EP0817223B1 - Deionization device for gases, particularly for cut off gases in an arc extinguishing chamber of a low tension molded case circuit breaker and arc extinguishing chamber equipped with such a device - Google Patents

Deionization device for gases, particularly for cut off gases in an arc extinguishing chamber of a low tension molded case circuit breaker and arc extinguishing chamber equipped with such a device Download PDF

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Publication number
EP0817223B1
EP0817223B1 EP97410062A EP97410062A EP0817223B1 EP 0817223 B1 EP0817223 B1 EP 0817223B1 EP 97410062 A EP97410062 A EP 97410062A EP 97410062 A EP97410062 A EP 97410062A EP 0817223 B1 EP0817223 B1 EP 0817223B1
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EP
European Patent Office
Prior art keywords
yarns
gases
arc extinguishing
extinguishing chamber
undulated
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EP97410062A
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German (de)
French (fr)
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EP0817223A1 (en
Inventor
Marc Rival
Christophe Kilindjian
Yves Clery
Serge Bonente
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/342—Venting arrangements for arc chutes

Definitions

  • the present invention relates to a gas deionization device intended in particular for be placed in the exhaust port area of a switch-off chamber low-voltage multipole circuit breaker with molded case, and an arc extinguishing chamber equipped of this device.
  • European patent EP 0 022 708 describes a deionization device comprising a screen porous formed from agglomerated beads made from copper. Interstices are formed between the balls for the passage of the breaking gases to the outside environment. This device, of compact structure, allows relatively efficient cooling of gases cut-off ventilated from an extinguishing chamber with high breaking capacity.
  • the present invention provides an improved structure deionization device compact, allowing even more efficient cooling of the breaking gases leaving towards the external environment, so as to reduce external manifestations.
  • This device is intended to be incorporated in an arc extinguishing chamber capable of high cutoff and has a structure adapted to the arc energy developed in said room.
  • the subject of the present invention is a device for deionizing gases, comprising a porous screen intended in particular to be arranged in the vicinity of the orifice exhaust from the breaking chamber of a low voltage circuit breaker to ensure cooling of the breaking gases generated during the separation of the contacts after tripping of the circuit breaker,
  • the porous screen aforementioned comprises at least one fabric known as reps comprising an intertwining of straight threads spaced apart and parallel to each other with wavy wires tightly joined together, said wires wavy extending substantially perpendicular to said straight and passing wires alternately above and below at least one of the successive straight wires.
  • the above-mentioned fabric (s) is (are) produced in one corrosion-resistant metallic material such as stainless steel or nickel.
  • each fabric has substantially shaped meshes triangular intended for the passage of gas and each defined by a straight wire and two wires wavy tangent to each other in the median plane of the tissue.
  • At least one of the abovementioned fabrics comprises threads wavy passing alternately above and below only one straight wire at a time, and arranged in pairs so that when one passes over a straight wire, the other goes below this same straight wire.
  • At least one of the aforementioned fabrics comprises threads wavy passing alternately below and above two straight wires at a time, each times with offset of a straight wire compared to the previous wavy wire, the wavy wires being nested.
  • the corrugated threads are the weft threads.
  • the diameter of the corrugated wires is smaller than that of the wires rights.
  • it comprises at least two superimposed fabrics having different size mesh openings.
  • it comprises at least three superimposed fabrics having openings of progressive mesh, the fabric with the largest mesh openings says first fabric, being crossed first by the gases.
  • the aforementioned first fabric has a diameter of wavy and straight threads greater than 0.5 mm and a nominal opening greater than 400 ⁇ m, while the latter fabric has a nominal opening of less than 200 ⁇ m.
  • the invention also relates to an arc extinguishing chamber in particular for low-voltage multipole circuit breaker with insulated molded case, comprising per pole: one pair of fixed and movable separable contacts, a contact actuation mechanism mobile, metal sheets for cooling the arc drawn between said contacts during their separation, a cut-off gas exhaust port in the housing at the exit from said chamber and a deionization device according to any one of previous claims arranged in the vicinity of said exhaust port for cooling the breaking gases leaving towards the outside environment.
  • this room also comprises at least one screen additional perforated in insulating material, placed between the ends of the above cooling and porous screen.
  • this chamber also comprises, perforated sheets or stiffeners placed on either side of the porous screen in order to increase its resistance mechanical to the pressure wave.
  • Figures 9, 10 and 11 are partial views, in section, illustrating two meshes triangular associated respectively with a reps fabric of plain chain, with a reps fabric of crossed chain and a reps fabric of solid chain with high porosity.
  • FIG 1 we see a low-voltage multipole circuit breaker Dr with housing made of material molded insulation and manual control handle.
  • This Dr circuit breaker comprises by pole an arc extinguishing chamber 1 housed in a lower compartment of the housing B.
  • Each arc extinguishing chamber 1 includes a pair of separable contacts 2, 3 and a stack of V-shaped notched cooling sheets 4 extending transversely to the direction of extension of the arc drawn between contacts 2, 3 when they separate after tripping of the circuit breaker.
  • the fixed contact 2 is supported by a shaped conductor 5 U-shaped pin, positioned on an intermediate wall 6 of the housing B and in connection electric with an external connection area 7.
