CN214205876U

CN214205876U - Heating unit of electric heating device and heating device

Info

Publication number: CN214205876U
Application number: CN202022160430.3U
Authority: CN
Inventors: E.戈莫斯; Y.库亚佩尔; J.莱弗洛克
Original assignee: Valeo Systemes Thermiques SAS
Current assignee: Valeo Systemes Thermiques SAS
Priority date: 2019-09-26
Filing date: 2020-09-27
Publication date: 2021-09-14
Anticipated expiration: 2030-09-27
Also published as: FR3101401B1; FR3101401A1

Abstract

The present invention relates to a heating unit (2) of a heating device (1) for heating a passing air flow, comprising a frame (6) and a heat sink (8), said frame (6) being configured to incorporate at least one heating element (10), said frame comprising an inlet face (24) and an outlet face (26) for the air flow passing through the heating unit (2), said heat sink (8) being arranged against said inlet face (24), the heating unit being characterized in that at least one deflector (44) is on said inlet face (24) of the frame and close to said heat sink (8) forming a protrusion of the frame (6).

Description

Heating unit of electric heating device and heating device

Technical Field

The utility model discloses a field is motor vehicle heating field. It relates to an electric heating device for installation in a ventilation, heating and/or air-conditioning installation of a motor vehicle.

More specifically, the present invention relates to an electric heating device having a heating element, that is to say a resistive heating element, for example a Positive Temperature Coefficient (PTC) resistor, for dissipating heat under the action of an electric potential, which makes it possible to generate heat rapidly in a vehicle by a given supply of electric power.

Background

It is known to heat an air flow, in particular an air flow passing through the ducts of a ventilation, heating and/or air-conditioning installation of a motor vehicle, by means of such an electric heating device. In this case, the electric heating device or electric radiator comprises at least one electronic interface casing and a heating unit constituted by at least one perforated frame configured to carry heating elements such that they are in contact with the air passing through the frame. The heating unit further comprises a heat sink positioned on one of the perforated faces of the frame and making it possible to discharge the thermal energy released when the electronic components, which are necessary for the operation of the heating element, are activated.

Such heating devices are usually inserted into, for example, a heating installation by means of a linear translational movement starting with a heating unit, so that the electrical interface housing abuts against one face of the heating installation, so that it can be fastened, for example, by means of a screw connection. A heat sink arranged against one of the perforated faces of the heating unit may then prevent the insertion of the heating device with a linear translational movement.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is therefore to remedy the above-mentioned drawbacks by proposing a simple device for guiding the insertion of a heating device into a heating installation, so that the heat sink does not prevent such insertion.

The invention belongs to this case, the subject of which is a heating unit of an electric heating device, which heating unit extends in a longitudinal main direction of extension and comprises at least one frame and one heat sink, the frame comprising a first longitudinal end and a second longitudinal end opposite to each other in the longitudinal direction of the heating unit, the frame further comprising a perforated inlet face and a perforated outlet face, the perforated inlet face and the perforated outlet face allowing an air flow through the heating unit and being located on mutually opposite sides in a vertical direction parallel to the air flow direction, the inlet face defining a frame plane, the heat sink being arranged against said inlet face at the first longitudinal end of the frame, the heating unit being characterized in that it comprises at least one deflector forming a projection of the frame between the heat sink and the second longitudinal end of the frame, the deflector comprising at least one inclined wall inclined with respect to the frame plane, the inclined walls are oriented such that the vertical dimension of the deflector increases as one approaches the heat sink.

The electric heating device may be, for example, a radiator, so as to be able to heat the interior of the motor vehicle, the heating unit forming a part of the electric heating device in which heat exchange takes place to heat an air flow passing through the inlet and outlet faces of the heating unit and able to be fed into the vehicle interior.

The heat sink, which is arranged against the inlet face of the frame, makes it possible to discharge the thermal energy released by the electronic components for generating the control and power supply of the electric heating device. The heat sink is thus offset in the vertical direction of the heating unit with respect to the frame plane defined by the inlet face of said frame by its upper face plane defined by its outer face.

