 - High pressure switch - Google Patents

High pressure switch Download PDF

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Publication number
EP0336805B1
EP0336805B1 EP19890400758 EP89400758A EP0336805B1 EP 0336805 B1 EP0336805 B1 EP 0336805B1 EP 19890400758 EP19890400758 EP 19890400758 EP 89400758 A EP89400758 A EP 89400758A EP 0336805 B1 EP0336805 B1 EP 0336805B1
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EP
European Patent Office
Prior art keywords
fact
piston
contactor
electrical
elastic blade
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.)
Expired - Lifetime
Application number
EP19890400758
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German (de)
French (fr)
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EP0336805A1 (en
Inventor
Georges Dumoulin
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Jaeger SA
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Jaeger SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder

Definitions

  • the present invention relates to the field of electrical contactors sensitive to pressure.
  • the control module generally comprises a membrane subjected to the pressure to be checked, a coil return spring which biases the membrane against said pressure and transforms the pressure into displacement, and means associated with the membrane which act on the movable contact of the contact module, when the pressure to be checked exceeds a determined threshold.
  • an electrical pressure-sensitive contactor comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade of electrically conductive material and a control module comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor, in which the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade itself.
  • the piston is made of elastic elastomeric material.
  • the elastic blade extends perpendicular to the direction of translation of the piston.
  • the conventional contactors hitherto proposed generally do not withstand pressures above 25 bars. Beyond these pressures, the membrane or the elastic piston is damaged.
  • DE-B-2,547,257 has also described an electrical contactor comprising an elastic blade cooperating with an actuating membrane which is transverse to it.
  • the elastic blade is anchored at its ends in a fixed support, on the one hand, and in a support integral with the membrane, on the other hand.
  • Document DE-C-918577 describes an electrical contactor sensitive to an external control pressure comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade of electrically conductive material and a module control comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor.
  • the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade itself, the mean plane of which extends parallel to the direction of translation of the piston.
  • the elastic blade bears on the one hand by a first end against the piston, on the other hand by a second end on a stopper linked to the body of the contactor so that the elastic blade is bent and armed at rest.
  • the object of the present invention is to improve the prior devices.
  • the object of the present invention is in particular to propose an electrical contactor adapted to detect without damage pressures exceeding 100 bars, and to tolerate overpressures of 650 bars minimum.
  • an electrical contactor sensitive to pressure of the type known per se comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade in electrically conductive material and a control module comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor, in which the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade it -even, whose mean plane of the elastic blade extends parallel to the direction of translation of the piston, the elastic blade bearing, on the one hand, by a first end against the piston, on the other hand, by a second end on a stopper linked to the body of the contactor so that the elastic blade is bent and armed at rest, characterized by the fact that the piston subjected to the pressure to be detected is rigid, and that the stop linked to the contactor body is adjustable parallel to the direction of movement of the rigid piston, this stop linked to the contactor body comprising a washer on which is
  • the present invention finds particular, but not exclusively, application in the pressure control of braking circuits or suspensions of a motor vehicle.
  • FIG. 1 shows, in a view in longitudinal axial section, an electrical contactor in accordance with the present invention.
  • the body of the contactor illustrated in the appended figure is referenced 10. It has an axis of symmetry 11.
  • the body 10 defines an internal chamber 12 capable of receiving the contact module 100 which will be defined in more detail below, and a piston rigid control 200.
  • Room 12 is blind. It opens axially at a first end 13 of the body. However, a cylindrical bore 14 centered on the axis 11 is formed at the second end 15 of the body 10 to connect the bottom of the chamber 12 to the outside.
  • the chamber 12 is delimited by two cylindrical portions 16, 17, juxtaposed axially.
  • the cylindrical portion 16 of a smaller diameter forms the bottom of the internal chamber 12. It is adjacent to the second end 15 of the body 10. The above-mentioned bore 14 opens into this portion 16.
  • the front end 18 adjacent to the first end 13 of the body 10) of the second cylindrical portion 17 of larger diameter is tapped. It receives a ring 110 having a complementary external thread 111.
  • the ring 110 serves as a support for a washer 120 placed inside the second portion 17 of the chamber 12.
  • the washer 120 itself serves as a support for a sleeve 130 placed in the cylindrical portion 17, that is to say between the washer 120 and the first cylindrical portion 16.
  • a strip 140 made of electrically conductive material passes through the washer 120.
  • the strip 140 extends parallel to the axis 11 but is offset relative to the latter inside the chamber 12.
  • the end 141 of the strip 140 carries a contact pad 142.
  • the stud 142 is formed by a screw engaged by thread in the strip 140.
  • the axis 143 of the screw 142 extends transversely to the axis 11.
  • the thread engagement of the stud 142 in the strip 140 makes it possible to adjust the radial position of the stud 142.
  • the stud 142 is positioned on the strip 140 so that its radially innermost point 144 coincides with the axis 11.
  • the adjustment of the stud 142 on the strip 140 can be operated from the outside after assembly of the contactor, thanks to an opening 19 made in the side wall of the body 10, opposite the screw 142.
  • An annular recess 20 is formed between the cylindrical portions 16 and 17. The recess 20 is directed towards the first end 13 of the body 10.
