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WO2015091344A1 - Control valve with moulded packing gland comprising a flash located in a recess - Google Patents

Control valve with moulded packing gland comprising a flash located in a recess Download PDF

Info

Publication number
WO2015091344A1
WO2015091344A1 PCT/EP2014/077738 EP2014077738W WO2015091344A1 WO 2015091344 A1 WO2015091344 A1 WO 2015091344A1 EP 2014077738 W EP2014077738 W EP 2014077738W WO 2015091344 A1 WO2015091344 A1 WO 2015091344A1
Authority
WO
WIPO (PCT)
Prior art keywords
segment
valve
plug
angular
mold
Prior art date
Application number
PCT/EP2014/077738
Other languages
French (fr)
Inventor
Emmanuel Talon
Benoît MAURICE
Marc Thabourey
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2015091344A1 publication Critical patent/WO2015091344A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/072—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members
    • F16K11/076—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members with sealing faces shaped as surfaces of solids of revolution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
    • F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/0407—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F16K5/045—Particular coverings and materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0036—Submerged or recessed burrs

Definitions

  • the invention relates to a control valve for a fluid circulation circuit, in particular for a cooling circuit of a motor vehicle engine.
  • control valve for a fluid circulation circuit, comprising a valve body in a fixing face from which opens a blind axial bore having a bottom wall and a peripheral wall in which at least two open lateral openings.
  • Said bore receives an axially rotating plug adapted to occupy at least two angular positions to open / close said lateral orifices according to its angular position to allow / interrupt the distribution of the fluid through said lateral orifices, said plug having a rotary mounted axial hub. on an axial shaft extending from the bottom wall of the bore.
  • a generally angular portion of cylindrical envelope sealing segment coaxially surrounds the hub which it is integral in rotation.
  • the bore opens out of the valve body via an axial orifice which usually constitutes an inlet for the fluid, while the lateral orifices constitute outlet channels for the fluid, the distribution of the fluid through the output channels being controlled according to the angular position taken by the plug.
  • This known control valve finds a particular application in the cooling circuits of motor vehicle thermal engines.
  • the axial orifice, forming a fluid inlet is connected to a cooling fluid inlet coming from the heat engine, while the three orifices side, forming fluid outlet, are respectively connected to three branches of the circuit.
  • This circuit comprises for example a first branch which contains a cooling radiator of the engine, a second branch which constitutes a bypass of the cooling radiator and a third branch which contains a heater for heating the passenger compartment.
  • control valve described in the application WO-A1-2005/124205 comprises a plug having a hub surrounded by a sealing segment in the form of an angular section of cylindrical envelope which is also integral in rotation with said hub.
  • the sealing segment of the valve according to the invention is produced by molding, in particular by injection of a plastic material. Many injection configurations have been experimented.
  • An injection into a two-shell mold having an axial joint plane makes it possible to obtain a segment free of deformations, in particular by the use of an undercut core.
  • the joint plane is arranged in an axial plane, at least one parallel burr parallel to the axial direction is formed at the periphery of the segment during molding. This burr, whose thickness is not negligible, tends to take off the segment of the wall of the bore of the valve, thus causing undesirable leaks.
  • the invention overcomes this disadvantage by proposing a control valve for a fluid circulation circuit, comprising a valve body receiving an axially rotating plug, said plug having a generally angular portion of cylindrical sealing portion of cylindrical envelope able to open / close sealing of the lateral ports of the valve body according to the angular position of the plug to allow / interrupt the distribution of the fluid through said lateral orifices.
  • said sealing segment comprises a zone arranged radially away from the cylindrical envelope and comprising at least one axial burr resulting from the molding of the segment.
  • the zone arranged behind the cylindrical envelope is shaped like a flat
  • said segment comprises a first angular portion, said active, able to open / close in a sealed manner the lateral orifices of the body of the valve as a function of the angular position of the plug to allow / interrupt the distribution of the fluid through said lateral orifices; a second angular portion, said inactive, which is arranged outside the first active angular portion,
  • said inactive portion comprises said zone arranged radially recessed from the cylindrical envelope, which further improves the sealing provided by the plug by moving the burr away from the part of the plug contributing to the opening / closing of the lateral orifices of the valve ,
  • the segment extends over 180 ° and the burr is arranged at 180 ° of a free end edge of the segment, which allows to have a segment of wide angular extent while remaining compatible with the directions demolding that involves the axial burr,
  • said active portion extends 180 ° or less than 180 ° from said edge
  • said segment is produced by injection molding of a plastic material.
  • said plastic material comprises PTFE
  • said plug further comprises a spring-shaped rod interposed between two free angular ends of the segment to exert an elastic return force transversely between said free ends in order to deform said segment radially outwards to ensure a plating of said sealing segment against the wall of the bore,
  • said ring has substantially the shape of a U having a transverse branch on either side of which are arranged two parallel vertical branches which are displaced in spacing by the transverse branch,
  • said gutters extend along the two edges of free ends of said sealing segment, in particular in the thickness thereof,
  • said valve body comprises an attachment face into which a blind axial bore opens out, comprising a bottom wall and a peripheral wall,
  • said plug is housed in said bore
  • said lateral orifices are formed on said peripheral wall
  • said plug comprises an axial hub rotatably mounted on an axial shaft which extends from the bottom wall of the bore,
  • the invention also relates to a mold for the injection molding of a cylindrical portion angular portion sealing portion for a control valve for a fluid circulation circuit, such as that described above.
  • said mold comprises at least two external shells respectively comprising two substantially complementary axial cavities allowing the molding of said segment, said shells respectively comprising facing faces assembled in an axially oriented joint plane, said indentations jointly determining a zone arranged radially recessed from the cylindrical envelope at said joint plane.
  • said imprints are semi-cylindrical
  • one of the said indentations determines the first active angular portion of the plug, the said indentations jointly determine the second inactive angular portion of the plug, the shells comprise at their junction flattened portions arranged in the extension of one another which determine said zone arranged in recess,
  • said mold comprises at least one internal axial core of which a first substantially cylindrical section internally determines the segment
  • said mold comprises a single core whose first substantially cylindrical section extends along a whole length of the fingerprints of the shells,
  • each shell has an imprint which is closed at one end by a wall which is intended to fit with a complementary wall of the opposite shell and with an end face of the first substantially cylindrical section of the core, and which opens on the side opposed in a cavity which is intended to receive a complementary portion of a second immobilization section of the core in the mold.
  • FIG. 1 is an exploded perspective view of a rotary valve
  • FIG. 2 is a perspective view of a segment for the valve of FIG. 1;
  • FIGS. 3A and 3B are diagrammatic views of molds for producing the segment for the valve of FIG. 1;
  • Figure 4 is a schematic axial sectional view of the segment obtained with the mold of Figure 3A;
  • FIGS. 5A and 5B are diagrammatic views illustrating mold variants for producing a segment for a rotary valve;
  • FIG. 6 is a diagrammatic cross-sectional view of the mold of FIGS. 5A and
  • FIG. 7 is a perspective view of a segment for a valve according to the invention
  • FIG. 8 is a cross-sectional view of the segment of FIG. 7.
  • like reference numerals designate like parts or having similar functions.
  • FIG. 1 shows a control valve 10 for a fluid circulation circuit, in particular a coolant circulation circuit of a motor vehicle.