A deflector in the form of a ramp such that its thickness increases towards the heat sink makes it easier to insert the heating device into the heating installation, for example by guiding a portion of the heating installation by means of its inclined walls on the path of an upper face plane outside said upper face plane.

According to a feature of the invention, the heat sink comprises an inner face close to the inlet face and an outer face distant from the inlet face in a vertical direction of the heating unit, the outer face defining an upper face plane, and the deflector extends at least to the upper face plane of the heat sink. This feature allows the deflector to direct the outer portion of the electrical heating device out of the plane of the upper face of the heat sink.

According to a feature of the invention, the frame comprises a first side wall and a second side wall, which mainly extend in the longitudinal direction of the heating unit and laterally delimit the inlet face and the outlet face, said at least one deflector forming a protrusion of the frame from one and/or the other of the first side wall and the second side wall.

According to a feature of the invention, the frame comprises at least one longitudinal rod extending through the inlet face of the frame in the longitudinal direction of the heating unit, the deflector forming a protrusion of the frame from said longitudinal rod.

According to a feature of the invention, the inclined wall of the deflector forms an angle in the range of 30 ° to 60 ° with respect to the plane of the frame. This range of tilt angles allows the tilt wall to have a guiding function while using a smaller amount of material. According to a preferred embodiment of the invention, the inclined wall is at an angle of inclination of 45 ° relative to the plane of the frame.

According to one feature of the invention, the heat sink comprises a first and a second lateral boundary, the first and the second lateral boundary being on opposite sides to each other in the longitudinal direction of the heating unit and extending in a lateral direction perpendicular to the longitudinal direction and the vertical direction of the heating unit, the first lateral boundary extending at a first longitudinal end of the frame, the second lateral boundary extending near the deflector.

According to a feature of the invention, the second lateral boundary of the heat sink comprises at least one chamfer.

The chamfered portion arranged on the second lateral boundary forms a beveled corner (levelled corner) of the second lateral boundary of the heat sink, which together with the beveled wall of the deflector helps to guide a part of the heating installation out of the plane of the upper face of the heat sink. In other words, the inclined wall of the deflector defines an inclined plane and the chamfer defines a chamfer plane inclined with respect to the frame plane and the upper face plane. In a preferred embodiment of the invention, the inclined plane and the chamfer plane coincide.

According to a feature of the invention, the deflector comprises a reinforcement wall extending perpendicular to the plane of the frame between the frame and the free end of the inclined wall, the reinforcement wall being at a first distance from the second transverse boundary of the heat sink, the first distance being less than 2 cm.

The function of the stiffening wall is to support the inclined wall of the deflector, in particular during installation of the heating device in a heating installation. It will thus be appreciated that said inclined wall extends at said first distance of less than 2cm with respect to the second transverse boundary, so that the inclined wall fulfils its guiding function. The first distance is measured between the reinforcement wall and the second lateral boundary of the heat sink along a line parallel to the main extension direction of the heating unit.

According to a feature of the invention, the deflector extends vertically beyond the upper face plane of the heat sink outer face and has a tongue that extends the top of the deflector in such a way that the tongue is close to the heat sink outer face.

The tongue extends from the free end of the deflector substantially parallel to the upper face plane of the heat sink. The tongue enables an enhanced guidance of the outer part of the heating device outside the upper face plane of the heat sink by extending the slanted wall out of the upper face plane.

The present invention also covers a heating device comprising at least one electronic interface housing and a heating unit according to the above features, the heating unit having at least one heating element housed in the frame between the inlet face and the outlet face, the electronic interface housing being configured to house electronic control components for controlling the at least one heating element.

According to one feature of the invention, the first lateral boundary of the heat sink includes means for securing to the electronic interface housing. The securing means may be, for example, a tab that extends into the electronic interface housing and is secured to the electronic interface housing by a threaded connection or an adhesive.