  • the sleeve 130 defines an internal flaring 131 near the recess 20.
  • the internal diameter of the channel 132 defined at the internal flaring is less than the diameter of the first cylindrical portion 16.
  • the internal flaring 131 defines an annular bearing 133 centered on the axis 11 and directed towards the bottom of the chamber 12, that is to say towards the second end 15 of the body.
  • An annular seal 134 rests against the bearing surface 133.
  • the piston 200 is engaged in the first cylindrical portion 16 of the chamber 12.
  • the piston 200 is formed by a cylindrical body centered on the axis 11 and having a diameter substantially equal, while being very slightly smaller, to the diameter of the first cylindrical portion 16 of the chamber 12.
  • the piston 200 is guided in translation parallel to the axis 11 in the chamber 12.
  • the piston 200 is provided, substantially at mid -length, an annular groove 202. This receives an annular seal 204.
  • the seal 204 preferably has a cross section in X. It rests against the cylindrical portion 16 of the chamber 12 and provides sealing between the piston 200 and the body 10.
  • the piston 200 receives the pressure applied to the bore 14 on its surface 206 transverse to the axis 11 and directed towards the second end 15 of the body.
  • the pressure applied to the bore 14 therefore tends to move the piston 200 towards the first end 13 of the body.
  • the piston 200 is biased towards the second end 15 of the body by a blade 150.
  • the latter is supported, on the one hand, by a first end 151 on the piston 200 and, on the other hand, by a second end 152 on the washer 120.
  • the piston 200 is provided on its second face 208 transverse to the axis 11 and directed towards the first end 13 of the body, with a slot 209. This is oriented diametrically relative to the axis 11. It has a width substantially equal to the thickness of the blade 150 to freely receive the aforementioned end 151 of the latter.
  • the washer 120 is provided on its face 121 directed towards the piston 200, with a slot 122 oriented diametrically relative to the axis 11 and designed to freely receive the second end 152 of the blade 150.
  • the blade 150 is slightly bent at rest. Its mean plane defined at mid-thickness of the ends 151, 152, is advantageously intersecting with the axis 11.
  • the blade 150 is made of an electrically conductive elastic material, with a neighboring thermoelastic temperature coefficient from zero.
  • the blade 150 can be formed for example of an alloy of nickel and chromium, such as the material sold under the name "DURINVAL" by the company METALIMPHY.
  • the blade 150 may be formed from a blistering blade.
  • the contactor further comprises a cap 160 set on the first end 13 of the body 10.
  • the cap 160 carries a connection blade 161 electrically connected to the strip 140.
  • the stud 142 fixed on the strip 140 is placed substantially opposite the center of the strip 150.
  • the two electrical contacts of the contact module 100 integrated into the contactor shown in the appended figure are formed one by the stud 142 associated with the strip 140, the other by the movable blade 150 also serving as a return member.
  • the two contactor output terminals are formed, however, one by the blade 161 carried by the cap 160, the other by the body 10 of the contactor itself.
  • a direct electrical connection is defined, for example, by welding or any other equivalent means between the output blade 161 and the internal strip 140.
  • the body 10 of the contactor must be made of an electrically conductive material, preferably metal.
  • the electrical connection between the body 10 and the blade 150 is ensured by the piston 200.
  • This must therefore also be made of an electrically conductive material, preferably metal.
  • the washer 120 must not electrically connect the strip 140 and the blade 150.
  • the washer 120 can be formed from electrically insulating material.
  • the strip 140 can pass through the washer 120 without contact with the latter.
  • the blade 150 rests against the stud 142 in the rest position, that is to say when no high pressure is applied to the bore 14.
  • the piston 200 When, on the other hand, the high pressure to be detected is applied to the face 206 of the piston via the bore 14, the piston 200 axially compresses the blade 150 which works in buckling.
  • the deformation in the radial direction of the blade 150 modifies the state of connection between the stud 142 and the blade 150. It will in fact be noted that when the pressure applied to the bore 14 pushes the piston 200 towards the washer 120, the radius curvature of the central curved part of the blade 150 tends to decrease.
  • the contact is interrupted between the stud 142 and the blade 150.
  • Such a type contactor is generally called downward contactor, insofar as the electrical contact closes when the pressure applied to the bore 14 is less than the threshold pressure to be detected.
  • the electrical contactor can constitute an upward contactor, having an electrical contact between the stud 142 and the blade 150 which closes when the pressure applied to bore 14 is greater than the threshold pressure to be detected.
  • the concavity of the blade 150 is directed towards the pad 142 as illustrated in FIG. 1.
  • the convexity of the blade 150 must be directed to stud 142.
  • the nominal winding of the blade 150 which determines the restoring force exerted on the piston 200 can be controlled by axial adjustment of the ring 110 serving to support the washer 120.
  • the pressure setting determining the change of state of the contactor is operated by axial adjustment of this ring 110, in combination with the adjustment in position of the stud 142 on the strip 140.
  • the washer 120 which serves as a stop linked to the body 10 for the blade 150 is adjustable parallel to the direction of movement of the rigid piston.
  • seal 202 seals the contactor, that is to say between the piston 200 urged by the pressurized fluid and the body 10, within the normal operating range.
  • the piston 200 comes to rest against the annular seal 134 which has the general shape of a flat washer transverse to the axis 11 and centered on it.
  • the seal 134 guarantees the tightness of the contactor whatever the pressure applied to the bore 14.
  • the seal 134 is glued against the bearing surface 133 of the sleeve 130.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Description

La présente invention concerne le domaine des contacteurs électriques sensibles à la pression.The present invention relates to the field of electrical contactors sensitive to pressure.