  • Such a valve 10 is for example intended to be attached to an engine block of a vehicle, and to be connected to different bodies of the vehicle requiring a supply of coolant.
  • the valve 10 comprises a valve body 12 having a fixing face 14 on the associated engine block (not shown) of the vehicle.
  • the face 14 is for example a rectified face.
  • a blind axial bore 16 of the body 12 opens into the face 14.
  • the bore 16 comprises a peripheral wall 20 into which open at least two side ports (not shown) associated with valve conduits connected to different members of the vehicle.
  • the ducts 22, 24 may, in a non-limiting manner of the invention, be associated with an engine cooling radiator, a bypass of the cooling radiator, or a heater for heating the passenger compartment of the vehicle.
  • the bypass route may include other heat exchangers.
  • the bore 16 receives a plug 26 mounted axially rotatable about an axial direction "A".
  • the plug 26 is rotatably mounted around a fixed axial shaft 27 which extends from a bottom wall (not shown) of the bore 20.
  • This plug 26 is able to occupy at least two angular positions to open / close the lateral orifices to allow / interrupt the distribution of the fluid through said lateral orifices and consequently through the ducts 22, 24.
  • control of the angular position of the plug will be advantageously configured to allow it to occupy any desired angular positions between two end positions.
  • the plug 26 essentially comprises a hub 28 and a sealing segment 30 in the form of an angular portion of cylindrical envelope, which surrounds said hub 28 and which is rotationally integral with said hub 28.
  • the sealing segment 30 has an outer peripheral wall 36, an active part 35 of which is intended to seal with the wall 20 of the bore 16.
  • the hub 28 comprises a radial arm 32 whose end 34 is intended to be received in a complementary notch (not shown) formed on the surface of an inner periphery 38 of the segment 30.
  • Said segment thus has the shape of a sleeve, open angularly, said sleeve being connected to said radial arm 32.
  • the plug 26 advantageously comprises a rod 40 forming a spring which is interposed between the two free ends 41, 43 of said angular portion of cylindrical envelope.
  • the ring 40 is able to exert a transverse elastic return force between the free ends 41, 43 in order to deform the segment 30 radially outwards in order to ensure that said sealing segment 30 is pressed against the wall 20 of the bore 16 .
  • the rod 40 here has substantially the shape of a U having a transverse branch 42 on either side of which are arranged two parallel vertical branches 44, 46 which are fixed in receiving gutters corresponding 48, 50 of the sealing segment 30, which extend along vertical edges of the two free ends 41, 43 of the sealing segment 30.
  • Said gutters are formed, for example, in the material thickness of said rod 40.
  • the sealing between the various orifices whose opening / closing is determined by the plug 26 is conditioned by the sealing of the segment 30 in contact with the wall 20 of the bore 16.
  • the sealing segment 30 is permanently pressed against the wall 20 of the bore 16.
  • the sealing segment according to the invention is made by molding, in particular by injection of a plastic material.
  • Figure 2 shows a segment obtained after injection into a mold (not shown) without a joint plane.
  • Such a segment 30 is made in a substantially tubular mold and is extracted from the mold in the axial direction "A". This process causes significant deformation of the segment 30 in the form of an envelope portion, in particular flatness defects in the vicinity of the ends 41, 43.
  • FIG. 2 illustrates a flatness defect 52 of the order of 0.5 mm in the vicinity of the end 41. Such a defect 52 renders the segment 30 unusable.
  • Figure 3A shows such a mold.
  • the latter identified 54, comprises two shells 56, 58 intended to form an imprint 60.
  • the mold 54 determines inside the imprint 60 a plane 62 of transverse inner seal arranged substantially at half height of the imprint 60
  • the shells 56, 58 are extracted by moving them away from each other in the axial direction "A".
  • a segment 30 obtained by this method comprises a deformation 64, in particular a shrinkage or a diameter reduction, arranged substantially at mid-height of segment 30, as already indicated above.
  • a solution for avoiding a deformation of the type of the deformation 64 consists in producing the injection in a mold 54 with two shells 68, 70 having an axial joint plane 72.
  • Such a mold has been shown in FIGS. 5A and 5B , the mold of Figure 5B providing the use of an undercut to further limit such a phenomenon.
  • This method makes it possible to obtain a segment 30 free of deformations.
  • the joint plane 72 is arranged in an axial plane, at least one axially parallel burr 76 is formed in the active portion 35 at the periphery 36 of the segment 30. during molding.
  • the invention overcomes this drawback by proposing a new design of a valve comprising a segment 30 whose burr 76 resulting from the molding is arranged in an area of said segment 30 which, preferably, does not participate in its sealing with the bore 20 of the body 12 of the valve 10
  • the sealing segment 30 comprises at least a second so-called inactive second angular portion 37 which is disposed out of the first angular portion.
  • said inactive portion may, however, be partially or entirely vis-à-vis a lateral opening of the bore for discharging the valve in case of failure.
  • the second angular portion 37 is arranged according to a non-constant shrinkage of the envelope 39, which has been shown here in dotted lines.
  • a withdrawal varying between a zero value and the maximum withdrawal "r".
  • the burr 76 is therefore positioned at a point of the part 37 in which its thickness is less than the shrinkage at the same point, so that it is arranged at most with the set "J" determined associated with the maximum shrinkage "r". In this way, the angular portion 37 not participating in the seal, the burr 76 can not come into contact with the wall 20 of the bore 16 and can not take off the segment 30 of said bore 20. The sealing of the bushel 26 is thus ensured.
  • the angular portion 37 could take any desired shape. However, for obvious reasons of simplification of machining of the associated mold shell, the second portion 37 of angular portion of the segment 30 is shaped flat.
  • the joint plane 72 passing through the axis A of the segment 30, the intersections of this joint plane extend here 180 ° from each other.
  • the segment 30 extends over more than 180 °.
  • the burr 76 is arranged at 180 ° of an end free edge 43 of the segment 30.
  • an associated mold 54 comprises at least two outer shells 68, 70 comprising two substantially semi-cylindrical axial cavities 69, 71 whose facing faces are assembled in plane 72 of axial orientation joint, one of which determines the first active angular portion 35, and which determine together the second so-called inactive angular portion 37, arranged astride either side of the joint plane 72 which is disposed outside the first active angular portion 35 of cylindrical envelope.
  • the shells 68, 70 have at their junction flat portions 78, 80, shown in FIG. 5A in dotted lines, which are arranged in the extension of one another and which determine the second angular portion. 37 inactivates the segment 30 when molded.
  • the mold 54 comprises at least one internal axial core 82 of which a first substantially cylindrical section internally determines the segment. This configuration avoids any risk of burr formation in segment 30. Furthermore, to avoid coaxiality problems that could arise if two internal cores were used, the mold 54 comprises a single core 82, the first substantially cylindrical section 84 extends along an entire length of the impressions of the shells 68, 70.
  • each shell 68, 70 preferably has an impression 69, 71 which is closed at one end 86, 88 by a wall 90, 92 which is intended to fit with a complementary wall 92, 90 of the opposite shell 68, 70 and with an end face 94 of the first substantially cylindrical section of the core 82.
  • each shell 68, 70 the cavity opens on the opposite side into a cavity 100, 102 which is intended to receive a complementary part of a second section 104 of immobilization of the core 82 in the mold 54.
  • This configuration provides a mold 54 in three parts adapted to allow quick release of the segment 30 by opening the mold 54 in three directions, as shown by the arrows of Figure 5A.
  • the segment 30 obtained in this way comprises a deformation 64 similar to that of the segment described with reference to FIG. 4, in particular a shrinkage or a reduction in diameter, arranged substantially at mid-height of the segment 30, this withdrawal can be compensated by a counter-deformed 66 of the mold 54, as shown in Figure 5B. In this configuration the segment 30 can also be demolded.
  • the invention therefore proposes a valve 10 comprising a segment whose sealing is particularly reliable.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Valve Housings (AREA)

