WO2020012086A1 - Bevel-ribbed electrical airflow heating device for a vehicle - Google Patents

Bevel-ribbed electrical airflow heating device for a vehicle Download PDF

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Publication number
WO2020012086A1
WO2020012086A1 PCT/FR2019/051604 FR2019051604W WO2020012086A1 WO 2020012086 A1 WO2020012086 A1 WO 2020012086A1 FR 2019051604 W FR2019051604 W FR 2019051604W WO 2020012086 A1 WO2020012086 A1 WO 2020012086A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
rib
upright
housing
heating element
Prior art date
Application number
PCT/FR2019/051604
Other languages
French (fr)
Inventor
Frédéric PIERRON
Rawane Seck
Serif KARAASLAN
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2020012086A1 publication Critical patent/WO2020012086A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
    • B60H1/2225—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters arrangements of electric heaters for heating air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • F24H3/0435—Structures comprising heat spreading elements in the form of fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0429—For vehicles
    • F24H3/0452—Frame constructions
    • F24H3/0458—One-piece frames
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material
    • H05B2203/023—Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system

Definitions

  • the field of the present invention is that of heat exchangers such as electric heating devices for vehicles.
  • the invention applies more particularly to ventilation, heating, and / or air conditioning installations of motor vehicles comprising such devices making it possible to heat an air flow.
  • HVAC installation a ventilation, heating, and / or air conditioning installation otherwise called HVAC installation, for the acronym "Heating, Ventilating and Air-Conditioning" where the electric heating device is housed, or in margin of the HVAC installation with an electric heating device placed in addition to this installation. Thanks to the electric heater, the air flow is brought to a temperature sufficient to heat the passenger compartment.
  • the electric heating device comprises a frame, in which are housed heating elements supplied electrically via a suitable connector at the periphery of said frame.
  • the frame serves as a support for the heating elements and the associated electrical connections, and it also allows the electric heating device to be fixed to the vehicle, for example within the vehicle's HVAC installation.
  • the heating elements consist of metal fins that thermally collect and conduct the heat generated by resistive elements formed by ceramic stones with PTC effect, an acronym for the expression "Positive Temperature Coefficient".
  • the elements with PTC effect generate heat under the effect of an appropriate electrical supply and the metal fins forming radiant elements restore this heat to the air flow circulating in contact with them, so that at the outlet of the heating device electric in operation, the air flow is hotter than it came in.
  • ceramic stones with PTC effect have a surface heat of up to 150 ° C to 170 ° C, the metal fins forming associated radiant elements being able to be brought to a temperature of 5 to 10 ° C less than that of PTC effect stones.
  • the frame and the heating elements which it contains are dimensioned so as to reduce their size.
  • the heating elements are arranged in a housing formed in the frame and occupy all the space there.
  • This optimization of space is detrimental to assembly: in fact the metal fins constituting the heating elements are deformable and when they are slid into their housing, these metal fins are liable to deform if they strike their frame.
  • the deformation or breakage of the metal fins is detrimental to the heat exchange performance of the electric radiator.
  • the object of the present invention is therefore to solve the drawbacks described above by designing an electric heating device, the mounting of which is facilitated and compatible with an optimization of the dimensioning of the heating elements relative to their housing in order to improve the space requirement.
  • the HVAC installation box in which it is integrated.
  • the subject of the invention is therefore an electric heating device frame configured to heat a flow of air circulating in a vehicle ventilation, heating and / or air conditioning installation box, the frame extending along a plane.
  • main longitudinal elongation and comprising at least one housing extending along a longitudinal axis and being intended to accommodate at least one heating element, the frame comprising two perforated faces, a first longitudinal end allowing the insertion of the heating element in the housing and a second longitudinal end opposite the first longitudinal end, at least one rib with an internal face oriented towards the housing of the frame and an external face opposite to the internal face, the internal face of the rib being connected to the external face of the rib by a leading edge oriented towards the first longitudinal end of the frame and a border opposite the leading edge aque, characterized in that the leading edge of the rib has a bevel forming an inclined ramp towards the housing of the heating element.
  • the frame has openwork faces revealing the heating element that it houses and allowing the passage of the air flow to be heated through the frame.
  • the air flow thus follows a transverse trajectory passing through the electric heating device, the transverse trajectory being generally perpendicular or substantially perpendicular to the main longitudinal elongation plane of the frame.
  • the air flow thus enters through one of the faces of the frame, passes through the heating element and recovers calories in contact with the radiant elements, if the heating element is electrically supplied, then exits through the other face of the frame.
  • the heating element is inserted into the housing according to the main extension plan of the frame in the direction of the extension axis of the housing which receives it.
  • One of the ends of the frame here the first longitudinal end, is intended for the insertion of the heating element.
  • the first longitudinal end of the frame is thus open, while the second longitudinal end of the frame can be closed.
  • the rib present on the frame makes it possible to stiffen the latter, which can be weakened by the presence of the perforated faces allowing the air flow to pass.
  • a plurality of ribs is distributed over the two openwork faces of the frame. Their distribution is more advantageously homogeneous to stiffen the frame over its entire structure.
  • the rib is provided with a beveled leading edge, inclined so as to form a ramp.
  • the ramp is inclined so that the leading edge is closer to the first longitudinal end on the side of the external face relative to the internal face.
  • the leading edge is the edge of the rib connecting the first upright of the frame and the second upright of the frame while facing the heating element being inserted during the mounting operation.
  • the bevel can form a first slope and a second slope on the leading edge. At least one of the slopes corresponds to the previously described ramp, being inclined towards the housing of the frame. In this way, the bevel provides the leading edge of the rib with an arrow shape with the point formed by the junction edge of the two slopes.
  • the first slope can be inclined towards the housing of the frame and the second slope can be inclined towards the external face of the rib.
  • the first slope can occupy most of the leading edge so that a junction line of the slopes is closer to the outer face of the rib than of the inner side of the rib. The first slope is thus the main slope of the leading edge.
  • the bevel helps in mounting the heating element. Indeed, the heating element, when it is inserted in its housing, can be brought to meet the leading edge of the rib. When the leading edge and the heating element meet, the heating element slides on the leading edge due to its beveled conformation. Thanks to the bevel and its inclined ramp towards the housing, the heating element continues to progress within the housing along the longitudinal axis of the housing without clinging to the rib, immobilizing it or being damaged therein. Such a leading edge thus promotes the correct positioning of the heating element by improving the insertion of the heating element into the housing and minimizing the risk of collision and deterioration of the heating element during its insertion.
  • the frame is a one-piece assembly.
  • the rib can only be dissociated from the other elements of the frame by deteriorating its structure.
  • the frame is obtained by molding at least one synthetic material.
  • the material is a composite plastic material, such as polybutylene terephthalate with fiberglass (PBT-GF) or glass fiber reinforced polyamide (for example PA 66-GF30).
  • the housing is bordered laterally by a first upright of the frame and by a second upright of the frame, the first upright and the second upright being substantially parallel to the longitudinal axis, the rib comprising a central part, a first lateral part connected to the central part and to the first upright of the frame and a second lateral part connected to the central part and to the second upright of the frame, the bevel forming an inclined slope of a first angle value in the central part and a second angle value in the first side part and the second side part.
  • laterally is meant a direction perpendicular to the previously defined longitudinal and transverse directions.
  • Fe first upright of the frame and the second upright of the frame, just like the rib and its central part, its first lateral part and its second lateral part, are part of the one-piece structure of the frame.
  • the central part of the rib is dedicated to stiffening the frame. It extends between the first lateral part and the second lateral part, through the openwork face of the frame on the air flow path.
  • the central part is bevelled at the leading edge according to the first angle value.
  • the first lateral part and the second lateral part of the rib serve to connect the central part of the rib respectively to the first upright and to the second upright of the frame.
  • at least one lateral part is bevelled according to a second angle value different from the first angle value corresponding to the central part.
  • the first lateral part and the second lateral part have a greater longitudinal dimension than a longitudinal dimension of the central part.
  • the longitudinal dimension is measured along the longitudinal axis of the housing between the leading edge and the edge of the rib. This greater longitudinal dimension for the lateral parts ensures a solid connection of the rib on the frame.
  • the first side part and the second side part are narrower than the central part.
  • the width is measured perpendicular to the longitudinal axis of the housing, between the first upright and the central part for the first lateral part, between the second upright and the central part for the second lateral part and between the first lateral part and the second part lateral for the central part.
  • the central part is the part of the rib mainly exposed to the air flow.
  • the first angle value is defined by the leading edge and the outer face.
  • the first angle value is defined by the first slope of the leading edge and the second slope of the leading edge.
  • the second angle value is defined by the leading edge and the outer face.
  • the second angle value is defined by the first slope of the leading edge and the second slope of the leading edge.
  • the first slope occupies most of the leading edge so that a junction line of the slopes is closer to the outer face of the rib only from the inner side of the rib.
  • the first angle value is less than 180 °.
  • the first angle value is less than or equal to 90 °.
  • the first angle value is less than or equal to 45 °.
  • the second angle value is less than 180 °.
  • the second angle value is less than or equal to 90 °.
  • the second angle value is less than or equal to 45 °.
  • the first angle value is constant from the first lateral part to the second lateral part, that is to say constant from one lateral end to the other of the central part.
  • the second angle value is constant from the first upright towards the central part, i.e. constant from one lateral end to the other of the first lateral part, and from the second upright towards the central part , that is to say constant from one lateral end to the other of the first lateral part.
  • the first angle value is measured at the center.
  • the second angle value is measured at the first side part and the second side part of the rib.
  • constant is meant that the first angle value and the second angle value do not vary in the part considered, or vary in a proportion less than 5 °.
  • the first angle value is variable from the first lateral part to the second lateral part and the second angle value is variable from the first upright towards the central part, and from the second upright towards the central part.
  • variable is meant the fact that, for different measurement points carried out on the central part, the first lateral part or the second lateral part, the first angle value or the second angle value vary by more than 5 ° depending on the measuring point of the same rib.
  • the first angle value and the second angle value are similar to each other.
  • first angle value and the second angle value are identical to each other to within a few degrees, that is to say a variation of less than 5 ° allowed.
  • first angle value and the second angle value are similar if they have a difference of less than 5 °.
  • first angle value and the second angle value are separate.
  • first angle value and the second angle value have a difference of more than 5 °.
  • the second angle value is sharper than the first angle value.
  • the first angle value is sharper than the second angle value.
  • the most acute angle is located at the part of the rib which is brought to meet first the heating element during insertion. This conformation provides the heating element with a ramp which allows it to slide more easily into place from its housing from its first contact with the leading edge.
  • the first angle value and the second angle value open gradually from the first upright towards the central part, and from the second upright towards the central part. Consequently, the angle values gradually increase from the outside of the housing towards the center of the latter in the lateral direction.
  • the central part is at least partly straight.
  • the central part generally extends along at least one main extension axis.
  • This main extension axis is transverse to the extension axis of the housing.
  • the main extension axis of the central part is transverse and perpendicular to the extension axis of the housing.
  • the central part is at least partly curved.
  • the shape of the central part is that of the internal face or the external face.
  • the shape of the central part contributes to the good stiffening of the rib and therefore of the frame. It also helps to facilitate the release of the frame.
  • the curve is characterized by a center.
  • the central part can advantageously include at least one curved region and one rectilinear region.
  • the central part is symmetrical with respect to a plane perpendicular to the longitudinal main elongation plane of the frame passing through the elongation axis of the housing.
  • the central part is only curved.
  • the central part forms a C.
  • the internal face of the rib comprises a device for holding the heating element in position, projecting from the rib.
  • the device for holding in position is an insert on the rib.
  • the device for holding in position is integrated into the rib so as to be molded at the same time as the rest of the frame and form an integral part of the one-piece structure of the frame.
  • the position holding device allows the central part, the first lateral part and the second lateral part of the rib to be placed away from the heating element.
  • the heating element once positioned in its housing, does not come into contact with the internal face of the rib except by the device for holding in position.
  • the device for holding it in position prevents the heating element from moving within this housing. Vibrations can result from starting the vehicle, or from the passage of the air flow: thanks to the holding device in position, the heating element is not affected.
  • the holding device thus ensures the stability of the heating element in its housing.
  • the holding device makes it possible to stabilize the heating element between the rib and at least one lug carried by one and or the other of the uprights of the frame. This lug is arranged on the face of the frame opposite the face carrying the rib in question.
  • the device for holding the heating element in position is carried by the central part of the rib.
  • the heating element is thus maintained in a median zone equidistant from the first upright and the second upright of the frame.
  • the device for holding the heating element in position has a bevelled profile inclined towards the housing of the heating element.
  • the heater holding device is located in the path of the heater during the assembly operation.
  • a bevelled profile facilitates the insertion of the heating element.
  • the inclination of the beveled profile of the holding device is similar to the part of the rib which carries it.
  • the beveled profile of this holding device adopts an angle of value similar to the first angle value of the central part.
  • the beveled profile of this holding device adopts an angle of value similar to the second angle value of the first side part and the second side part.
  • the device for holding the heating element in position is in contact with the heating element.
  • the holding device is supported on the heating element only where the holding device is the thickest.
  • the thickness of the holding device is measured perpendicular to the main longitudinal elongation plane of the frame.
  • the electric heating device comprises, on the same face of the frame and between the first upright and the second upright, the rib and an additional rib arranged in longitudinal series and joined in at least one junction portion .
  • the rib and the additional rib are arranged in a longitudinal series, that is to say one after the other in the direction of the longitudinal axis. For a joined rib and additional rib, the rib is closer to the first longitudinal end of the frame compared to the additional rib.