  • a shielding element 8 metal is inserted between the two branches of the conductor pin 5 and has a extension 9 playing the role of end separator.
  • the movable contact 3 is integral with a contact arm 10 associated with a pivoting bar of the actuating mechanism (not shown) common to all poles.
  • a connecting braid 11 connects the opposite end from arm 10 to the thermal and electromagnetic triggers (not shown) of each pole.
  • the transverse face of the lower compartment of the housing B is provided with a cut-off gas exhaust port 12 at the outlet of each chamber arc extinction 1.
  • a gas deionization device designated by the general reference R, is arranged in each exhaust port 12 to reduce the manifestations of the ionized gases thanks to efficient cooling of the hot gases at the outlet of chamber 1.
  • Each deionization device R cooperates with the sheets 4 and includes a porous screen E formed by the juxtaposition of several metallic fabrics called reps T.
  • These reps T fabrics are generally formed by an intertwining of straight threads 15 spaced and parallel to each other with tightly knit corrugated wires 16 passing alternately above and below one or more of the successive straight wires 15, in extending substantially perpendicular to said straight wires 15.
  • rep T fabrics can have different structures, for example a structure united reps or a cross rep structure.
  • the united reps structure represented on the Figures 2, 4 and 6, the fabric T is formed of parallel straight threads 15 and wavy threads 16 passing alternately above and below successive straight wires 15, one at a time, and each times, with offset of a straight wire 15 with respect to the preceding wavy wire, that is to say that two adjacent wavy wires 16 pass respectively above and below the same wire right 15.
  • each fabric T is formed of straight wires 15 and corrugated wires 16, each corrugated wire 16 passing alternately through above and below two straight wires 15 both with offset of a straight wire 15 by compared to the preceding corrugated wire, the corrugated wires 16 being nested.
  • the parameters defining these structures are inter alia the diameters of the straight wires 15 and corrugated 16, the spacing (or not) of the straight wires 15, the nominal or empty opening of mesh, which corresponds, as illustrated in Figures 9, 10, 11 to the diameter of the sphere S tangent to the wires 16a, 16b forming the mesh.
  • the diameter d of the wires corrugated 16 will be less than the diameter D of the straight wires 15. This weaving makes it possible to obtain mesh openings significantly smaller than the diameter d, D of the constituent wires 15, 16 some cobweb.
  • the porous screen E is constituted by several fabrics T as described previously, stacked on top of each other (advantageously, between 2 and 5 fabrics). These juxtaposed fabrics T have progressive mesh openings, fabric T having the openings the most important, i.e. with the largest wire diameter, being located so as to be crossed first by the gases. So this first fabric has a significant thermomechanical robustness, necessary for the first gas filtering element while the latter will have the minimum mesh opening required for maximum cooling of the breaking gases.
  • the diameters d, D of threads (wavy and straight) associated with the first fabric will be greater than 0.5 mm and the opening nominal greater than 400 ⁇ m, while the nominal mesh opening associated with the last tissue will be less than 200 ⁇ m.
  • an additional screen 17 of insulating material will advantageously placed in the exhaust zone of the arc extinguishing chamber 1, in the gap between the ends of the sheets 4 and the porous screen E according to the invention.
  • This insulating screen 17 disposed opposite the porous screen E has a perforation regular and perfectly defined allowing gas circulation. This screen 17 is intended to prevent the arc from looping back on the metal elements of the filter.
  • perforated sheets or stiffeners may be added on both sides of the porous screen E. These perforated sheets will allow stir the gas and increase the mechanical strength of the assembly in order to resist the pressure wave associated with breaking short-circuit currents.
  • the ionized gases cross the meshes M formed in the different layers of fabric, each mesh M being defined as more particularly visible in FIGS. 9 to 11, whatever the structure of the fabric, united reps or crossed reps, by a straight thread 15 and two threads wavy 16 tangents to each other in the median p plane of the fabric.
  • the ionized gas flows at through these passages of minimum section being strongly disturbed in terms of direction and speed.
  • Figures 7 and 8 to observe the gas path respectively in a plain reps fabric and a crossed reps fabric.
  • the fabric T it is necessary for the fabric T to retain a certain porosity in order to allow an exit of the gases thus limiting the overpressure appearing in the device. It will therefore be necessary to find a compromise between the exhaust section and the exchange surface.
  • rep tissue may be considered such as for example, the high porosity reps fabric as illustrated in FIG. 11, in which the threads the finest 20 are of a diameter less than the diameter of the sphere S tangent to the wires forming the mesh M.
  • the material constituting the wires may be any metallic material which conducts heat and corrosion resistant such as stainless steel or nickel.
  • the number of superimposed fabrics will be adapted according to the arc energy developed in the breaking chamber. For example, for an energy of 200kj, four thicknesses will be used.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Woven Fabrics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Apparatus For Making Beverages (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Breakers (AREA)

Description

La présente invention concerne un dispositif de désionisation des gaz destiné notamment à être placé dans la zone de l'orifice d'échappement d'une chambre de coupure d'un disjoncteur multipolaire basse tension à boítier moulé, et une chambre d'extinction d'arc équipée de ce dispositif.The present invention relates to a gas deionization device intended in particular for be placed in the exhaust port area of a switch-off chamber low-voltage multipole circuit breaker with molded case, and an arc extinguishing chamber equipped of this device.

