WO2015032978A1 - Cartridge heater, thermostatic element comprising such a cartridge, thermostatic valve including such a thermostatic element, and method for assembling such a cartridge in such a valve - Google Patents

Cartridge heater, thermostatic element comprising such a cartridge, thermostatic valve including such a thermostatic element, and method for assembling such a cartridge in such a valve Download PDF

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Publication number
WO2015032978A1
WO2015032978A1 PCT/EP2014/069193 EP2014069193W WO2015032978A1 WO 2015032978 A1 WO2015032978 A1 WO 2015032978A1 EP 2014069193 W EP2014069193 W EP 2014069193W WO 2015032978 A1 WO2015032978 A1 WO 2015032978A1
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WO
WIPO (PCT)
Prior art keywords
end portion
frustoconical
orifice
cartridge
housing
Prior art date
Application number
PCT/EP2014/069193
Other languages
French (fr)
Inventor
Loïc MADOUX
Original Assignee
Vernet
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 Vernet filed Critical Vernet
Publication of WO2015032978A1 publication Critical patent/WO2015032978A1/en

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple

Definitions

  • the present invention relates to a heating cartridge for a thermostatic element, a thermostatic element comprising such a cartridge, and a thermostatic valve comprising such a thermostatic element. It also relates to a method of assembling such a cartridge in such a valve.
  • thermostatic valves are used to distribute a fluid entering different lanes, depending on the temperature of this fluid.
  • These valves are said to be thermostatic in the sense that the displacement of their internal shutter (s) is controlled by a thermostatic element, that is to say an element which comprises a cup, containing a thermally expandable material, and a piston.
  • the cup or the piston being slidably movable relative to the piston or the cup, respectively, under the action of the thermally expandable material when it expands or contracts.
  • thermodilatable material which allows to control the valve from outside thereof, independently or in addition to the temperature of the incoming fluid, in particular by means of a computer embedded in the vehicle and programmed appropriately.
  • the heating cartridge comprises a heating resistor arranged inside a tubular casing which consists either of the abovementioned piston or of a similar metal tube: by immobilizing, for example, this casing on the outer casing of the valve , the electrical supply of the resistor causes a rise in temperature of the thermally expandable material, resulting, by expansion of the latter, the sliding of the cup around the piston, a shutter being carried by the cup to act on the circulation of the fluid through the valve.
  • the outer casing of the valve typically made of plastic material, has an internal cavity in which the aforementioned fluid is adapted to circulate, and a wall which closes the internal cavity and which is provided with an orifice adapted to receive electrical connection means for supplying current to the heating resistor.
  • the envelope said tubular thus comprises a first end portion, which is adapted to be immersed in the thermally expandable material, and a second end portion, which is opposite to the first end portion, along the longitudinal axis of the envelope, and which is inserted into the orifice.
  • this second end portion comprises at least one bearing zone, which extends radially with respect to the longitudinal axis and abuts, via a plane contact, against the wall of the housing, around of the orifice.
  • the mechanical fixing of the casing to the casing, via insertion into the orifice of the second end portion and the force exerted by the return spring, is likely to suffer from sealing defects.
  • the cup tends, when moving away from the housing, when the temperature of the thermally expandable material increases, to frictionally drive the envelope following the same movement and thus to move the support zone relative to the wall. This causes the leakage of fluid into the orifice, the fluid being clean then to reach the electrical connection means.
  • the object of the present invention is to provide a heating cartridge for thermostatic element, the attachment of the casing to the housing of a corresponding thermostatic valve is improved.
  • the subject of the invention is a heating cartridge for a thermostatic element, comprising:
  • thermoly conductive tubular casing which extends along a longitudinal axis and of which a first end portion is adapted to be immersed in a thermally expandable material of the thermostatic element
  • electrical connection means capable of supplying current to the electrical resistance and opening towards the outside of the tubular casing via a second end portion of the tubular casing, which is, along the longitudinal axis, opposite to the first end portion .
  • the second end portion comprises a frustoconical portion, which is centered on the longitudinal axis and which converges towards the first end portion and the second end portion further comprises a mechanical support collar , which in a direction opposite to the first end portion extends the frustoconical portion and which is provided with at least one elastic fastening tab.
  • the frustoconical shape of the aforementioned portion of the second end portion and the one or more fastening tabs allow an optimized assembly of the heating cartridge to a valve and more particularly to the housing of a valve, by jamming.
  • the frustoconical shape allows a better distribution of the forces undergone by the heating cartridge during the use of a valve comprising such a heating cartridge, and a better holding of the envelope to these efforts.
  • the frustoconical shape facilitates the stamping of the tubular casing of the cartridge.
  • the diameter of the large circular base of the frustoconical portion is between 120% and 500%, preferably between 150% and 300%, of the diameter of the small circular base of the frustoconical portion;
  • the height of the frustoconical portion, measured parallel to the longitudinal axis is between 2% and 10%, preferably between 3% and 7%, of the height of the tubular casing, measured parallel to the longitudinal axis; ;
  • the diameter of the small circular base is equal to the diameter of the first end portion
  • the invention also relates to a thermostatic element, comprising a heating cartridge as defined above, and a cup containing a thermally expandable material in which is dipped the first end portion of the envelope of the heating cartridge.
  • the invention also relates to a thermostatic valve, comprising a housing and a thermostatic element, while the thermostatic element is as defined above and while the housing comprises an internal cavity in which a fluid is adapted to circulate, and a wall which closes the internal cavity and is provided with an orifice adapted to receive the electrical connection means, and while the wall forms around the orifice a frustoconical surface, centered on a central axis of the orifice, the frustoconical surface around the orifice being of complementary shape of a frustoconical internal surface of the frustoconical portion, the frustoconical inner surface being wedged by complementarity of shapes around the frustoconical surface, which is around the orifice, along the axis central.
  • the thermostatic valve comprises one or more of the following characteristics, taken separately or in any technically permissible combination:
  • the heating cartridge of the thermostatic element is as defined above and the second end portion comprises a mechanical support flange, which in a direction opposite to the first end portion extends the frustoconical portion and which is provided with less an elastic fastening tab, while the wall forms a first receiving housing of the one or more tabs, and while one end of the tab or tabs bears radially against the wall at this first housing;
  • the wall forms between the small circular base and the first end portion a second housing for receiving a circular seal, the circular seal being disposed in the second housing, centered on the longitudinal axis and positioned around the tubular envelope.
  • the invention also relates to a method of assembling a heating cartridge in a valve, the heating cartridge comprising: a thermally conductive tubular casing which extends along a longitudinal axis and of which a first end portion is adapted to be immersed in a thermally expandable material of the thermostatic element,
  • electrical connection means capable of supplying current to the electrical resistance and opening towards the outside of the tubular envelope via a second end portion of the tubular envelope, which is, along the longitudinal axis, opposite to the first end portion .
  • the method comprises the following steps:
  • the second end portion comprising a frustoconical portion which has a frustoconical internal surface
  • a housing comprising an internal cavity and a wall, which closes the internal cavity and is provided with an orifice, the wall forming, along a central axis of the orifice, around the orifice, a surface frustoconical complementary shape of the frustoconical internal surface of the frustoconical portion.
  • FIG. 1 is a section of a thermostatic valve, made in a longitudinal sectional plane of a thermostatic element belonging to this valve;
  • FIG. 2 is an exploded perspective view of the heating cartridge according to the invention, a portion of the valve housing of Figure 1 and a seal;
  • FIG. 3 is an assembled configuration view of the heating cartridge, the housing part and the gasket of FIG. 2;
  • FIG. 4 is a longitudinal section of the heating cartridge in assembled configuration.
  • thermostatic valve V1 comprising a housing 8, made for example of a plastic material or a metal alloy, and a thermostatic element 10.
  • the housing 8 is adapted so that a fluid, such as a cooling liquid when the valve V1 belongs to a cooling circuit for a heat engine, circulates in the housing 8 in a controlled manner by the other components of the valve V1.
  • the housing 8 comprises a tubular main body January 1 extending lengthwise centrally about a longitudinal axis X-X.
  • the housing 8 also comprises a pipe 12 which opens transversely into one of the longitudinal ends of the body 1 1, the body 1 1 and the pipe 12 being connected by a bent region 13 of the housing 8.
  • the aforementioned fluid s' flows through the body 1 1 and the tubing 12, circulating in particular in an internal cavity 14 of the housing 8, which is defined in the bent region 13.
  • the housing 8 comprises a wall 16 which closes the internal cavity 14, in the direction of the longitudinal axis XX, and is provided with an orifice 17. As best seen in FIG. 2, the wall 16 forms around the orifice 17 a frustoconical surface S16, centered on a central axis of the orifice, coincident with the longitudinal axis XX.
  • the flow of the aforementioned fluid is regulated, here at the end of the body 1 1 opposite the pipe 12, by a shutter valve 18 centered on the axis XX and movable in translation along this axis: when this valve is pressed in a sealed manner against a seat 20 defined by the aforementioned end of the body 1 1, as shown in Figure 1, the flow of the fluid is interrupted, whereas when the valve 18 is spaced from the seat 20, the fluid can circulate freely around the valve 18 and thus enter or leave the body 1 1.
  • the valve V1 also comprises a return spring 21 interposed between the valve 18 and a rigid armature 22 integral with the housing 8 by arrangements not shown in detail and known per se.