On a déjà proposé de nombreux contacteurs électriques sensibles à la pression. Ceux-ci comprennent pour l'essentiel un module de contact pourvu d'au moins un contact électrique mobile et un module de commande actionné par un fluide sous pression et muni d'un organe de rappel qui contrôle les déplacements du contact mobile. Le module de commande comprend généralement une membrane soumise à la pression à contrôler, un ressort de rappel à boudins qui sollicite la membrane à l'encontre de ladite pression et transforme la pression en déplacement, et des moyens associés à la membrane qui agissent sur le contact mobile du module de contact, lorsque la pression à contrôler dépasse un seuil déterminé.Many pressure sensitive electrical contactors have already been proposed. These essentially comprise a contact module provided with at least one movable electrical contact and a control module actuated by a pressurized fluid and provided with a return member which controls the movements of the movable contact. The control module generally comprises a membrane subjected to the pressure to be checked, a coil return spring which biases the membrane against said pressure and transforms the pressure into displacement, and means associated with the membrane which act on the movable contact of the contact module, when the pressure to be checked exceeds a determined threshold.

On a également décrit dans le document US-A-3 631 389 un contacteur électrique sensible à la pression comprenant un corps qui loge un module de contact pourvu d'au moins un contact électrique mobile formé d'une lame élastique en matériau électriquement conducteur et un module de commande comprenant un piston soumis à la pression à détecter et guidé à translation dans le corps du contacteur, dans lequel l'organe de rappel contrôlant les déplacements du contact mobile et du piston est constitué par la lame élastique elle-même.There has also been described in document US-A-3 631 389 an electrical pressure-sensitive contactor comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade of electrically conductive material and a control module comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor, in which the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade itself.

Plus précisément selon le document US-A-3 631 389, le piston est réalisé en matériau élastomère élastique. La lame élastique s'étend perpendiculairement à la direction de translation du piston.More precisely according to document US-A-3,631,389, the piston is made of elastic elastomeric material. The elastic blade extends perpendicular to the direction of translation of the piston.

De tels contacteurs électriques ont déjà rendu de grands services. Ils présentent cependant les inconvénients suivants.Such electrical contactors have already done great service. However, they have the following disadvantages.

D'une part, les contacteurs classiques jusqu'ici proposés ne supportent généralement pas des pressions supérieures à 25 bars. Au delà de ces pressions, la membrane ou le piston élastique est détérioré(e).On the one hand, the conventional contactors hitherto proposed generally do not withstand pressures above 25 bars. Beyond these pressures, the membrane or the elastic piston is damaged.

D'autre part, les contacteurs classiques haute pression présentent un encombrement non négligeable.On the other hand, conventional high pressure contactors have a non-negligible size.

On a également décrit dans le document DE-B-2 547 257 un contacteur électrique comprenant une lame élastique coopérant avec une membrane d'actionnement qui lui est transversale. La lame élastique est ancrée par ses extrémités dans un support fixe, d'une part, et dans un support solidaire de la membrane, d'autre part.DE-B-2,547,257 has also described an electrical contactor comprising an elastic blade cooperating with an actuating membrane which is transverse to it. The elastic blade is anchored at its ends in a fixed support, on the one hand, and in a support integral with the membrane, on the other hand.

Le document DE-C-918577 décrit un contacteur électrique sensible à une pression de commande externe comprenant un corps qui loge un module de contact pourvu d'au moins un contact électrique mobile formé d'une lame élastique en matériau électriquement conducteur et un module de commande comprenant un piston soumis à la pression à détecter et guidé à translation dans le corps du contacteur. Selon ce document, l'organe de rappel contrôlant les déplacements du contact mobile et du piston est constitué par la lame élastique elle-même dont le plan moyen s'étend parallèlement à la direction de translation du piston. Par ailleurs, la lame élastique prend appui d'une part par une première extrémité contre le piston, d'autre part par une seconde extrémité sur une butée liée au corps du contacteur de sorte que la lame élastique soit cintrée et armée au repos.Document DE-C-918577 describes an electrical contactor sensitive to an external control pressure comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade of electrically conductive material and a module control comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor. According to this document, the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade itself, the mean plane of which extends parallel to the direction of translation of the piston. Furthermore, the elastic blade bears on the one hand by a first end against the piston, on the other hand by a second end on a stopper linked to the body of the contactor so that the elastic blade is bent and armed at rest.

La présente invention a pour but de perfectionner les dispositifs antérieurs.The object of the present invention is to improve the prior devices.

La présente invention a notamment pour but de proposer un contacteur électrique adapté pour détecter sans dommage des pressions dépassant 100 bars, et tolérer des surpressions de 650 bars minimum.The object of the present invention is in particular to propose an electrical contactor adapted to detect without damage pressures exceeding 100 bars, and to tolerate overpressures of 650 bars minimum.