Abstract

A control valve for a fluid circulation circuit, comprising a valve body having a bore into which at least two lateral holes open and which receives a rotary barrel capable of occupying at least two angular positions to open or close said holes, the barrel comprising an axial hub, a packing gland (30) moulded in the shape of an angular portion of a cylindrical sleeve (39) surrounding the hub, connected to the hub and comprising an active sealing part (35), and a retaining ring (40) interposed between the two free ends (41, 43) of the packing gland (30) to ensure pressing of the packing gland (30) into the bore, characterized in that the packing gland (30) has at least one second angular part (37), said to be inactive, disposed outside of the first active angular part (35), which is arranged radially recessed from the cylindrical sleeve (39) and which comprises at least one moulding flash (76) arranged with play (J) recessed from the cylindrical sleeve (39).

Description

VANNE DE COMMANDE AVEC SEGMENT D'ETANCHEITE MOULE COMPORTANT UNE BAVURE LOCALISEE DANS UN RETRAIT  CONTROL VALVE WITH MOLDING SEGMENT SEGMENT COMPRISING A LOCATION BIN LOCATED IN A WITHDRAWAL
L'invention concerne une vanne de commande pour un circuit de circulation de fluide, en particulier pour un circuit de refroidissement d'un moteur thermique de véhicule automobile. The invention relates to a control valve for a fluid circulation circuit, in particular for a cooling circuit of a motor vehicle engine.
Plus particulièrement, l'invention concerne une vanne de commande pour un circuit de circulation de fluide, comprenant un corps de vanne dans une face de fixation duquel débouche un alésage axial borgne comportant une paroi de fond et une paroi périphérique dans laquelle débouchent au moins deux orifices latéraux. More particularly, the invention relates to a control valve for a fluid circulation circuit, comprising a valve body in a fixing face from which opens a blind axial bore having a bottom wall and a peripheral wall in which at least two open lateral openings.
Ledit alésage reçoit un boisseau axialement rotatif apte à occuper au moins deux positions angulaires pour ouvrir/fermer lesdits orifices latéraux en fonction de sa position angulaire pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux, ledit boisseau comportant un moyeu axial monté rotatif sur un fût axial qui s'étend à partir de la paroi de fond de l'alésage. Said bore receives an axially rotating plug adapted to occupy at least two angular positions to open / close said lateral orifices according to its angular position to allow / interrupt the distribution of the fluid through said lateral orifices, said plug having a rotary mounted axial hub. on an axial shaft extending from the bottom wall of the bore.
Un segment d'étanchéité globalement en forme de portion angulaire d'enveloppe cylindrique entoure coaxialement le moyeu dont il est solidaire en rotation. A generally angular portion of cylindrical envelope sealing segment coaxially surrounds the hub which it is integral in rotation.
On connaît déjà, d'après la demande de brevet internationale WO-A1 -2005/124205, une vanne de commande de ce type que l'on peut qualifier aussi de "vanne rotative" étant donné que le boisseau tourne autour d'un axe de rotation et est reçu dans l'alésage aménagé dans le corps de vanne. It is already known, according to the international patent application WO-A1-2005/124205, a control valve of this type that can also be described as "rotary valve" since the bushel rotates about an axis of rotation and is received in the bore formed in the valve body.
Dans cette vanne de commande connue, l'alésage débouche du corps de vanne par l'intermédiaire d'un orifice axial qui constitue habituellement une voie d'entrée pour le fluide, tandis que les orifices latéraux constituent des voies de sortie pour le fluide, la distribution du fluide au travers des voies de sortie étant contrôlée en fonction de la position angulaire prise par le boisseau. In this known control valve, the bore opens out of the valve body via an axial orifice which usually constitutes an inlet for the fluid, while the lateral orifices constitute outlet channels for the fluid, the distribution of the fluid through the output channels being controlled according to the angular position taken by the plug.
Cette vanne de commande connue trouve une application particulière dans les circuits de refroidissement de moteurs thermiques de véhicules automobiles. Dans ce cas, l'orifice axial, formant entrée de fluide, est relié à une arrivée de fluide de refroidissement en provenance du moteur thermique, tandis que les trois orifices latéraux, formant sortie de fluide, sont reliés respectivement à trois branches du circuit. Ce circuit comprend par exemple une première branche qui contient un radiateur de refroidissement du moteur, une deuxième branche qui constitue une dérivation du radiateur de refroidissement et une troisième branche qui contient un aérotherme pour le chauffage de l'habitacle. This known control valve finds a particular application in the cooling circuits of motor vehicle thermal engines. In this case, the axial orifice, forming a fluid inlet, is connected to a cooling fluid inlet coming from the heat engine, while the three orifices side, forming fluid outlet, are respectively connected to three branches of the circuit. This circuit comprises for example a first branch which contains a cooling radiator of the engine, a second branch which constitutes a bypass of the cooling radiator and a third branch which contains a heater for heating the passenger compartment.
La vanne de commande décrite dans la demande WO-A1 -2005/124205 comprend un boisseau comportant un moyeu entouré d'un segment d'étanchéité en forme de tronçon angulaire d'enveloppe cylindrique qui est par ailleurs solidaire en rotation dudit moyeu. The control valve described in the application WO-A1-2005/124205 comprises a plug having a hub surrounded by a sealing segment in the form of an angular section of cylindrical envelope which is also integral in rotation with said hub.
Pour assurer une étanchéité satisfaisante du boisseau dans l'alésage, il est nécessaire que le segment d'étanchéité soit plaqué en permanence contre la paroi de l'alésage. To ensure a satisfactory seal of the plug in the bore, it is necessary that the sealing segment is pressed permanently against the wall of the bore.
Afin de faciliter sa fabrication, le segment d'étanchéité de la vanne selon l'invention est réalisé par moulage, notamment par injection d'un matériau plastique. De nombreuses configurations d'injection ont été expérimentées. In order to facilitate its manufacture, the sealing segment of the valve according to the invention is produced by molding, in particular by injection of a plastic material. Many injection configurations have been experimented.
L'injection dans un moule dépourvu de plan de joint, avec extraction du segment selon la direction axiale, provoque des déformations importantes du segment en forme de portion d'enveloppe cylindrique, qui le rendent inutilisable. Compte-tenu de la direction d'ouverture du moule, l'utilisation d'un noyau permettant de jouer un rôle de contre- dépouille pour limiter lesdites déformations n'est non plus possible. Injection into a mold without a joint plane, with extraction of the segment in the axial direction, causes significant deformation of the segment in the form of a portion of cylindrical envelope, which renders it unusable. Given the opening direction of the mold, the use of a core to play a role of undercut to limit said deformations is also possible.
Une injection dans un moule à deux coquilles comportant un plan de joint axial permet d'obtenir un segment exempt de déformations, notamment par l'emploi d'un noyau formant contre-dépouille. Toutefois, comme le plan de joint est agencé dans un plan axial, au moins une bavure d'orientation parallèle à la direction axiale est formée à la périphérie du segment lors du moulage. Cette bavure, dont l'épaisseur est non négligeable, tend à décoller le segment de la paroi de l'alésage de la vanne, causant ainsi des fuites indésirables. An injection into a two-shell mold having an axial joint plane makes it possible to obtain a segment free of deformations, in particular by the use of an undercut core. However, since the joint plane is arranged in an axial plane, at least one parallel burr parallel to the axial direction is formed at the periphery of the segment during molding. This burr, whose thickness is not negligible, tends to take off the segment of the wall of the bore of the valve, thus causing undesirable leaks.