Drawings

Other features, details and advantages of the invention will become more apparent from a reading of the following description, given by way of illustration, with reference to the accompanying drawings, in which:

fig. 1 is an overall perspective view of an electrical heating device according to the invention, showing in particular an electronic interface housing and a heating unit according to a first embodiment, and comprising a frame able to house a heating element, a heat sink and at least one deflector;

FIG. 2 shows a front view of a variant of the first embodiment of the heating unit of FIG. 1;

FIG. 3 is a cross-sectional view of the heating unit of FIG. 2 taken along a first longitudinal axis A;

fig. 4 is a longitudinal sectional view of a heating unit according to a second embodiment, showing a heat sink having chamfered portions;

figure 5 is a schematic view of one face of a heating unit according to a third embodiment of the invention;

fig. 6 is a cross-sectional view of the heating unit of fig. 5 along a second longitudinal axis B, showing the specific shape of the deflector of the heating unit according to a third embodiment.

Detailed Description

It should be noted at the outset that the attached drawings illustrate the invention in a detailed manner in order to carry out the invention, and of course, if necessary, they can be used to better define the invention.

Referring first to fig. 1, a heating device 1 can be seen, which heating device 1 is configured to be incorporated within the housing of a heating, ventilation and/or air conditioning installation and comprises a heating unit 2 according to one aspect of the invention, and an electrical interface housing 4.

According to one aspect of the invention, the heating unit 2 extends in a longitudinal main direction of extension L and comprises a frame 6, a heat sink 8 and at least one heating element 10. According to the present invention, and as will be described in greater detail below, the heating unit has at least one deflector 44, the deflector 44 forming a projection of the frame 6, so as to make it easier to insert the heating device into a suitable enclosure of the housing of the heating, ventilation and/or air conditioning installation.

In this case, the frame 6 is made in a single piece in the shape of a rectangular parallelepiped and comprises a first longitudinal end 12 and a second longitudinal end 14, the second longitudinal end 14 being at the opposite end to the first longitudinal end 12 in the longitudinal direction L of the heating unit 2. The electrical interface housing 4 is arranged at a first longitudinal end 12 of the frame 6 and contains all electrical components for controlling the operation of the heating device 1, more specifically the heating element(s) 10 of the heating unit 2, and for supplying electrical power to said heating device. The electrical interface housing 4 further comprises at least one fastening tab 16 for securing the heating device 1 in a heating installation.

The end wall 18 extends at the second longitudinal end 14 of the frame 6, mainly in the transverse direction T of the heating unit 2, perpendicular to the main extension direction of said heating unit 2. At each lateral end of the end wall 18, a first side wall 20 and a second side wall 22, respectively, extend perpendicular to the end wall 18 in the longitudinal direction of the heating unit 2. The assembly formed by the end wall 18, the first side wall 20 and the second side wall 22 is U-shaped, wherein the end wall 18 forms the base of the U and the electrical interface housing 4 closes the opening of the U during installation of the heating device 1.

The frame 6 has perforated faces, more specifically an inlet face 24 and an outlet face 26, which extend mainly in the longitudinal direction L of the heating unit 2 and on opposite sides to each other in a vertical direction V perpendicular to the longitudinal direction L and the transverse direction T of the heating unit 2. Thus, the frame plane C corresponding to the longitudinal and transversal plane defined by the inlet face 24 of said frame 6 is differentiated. The inlet face 24 and the outlet face 26 are perforated to allow the air flow to pass through the heating unit 2 in an air flow direction corresponding to a direction F parallel to the vertical direction V of the heating unit 2. It should be noted that the separation between the inlet face and the outlet face corresponds to the circulation direction F of the air flow through the heating body, which enters the heating body in order to exchange thermal energy with the heating element(s) through the inlet face 24 and is discharged from the heating element as a hot air flow through the outlet face 26.

The frame 6 has a plurality of longitudinal bars 28, the longitudinal bars 28 extending parallel to the first and

second side walls

20, 22 from the first longitudinal end 12 to the second longitudinal end 14 of the frame 6 through the inlet and

outlet faces

24, 26. The longitudinal bars 28 are arranged in a mutually parallel manner, forming a series in the transverse direction T of the heating unit 2, and they contribute to stiffening the frame 6 of said heating unit 2.