Ces buts sont atteints dans le cadre de la présente invention grâce à un contacteur électrique sensible à la pression du type connu en soi comprenant un corps qui loge un module de contact pourvu d'au moins un contact électrique mobile formé d'une lame élastique en matériau électriquement conducteur et un module de commande comprenant un piston soumis à la pression à détecter et guidé à translation dans le corps du contacteur, dans lequel l'organe de rappel contrôlant les déplacements du contact mobile et du piston est constitué par la lame élastique elle-même,
dont le plan moyen de la lame élastique s'étend parallèlement à la direction de translation du piston,
la lame élastique prenant appui, d'une part, par une première extrémité contre le piston, d'autre part, par une seconde extrémité sur une butée liée au corps du contacteur de sorte que la lame élastique soit cintrée et armée au repos, caractérisé par le fait que le piston sousmis à la pression à détecter est rigide, et que la butée liée au corps de contacteur est réglable parallèlement à la direction de déplacement du piston rigide, cette butée liée au corps de contacteur comprenant une rondelle sur laquelle prend appui la seconde extrémité de la lame élastique, et un anneau, servant d'appui à la rondelle, qui possède un filetage extérieur apte à venir en prise avec le corps de contacteur, pour régler ladite butée.These aims are achieved within the framework of the present invention by means of an electrical contactor sensitive to pressure of the type known per se comprising a body which houses a contact module provided with at least one movable electrical contact formed by an elastic blade in electrically conductive material and a control module comprising a piston subjected to the pressure to be detected and guided in translation in the body of the contactor, in which the return member controlling the movements of the movable contact and of the piston is constituted by the elastic blade it -even,
whose mean plane of the elastic blade extends parallel to the direction of translation of the piston,
the elastic blade bearing, on the one hand, by a first end against the piston, on the other hand, by a second end on a stopper linked to the body of the contactor so that the elastic blade is bent and armed at rest, characterized by the fact that the piston subjected to the pressure to be detected is rigid, and that the stop linked to the contactor body is adjustable parallel to the direction of movement of the rigid piston, this stop linked to the contactor body comprising a washer on which is supported the second end of the elastic blade, and a ring, serving as a support for the washer, which has an external thread capable of coming into engagement with the contactor body, for adjusting said stop.

La présente invention trouve notamment, mais non exclusivement, application dans le contrôle de pression des circuits de freinage ou suspensions de véhicule automobile.The present invention finds particular, but not exclusively, application in the pressure control of braking circuits or suspensions of a motor vehicle.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre, et en regard de la figure 1 annexée qui représente selon une vue en coupe axiale longitudinale un contacteur électrique conforme à la présente invention.Other characteristics, objects and advantages of the present invention will become apparent on reading the detailed description which follows, and with reference to the appended FIG. 1 which shows, in a view in longitudinal axial section, an electrical contactor in accordance with the present invention.

Le corps du contacteur illustré sur la figure annexée est référencé 10. Il possède un axe de symétrie 11. Le corps 10 définit une chambre interne 12 apte à recevoir le module de contact 100 qui sera défini plus en détail par la suite, et un piston de commande rigide 200.The body of the contactor illustrated in the appended figure is referenced 10. It has an axis of symmetry 11. The body 10 defines an internal chamber 12 capable of receiving the contact module 100 which will be defined in more detail below, and a piston rigid control 200.

La chambre 12 est borgne. Elle débouche axialement au niveau d'une première extrémité 13 du corps. Cependant, un alésage cylindrique 14 centré sur l'axe 11 est ménagé à la seconde extrémité 15 du corps 10 pour relier le fond de la chambre 12 à l'extérieur.Room 12 is blind. It opens axially at a first end 13 of the body. However, a cylindrical bore 14 centered on the axis 11 is formed at the second end 15 of the body 10 to connect the bottom of the chamber 12 to the outside.

La chambre 12 est étagée. Cela signifie qu'elle ne présente pas une section constante sur toute sa longueur.Bedroom 12 is storied. This means that it does not have a constant section over its entire length.

Pour l'essentiel, selon l'illustration de la figure annexée, la chambre 12 est délimitée par deux portions cylindriques 16, 17, juxtaposées axialement.Essentially, according to the illustration of the appended figure, the chamber 12 is delimited by two cylindrical portions 16, 17, juxtaposed axially.

La portion cylindrique 16 d'un plus faible diamètre forme le fond de la chambre interne 12. Elle est adjacente à la seconde extrémité 15 du corps 10. L'alésage 14 précité débouche dans cette portion 16.The cylindrical portion 16 of a smaller diameter forms the bottom of the internal chamber 12. It is adjacent to the second end 15 of the body 10. The above-mentioned bore 14 opens into this portion 16.

L'extrémité avant 18 adjacente à la première extrémité 13 du corps 10) de la seconde portion cylindrique 17 de plus grand diamètre est taraudée. Elle reçoit un anneau 110 possédant un filetage extérieur 111 complémentaire. L'anneau 110 sert d'appui à une rondelle 120 placée à l'intérieur de la seconde portion 17 de la chambre 12. La rondelle 120 sert elle-même d'appui à un manchon 130 placé dans la portion cylindrique 17, c'est-à-dire entre la rondelle 120 et la première portion cylindrique 16.The front end 18 adjacent to the first end 13 of the body 10) of the second cylindrical portion 17 of larger diameter is tapped. It receives a ring 110 having a complementary external thread 111. The ring 110 serves as a support for a washer 120 placed inside the second portion 17 of the chamber 12. The washer 120 itself serves as a support for a sleeve 130 placed in the cylindrical portion 17, that is to say between the washer 120 and the first cylindrical portion 16.