On connaít des dispositifs tels que celui décrit dans le document US 3 997 746 comprenant des grilles métalliques ou écrans à mailles fines, notamment en acier, logées dans les orifices d'échappement des chambres de coupure de disjoncteurs. Les gaz de coupure engendrés dans la chambre d'extinction lors de la coupure sortent vers le milieu extérieur après passage par les grilles jouant le rôle de pare-flammes. Or, on a constaté que ces gaz étaient encore fortement ionisés à la sortie de la chambre.We know devices such as that described in document US 3,997,746 comprising metal grids or fine mesh screens, in particular steel, housed in the exhaust ports of circuit breaker interrupting chambers. Cut-off gases generated in the extinguishing chamber during the cut out to the outside environment after passing through the grids acting as a flame arrester. However, it was found that these gases were still strongly ionized when leaving the room.

Afin d'améliorer la désionisation par refroidissement des gaz de coupure, d'autres dispositifs de désionisation ont déjà été proposés, notamment un labyrinthe formé par une pluralité d'écrans à fenêtres décalées, une grille à réflexion etc., mais l'encombrement important de ces dispositifs ne permet pas leur utilisation dans des chambres d'extinction compactes pour disjoncteurs à boítier moulés.In order to improve the deionization by cooling the cut-off gases, other deionization devices have already been proposed, in particular a labyrinth formed by a plurality of screens with offset windows, a reflection grid etc., but the bulk important of these devices does not allow their use in extinguishing chambers compact for molded case circuit breakers.

Le brevet européen EP 0 022 708 décrit un dispositif de désionisation comprenant un écran poreux formé à partir de billes agglomérées réalisées à base de cuivre. Des interstices sont ménagés entre les billes pour le passage des gaz de coupure vers le milieu extérieur. Ce dispositif, de structure compacte, permet un refroidissement relativement efficace des gaz de coupure ventilés à partir d'une chambre d'extinction à pouvoir de coupure élevé.European patent EP 0 022 708 describes a deionization device comprising a screen porous formed from agglomerated beads made from copper. Interstices are formed between the balls for the passage of the breaking gases to the outside environment. This device, of compact structure, allows relatively efficient cooling of gases cut-off ventilated from an extinguishing chamber with high breaking capacity.

La présente invention propose un dispositif de désionisation perfectionné de structure compacte, permettant d'obtenir un refroidissement encore plus efficace des gaz de coupure sortant vers le milieu extérieur, de manière à réduire les manifestations extérieures. The present invention provides an improved structure deionization device compact, allowing even more efficient cooling of the breaking gases leaving towards the external environment, so as to reduce external manifestations.

Ce dispositif est destiné à être incorporé dans une chambre d'extinction d'arc à pouvoir de coupure élevé et présente une structure adaptée en fonction de l'énergie d'arc développée dans ladite chambre.This device is intended to be incorporated in an arc extinguishing chamber capable of high cutoff and has a structure adapted to the arc energy developed in said room.

A cet effet, la présente invention a pour objet un dispositif de désionisation des gaz, comprenant un écran poreux destiné notamment à être agencé au voisinage de l'orifice d'échappement de la chambre de coupure d'un disjoncteur basse tension pour assurer le refroidissement des gaz de coupure générés lors de la séparation des contacts après déclenchement du disjoncteur, ce dispositif étant caractérisé en ce que l'écran poreux précité comporte au moins un tissu dit reps comprenant un entrecroisement de fils droits espacés et parallèles entre eux avec des fils ondulés serrés de manière jointive, lesdits fils ondulés s'étendant sensiblement perpendiculairement audits fils droits et passant alternativement au dessus et en dessous d'au moins un des fils droits successifs.To this end, the subject of the present invention is a device for deionizing gases, comprising a porous screen intended in particular to be arranged in the vicinity of the orifice exhaust from the breaking chamber of a low voltage circuit breaker to ensure cooling of the breaking gases generated during the separation of the contacts after tripping of the circuit breaker, this device being characterized in that the porous screen aforementioned comprises at least one fabric known as reps comprising an intertwining of straight threads spaced apart and parallel to each other with wavy wires tightly joined together, said wires wavy extending substantially perpendicular to said straight and passing wires alternately above and below at least one of the successive straight wires.

Selon une caractéristique particulière, le(s) tissu(s) précité(s) est (sont) réalisé(s) en un matériau métallique résistant à la corrosion tel que l'acier inoxydable ou le nickel.According to a particular characteristic, the above-mentioned fabric (s) is (are) produced in one corrosion-resistant metallic material such as stainless steel or nickel.

Selon une réalisation particulière, chaque tissu comporte des mailles de forme sensiblement triangulaire destinées au passage du gaz et définies chacune par un fil droit et deux fils ondulés tangents entre eux dans le plan médian du tissu.According to a particular embodiment, each fabric has substantially shaped meshes triangular intended for the passage of gas and each defined by a straight wire and two wires wavy tangent to each other in the median plane of the tissue.

Selon une réalisation particulière, l'un au moins des tissus précités comporte des fils ondulés passant alternativement au dessus et en dessous d'un seul fil droit à la fois, et agencés deux à deux de manière que lorsque l'un passe au dessus d'un fil droit, l'autre passe au dessous de ce même fil droit.According to a particular embodiment, at least one of the abovementioned fabrics comprises threads wavy passing alternately above and below only one straight wire at a time, and arranged in pairs so that when one passes over a straight wire, the other goes below this same straight wire.