  • the displacement of the valve 18 is controlled by the thermostatic element 10 which, for this purpose, comprises, in a manner well known in the art, on the one hand, a cup 31, which contains a thermally expandable material 32 and around which is secured fixedly the valve 18, for example by fitting, and secondly, a tube 33 forming a piston, which partly dips into the cup 31 and which is displaceable in translation along the longitudinal axis XX, coincides with a central longitudinal axis XX of the tube 33, under the action of the expansion of the thermally expandable material 32.
  • the element thermostatic 10 is arranged vis-à-vis the housing 8 so that, firstly, its piston tube 33 is centered on the axis XX and, secondly, the tube 33 is fixedly connected to the housing 8 here at the bent region 13 of the housing 8, as further specified later.
  • the tube 33 is fixed relative to the housing 8, while the cup 31 and the valve 18 that it carries are movable, along the axis X-X, relative to the housing 8, under the effect of the thermally expandable material, when the latter expands, or, when this material contracts, under the opposite effect of the return spring 21.
  • the tube 33 of the thermostatic element 10 is one of the components of a heating cartridge C1 integrated in the thermostatic element.
  • the tube 33 comprises a first end portion 33.1 and a second end portion 33.2.
  • the tube 33 constitutes an outer tubular casing 33 for the heating cartridge C1, inside which are arranged an electric heating resistor 34, as well as electrical connection means 35 adapted to supply current to the electrical resistance 34 .
  • the heating resistor 34 is arranged inside the first end portion 33.1 of the casing 33, adapted to be immersed in the cup 31, so that this heating resistor 34 is able to heat the thermally expandable material 32 contained in the cup 31.
  • the envelope 33 is made, at least as regards its first end portion 33.1, a thermally conductive material, typically metal.
  • the end portion 33.1 of the casing 33 is assembled to the cup 31 of the thermostatic element 30, being immersed in the thermally expandable material 32 of this cup 31, and in a sealed manner by means of arrangements known per se and not detailed here, these arrangements not being limiting of the present invention.
  • the second end portion 33.2 is opposed to the first end portion 33.1 along the longitudinal axis X-X.
  • the electrical connection means 35 open outwardly from the tubular casing 33 via the second end portion 33.2.
  • the second end portion 33.2 comprises a frustoconical internal surface S38, on a portion 38, described as frustoconical, which is centered on the longitudinal axis XX and which converges towards the first part. terminal 33.1.
  • the inner surface S38 and the surface S16 are complementary, so that, in the assembled state of the valve V1, the inner surface S38 is jammed by complementarity of shapes around the surface S16, along the axis XX.
  • the surfaces S38 and S16 respectively internal and around the orifice, are preferably frustoconical with a circular base as shown in FIGS. 1 to 4. In a variant, the surfaces S38 and S16 are elliptical-based.
  • portion designates an axial subpart of the second end portion 33.2, and not a peripheral sector.
  • the end portion 33.2 also comprises a second portion 44 in the extension of the frustoconical portion 38, going in a direction opposite to the end portion 33.1.
  • the portion 44 forms a flange 44, which is provided with a plurality of elastic tabs 46.
  • the flange 44 is integral with the rest of the casing 33, being noted that other possibilities of joining are possible.
  • the end portion 33.2 is axially inserted inside the main body January 1 of the housing 8, being engaged via the end of this body opposite the bent region 13, in order to to be fixed to the housing 8, and inserted into the orifice 17.
  • the diameter D40 of the large circular base 40 of the frustoconical internal surface S38 is between 120% and 500%, preferably between 150% and 300% of the diameter D42 of the small circular base 42 of the inner surface S38.
  • the diameter D42 of the small circular base 42 is equal to the diameter D33.1 of the first end portion 33.1.
  • H33 is the height of the tubular casing 33, measured parallel to the longitudinal axis X-X and H38 the height of the frustoconical portion 38, measured parallel to the longitudinal axis.
  • the height H38 of the portion 38 is between 2% and 10%, preferably between 3% and 7%, of the height H33 of the tubular casing 33.
  • the connecting means 35 emerging outside the casing 33 are arranged axially through the wall 16 of the casing 8, and more particularly through the orifice 17, so that that, on the one hand, the connecting means 35 are arranged inside a void space 48 delimited in the thickness of the bent region 13 of the casing 8 and, on the other hand, the wall 16 forms a housing 49 to receive the tabs 46. More specifically, one end 50 of the tabs 46 bears radially against the wall 16 at the housing 49.
  • each lug 46 is also axially against the wall 16, since the ends 50, generally metallic, tend to fit into the material, generally plastic, forming the casing 8.
  • the elastic tabs 46 improve the attachment of the casing 33 to the casing 8, by resilience effect.
  • the elastic tabs 46 are, in the embodiment considered, of generally trapezoidal shape and oriented towards the first end portion 33.1.
  • the tabs 46 are distributed around the outer periphery of the collar 44.
  • the tabs 46 define, between two tabs 46 succeeding each other around the axis XX, at least one notch not occupied by one of the elastic tabs 46. It will be understood that this notch forms an angular indexing mark around the axis XX, of the envelope 33, thus facilitating the assembly of the heating cartridge C1 equipped with this envelope 33 within a thermostatic valve similar to the valve V1.
  • this seal 52 is arranged radially in a second receiving housing 54, formed by the wall 16, between the small circular base 42 and the first end portion 33.1.
  • the seal 52 is centered on the longitudinal axis XX and positioned around the tubular casing 33.
  • this seal 52 is advantageously provided for occupying and sealing the empty space 48, comprising the connecting means 35, screws with the fluid circulating in the cavity 14.
  • the seal 52 is replaced by another functionally similar sealing means, such as an adhesive or a sealing paste.
  • the electrical connection means 35 are, within the aforementioned empty space 48, respectively electrically connected to an external power source, not shown, suitable for controlling the current flowing through. the resistor 34, and therefore the increase or decrease of the temperature of the heat-transferable material 32.
  • the connecting means 35 are connected to the external power source via a connector accessible on an outer face of the housing 8.
  • a method of assembling the heating cartridge C1 in the valve V1 comprises different steps.
  • a first step is the production of the tubular casing 33, preferably by stamping, the frustoconical inner surface S38 being easy to manufacture by stamping.
  • the housing 8 is molded so that it comprises the internal cavity 14 and the wall 16, which forms around the orifice 17 the frustoconical surface S16.
  • the cartridge C1 is inserted in the orifice 17, with the internal surface S38 which is jammed around the surface S16, via a force E1 pressure exerted along the central axis XX towards the orifice 17.
  • the pressure force E1 is exerted until the end 60 of the casing 33, furthest from the first part 33.1, along the longitudinal axis XX, is in abutment along the axis longitudinal XX, against the wall 16 at the vertical stop 62.
  • the wall 16 exerts a compressive force on the tabs 46 in order to deform them radially to the longitudinal axis X-X.
  • the diameter of the first housing 49 measured in a radial direction to the central axis XX, is smaller than the diameter of the flange 44, the tabs 46 are therefore, during the insertion of the cartridge C1 in the orifice 17 , deformed by the wall 16 at the first housing 49 and the end 50 of each lug 46 is in radial abutment against the wall 16.
  • the lugs 46 are generally inserted into the plastic of the housing 8 of the wall 16 and are therefore in radial but also axial bearing against the wall 16.
  • the cartridge C1 is fixed to the housing 8 and immobilized relative to the housing 8. Then, the seal 52 is inserted along the longitudinal axis XX around the envelope 33, until it is positioned in the second housing 54.
  • the cup 31 can be positioned so that the first end portion 33.1 is immersed in the thermally expandable material. Then, the return spring 21 is installed between the valve 18 and the rigid armature 22 integral with the casing 8, in order to hold the system in place, that is to say to maintain in position the cartridge C1 and to influence on the position of the valve 18 and the cup 31.
  • the fixing of the casing 33 to the casing 8 is optimized thanks to the jamming of the internal surface S38 around the surface S16 and to the lugs 46 which bear radial and axial bearing against the wall 16.
  • the frustoconical shape of the surfaces S38 and S16, respectively internal and around the orifice 17, makes it possible to properly center the casing 33, and therefore the heating cartridge C1 relative to the casing 8 and to the orifice 17, as well as to favor the attachment of the casing 33 to the casing 8 by jamming effect.
  • the frustoconical shape of the surfaces S38 and S16 also favors the distribution of the forces axial, along the longitudinal axis XX, at the wall 16 and more precisely the surface S16, which allows a good resistance to axial forces, for example undergone by the cartridge C1 when the cup 31 corresponding moves towards the orifice 17 or opposite the orifice 17 along the longitudinal axis XX.
  • the mechanical stresses experienced by the casing 8 are therefore better distributed and absorbed and the casing 8 retains its shape, which guarantees a good seal between the cavity 14 and the electrical connection means 35.
  • the frustoconical shape of the internal surface S38 promotes the manufacture of the cartridge C1 by stamping.
  • each lug 46 bears radially against the wall 16, which improves the attachment of the casing 33 to the casing 8, since each end 50 of the lugs 46 exerts a force radially to the central axis XX, towards the central axis XX.
  • the tabs 46 and more precisely the end 50 of each tab is locked in the material of the housing 8 and the wall 16, which improves the attachment of the envelope 33 to housing 8 and further promotes sealing between the cavity 14 and the electrical connection means 35.
  • each lug 46 extends is between 10% and 150% of the diameter of the large circular base of the surface S16, which guarantees a limited space requirement. tabs 46 in the valve V1.
  • the seal is therefore always guaranteed, since the cartridge can not be separated from the housing 8 and no operator can disassemble the cartridge C1 of the valve V1, then reinsert it incorrectly into the orifice 17.
  • the outer shell of the heating cartridge which is arranged, among others, the heating electric resistance of the cartridge, is the piston of the corresponding thermostatic element; however, for other valve construction geometries thermostatic, this envelope of the heating cartridge and the piston of the thermostatic element, whose thermodilatable material is heated by the heating resistor belonging to the cartridge, may consist of two separate parts; in this case, generally, the outer shell of the heating cartridge extends through the bottom of the cup of the thermostatic element, opposite the piston of this thermostatic element, the cup then being fixed relative to the housing of the valve, while the piston of the thermostatic element carries a shutter to control the opening and closing of the latter vis-à-vis the housing.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Temperature-Responsive Valves (AREA)