L'invention remédie à cet inconvénient en proposant une vanne de commande pour un circuit de circulation de fluide, comprenant un corps de vanne recevant un boisseau axialement rotatif, ledit boisseau comportant un segment d'étanchéité globalement en forme de portion angulaire d'enveloppe cylindrique apte à ouvrir/fermer de manière étanche des orifices latéraux du corps de la vanne en fonction de la position angulaire du boisseau pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux. Selon l'invention, ledit segment d'étanchéité comportant une zone, agencée radialement en retrait de l'enveloppe cylindrique et comportant au moins une bavure axiale résultant du moulage du segment. The invention overcomes this disadvantage by proposing a control valve for a fluid circulation circuit, comprising a valve body receiving an axially rotating plug, said plug having a generally angular portion of cylindrical sealing portion of cylindrical envelope able to open / close sealing of the lateral ports of the valve body according to the angular position of the plug to allow / interrupt the distribution of the fluid through said lateral orifices. According to the invention, said sealing segment comprises a zone arranged radially away from the cylindrical envelope and comprising at least one axial burr resulting from the molding of the segment.
En orientant la bavure de moulage de manière axiale, on peut limiter les déformations du boisseau. En outre, en ménageant une partie du segment d'étanchéité en retrait de son extension radiale et en disposant la bavure de moulage dans cette zone, on limite, voire on élimine les interférences entre ladite bavure et le corps de vanne. Le décollement du boisseau est ainsi limité, voire éliminé et l'étanchéité améliorée. Selon différents modes de réalisation de l'invention, qui pourront être pris ensemble ou séparément : By orienting the molding burraxially axially, the deformations of the plug can be limited. In addition, by providing a portion of the sealing segment back from its radial extension and arranging the molding burr in this area, it limits or eliminates interference between said burr and the valve body. The detachment of the bushel is thus limited or eliminated and the sealing improved. According to various embodiments of the invention, which may be taken together or separately:
- la zone agencée en retrait de l'enveloppe cylindrique est conformée en méplat, the zone arranged behind the cylindrical envelope is shaped like a flat,
- ladite bavure est agencée avec jeu (J) par rapport au corps de vanne, said flash is arranged with clearance (J) with respect to the valve body,
- ledit segment comprend une première partie angulaire, dite active, apte à ouvrir/fermer de manière étanche les orifices latéraux du corps de la vanne en fonction de la position angulaire du boisseau pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux et une deuxième partie angulaire, dite inactive, qui est disposée hors de la première partie angulaire active,  said segment comprises a first angular portion, said active, able to open / close in a sealed manner the lateral orifices of the body of the valve as a function of the angular position of the plug to allow / interrupt the distribution of the fluid through said lateral orifices; a second angular portion, said inactive, which is arranged outside the first active angular portion,
- ladite partie inactive comprend ladite zone agencée radialement en retrait de l'enveloppe cylindrique, ce qui améliore encore l'étanchéité offerte par le boisseau en éloignant la bavure de la partie du boisseau contribuant à l'ouverture/fermeture des orifices latéraux de la vanne,  said inactive portion comprises said zone arranged radially recessed from the cylindrical envelope, which further improves the sealing provided by the plug by moving the burr away from the part of the plug contributing to the opening / closing of the lateral orifices of the valve ,
- le segment s'étend sur plus de 180° et la bavure est agencée à 180° d'un bord libre d'extrémité du segment, ce qui permet de disposer d'un segment de large envergure angulaire tout en restant compatible avec les directions de démoulage qu'implique la bavure axiale,  - The segment extends over 180 ° and the burr is arranged at 180 ° of a free end edge of the segment, which allows to have a segment of wide angular extent while remaining compatible with the directions demolding that involves the axial burr,
- ladite partie active s'étend sur 180° ou moins de 180° à partir dudit bord,  said active portion extends 180 ° or less than 180 ° from said edge,
- ledit segment est réalisé par moulage par injection d'un matériau plastique.  said segment is produced by injection molding of a plastic material.
- ledit matériau plastique comprend du PTFE,  said plastic material comprises PTFE,
- ledit boisseau comporte en outre un jonc formant ressort, interposé entre deux extrémités angulaires libres du segment pour exercer un effort de rappel élastique transversal entre lesdites extrémités libres afin de déformer ledit segment radialement vers l'extérieur pour assurer un plaquage dudit segment d'étanchéité contre la paroi de l'alésage, said plug further comprises a spring-shaped rod interposed between two free angular ends of the segment to exert an elastic return force transversely between said free ends in order to deform said segment radially outwards to ensure a plating of said sealing segment against the wall of the bore,
- ledit jonc présente sensiblement la forme d'un U comportant une branche transversale de part et d'autre de laquelle sont agencées deux branches verticales parallèles qui sont rappelées en écartement par la branche transversale,  said ring has substantially the shape of a U having a transverse branch on either side of which are arranged two parallel vertical branches which are displaced in spacing by the transverse branch,
- ledit jonc est reçu dans des gouttières de réception correspondantes du segment d'étanchéité,  said ring is received in corresponding receiving troughs of the sealing segment,
- lesdites gouttières s'étendent le long des deux bords d'extrémités libres dudit segment d'étanchéité, notamment dans l'épaisseur ce dernier,  said gutters extend along the two edges of free ends of said sealing segment, in particular in the thickness thereof,
- ledit corps de vanne comprend une face de fixation dans laquelle débouche un alésage axial borgne comportant une paroi de fond et une paroi périphérique,  said valve body comprises an attachment face into which a blind axial bore opens out, comprising a bottom wall and a peripheral wall,
- ledit boisseau est logé dans ledit alésage,  said plug is housed in said bore,
- lesdits orifices latéraux sont ménagés sur ladite paroi périphérique,  said lateral orifices are formed on said peripheral wall,
- ledit boisseau comporte un moyeu axial monté rotatif sur un fût axial qui s'étend à partir de la paroi de fond de l'alésage, said plug comprises an axial hub rotatably mounted on an axial shaft which extends from the bottom wall of the bore,
- ledit segment entoure coaxialement le moyeu,  said segment coaxially surrounds the hub,
- ledit segment est solidaire en rotation dudit moyeu. L'invention concerne également un moule pour le moulage par injection d'un segment d'étanchéité en forme de portion angulaire d'enveloppe cylindrique pour une vanne de commande pour un circuit de circulation de fluide, telle que celle décrite plus haut.  said segment is integral in rotation with said hub. The invention also relates to a mold for the injection molding of a cylindrical portion angular portion sealing portion for a control valve for a fluid circulation circuit, such as that described above.
Selon l'invention, ledit moule comporte au moins deux coquilles externes comportant respectivement deux empreintes axiales sensiblement complémentaires permettant le moulage dudit segment, lesdites coquilles comprenant respectivement des faces en regard assemblées selon un plan de joint d'orientation axiale, lesdites empreintes déterminant conjointement une zone agencée radialement en retrait de l'enveloppe cylindrique au niveau dudit plan de joint. According to the invention, said mold comprises at least two external shells respectively comprising two substantially complementary axial cavities allowing the molding of said segment, said shells respectively comprising facing faces assembled in an axially oriented joint plane, said indentations jointly determining a zone arranged radially recessed from the cylindrical envelope at said joint plane.
Selon différents modes de réalisation de l'invention qui pourront être prise ensemble ou séparément, According to various embodiments of the invention that can be taken together or separately,
- lesdites empreintes sont semi-cylindriques,  said imprints are semi-cylindrical,