Une lamelle 140 en matériau électriquement conducteur traverse la rondelle 120. La lamelle 140 s'étend parallèlement à l'axe 11 mais est décentrée par rapport à celui-ci à l'intérieur de la chambre 12. L'extrémité 141 de la lamelle 140, la plus interne à la chambre 12, porte un plot de contact 142.A strip 140 made of electrically conductive material passes through the washer 120. The strip 140 extends parallel to the axis 11 but is offset relative to the latter inside the chamber 12. The end 141 of the strip 140 , the most internal to the chamber 12, carries a contact pad 142.

De préférence, le plot 142 est formé d'une vis engagée par filetage dans la lamelle 140. L'axe 143 de la vis 142 s'étend transversalement à l'axe 11. L'engagement par filetage du plot 142 dans la lamelle 140 permet de régler la position radiale du plot 142. De préférence, le plot 142 est positionné sur la lamelle 140 de telle sorte que son point 144 radialement le plus interne coïncide avec l'axe 11.Preferably, the stud 142 is formed by a screw engaged by thread in the strip 140. The axis 143 of the screw 142 extends transversely to the axis 11. The thread engagement of the stud 142 in the strip 140 makes it possible to adjust the radial position of the stud 142. Preferably, the stud 142 is positioned on the strip 140 so that its radially innermost point 144 coincides with the axis 11.

Le réglage du plot 142 sur la lamelle 140 peut être opéré de l'extérieur après assemblage du contacteur, grâce à une ouverture 19 ménagée dans la paroi latérale du corps 10, en regard de la vis 142.The adjustment of the stud 142 on the strip 140 can be operated from the outside after assembly of the contactor, thanks to an opening 19 made in the side wall of the body 10, opposite the screw 142.

Un décrochement annulaire 20 est ménagé entre les portions cylindriques 16 et 17. Le décrochement 20 est dirigé vers la première extrémité 13 du corps 10.An annular recess 20 is formed between the cylindrical portions 16 and 17. The recess 20 is directed towards the first end 13 of the body 10.

Le manchon 130 définit un évasement interne 131 à proximité du décrochement 20. Le diamètre interne du canal 132 défini au niveau de l'évasement interne est inférieur au diamètre de la première portion cylindrique 16. L'évasement interne 131 définit une portée annulaire 133 centrée sur l'axe 11 et dirigée vers le fond de la chambre 12, c'est-à-dire vers la seconde extrémité 15 du corps.The sleeve 130 defines an internal flaring 131 near the recess 20. The internal diameter of the channel 132 defined at the internal flaring is less than the diameter of the first cylindrical portion 16. The internal flaring 131 defines an annular bearing 133 centered on the axis 11 and directed towards the bottom of the chamber 12, that is to say towards the second end 15 of the body.

Un joint d'étanchéité annulaire 134 repose contre la portée d'appui 133.An annular seal 134 rests against the bearing surface 133.

Le piston 200 est engagé dans la première portion cylindrique 16 de la chambre 12. Le piston 200 est formé d'un corps cylindrique centré sur l'axe 11 et possédant un diamètre sensiblement égal, tout en étant très légèrement inférieur, au diamètre de la première portion cylindrique 16 de la chambre 12. Ainsi le piston 200 est guidé à translation parallèlement à l'axe 11 dans la chambre 12. Le piston 200 est muni, sensiblement à mi-longueur, d'une rainure annulaire 202. Celle-ci reçoit un joint annulaire d'étanchéité 204. Le joint 204 a de préférence une section droite en X. Il repose contre la portion cylindrique 16 de la chambre 12 et assure l'étanchéité entre le piston 200 et le corps 10.The piston 200 is engaged in the first cylindrical portion 16 of the chamber 12. The piston 200 is formed by a cylindrical body centered on the axis 11 and having a diameter substantially equal, while being very slightly smaller, to the diameter of the first cylindrical portion 16 of the chamber 12. Thus the piston 200 is guided in translation parallel to the axis 11 in the chamber 12. The piston 200 is provided, substantially at mid -length, an annular groove 202. This receives an annular seal 204. The seal 204 preferably has a cross section in X. It rests against the cylindrical portion 16 of the chamber 12 and provides sealing between the piston 200 and the body 10.

Le piston 200 reçoit la pression appliquée à l'alésage 14 sur sa surface 206 transversale à l'axe 11 et dirigée vers la seconde extrémité 15 du corps.The piston 200 receives the pressure applied to the bore 14 on its surface 206 transverse to the axis 11 and directed towards the second end 15 of the body.

La pression appliquée à l'alésage 14 tend par conséquent à déplacer le piston 200 vers la première extrémité 13 du corps.The pressure applied to the bore 14 therefore tends to move the piston 200 towards the first end 13 of the body.

Cependant, le piston 200 est sollicité vers la seconde extrémité 15 du corps par une lame 150. Celle-ci prend appui, d'une part, par une première extrémité 151 sur le piston 200 et, d'autre part, par un seconde extrémité 152 sur la rondelle 120.However, the piston 200 is biased towards the second end 15 of the body by a blade 150. The latter is supported, on the one hand, by a first end 151 on the piston 200 and, on the other hand, by a second end 152 on the washer 120.

Plus précisément encore, de préférence, le piston 200 est muni sur sa seconde face 208 transversale à l'axe 11 et dirigée vers la première extrémité 13 du corps, d'une fente 209. Celle-ci est orientée diamètralement par rapport à l'axe 11. Elle possède une largeur sensiblement égale à l'épaisseur de la lame 150 pour recevoir librement l'extrémité 151 précitée de celle-ci.More precisely still, preferably, the piston 200 is provided on its second face 208 transverse to the axis 11 and directed towards the first end 13 of the body, with a slot 209. This is oriented diametrically relative to the axis 11. It has a width substantially equal to the thickness of the blade 150 to freely receive the aforementioned end 151 of the latter.