  • the rib interacts with the heating element during the mounting operation. It is important according to the invention that the rib has a beveled leading edge over which the heating element slides.
  • the additional rib, serving as a reinforcement, is not necessarily provided with it.
  • the junction portion is located in the central part of the rib.
  • the rib and the additional rib meet at the junction portion.
  • the central part of the rib merges with a central part of the additional rib.
  • the rib and the additional rib have distinct shapes.
  • the rib may be curved while the additional rib is straight.
  • the rib and the additional rib have symmetrical shapes with respect to a transverse axis passing through the junction zone.
  • the junction portion carries at least one device for holding the heating element in position.
  • a single holding device can be centered on the junction portion.
  • a plurality of holding devices is distributed over the junction portion.
  • the invention also relates to an electric heating device comprising a frame as previously described and at least one heating element housed in the housing of the frame.
  • the heating element is placed in a housing in the frame in which it is placed during the mounting operation.
  • the heating element occupies most of the housing: the heating element is dimensioned slightly smaller than the housing.
  • the heating element When installed in the housing, the heating element abuts the frame on the side of the second longitudinal end. Once inserted via the first longitudinal end of the frame, the heating element is held in the frame by closing off the first longitudinal end, in particular by fixing an electrical connection interface.
  • the invention also relates to a ventilation, heating and / or air conditioning installation box for a vehicle comprising such an electric heating device.
  • the air flow brought through the housing can thus be oriented to circulate through the electric heating device.
  • FIG. 1 is a general perspective view of an electric heating device according to the invention, making at least a visible frame according to one aspect of the invention inside which two heating elements are arranged,
  • FIG. 2 is a longitudinal sectional view of the electric heating device according to the invention presented in Figure 1, a housing through which the cut is made being here devoid of heating element to make visible the shapes of the associated ribs to this accommodation,
  • FIG. 3 is a front view of an electric heating device frame according to the invention, in a second embodiment, illustrated during an operation of mounting a heating element inside a housing provided in this context,
  • Figure 4 is a view of the frame and the heating element of Figure 3, in longitudinal section and side view.
  • the longitudinal, transverse or lateral names refer to the orientation of the heating element or of the frame of the electric heating device according to the invention.
  • the longitudinal direction corresponds to the longitudinal axis in which the housing of the frame extends, and along which the heating elements are inserted in this frame, while the transverse and lateral orientations correspond to concurrent lines, that is to say say which cross the longitudinal direction, in particular perpendicular to the longitudinal axis of the housing.
  • the exterior or interior designations can be assessed in relation to the structure of the frame, the interior designation corresponding to the housing formed between the walls defining this structure.
  • an electric heating device 1 comprising a frame 3 defining two housings 4 in which are housed heating elements 2.
  • the frame 3 extends along a plane A of elongation main longitudinal. It is configured to heat an air flow FA circulating transversely to the plane A of the main longitudinal extension.
  • the heating elements 2 include metal fins 35 in contact with resistive elements which in particular take the form of ceramic stones 6 with PTC effect and which generate heat under the effect of an electrical supply to the heating elements, the heat being by elsewhere diffused by the metal fins 35.
  • Each housing 4 extends along a longitudinal axis X.
  • the heating elements 2 are dimensioned so as to be able to be arranged in the housing 4 formed in the frame 3.
  • the frame 3 has two openwork faces 5 so as to allow the flow of the air flow FA through the electric heating device 1. Each open face 5 thus opens onto the housings 4 so that the air flow FA passes through the elements heaters 2.
  • the frame 3 has a first longitudinal end 7 provided with an opening to allow the insertion of the heating elements 2 into the housing 4 and a second longitudinal end 8 opposite the first longitudinal end 7.
  • the heating elements 2 are already installed in their respective housings 4.
  • the opening of the first longitudinal end 7 is here closed by a cover 9 integrating an electrical connection 31, the cover 9 being fitted on the first longitudinal end 7 of the frame.
  • the second longitudinal end 8 longitudinally closes the housings 4 by forming a bottom wall capable of holding the heating elements 2.
  • Each housing 4 is bordered laterally by a first upright 10 of the frame 3 and by a second upright 11 of the frame 3, the first upright 10 and the second upright 11 being substantially parallel to the longitudinal axis X.
  • the frame 3 comprises at least one rib 12, 13 in particular making it possible to stiffen the perforated frame. More particularly, the frame 3 may include a rib 12 and an additional rib 13, joined and organized in pairs, each rib making it possible to stiffen the perforated frame.
  • the additional rib 13 is arranged in series longitudinally with the rib 12, so that the rib and the additional rib are arranged one after the other along the longitudinal axis X.
  • the frame 3 comprises several ribs 12 and additional ribs 13, organized in pairs.
  • Each of the ribs here has a unique C-shaped curvature.
  • the rib 12 and the additional rib 13 participate, with the first upright 10 and the second upright 11, in delimiting the housing 4, the rib 12 and the additional rib 13 participating in delimiting the housing in the transverse direction corresponding to the direction of flow of the air flow FA.
  • the first upright 10 and the second upright 11 also carry lugs 14 on which the heating elements 2 can bear.
  • the pins 14 project from the first upright 10 and the second upright 11 to form a stop for the heating elements across the perforated face 5.
  • the frame 3 also has two lateral ends 15.
  • a central part 16 separates the housings 4 and contributes to the structure of the frame 3.
  • the first upright 10, the second upright 11, the first ribs 12, the second ribs 13, the two lateral ends 15 of the frame and the central part 16 of the frame 3 are inseparable, so as to constitute a one-piece structure obtained for example by molding.
  • the cover 9 is also an added piece on the frame 3.
  • FIG. 2 shows the electric heating device 1 according to the invention, in the first embodiment presented in FIG. 1, under the angle of section B-B.
  • the view here represented is similar to what has been described for FIG. 1.
  • the heating elements 2 normally present in the housing 4 through which the section BB has been removed.
  • the rib 12 comprises a central part 18, a first lateral part 19 connected on the one hand to the first upright 10 of the frame 3 and on the other hand to the central part 18, as well as a second lateral part 20, visible in the figures. 1 and 3, and connected to the second upright 11 of the frame 3 and to this central part 18.
  • the rib 12 here has a single C-shaped curvature. It is further characterized by its longitudinal dimension "h” defining the first lateral part 19 and the second lateral part 20 which is larger than the longitudinal dimension "H” defining the central part 18.
  • the rib 12 also comprises an external face 21 and an opposite internal face oriented towards the inside of the frame, that is to say towards the housing and the heating element which is housed therein.
  • the internal face and the external face are connected at their longitudinal ends by a leading edge 22 and a border 23 opposite the leading edge 22.
  • the leading edge 22 of the rib 12 that is to say the edge of the rib closest to the first longitudinal end by which are inserted the heating elements in the frame, comprises a bevel 25 forming an inclined ramp towards the housing 4 of the heating element 2.
  • the bevel 25 is configured to form at least one slope which extends from the leading edge 22 towards the internal face of the rib.
  • the leading edge 22 is configured so that the bevel 25 has a double slope, namely a first slope 32, main slope of the leading edge 22, and a second slope 33.
  • the first slope 32 and the second slope 32 meet at a junction line 34 of the slopes 32, 33.
  • the junction line 34 is more distant from the housing 4 than from the outside of the frame 3.
  • the bevel 25 and in particular the angle thereof, that is to say the inclination of the slope guiding the heating elements towards the interior of the frame during insertion, is here different between the central part 18 and the side parts 19, 20.
  • the bevel is thus configured so as to have a first angle value "a1" at the level of the central part 18 and a second angle value "a2" at the level of the side parts 19, 20, different from the first angle value "al” for the same rib 12.
  • the heating element 2 inserted into the housing 4 of the frame 3 is caused to concomitantly meet the first side part 19 and the second side part 20, before the central part 18 , the first lateral part 19 and the second lateral part 20 being closer to the first longitudinal end 7.
  • the angle formed by the bevel 25 is increasing.
  • the second angle value "a2" in the first lateral part 19 and in the second lateral part 20 is sharper than the first angle value "al” in the central part 18.
  • the second angle value "a2" and the first angle value “al” are also variable and increasing so as to accompany the progression of the heating element 2 sliding against the leading edge 22. By increasing is meant that the second angle value "a2 "And the first angle value” al "open gradually from the first upright 10 towards the central part 18, and from the second upright 11 towards the central part 18.
  • the additional rib 13 comprises a central part 28, a first lateral part 29 connected to the first upright 10 of the frame 3 and a second lateral part 30 is connected to the second upright 11 of the frame 3.
  • the additional rib 13 participates in the stiffening of the frame 3 without affecting the insertion of the heating element 2, unlike the rib 12.
  • the central part 18 of the rib 12 describes a curve and the central part 28 of the additional rib 13 also describes a curve. These two curves are arranged in opposite directions, so that a portion of the central portion 18 merges with a portion of the central portion 28.
  • the meeting point of the rib 12 and the additional rib 13 corresponds to a junction portion 26. More particularly, the rib 12 and the additional rib 13 are C-shaped, symmetrical to each other with respect to the junction portion 26.
  • the rib 12 and the additional rib 13 comprise at least one device 27 for holding the heating element 2 in position, projecting from the junction portion 26 of the rib 12 and the additional rib 13, on the side of the element. heater 2.
  • two devices for holding in position are disposed in this junction portion 26. This or these devices 27 for holding in position of the heating element 2 are intended to be in contact with the heating element 2.
  • the device (s) 27 for holding the heating element 2 in position have, at least on their face opposite the first longitudinal end of the frame, a beveled profile forming an inclined plane there also towards the housing 4 of the heating element 2 This profile is inclined at an angle of value corresponding to the first angle value "al" of the bevel 25 taken at the level of the central part 18 of the leading edge 22 of the rib 12.
  • the rib 12 and the additional rib 13 are carried by one or the other of the perforated faces 5 of the frame 3.
  • a pair of ribs 12, 13 of a face 5 can in particular be positioned alternately with respect to another pair of ribs 12, 13 carried than the other face 5.
  • the opposite face can carry a pair of lugs 14 projecting respectively from the first upright 10 and the second upright 11. It is understood that these lugs 14 participate in forming an obstacle to transverse release of the heating element, the heating element 2 being intended to bear on the device 27 for holding in position the heating element 2 carried by the pair of ribs 12, 13 on one side and / or on these pins 14 carried on the other side.
  • Figures 3 and 4 show the electric heating device 1 illustrated during an assembly operation, during the insertion of the heating elements 2 and associated PTC effect stones 6 in the housing 4. To facilitate reading of this FIG. 3, only part of the frame 3, between the first upright 10 and the second upright 11, has been shown.
  • Figures 3 and 4 show a second embodiment of the frame 3, which differs from what has previously been described in that the ribs arranged in longitudinal series are ribs 12 alone. All the ribs 12 are identical and distributed homogeneously on the perforated face 5 of the frame 3. However, the illustrated mounting operation is valid for all the embodiments of the invention, that the frame 3 is provided with only the ribs 12 or ribs 12 joined to the additional ribs 13 as previously described, and whatever the arrangement or the shape of the ribs 12 coming within the scope of the invention.
  • each rib 12 is divided into a central part 18, a first lateral part 19 and a second lateral part 20, and each rib 12 has a face external 21, facing outwards from the frame and opposite the heating elements, a leading edge 22 and an edge 23 opposite the leading edge 22.
  • the rib 12 also has a face internal 24, facing the housing of the heating elements.
  • the rib 12 is generally rectilinear, whether at its central part 18, its first lateral part 19 or its second lateral part 20.
  • the rib 12 forms a strip perpendicular to the axis longitudinal X and having a homogeneous longitudinal dimension H of constant value, the longitudinal dimension being measured along the longitudinal axis X of the housing 4 between the leading edge 22 and the edge 23 of the rib 12 on the outer face side 21.
  • This conformation n is however not limiting: the central part 18, the first lateral part 19 and / or the second lateral part 20 could take different forms from that described here, and could be different from each other. Likewise, they could take different directions.
  • one or more devices for holding in position can be carried by the internal face of the rib 12, for example at its central part 18.
  • the heating element 2 is inserted by the first longitudinal end 7, shown open, in the absence of a cover 9.
  • the direction taken by the heating element 2 during its insertion is indicated by an arrow 17.
  • FIG. 4 illustrates the electric heating device 1 according to the invention presented in FIG. 3 according to a section A- A.
  • the section AA is perpendicular to the plane A of longitudinal main elongation of the electric heating device 1 and passes through the axis longitudinal X of the housing 4.
  • the section AA in particular passes through the central part 18 of each rib 12.
  • the leading edge 22 of the rib 12 has a bevel 25 forming an inclined ramp towards the housing 4 of the heating element 2.
  • the bevel 25 here has only a single slope 32 formed between the external face 21 and the edge d 'attack 22. This slope 32 is characterized here by an angle value "a12" constant over the entire lateral dimension of the same rib 12, and over all of the ribs 12 of the housing 4 considered.
  • the border 23 is perpendicular to the longitudinal axis X.
  • the bevel 25 is inclined so that the leading edge 22 is closer longitudinally to the first longitudinal end 7 on the outer face side 21 than on the inner face side 24.
  • Section AA illustrates a heating element 2, and the associated PTC effect stones 6, which may deviate from its trajectory, during the insertion operation, as shown by arrow 17.
  • the heating element 2 is offset by relative to the longitudinal axis X as visible in FIG. 4.