- l'une desdites empreintes détermine la première partie angulaire active du boisseau, - lesdites empreintes déterminent conjointement la deuxième partie angulaire inactive du boisseau, - les coquilles comportent à leur jonction des portions de méplat agencées dans le prolongement l'une de l'autre qui déterminent ladite zone agencée en retrait, one of the said indentations determines the first active angular portion of the plug, the said indentations jointly determine the second inactive angular portion of the plug, the shells comprise at their junction flattened portions arranged in the extension of one another which determine said zone arranged in recess,
- ledit moule comporte au moins un noyau axial interne dont un premier tronçon sensiblement cylindrique détermine intérieurement le segment,  said mold comprises at least one internal axial core of which a first substantially cylindrical section internally determines the segment,
- ledit moule comporte un unique noyau dont le premier tronçon sensiblement cylindrique s'étend suivant toute une longueur des empreintes des coquilles, said mold comprises a single core whose first substantially cylindrical section extends along a whole length of the fingerprints of the shells,
- chaque coquille comporte une empreinte qui est fermée à une extrémité par une paroi qui est destinée à s'ajuster avec une paroi complémentaire de la coquille opposée et avec une face d'extrémité du premier tronçon sensiblement cylindrique du noyau, et qui débouche du côté opposé dans une cavité qui est destinée à recevoir une partie complémentaire d'un second tronçon d'immobilisation du noyau dans le moule.  each shell has an imprint which is closed at one end by a wall which is intended to fit with a complementary wall of the opposite shell and with an end face of the first substantially cylindrical section of the core, and which opens on the side opposed in a cavity which is intended to receive a complementary portion of a second immobilization section of the core in the mold.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels : Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
- la figure 1 est une vue en perspective éclatée d'une vanne à boisseau tournant ; - Figure 1 is an exploded perspective view of a rotary valve;
- la figure 2 est une vue en perspective d'un segment pour la vanne de la figure 1 ; FIG. 2 is a perspective view of a segment for the valve of FIG. 1;
- les figures 3A et 3B sont des vue schématiques de moules pour la réalisation du segment pour la vanne de la figure 1 ; FIGS. 3A and 3B are diagrammatic views of molds for producing the segment for the valve of FIG. 1;
- la figure 4 est une vue schématique en coupe axiale du segment obtenu avec le moule de la figure 3A ; - Figure 4 is a schematic axial sectional view of the segment obtained with the mold of Figure 3A;
- les figures 5A et 5B sont des vue schématiques illustrant des variantes de moules pour la réalisation d'un segment pour une vanne à boisseau tournant; - la figure 6 est une vue schématique en coupe transversale du moule des figures 5A etFIGS. 5A and 5B are diagrammatic views illustrating mold variants for producing a segment for a rotary valve; FIG. 6 is a diagrammatic cross-sectional view of the mold of FIGS. 5A and
5B; 5B;
- la figure 7 est une vue en perspective d'un segment pour une vanne selon l'invention ; - la figure 8 est une vue en coupe transversale du segment de la figure 7. Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires. FIG. 7 is a perspective view of a segment for a valve according to the invention; FIG. 8 is a cross-sectional view of the segment of FIG. 7. In the following description, like reference numerals designate like parts or having similar functions.
On a représenté à la figure 1 une vanne de commande 10 pour un circuit de circulation de fluide, notamment un circuit de circulation de liquide de refroidissement d'un véhicule automobile. FIG. 1 shows a control valve 10 for a fluid circulation circuit, in particular a coolant circulation circuit of a motor vehicle.
Une telle vanne 10 est par exemple destinée à être fixée à un bloc moteur d'un véhicule, et à être reliée à différents organes du véhicule nécessitant une alimentation en liquide de refroidissement. Such a valve 10 is for example intended to be attached to an engine block of a vehicle, and to be connected to different bodies of the vehicle requiring a supply of coolant.
La vanne 10 comporte un corps de vanne 12 comportant une face 14 de fixation sur le bloc moteur associé (non représenté) du véhicule. La face 14 est par exemple une face rectifiée. The valve 10 comprises a valve body 12 having a fixing face 14 on the associated engine block (not shown) of the vehicle. The face 14 is for example a rectified face.
Un alésage 16 axial borgne du corps 12 débouche dans la face 14. A blind axial bore 16 of the body 12 opens into the face 14.
Comme l'illustre la figure 1 , l'alésage 16 comporte une paroi périphérique 20 dans laquelle débouchent au moins deux orifices latéraux (non représentés) associés à des conduits de la vanne reliés à différents organes du véhicule. As illustrated in Figure 1, the bore 16 comprises a peripheral wall 20 into which open at least two side ports (not shown) associated with valve conduits connected to different members of the vehicle.
Ainsi, à titre d'exemple et de manière non limitative de l'invention, au moins deux orifices (non représentés) associés à des conduits 22, 24, visibles à la figure 1 , débouchent dans la paroi périphérique 20 de l'alésage 16. Les conduits 22, 24 peuvent, de manière non limitative de l'invention, être associés à un radiateur de refroidissement du moteur, une dérivation du radiateur de refroidissement, ou encore un aérotherme pour le chauffage de l'habitacle du véhicule. La voie de dérivation pourra comprendre d'autres échangeurs de chaleur. L'alésage 16 reçoit un boisseau 26 monté axialement rotatif autour d'une direction axiale "A". Le boisseau 26 est monté rotatif autour d'un fût axial fixe 27 qui s'étend à partir d'une paroi de fond (non représentée) de l'alésage 20. Thus, by way of example and in a nonlimiting manner of the invention, at least two orifices (not shown) associated with conduits 22, 24, visible in FIG. 1, open into the peripheral wall 20 of the bore 16 The ducts 22, 24 may, in a non-limiting manner of the invention, be associated with an engine cooling radiator, a bypass of the cooling radiator, or a heater for heating the passenger compartment of the vehicle. The bypass route may include other heat exchangers. The bore 16 receives a plug 26 mounted axially rotatable about an axial direction "A". The plug 26 is rotatably mounted around a fixed axial shaft 27 which extends from a bottom wall (not shown) of the bore 20.
Ce boisseau 26 est apte à occuper au moins deux positions angulaires pour ouvrir/fermer les orifices latéraux pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux et par conséquent à travers les conduits 22, 24. La commande de la position angulaire du boisseau sera avantageusement configurée pour lui permettre d'occuper toutes positions angulaires voulues entre deux positions de fin de course. Comme l'illustre la figure 1 , le boisseau 26 comporte pour l'essentiel un moyeu 28 et un segment d'étanchéité 30 en forme de portion angulaire d'enveloppe cylindrique, qui entoure ledit moyeu 28 et qui est solidaire en rotation dudit moyeu 28. Le segment d'étanchéité 30 comporte une paroi périphérique externe 36 dont une partie active 35 est destinée à assurer l'étanchéité avec la paroi 20 de l'alésage 16. This plug 26 is able to occupy at least two angular positions to open / close the lateral orifices to allow / interrupt the distribution of the fluid through said lateral orifices and consequently through the ducts 22, 24. control of the angular position of the plug will be advantageously configured to allow it to occupy any desired angular positions between two end positions. As illustrated in FIG. 1, the plug 26 essentially comprises a hub 28 and a sealing segment 30 in the form of an angular portion of cylindrical envelope, which surrounds said hub 28 and which is rotationally integral with said hub 28. The sealing segment 30 has an outer peripheral wall 36, an active part 35 of which is intended to seal with the wall 20 of the bore 16.
A cet effet, de manière non limitative de l'invention, le moyeu 28 comporte un bras radial 32 dont une extrémité 34 est destinée à être reçue dans une encoche complémentaire (non représentée) formée à la surface d'une périphérie interne 38 du segment 30. Ledit segment présente ainsi la forme d'un manchon, ouvert angulairement, ledit manchon étant relié audit bras radial 32. For this purpose, in a nonlimiting manner of the invention, the hub 28 comprises a radial arm 32 whose end 34 is intended to be received in a complementary notch (not shown) formed on the surface of an inner periphery 38 of the segment 30. Said segment thus has the shape of a sleeve, open angularly, said sleeve being connected to said radial arm 32.