De même, la rondelle 120 est munie sur sa face 121 dirigée vers le piston 200, d'une fente 122 orientée diamètralement par rapport à l'axe 11 et conçue pour recevoir librement la seconde extrémité 152 de la lame 150. De préférence, la lame 150 est légèrement cintrée au repos. Son plan moyen défini à mi-épaisseur des extrémités 151, 152, est avantageusement sécant de l'axe 11.Similarly, the washer 120 is provided on its face 121 directed towards the piston 200, with a slot 122 oriented diametrically relative to the axis 11 and designed to freely receive the second end 152 of the blade 150. Preferably, the blade 150 is slightly bent at rest. Its mean plane defined at mid-thickness of the ends 151, 152, is advantageously intersecting with the axis 11.

La lame 150 est réalisée en un matériau électriquement conducteur élastique, à coefficient de température thermoélastique voisin de zéro. La lame 150 peur être formée par exemple d'un alliage de nickel et de chrome, tel que le matériau commercialisé sous la dénomination "DURINVAL" par la société METALIMPHY.The blade 150 is made of an electrically conductive elastic material, with a neighboring thermoelastic temperature coefficient from zero. The blade 150 can be formed for example of an alloy of nickel and chromium, such as the material sold under the name "DURINVAL" by the company METALIMPHY.

Le cas échéant, la lame 150 peut être formée d'une lame cloquante.If necessary, the blade 150 may be formed from a blistering blade.

On notera à l'examen de la figure 1 que le contacteur comprend de plus un chapeau 160 serti sur la première extrémité 13 du corps 10. Le chapeau 160 porte une lame de connexion 161 reliée électriquement à la lamelle 140.It will be noted on examining FIG. 1 that the contactor further comprises a cap 160 set on the first end 13 of the body 10. The cap 160 carries a connection blade 161 electrically connected to the strip 140.

On notera que de préférence le plot 142 fixé sur la lamelle 140 est placé sensiblement en regard du centre de la lame 150.It will be noted that preferably the stud 142 fixed on the strip 140 is placed substantially opposite the center of the strip 150.

Les deux contacts électriques du module de contact 100 intégré au contacteur représenté sur la figure annexée sont formés l'un par le plot 142 associé à la lamelle 140, l'autre par la lame mobile 150 servant par ailleurs d'organe de rappel.The two electrical contacts of the contact module 100 integrated into the contactor shown in the appended figure are formed one by the stud 142 associated with the strip 140, the other by the movable blade 150 also serving as a return member.

Les deux bornes de sortie du contacteur sont formées en revanche l'une par la lame 161 portée par le chapeau 160, l'autre par le corps 10 du contacteur lui-même.The two contactor output terminals are formed, however, one by the blade 161 carried by the cap 160, the other by the body 10 of the contactor itself.

Une liaison électrique directe est définie, par exemple, par soudage ou tout autre moyen équivalent entre la lame de sortie 161 et la lamelle 140 interne.A direct electrical connection is defined, for example, by welding or any other equivalent means between the output blade 161 and the internal strip 140.

Le corps 10 du contacteur doit être réalisé en un matériau électriquement conducteur, de préférence en métal. La liaison électrique entre le corps 10 et la lame 150 est assurée par le piston 200. Celui-ci doit donc être réalisé également en un matériau électriquement conducteur, de préférence en métal.The body 10 of the contactor must be made of an electrically conductive material, preferably metal. The electrical connection between the body 10 and the blade 150 is ensured by the piston 200. This must therefore also be made of an electrically conductive material, preferably metal.

Par contre, l'homme de l'art comprendra aisément que la rondelle 120 ne doit pas relier électriquement la lamelle 140 et la lame 150. Pour cela, la rondelle 120 peut être formée en matériau électriquement isolant. En variante, la lamelle 140 peut traverser la rondelle 120 sans contact avec celle-ci.On the other hand, those skilled in the art will readily understand that the washer 120 must not electrically connect the strip 140 and the blade 150. For this, the washer 120 can be formed from electrically insulating material. Alternatively, the strip 140 can pass through the washer 120 without contact with the latter.

Le fonctionnement du contacteur électrique illustré sur la figure annexée est le suivant.The operation of the electrical contactor illustrated in the appended figure is as follows.

Au repos, lorsqu'une aucune pression élevée n'est appliquée à l'alésage 14, la lame 150 pousse le piston 200 contre le fond de la chambre 12, c'est-à-dire vers la seconde extrémité 15 du corps 10. Un premier état de liaison électrique est ainsi défini entre le plot 142 et la lame 150.At rest, when no high pressure is applied to the bore 14, the blade 150 pushes the piston 200 against the bottom of the chamber 12, that is to say towards the second end 15 of the body 10. A first state of electrical connection is thus defined between the stud 142 and the blade 150.

Selon le mode de réalisation représenté sur la figure 1 annexée, la lame 150 repose contre le plot 142 en position de repos, c'est-à-dire lorqu'aucune pression élevée n'est appliquée à l'alésage 14.According to the embodiment shown in FIG. 1 attached, the blade 150 rests against the stud 142 in the rest position, that is to say when no high pressure is applied to the bore 14.