  • the heating element 2 meets one of the ribs 12 and more particularly its leading edge facing the first longitudinal end. Thanks to the bevel 25 of the leading edge 22 and the orientation of the inclined plane which it participates in forming, the heating element 2 slides towards the interior of the housing, directed according to the inclination of the bevel 25 so as to center on the longitudinal axis X of the housing 4.
  • the heating element is brought into contact if necessary with the first slope 32, that is to say the slope facing the interior of the housing, so that here too, the bevelled shape of the leading edge allows the heating element to be guided towards the inside of the frame and its housing.
  • the present invention provides an electric heating device frame configured to facilitate its mounting.
  • This electric heating device frame intended in particular to be integrated in a ventilation, heating, and / or air conditioning installation of motor vehicles, makes it possible to smoothly insert a heating element within the frame in order to form the device. electric heating.
  • the mounting operation is easier whatever the embodiment of the invention, thanks to the bevelled rib.
  • the invention cannot however be limited to the means and configurations described and illustrated here, and it also extends to any equivalent means or configuration and to any technical combination operating such means.
  • the shape of the electric heating device frame can be modified without harming the invention, insofar as the electric heating device frame for a vehicle, ultimately, fulfills the same functions as those described in this document.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention concerns a frame (3) for an electrical heating device (1) configured to heat an airflow (FA) circulating in the casing of a vehicle ventilation, heating and/or air conditioning system, the frame (3) having two faces (5), a first longitudinal end (7) and a second longitudinal end (8), at least one rib (12) with an inner face (24) and an outer face (21), the inner face (24) being connected to the outer face (21) by a leading edge (22) oriented towards the first longitudinal end (7) and an edge (23), characterised in that the leading edge (22) of the rib (12) has a ramp-like bevel (25) inclined towards the housing (4). Said invention is applicable to motor vehicles.

Description

DISPOSITIF DE CHAUFFAGE ELECTRIQUE POUR FLUX D’AIR A NERVURE ELECTRIC HEATING DEVICE FOR RIB AIR
BISEAUTEE POUR VEHICULE BEVELLED FOR VEHICLE
Le domaine de la présente invention est celui des échangeurs thermiques tels que les dispositifs de chauffage électrique pour véhicule. L'invention s'applique plus particulièrement aux installations de ventilation, de chauffage, et/ou de climatisation de véhicules automobiles comportant de tels dispositifs permettant de réchauffer un flux d’air. The field of the present invention is that of heat exchangers such as electric heating devices for vehicles. The invention applies more particularly to ventilation, heating, and / or air conditioning installations of motor vehicles comprising such devices making it possible to heat an air flow.
Il est connu de réchauffer de l'air provenant de l’extérieur du véhicule et destiné au chauffage de l'habitacle d'un véhicule automobile, ou encore permettant un désembuage ou dégivrage. Ce réchauffement est assuré par le passage d’un flux d'air extérieur à travers un dispositif de chauffage électrique. Cet échange thermique peut avoir lieu dans une installation de ventilation, de chauffage, et/ou de climatisation autrement appelée installation HVAC, pour l’acronyme anglais « Heating, Ventilating and Air-Conditioning » où le dispositif de chauffage électrique est logé, ou en marge de l’installation HVAC avec un dispositif de chauffage électrique placé en complément de cette installation. Grâce au dispositif de chauffage électrique, le flux d’air est porté à une température suffisante pour réchauffer l’habitacle. It is known to heat air coming from outside the vehicle and intended for heating the passenger compartment of a motor vehicle, or even allowing demisting or defrosting. This heating is ensured by the passage of an external air flow through an electric heating device. This heat exchange can take place in a ventilation, heating, and / or air conditioning installation otherwise called HVAC installation, for the acronym "Heating, Ventilating and Air-Conditioning" where the electric heating device is housed, or in margin of the HVAC installation with an electric heating device placed in addition to this installation. Thanks to the electric heater, the air flow is brought to a temperature sufficient to heat the passenger compartment.
Le dispositif de chauffage électrique comporte un cadre, dans lequel sont logés des éléments chauffants alimentés électriquement via une connectique appropriée en périphérie dudit cadre. Le cadre sert de support aux éléments chauffants et à la connectique électrique associée, et il permet également au dispositif de chauffage électrique d’être fixé au véhicule, par exemple au sein de l’installation HVAC du véhicule. Les éléments chauffants sont constitués d’ailettes métalliques captant et conduisant thermiquement la chaleur générée par des éléments résistifs formés par des pierres céramiques à effet PTC, acronyme anglais de l’expression « Positive Température Coefficient ». Les éléments à effet PTC génèrent de la chaleur sous l’effet d’une alimentation électrique appropriée et les ailettes métalliques formant des éléments radiants restituent cette chaleur au flux d’air circulant à leur contact, de sorte qu’en sortie du dispositif de chauffage électrique en fonctionnement, le flux d’air est plus chaud qu’à son entrée. A titre d’exemple non limitatif, les pierres céramiques à effet PTC ont une chaleur de surface pouvant atteindre l50°C à l70°C, les ailettes métalliques formant éléments radiants associés pouvant être portés à une température de 5 à l0°C moindre que celle des pierres à effet PTC. The electric heating device comprises a frame, in which are housed heating elements supplied electrically via a suitable connector at the periphery of said frame. The frame serves as a support for the heating elements and the associated electrical connections, and it also allows the electric heating device to be fixed to the vehicle, for example within the vehicle's HVAC installation. The heating elements consist of metal fins that thermally collect and conduct the heat generated by resistive elements formed by ceramic stones with PTC effect, an acronym for the expression "Positive Temperature Coefficient". The elements with PTC effect generate heat under the effect of an appropriate electrical supply and the metal fins forming radiant elements restore this heat to the air flow circulating in contact with them, so that at the outlet of the heating device electric in operation, the air flow is hotter than it came in. By way of nonlimiting example, ceramic stones with PTC effect have a surface heat of up to 150 ° C to 170 ° C, the metal fins forming associated radiant elements being able to be brought to a temperature of 5 to 10 ° C less than that of PTC effect stones.
Dans un souci d’optimisation de l’espace occupé par un tel dispositif électrique de chauffage, le cadre et les éléments chauffants qu’il contient sont dimensionnés de sorte à réduire leur encombrement. Ainsi, les éléments chauffants sont disposés dans un logement ménagé dans le cadre et y occupent tout l’espace. Cette optimisation de l’encombrement est préjudiciable au montage : en effet les ailettes métalliques constitutives des éléments chauffants sont déformables et lorsqu’elles sont glissées dans leur logement, ces ailettes métalliques sont susceptibles de se déformer si elles heurtent leur cadre. Bien entendu, la déformation ou la casse des ailettes métalliques est préjudiciable aux performances d’échanges thermiques du radiateur électrique. In order to optimize the space occupied by such an electric heating device, the frame and the heating elements which it contains are dimensioned so as to reduce their size. Thus, the heating elements are arranged in a housing formed in the frame and occupy all the space there. This optimization of space is detrimental to assembly: in fact the metal fins constituting the heating elements are deformable and when they are slid into their housing, these metal fins are liable to deform if they strike their frame. Of course, the deformation or breakage of the metal fins is detrimental to the heat exchange performance of the electric radiator.
Le but de la présente invention est donc de résoudre les inconvénients décrits ci-dessus en concevant un dispositif électrique de chauffage dont le montage est facilité et compatible avec une optimisation du dimensionnement des éléments chauffants par rapport à leur logement afin d’améliorer l’encombrement du boîtier d’installation HVAC dans lequel il est intégré. The object of the present invention is therefore to solve the drawbacks described above by designing an electric heating device, the mounting of which is facilitated and compatible with an optimization of the dimensioning of the heating elements relative to their housing in order to improve the space requirement. the HVAC installation box in which it is integrated.
L'invention a donc pour objet un cadre de dispositif de chauffage électrique configuré pour chauffer un flux d’air circulant dans un boîtier d’installation de ventilation, de chauffage et/ou de climatisation de véhicule, le cadre s’étendant selon un plan d’allongement principal longitudinal et comprenant au moins un logement s’étendant selon un axe longitudinal et étant destiné à loger au moins un élément chauffant, le cadre comportant deux faces ajourées, une première extrémité longitudinale permettant l’insertion de l’élément chauffant dans le logement et une deuxième extrémité longitudinale opposée à la première extrémité longitudinale, au moins une nervure avec une face interne orientée vers le logement du cadre et une face externe opposée à la face interne, la face interne de la nervure étant reliée à la face externe de la nervure par un bord d’attaque orienté vers la première extrémité longitudinale du cadre et une bordure opposée au bord d’attaque, caractérisé en ce que le bord d’attaque de la nervure comporte un biseau formant rampe inclinée vers le logement de l’élément chauffant. Le cadre dispose de faces ajourées laissant apparaître l’élément chauffant qu’il loge et autorisant le passage du flux d’air à chauffer au travers du cadre. Le flux d’air emprunte ainsi une trajectoire transversale traversant le dispositif de chauffage électrique, la trajectoire transversale étant globalement perpendiculaire ou sensiblement perpendiculaire au plan d’allongement principal longitudinal du cadre. Le flux d’air entre ainsi par l’une des faces du cadre, traverse l’élément chauffant et récupère des calories au contact des éléments radiants, si l’élément chauffant est alimenté électriquement, puis sort par l’autre face du cadre. The subject of the invention is therefore an electric heating device frame configured to heat a flow of air circulating in a vehicle ventilation, heating and / or air conditioning installation box, the frame extending along a plane. main longitudinal elongation and comprising at least one housing extending along a longitudinal axis and being intended to accommodate at least one heating element, the frame comprising two perforated faces, a first longitudinal end allowing the insertion of the heating element in the housing and a second longitudinal end opposite the first longitudinal end, at least one rib with an internal face oriented towards the housing of the frame and an external face opposite to the internal face, the internal face of the rib being connected to the external face of the rib by a leading edge oriented towards the first longitudinal end of the frame and a border opposite the leading edge aque, characterized in that the leading edge of the rib has a bevel forming an inclined ramp towards the housing of the heating element. The frame has openwork faces revealing the heating element that it houses and allowing the passage of the air flow to be heated through the frame. The air flow thus follows a transverse trajectory passing through the electric heating device, the transverse trajectory being generally perpendicular or substantially perpendicular to the main longitudinal elongation plane of the frame. The air flow thus enters through one of the faces of the frame, passes through the heating element and recovers calories in contact with the radiant elements, if the heating element is electrically supplied, then exits through the other face of the frame.
Une opération de montage est préalable à l’installation du dispositif de chauffage électrique dans le véhicule. L’élément chauffant est inséré dans le logement selon le plan d’allongement principal du cadre dans la direction de l’axe d’allongement du logement qui le reçoit. L’une des extrémités du cadre, ici la première extrémité longitudinale, est destinée à l’insertion de l’élément chauffant. La première extrémité longitudinale du cadre est ainsi ouverte, alors que la deuxième extrémité longitudinale du cadre peut être fermée. An assembly operation is prior to the installation of the electric heater in the vehicle. The heating element is inserted into the housing according to the main extension plan of the frame in the direction of the extension axis of the housing which receives it. One of the ends of the frame, here the first longitudinal end, is intended for the insertion of the heating element. The first longitudinal end of the frame is thus open, while the second longitudinal end of the frame can be closed.
La nervure présente sur le cadre permet de rigidifier ce dernier, qui peut être fragilisé par la présence des faces ajourées laissant passer le flux d’air. Selon un aspect de l’invention, une pluralité de nervures est répartie sur les deux faces ajourées du cadre. Leur répartition est plus avantageusement homogène pour rigidifier le cadre sur l’ensemble de sa structure. The rib present on the frame makes it possible to stiffen the latter, which can be weakened by the presence of the perforated faces allowing the air flow to pass. According to one aspect of the invention, a plurality of ribs is distributed over the two openwork faces of the frame. Their distribution is more advantageously homogeneous to stiffen the frame over its entire structure.
La nervure est munie d’un bord d’attaque biseauté, incliné de sorte à former une rampe. La rampe est inclinée pour que le bord d’attaque soit plus proche de la première extrémité longitudinale du côté de la face externe par rapport à la face interne. Le bord d’attaque est le bord de la nervure reliant le premier montant du cadre et le deuxième montant du cadre tout en faisant face à l’élément chauffant en cours d’insertion lors de l’opération de montage. Le biseau peut former sur le bord d’attaque une première pente et une deuxième pente. Au moins l’une des pentes correspond à la rampe précédemment décrite, en étant inclinée vers le logement du cadre. De la sorte, le biseau procure au bord d’attaque de la nervure une forme de flèche avec la pointe formée par l’arête de jonction des deux pentes. La première pente peut être inclinée vers le logement du cadre et la deuxième pente peut être inclinée vers la face externe de la nervure. Selon une caractéristique de l’invention propre à ce mode de réalisation, la première pente peut occuper la majeure partie du bord d’attaque de sorte à ce qu’une ligne de jonction des pentes soit plus proche de la face externe de la nervure que de la face interne de la nervure. La première pente est ainsi la pente principale du bord d’attaque. The rib is provided with a beveled leading edge, inclined so as to form a ramp. The ramp is inclined so that the leading edge is closer to the first longitudinal end on the side of the external face relative to the internal face. The leading edge is the edge of the rib connecting the first upright of the frame and the second upright of the frame while facing the heating element being inserted during the mounting operation. The bevel can form a first slope and a second slope on the leading edge. At least one of the slopes corresponds to the previously described ramp, being inclined towards the housing of the frame. In this way, the bevel provides the leading edge of the rib with an arrow shape with the point formed by the junction edge of the two slopes. The first slope can be inclined towards the housing of the frame and the second slope can be inclined towards the external face of the rib. According to a characteristic of the invention specific to this embodiment, the first slope can occupy most of the leading edge so that a junction line of the slopes is closer to the outer face of the rib than of the inner side of the rib. The first slope is thus the main slope of the leading edge.