Abstract

The invention relates to a cartridge heater (C1) for a thermostatic element (10) which includes a thermally conductive tubular casing (33) which extends along a longitudinal axis (X-X) and a first end portion (33.1) of which is adapted such as to be buried in a thermodilatable material (32) of the thermostatic element (10), and an electric resistance heater (34), arranged inside the first end portion (33.1) of the casing (33). The cartridge heater (C1) also includes electrical connection means (35) suitable for supplying current to the resistance heater (34) and leading to the outside of the tubular casing (33) via a second end portion (33.2) of the tubular casing (33), which is, along the longitudinal axis (X-X), opposite the first end portion (33.1). The second end portion (33.2) includes a first frusto-conical portion (38), which is centred on the longitudinal axis (X-X) and converges towards the first end portion (33.1).

Description

CARTOUCHE CHAUFFANTE, ELEMENT THERMOSTATIQUE  HEAT CARTRIDGE, THERMOSTATIC ELEMENT
COMPORTANT UNE TELLE CARTOUCHE, VANNE THERMOSTATIQUE COMPRENANT UN TEL ELEMENT THERMOSTATIQUE, PROCEDE D'ASSEMBLAGE  COMPRISING SUCH A CARTRIDGE, THERMOSTATIC VALVE COMPRISING SUCH A THERMOSTATIC ELEMENT, ASSEMBLY METHOD
D'UNE TELLE CARTOUCHE DANS UNE TELLE VANNE  SUCH A CARTRIDGE IN SUCH A VALVE
La présente invention concerne une cartouche chauffante pour un élément thermostatique, un élément thermostatique comportant une telle cartouche, ainsi qu'une vanne thermostatique comportant un tel élément thermostatique. Elle concerne également un procédé d'assemblage d'une telle cartouche dans une telle vanne. The present invention relates to a heating cartridge for a thermostatic element, a thermostatic element comprising such a cartridge, and a thermostatic valve comprising such a thermostatic element. It also relates to a method of assembling such a cartridge in such a valve.
Dans de nombreuses applications du domaine fluidique, notamment pour le refroidissement des moteurs thermiques de véhicules, des vannes thermostatiques sont utilisées pour répartir un fluide entrant dans différentes voies de circulation, en fonction de la température de ce fluide. Ces vannes sont dites thermostatiques dans le sens où le déplacement de leur(s) obturateur(s) interne(s) est commandé par un élément thermostatique, c'est-à-dire un élément qui comprend une coupelle, contenant une matière thermodilatable, et un piston. La coupelle ou le piston étant déplaçable en coulissement par rapport respectivement au piston ou à la coupelle, sous l'action de la matière thermodilatable lorsque celle-ci se dilate ou se contracte.  In many applications of the fluidic field, in particular for the cooling of thermal engines of vehicles, thermostatic valves are used to distribute a fluid entering different lanes, depending on the temperature of this fluid. These valves are said to be thermostatic in the sense that the displacement of their internal shutter (s) is controlled by a thermostatic element, that is to say an element which comprises a cup, containing a thermally expandable material, and a piston. The cup or the piston being slidably movable relative to the piston or the cup, respectively, under the action of the thermally expandable material when it expands or contracts.
Pour répartir le fluide en fonction d'autres paramètres, notamment des conditions extérieures à la vanne comme la température ambiante ou la charge du véhicule propulsé par le moteur équipé de la vanne, il est connu d'intégrer à la vanne une cartouche électrique pour chauffer la matière thermodilatable, ce qui permet de piloter la vanne depuis l'extérieur de celle-ci, indépendamment ou en complément de la température du fluide entrant, notamment au moyen d'un calculateur embarqué dans le véhicule et programmé de façon appropriée. La cartouche chauffante comporte à cet effet une résistance chauffante, agencée à l'intérieur d'une enveloppe tubulaire qui consiste soit en le piston précité, soit en un tube métallique analogue : en immobilisant, par exemple, cette enveloppe au boîtier externe de la vanne, l'alimentation électrique de la résistance provoque une montée en température de la matière thermodilatable, ce qui entraîne, par dilatation de cette dernière, le coulissement de la coupelle autour du piston, un obturateur étant porté par cette coupelle pour agir sur la circulation du fluide à travers la vanne.  In order to distribute the fluid according to other parameters, in particular conditions external to the valve, such as the ambient temperature or the load of the vehicle propelled by the engine equipped with the valve, it is known to integrate an electric cartridge for heating with the valve. thermodilatable material, which allows to control the valve from outside thereof, independently or in addition to the temperature of the incoming fluid, in particular by means of a computer embedded in the vehicle and programmed appropriately. For this purpose, the heating cartridge comprises a heating resistor arranged inside a tubular casing which consists either of the abovementioned piston or of a similar metal tube: by immobilizing, for example, this casing on the outer casing of the valve , the electrical supply of the resistor causes a rise in temperature of the thermally expandable material, resulting, by expansion of the latter, the sliding of the cup around the piston, a shutter being carried by the cup to act on the circulation of the fluid through the valve.
En pratique, le boîtier externe de la vanne, typiquement en matière plastique, comporte une cavité interne, dans laquelle le fluide précité est propre à circuler, et une paroi qui ferme la cavité interne et qui est munie d'un orifice propre à recevoir des moyens de liaison électrique afin d'alimenter en courant la résistance chauffante. L'enveloppe tubulaire précitée comprend ainsi une première partie terminale, qui est adaptée pour être plongée dans la matière thermodilatable, et une deuxième partie terminale, qui est opposée à la première partie terminale, suivant l'axe longitudinal de l'enveloppe, et qui est insérée dans l'orifice. Selon une disposition classique et très répandu, cette deuxième partie terminale comprend au moins une zone d'appui, qui s'étend radialement par rapport à l'axe longitudinal et est en butée, via un contact plan, contre la paroi du boîtier, autour de l'orifice. Puis la coupelle est installée de manière à ce que la première partie terminale soit en contact direct ou indirect, avec la matière thermodilatable, et un ressort de rappel est positionné en appui contre la coupelle et permet de maintenir en place le système, c'est-à-dire de maintenir l'assemblage entre la coupelle, l'enveloppe et le boîtier. Dans une telle vanne, on comprend que l'enveloppe précitée est fixe par rapport au boîtier et que la coupelle se déplace, suivant l'axe longitudinal de l'enveloppe, en fonction de la température de la matière thermodilatable. Un exemple d'une telle cartouche chauffante et d'une telle vanne est fourni par les demandes de brevet FR-A-2 957 395 et FR-A- 2 943 754 et également par le document DE 20 2009 018408 U1 qui ne divulgue pas précisément comment l'enveloppe est fixée au boîtier. In practice, the outer casing of the valve, typically made of plastic material, has an internal cavity in which the aforementioned fluid is adapted to circulate, and a wall which closes the internal cavity and which is provided with an orifice adapted to receive electrical connection means for supplying current to the heating resistor. The envelope said tubular thus comprises a first end portion, which is adapted to be immersed in the thermally expandable material, and a second end portion, which is opposite to the first end portion, along the longitudinal axis of the envelope, and which is inserted into the orifice. According to a conventional and widespread arrangement, this second end portion comprises at least one bearing zone, which extends radially with respect to the longitudinal axis and abuts, via a plane contact, against the wall of the housing, around of the orifice. Then the cup is installed so that the first end portion is in direct or indirect contact with the thermally expandable material, and a return spring is positioned in abutment against the cup and keeps the system in place, it is to maintain the assembly between the cup, the casing and the casing. In such a valve, it is understood that the aforementioned casing is fixed relative to the housing and that the cup moves, along the longitudinal axis of the casing, depending on the temperature of the thermally expandable material. An example of such a heating cartridge and such a valve is provided by the patent applications FR-A-2 957 395 and FR-A-2 943 754 and also by the document DE 20 2009 018408 U1 which does not disclose exactly how the envelope is attached to the case.
Cependant, dans une telle vanne, la fixation mécanique de l'enveloppe au boîtier, via l'insertion dans l'orifice de la seconde partie terminale et l'effort exercé par le ressort de rappel, est susceptible de souffrir de défauts d'étanchéité, malgré l'utilisation de joints d'étanchéité. En effet, la coupelle a tendance, lorsqu'elle s'éloigne du boîtier, lorsque la température de la matière thermodilatable augmente, à entraîner par frottement l'enveloppe suivant le même mouvement et ainsi à déplacer la zone d'appui par rapport à la paroi. Ceci entraîne la fuite de fluide dans l'orifice, le fluide étant propre alors à atteindre les moyens de liaison électrique. De plus, des défauts d'étanchéité existent avec un tel système de fixation lorsque l'enveloppe subit des efforts dans une direction inclinée par rapport à l'axe longitudinal, qui conduisent à un mouvement pendulaire de la cartouche et à un décollement de la zone de maintien par rapport à la paroi. En outre, l'enveloppe est maintenue uniquement par le ressort de rappel, il y a donc un risque de sortie de l'enveloppe de l'orifice vers la coupelle. Enfin, lorsque la coupelle se dirige vers l'orifice, suite à une diminution de la température de la matière thermodilatable, elle entraine par frottement l'enveloppe suivant son mouvement, qui exerce alors un effort sur la paroi, qui est généralement en plastique, ce qui conduit à un écrasement du boîtier et, à la longue, à son affaiblissement autour de l'orifice. Le but de la présente invention est de proposer une cartouche chauffante pour élément thermostatique, dont la fixation de l'enveloppe au boîtier d'une vanne thermostatique correspondante est améliorée. However, in such a valve, the mechanical fixing of the casing to the casing, via insertion into the orifice of the second end portion and the force exerted by the return spring, is likely to suffer from sealing defects. , despite the use of gaskets. Indeed, the cup tends, when moving away from the housing, when the temperature of the thermally expandable material increases, to frictionally drive the envelope following the same movement and thus to move the support zone relative to the wall. This causes the leakage of fluid into the orifice, the fluid being clean then to reach the electrical connection means. In addition, sealing defects exist with such a fastening system when the envelope is subjected to forces in a direction inclined relative to the longitudinal axis, which lead to a pendular movement of the cartridge and to a detachment of the zone. holding relative to the wall. In addition, the casing is held only by the return spring, so there is a risk of exit of the casing of the orifice to the cup. Finally, when the cup is moving towards the orifice, following a decrease in the temperature of the thermally expandable material, it causes the casing to frictionally follow its movement, which then exerts a force on the wall, which is generally made of plastic, which leads to a crushing of the housing and, in the long run, to its weakening around the orifice. The object of the present invention is to provide a heating cartridge for thermostatic element, the attachment of the casing to the housing of a corresponding thermostatic valve is improved.