Lorsque par contre la pression élevée à détecter est appliquée sur la face 206 du piston par l'intermédiaire de l'alésage 14, le piston 200 comprime axialement la lame 150 qui travaille en flambage. La déformation dans le sens radial de la lame 150 modifie l'état de liaison entre le plot 142 et la lame 150. On notera en effet que lorsque la pression appliquée à l'alésage 14 repousse le piston 200 vers la rondelle 120, le rayon de courbure de la partie incurvée centrale de la lame 150 tend diminuer.When, on the other hand, the high pressure to be detected is applied to the face 206 of the piston via the bore 14, the piston 200 axially compresses the blade 150 which works in buckling. The deformation in the radial direction of the blade 150 modifies the state of connection between the stud 142 and the blade 150. It will in fact be noted that when the pressure applied to the bore 14 pushes the piston 200 towards the washer 120, the radius curvature of the central curved part of the blade 150 tends to decrease.

Comme cela apparaît à l'examen de la figure annexée, selon le mode de réalisation illustré, lors de l'application de la pression à détecter sur l'alésage 14 le contact est interrompu entre le plot 142 et la lame 150. Un tel type de contacteur est dénommé généralement contacteur à la baisse, dans la mesure où le contact électrique se ferme lorsque la pression appliquée à l'alésage 14 est inférieure à la pression seuil à détecter.As appears on examining the appended figure, according to the illustrated embodiment, during the application of the pressure to be detected on the bore 14, the contact is interrupted between the stud 142 and the blade 150. Such a type contactor is generally called downward contactor, insofar as the electrical contact closes when the pressure applied to the bore 14 is less than the threshold pressure to be detected.

Une disposition inverse peut être retenue dans le cadre de la présente invention, c'est-à-dire que le contacteur électrique peut constituer un contacteur à la hausse, possédant un contact électrique entre le plot 142 et la lame 150 qui se ferme lorsque la pression appliquée à l'alésage 14 est supérieure à la pression seuil à détecter.A reverse arrangement can be adopted in the context of the present invention, that is to say that the electrical contactor can constitute an upward contactor, having an electrical contact between the stud 142 and the blade 150 which closes when the pressure applied to bore 14 is greater than the threshold pressure to be detected.

Pour cela, il suffit d'inverser la courbure de la lame 150.To do this, simply reverse the curvature of the blade 150.

En d'autres termes, pour obtenir un contact à la baisse, la concavité de la lame 150 est dirigée vers le plot 142 comme illustré sur la figure 1. En revanche pour obtenir un contact à la hausse, la convexité de la lame 150 doit être dirigée vers le plot 142.In other words, to obtain a downward contact, the concavity of the blade 150 is directed towards the pad 142 as illustrated in FIG. 1. On the other hand, to obtain an upward contact, the convexity of the blade 150 must be directed to stud 142.

L'armage nominal de la lame 150 qui détermine la force de rappel exercée sur le piston 200 peut être contrôlé par réglage axial de l'anneau 110 servant d'appui à la rondelle 120. Le tarage de la pression déterminant le changement d'état du contacteur est opéré par réglage axial de cet anneau 110, en combinaison avec le réglage en position du plot 142 sur la lamelle 140. En d'autres termes, la rondelle 120 qui sert de butée liée au corps 10 pour la lame 150 est réglable parallèlement à la direction de déplacement du piston rigide.The nominal winding of the blade 150 which determines the restoring force exerted on the piston 200 can be controlled by axial adjustment of the ring 110 serving to support the washer 120. The pressure setting determining the change of state of the contactor is operated by axial adjustment of this ring 110, in combination with the adjustment in position of the stud 142 on the strip 140. In other words, the washer 120 which serves as a stop linked to the body 10 for the blade 150 is adjustable parallel to the direction of movement of the rigid piston.

On notera que le joint d'étanchéité 202 assure l'étanchéité du contacteur, c'est-à-dire entre le piston 200 sollicité par le fluide sous pression et le corps 10, dans la plage de fonctionnement normal.It will be noted that the seal 202 seals the contactor, that is to say between the piston 200 urged by the pressurized fluid and the body 10, within the normal operating range.

En cas de surpression le piston 200 vient reposer contre le joint annulaire 134 qui a la forme générale d'une rondelle plane transversale à l'axe 11 et centré sur celui-ci. Ainsi le joint 134 garantit l'étanchéité du contacteur quelle que soit la pression appliquée sur l'alésage 14. De préférence, le joint 134 est collé contre la portée d'appui 133 du manchon 130.In the event of overpressure, the piston 200 comes to rest against the annular seal 134 which has the general shape of a flat washer transverse to the axis 11 and centered on it. Thus the seal 134 guarantees the tightness of the contactor whatever the pressure applied to the bore 14. Preferably, the seal 134 is glued against the bearing surface 133 of the sleeve 130.