Le biseau aide au montage de l’élément chauffant. En effet, l’élément chauffant, lorsqu’il est inséré dans son logement, peut être amené à rencontrer le bord d’attaque de la nervure. Lorsque le bord d’attaque et l’élément chauffant se rencontrent, l’élément chauffant glisse sur le bord d’attaque de par sa conformation biseautée. Grâce au biseau et à sa rampe inclinée vers le logement, l’élément chauffant poursuit sa progression au sein du logement selon l’axe longitudinal du logement sans s’accrocher à la nervure, s’y immobiliser ou y être détérioré. Un tel bord d’attaque favorise ainsi le bon positionnement de l’élément chauffant en améliorant l’insertion de l’élément chauffant dans le logement et en minimisant les risques de collision et de détérioration de l’élément chauffant lors de son insertion. The bevel helps in mounting the heating element. Indeed, the heating element, when it is inserted in its housing, can be brought to meet the leading edge of the rib. When the leading edge and the heating element meet, the heating element slides on the leading edge due to its beveled conformation. Thanks to the bevel and its inclined ramp towards the housing, the heating element continues to progress within the housing along the longitudinal axis of the housing without clinging to the rib, immobilizing it or being damaged therein. Such a leading edge thus promotes the correct positioning of the heating element by improving the insertion of the heating element into the housing and minimizing the risk of collision and deterioration of the heating element during its insertion.
Selon un aspect de l’invention, le cadre est un ensemble monobloc. Ainsi, la nervure ne peut être dissociée des autres éléments du cadre qu’en détériorant sa structure. According to one aspect of the invention, the frame is a one-piece assembly. Thus, the rib can only be dissociated from the other elements of the frame by deteriorating its structure.
Selon un aspect de l’invention, le cadre est obtenu par moulage d’au moins un matériau synthétique. Avantageusement, le matériau est un matériau plastique composite, tel du polytéréphthalate de butylène avec fibre de verre (PBT-GF) ou du polyamide renforcé par fibres de verre (par exemple le PA 66-GF30). According to one aspect of the invention, the frame is obtained by molding at least one synthetic material. Advantageously, the material is a composite plastic material, such as polybutylene terephthalate with fiberglass (PBT-GF) or glass fiber reinforced polyamide (for example PA 66-GF30).
Selon un aspect de l’invention, le logement est bordé latéralement par un premier montant du cadre et par un deuxième montant du cadre, le premier montant et le deuxième montant étant sensiblement parallèles à l’axe longitudinal, la nervure comportant une partie centrale, une première partie latérale reliée à la partie centrale et au premier montant du cadre et une deuxième partie latérale reliée à la partie centrale et au deuxième montant du cadre, le biseau formant une pente inclinée d’une première valeur d’angle dans la partie centrale et d’une deuxième valeur d’angle dans la première partie latérale et la deuxième partie latérale. Par latéralement, on entend une direction perpendiculaire aux directions longitudinale et transversale précédemment définies. According to one aspect of the invention, the housing is bordered laterally by a first upright of the frame and by a second upright of the frame, the first upright and the second upright being substantially parallel to the longitudinal axis, the rib comprising a central part, a first lateral part connected to the central part and to the first upright of the frame and a second lateral part connected to the central part and to the second upright of the frame, the bevel forming an inclined slope of a first angle value in the central part and a second angle value in the first side part and the second side part. By laterally is meant a direction perpendicular to the previously defined longitudinal and transverse directions.
Fe premier montant du cadre et le deuxième montant du cadre, tout comme la nervure et sa partie centrale, sa première partie latérale et sa deuxième partie latérale, font partie de la structure monobloc du cadre. Fe first upright of the frame and the second upright of the frame, just like the rib and its central part, its first lateral part and its second lateral part, are part of the one-piece structure of the frame.
Fa partie centrale de la nervure est dédiée à rigidifier le cadre. Elle s’étend entre la première partie latérale et la deuxième partie latérale, au travers de la face ajourée du cadre sur la trajectoire du flux d’air. La partie centrale est biseautée au niveau du bord d’attaque selon la première valeur d’angle. The central part of the rib is dedicated to stiffening the frame. It extends between the first lateral part and the second lateral part, through the openwork face of the frame on the air flow path. The central part is bevelled at the leading edge according to the first angle value.
La première partie latérale et la deuxième partie latérale de la nervure servent à raccorder la partie centrale de la nervure respectivement au premier montant et au deuxième montant du cadre. Selon une caractéristique de l’invention, au moins une partie latérale est biseautée selon une deuxième valeur d’angle différente de la première valeur d’angle correspondant à la partie centrale. The first lateral part and the second lateral part of the rib serve to connect the central part of the rib respectively to the first upright and to the second upright of the frame. According to a characteristic of the invention, at least one lateral part is bevelled according to a second angle value different from the first angle value corresponding to the central part.
Selon une caractéristique de l’invention, la première partie latérale et la deuxième partie latérale ont une dimension longitudinale plus grande qu’une dimension longitudinale de la partie centrale. La dimension longitudinale est mesurée selon l’axe longitudinal du logement entre le bord d’attaque et la bordure de la nervure. Cette dimension longitudinale plus grande pour les parties latérales assure une liaison solide de la nervure sur le cadre. According to a characteristic of the invention, the first lateral part and the second lateral part have a greater longitudinal dimension than a longitudinal dimension of the central part. The longitudinal dimension is measured along the longitudinal axis of the housing between the leading edge and the edge of the rib. This greater longitudinal dimension for the lateral parts ensures a solid connection of the rib on the frame.
Selon une caractéristique de l’invention, la première partie latérale et la deuxième partie latérale sont moins larges que la partie centrale. La largeur est mesurée perpendiculairement à l’axe longitudinal du logement, entre le premier montant et la partie centrale pour la première partie latérale, entre le deuxième montant et la partie centrale pour la deuxième partie latérale et entre la première partie latérale et la deuxième partie latérale pour la partie centrale. Ainsi, la partie centrale est la partie de la nervure principalement exposée au flux d’air. According to a characteristic of the invention, the first side part and the second side part are narrower than the central part. The width is measured perpendicular to the longitudinal axis of the housing, between the first upright and the central part for the first lateral part, between the second upright and the central part for the second lateral part and between the first lateral part and the second part lateral for the central part. Thus, the central part is the part of the rib mainly exposed to the air flow.
Il convient de noter qu’agrandir la dimension longitudinale de la nervure localement au niveau de la première partie latérale et de la deuxième partie latérale, sur une faible largeur, permet de renforcer la liaison de la nervure avec le cadre en entravant à minima le flux d’air. It should be noted that enlarging the longitudinal dimension of the rib locally at the level of the first lateral part and of the second lateral part, over a small width, makes it possible to strengthen the connection of the rib with the frame by minimizing the flow air.
Selon un aspect de l’invention, la première valeur d’angle est définie par le bord d’attaque et la face extérieure. Alternativement, la première valeur d’angle est définie par la première pente du bord d’attaque et la deuxième pente du bord d’attaque. According to one aspect of the invention, the first angle value is defined by the leading edge and the outer face. Alternatively, the first angle value is defined by the first slope of the leading edge and the second slope of the leading edge.
Selon un aspect de l’invention, la deuxième valeur d’angle est définie par le bord d’attaque et la face extérieure. Alternativement, la deuxième valeur d’angle est définie par la première pente du bord d’attaque et la deuxième pente du bord d’attaque. Avantageusement pour la première valeur d’angle comme pour la deuxième valeur d’angle, la première pente occupe la majeure partie du bord d’attaque de sorte à ce qu’une ligne de jonction des pentes soit plus proche de la face externe de la nervure que de la face interne de la nervure. According to one aspect of the invention, the second angle value is defined by the leading edge and the outer face. Alternatively, the second angle value is defined by the first slope of the leading edge and the second slope of the leading edge. Advantageously for the first angle value as for the second angle value, the first slope occupies most of the leading edge so that a junction line of the slopes is closer to the outer face of the rib only from the inner side of the rib.
Selon un aspect de l’invention, la première valeur d’angle est inférieure à 180°. Avantageusement, la première valeur d’angle est inférieure ou égale à 90°. Très avantageusement, la première valeur d’angle est inférieure ou égale à 45°. According to one aspect of the invention, the first angle value is less than 180 °. Advantageously, the first angle value is less than or equal to 90 °. Very advantageously, the first angle value is less than or equal to 45 °.
Selon un aspect de l’invention, la deuxième valeur d’angle est inférieure à 180°. Avantageusement, la deuxième valeur d’angle est inférieure ou égale à 90°. Très avantageusement, la deuxième valeur d’angle est inférieure ou égale à 45°. According to one aspect of the invention, the second angle value is less than 180 °. Advantageously, the second angle value is less than or equal to 90 °. Very advantageously, the second angle value is less than or equal to 45 °.
Selon un aspect de l’invention, la première valeur d’angle est constante depuis la première partie latérale vers la deuxième partie latérale, c’est-à-dire constante d’une extrémité latérale à l’autre de la partie centrale. Et la deuxième valeur d’angle est constante depuis le premier montant vers la partie centrale, c’est-à-dire constante d’une extrémité latérale à l’autre de la première partie latérale, et depuis le deuxième montant vers la partie centrale, c’est-à-dire constante d’une extrémité latérale à l’autre de la première partie latérale. La première valeur d’angle est mesurée au niveau de la partie centrale. La deuxième valeur d’angle est mesurée au niveau de la première partie latérale et de la deuxième partie latérale de la nervure. Par « constante » on entend que la première valeur d’angle et la deuxième valeur d’angle ne varient pas dans la partie considérée, ou varient dans une proportion inférieure à 5°. According to one aspect of the invention, the first angle value is constant from the first lateral part to the second lateral part, that is to say constant from one lateral end to the other of the central part. And the second angle value is constant from the first upright towards the central part, i.e. constant from one lateral end to the other of the first lateral part, and from the second upright towards the central part , that is to say constant from one lateral end to the other of the first lateral part. The first angle value is measured at the center. The second angle value is measured at the first side part and the second side part of the rib. By "constant" is meant that the first angle value and the second angle value do not vary in the part considered, or vary in a proportion less than 5 °.
Selon un aspect alternatif de l’invention, la première valeur d’angle est variable depuis la première partie latérale vers la deuxième partie latérale et la deuxième valeur d’angle est variable depuis le premier montant vers la partie centrale, et depuis le deuxième montant vers la partie centrale. On entend par variable le fait que, pour différents points de mesures effectués sur la partie centrale, la première partie latérale ou la deuxième partie latérale, la première valeur d’angle ou la deuxième valeur d’angle varient de plus de 5° selon le point de mesure d’une même nervure. En d’autres termes, depuis la première partie latérale vers la deuxième partie latérale la première valeur d’angle peut évoluer, depuis le premier montant vers la partie centrale la deuxième valeur d’angle peut évoluer, et depuis le deuxième montant vers la partie centrale la deuxième valeur d’angle peut évoluer. Selon un aspect de l’invention, la première valeur d’angle et la deuxième valeur d’angle sont similaires l’une par rapport à l’autre. On entend par similaire le fait que la première valeur d’angle et la deuxième valeur d’angle sont identiques l’une à l’autre à quelques degrés près, c’est à dire une variation de moins de 5° autorisée. Ainsi, la première valeur d’angle et la deuxième valeur d’angle sont similaires si elles présentent une différence de moins de 5°. Alternativement, la première valeur d’angle et la deuxième valeur d’angle sont distinctes. Par distinctes on entend que la première valeur d’angle et la deuxième valeur d’angle présentent une différence de plus de 5°. According to an alternative aspect of the invention, the first angle value is variable from the first lateral part to the second lateral part and the second angle value is variable from the first upright towards the central part, and from the second upright towards the central part. By variable is meant the fact that, for different measurement points carried out on the central part, the first lateral part or the second lateral part, the first angle value or the second angle value vary by more than 5 ° depending on the measuring point of the same rib. In other words, from the first lateral part to the second lateral part the first angle value can evolve, from the first upright towards the central part the second angle value can evolve, and from the second upright towards the part central the second angle value can change. According to one aspect of the invention, the first angle value and the second angle value are similar to each other. By similar is meant the fact that the first angle value and the second angle value are identical to each other to within a few degrees, that is to say a variation of less than 5 ° allowed. Thus, the first angle value and the second angle value are similar if they have a difference of less than 5 °. Alternatively, the first angle value and the second angle value are separate. By distinct is meant that the first angle value and the second angle value have a difference of more than 5 °.
Selon un aspect de l’invention, la deuxième valeur d’angle est plus aigüe que la première valeur d’angle. Alternativement, la première valeur d’angle est plus aigüe que la deuxième valeur d’angle. Avantageusement, l’angle le plus aigu se situe au niveau de la partie de la nervure qui est amenée à rencontrer en premier l’élément chauffant en cours d’insertion. Cette conformation offre à l’élément chauffant une rampe qui lui permet de glisser plus facilement en place de son logement et ce dès son premier contact avec le bord d’attaque. According to one aspect of the invention, the second angle value is sharper than the first angle value. Alternatively, the first angle value is sharper than the second angle value. Advantageously, the most acute angle is located at the part of the rib which is brought to meet first the heating element during insertion. This conformation provides the heating element with a ramp which allows it to slide more easily into place from its housing from its first contact with the leading edge.