Selon une autre réalisation particulière, l'un au moins des tissus précités comporte des fils ondulés passant alternativement en dessous et au dessus de deux fils droits à la fois, chaque fois avec décalage d'un fil droit par rapport au fil ondulé précédent, les fils ondulés étant imbriqués. According to another particular embodiment, at least one of the aforementioned fabrics comprises threads wavy passing alternately below and above two straight wires at a time, each times with offset of a straight wire compared to the previous wavy wire, the wavy wires being nested.

Avantageusement, les fils ondulés sont les fils de trame.Advantageously, the corrugated threads are the weft threads.

Selon une autre caractéristique, le diamètre des fils ondulés est inférieur à celui des fils droits.According to another characteristic, the diameter of the corrugated wires is smaller than that of the wires rights.

Selon une autre caractéristique, il comporte au moins deux tissus superposés ayant des ouvertures de maille de taille différente.According to another characteristic, it comprises at least two superimposed fabrics having different size mesh openings.

Avantageusement, il comporte au moins trois tissus superposés ayant des ouvertures de maille progressives, le tissu présentant les plus grandes ouvertures de maille dit premier tissu, étant traversé en premier par les gaz.Advantageously, it comprises at least three superimposed fabrics having openings of progressive mesh, the fabric with the largest mesh openings says first fabric, being crossed first by the gases.

Avantageusement, le premier tissu précité présente un diamètre de fils ondulés et droits supérieurs à 0,5 mm et une ouverture nominale supérieure à 400 µm, tandis que le dernier tissu présente une ouverture nominale inférieure à 200 µm.Advantageously, the aforementioned first fabric has a diameter of wavy and straight threads greater than 0.5 mm and a nominal opening greater than 400 µm, while the latter fabric has a nominal opening of less than 200 µm.

L'invention a également pour objet une chambre d'extinction d'arc notamment pour disjoncteur multipolaire basse tension à boítier moulé isolant, comprenant par pôle : une paire de contacts séparables fixe et mobile, un mécanisme d'actionnement du contact mobile, des tôles métalliques de refroidissement de l'arc tiré entre lesdits contacts lors de leur séparation, un orifice d'échappement des gaz de coupure ménagé dans le boítier à la sortie de ladite chambre et un dispositif de désionisation selon l'une quelconque des revendications précédentes agencé au voisinage dudit orifice d'échappement pour refroidir les gaz de coupure sortant vers le milieu extérieur.The invention also relates to an arc extinguishing chamber in particular for low-voltage multipole circuit breaker with insulated molded case, comprising per pole: one pair of fixed and movable separable contacts, a contact actuation mechanism mobile, metal sheets for cooling the arc drawn between said contacts during their separation, a cut-off gas exhaust port in the housing at the exit from said chamber and a deionization device according to any one of previous claims arranged in the vicinity of said exhaust port for cooling the breaking gases leaving towards the outside environment.

Selon une caractéristique particulière, cette chambre comporte en outre au moins un écran additionnel perforé en matériau isolant, placé entre les extrémités des tôles de refroidissement précitées et l'écran poreux. According to a particular characteristic, this room also comprises at least one screen additional perforated in insulating material, placed between the ends of the above cooling and porous screen.

Selon une autre caractéristique, cette chambre comporte en outre, des tôles perforées ou raidisseurs placés de part et d'autre de l'écran poreux afin d'augmenter sa résistance mécanique à l'onde de pression.According to another characteristic, this chamber also comprises, perforated sheets or stiffeners placed on either side of the porous screen in order to increase its resistance mechanical to the pressure wave.

Mais d'autres avantages et caractéristiques de l'invention apparaítront mieux dans la description détaillée qui suit et se réfère aux dessins annexés donnés uniquement à titre d'exemples et dans lesquels :

  • La figure 1 est une vue en coupe longitudinale d'une chambre d'extinction d'arc selon l'invention appartenant à un disjoncteur à boítier moulé représenté partiellement arraché.
  • Les figures 2, 2a et 2b illustrent respectivement une vue de dessus, une vue en coupe et une vue de côté, d'un tissu dit reps de trame selon une réalisation particulière de l'invention.
  • Les figures 3, 3a, et 3b illustrent respectivement une vue de dessus, une vue en coupe et une vue de côté d'un tissu dit reps croisé de trame, selon une autre réalisation de l'invention.
  • Les figures 4, 4a et 4b illustrent respectivement une vue de dessus, une vue en coupe et une vue de côté d'un tissu dit reps uni de chaíne, selon une autre réalisation de l'invention.
  • Les figures 5, 5a et 5b illustrent respectivement une vue de dessus, une vue en coupe et une vue de côté d'un tissu dit reps de chaíne croisé, selon une autre réalisation de l'invention.
  • La figure 6 est une vue schématique partielle et en perspective, illustrant un fil de trame droit et deux fils de chaínes ondulés adjacents, d'un tissu reps uni.
  • Les figures 7 et 8 illustrent schématiquement le trajet du gaz à travers respectivement deux tissus reps superposés, et quatre tissus reps superposés.
However, other advantages and characteristics of the invention will appear better in the detailed description which follows and refers to the appended drawings given solely by way of examples and in which:
  • Figure 1 is a longitudinal sectional view of an arc extinguishing chamber according to the invention belonging to a molded case circuit breaker shown partially cut away.
  • Figures 2, 2a and 2b respectively illustrate a top view, a sectional view and a side view of a fabric known as weft reps according to a particular embodiment of the invention.
  • Figures 3, 3a, and 3b respectively illustrate a top view, a sectional view and a side view of a fabric known as weft cross reps, according to another embodiment of the invention.
  • Figures 4, 4a and 4b respectively illustrate a top view, a sectional view and a side view of a fabric called reps plain chain, according to another embodiment of the invention.
  • Figures 5, 5a and 5b respectively illustrate a top view, a sectional view and a side view of a fabric called reps of crossed chain, according to another embodiment of the invention.
  • Figure 6 is a partial schematic view in perspective, illustrating a straight weft thread and two adjacent wavy warp threads, of a single reps fabric.
  • Figures 7 and 8 schematically illustrate the path of the gas through respectively two superposed reps fabrics, and four superposed reps fabrics.