Le boisseau 26 comporte avantageusement un jonc 40 formant ressort qui est interposé entre les deux extrémités libres 41 , 43 de ladite portion angulaire d'enveloppe cylindrique. Le jonc 40 est apte à exercer un effort de rappel élastique transversal entre les extrémités libres 41 , 43 afin de déformer le segment 30 radialement vers l'extérieur pour assurer un plaquage dudit segment 30 d'étanchéité contre la paroi 20 de l'alésage 16. The plug 26 advantageously comprises a rod 40 forming a spring which is interposed between the two free ends 41, 43 of said angular portion of cylindrical envelope. The ring 40 is able to exert a transverse elastic return force between the free ends 41, 43 in order to deform the segment 30 radially outwards in order to ensure that said sealing segment 30 is pressed against the wall 20 of the bore 16 .
Comme l'illustre la figure 1 , le jonc 40 présente ici sensiblement la forme d'un U comportant une branche transversale 42 de part et d'autre de laquelle sont agencées deux branches verticales parallèles 44, 46 qui sont fixées dans des gouttières de réception correspondantes 48, 50 du segment d'étanchéité 30, qui s'étendent le long de bords verticaux des deux extrémités libres 41 , 43 du segment d'étanchéité 30. Lesdites gouttières sont formées, par exemple, dans l'épaisseur de matière dudit jonc 40. As illustrated in Figure 1, the rod 40 here has substantially the shape of a U having a transverse branch 42 on either side of which are arranged two parallel vertical branches 44, 46 which are fixed in receiving gutters corresponding 48, 50 of the sealing segment 30, which extend along vertical edges of the two free ends 41, 43 of the sealing segment 30. Said gutters are formed, for example, in the material thickness of said rod 40.
L'étanchéité entre les différents orifices dont l'ouverture/fermeture est déterminée par le boisseau 26 est conditionnée par l'étanchéité du segment 30 au contact de la paroi 20 de l'alésage 16. A cet effet, il est nécessaire d'une part que le segment d'étanchéité 30 soit plaqué en permanence contre la paroi 20 de l'alésage 16. Pour des raisons de simplification de fabrication, le segment 30 d'étanchéité selon l'invention est réalisé par moulage, notamment par injection d'un matériau plastique. The sealing between the various orifices whose opening / closing is determined by the plug 26 is conditioned by the sealing of the segment 30 in contact with the wall 20 of the bore 16. For this purpose, it is necessary to the sealing segment 30 is permanently pressed against the wall 20 of the bore 16. For reasons of simplification of manufacture, the sealing segment according to the invention is made by molding, in particular by injection of a plastic material.
De nombreuses configurations d'injection ont été expérimentées. Many injection configurations have been experimented.
La figure 2 représente un segment 30 obtenu après injection dans un moule (non représenté) dépourvu de plan de joint. Figure 2 shows a segment obtained after injection into a mold (not shown) without a joint plane.
Un tel segment 30 est réalisé dans un moule de forme sensiblement tubulaire et il est extrait du moule selon la direction axiale "A". Ce procédé provoque des déformations importantes du segment 30 en forme de portion d'enveloppe, notamment des défauts de planéité au voisinage des extrémités 41 , 43. La figure 2 illustre un défaut de planéité 52 de l'ordre de 0.5 mm au voisinage de l'extrémité 41 . Un tel défaut 52 rend le segment 30 inutilisable. Such a segment 30 is made in a substantially tubular mold and is extracted from the mold in the axial direction "A". This process causes significant deformation of the segment 30 in the form of an envelope portion, in particular flatness defects in the vicinity of the ends 41, 43. FIG. 2 illustrates a flatness defect 52 of the order of 0.5 mm in the vicinity of the end 41. Such a defect 52 renders the segment 30 unusable.
La figure 3A représente un tel moule. Ce dernier, repéré 54, comprend deux coquilles 56, 58 destinées à former une empreinte 60. Le moule 54 détermine à l'intérieur de l'empreinte 60 un plan 62 de joint intérieur transversal agencé sensiblement à mi- hauteur de l'empreinte 60. Comme l'illustrent les flèches de la figure 3A, les coquilles 56, 58 dont extraites en les écartant l'une de l'autre selon la direction axiale "A". Figure 3A shows such a mold. The latter, identified 54, comprises two shells 56, 58 intended to form an imprint 60. The mold 54 determines inside the imprint 60 a plane 62 of transverse inner seal arranged substantially at half height of the imprint 60 As illustrated by the arrows of FIG. 3A, the shells 56, 58 are extracted by moving them away from each other in the axial direction "A".
Comme l'illustre la figure 4, un segment 30 obtenu par ce procédé comporte une déformation 64, notamment un retrait ou une réduction de diamètre, agencée sensiblement à mi-hauteur du segment 30, comme déjà indiqué plus haut. As illustrated in FIG. 4, a segment 30 obtained by this method comprises a deformation 64, in particular a shrinkage or a diameter reduction, arranged substantially at mid-height of segment 30, as already indicated above.
On a envisagé comme l'illustre la figure 3B de compenser ce retrait par une contre- déformée 66 du moule 54. Toutefois, avec cette configuration le segment 30 ne peut plus être démoulé. Une solution permettant d'éviter une déformation du type de la déformation 64 consiste à réaliser l'injection dans un moule 54 à deux coquilles 68, 70 comportant un plan de joint axial 72. Un tel moule a été représenté aux figures figure 5A et 5B, le moule de la figure 5B prévoyant l'utilisation d'une contre-dépouille pour limiter encore mieux un tel phénomène. Ce procédé permet d'obtenir un segment 30 exempt de déformations. Toutefois, comme l'illustre la figure 6, comme le plan de joint 72 est agencé dans un plan axial, au moins une bavure 76 d'orientation parallèle à la direction axiale est formée dans la partie active 35 à la périphérie 36 du segment 30 lors du moulage. As shown in FIG. 3B, it has been envisaged to compensate for this withdrawal by a counter-deformation 66 of the mold 54. However, with this configuration, the segment 30 can no longer be demolded. A solution for avoiding a deformation of the type of the deformation 64 consists in producing the injection in a mold 54 with two shells 68, 70 having an axial joint plane 72. Such a mold has been shown in FIGS. 5A and 5B , the mold of Figure 5B providing the use of an undercut to further limit such a phenomenon. This method makes it possible to obtain a segment 30 free of deformations. However, as illustrated in FIG. 6, since the joint plane 72 is arranged in an axial plane, at least one axially parallel burr 76 is formed in the active portion 35 at the periphery 36 of the segment 30. during molding.
Cette bavure tend à décoller la partie active 35 du segment 30 de la paroi 20 de l'alésage 16 de la vanne 10 lors de sa rotation et est donc la cause de fuites au sein de la vanne 10. L'invention remédie à cet inconvénient en proposant une nouvelle conception d'une vanne comportant un segment 30 dont la bavure 76 résultant du moulage est agencée dans une zone dudit segment 30 qui, préférentiellement, ne participe pas à son étanchéité avec l'alésage 20 du corps 12 de la vanne 10. A cet effet, comme l'illustre la figure 7, l'invention propose une vanne 10 du type décrit précédemment, le segment d'étanchéité 30 comporte au moins une deuxième partie angulaire 37 dite inactive qui est disposée hors de la première partie angulaire active 35 d'enveloppe cylindrique, qui est agencée radialement en retrait de l'enveloppe cylindrique du segment 30, et qui comporte la bavure 72 résultant du moulage du segment 30, cette bavure 72 étant avantageusement agencée avec un jeu déterminé "J" par rapport à une enveloppe cylindrique 39 du segment 30. This burr tends to take off the active portion 35 of the segment 30 of the wall 20 of the bore 16 of the valve 10 during its rotation and is therefore the cause of leaks within the valve 10. The invention overcomes this drawback by proposing a new design of a valve comprising a segment 30 whose burr 76 resulting from the molding is arranged in an area of said segment 30 which, preferably, does not participate in its sealing with the bore 20 of the body 12 of the valve 10 For this purpose, as illustrated in FIG. 7, the invention proposes a valve 10 of the type described above, the sealing segment 30 comprises at least a second so-called inactive second angular portion 37 which is disposed out of the first angular portion. active cylindrical casing, which is arranged radially recessed from the cylindrical casing of the segment 30, and which comprises the burr 72 resulting from the molding of the segment 30, this burr 72 being advantageously arranged with a I u determined "J" with respect to a cylindrical casing 39 of the segment 30.