A cet effet, l'invention a pour objet une cartouche chauffante pour un élément thermostatique, comprenant :  For this purpose, the subject of the invention is a heating cartridge for a thermostatic element, comprising:
une enveloppe tubulaire thermiquement conductrice qui s'étend suivant un axe longitudinal et dont une première partie terminale est adaptée pour être plongée dans une matière thermodilatable de l'élément thermostatique,  a thermally conductive tubular casing which extends along a longitudinal axis and of which a first end portion is adapted to be immersed in a thermally expandable material of the thermostatic element,
une résistance électrique chauffante, agencée à l'intérieur de la première partie terminale de l'enveloppe, et  an electric heating resistor arranged inside the first end portion of the casing, and
des moyens de liaison électrique propres à alimenter en courant la résistance électrique et débouchant vers l'extérieur de l'enveloppe tubulaire via une seconde partie terminale de l'enveloppe tubulaire, qui est, suivant l'axe longitudinale, opposée à la première partie terminale.  electrical connection means capable of supplying current to the electrical resistance and opening towards the outside of the tubular casing via a second end portion of the tubular casing, which is, along the longitudinal axis, opposite to the first end portion .
Conformément à l'invention, la seconde partie terminale comprend une portion tronconique, qui est centrée sur l'axe longitudinal et qui est convergente en direction de la première partie terminale et la seconde partie terminale comprend, en outre, une collerette d'appui mécanique, qui dans une direction opposée à la première partie terminale prolonge la portion tronconique et qui est munie d'au moins une patte élastique de fixation.  According to the invention, the second end portion comprises a frustoconical portion, which is centered on the longitudinal axis and which converges towards the first end portion and the second end portion further comprises a mechanical support collar , which in a direction opposite to the first end portion extends the frustoconical portion and which is provided with at least one elastic fastening tab.
Grâce à l'invention, la forme tronconique de la portion précitée de la seconde partie terminale et la ou les pattes de fixation permettent un assemblage optimisé de la cartouche chauffante à une vanne et plus particulièrement au boîtier d'une vanne, par coincement. En outre, la forme tronconique permet une meilleure répartition des efforts subits par la cartouche chauffante au cours de l'utilisation d'une vanne comprenant une telle cartouche chauffante, et une meilleure tenue de l'enveloppe à ces efforts. Enfin la forme tronconique permet de faciliter la fabrication par emboutissage de l'enveloppe tubulaire de la cartouche.  Thanks to the invention, the frustoconical shape of the aforementioned portion of the second end portion and the one or more fastening tabs allow an optimized assembly of the heating cartridge to a valve and more particularly to the housing of a valve, by jamming. In addition, the frustoconical shape allows a better distribution of the forces undergone by the heating cartridge during the use of a valve comprising such a heating cartridge, and a better holding of the envelope to these efforts. Finally, the frustoconical shape facilitates the stamping of the tubular casing of the cartridge.
Suivant des caractéristiques additionnelles avantageuses de la cartouche chauffante conforme à l'invention, prises isolément ou selon toutes les combinaisons techniquement possibles :  According to additional advantageous features of the heating cartridge according to the invention, taken separately or in any technically possible combination:
- le diamètre de la grande base circulaire de la portion tronconique est compris entre 120% et 500%, de préférence entre 150% et 300%, du diamètre de la petite base circulaire de la portion tronconique ; - la hauteur de la portion tronconique, mesurée parallèlement à l'axe longitudinal, est comprise entre 2% et 10%, de préférence entre 3% et 7%, de la hauteur de l'enveloppe tubulaire, mesurée parallèlement à l'axe longitudinal ; the diameter of the large circular base of the frustoconical portion is between 120% and 500%, preferably between 150% and 300%, of the diameter of the small circular base of the frustoconical portion; the height of the frustoconical portion, measured parallel to the longitudinal axis, is between 2% and 10%, preferably between 3% and 7%, of the height of the tubular casing, measured parallel to the longitudinal axis; ;
- le diamètre de la petite base circulaire est égal au diamètre de la première partie terminale ;  the diameter of the small circular base is equal to the diameter of the first end portion;
L'invention a également pour objet un élément thermostatique, comprenant une cartouche chauffante telle que définie ci-dessus, ainsi qu'une coupelle contenant une matière thermodilatable dans laquelle est plongée la première partie terminale de l'enveloppe de la cartouche chauffante.  The invention also relates to a thermostatic element, comprising a heating cartridge as defined above, and a cup containing a thermally expandable material in which is dipped the first end portion of the envelope of the heating cartridge.
L'invention a également pour objet une vanne thermostatique, comportant un boîtier et un élément thermostatique, alors que l'élément thermostatique est tel que défini ci-dessus et alors que le boîtier comprend une cavité interne dans laquelle un fluide est propre à circuler, et une paroi qui ferme la cavité interne et est munie d'un orifice propre à recevoir les moyens de liaison électrique, et tandis que la paroi forme autour de l'orifice une surface tronconique, centrée sur un axe central de l'orifice, la surface tronconique autour de l'orifice étant de forme complémentaire d'une surface interne tronconique de la portion tronconique, la surface interne tronconique étant coincée par complémentarité de formes autour de la surface tronconique, qui est autour de l'orifice, suivant l'axe central.  The invention also relates to a thermostatic valve, comprising a housing and a thermostatic element, while the thermostatic element is as defined above and while the housing comprises an internal cavity in which a fluid is adapted to circulate, and a wall which closes the internal cavity and is provided with an orifice adapted to receive the electrical connection means, and while the wall forms around the orifice a frustoconical surface, centered on a central axis of the orifice, the frustoconical surface around the orifice being of complementary shape of a frustoconical internal surface of the frustoconical portion, the frustoconical inner surface being wedged by complementarity of shapes around the frustoconical surface, which is around the orifice, along the axis central.
Suivant d'autres aspects avantageux de l'invention, la vanne thermostatique comprend une ou plusieurs des caractéristiques suivantes, prises isolément ou selon toutes les combinaisons techniquement admissibles :  According to other advantageous aspects of the invention, the thermostatic valve comprises one or more of the following characteristics, taken separately or in any technically permissible combination:
- la cartouche chauffante de l'élément thermostatique est telle que définie ci- dessus et la seconde partie terminale comprend une collerette d'appui mécanique, qui dans une direction opposée à la première partie terminale prolonge la portion tronconique et qui est munie d'au moins une patte élastique de fixation, alors que la paroi forme un premier logement de réception de la ou des pattes, et tandis qu'une extrémité de la ou des pattes est en appui radial contre la paroi au niveau de ce premier logement ;  the heating cartridge of the thermostatic element is as defined above and the second end portion comprises a mechanical support flange, which in a direction opposite to the first end portion extends the frustoconical portion and which is provided with less an elastic fastening tab, while the wall forms a first receiving housing of the one or more tabs, and while one end of the tab or tabs bears radially against the wall at this first housing;
- la paroi forme entre la petite base circulaire et la première partie terminale un deuxième logement de réception d'un joint d'étanchéité circulaire, le joint circulaire étant disposé dans le deuxième logement, centré sur l'axe longitudinal et positionné autour de l'enveloppe tubulaire.  - The wall forms between the small circular base and the first end portion a second housing for receiving a circular seal, the circular seal being disposed in the second housing, centered on the longitudinal axis and positioned around the tubular envelope.
L'invention concerne également un procédé d'assemblage d'une cartouche chauffante dans une vanne, la cartouche chauffante comprenant : une enveloppe tubulaire thermiquement conductrice qui s'étend suivant un axe longitudinal et dont une première partie terminale est adaptée pour être plongée dans une matière thermodilatable de l'élément thermostatique, The invention also relates to a method of assembling a heating cartridge in a valve, the heating cartridge comprising: a thermally conductive tubular casing which extends along a longitudinal axis and of which a first end portion is adapted to be immersed in a thermally expandable material of the thermostatic element,
une résistance électrique chauffante, agencée à l'intérieur de la première partie terminale de l'enveloppe, et  an electric heating resistor arranged inside the first end portion of the casing, and
des moyens de liaison électrique propres à alimenter en courant la résistance électrique et débouchant vers l'extérieur de l'enveloppe tubulaire via une seconde partie terminale de l'enveloppe tubulaire, qui est, suivant l'axe longitudinale, opposée à la première partie terminal.  electrical connection means capable of supplying current to the electrical resistance and opening towards the outside of the tubular envelope via a second end portion of the tubular envelope, which is, along the longitudinal axis, opposite to the first end portion .
Conformément à l'invention, le procédé comprend les étapes suivantes :  According to the invention, the method comprises the following steps:
-a) la fabrication de l'enveloppe tubulaire, la seconde partie terminale comprenant une portion tronconique qui comporte une surface interne tronconique,  -a) the manufacture of the tubular envelope, the second end portion comprising a frustoconical portion which has a frustoconical internal surface,
- b) le moulage d'un boîtier comprenant une cavité interne et une paroi, qui ferme la cavité interne et est muni d'un orifice, la paroi formant suivant un axe central de l'orifice, autour de l'orifice, une surface tronconique de forme complémentaire de la surface interne tronconique de la portion tronconique.  b) molding a housing comprising an internal cavity and a wall, which closes the internal cavity and is provided with an orifice, the wall forming, along a central axis of the orifice, around the orifice, a surface frustoconical complementary shape of the frustoconical internal surface of the frustoconical portion.