Selon un aspect de l’invention, la première valeur d’angle et la deuxième valeur d’angle s’ouvrent graduellement depuis le premier montant vers la partie centrale, et depuis le deuxième montant vers la partie centrale. Dès lors, les valeurs d’angle augmentent progressivement depuis l’extérieur du logement vers le centre de celui-ci selon la direction latérale. According to one aspect of the invention, the first angle value and the second angle value open gradually from the first upright towards the central part, and from the second upright towards the central part. Consequently, the angle values gradually increase from the outside of the housing towards the center of the latter in the lateral direction.
Selon un aspect de l’invention, la partie centrale est au moins en partie rectiligne. La partie centrale s’étend globalement selon au moins un axe d’extension principal. Cet axe d’extension principal est transverse par rapport à l’axe l’allongement du logement. De façon spécifique, l’axe d’extension principal de la partie centrale est transverse et perpendiculaire à l’axe l’allongement du logement. According to one aspect of the invention, the central part is at least partly straight. The central part generally extends along at least one main extension axis. This main extension axis is transverse to the extension axis of the housing. Specifically, the main extension axis of the central part is transverse and perpendicular to the extension axis of the housing.
Selon un aspect de l’invention, la partie centrale est au moins en partie courbe. La forme de la partie centrale est celle de la face interne ou de la face externe. La forme de la partie centrale participe à la bonne rigidification de la nervure et donc du cadre. Elle contribue également à faciliter le démoulage du cadre. La courbe est caractérisée par un centre. La partie centrale peut avantageusement comporter au moins une région courbe et une région rectiligne. Avantageusement, la partie centrale est symétrique par rapport à un plan perpendiculaire au plan d’allongement principal longitudinal du cadre passant par l’axe d’allongement du logement. According to one aspect of the invention, the central part is at least partly curved. The shape of the central part is that of the internal face or the external face. The shape of the central part contributes to the good stiffening of the rib and therefore of the frame. It also helps to facilitate the release of the frame. The curve is characterized by a center. The central part can advantageously include at least one curved region and one rectilinear region. Advantageously, the central part is symmetrical with respect to a plane perpendicular to the longitudinal main elongation plane of the frame passing through the elongation axis of the housing.
Selon un aspect de l’invention, la partie centrale est uniquement courbe. Avantageusement, la partie centrale forme un C. According to one aspect of the invention, the central part is only curved. Advantageously, the central part forms a C.
Selon un aspect de l’invention, la face interne de la nervure comprend un dispositif de maintien en position de l’élément chauffant, en saillie de la nervure. Selon un exemple de réalisation, le dispositif de maintien en position est une pièce rapportée sur la nervure. Selon un exemple alternatif de réalisation, le dispositif de maintien en position est intégré à la nervure de sorte à être moulé en même temps que le reste du cadre et former partie intégrante de la structure monobloc du cadre. According to one aspect of the invention, the internal face of the rib comprises a device for holding the heating element in position, projecting from the rib. According to an exemplary embodiment, the device for holding in position is an insert on the rib. According to an alternative embodiment, the device for holding in position is integrated into the rib so as to be molded at the same time as the rest of the frame and form an integral part of the one-piece structure of the frame.
Le dispositif de maintien en position permet de mettre la partie centrale, la première partie latérale et la deuxième partie latérale de la nervure à distance de l’élément chauffant. Ainsi l’élément chauffant, une fois positionné dans son logement, n’entre pas en contact avec la face interne de la nervure si ce n’est par le dispositif de maintien en position. The position holding device allows the central part, the first lateral part and the second lateral part of the rib to be placed away from the heating element. Thus the heating element, once positioned in its housing, does not come into contact with the internal face of the rib except by the device for holding in position.
Une fois l’élément chauffant placé dans son logement, le dispositif de maintien en position évite le déplacement de l’élément chauffant au sein de ce logement. Des vibrations peuvent résulter de la mise en marche du véhicule, ou encore du passage du flux d’air : grâce au dispositif de maintien en position, l’élément chauffant n’en est pas impacté. Le dispositif de maintien assure ainsi la stabilité de l’élément chauffant dans son logement. De façon singulière, le dispositif de maintien permet de stabiliser l’élément chauffant entre la nervure et au moins un ergot porté par l’un et ou l’autre des montants du cadre. Cet ergot est disposé sur la face du cadre opposée à la face portant la nervure considérée. Once the heating element is placed in its housing, the device for holding it in position prevents the heating element from moving within this housing. Vibrations can result from starting the vehicle, or from the passage of the air flow: thanks to the holding device in position, the heating element is not affected. The holding device thus ensures the stability of the heating element in its housing. In a singular way, the holding device makes it possible to stabilize the heating element between the rib and at least one lug carried by one and or the other of the uprights of the frame. This lug is arranged on the face of the frame opposite the face carrying the rib in question.
Selon un aspect de l’invention, le dispositif de maintien en position de l’élément chauffant est porté par la partie centrale de la nervure. L’élément chauffant est ainsi maintenu en une zone médiane équidistante au premier montant et au deuxième montant du cadre. According to one aspect of the invention, the device for holding the heating element in position is carried by the central part of the rib. The heating element is thus maintained in a median zone equidistant from the first upright and the second upright of the frame.
Selon un aspect de l’invention, le dispositif de maintien en position de l’élément chauffant a un profil biseauté incliné vers le logement de l’élément chauffant. Le dispositif de maintien en position de l’élément chauffant est situé sur le trajet de l’élément chauffant lors de l’opération de montage. Un profil biseauté facilite l’insertion de l’élément chauffant. L’inclinaison du profil biseauté du dispositif de maintien est similaire à la partie de la nervure qui le porte. Lorsque le dispositif de maintien est porté par la partie centrale, le profil biseauté de ce dispositif de maintien adopte un angle de valeur similaire à la première valeur d’angle de la partie centrale. Lorsque le dispositif de maintien est porté par la première partie latérale ou la deuxième partie latérale, le profil biseauté de ce dispositif de maintien adopte un angle de valeur similaire à la deuxième valeur d’angle de la première partie latérale et de la deuxième partie latérale. According to one aspect of the invention, the device for holding the heating element in position has a bevelled profile inclined towards the housing of the heating element. The heater holding device is located in the path of the heater during the assembly operation. A bevelled profile facilitates the insertion of the heating element. The inclination of the beveled profile of the holding device is similar to the part of the rib which carries it. When the holding device is carried by the central part, the beveled profile of this holding device adopts an angle of value similar to the first angle value of the central part. When the holding device is carried by the first side part or the second side part, the beveled profile of this holding device adopts an angle of value similar to the second angle value of the first side part and the second side part. .
Selon un aspect de l’invention, le dispositif de maintien en position de l’élément chauffant est en contact avec l’élément chauffant. Le dispositif de maintien est en appui sur l’élément chauffant uniquement là où le dispositif de maintien est le plus épais. L’épaisseur du dispositif de maintien est mesurée perpendiculairement par rapport au plan d’ allongement principal longitudinal du cadre. Ainsi, une fois l’opération de montage réalisée, le contact entre la nervure et l’élément chauffant est localisé sur le dispositif de maintien en position de l’élément chauffant. According to one aspect of the invention, the device for holding the heating element in position is in contact with the heating element. The holding device is supported on the heating element only where the holding device is the thickest. The thickness of the holding device is measured perpendicular to the main longitudinal elongation plane of the frame. Thus, once the mounting operation has been carried out, the contact between the rib and the heating element is located on the device for holding the heating element in position.
Selon un aspect de l’invention, le dispositif de chauffage électrique comprend, sur la même face du cadre et entre le premier montant et le deuxième montant, la nervure et une nervure additionnelle disposées en série longitudinale et jointes en au moins une portion de jonction. La nervure et la nervure additionnelle sont disposées en série longitudinale c’est- à-dire l’une à la suite de l’autre dans la direction de l’axe longitudinal. Pour une nervure et une nervure additionnelle jointes, la nervure est plus proche de la première extrémité longitudinale du cadre comparé à la nervure additionnelle. According to one aspect of the invention, the electric heating device comprises, on the same face of the frame and between the first upright and the second upright, the rib and an additional rib arranged in longitudinal series and joined in at least one junction portion . The rib and the additional rib are arranged in a longitudinal series, that is to say one after the other in the direction of the longitudinal axis. For a joined rib and additional rib, the rib is closer to the first longitudinal end of the frame compared to the additional rib.
La nervure est en interaction avec l’élément chauffant au cours de l’opération de montage. Il importe selon l’invention que la nervure comporte un bord d’attaque biseauté sur lequel l’élément chauffant glisse. La nervure additionnelle, servant de renfort, n’en est pas nécessairement pourvue. The rib interacts with the heating element during the mounting operation. It is important according to the invention that the rib has a beveled leading edge over which the heating element slides. The additional rib, serving as a reinforcement, is not necessarily provided with it.
Selon un aspect de l’invention, la portion de jonction est située dans la partie centrale de la nervure. La nervure et la nervure additionnelle se rejoignent au niveau de la portion de jonction. Ainsi, la partie centrale de la nervure se fond avec une partie centrale de la nervure additionnelle. Selon un aspect de l’invention, la nervure et la nervure additionnelle présentent des formes distinctes. Par exemple, la nervure peut être courbe alors que la nervure additionnelle est droite. Alternativement, la nervure et la nervure additionnelle présentent des formes symétriques par rapport à un axe transversal passant par la zone de jonction. According to one aspect of the invention, the junction portion is located in the central part of the rib. The rib and the additional rib meet at the junction portion. Thus, the central part of the rib merges with a central part of the additional rib. According to one aspect of the invention, the rib and the additional rib have distinct shapes. For example, the rib may be curved while the additional rib is straight. Alternatively, the rib and the additional rib have symmetrical shapes with respect to a transverse axis passing through the junction zone.
Selon un aspect de l’invention, la portion de jonction porte au moins un dispositif de maintien en position de l’élément chauffant. Un unique dispositif de maintien peut être centré sur la portion de jonction. Alternativement, une pluralité de dispositifs de maintien est répartie sur la portion de jonction. According to one aspect of the invention, the junction portion carries at least one device for holding the heating element in position. A single holding device can be centered on the junction portion. Alternatively, a plurality of holding devices is distributed over the junction portion.
L’invention concerne également un dispositif de chauffage électrique comprenant un cadre tel que précédemment décrit et au moins un élément chauffant logé dans le logement du cadre. L’élément chauffant est disposé dans un logement du cadre dans lequel il est placé lors de l’opération de montage. L’élément chauffant occupe la majeure partie du logement : l’élément chauffant est dimensionné de façon légèrement inférieure au logement. Lorsqu’il est installé dans le logement, l’élément chauffant vient en butée du cadre du côté de la deuxième extrémité longitudinale. Une fois inséré via la première extrémité longitudinale du cadre, l’élément chauffant est maintenu dans le cadre par l’obturation de la première extrémité longitudinale, notamment par fixation d’une interface de connexion électrique. The invention also relates to an electric heating device comprising a frame as previously described and at least one heating element housed in the housing of the frame. The heating element is placed in a housing in the frame in which it is placed during the mounting operation. The heating element occupies most of the housing: the heating element is dimensioned slightly smaller than the housing. When installed in the housing, the heating element abuts the frame on the side of the second longitudinal end. Once inserted via the first longitudinal end of the frame, the heating element is held in the frame by closing off the first longitudinal end, in particular by fixing an electrical connection interface.
L’invention concerne également un boîtier d’installation de ventilation, de chauffage et/ou de climatisation pour véhicule comprenant un tel dispositif de chauffage électrique. Le flux d’air amené à traverser le boîtier peut ainsi être orienté pour circuler au travers du dispositif de chauffage électrique. The invention also relates to a ventilation, heating and / or air conditioning installation box for a vehicle comprising such an electric heating device. The air flow brought through the housing can thus be oriented to circulate through the electric heating device.
D'autres caractéristiques, détails et avantages de l'invention ressortiront plus clairement à la lecture de la description donnée ci-après à titre indicatif en relation avec des dessins dans lesquels : Other characteristics, details and advantages of the invention will emerge more clearly on reading the description given below by way of indication in relation to the drawings in which:
- la figure 1 est une vue générale, en perspective, d'un dispositif de chauffage électrique selon l’invention, rendant au moins visible un cadre selon un aspect de l’invention à l’intérieur duquel sont disposés deux éléments chauffants, FIG. 1 is a general perspective view of an electric heating device according to the invention, making at least a visible frame according to one aspect of the invention inside which two heating elements are arranged,
- la figure 2 est une vue en coupe longitudinale du dispositif de chauffage électrique selon l’invention présenté en figure 1, un logement à travers laquelle la coupe est réalisée étant ici dépourvu d’élément chauffant pour rendre visible les formes des nervures associées à ce logement, - Figure 2 is a longitudinal sectional view of the electric heating device according to the invention presented in Figure 1, a housing through which the cut is made being here devoid of heating element to make visible the shapes of the associated ribs to this accommodation,
- la figure 3 est une vue de face d’un cadre de dispositif de chauffage électrique selon l’invention, dans un deuxième mode de réalisation, illustré lors d’une opération de montage d’un élément chauffant à l’intérieur d’un logement ménagé dans ce cadre, - Figure 3 is a front view of an electric heating device frame according to the invention, in a second embodiment, illustrated during an operation of mounting a heating element inside a housing provided in this context,
- la figure 4 est une vue du cadre et de l’élément chauffant de la figure 3, en coupe longitudinale et vue de côté. - Figure 4 is a view of the frame and the heating element of Figure 3, in longitudinal section and side view.