Les figures 9, 10 et 11 sont des vues partielles, en coupe, illustrant deux mailles triangulaires associées respectivement à un tissu reps de chaíne uni, à un tissu reps de chaíne croisé et à un tissu reps de chaíne uni à forte porosité.Figures 9, 10 and 11 are partial views, in section, illustrating two meshes triangular associated respectively with a reps fabric of plain chain, with a reps fabric of crossed chain and a reps fabric of solid chain with high porosity.

Sur la figure 1, on voit un disjoncteur Dr basse tension multipolaire à boítier en matériau isolant moulé et à manette de commande manuelle. Ce disjoncteur Dr comporte par pôle une chambre d'extinction d'arc 1 logée dans un compartiment inférieur du boítier B.In Figure 1, we see a low-voltage multipole circuit breaker Dr with housing made of material molded insulation and manual control handle. This Dr circuit breaker comprises by pole an arc extinguishing chamber 1 housed in a lower compartment of the housing B.

Chaque chambre d'extinction d'arc 1 comprend une paire de contacts 2, 3 séparables et un empilage de tôles 4 de refroidissement encochées en V, s'étendant transversalement à la direction d'extension de l'arc tiré entre les contacts 2, 3 lors de leur séparation après déclenchement du disjoncteur. Le contact fixe 2 est supporté par un conducteur 5 en forme d'épingle en U, positionnée sur une paroi 6 intermédiaire du boítier B et en liaison électrique avec une plage 7 extérieure de raccordement. Un élément de blindage 8 métallique est inséré entre les deux branches de l'épingle du conducteur 5 et est doté d'une extension 9 jouant le rôle de séparateur d'extrémité. Le contact mobile 3 est solidaire d'un bras de contact 10 associé à un barreau pivotant du mécanisme d'actionnement (non représenté) commun à tous les pôles. Une tresse 11 de liaison connecte l'extrémité opposée du bras 10 aux éléments déclencheurs thermique et électromagnétique (non représentés) de chaque pôle. La face transversale du compartiment inférieur du boítier B est munie d'un orifice 12 d'échappement des gaz de coupure ménagé à la sortie de chaque chambre d'extinction d'arc 1.Each arc extinguishing chamber 1 includes a pair of separable contacts 2, 3 and a stack of V-shaped notched cooling sheets 4 extending transversely to the direction of extension of the arc drawn between contacts 2, 3 when they separate after tripping of the circuit breaker. The fixed contact 2 is supported by a shaped conductor 5 U-shaped pin, positioned on an intermediate wall 6 of the housing B and in connection electric with an external connection area 7. A shielding element 8 metal is inserted between the two branches of the conductor pin 5 and has a extension 9 playing the role of end separator. The movable contact 3 is integral with a contact arm 10 associated with a pivoting bar of the actuating mechanism (not shown) common to all poles. A connecting braid 11 connects the opposite end from arm 10 to the thermal and electromagnetic triggers (not shown) of each pole. The transverse face of the lower compartment of the housing B is provided with a cut-off gas exhaust port 12 at the outlet of each chamber arc extinction 1.

Selon l'invention, un dispositif de désionisation des gaz, désigné par le repère général R, est disposé dans chaque orifice d'échappement 12 pour diminuer les manifestations extérieures des gaz ionisés grâce à un refroidissement efficace des gaz chauds à la sortie de la chambre 1. Chaque dispositif de désionisation R coopère avec les tôles 4 et comporte un écran poreux E formé par la juxtaposition de plusieurs tissus métalliques dits reps T. According to the invention, a gas deionization device, designated by the general reference R, is arranged in each exhaust port 12 to reduce the manifestations of the ionized gases thanks to efficient cooling of the hot gases at the outlet of chamber 1. Each deionization device R cooperates with the sheets 4 and includes a porous screen E formed by the juxtaposition of several metallic fabrics called reps T.

Ces tissus reps T sont constitués de façon générale par un entrecroisement de fils droits 15 espacés et parallèles entre eux avec des fils ondulés serrés jointifs 16 passant alternativement au dessus et au dessous d'un ou plusieurs des fils droits successifs 15, en s'étendant sensiblement perpendiculairement audits fils droits 15.These reps T fabrics are generally formed by an intertwining of straight threads 15 spaced and parallel to each other with tightly knit corrugated wires 16 passing alternately above and below one or more of the successive straight wires 15, in extending substantially perpendicular to said straight wires 15.