Il est à noter que ladite partie inactive pourra cependant se trouver partiellement ou en totalité en vis-à-vis d'une ouverture latérale de l'alésage destiné à une décharge de la vanne en cas de défaillance. It should be noted that said inactive portion may, however, be partially or entirely vis-à-vis a lateral opening of the bore for discharging the valve in case of failure.
Comme on peut le voir à la figure 8, la deuxième partie angulaire 37 est agencée selon un retrait par exemple non constant de l'enveloppe 39, qui a été représentée ici en pointillés. Ainsi, sur la figure 8, on a représenté un retrait variant entre une valeur nulle et le retrait maximum "r". As can be seen in FIG. 8, the second angular portion 37 is arranged according to a non-constant shrinkage of the envelope 39, which has been shown here in dotted lines. Thus, in Figure 8, there is shown a withdrawal varying between a zero value and the maximum withdrawal "r".
La bavure 76 est donc positionnée en un point de la partie 37 selon lequel son épaisseur est inférieure au retrait en ce même point, de sorte qu'elle est agencée au plus avec le jeu "J" déterminé associé au retrait maximum "r". De la sorte, la partie angulaire 37 ne participant pas à l'étanchéité, la bavure 76 ne peut rentrer en contact avec la paroi 20 de l'alésage 16 et ne peut donc décoller le segment 30 dudit alésage 20. L'étanchéité du boisseau 26 est ainsi assurée. La partie 37 angulaire pourrait prendre toute forme voulue. Toutefois, pour des raisons évidentes de simplification d'usinage de la coquille du moule associée, la deuxième partie 37 de portion angulaire du segment 30 est conformée en méplat. The burr 76 is therefore positioned at a point of the part 37 in which its thickness is less than the shrinkage at the same point, so that it is arranged at most with the set "J" determined associated with the maximum shrinkage "r". In this way, the angular portion 37 not participating in the seal, the burr 76 can not come into contact with the wall 20 of the bore 16 and can not take off the segment 30 of said bore 20. The sealing of the bushel 26 is thus ensured. The angular portion 37 could take any desired shape. However, for obvious reasons of simplification of machining of the associated mold shell, the second portion 37 of angular portion of the segment 30 is shaped flat.
Le plan de joint 72 passant par l'axe A du segment 30, les intersections de ce plan de joint s'étendent ici à 180° l'une de l'autre. The joint plane 72 passing through the axis A of the segment 30, the intersections of this joint plane extend here 180 ° from each other.
Dans le mode de réalisation préféré de l'invention, le segment 30 s'étend sur plus de 180°. Dans cette configuration, la bavure 76 est agencée à 180° d'un bord libre 43 d'extrémité du segment 30. In the preferred embodiment of the invention, the segment 30 extends over more than 180 °. In this configuration, the burr 76 is arranged at 180 ° of an end free edge 43 of the segment 30.
Cette conception permet d'éviter que le segment 30 ne comporte deux bavures opposées qui nécessiteraient deux parties angulaires inactives 37, qui réduiraient d'autant la partie active 35. Dans cette configuration, comme l'illustre la figure 5A, un moule 54 associé comporte au moins deux coquilles externes 68, 70 comportant deux empreintes axiales 69, 71 sensiblement semi-cylindriques dont des faces en regard sont assemblées selon le plan 72 de joint d'orientation axiale, dont une détermine la première partie angulaire active 35, et qui déterminent conjointement la deuxième partie angulaire dite inactive 37, agencée à cheval de part et d'autre du plan de joint 72 qui est disposée hors de la première partie angulaire active 35 d'enveloppe cylindrique. This design prevents the segment 30 from having two opposite burrs that would require two inactive angular portions 37, which would correspondingly reduce the active portion 35. In this configuration, as illustrated in FIG. 5A, an associated mold 54 comprises at least two outer shells 68, 70 comprising two substantially semi-cylindrical axial cavities 69, 71 whose facing faces are assembled in plane 72 of axial orientation joint, one of which determines the first active angular portion 35, and which determine together the second so-called inactive angular portion 37, arranged astride either side of the joint plane 72 which is disposed outside the first active angular portion 35 of cylindrical envelope.
Il sera donc compris que les coquilles 68, 70 comportent à leur jonction des portions de méplat 78, 80, représentées sur la figure 5A en pointillés, qui sont agencées dans le prolongement l'une de l'autre et qui déterminent la deuxième partie angulaire 37 inactive du segment 30 une fois moulé. It will therefore be understood that the shells 68, 70 have at their junction flat portions 78, 80, shown in FIG. 5A in dotted lines, which are arranged in the extension of one another and which determine the second angular portion. 37 inactivates the segment 30 when molded.
Avantageusement, le moule 54 comporte au moins un noyau axial 82 interne dont un premier tronçon sensiblement cylindrique détermine intérieurement le segment. Cette configuration permet d'éviter tout risque de formation de bavure dans le segment 30. Par ailleurs, pour éviter également des problèmes de coaxialité qui pourraient survenir si deux noyaux internes étaient utilisés, le moule 54 comporte un unique noyau 82 dont le premier tronçon sensiblement cylindrique 84 s'étend suivant toute une longueur des empreintes des coquilles 68, 70. Advantageously, the mold 54 comprises at least one internal axial core 82 of which a first substantially cylindrical section internally determines the segment. This configuration avoids any risk of burr formation in segment 30. Furthermore, to avoid coaxiality problems that could arise if two internal cores were used, the mold 54 comprises a single core 82, the first substantially cylindrical section 84 extends along an entire length of the impressions of the shells 68, 70.
Ainsi, de préférence chaque coquille 68, 70 comporte une empreinte 69, 71 qui est fermée à une extrémité 86, 88 par une paroi 90, 92 qui est destinée à s'ajuster avec une paroi complémentaire 92, 90 de la coquille opposée 68, 70 et avec une face d'extrémité 94 du premier tronçon sensiblement cylindrique du noyau 82. Thus, each shell 68, 70 preferably has an impression 69, 71 which is closed at one end 86, 88 by a wall 90, 92 which is intended to fit with a complementary wall 92, 90 of the opposite shell 68, 70 and with an end face 94 of the first substantially cylindrical section of the core 82.
A l'autre extrémité 96, 98 de chaque coquille 68, 70, l'empreinte débouche du côté opposé dans une cavité 100, 102 qui est destinée à recevoir une partie complémentaire d'un second tronçon 104 d'immobilisation du noyau 82 dans le moule 54. Cette configuration permet d'obtenir un moule 54 en trois parties apte à permettre un démoulage rapide du segment 30 en ouvrant le moule 54 suivant trois directions, comme représenté par les flèches de la figure 5A. At the other end 96, 98 of each shell 68, 70, the cavity opens on the opposite side into a cavity 100, 102 which is intended to receive a complementary part of a second section 104 of immobilization of the core 82 in the mold 54. This configuration provides a mold 54 in three parts adapted to allow quick release of the segment 30 by opening the mold 54 in three directions, as shown by the arrows of Figure 5A.
Même dans le cas où le segment 30 obtenu de cette manière comporterait une déformation 64 analogue à celle du segment décrit en référence à la figure 4, notamment un retrait ou une réduction de diamètre, agencée sensiblement à mi-hauteur du segment 30, ce retrait peut être compensé par une contre-déformée 66 du moule 54, comme représenté à la figure 5B. Dans cette configuration le segment 30 peut également être démoulé. Even in the case where the segment 30 obtained in this way comprises a deformation 64 similar to that of the segment described with reference to FIG. 4, in particular a shrinkage or a reduction in diameter, arranged substantially at mid-height of the segment 30, this withdrawal can be compensated by a counter-deformed 66 of the mold 54, as shown in Figure 5B. In this configuration the segment 30 can also be demolded.
L'invention propose donc une vanne 10 comportant un segment dont l'étanchéité est particulièrement fiable. The invention therefore proposes a valve 10 comprising a segment whose sealing is particularly reliable.