Claims (17)

  1. Pressure-sensitive electrical contactor of the type known per se, comprising a body housing a contact module provided with at least one moving electrical contact formed by an elastic blade (150) made from electrically conductive material and a control module comprising a piston (200) subjected to the pressure to be detected and guided in translational movement in the body of the contactor, in which the return device controlling the movements of the moving contact and of the piston (200) consists of the elastic blade (150) itself, the mid-plane of which lies parallel to the direction of translational movement of the piston (200),
    the elastic blade (150) bearing on the one hand, through a first end (151), against the piston (200), and on the other hand, through a second end (152), on a stop (120) connected to the body of the contactor so that the elastic blade is curved and primed at rest,
    characterised by the fact that the piston (200) subjected to the pressure to be detected is rigid and that the stop (120) connected to the contactor body (1) is adjustable parallel to the direction of movement of the rigid piston (200),
    this stop (120) connected to the contactor body (10) comprising a washer (120), against which the second end (152) of the elastic blade (150) bears, and a ring, serving as a support for the washer (120), which has an external thread (111) suitable for engaging with the contactor body in order to adjust the said stop.
  2. Electrical contactor according to Claim 1, characterised by the fact that the washer (120) has a slot (122) oriented diametrically with respect to the axis (11) of the body of the contactor and designed to receive freely the said second end (152) of the blade (150).
  3. Electrical contactor according to one of Claims 1 or 2, characterised by the fact that the contact module (100) comprises the elastic blade (150) forming a moving electrical contact and a second leaf (140) provided with a contact stud (142) located substantially opposite the centre of the elastic blade (150).
  4. Electrical contactor according to Claim 3, characterised by the fact that the contact stud (142) is adjustable transversely to the axis (11) of the contactor body (10) with respect to the second leaf (140).
  5. Electrical contactor according to Claim 4, characterised by the fact that the contact stud (142) is formed by a screw engaged by means of a thread in the leaf (140).
  6. Contactor according to one of Claims 3 to 5, characterised by the fact that an opening (19) is provided in the lateral wall of the contactor body, opposite the contact stud (142), to allow adjustment of the latter with respect to the elastic blade (150).
  7. Electrical contactor according to one of Claims 3 to 6, taken in combination with Claim 3, characterised by the fact that the second leaf (140) passes through the washer (120).
  8. Electrical contactor according to Claim 7, characterised by the fact that the second leaf (140) lies parallel to the axis (11) of the contactor body.
  9. Electrical contactor according to Claim 8, characterised by the fact that the second leaf (140) is offset with respect to the axis (11) of the contactor body.
  10. Electrical contactor according to one of Claims 1 to 9, characterised by the fact that the body (10) defines an internal chamber (12) stepped in order to define a bearing surface (133) suitable for limiting the movement of the piston (200) in the event of overpressure.
  11. Electrical contactor according to Claim 10, characterised by the fact that an annular joint (134) is provided on the bearing surface (133).
  12. Electrical contactor according to one of Claims 10 or 11, characterised by the fact that the bearing surface (133) is defined on a sleeve (130) which rests against the stop (120) connected to the body (10) of the contactor.
  13. Electrical contactor according to one of Claims 1 to 12, characterised by the fact that an annular joint (204) is provided on the periphery of the piston (200).
  14. Electrical contactor according to Claim 13, characterised by the fact that the annular joint (204) provided on the periphery of the piston (200) has an X-shaped cross section.
  15. Electrical contactor according to one of Claims 1 to 14, characterised by the fact that the elastic blade (150) is a snap-action blade.
  16. Electrical contactor according to one of Claims 1 to 15, characterised by the fact that the piston (200) is provided with a slot (209) designed to receive freely the first end (151) of the elastic blade (150).
  17. Electrical contactor according to one of Claims 1 to 16, characterised by the fact that the elastic blade (150) is produced from an alloy of nickel and chrome having a thermoelastic temperature coefficient close to zero.
EP19890400758 1988-03-18 1989-03-17 High pressure switch Expired - Lifetime EP0336805B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803532 1988-03-18
FR8803532A FR2628888B1 (en) 1988-03-18 1988-03-18 IMPROVED HIGH PRESSURE CONTACTOR

Publications (2)

Publication Number Publication Date
EP0336805A1 EP0336805A1 (en) 1989-10-11
EP0336805B1 true EP0336805B1 (en) 1993-06-23

Family

ID=9364397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400758 Expired - Lifetime EP0336805B1 (en) 1988-03-18 1989-03-17 High pressure switch

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Country Link
EP (1) EP0336805B1 (en)
DE (1) DE68907250T2 (en)
FR (1) FR2628888B1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918577C (en) * 1951-04-29 1954-09-30 Standard Elek Zitaets Ges Ag counter
US2851565A (en) * 1956-10-15 1958-09-09 Pratt & Whitney Co Inc Pressure responsive switch
CH352025A (en) * 1959-03-09 1961-02-15 Hydro Mecanique De Precision S Pressure switch
US3418001A (en) * 1967-11-01 1968-12-24 Minnesota Rubber Co Fluid seal
US3501959A (en) * 1969-02-11 1970-03-24 Stewart Warner Corp Pressure sensing apparatus
US3631389A (en) * 1970-04-17 1971-12-28 Gen Motors Corp Brake system condition warning system and switch assembly therefor
US3939316A (en) * 1973-10-19 1976-02-17 Stropkay Edward J Panic stoplight system for automobiles using a fluid pressure switching device
DE2547257C3 (en) * 1975-10-22 1978-04-27 5060 Bergisch Gladbach Electrical switching contact with extremely small actuation travel

Also Published As

Publication number Publication date
FR2628888A1 (en) 1989-09-22
FR2628888B1 (en) 1994-04-08
DE68907250D1 (en) 1993-07-29
DE68907250T2 (en) 1993-09-30
EP0336805A1 (en) 1989-10-11

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