Ces tissus reps T peuvent avoir différentes structures à savoir par exemple une structure reps unie ou une structure reps croisée. Selon la structure reps unie, représentée sur les figures 2, 4 et 6, le tissu T est formé de fils droits parallèles 15 et de fils ondulés 16 passant alternativement au dessus et en dessous des fils droits successifs 15, un à la fois, et chaque fois, avec décalage d'un fil droit 15 par rapport au fil ondulé précédent, c'est à dire que deux fils ondulés adjacents 16 passent respectivement au dessus et en dessous du même fil droit 15.These rep T fabrics can have different structures, for example a structure united reps or a cross rep structure. According to the united reps structure, represented on the Figures 2, 4 and 6, the fabric T is formed of parallel straight threads 15 and wavy threads 16 passing alternately above and below successive straight wires 15, one at a time, and each times, with offset of a straight wire 15 with respect to the preceding wavy wire, that is to say that two adjacent wavy wires 16 pass respectively above and below the same wire right 15.

Selon la structure reps croisée, telle qu'illustrée sur les figures 3 et 5, chaque tissu T est formé de fils droits 15 et de fils ondulés 16, chaque fil ondulé 16 passant alternativement au dessus et en dessous de deux fils droits 15 à la fois avec décalage d'un fil droit 15 par rapport au fil ondulé précédent, les fils ondulés 16 étant imbriqués.According to the cross rep structure, as illustrated in FIGS. 3 and 5, each fabric T is formed of straight wires 15 and corrugated wires 16, each corrugated wire 16 passing alternately through above and below two straight wires 15 both with offset of a straight wire 15 by compared to the preceding corrugated wire, the corrugated wires 16 being nested.

Les paramètres définissant ces structures sont entre autres les diamètres des fils droits 15 et ondulés 16, l'espacement (ou pas) des fils droits 15, l'ouverture nominale ou vide de maille, laquelle correspond, tel qu'illustré sur les figures 9, 10, 11 au diamètre de la sphère S tangente aux fils 16a, 16b formant la maille. Avantageusement, le diamètre d des fils ondulés 16 sera inférieur au diamètre D des fils droits 15. Ce tissage permet d'obtenir des ouvertures de mailles nettement plus petites que le diamètre d, D des fils 15, 16 constitutifs de la toile.The parameters defining these structures are inter alia the diameters of the straight wires 15 and corrugated 16, the spacing (or not) of the straight wires 15, the nominal or empty opening of mesh, which corresponds, as illustrated in Figures 9, 10, 11 to the diameter of the sphere S tangent to the wires 16a, 16b forming the mesh. Advantageously, the diameter d of the wires corrugated 16 will be less than the diameter D of the straight wires 15. This weaving makes it possible to obtain mesh openings significantly smaller than the diameter d, D of the constituent wires 15, 16 some cobweb.

Avantageusement, l'écran poreux E est constitué par plusieurs tissus T tels que décrits précédemment, empilés les uns sur les autres (avantageusement, entre 2 et 5 tissus). Ces tissus juxtaposés T ont des ouvertures de maille progressives, le tissu T ayant les ouvertures les plus importantes, c'est à dire dont le diamètre des fils est le plus important, étant situé de manière à être traversé en premier par les gaz. Ainsi, ce premier tissu présente une robustesse thermomécanique importante, nécessaire pour le premier élément filtrant les gaz de coupure, tandis que le dernier présentera une ouverture de maille minimale nécessaire pour un refroidissement maximal des gaz de coupure. A cet effet, les diamètres d, D des fils (ondulés et droits) associés au premier tissu seront supérieurs à 0,5 mm et l'ouverture nominale supérieure à 400µm, tandis que l'ouverture de maille nominale associée au dernier tissu sera inférieur à 200 µm.Advantageously, the porous screen E is constituted by several fabrics T as described previously, stacked on top of each other (advantageously, between 2 and 5 fabrics). These juxtaposed fabrics T have progressive mesh openings, fabric T having the openings the most important, i.e. with the largest wire diameter, being located so as to be crossed first by the gases. So this first fabric has a significant thermomechanical robustness, necessary for the first gas filtering element while the latter will have the minimum mesh opening required for maximum cooling of the breaking gases. For this purpose, the diameters d, D of threads (wavy and straight) associated with the first fabric will be greater than 0.5 mm and the opening nominal greater than 400µm, while the nominal mesh opening associated with the last tissue will be less than 200 µm.

En outre, on notera que la diminution progressive des ouvertures nominales apporte une meilleure maítrise de la montée en pression dans la chambre d'extinction d'arc.In addition, it should be noted that the gradual reduction in nominal openings brings a better control of the pressure build-up in the arc extinguishing chamber.

En se reportant à la figure 1, on voit qu'un écran additionnel 17 en matériau isolant, sera avantageusement placé dans la zone d'échappement de la chambre d'extinction d'arc 1, dans l'intervalle ménagé entre les extrémités des tôles 4 et l'écran poreux E selon l'invention.Referring to Figure 1, we see that an additional screen 17 of insulating material, will advantageously placed in the exhaust zone of the arc extinguishing chamber 1, in the gap between the ends of the sheets 4 and the porous screen E according to the invention.

Cet écran isolant 17 disposé en regard de l'écran poreux E présente une perforation régulière et parfaitement définie permettant une circulation des gaz. Cet écran 17 est destiné à empêcher l'arc de reboucler sur les éléments métalliques du filtre.This insulating screen 17 disposed opposite the porous screen E has a perforation regular and perfectly defined allowing gas circulation. This screen 17 is intended to prevent the arc from looping back on the metal elements of the filter.