- c) l'insertion de la cartouche dans l'orifice, la surface interne tronconique venant se coincer autour de la surface tronconique, qui est autour de l'orifice, via un effort de pression exercé, suivant l'axe central, en direction de l'orifice.  c) inserting the cartridge into the orifice, the frustoconical inner surface coming to wedge around the frustoconical surface, which is around the orifice, via a pressure force exerted, along the central axis, in the direction of the orifice.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins sur lesquels :  The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings in which:
- la figure 1 est une coupe d'une vanne thermostatique, réalisée selon un plan de coupe longitudinale d'un élément thermostatique appartenant à cette vanne ;  - Figure 1 is a section of a thermostatic valve, made in a longitudinal sectional plane of a thermostatic element belonging to this valve;
- la figure 2 est une vue en perspective éclatée de la cartouche chauffante conforme à l'invention, d'une partie du boîtier de la vanne de la figure 1 et d'un joint d'étanchéité ;  - Figure 2 is an exploded perspective view of the heating cartridge according to the invention, a portion of the valve housing of Figure 1 and a seal;
- la figure 3 est une vue en configuration assemblée de la cartouche chauffante, de la partie du boîtier et du joint de la figure 2 ; et  FIG. 3 is an assembled configuration view of the heating cartridge, the housing part and the gasket of FIG. 2; and
- la figure 4 est une coupe longitudinale de la cartouche chauffante en configuration assemblée.  - Figure 4 is a longitudinal section of the heating cartridge in assembled configuration.
Sur la figure 1 est représentée une vanne thermostatique V1 comportant un boîtier 8, réalisé par exemple en une matière plastique ou en un alliage métallique, et un élément thermostatique 10.  In Figure 1 is shown a thermostatic valve V1 comprising a housing 8, made for example of a plastic material or a metal alloy, and a thermostatic element 10.
Le boîtier 8 est adapté de manière à ce qu'un fluide, tel qu'un liquide de refroidissement lorsque la vanne V1 appartient à un circuit de refroidissement pour un moteur thermique, circule dans le boîtier 8 de manière régulée par les autres composants de la vanne V1 . The housing 8 is adapted so that a fluid, such as a cooling liquid when the valve V1 belongs to a cooling circuit for a heat engine, circulates in the housing 8 in a controlled manner by the other components of the valve V1.
Le boîtier 8 comprend un corps principal tubulaire 1 1 qui s'étend en longueur de manière centrée autour d'un axe longitudinal X-X. Le boîtier 8 comprend également une tubulure 12 qui débouche transversalement dans l'une des extrémités longitudinales du corps 1 1 , le corps 1 1 et la tubulure 12 étant reliés par une région coudée 13 du boîtier 8. En service, le fluide précité s'écoule à travers le corps 1 1 et la tubulure 12, en circulant notamment dans une cavité interne 14 du boîtier 8, qui est délimitée dans la région coudée 13.  The housing 8 comprises a tubular main body January 1 extending lengthwise centrally about a longitudinal axis X-X. The housing 8 also comprises a pipe 12 which opens transversely into one of the longitudinal ends of the body 1 1, the body 1 1 and the pipe 12 being connected by a bent region 13 of the housing 8. In use, the aforementioned fluid s' flows through the body 1 1 and the tubing 12, circulating in particular in an internal cavity 14 of the housing 8, which is defined in the bent region 13.
Le boîtier 8 comprend une paroi 16 qui ferme la cavité interne 14, suivant la direction de l'axe longitudinal X-X, et est munie d'un orifice 17. Comme mieux visible sur la figure 2, la paroi 16 forme autour de l'orifice 17 une surface S16 tronconique, centrée sur un axe central de l'orifice, confondu avec l'axe longitudinal X-X.  The housing 8 comprises a wall 16 which closes the internal cavity 14, in the direction of the longitudinal axis XX, and is provided with an orifice 17. As best seen in FIG. 2, the wall 16 forms around the orifice 17 a frustoconical surface S16, centered on a central axis of the orifice, coincident with the longitudinal axis XX.
L'écoulement du fluide précité est régulé, ici au niveau de l'extrémité du corps 1 1 opposée à la tubulure 12, par un clapet d'obturation 18 centré sur l'axe X-X et déplaçable en translation selon cet axe : lorsque ce clapet est appuyé de manière étanche contre un siège 20 délimité par l'extrémité précitée du corps 1 1 , comme représenté sur la figure 1 , l'écoulement du fluide est interrompu, tandis que, lorsque le clapet 18 est écarté du siège 20, le fluide peut circuler librement autour du clapet 18 et ainsi entrer dans ou sortir du corps 1 1 .  The flow of the aforementioned fluid is regulated, here at the end of the body 1 1 opposite the pipe 12, by a shutter valve 18 centered on the axis XX and movable in translation along this axis: when this valve is pressed in a sealed manner against a seat 20 defined by the aforementioned end of the body 1 1, as shown in Figure 1, the flow of the fluid is interrupted, whereas when the valve 18 is spaced from the seat 20, the fluid can circulate freely around the valve 18 and thus enter or leave the body 1 1.
La vanne V1 comprend également un ressort de rappel 21 interposé entre le clapet 18 et une armature rigide 22 solidaire du boîtier 8 par des aménagements non représentés en détail et connus en soi.  The valve V1 also comprises a return spring 21 interposed between the valve 18 and a rigid armature 22 integral with the housing 8 by arrangements not shown in detail and known per se.
En pratique, diverses formes de réalisation sont envisageables pour ce qui concerne le boîtier 8, le clapet 18, le ressort 21 et l'armature 22, sans être limitatives de l'invention. Ainsi, par exemple, plutôt que le siège 20 d'appui du clapet 18 soit délimité directement par le boîtier 8, ce siège peut, à titre de variante non représentée, être délimité par une partie dédiée de l'armature 22.  In practice, various embodiments are possible with regard to the housing 8, the valve 18, the spring 21 and the armature 22, without being limited to the invention. Thus, for example, rather than the bearing seat 20 of the valve 18 is delimited directly by the housing 8, this seat can, as a variant not shown, be delimited by a dedicated portion of the frame 22.
Le déplacement du clapet 18 est commandé par l'élément thermostatique 10 qui, à cet effet, comprend, de manière bien connue dans le domaine, d'une part, une coupelle 31 , qui contient une matière thermodilatable 32 et autour de laquelle est solidarisé fixement le clapet 18, par exemple par emmanchement, et d'autre part, un tube 33 formant piston, qui plonge en partie dans la coupelle 31 et qui est déplaçable en translation suivant l'axe longitudinal X-X, confondu avec un axe longitudinal central X-X du tube 33, sous l'action de la dilatation de la matière thermodilatable 32. L'élément thermostatique 10 est agencé vis-à-vis du boîtier 8 de telle sorte que, d'une part, son tube formant piston 33 est centré sur l'axe X-X et, d'autre part, ce tube 33 est lié fixement au boîtier 8, ici au niveau de la région coudée 13 du boîtier 8, comme spécifié plus en détail par la suite. Ainsi, lorsque la vanne V1 en service, le tube 33 est fixe par rapport au boîtier 8, tandis que la coupelle 31 et le clapet 18 qu'elle porte sont déplaçables, suivant l'axe X- X, par rapport au boîtier 8, sous l'effet de la matière thermodilatable, lorsque celle-ci se dilate, ou bien, lorsque cette matière se contracte, sous l'effet opposé du ressort de rappel 21 . The displacement of the valve 18 is controlled by the thermostatic element 10 which, for this purpose, comprises, in a manner well known in the art, on the one hand, a cup 31, which contains a thermally expandable material 32 and around which is secured fixedly the valve 18, for example by fitting, and secondly, a tube 33 forming a piston, which partly dips into the cup 31 and which is displaceable in translation along the longitudinal axis XX, coincides with a central longitudinal axis XX of the tube 33, under the action of the expansion of the thermally expandable material 32. The element thermostatic 10 is arranged vis-à-vis the housing 8 so that, firstly, its piston tube 33 is centered on the axis XX and, secondly, the tube 33 is fixedly connected to the housing 8 here at the bent region 13 of the housing 8, as further specified later. Thus, when the valve V1 in use, the tube 33 is fixed relative to the housing 8, while the cup 31 and the valve 18 that it carries are movable, along the axis X-X, relative to the housing 8, under the effect of the thermally expandable material, when the latter expands, or, when this material contracts, under the opposite effect of the return spring 21.
Le tube 33 de l'élément thermostatique 10 est l'un des composants d'une cartouche chauffante C1 intégrée à l'élément thermostatique. Le tube 33 comprend une première partie terminale 33.1 et une seconde partie terminale 33.2.  The tube 33 of the thermostatic element 10 is one of the components of a heating cartridge C1 integrated in the thermostatic element. The tube 33 comprises a first end portion 33.1 and a second end portion 33.2.
Dans ce contexte, le tube 33 constitue une enveloppe tubulaire externe 33 pour la cartouche chauffante C1 , à l'intérieur de laquelle sont agencées une résistance électrique chauffante 34, ainsi que des moyens de liaison électrique 35 propres à alimenter en courant la résistance électrique 34.  In this context, the tube 33 constitutes an outer tubular casing 33 for the heating cartridge C1, inside which are arranged an electric heating resistor 34, as well as electrical connection means 35 adapted to supply current to the electrical resistance 34 .
Plus précisément, la résistance chauffante 34 est agencée à l'intérieur de la première partie terminale 33.1 de l'enveloppe 33, adaptée pour être plongée dans la coupelle 31 , afin que cette résistance chauffante 34 soit apte à chauffer la matière thermodilatable 32 contenue dans la coupelle 31 . A cette fin, l'enveloppe 33 est réalisée, au moins pour ce qui concerne sa première partie terminale 33.1 , en un matériau thermiquement conducteur, typiquement en métal. En particulier, la partie terminale 33.1 de l'enveloppe 33 est assemblée à la coupelle 31 de l'élément thermostatique 30, en étant plongée dans la matière thermodilatable 32 de cette coupelle 31 , et ce de manière étanche moyennant des aménagements connus en soi et non détaillés ici, ces aménagements n'étant pas limitatifs de la présente invention.  More specifically, the heating resistor 34 is arranged inside the first end portion 33.1 of the casing 33, adapted to be immersed in the cup 31, so that this heating resistor 34 is able to heat the thermally expandable material 32 contained in the cup 31. To this end, the envelope 33 is made, at least as regards its first end portion 33.1, a thermally conductive material, typically metal. In particular, the end portion 33.1 of the casing 33 is assembled to the cup 31 of the thermostatic element 30, being immersed in the thermally expandable material 32 of this cup 31, and in a sealed manner by means of arrangements known per se and not detailed here, these arrangements not being limiting of the present invention.
La seconde partie terminale 33.2 est opposée à la première partie terminale 33.1 suivant l'axe longitudinal X-X. Les moyens de liaison électrique 35 débouchent vers l'extérieur de l'enveloppe tubulaire 33, via la seconde partie terminale 33.2.  The second end portion 33.2 is opposed to the first end portion 33.1 along the longitudinal axis X-X. The electrical connection means 35 open outwardly from the tubular casing 33 via the second end portion 33.2.