Il faut tout d’abord noter que les figures exposent l’invention de manière détaillée pour mettre en œuvre l’invention, lesdites figures pouvant bien entendu servir à mieux définir l’invention le cas échéant. It should first of all be noted that the figures show the invention in detail in order to implement the invention, said figures can of course be used to better define the invention if necessary.
Dans la suite de la description, les dénominations longitudinales, transversales ou latérales, dessus, dessous, devant, derrière se réfèrent à l'orientation de l’élément chauffant ou du cadre du dispositif de chauffage électrique selon l’invention. La direction longitudinale correspond à l'axe longitudinal dans lequel s’étend le logement du cadre, et selon lequel sont insérés les éléments chauffants dans ce cadre, alors que les orientations transversales et latérales correspondent à des droites concourantes, c’est-à-dire qui croisent la direction longitudinale, notamment perpendiculaires à l'axe longitudinal du logement. Les dénominations extérieure ou intérieure s'apprécient par rapport à la structure du cadre, la dénomination intérieure correspondant au logement ménagé entre les parois définissant cette structure. In the following description, the longitudinal, transverse or lateral names, above, below, in front, behind, refer to the orientation of the heating element or of the frame of the electric heating device according to the invention. The longitudinal direction corresponds to the longitudinal axis in which the housing of the frame extends, and along which the heating elements are inserted in this frame, while the transverse and lateral orientations correspond to concurrent lines, that is to say say which cross the longitudinal direction, in particular perpendicular to the longitudinal axis of the housing. The exterior or interior designations can be assessed in relation to the structure of the frame, the interior designation corresponding to the housing formed between the walls defining this structure.
En se référant tout d’abord à la figure 1, on voit un dispositif de chauffage électrique 1 comprenant un cadre 3 définissant deux logements 4 dans lesquels sont logés des éléments chauffants 2. Le cadre 3 s’étend selon un plan A d’allongement principal longitudinal. Il est configuré pour chauffer un flux d’air FA circulant transversalement par rapport au plan A d’allongement principal longitudinal. Referring first to Figure 1, there is shown an electric heating device 1 comprising a frame 3 defining two housings 4 in which are housed heating elements 2. The frame 3 extends along a plane A of elongation main longitudinal. It is configured to heat an air flow FA circulating transversely to the plane A of the main longitudinal extension.
Les éléments chauffants 2 comportent des ailettes métalliques 35 au contact d’éléments résistifs qui prennent notamment la forme de pierres céramiques 6 à effet PTC et qui génèrent de la chaleur sous l’effet d’une alimentation électrique des éléments chauffants, la chaleur étant par ailleurs diffusée par les ailettes métalliques 35. Chaque logement 4 s’étend selon un axe longitudinal X. Les éléments chauffants 2 sont dimensionnés pour pouvoir être disposés dans les logements 4 ménagés dans le cadre 3. Le cadre 3 comporte deux faces 5 ajourées de sorte à permettre la circulation du flux d’air FA à travers le dispositif de chauffage électrique 1. Chaque face 5 ajourée ouvre ainsi sur les logements 4 pour que le flux d’air FA traverse les éléments chauffants 2. Lorsque le flux d’air FA traverse le dispositif de chauffage électrique 1 de part en part, entrant par une face 5 et ressortant de l’autre face 5 qui lui est opposée, la chaleur diffusée par les éléments chauffants 2 est transmise au flux d’air FA entrant à leur contact. The heating elements 2 include metal fins 35 in contact with resistive elements which in particular take the form of ceramic stones 6 with PTC effect and which generate heat under the effect of an electrical supply to the heating elements, the heat being by elsewhere diffused by the metal fins 35. Each housing 4 extends along a longitudinal axis X. The heating elements 2 are dimensioned so as to be able to be arranged in the housing 4 formed in the frame 3. The frame 3 has two openwork faces 5 so as to allow the flow of the air flow FA through the electric heating device 1. Each open face 5 thus opens onto the housings 4 so that the air flow FA passes through the elements heaters 2. When the air flow FA passes through the electric heating device 1 right through, entering through one face 5 and emerging from the other face 5 which is opposite to it, the heat diffused by the heating elements 2 is transmitted to the FA air flow entering them.
Le cadre 3 comporte une première extrémité longitudinale 7 dotée d’une ouverture pour permettre l’insertion des éléments chauffants 2 dans le logement 4 et une deuxième extrémité longitudinale 8 opposée à la première extrémité longitudinale 7. En l’espèce, les éléments chauffants 2 sont déjà installés dans leurs logements 4 respectifs. L’ouverture de la première extrémité longitudinale 7 est ici obturée par un couvercle 9 intégrant une connectique électrique 31, le couvercle 9 étant emboîté sur la première extrémité longitudinale 7 du cadre. La deuxième extrémité longitudinale 8 ferme longitudinalement les logements 4 en formant une paroi de fond apte à maintenir les éléments chauffants 2. The frame 3 has a first longitudinal end 7 provided with an opening to allow the insertion of the heating elements 2 into the housing 4 and a second longitudinal end 8 opposite the first longitudinal end 7. In this case, the heating elements 2 are already installed in their respective housings 4. The opening of the first longitudinal end 7 is here closed by a cover 9 integrating an electrical connection 31, the cover 9 being fitted on the first longitudinal end 7 of the frame. The second longitudinal end 8 longitudinally closes the housings 4 by forming a bottom wall capable of holding the heating elements 2.
Chaque logement 4 est bordé latéralement par un premier montant 10 du cadre 3 et par un deuxième montant 11 du cadre 3, le premier montant 10 et le deuxième montant 11 étant sensiblement parallèles à l’axe longitudinal X. Each housing 4 is bordered laterally by a first upright 10 of the frame 3 and by a second upright 11 of the frame 3, the first upright 10 and the second upright 11 being substantially parallel to the longitudinal axis X.
Entre le premier montant 10 et le deuxième montant 11, le cadre 3 comporte au moins une nervure 12, 13 permettant notamment de rigidifier le cadre ajouré. Plus particulièrement, le cadre 3 peut comporter une nervure 12 et une nervure additionnelle 13, jointes et organisées par paire, chaque nervure permettant de rigidifier le cadre ajouré. La nervure additionnelle 13 est agencée en série de façon longitudinale avec la nervure 12, de sorte que la nervure et la nervure additionnelle sont disposées l’une après l’autre selon l’axe longitudinal X. Between the first upright 10 and the second upright 11, the frame 3 comprises at least one rib 12, 13 in particular making it possible to stiffen the perforated frame. More particularly, the frame 3 may include a rib 12 and an additional rib 13, joined and organized in pairs, each rib making it possible to stiffen the perforated frame. The additional rib 13 is arranged in series longitudinally with the rib 12, so that the rib and the additional rib are arranged one after the other along the longitudinal axis X.
Dans le cas illustré dans la figure 1, le cadre 3 comporte plusieurs nervures 12 et nervures additionnelles 13, organisées par paires. Chacune des nervures présente ici une courbure unique en forme de C. In the case illustrated in FIG. 1, the frame 3 comprises several ribs 12 and additional ribs 13, organized in pairs. Each of the ribs here has a unique C-shaped curvature.
La nervure 12 et la nervure additionnelle 13 participent, avec le premier montant 10 et le deuxième montant 11, à délimiter le logement 4, la nervure 12 et la nervure additionnelle 13 participant à délimiter le logement selon la direction transversale correspondant à la direction d’écoulement du flux d’air FA. Le premier montant 10 et le deuxième montant 11 portent par ailleurs des ergots 14 sur lesquels les éléments chauffants 2 peuvent prendre appui. Les ergots 14 s’étendent en saillie du premier montant 10 et du deuxième montant 11 pour former butée aux éléments chauffants en travers de la face 5 ajourée. The rib 12 and the additional rib 13 participate, with the first upright 10 and the second upright 11, in delimiting the housing 4, the rib 12 and the additional rib 13 participating in delimiting the housing in the transverse direction corresponding to the direction of flow of the air flow FA. The first upright 10 and the second upright 11 also carry lugs 14 on which the heating elements 2 can bear. The pins 14 project from the first upright 10 and the second upright 11 to form a stop for the heating elements across the perforated face 5.
Le cadre 3 comporte par ailleurs deux extrémités latérales 15. Une partie centrale 16 sépare les logements 4 et concourt à la structure du cadre 3. Le premier montant 10, le deuxième montant 11, les premières nervures 12, les deuxièmes nervures 13, les deux extrémités latérales 15 du cadre et la partie centrale 16 du cadre 3 sont indissociables, de sorte à constituer une structure monobloc obtenue par exemple par moulage. Le couvercle 9 est par ailleurs une pièce rapportée sur le cadre 3. The frame 3 also has two lateral ends 15. A central part 16 separates the housings 4 and contributes to the structure of the frame 3. The first upright 10, the second upright 11, the first ribs 12, the second ribs 13, the two lateral ends 15 of the frame and the central part 16 of the frame 3 are inseparable, so as to constitute a one-piece structure obtained for example by molding. The cover 9 is also an added piece on the frame 3.
La figure 2 montre le dispositif de chauffage électrique 1 selon l’invention, dans le premier mode de réalisation présenté en figure 1, sous l’angle de la coupe B-B. La vue ici représentée est similaire à ce qui a été décrit pour la figure 1. Pour la compréhension de la figure 2 et sa mise en œuvre, le lecteur se reportera à la description de la figure 1. Dans un souci de lisibilité de la figure, les éléments chauffants 2 normalement présents dans le logement 4 traversé par la coupe B-B ont été supprimés. FIG. 2 shows the electric heating device 1 according to the invention, in the first embodiment presented in FIG. 1, under the angle of section B-B. The view here represented is similar to what has been described for FIG. 1. For the understanding of FIG. 2 and its implementation, the reader will refer to the description of FIG. 1. For the sake of readability of the figure , the heating elements 2 normally present in the housing 4 through which the section BB has been removed.
La nervure 12 comprend une partie centrale 18, une première partie latérale 19 reliée d’une part au premier montant 10 du cadre 3 et d’autre part à la partie centrale 18, ainsi qu’une deuxième partie latérale 20, visible sur les figures 1 et 3, et reliée au deuxième montant 11 du cadre 3 et à cette partie centrale 18. The rib 12 comprises a central part 18, a first lateral part 19 connected on the one hand to the first upright 10 of the frame 3 and on the other hand to the central part 18, as well as a second lateral part 20, visible in the figures. 1 and 3, and connected to the second upright 11 of the frame 3 and to this central part 18.
Tel que cela a été précisé précédemment, la nervure 12 présente ici une courbure unique en forme de C. Elle est par ailleurs caractérisée par sa dimension longitudinale « h » définissant la première partie latérale 19 et la deuxième partie latérale 20 qui est plus grande que la dimension longitudinale « H » définissant la partie centrale 18. As previously stated, the rib 12 here has a single C-shaped curvature. It is further characterized by its longitudinal dimension "h" defining the first lateral part 19 and the second lateral part 20 which is larger than the longitudinal dimension "H" defining the central part 18.
La nervure 12 comprend par ailleurs une face externe 21 et une face interne opposée et orientée vers l’intérieur du cadre, c’est-à-dire vers le logement et l’élément chauffant qui y est logé. La face interne et la face externe sont reliées à leurs extrémités longitudinales par un bord d’attaque 22 et une bordure 23 opposée au bord d’attaque 22. The rib 12 also comprises an external face 21 and an opposite internal face oriented towards the inside of the frame, that is to say towards the housing and the heating element which is housed therein. The internal face and the external face are connected at their longitudinal ends by a leading edge 22 and a border 23 opposite the leading edge 22.
Selon l’invention, le bord d’attaque 22 de la nervure 12, c’est-à-dire le bord de la nervure le plus proche de la première extrémité longitudinale par laquelle sont insérés les éléments chauffants dans le cadre, comporte un biseau 25 formant rampe inclinée vers le logement 4 de l’élément chauffant 2. Le biseau 25 est configuré pour former au moins une pente qui s’étend depuis le bord d’attaque 22 vers la face interne de la nervure. According to the invention, the leading edge 22 of the rib 12, that is to say the edge of the rib closest to the first longitudinal end by which are inserted the heating elements in the frame, comprises a bevel 25 forming an inclined ramp towards the housing 4 of the heating element 2. The bevel 25 is configured to form at least one slope which extends from the leading edge 22 towards the internal face of the rib.
Dans le mode de réalisation illustré sur la figure 2, le bord d’attaque 22 est configuré de sorte que le biseau 25 présente une double pente, à savoir une première pente 32, pente principale du bord d’attaque 22, et une deuxième pente 33. La première pente 32 et la deuxième pente 32 se rejoignent en une ligne de jonction 34 des pentes 32, 33. La ligne de jonction 34 est plus éloignée du logement 4 que de l’extérieur du cadre 3. In the embodiment illustrated in FIG. 2, the leading edge 22 is configured so that the bevel 25 has a double slope, namely a first slope 32, main slope of the leading edge 22, and a second slope 33. The first slope 32 and the second slope 32 meet at a junction line 34 of the slopes 32, 33. The junction line 34 is more distant from the housing 4 than from the outside of the frame 3.
Le biseau 25 et notamment l’angle de celui-ci, c’est-à-dire l’inclinaison de la pente guidant les éléments chauffants vers l’intérieur du cadre lors de l’insertion, est ici différent entre la partie centrale 18 et les parties latérales 19, 20. Le biseau est ainsi configuré de manière à présenter une première valeur d’angle « al » au niveau de la partie centrale 18 et une deuxième valeur d’angle « a2 » au niveau des parties latérales 19, 20, différente de la première valeur d’angle « al » pour une même nervure 12. The bevel 25 and in particular the angle thereof, that is to say the inclination of the slope guiding the heating elements towards the interior of the frame during insertion, is here different between the central part 18 and the side parts 19, 20. The bevel is thus configured so as to have a first angle value "a1" at the level of the central part 18 and a second angle value "a2" at the level of the side parts 19, 20, different from the first angle value "al" for the same rib 12.