On notera également que des tôles perforées ou des raidisseurs (non représentés) pourront être ajoutés de part et d'autre de l'écran poreux E. Ces tôles perforées permettront de réaliser un brassage du gaz et augmenteront la tenue mécanique de l'ensemble afin de résister à l'onde de pression associée à la coupure des courants de court-circuit.It will also be noted that perforated sheets or stiffeners (not shown) may be added on both sides of the porous screen E. These perforated sheets will allow stir the gas and increase the mechanical strength of the assembly in order to resist the pressure wave associated with breaking short-circuit currents.

Ainsi, en fonctionnement, lors de la coupure de l'arc dans la chambre d'extinction 1 les gaz de coupure, après passage à travers l'écran isolant 17 sont refroidis efficacement à travers l'écran poreux E.Thus, in operation, when the arc is cut in the extinguishing chamber 1, the gases , after passage through the insulating screen 17 are effectively cooled through the porous screen E.

En effet, les gaz ionisés traversent les mailles M formées dans les différentes couches de tissu, chaque maille M étant définie comme plus particulièrement visible sur les figures 9 à 11, quelque soit la structure du tissu, reps uni ou reps croisé, par un fil droit 15 et deux fils ondulés 16 tangents entre eux dans le plan p médian du tissu. Le gaz ionisé s'écoule à travers ces passages de section minimum en étant fortement perturbé en terme de direction et de vitesse. On se reportera aux figures 7 et 8 pour observer le trajet du gaz respectivement dans un tissu reps uni et un tissu reps croisé. Ainsi sont favorisés les échanges thermiques entre les gaz et les fils 15, 16 constituant l'écran E et donc leur désionisation par refroidissement. On notera qu'il est nécessaire que le tissu T conserve une certaine porosité afin de permettre une sortie des gaz limitant ainsi la surpression apparaissant dans l'appareil. Il sera donc nécessaire de trouver un compromis entre la section d'échappement et la surface d'échange.Indeed, the ionized gases cross the meshes M formed in the different layers of fabric, each mesh M being defined as more particularly visible in FIGS. 9 to 11, whatever the structure of the fabric, united reps or crossed reps, by a straight thread 15 and two threads wavy 16 tangents to each other in the median p plane of the fabric. The ionized gas flows at through these passages of minimum section being strongly disturbed in terms of direction and speed. Refer to Figures 7 and 8 to observe the gas path respectively in a plain reps fabric and a crossed reps fabric. Thus are favored heat exchanges between the gases and the wires 15, 16 constituting the screen E and therefore their deionization by cooling. It will be noted that it is necessary for the fabric T to retain a certain porosity in order to allow an exit of the gases thus limiting the overpressure appearing in the device. It will therefore be necessary to find a compromise between the exhaust section and the exchange surface.

Par rapport aux tissus métalliques traditionnels à maille carrée, ces tissus permettent d'obtenir des ouvertures de mailles nettement plus fines que le diamètre des fils du tissu. Il est alors possible de combiner dans un même filtre une bonne tenue thermomécanique et une grande surface d'échange nécessaire au refroidissement.Compared to traditional metallic square mesh fabrics, these fabrics allow to obtain mesh openings clearly thinner than the diameter of the threads of the fabric. he it is then possible to combine in the same filter good thermomechanical resistance and a large exchange surface necessary for cooling.

On notera que des structures particulières de tissu reps pourront être envisagées telles que par exemple, le tissu reps à forte porosité tel qu'illustré sur la figure 11, dans lequel les fils les plus fins 20 sont d'un diamètre inférieur au diamètre de la sphère S tangente aux fils formant la maille M.It will be noted that particular structures of rep tissue may be considered such as for example, the high porosity reps fabric as illustrated in FIG. 11, in which the threads the finest 20 are of a diameter less than the diameter of the sphere S tangent to the wires forming the mesh M.

Le matériau constituant les fils pourra être tout matériau métallique conduisant la chaleur et résistant à la corrosion tel que l'acier inoxydable ou bien le nickel.The material constituting the wires may be any metallic material which conducts heat and corrosion resistant such as stainless steel or nickel.

Le nombre de tissus superposés sera adapté en fonction de l'énergie d'arc développée dans la chambre de coupure. Par exemple, pour une énergie de 200kj, quatre épaisseurs seront utilisées.The number of superimposed fabrics will be adapted according to the arc energy developed in the breaking chamber. For example, for an energy of 200kj, four thicknesses will be used.