Comme bien visible sur les figures 2 à 4, la seconde partie terminale 33.2 comprend une surface interne tronconique S38, sur une portion 38, qualifiée de tronconique, qui est centrée sur l'axe longitudinal X-X et qui est convergente en direction de la première partie terminale 33.1 . La surface interne S38 et la surface S16 sont complémentaires, de sorte que, à l'état assemblé de la vanne V1 , la surface interne S38 est coincée par complémentarité de formes autour de la surface S16, suivant l'axe X-X. Les surfaces S38 et S16, respectivement interne et autour de l'orifice, sont de préférence tronconiques à base circulaire comme présenté aux figures 1 à 4. En variante, les surfaces S38 et S16 sont à base elliptique. As clearly visible in FIGS. 2 to 4, the second end portion 33.2 comprises a frustoconical internal surface S38, on a portion 38, described as frustoconical, which is centered on the longitudinal axis XX and which converges towards the first part. terminal 33.1. The inner surface S38 and the surface S16 are complementary, so that, in the assembled state of the valve V1, the inner surface S38 is jammed by complementarity of shapes around the surface S16, along the axis XX. The surfaces S38 and S16, respectively internal and around the orifice, are preferably frustoconical with a circular base as shown in FIGS. 1 to 4. In a variant, the surfaces S38 and S16 are elliptical-based.
On notera que, dans le présent document, le terme portion désigne bien une sous partie axiale de la seconde partie terminale 33.2, et non un secteur périphérique.  It should be noted that, in this document, the term portion designates an axial subpart of the second end portion 33.2, and not a peripheral sector.
La partie terminale 33.2 comprend également une deuxième portion 44 dans le prolongement de la portion tronconique 38, en allant dans une direction opposée à la partie terminale 33.1 . La portion 44 forme une collerette 44, qui est munie d'une pluralité de pattes élastiques 46.  The end portion 33.2 also comprises a second portion 44 in the extension of the frustoconical portion 38, going in a direction opposite to the end portion 33.1. The portion 44 forms a flange 44, which is provided with a plurality of elastic tabs 46.
Dans l'exemple de réalisation considéré sur les figures 1 à 4, la collerette 44 est venue de matière avec le reste de l'enveloppe 33, étant remarqué que d'autres possibilités de solidarisation sont envisageables.  In the embodiment shown in Figures 1 to 4, the flange 44 is integral with the rest of the casing 33, being noted that other possibilities of joining are possible.
Lors de l'assemblage de la vanne V1 , la partie terminale 33.2 est axialement introduite à l'intérieur du corps principal 1 1 du boîtier 8, en y étant engagée via l'extrémité de ce corps opposée à la région coudée 13, afin d'être fixée au boîtier 8, et insérée dans l'orifice 17.  During the assembly of the valve V1, the end portion 33.2 is axially inserted inside the main body January 1 of the housing 8, being engaged via the end of this body opposite the bent region 13, in order to to be fixed to the housing 8, and inserted into the orifice 17.
Le diamètre D40 de la grande base circulaire 40 de la surface interne tronconique S38 est compris entre 120% et 500%, de préférence entre 150% et 300% du diamètre D42 de la petite base circulaire 42 de la surface interne S38. En outre, le diamètre D42 de la petite base circulaire 42 est égal au diamètre D33.1 de la première partie terminale 33.1 .  The diameter D40 of the large circular base 40 of the frustoconical internal surface S38 is between 120% and 500%, preferably between 150% and 300% of the diameter D42 of the small circular base 42 of the inner surface S38. In addition, the diameter D42 of the small circular base 42 is equal to the diameter D33.1 of the first end portion 33.1.
Par ailleurs, on note H33 la hauteur de l'enveloppe tubulaire 33, mesurée parallèlement à l'axe longitudinal X-X et H38 la hauteur de la portion tronconique 38, mesurée parallèlement à l'axe longitudinal. La hauteur H38 de la portion 38 est comprise entre 2% et 10%, de préférence entre 3% et 7%, de la hauteur H33 de l'enveloppe tubulaire 33.  Furthermore, H33 is the height of the tubular casing 33, measured parallel to the longitudinal axis X-X and H38 the height of the frustoconical portion 38, measured parallel to the longitudinal axis. The height H38 of the portion 38 is between 2% and 10%, preferably between 3% and 7%, of the height H33 of the tubular casing 33.
A l'état assemblé de la vanne V1 , les moyens de liaison 35 émergeant à l'extérieur de l'enveloppe 33, sont agencés axialement à travers la paroi 16 du boîtier 8, et plus particulièrement à travers l'orifice 17, de sorte que, d'une part, les moyens de liaison 35 sont disposés à l'intérieur d'un espace vide 48 délimité dans l'épaisseur de la région coudée 13 du boîtier 8 et, d'autre part, la paroi 16 forme un logement 49 de réception des pattes 46. Plus précisément, une extrémité 50 des pattes 46 est en appui radial contre la paroi 16 au niveau du logement 49. En pratique, à l'état assemblé de la vanne V1 , l'enveloppe 33 se retrouve liée fixement au boîtier 8, par maintien en appui radial des pattes 46 contre la paroi 16 du boîtier 8, et sous l'action du ressort 21 après assemblage de ce dernier au boîtier 8 grâce à l'armature 22. En outre, l'extrémité 50 de chaque patte 46 est également en appui axial contre la paroi 16, car les extrémités 50, généralement métalliques, ont tendance à s'insérer dans la matière, généralement plastique, formant le boîtier 8. In the assembled state of the valve V1, the connecting means 35 emerging outside the casing 33 are arranged axially through the wall 16 of the casing 8, and more particularly through the orifice 17, so that that, on the one hand, the connecting means 35 are arranged inside a void space 48 delimited in the thickness of the bent region 13 of the casing 8 and, on the other hand, the wall 16 forms a housing 49 to receive the tabs 46. More specifically, one end 50 of the tabs 46 bears radially against the wall 16 at the housing 49. In practice, in the assembled state of the valve V1, the envelope 33 is found bound fixed to the casing 8, by maintaining radial support of the tabs 46 against the wall 16 of the casing 8, and under the action of the spring 21 after assembly from the latter to the housing 8 through the frame 22. In addition, the end 50 of each lug 46 is also axially against the wall 16, since the ends 50, generally metallic, tend to fit into the material, generally plastic, forming the casing 8.
Les pattes élastiques 46 améliorent la fixation de l'enveloppe 33 sur le boîtier 8, par effet de résilience. Comme bien visible sur les figures 2 à 4, les pattes élastiques 46 sont, dans l'exemple de réalisation considéré, de forme globalement trapézoïdale et orientées vers la première partie terminale 33.1 . Les pattes 46 sont réparties autour de la périphérie extérieure de la collerette 44. Avantageusement, les pattes 46 définissent, entre deux pattes 46 se succédant autour de l'axe X-X, au moins un cran non occupé par l'une des pattes élastiques 46. On comprend que ce cran forme un repère d'indexage angulaire autour de l'axe X-X, de l'enveloppe 33, facilitant ainsi l'assemblage de la cartouche chauffante C1 équipée de cette enveloppe 33 au sein d'une vanne thermostatique similaire à la vanne V1 .  The elastic tabs 46 improve the attachment of the casing 33 to the casing 8, by resilience effect. As clearly visible in FIGS. 2 to 4, the elastic tabs 46 are, in the embodiment considered, of generally trapezoidal shape and oriented towards the first end portion 33.1. The tabs 46 are distributed around the outer periphery of the collar 44. Advantageously, the tabs 46 define, between two tabs 46 succeeding each other around the axis XX, at least one notch not occupied by one of the elastic tabs 46. It will be understood that this notch forms an angular indexing mark around the axis XX, of the envelope 33, thus facilitating the assembly of the heating cartridge C1 equipped with this envelope 33 within a thermostatic valve similar to the valve V1.
Avantageusement, comme bien visible sur les figures 3 et 4, un joint d'étanchéité Advantageously, as clearly visible in FIGS. 3 and 4, a seal
52 est agencé radialement dans un deuxième logement 54 de réception, formé par la paroi 16, entre la petite base circulaire 42 et la première partie terminale 33.1 . Le joint d'étanchéité 52 est centré sur l'axe longitudinal X-X et positionné autour de l'enveloppe tubulaire 33. Ainsi, ce joint 52 est avantageusement prévu pour occuper et étancher l'espace vide 48, comprenant les moyens de liaison 35, vis-à-vis du fluide circulant dans la cavité 14. 52 is arranged radially in a second receiving housing 54, formed by the wall 16, between the small circular base 42 and the first end portion 33.1. The seal 52 is centered on the longitudinal axis XX and positioned around the tubular casing 33. Thus, this seal 52 is advantageously provided for occupying and sealing the empty space 48, comprising the connecting means 35, screws with the fluid circulating in the cavity 14.
En variante non représentée, le joint d'étanchéité 52 est remplacé par un autre moyen d'étanchéité fonctionnellement similaire, tel qu'une colle ou une pâte d'étanchéité.  In variant not shown, the seal 52 is replaced by another functionally similar sealing means, such as an adhesive or a sealing paste.
A l'état assemblé de la vanne V1 , les moyens de liaison électrique 35 sont, à l'intérieur de l'espace vide précité 48, respectivement connectés électriquement à une source d'alimentation externe, non représentée, propre à commander le courant traversant la résistance 34, et donc l'augmentation ou la diminution de la température de la matière thermodilatable 32. Les moyens de liaison 35 sont connectés à la source d'alimentation externe via un connecteur accessible sur une face extérieure du boîtier 8.  In the assembled state of the valve V1, the electrical connection means 35 are, within the aforementioned empty space 48, respectively electrically connected to an external power source, not shown, suitable for controlling the current flowing through. the resistor 34, and therefore the increase or decrease of the temperature of the heat-transferable material 32. The connecting means 35 are connected to the external power source via a connector accessible on an outer face of the housing 8.
Par ailleurs, à l'état assemblé de la vanne V1 , une extrémité 60 de l'enveloppe 33, la plus éloignée de la première partie terminale 33.1 , suivant l'axe longitudinal X-X, est en butée contre une butée verticale 62 formée par la paroi 16 et qui s'étend radialement à l'axe X-X.  Furthermore, in the assembled state of the valve V1, an end 60 of the casing 33, furthest from the first end portion 33.1, along the longitudinal axis XX, abuts against a vertical stop 62 formed by the wall 16 and which extends radially to the axis XX.
De plus, un procédé d'assemblage de la cartouche chauffante C1 dans la vanne V1 comprend différentes étapes. Une première étape consiste en la fabrication de l'enveloppe tubulaire 33, de préférence par emboutissage, la surface interne tronconique S38 étant facile à fabriquer par emboutissage. Lors d'une étape suivante, le boîtier 8 est moulé de manière à ce qu'il comprenne la cavité interne 14 et la paroi 16, qui forme autour de l'orifice 17 la surface tronconique S16. Puis, la cartouche C1 est insérée dans l'orifice 17, avec la surface interne S38 qui vient se coincer autour de la surface S16, via un effort E1 de pression exercé suivant l'axe central X-X en direction de l'orifice 17. In addition, a method of assembling the heating cartridge C1 in the valve V1 comprises different steps. A first step is the production of the tubular casing 33, preferably by stamping, the frustoconical inner surface S38 being easy to manufacture by stamping. In a next step, the housing 8 is molded so that it comprises the internal cavity 14 and the wall 16, which forms around the orifice 17 the frustoconical surface S16. Then, the cartridge C1 is inserted in the orifice 17, with the internal surface S38 which is jammed around the surface S16, via a force E1 pressure exerted along the central axis XX towards the orifice 17.