Claims

Revendications claims
1 . Vanne (10) de commande pour un circuit de circulation de fluide, comprenant un corps de vanne (12) recevant un boisseau (26) axialement rotatif, ledit boisseau (26) comportant un segment d'étanchéité (30) globalement en forme de portion angulaire d'enveloppe cylindrique (39) apte à ouvrir/fermer de manière étanche des orifices latéraux du corps de la vanne en fonction de la position angulaire du boisseau pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux, ledit segment (30) étant réalisé par moulage, ledit segment d'étanchéité (30) comportant une zone, agencée radialement en retrait de l'enveloppe cylindrique (39) et comportant au moins une bavure axiale (76) résultant du moulage du segment (30). 1. Control valve (10) for a fluid circulation circuit, comprising a valve body (12) receiving an axially rotatable plug (26), said plug (26) having a generally portion-shaped sealing segment (30) angular cylindrical envelope (39) adapted to open / close in a sealed manner the lateral orifices of the valve body according to the angular position of the plug to allow / interrupt the distribution of the fluid through said lateral orifices, said segment (30 ) being made by molding, said sealing segment (30) having a zone arranged radially recessed from the cylindrical envelope (39) and comprising at least one axial burr (76) resulting from the molding of the segment (30).
2. Vanne selon la revendication précédente dans lequel ledit segment comprend une première partie angulaire (35), dite active, apte à ouvrir/fermer de manière étanche les orifices latéraux du corps de la vanne en fonction de la position angulaire du boisseau pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux et une deuxième partie angulaire (37), dite inactive, qui est disposée hors de la première partie angulaire active (35), ladite partie inactive comprenant ladite zone agencée radialement en retrait de l'enveloppe cylindrique (39). 2. Valve according to the preceding claim wherein said segment comprises a first angular portion (35), said active, adapted to open / close in a sealed manner the lateral orifices of the body of the valve according to the angular position of the plug to allow / interrupting the distribution of the fluid through said lateral orifices and a second angular portion (37), said inactive, which is disposed outside the first active angular portion (35), said inactive portion comprising said zone arranged radially recessed from the envelope cylindrical (39).
3. Vanne (10) selon l'une quelconque des revendications précédentes, dans laquelle la zone agencée en retrait de l'enveloppe cylindrique est conformée en méplat. 3. Valve (10) according to any one of the preceding claims, wherein the zone arranged behind the cylindrical envelope is shaped flat.
4. Vanne (10) selon l'une quelconque des revendications précédentes, dans laquelle le segment s'étend sur plus de 180° et la bavure (76) est agencée à 180° d'un bord libre4. Valve (10) according to any one of the preceding claims, wherein the segment extends over more than 180 ° and the burr (76) is arranged at 180 ° of a free edge
(41 ) d'extrémité du segment (30). (41) end of the segment (30).
5. Vanne (10) selon l'une quelconque revendication précédente dans laquelle ladite bavure est agencée avec jeu (J) par rapport au corps de vanne. 5. Valve (10) according to any preceding claim wherein said flash is arranged with clearance (J) relative to the valve body.
6. Vanne (10) selon l'une quelconque des revendications précédentes dans laquelle ledit segment (30) est réalisé par moulage par injection d'un matériau plastique. The valve (10) according to any one of the preceding claims wherein said segment (30) is made by injection molding of a plastic material.
7. Vanne (10) selon la revendication précédente dans laquelle ledit matériau plastique comprend du PTFE. 7. Valve (10) according to the preceding claim wherein said plastic material comprises PTFE.
8. Vanne (10) selon l'une quelconque des revendications précédentes dans laquelle ledit boisseau comporte en outre un jonc (40) formant ressort, interposé entre deux extrémités angulaires libres (41 , 43) du segment (30) pour exercer un effort de rappel élastique transversal entre lesdites extrémités libres (41 , 43) afin de déformer ledit segment (30) radialement vers l'extérieur pour assurer un plaquage dudit segment d'étanchéité (30) contre la paroi (20) de l'alésage (16). 8. Valve (10) according to any one of the preceding claims wherein said plug further comprises a rod (40) forming a spring interposed between two free angular ends (41, 43) of the segment (30) to exert a force of transverse elastic return between said free ends (41, 43) for deforming said segment (30) radially outwards to ensure a plating of said sealing segment (30) against the wall (20) of the bore (16) .
9. Vanne (10) selon la revendication précédente dans laquelle ledit jonc (40) présente sensiblement la forme d'un U comportant une branche (42) transversale de part et d'autre de laquelle sont agencées deux branches verticales parallèles (44, 46) qui sont rappelées en écartement par la branche transversale (42). 9. Valve (10) according to the preceding claim wherein said rod (40) has substantially the shape of a U having a branch (42) transverse to either side of which are arranged two parallel vertical branches (44, 46). ) which are spaced apart by the transverse branch (42).
10. Vanne (10) selon l'une quelconque des revendications 8 ou 9 dans laquelle ledit jonc (40) est reçu dans des gouttières (48, 50) de réception correspondantes du segment (30) d'étanchéité, lesdites gouttières (48, 50) s'étendant le long des deux extrémités libres (41 , 43) dudit segment d'étanchéité (30) dans l'épaisseur ce dernier. 10. Valve (10) according to any one of claims 8 or 9 wherein said rod (40) is received in corresponding gutters (48, 50) for receiving the segment (30) of sealing, said gutters (48, 50) extending along the two free ends (41, 43) of said sealing segment (30) in the thickness thereof.
1 1 . Moule (54) pour le moulage par injection d'un segment d'étanchéité (30) en forme de portion angulaire d'enveloppe cylindrique (39) pour une vanne (10) de commande pour un circuit de circulation de fluide, qui comprend un corps de vanne (12) recevant un boisseau (26) axialement rotatif, ledit boisseau (26) comportant un segment d'étanchéité (30) globalement en forme de portion angulaire d'enveloppe cylindrique (39) apte à ouvrir/fermer de manière étanche des orifices latéraux du corps de la vanne en fonction de la position angulaire du boisseau pour autoriser/interrompre la distribution du fluide au travers desdits orifices latéraux. caractérisé en ce qu'il comporte au moins deux coquilles (68, 70) externes comportant respectivement deux empreintes axiales (69, 71 ) sensiblement complémentaires permettant le moulage dudit segment, lesdites coquilles comprenant respectivement des faces en regard assemblées selon un plan de joint (72) d'orientation axiale, lesdites empreintes déterminant conjointement une zone agencée radialement en retrait de l'enveloppe cylindrique (39) au niveau dudit plan de joint. 1 1. Mold (54) for the injection molding of a cylindrical portion angular portion sealing portion (30) of a cylindrical shell (39) for a control valve (10) for a fluid circulation circuit, which comprises a valve body (12) receiving an axially rotating plug (26), said plug (26) having a sealing segment (30) generally in the form of an angular portion of a cylindrical envelope (39) able to open / close in a sealed manner lateral ports of the valve body according to the angular position of the plug to allow / interrupt the fluid distribution through said lateral ports. characterized in that it comprises at least two outer shells (68, 70) respectively comprising two substantially complementary axial recesses (69, 71) allowing the molding of said segment, said shells respectively comprising facing faces assembled in a joint plane ( 72) of axial orientation, said indentations jointly determining an area arranged radially recessed from the cylindrical envelope (39) at said joint plane.
12. Moule (54) selon la revendication précédente dans lequel les coquilles comportent à leur jonction des portions de méplat agencées dans le prolongement l'une de l'autre qui déterminent la zone agencée en retrait. 12. Mold (54) according to the preceding claim wherein the shells have at their junction flat portions arranged in the extension of one another which determine the zone arranged recessed.
13. Moule (54) selon l'une des revendications 1 1 ou 12 comportant au moins un noyau axial interne (82) dont un premier tronçon (84) sensiblement cylindrique détermine intérieurement le segment (30). 13. Mold (54) according to one of claims 1 1 or 12 comprising at least one inner axial core (82), a first substantially cylindrical section (84) internally determines the segment (30).
14. Moule (54) selon la revendication précédente comportant un unique noyau (82) dont le premier tronçon (84) sensiblement cylindrique s'étend suivant toute une longueur des empreintes (69, 71 ) des coquilles (68, 70). 14. Mold (54) according to the preceding claim comprising a single core (82), the first substantially cylindrical section (84) extends along an entire length of the impressions (69, 71) of the shells (68, 70).
15. Moule (54) selon la revendication précédente dans lequel chaque coquille (68, 70) comporte une empreinte (69, 71 ) qui est fermée à une extrémité (86, 88) par une paroi (90, 92) qui est destinée à s'ajuster avec une paroi complémentaire (90, 92) de la coquille opposée (68, 70) et avec une face d'extrémité (94) du premier tronçon (84) sensiblement cylindrique du noyau (82), et qui débouche du côté opposé dans une cavité (100, 102) qui est destinée à recevoir une partie complémentaire d'un second tronçon (104) d'immobilisation du noyau (82) dans le moule (54). 15. Mold (54) according to the preceding claim wherein each shell (68, 70) has an imprint (69, 71) which is closed at one end (86, 88) by a wall (90, 92) which is intended for fit with a complementary wall (90, 92) of the opposite shell (68, 70) and with an end face (94) of the first substantially cylindrical section (84) of the core (82), and which opens on the side opposed in a cavity (100, 102) which is intended to receive a complementary portion of a second section (104) of immobilization of the core (82) in the mold (54).
PCT/EP2014/077738 2013-12-19 2014-12-15 Control valve with moulded packing gland comprising a flash located in a recess WO2015091344A1 (en)

Applications Claiming Priority (2)

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FR1363025 2013-12-19
FR1363025A FR3015622B1 (en) 2013-12-19 2013-12-19 CONTROL VALVE WITH MOLDING SEGMENT SEGMENT COMPRISING A LOCATION BIN LOCATED IN A WITHDRAWAL

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114516137A (en) * 2020-11-19 2022-05-20 美的集团股份有限公司 Design method of injection mold, injection molding method and injection mold

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Publication number Priority date Publication date Assignee Title
DE2853686A1 (en) * 1978-12-13 1980-07-03 Michael Tussing Dental root channel tool - made integral with shank having flats around mould joint flashes
JPS57205112A (en) * 1981-06-12 1982-12-16 Matsushita Electric Ind Co Ltd Manufacture of shaft
JPS58101009A (en) * 1981-09-24 1983-06-16 Seikosha Co Ltd Molding apparatus for synthetic resin shaft
WO1998001924A1 (en) * 1996-07-09 1998-01-15 The Whitaker Corporation Precision molded cylinders
WO2005124205A1 (en) 2004-05-17 2005-12-29 Valeo Systemes Thermiques Control valve with sealing segment for fluid circulation circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2853686A1 (en) * 1978-12-13 1980-07-03 Michael Tussing Dental root channel tool - made integral with shank having flats around mould joint flashes
JPS57205112A (en) * 1981-06-12 1982-12-16 Matsushita Electric Ind Co Ltd Manufacture of shaft
JPS58101009A (en) * 1981-09-24 1983-06-16 Seikosha Co Ltd Molding apparatus for synthetic resin shaft
WO1998001924A1 (en) * 1996-07-09 1998-01-15 The Whitaker Corporation Precision molded cylinders
WO2005124205A1 (en) 2004-05-17 2005-12-29 Valeo Systemes Thermiques Control valve with sealing segment for fluid circulation circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114516137A (en) * 2020-11-19 2022-05-20 美的集团股份有限公司 Design method of injection mold, injection molding method and injection mold

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FR3015622A1 (en) 2015-06-26

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