Claims (13)

  1. A gas deionization device comprising a porous shield designed in particular to be arranged near to the outlet orifice of the arc extinguishing chamber of a low voltage circuit breaker to perform cooling of the breaking gases generated when separation of the contacts takes place after tripping of the circuit breaker,
    characterized in that the above-mentioned porous shield (E) comprises at least one cloth called reps (T) comprising a criss-cross texture of straight wire yarns (15) spaced apart from and parallel to one another with tight joined undulated wire yarns (16), said undulated wire yarns (16) extending appreciably perpendicularly to said straight wire yarns (15) and passing alternately over and under at least one of the successive straight wire yarns (15).
  2. The device according to claim 1, characterized in that the above-mentioned cloth(s) (T) is(are) made of a corrosion-resistant metallic material such as stainless steel or nickel.
  3. The device according to claim 1 or 2, characterized in that each cloth (T) comprises meshes M of appreciably triangular shape designed for passage of the gas and each defined by a straight wire yarn (15) and two undulated wire yarns (16) tangent to one another in the mid-plane p of the cloth (T).
  4. The device according to any one of the foregoing claims, characterized in that at least one of the above-mentioned cloths (T) comprises undulated wire yarns (16) passing alternately over and under a single straight wire yarn (15) at a time, and arranged two by two so that when one passes over a straight wire yarn (15), the other passes under this same straight wire yarn (15).
  5. The device according to any one of the claims 1 to 3, characterized in that at least one of the above-mentioned cloths (T) comprises undulated wire yarns (16) passing alternately under and over two straight wire yarns (15) at a time, each time with an offset of a straight wire yarn (15) with respect to the previous undulated wire yarn (16), the undulated wire yarns (16) being interlaced.
  6. The device according to any one of the foregoing claims, characterized in that the undulated wire yarns (16) are the weft yarns.
  7. The device according to any one of the foregoing claims, characterized in that the diameter of the undulated wire yarns (16) is smaller than that of the straight wire yarns (15).
  8. The device according to any one of the foregoing claims, characterized in that it comprises at least two superposed cloths (T) having mesh openings of different size.
  9. The device according to any one of the foregoing claims, characterized in that it comprises at least three superposed cloths (T) having progressive mesh openings, the cloth (T) presenting the largest mesh openings, called the first cloth, being passed through first by the gases.
  10. The device according to claim 9, characterized in that the above-mentioned first cloth (T) presents a diameter (d) of undulated yarns (16) and straight yarns (15) greater than 0.5 mm and a nominal opening greater than 400 µm, whereas the last cloth presents a nominal opening smaller than 200 µm.
  11. An arc extinguishing chamber in particular for a multipole low voltage isolating moulded case circuit breaker, comprising per pole : a pair of stationary and movable separable contacts (2, 3), an actuating mechanism of the movable contact (2), metal plates (4) for cooling of the arc drawn between said contacts (2, 3) when separation of the latter takes place, an orifice (12) for outlet of the breaking gases arranged in the case (B) at the outlet of said chamber (1), characterized in that it comprises in addition a deionization device (R) according to any one of the foregoing claims arranged near to said outlet orifice (12) to cool the breaking gases outlet to the outside environment.
  12. The arc extinguishing chamber according to claim 11, characterized in that it comprises in addition at least one additional perforated shield (17) made of insulating material placed between the ends of the above-mentioned cooling plates (4) and the porous shield (E).
  13. The arc extinguishing chamber according to claim 11 or 12, characterized in that said chamber (1) comprises in addition perforated plates or stiffeners placed on each side of the porous shield (E) to increase its mechanical resistance to the pressure wave.
EP97410062A 1996-06-28 1997-06-13 Deionization device for gases, particularly for cut off gases in an arc extinguishing chamber of a low tension molded case circuit breaker and arc extinguishing chamber equipped with such a device Expired - Lifetime EP0817223B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9608301A FR2750531B1 (en) 1996-06-28 1996-06-28 GAS DEIONIZATION DEVICE IN PARTICULAR CUTTING GASES IN AN ARC EXTINGUISHING CHAMBER OF A LOW VOLTAGE CIRCUIT BREAKER WITH MOLDED BOX AND ARC EXTINGUISHING CHAMBER EQUIPPED WITH THIS DEVICE
FR9608301 1996-06-28

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EP0817223A1 EP0817223A1 (en) 1998-01-07
EP0817223B1 true EP0817223B1 (en) 2002-05-08

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US (1) US5889249A (en)
EP (1) EP0817223B1 (en)
KR (1) KR100441805B1 (en)
CN (1) CN1072832C (en)
DE (1) DE69712413T2 (en)
EA (1) EA000443B1 (en)
ES (1) ES2176649T3 (en)
FR (1) FR2750531B1 (en)

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US9761392B2 (en) 2013-03-06 2017-09-12 Eaton Electrical Ip Gmbh & Co. Kg Plate stack for a cooling device in installation devices
WO2015067462A1 (en) 2013-11-07 2015-05-14 Eaton Electrical Ip Gmbh & Co. Kg Method for producing plate arrangements and use thereof
CN106796851A (en) * 2014-11-06 2017-05-31 伊顿电气Ip两合公司 The system that component and particle capture component are cooled down including switching gas
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CN106876197A (en) * 2015-12-10 2017-06-20 施耐德电器工业公司 The multipole air partition breaker of the device for filtering quenching gas including improving
CN106876197B (en) * 2015-12-10 2019-11-15 施耐德电器工业公司 The multipole air partition breaker of the device of filtering quenching gas including improvement
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KR980005116A (en) 1998-03-30
DE69712413D1 (en) 2002-06-13
EP0817223A1 (en) 1998-01-07
CN1072832C (en) 2001-10-10
DE69712413T2 (en) 2002-11-21
ES2176649T3 (en) 2002-12-01
FR2750531A1 (en) 1998-01-02
EA199700069A1 (en) 1997-12-30
KR100441805B1 (en) 2004-11-03
EA000443B1 (en) 1999-08-26
US5889249A (en) 1999-03-30
CN1169581A (en) 1998-01-07
FR2750531B1 (en) 1998-08-07

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