En complément, l'effort de pression E1 est exercé jusqu'à ce que l'extrémité 60 de l'enveloppe 33, la plus éloignée de la première partie 33.1 , suivant l'axe longitudinal X-X, soit en butée, suivant l'axe longitudinal X-X, contre la paroi 16 au niveau de la butée verticale 62.  In addition, the pressure force E1 is exerted until the end 60 of the casing 33, furthest from the first part 33.1, along the longitudinal axis XX, is in abutment along the axis longitudinal XX, against the wall 16 at the vertical stop 62.
Lors de l'étape d'insertion de la cartouche C1 dans l'orifice 17, la paroi 16 exerce un effort de compression sur les pattes 46 afin de les déformer radialement à l'axe longitudinal X-X. En effet le diamètre du premier logement 49, mesuré suivant une direction radial à l'axe central X-X, est inférieur au diamètre de la collerette 44, les pattes 46 sont donc, lors de l'insertion de la cartouche C1 dans l'orifice 17, déformés par la paroi 16 au niveau du premier logement 49 et l'extrémité 50 de chaque patte 46 est en appui radial contre la paroi 16. Enfin, au niveau du premier logement 49, les pattes 46 viennent généralement s'insérer dans le plastique du boîtier 8 de la paroi 16 et sont donc en appui radial mais aussi axial contre la paroi 16.  During the step of inserting the cartridge C1 in the orifice 17, the wall 16 exerts a compressive force on the tabs 46 in order to deform them radially to the longitudinal axis X-X. Indeed the diameter of the first housing 49, measured in a radial direction to the central axis XX, is smaller than the diameter of the flange 44, the tabs 46 are therefore, during the insertion of the cartridge C1 in the orifice 17 , deformed by the wall 16 at the first housing 49 and the end 50 of each lug 46 is in radial abutment against the wall 16. Finally, at the first housing 49, the lugs 46 are generally inserted into the plastic of the housing 8 of the wall 16 and are therefore in radial but also axial bearing against the wall 16.
De plus, suite à l'insertion de la cartouche C1 dans l'orifice 17, la cartouche C1 est fixée au boîtier 8 et immobilisée par rapport au boîtier 8. Puis, le joint 52 est inséré suivant l'axe longitudinal X-X autour de l'enveloppe 33, jusqu'à ce qu'il soit positionné dans le deuxième logement 54.  In addition, following the insertion of the cartridge C1 into the orifice 17, the cartridge C1 is fixed to the housing 8 and immobilized relative to the housing 8. Then, the seal 52 is inserted along the longitudinal axis XX around the envelope 33, until it is positioned in the second housing 54.
Enfin après l'insertion du joint 52, la coupelle 31 peut être positionné de manière à ce que la première partie terminale 33.1 soit plongée dans la matière thermodilatable. Puis, le ressort de rappel 21 est installé entre le clapet 18 et l'armature rigide 22 solidaire du boîtier 8, afin de maintenir en place le système, c'est-à-dire de maintenir en position la cartouche C1 et d'influer sur la position du clapet 18 et de la coupelle 31 .  Finally after the insertion of the seal 52, the cup 31 can be positioned so that the first end portion 33.1 is immersed in the thermally expandable material. Then, the return spring 21 is installed between the valve 18 and the rigid armature 22 integral with the casing 8, in order to hold the system in place, that is to say to maintain in position the cartridge C1 and to influence on the position of the valve 18 and the cup 31.
Ainsi, la fixation de l'enveloppe 33 au boîtier 8 est optimisée grâce au coincement de la surface interne S38 autour de la surface S16 et aux pattes 46 qui sont en appui radial et axial contre la paroi 16. La forme tronconique des surfaces S38 et S16, respectivement interne et autour de l'orifice 17, permet de bien centrer l'enveloppe 33, et donc la cartouche chauffante C1 par rapport au boîtier 8 et à l'orifice 17, ainsi que de favoriser la fixation de l'enveloppe 33 au boîtier 8 par effet de coincement. De plus, la forme tronconique des surfaces S38 et S16 favorise également la répartition des efforts axiaux, suivant l'axe longitudinal X-X, au niveau de la paroi 16 et plus précisément de la surface S16, ce qui permet une bonne tenue à des efforts axiaux, par exemple subits par la cartouche C1 lorsque la coupelle 31 correspondante se déplace vers l'orifice 17 ou à l'opposé de l'orifice 17, suivant l'axe longitudinal X-X. Les contraintes mécaniques subits par le boîtier 8 sont donc mieux réparties et absorbées et le boîtier 8 conserve sa forme, ce qui garantit une bonne étanchéité entre la cavité 14 et les moyens de liaison électrique 35. De plus, la forme tronconique de la surface interne S38 favorise la fabrication de la cartouche C1 par emboutissage. Thus, the fixing of the casing 33 to the casing 8 is optimized thanks to the jamming of the internal surface S38 around the surface S16 and to the lugs 46 which bear radial and axial bearing against the wall 16. The frustoconical shape of the surfaces S38 and S16, respectively internal and around the orifice 17, makes it possible to properly center the casing 33, and therefore the heating cartridge C1 relative to the casing 8 and to the orifice 17, as well as to favor the attachment of the casing 33 to the casing 8 by jamming effect. In addition, the frustoconical shape of the surfaces S38 and S16 also favors the distribution of the forces axial, along the longitudinal axis XX, at the wall 16 and more precisely the surface S16, which allows a good resistance to axial forces, for example undergone by the cartridge C1 when the cup 31 corresponding moves towards the orifice 17 or opposite the orifice 17 along the longitudinal axis XX. The mechanical stresses experienced by the casing 8 are therefore better distributed and absorbed and the casing 8 retains its shape, which guarantees a good seal between the cavity 14 and the electrical connection means 35. In addition, the frustoconical shape of the internal surface S38 promotes the manufacture of the cartridge C1 by stamping.
Par ailleurs, l'extrémité 50 de chaque patte 46 est en appui radial contre la paroi 16, ce qui améliore la fixation de l'enveloppe 33 au boîtier 8, puisque chaque extrémité 50 des pattes 46 exerce un effort radialement à l'axe central X-X, en direction de l'axe central X-X.  Furthermore, the end 50 of each lug 46 bears radially against the wall 16, which improves the attachment of the casing 33 to the casing 8, since each end 50 of the lugs 46 exerts a force radially to the central axis XX, towards the central axis XX.
Une fois que la cartouche C1 est fixée au boîtier 8, les pattes 46 et plus précisément l'extrémité 50 de chaque patte est enferré dans la matière du boîtier 8 et de la paroi 16, ce qui améliore la fixation de l'enveloppe 33 au boîtier 8 et favorise encore l'étanchéité entre la cavité 14 et les moyens de liaison électrique 35.  Once the cartridge C1 is fixed to the housing 8, the tabs 46 and more precisely the end 50 of each tab is locked in the material of the housing 8 and the wall 16, which improves the attachment of the envelope 33 to housing 8 and further promotes sealing between the cavity 14 and the electrical connection means 35.
Par ailleurs, la distance radiale, par rapport à l'axe X-X, sur laquelle s'étend chaque patte 46 est comprise entre 1 10% et 150% du diamètre de la grande base circulaire de la surface S16, ce qui garantit un encombrement limité des pattes 46 dans la vanne V1 . De plus, sachant que l'extrémité 50 de chaque patte 46 est enferrée dans la matière de la paroi 16, une fois la cartouche C1 fixée au boîtier 8, la cartouche C1 est indémontable vis-à-vis du boîtier 8, l'étanchéité est donc toujours garantit, puisque la cartouche ne peut être séparée du boîtier 8 et qu'aucun opérateur ne peut démonter la cartouche C1 de la vanne V1 , puis la réinsérer de manière incorrecte dans l'orifice 17.  Furthermore, the radial distance, relative to the axis XX, on which each lug 46 extends is between 10% and 150% of the diameter of the large circular base of the surface S16, which guarantees a limited space requirement. tabs 46 in the valve V1. In addition, knowing that the end 50 of each tab 46 is locked in the material of the wall 16, once the cartridge C1 attached to the housing 8, the cartridge C1 is not removable vis-à-vis the housing 8, the seal is therefore always guaranteed, since the cartridge can not be separated from the housing 8 and no operator can disassemble the cartridge C1 of the valve V1, then reinsert it incorrectly into the orifice 17.
Enfin, en plus de tout ce qui précède, divers aménagements et variantes à la cartouche chauffante C1 ainsi qu'à la vanne thermostatiques V1 décrites jusqu'ici sont par ailleurs envisageables. A titre d'exemples :  Finally, in addition to all the above, various arrangements and variants of the heating cartridge C1 and the thermostatic valve V1 described so far are also possible. As examples:
- les aménagements spécifiques de l'un ou l'autre des modes ou formes de réalisation, décrits ci-dessus, peuvent être combinés, dans la mesure d'une faisabilité technique, avec un autre mode ou forme de réalisation, pour obtenir des modes ou formes de réalisation « hybrides » ; et/ou  the specific arrangements of one or other of the modes or embodiments described above may be combined, to the extent of a technical feasibility, with another embodiment or embodiment, to obtain modes or "hybrid" embodiments; and or
- dans les exemples de réalisation considérés jusqu'ici, l'enveloppe externe de la cartouche chauffante, dans laquelle est agencée, entre autres, la résistance électrique chauffante de cette cartouche, constitue le piston de l'élément thermostatique correspondant ; toutefois, pour d'autres géométries de construction de vanne thermostatique, cette enveloppe de la cartouche chauffante et le piston de l'élément thermostatique, dont la matière thermodilatable est chauffée par la résistance chauffante appartenant à la cartouche, peuvent consister en deux pièces distinctes ; dans ce cas, généralement, l'enveloppe externe de la cartouche chauffante s'étend à travers le fond de la coupelle de l'élément thermostatique, à l'opposé du piston de cet élément thermostatique, la coupelle étant alors fixe par rapport au boîtier de la vanne, tandis que le piston de l'élément thermostatique porte un obturateur pour commander l'ouverture et la fermeture de ce dernier vis-à-vis du boîtier. - In the embodiments so far considered, the outer shell of the heating cartridge, which is arranged, among others, the heating electric resistance of the cartridge, is the piston of the corresponding thermostatic element; however, for other valve construction geometries thermostatic, this envelope of the heating cartridge and the piston of the thermostatic element, whose thermodilatable material is heated by the heating resistor belonging to the cartridge, may consist of two separate parts; in this case, generally, the outer shell of the heating cartridge extends through the bottom of the cup of the thermostatic element, opposite the piston of this thermostatic element, the cup then being fixed relative to the housing of the valve, while the piston of the thermostatic element carries a shutter to control the opening and closing of the latter vis-à-vis the housing.