De façon particulière, lors de l’opération de montage, l’élément chauffant 2 en insertion dans le logement 4 du cadre 3 est amené à rencontrer de façon concomitante la première partie latérale 19 et la deuxième partie latérale 20, avant la partie centrale 18, la première partie latérale 19 et la deuxième partie latérale 20 étant plus proche de la première extrémité longitudinale 7. In particular, during the mounting operation, the heating element 2 inserted into the housing 4 of the frame 3 is caused to concomitantly meet the first side part 19 and the second side part 20, before the central part 18 , the first lateral part 19 and the second lateral part 20 being closer to the first longitudinal end 7.
Dans l’exemple illustré, depuis le premier montant 11 vers la partie centrale 18 de la nervure 12, l’angle formé par le biseau 25 est croissant. La deuxième valeur d’angle « a2 » dans la première partie latérale 19 et dans la deuxième partie latérale 20 est plus aigüe que la première valeur d’angle « al » dans la partie centrale 18. La deuxième valeur d’angle « a2 » et la première valeur d’angle « al » sont par ailleurs variables et croissantes de sorte à accompagner la progression de l’élément chauffant 2 glissant contre le bord d’attaque 22. Par croissantes on entend que la deuxième valeur d’angle « a2 » et la première valeur d’angle « al » s’ouvrent graduellement depuis le premier montant 10 vers la partie centrale 18, et depuis le deuxième montant 11 vers la partie centrale 18. On comprend que plus la valeur d’angle progresse, ou s’ouvre, plus la rampe est prononcée par rapport au plan A d’allongement principal longitudinal et plus le guidage de l’élément chauffant vers l’intérieur du cadre est prononcé. La nervure additionnelle 13 comprend une partie centrale 28, une première partie latérale 29 reliée au premier montant 10 du cadre 3 et une deuxième partie latérale 30 est reliée au deuxième montant 11 du cadre 3. La nervure additionnelle 13 participe à la rigidification du cadre 3 sans influer sur l’insertion de l’élément chauffant 2, contrairement à la nervure 12. In the example illustrated, from the first upright 11 towards the central part 18 of the rib 12, the angle formed by the bevel 25 is increasing. The second angle value "a2" in the first lateral part 19 and in the second lateral part 20 is sharper than the first angle value "al" in the central part 18. The second angle value "a2" and the first angle value "al" are also variable and increasing so as to accompany the progression of the heating element 2 sliding against the leading edge 22. By increasing is meant that the second angle value "a2 "And the first angle value" al "open gradually from the first upright 10 towards the central part 18, and from the second upright 11 towards the central part 18. It is understood that the more the angle value progresses, or opens, the more pronounced the ramp relative to the plane A of longitudinal main elongation, the more pronounced the guiding of the heating element towards the inside of the frame. The additional rib 13 comprises a central part 28, a first lateral part 29 connected to the first upright 10 of the frame 3 and a second lateral part 30 is connected to the second upright 11 of the frame 3. The additional rib 13 participates in the stiffening of the frame 3 without affecting the insertion of the heating element 2, unlike the rib 12.
Dans l’exemple illustré, la partie centrale 18 de la nervure 12 décrit une courbe et la partie centrale 28 de la nervure additionnelle 13 décrit également une courbe. Ces deux courbes sont agencées selon des orientations inverses, de sorte à ce qu’une portion de la partie centrale 18 se confonde avec une portion de la partie centrale 28. Le lieu de rencontre de la nervure 12 et de la nervure additionnelle 13 correspond à une portion de jonction 26. Plus particulièrement, la nervure 12 et la nervure additionnelle 13 sont en forme de C, symétriques l’une l’autre par rapport à la portion de jonction 26. In the example illustrated, the central part 18 of the rib 12 describes a curve and the central part 28 of the additional rib 13 also describes a curve. These two curves are arranged in opposite directions, so that a portion of the central portion 18 merges with a portion of the central portion 28. The meeting point of the rib 12 and the additional rib 13 corresponds to a junction portion 26. More particularly, the rib 12 and the additional rib 13 are C-shaped, symmetrical to each other with respect to the junction portion 26.
La nervure 12 et la nervure additionnelle 13 comprennent au moins un dispositif 27 de maintien en position de l’élément chauffant 2, en saillie de la portion de jonction 26 de la nervure 12 et de la nervure additionnelle 13, du côté de l’élément chauffant 2. Dans l’exemple illustré, deux dispositifs de maintien en position sont disposés dans cette portion de jonction 26. Ce ou ces dispositifs 27 de maintien en position de l’élément chauffant 2 sont destinés à être en contact avec l’élément chauffant 2. The rib 12 and the additional rib 13 comprise at least one device 27 for holding the heating element 2 in position, projecting from the junction portion 26 of the rib 12 and the additional rib 13, on the side of the element. heater 2. In the example illustrated, two devices for holding in position are disposed in this junction portion 26. This or these devices 27 for holding in position of the heating element 2 are intended to be in contact with the heating element 2.
Le ou les dispositifs 27 de maintien en position de l’élément chauffant 2 présentent, au moins sur leur face en regard de la première extrémité longitudinale du cadre, un profil biseauté formant plan incliné là également vers le logement 4 de l’élément chauffant 2. Ce profil est incliné selon un angle de valeur correspondant à la première valeur d’angle « al » du biseau 25 pris au niveau de la partie centrale 18 du bord d’attaque 22 de la nervure 12. The device (s) 27 for holding the heating element 2 in position have, at least on their face opposite the first longitudinal end of the frame, a beveled profile forming an inclined plane there also towards the housing 4 of the heating element 2 This profile is inclined at an angle of value corresponding to the first angle value "al" of the bevel 25 taken at the level of the central part 18 of the leading edge 22 of the rib 12.
La nervure 12 et la nervure additionnelle 13 sont portées par l’une ou l’autre des faces 5 ajourées du cadre 3. Une paire de nervures 12, 13 d’une face 5 peut notamment être positionnée de façon alternée par rapport à une autre paire de nervures 12, 13 portée que l’autre face 5. The rib 12 and the additional rib 13 are carried by one or the other of the perforated faces 5 of the frame 3. A pair of ribs 12, 13 of a face 5 can in particular be positioned alternately with respect to another pair of ribs 12, 13 carried than the other face 5.
Pour une nervure ou paire de nervures portées sur une face du cadre, la face opposée peut porter une paire d’ergots 14 agencés en saillie respectivement du premier montant 10 et du deuxième montant 11. On comprend que ces ergots 14 participent à former obstacle au dégagement transversal de l’élément chauffant, l’élément chauffant 2 étant destiné à prendre appui sur le dispositif 27 de maintien en position de l’élément chauffant 2 porté par la paire de nervure 12, 13 d’une face et/ou sur ces ergots 14 portés au niveau de l’autre face. For a rib or pair of ribs carried on one face of the frame, the opposite face can carry a pair of lugs 14 projecting respectively from the first upright 10 and the second upright 11. It is understood that these lugs 14 participate in forming an obstacle to transverse release of the heating element, the heating element 2 being intended to bear on the device 27 for holding in position the heating element 2 carried by the pair of ribs 12, 13 on one side and / or on these pins 14 carried on the other side.
Les figures 3 et 4 présentent le dispositif de chauffage électrique 1 illustré lors d’une opération de montage, au cours de l’insertion des éléments chauffants 2 et des pierres à effet PTC 6 associés dans le logement 4. Pour faciliter la lecture de cette figure 3, seule une partie du cadre 3, entre le premier montant 10 et le deuxième montant 11, a été représentée. Figures 3 and 4 show the electric heating device 1 illustrated during an assembly operation, during the insertion of the heating elements 2 and associated PTC effect stones 6 in the housing 4. To facilitate reading of this FIG. 3, only part of the frame 3, between the first upright 10 and the second upright 11, has been shown.
Les figures 3 et 4 montrent un deuxième mode de réalisation du cadre 3, qui diffère de ce qui a précédemment été décrit en ce que les nervures disposées en série longitudinale sont des nervures 12 seules. Toutes les nervures 12 sont identiques et réparties de façon homogène sur la face 5 ajourée du cadre 3. Cependant, l’opération de montage illustrée est valable pour tous les modes de réalisation de l’invention, que le cadre 3 soit pourvu des seules nervures 12 ou des nervures 12 jointes aux nervures additionnelles 13 tel que précédemment décrit, et quelle que soit la disposition ou la forme des nervures 12 entrant dans le cadre de l’invention. Figures 3 and 4 show a second embodiment of the frame 3, which differs from what has previously been described in that the ribs arranged in longitudinal series are ribs 12 alone. All the ribs 12 are identical and distributed homogeneously on the perforated face 5 of the frame 3. However, the illustrated mounting operation is valid for all the embodiments of the invention, that the frame 3 is provided with only the ribs 12 or ribs 12 joined to the additional ribs 13 as previously described, and whatever the arrangement or the shape of the ribs 12 coming within the scope of the invention.
Comme cela a été décrit dans le premier mode de réalisation présenté en figures 1 et 2, chaque nervure 12 se divise en une partie centrale 18, une première partie latérale 19 et une deuxième partie latérale 20, et chaque nervure 12 dispose d’une face externe 21, tournée vers l’extérieur du cadre et à l’opposé des éléments chauffants, d’un bord d’attaque 22 et d’une bordure 23 opposée au bord d’attaque 22. La nervure 12 dispose aussi d’une face interne 24, tournée en regard des logements des éléments chauffants. As described in the first embodiment presented in Figures 1 and 2, each rib 12 is divided into a central part 18, a first lateral part 19 and a second lateral part 20, and each rib 12 has a face external 21, facing outwards from the frame and opposite the heating elements, a leading edge 22 and an edge 23 opposite the leading edge 22. The rib 12 also has a face internal 24, facing the housing of the heating elements.
Dans le deuxième mode de réalisation, la nervure 12 est globalement rectiligne, que ce soit au niveau de sa partie centrale 18, de sa première partie latérale 19 ou de sa deuxième partie latérale 20. La nervure 12 forme une bande perpendiculaire à l’axe longitudinal X et présentant une dimension longitudinale H homogène de valeur constante, la dimension longitudinale étant mesurée selon l’axe longitudinal X du logement 4 entre le bord d’attaque 22 et la bordure 23 de la nervure 12 côté face externe 21. Cette conformation n’est cependant pas limitative : la partie centrale 18, la première partie latérale 19 et/ou la deuxième partie latérale 20 pourraient prendre des formes différentes de celle ici décrite, et pourraient être différentes les unes des autres. De même, elles pourraient prendre des orientations différentes. Tel que cela a pu être décrit précédemment en référence à un premier mode de réalisation, un ou plusieurs dispositifs de maintien en position peuvent être portés par la face interne de la nervure 12, par exemple au niveau de sa partie centrale 18. In the second embodiment, the rib 12 is generally rectilinear, whether at its central part 18, its first lateral part 19 or its second lateral part 20. The rib 12 forms a strip perpendicular to the axis longitudinal X and having a homogeneous longitudinal dimension H of constant value, the longitudinal dimension being measured along the longitudinal axis X of the housing 4 between the leading edge 22 and the edge 23 of the rib 12 on the outer face side 21. This conformation n is however not limiting: the central part 18, the first lateral part 19 and / or the second lateral part 20 could take different forms from that described here, and could be different from each other. Likewise, they could take different directions. As may have been described above with reference to a first embodiment, one or more devices for holding in position can be carried by the internal face of the rib 12, for example at its central part 18.
L’insertion de l’élément chauffant 2 se fait par la première extrémité longitudinale 7, illustrée ouverte, en l’absence de couvercle 9. La direction prise par l’élément chauffant 2 au cours de son insertion est signifiée par une flèche 17. The heating element 2 is inserted by the first longitudinal end 7, shown open, in the absence of a cover 9. The direction taken by the heating element 2 during its insertion is indicated by an arrow 17.
La figure 4 illustre le dispositif de chauffage électrique 1 selon l’invention présenté en figure 3 selon une coupe A- A. La coupe A-A est perpendiculaire au plan A d’allongement principal longitudinal du dispositif de chauffage électrique 1 et passe par l’axe longitudinal X du logement 4. Ainsi, la coupe A-A passe notamment par la partie centrale 18 de chaque nervure 12. FIG. 4 illustrates the electric heating device 1 according to the invention presented in FIG. 3 according to a section A- A. The section AA is perpendicular to the plane A of longitudinal main elongation of the electric heating device 1 and passes through the axis longitudinal X of the housing 4. Thus, the section AA in particular passes through the central part 18 of each rib 12.
Le bord d’attaque 22 de la nervure 12 comporte un biseau 25 formant rampe inclinée vers le logement 4 de l’élément chauffant 2. Le biseau 25 ne comporte ici qu’une unique pente 32 formée entre la face externe 21 et le bord d’attaque 22. Cette pente 32 est caractérisée ici par une valeur d’angle « al2 » constante sur toute la dimension latérale d’une même nervure 12, et sur l’ensemble des nervures 12 du logement 4 considéré. La bordure 23 est quant à elle perpendiculaire à l’axe longitudinal X. The leading edge 22 of the rib 12 has a bevel 25 forming an inclined ramp towards the housing 4 of the heating element 2. The bevel 25 here has only a single slope 32 formed between the external face 21 and the edge d 'attack 22. This slope 32 is characterized here by an angle value "a12" constant over the entire lateral dimension of the same rib 12, and over all of the ribs 12 of the housing 4 considered. The border 23 is perpendicular to the longitudinal axis X.