Claims

REVENDICATIONS
1 .- Cartouche chauffante (C1 ) pour un élément thermostatique (10), comprenant : une enveloppe tubulaire (33) thermiquement conductrice qui s'étend suivant un axe longitudinal (X-X) et dont une première partie terminale (33.1 ) est adaptée pour être plongée dans une matière thermodilatable (32) de l'élément thermostatique (10), une résistance électrique (34) chauffante, agencée à l'intérieur de la première partie terminale (33.1 ) de l'enveloppe (33), et 1 .- Heating cartridge (C1) for a thermostatic element (10), comprising: a thermally conductive tubular casing (33) which extends along a longitudinal axis (XX) and of which a first end portion (33.1) is adapted to be dipped in a thermally expandable material (32) of the thermostatic element (10), a heating resistor (34) arranged inside the first end portion (33.1) of the casing (33), and
des moyens (35) de liaison électrique propres à alimenter en courant la résistance électrique (34) et débouchant vers l'extérieur de l'enveloppe tubulaire (33) via une seconde partie terminale (33.2) de l'enveloppe tubulaire (33), qui est, suivant l'axe longitudinale (X-X), opposée à la première partie terminale (33.1 ),  electrical connection means (35) adapted to supply current to the electrical resistance (34) and opening towards the outside of the tubular envelope (33) via a second end portion (33.2) of the tubular envelope (33), which, along the longitudinal axis (XX), is opposite the first end portion (33.1),
caractérisée en ce que la seconde partie terminale (33.2) comprend une portion tronconique (38), qui est centrée sur l'axe longitudinal (X-X) et qui est convergente en direction de la première partie terminale (33.1 ), et en ce que la seconde partie terminale (33.2) comprend, en outre, une collerette d'appui mécanique (44), qui dans une direction opposée à la première partie terminale (33.1 ) prolonge la portion tronconique (38) et qui est munie d'au moins une patte élastique (46) de fixation. characterized in that the second end portion (33.2) comprises a frustoconical portion (38), which is centered on the longitudinal axis (XX) and which converges toward the first end portion (33.1), and that the second end portion (33.2) further comprises a mechanical support collar (44), which in a direction opposite the first end portion (33.1) extends the frusto-conical portion (38) and which is provided with at least one elastic tab (46) for fixing.
2.- Cartouche selon la revendication 1 , caractérisée en ce que le diamètre (D40) de la grande base circulaire (40) de la portion tronconique (38) est compris entre 120% et 500%, de préférence entre 150% et 300%, du diamètre (D42) de la petite base circulaire (42) de la portion tronconique (38). 2. A cartridge according to claim 1, characterized in that the diameter (D40) of the large circular base (40) of the frustoconical portion (38) is between 120% and 500%, preferably between 150% and 300% , the diameter (D42) of the small circular base (42) of the frustoconical portion (38).
3.- Cartouche selon l'une des revendications précédentes, caractérisée en ce que la hauteur (H38) de la portion tronconique (38), mesurée parallèlement à l'axe longitudinal (X-X), est comprise entre 2% et 10%, de préférence entre 3% et 7%, de la hauteur (H33) de l'enveloppe tubulaire (33), mesurée parallèlement à l'axe longitudinal (X-X). 3. Cartridge according to one of the preceding claims, characterized in that the height (H38) of the frustoconical portion (38), measured parallel to the longitudinal axis (XX), is between 2% and 10%, preferably between 3% and 7%, of the height (H33) of the tubular casing (33), measured parallel to the longitudinal axis (XX).
4.- Cartouche selon l'une des revendications précédentes, caractérisée en ce que le diamètre (D42) de la petite base circulaire (42) est égal au diamètre (D33.1 ) de la première partie terminale (33.1 ). 4. Cartridge according to one of the preceding claims, characterized in that the diameter (D42) of the small circular base (42) is equal to the diameter (D33.1) of the first end portion (33.1).
5. -Elément thermostatique (10), caractérisé en ce qu'il comprend une cartouche chauffante (C1 ) conforme à l'une quelconque des revendications précédentes et une coupelle (31 ) contenant une matière thermodilatable (32) dans laquelle est plongée la première partie terminale (33.1 ) de l'enveloppe (33) de la cartouche chauffante (C1 ). 5. Thermostatic element (10), characterized in that it comprises a heating cartridge (C1) according to any one of the preceding claims and a cup (31) containing a thermally expandable material (32) in which is immersed the first end portion (33.1) of the casing (33) of the heating cartridge (C1).
6. - Vanne thermostatique (V1 ), comportant un boîtier (8) et un élément thermostatique (10), caractérisée en ce que l'élément thermostatique (10) est conforme à la revendication 5, en ce que le boîtier (8) comprend une cavité interne (14) dans laquelle un fluide est propre à circuler, et une paroi (16) qui ferme la cavité interne (14) et est munie d'un orifice (17) propre à recevoir les moyens de liaison électrique (35), en ce que la paroi (16) forme autour de l'orifice (17) une surface (S16) tronconique, centrée sur un axe central (X-X) de l'orifice (17), la surface tronconique (S16) autour de l'orifice (17) étant de forme complémentaire d'une surface interne tronconique (S38) de la portion tronconique (38), la surface interne tronconique (S38) étant coincée par complémentarité de formes autour de la surface tronconique (S16), qui est autour de l'orifice (17), suivant l'axe central (X-X). 6. - thermostatic valve (V1), comprising a housing (8) and a thermostatic element (10), characterized in that the thermostatic element (10) according to claim 5, in that the housing (8) comprises an internal cavity (14) in which a fluid is adapted to circulate, and a wall (16) which closes the internal cavity (14) and is provided with an orifice (17) capable of receiving the electrical connection means (35) , in that the wall (16) forms around the orifice (17) a frustoconical surface (S16), centered on a central axis (XX) of the orifice (17), the frustoconical surface (S16) around the orifice (17) being of complementary shape to a frustoconical internal surface (S38) of the frustoconical portion (38), the frustoconical inner surface (S38) being wedged by complementarity of shapes around the frustoconical surface (S16), which is around the orifice (17) along the central axis (XX).
7. - Vanne thermostatique selon la revendication 6, caractérisée en ce que la cartouche chauffante (C1 ) de l'élément thermostatique (10) est selon l'une quelconque des revendications 1 à 4, et en ce que la paroi (16) forme un premier logement (49) de réception de la ou des pattes (46), et en ce qu'une extrémité (50) de la ou des pattes est en appui radial contre la paroi (16) au niveau de ce premier logement (49). 7. - thermostatic valve according to claim 6, characterized in that the heating cartridge (C1) of the thermostatic element (10) is according to any one of claims 1 to 4, and in that the wall (16) forms a first housing (49) for receiving the one or more lugs (46), and in that one end (50) of the one or more lugs bears radially against the wall (16) at the level of this first housing (49); ).
8. - Vanne selon la revendication 7, caractérisée en ce que la paroi (16) forme entre la petite base circulaire (42) et la première partie terminale (33.1 ) un deuxième logement (54) de réception d'un joint d'étanchéité (52) circulaire, le joint circulaire étant disposé dans le deuxième logement (54), centré sur l'axe longitudinal (X-X) et positionné autour de l'enveloppe tubulaire (33). 8. - valve according to claim 7, characterized in that the wall (16) forms between the small circular base (42) and the first end portion (33.1) a second housing (54) for receiving a seal (52) circular, the circular seal being disposed in the second housing (54), centered on the longitudinal axis (XX) and positioned around the tubular casing (33).
9.- Procédé d'assemblage d'une cartouche chauffante (C1 ) dans une vanne (V1 ), la cartouche chauffante (C1 ) comprenant : 9. A method of assembling a heating cartridge (C1) in a valve (V1), the heating cartridge (C1) comprising:
une enveloppe tubulaire (33) thermiquement conductrice qui s'étend suivant un axe longitudinal (X-X) et dont une première partie terminale (33.1 ) est adaptée pour être plongée dans une matière thermodilatable (32) de l'élément thermostatique (10), une résistance électrique (34) chauffante, agencée à l'intérieur de la première partie terminale (33.1 ) de l'enveloppe (33), et a thermally conductive tubular casing (33) extending along a longitudinal axis (XX) and a first end portion (33.1) of which is adapted to be immersed in a thermally expandable material (32) of the thermostatic element (10), a heating resistor (34) arranged inside the first end portion (33.1) of the casing (33), and
des moyens (35) de liaison électrique propres à alimenter en courant la résistance électrique (34) et débouchant vers l'extérieur de l'enveloppe tubulaire (33) via une seconde partie terminale (33.2) de l'enveloppe tubulaire (33), qui est, suivant l'axe longitudinale (X-X), opposée à la première partie terminale (33.1 ),  electrical connection means (35) adapted to supply current to the electrical resistance (34) and opening towards the outside of the tubular envelope (33) via a second end portion (33.2) of the tubular envelope (33), which, along the longitudinal axis (XX), is opposite the first end portion (33.1),
caractérisé en ce que le procédé comprend les étapes suivantes :  characterized in that the method comprises the following steps:
-a) la fabrication de l'enveloppe tubulaire (33), la seconde partie terminale (33.2) comprenant une portion tronconique (38) qui comporte une surface (S38) interne tronconique,  -a) the manufacture of the tubular casing (33), the second end portion (33.2) comprising a frustoconical portion (38) which has a frustoconical internal surface (S38),
- b) le moulage d'un boîtier (8) comprenant une cavité interne (14) et une paroi (16), qui ferme la cavité interne (14) et est muni d'un orifice (17), la paroi (16) formant suivant un axe central (X-X) de l'orifice (17), autour de l'orifice (17), une surface (S16) tronconique de forme complémentaire de la surface interne tronconique (S38) de la portion tronconique (38),  b) molding a housing (8) comprising an internal cavity (14) and a wall (16), which closes the internal cavity (14) and is provided with an orifice (17), the wall (16) forming, along a central axis (XX) of the orifice (17), around the orifice (17), a frustoconical surface (S16) of complementary shape to the frustoconical internal surface (S38) of the frustoconical portion (38),
- c) l'insertion de la cartouche (C1 ) dans l'orifice (17), la surface interne tronconique (S38) venant se coincer autour de la surface tronconique (S16), qui est autour de l'orifice (17), via un effort (E1 ) de pression exercé, suivant l'axe central (X-X), en direction de l'orifice (17).  - c) inserting the cartridge (C1) in the orifice (17), the frustoconical inner surface (S38) being wedged around the frustoconical surface (S16), which is around the orifice (17), via a force (E1) exerted along the central axis (XX) in the direction of the orifice (17).
PCT/EP2014/069193 2013-09-09 2014-09-09 Cartridge heater, thermostatic element comprising such a cartridge, thermostatic valve including such a thermostatic element, and method for assembling such a cartridge in such a valve WO2015032978A1 (en)

Applications Claiming Priority (2)

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FR1358637 2013-09-09
FR1358637A FR3010478B1 (en) 2013-09-09 2013-09-09 HEATABLE CARTRIDGE, THERMOSTATIC ELEMENT COMPRISING SUCH A CARTRIDGE, THERMOSTATIC VALVE COMPRISING SUCH A THERMOSTATIC ELEMENT, METHOD FOR ASSEMBLING SUCH A CARTRIDGE IN SUCH A VALVE

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114623059A (en) * 2022-03-25 2022-06-14 湖北宏盛昌电子有限责任公司 High leakproofness wax motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060006247A1 (en) * 2004-07-12 2006-01-12 Jean-Michel Roman Thermostatic valve for a cooling circuit
US20100230504A1 (en) * 2009-03-11 2010-09-16 Vernet Heating cartridge for thermostatic element and method for manufacturing same, as well as thermostatic valve comprising such a cartridge
DE202009018408U1 (en) * 2009-10-23 2011-09-29 Gustav Wahler Gmbh U. Co. Kg thermostatic valve
WO2012013896A1 (en) * 2010-07-29 2012-02-02 Vernet Heating cartridge, and thermostatic element comprising such a cartridge
WO2012013897A1 (en) * 2010-07-29 2012-02-02 Vernet Thermostatic valve comprising a heating cartridge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060006247A1 (en) * 2004-07-12 2006-01-12 Jean-Michel Roman Thermostatic valve for a cooling circuit
US20100230504A1 (en) * 2009-03-11 2010-09-16 Vernet Heating cartridge for thermostatic element and method for manufacturing same, as well as thermostatic valve comprising such a cartridge
DE202009018408U1 (en) * 2009-10-23 2011-09-29 Gustav Wahler Gmbh U. Co. Kg thermostatic valve
WO2012013896A1 (en) * 2010-07-29 2012-02-02 Vernet Heating cartridge, and thermostatic element comprising such a cartridge
WO2012013897A1 (en) * 2010-07-29 2012-02-02 Vernet Thermostatic valve comprising a heating cartridge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114623059A (en) * 2022-03-25 2022-06-14 湖北宏盛昌电子有限责任公司 High leakproofness wax motor

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FR3010478B1 (en) 2016-03-11

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