Le biseau 25 est incliné de sorte à ce que le bord d’attaque 22 soit plus proche longitudinalement de la première extrémité longitudinale 7 côté face externe 21 que côté face interne 24. The bevel 25 is inclined so that the leading edge 22 is closer longitudinally to the first longitudinal end 7 on the outer face side 21 than on the inner face side 24.
La coupe A-A illustre un élément chauffant 2, et les pierres à effet PTC 6 associés, qui susceptible de dévier de sa trajectoire, lors de l’opération d’insertion, comme représenté par la flèche 17. L’élément chauffant 2 est désaxé par rapport à l’axe longitudinal X comme visible sur la figure 4. Dans cette configuration, l’élément chauffant 2 rencontre l’une des nervures 12 et plus particulièrement son bord d’attaque tournée vers la première extrémité longitudinale. Grâce au biseau 25 du bord d’attaque 22 et l’orientation du plan incliné qu’il participe à former, l’élément chauffant 2 glisse vers l’intérieur du logement, dirigé selon l’inclinaison du biseau 25 de sorte à se centrer sur l’axe longitudinal X du logement 4. Section AA illustrates a heating element 2, and the associated PTC effect stones 6, which may deviate from its trajectory, during the insertion operation, as shown by arrow 17. The heating element 2 is offset by relative to the longitudinal axis X as visible in FIG. 4. In this configuration, the heating element 2 meets one of the ribs 12 and more particularly its leading edge facing the first longitudinal end. Thanks to the bevel 25 of the leading edge 22 and the orientation of the inclined plane which it participates in forming, the heating element 2 slides towards the interior of the housing, directed according to the inclination of the bevel 25 so as to center on the longitudinal axis X of the housing 4.
On comprend de ce qui précède que dans le cas d’une nervure dont le bord d’attaque est biseauté de manière à former deux pentes tel qu’évoqué en référence à la figure 2, l’élément chauffant est amené à entrer en contact le cas échéant avec la première pente 32, c’est-à-dire la pente tournée vers l’intérieur du logement, de sorte que là également, la forme biseautée du bord d’attaque permet le guidage de l’élément chauffant vers l’intérieur du cadre et son logement. On comprend à la lecture de ce qui précède que la présente invention propose un cadre de dispositif de chauffage électrique configuré pour faciliter son montage. Ce cadre de dispositif de chauffage électrique, destiné notamment à être intégré dans une installation de ventilation, de chauffage, et/ou de climatisation de véhicules automobiles, permet d’insérer sans heurts un élément chauffant au sein du cadre en vue de former le dispositif de chauffage électrique. L’opération de montage est plus aisée quel que soit le mode de réalisation de l’invention, grâce à la nervure biseauté. We understand from the above that in the case of a rib whose leading edge is bevelled so as to form two slopes as mentioned with reference to FIG. 2, the heating element is brought into contact if necessary with the first slope 32, that is to say the slope facing the interior of the housing, so that here too, the bevelled shape of the leading edge allows the heating element to be guided towards the inside of the frame and its housing. It will be understood from reading the above that the present invention provides an electric heating device frame configured to facilitate its mounting. This electric heating device frame, intended in particular to be integrated in a ventilation, heating, and / or air conditioning installation of motor vehicles, makes it possible to smoothly insert a heating element within the frame in order to form the device. electric heating. The mounting operation is easier whatever the embodiment of the invention, thanks to the bevelled rib.
L’invention ne saurait toutefois se limiter aux moyens et configurations décrits et illustrés ici, et elle s’étend également à tout moyen ou configuration équivalents et à toute combinaison technique opérant de tels moyens. En particulier, la forme du cadre de dispositif de chauffage électrique peut être modifiée sans nuire à l’invention, dans la mesure où le cadre de dispositif de chauffage électrique pour véhicule, in fine , remplit les mêmes fonctionnalités que celles décrites dans ce document. The invention cannot however be limited to the means and configurations described and illustrated here, and it also extends to any equivalent means or configuration and to any technical combination operating such means. In particular, the shape of the electric heating device frame can be modified without harming the invention, insofar as the electric heating device frame for a vehicle, ultimately, fulfills the same functions as those described in this document.

Claims

REVENDICATIONS
1. Cadre (3) de dispositif de chauffage électrique (1) configuré pour chauffer un flux d’air (FA) circulant dans un boîtier d’installation de ventilation, de chauffage et/ou de climatisation de véhicule, le cadre (3) s’étendant selon un plan (A) d’allongement principal longitudinal et comprenant au moins un logement (4) s’étendant selon un axe longitudinal (X) et étant destiné à loger au moins un élément chauffant (2), le cadre (3) comportant deux faces (5) ajourées, une première extrémité longitudinale (7) permettant l’insertion de l’élément chauffant (2) dans le logement (4) et une deuxième extrémité longitudinale (8) opposée à la première extrémité longitudinale (7), au moins une nervure (12) avec une face interne (24) orientée vers le logement (4) du cadre (3) et une face externe (21) opposée à la face interne (24), la face interne (24) de la nervure (12) étant reliée à la face externe (21) de la nervure (12) par un bord d’attaque (22) orienté vers la première extrémité longitudinale (7) du cadre (3) et une bordure (23) opposée au bord d’attaque (22), caractérisé en ce que le bord d’attaque (22) de la nervure (12) comporte un biseau (25) formant rampe inclinée vers le logement (4) de l’élément chauffant (2). 1. Frame (3) of an electric heating device (1) configured to heat an air flow (FA) circulating in a vehicle ventilation, heating and / or air conditioning installation unit, the frame (3) extending along a plane (A) of longitudinal main elongation and comprising at least one housing (4) extending along a longitudinal axis (X) and being intended to accommodate at least one heating element (2), the frame ( 3) comprising two perforated faces (5), a first longitudinal end (7) allowing the insertion of the heating element (2) in the housing (4) and a second longitudinal end (8) opposite the first longitudinal end ( 7), at least one rib (12) with an internal face (24) oriented towards the housing (4) of the frame (3) and an external face (21) opposite the internal face (24), the internal face (24 ) of the rib (12) being connected to the external face (21) of the rib (12) by a leading edge (22) oriented towards the first longitudinal end (7) of the frame (3) and an edge (23) opposite the leading edge (22), characterized in that the leading edge (22) of the rib (12) has a bevel (25) forming an inclined ramp towards the housing (4) of the heating element (2).
2. Cadre (3) de dispositif de chauffage électrique (1) selon la revendication 1, dans lequel le logement (4) est bordé latéralement par un premier montant (10) du cadre (3) et par un deuxième montant (11) du cadre (3), le premier montant (10) et le deuxième montant (11) étant sensiblement parallèles à l’axe longitudinal (X), la nervure (12) comportant une partie centrale (18), une première partie latérale (19) reliée à la partie centrale (18) et au premier montant (10) du cadre (3) et une deuxième partie latérale (20) reliée à la partie centrale (18) et au deuxième montant (11) du cadre (3), le biseau (25) formant une pente inclinée d’une première valeur d’angle (al) dans la partie centrale (18) et d’une deuxième valeur d’angle (a2) dans la première partie latérale (19) et la deuxième partie latérale (20). 2. Frame (3) of an electric heating device (1) according to claim 1, in which the housing (4) is bordered laterally by a first upright (10) of the frame (3) and by a second upright (11) of the frame (3), the first upright (10) and the second upright (11) being substantially parallel to the longitudinal axis (X), the rib (12) comprising a central part (18), a first lateral part (19) connected to the central part (18) and to the first upright (10) of the frame (3) and a second lateral part (20) connected to the central part (18) and to the second upright (11) of the frame (3), the bevel (25) forming an inclined slope of a first angle value (a1) in the central part (18) and a second angle value (a2) in the first side part (19) and the second part side (20).
3. Cadre (3) de dispositif de chauffage électrique (1) selon la revendication 2, dans lequel la première valeur d’angle (al) est constante depuis la première partie latérale3. Frame (3) of electric heater (1) according to claim 2, wherein the first angle value (al) is constant from the first side part
(19) vers la deuxième partie latérale (20) et la deuxième valeur d’angle (a2) est constante depuis le premier montant (10) vers la partie centrale (18), et depuis le deuxième montant (11) vers la partie centrale (18). (19) towards the second lateral part (20) and the second angle value (a2) is constant from the first upright (10) towards the central part (18), and from the second upright (11) towards the central part (18).
4. Cadre (3) de dispositif de chauffage électrique (1) selon la revendication 2, dans lequel la première valeur d’angle (al) est variable depuis la première partie latérale (19) vers la deuxième partie latérale (20) et la deuxième valeur d’angle (a2) est variable depuis le premier montant (10) vers la partie centrale (18), et depuis le deuxième montant (11) vers la partie centrale (18). 4. Frame (3) of an electric heating device (1) according to claim 2, in which the first angle value (a1) is variable from the first lateral part (19) towards the second lateral part (20) and the second angle value (a2) is variable from the first upright (10) to the central part (18), and from the second upright (11) to the central part (18).
5. Cadre (3) de dispositif de chauffage électrique (1) selon l’une des revendications 2 à 4, dans lequel la deuxième valeur d’angle (a2) est plus aigüe que la première valeur d’angle (al). 5. Frame (3) of an electric heater (1) according to one of claims 2 to 4, in which the second angle value (a2) is more acute than the first angle value (al).
6. Cadre (3) de dispositif de chauffage électrique (1) selon l’une quelconque des revendications précédentes, dans lequel la face interne (24) de la nervure (12) comprend un dispositif (27) de maintien en position de l’élément chauffant (2), en saillie de la nervure (12). 6. Frame (3) of an electric heating device (1) according to any one of the preceding claims, in which the internal face (24) of the rib (12) comprises a device (27) for holding the position of the heating element (2), projecting from the rib (12).
7. Cadre (3) de dispositif de chauffage électrique (1) selon la revendication précédente, dans lequel le dispositif (27) de maintien en position de l’élément chauffant (2) a un profil biseauté incliné vers le logement (4) de l’élément chauffant (2). 7. Frame (3) of an electric heating device (1) according to the preceding claim, in which the device (27) for holding in position the heating element (2) has a bevelled profile inclined towards the housing (4) of the heating element (2).
8. Cadre (3) de dispositif de chauffage électrique (1) selon l’une quelconque des revendications précédentes, comprenant, sur la même face (5) du cadre (3) et entre le premier montant (10) et le deuxième montant (11), la nervure (12) et une nervure additionnelle (13) disposées en série longitudinale et jointes en au moins une portion de jonction (26). 8. Frame (3) of an electric heating device (1) according to any one of the preceding claims, comprising, on the same face (5) of the frame (3) and between the first upright (10) and the second upright ( 11), the rib (12) and an additional rib (13) arranged in longitudinal series and joined in at least one junction portion (26).
9. Dispositif de chauffage électrique (1) comprenant un cadre (3) défini selon l’une quelconque des revendications précédentes, au moins un élément chauffant (2) logé dans le logement (4) du cadre (3). 9. Electric heating device (1) comprising a frame (3) defined according to any one of the preceding claims, at least one heating element (2) housed in the housing (4) of the frame (3).
10. Boîtier d’installation de ventilation, de chauffage et/ou de climatisation pour véhicule comprenant un dispositif de chauffage électrique (1) selon la revendication précédente. 10. Housing for ventilation, heating and / or air conditioning installation for a vehicle comprising an electric heating device (1) according to the preceding claim.
PCT/FR2019/051604 2018-07-13 2019-06-28 Bevel-ribbed electrical airflow heating device for a vehicle WO2020012086A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1856525A FR3083745B1 (en) 2018-07-13 2018-07-13 ELECTRIC HEATING DEVICE FOR AIRFLOW WITH BEVELLED RIB FOR VEHICLE
FR1856525 2018-07-13

Publications (1)

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WO2020012086A1 true WO2020012086A1 (en) 2020-01-16

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Application Number Title Priority Date Filing Date
PCT/FR2019/051604 WO2020012086A1 (en) 2018-07-13 2019-06-28 Bevel-ribbed electrical airflow heating device for a vehicle

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FR (1) FR3083745B1 (en)
WO (1) WO2020012086A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076834A2 (en) * 2009-12-23 2011-06-30 Valeo Systemes Thermiques Electric heating device and corresponding heating appliance
FR3056455A1 (en) * 2016-09-29 2018-03-30 Valeo Systemes Thermiques FRAME FOR AN ELECTRIC HEATING DEVICE COMPRISING A PLASTIC DEFORMATION MEANS
FR3056454A1 (en) * 2016-09-29 2018-03-30 Valeo Systemes Thermiques FRAME FOR AN ELECTRIC HEATING DEVICE COMPRISING A PLASTIC DEFORMATION MEANS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076834A2 (en) * 2009-12-23 2011-06-30 Valeo Systemes Thermiques Electric heating device and corresponding heating appliance
FR3056455A1 (en) * 2016-09-29 2018-03-30 Valeo Systemes Thermiques FRAME FOR AN ELECTRIC HEATING DEVICE COMPRISING A PLASTIC DEFORMATION MEANS
FR3056454A1 (en) * 2016-09-29 2018-03-30 Valeo Systemes Thermiques FRAME FOR AN ELECTRIC HEATING DEVICE COMPRISING A PLASTIC DEFORMATION MEANS

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FR3083745B1 (en) 2020-11-27

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