The end wall 18, the first side wall 20, the second side wall 22, and the plurality of longitudinal bars 28 help to form at least one enclosure 30 in which the at least one heating element 10, as described above, is located. The at least one heating element 10 extends in the longitudinal direction L of the heating unit 2 and has resistive elements which are supplied with electricity so that they heat up and thus heat the air flow passing through the heating device 1 in the direction F. Each resistive element has means for coupling to the electronic interface housing 4, so as to be electrically connectable to the electrical network of the vehicle via the electronic interface housing 4.

It will be appreciated that the features already described for one heating element 10 apply to each heating element 10 that can be accommodated in the frame 6 of the heating unit 2. Thus, as can be seen in particular in fig. 2, the heating unit 2 comprises a plurality of heating elements 10 arranged alongside one another in the transverse direction T of the heating unit 2.

The heat sink 8 of the heating unit 2 extends partly through the frame and partly inside the electrical interface housing where it is in contact with the heat-releasing electronic components, in particular high-power components.

The heat sink 8 (in its part arranged through the frame) is arranged against an inlet face 24 of the frame 6 at the first longitudinal end 12 of the frame 6 and has a perforated profile in order to be able to be passed through by air and to discharge thermal energy released by the electronic components for generating the control and power supply to the at least one heating element 10. An inner face 32 and an outer face 34 of the heat sink 8, the inner face 32 being defined thereby close to the inlet surface 24 of the frame 6, and the outer face 34 corresponding to the face of the heat sink 8 opposite the inner face 32 in the vertical direction V of the heating unit 2. The outer faces 34 thus define an upper face plane D which is parallel to the frame plane C and which is offset in the vertical direction V of the heating unit 2 with respect to the frame plane C by at least the thickness of the heat sink, that is to say the vertical dimension of the heat sink.

As can be seen in particular in fig. 2, the heat sink 8 further comprises a first lateral boundary 36 and a second lateral boundary 38, which extend in the lateral direction T of the heating unit 2 and on opposite sides to each other in the longitudinal direction L of said heating unit 2. Thus, the first lateral boundary 36 is a boundary of the heat sink 8 extending at the first longitudinal end 12 of the frame 6 and includes a securing means (not visible) for securing the heat sink 8 to the electronic interface housing 4. The part of the heat sink which is accommodated in the electronic interface housing and which is in contact with the electronic component (in particular the power electronic component) as described above is arranged inside the housing in the continuation of this first lateral boundary.

The heat sink 8 further comprises a first longitudinal boundary 40 and a second longitudinal boundary 42, which extend in the longitudinal direction L of the heating unit 2, connecting the first transverse boundary 36 and the second transverse boundary 38. According to the present invention, as can be seen in particular in fig. 2, the first longitudinal boundary 40 and the second longitudinal boundary 42 laterally delimit the heat sink 8 and extend close to the first side wall 20 and the second side wall 22, respectively, of the frame 6.

The mounting of the heating device 1 in the heating installation of the motor vehicle is achieved by a rectilinear translational movement parallel to the longitudinal direction L of the heating unit 2, the heating device being inserted from the second longitudinal end 14 of the frame 6 to the first longitudinal end 12 of the frame 6, so that the fastening tabs 16 of the electrical interface housing 4 are close to complementary fastening means (not visible) provided on the heating installation.

As described in detail above, the present invention provides at least one deflector 44, the deflector 44 protruding from the frame 6 between the heat sink 8 and the second longitudinal end 14 of said frame 6.

The deflector or deflectors are configured such that the position of the heating device 1 can be adjusted during insertion of the heating device 1 into the housing of the installation, thereby preventing elements of the housing, such as the edges delimiting the opening into which the heating device is inserted, from coming into contact with the heat sink, in particular with the second lateral boundary 38 of the heat sink, and forming a stop for the insertion of the heating device 1 into the housing.

The deflector 44 is arranged beside the heat sink 8 and is in the form of a ramp so that the relative position of the elements of the housing with respect to the heat sink can be guided. The ramp is particularly configured so that this element of the housing does not meet the heat sink 8 during insertion of the electrical heat spreader into the housing and is located at a distance from the frame above the plane of the upper face D.

As can be seen in fig. 1, the frame 6 may comprise two deflectors 44, each of which forms a protrusion of the first 20 and second 22 side walls between the heat sink 8 and the second longitudinal end 14 of the frame 6, advantageously as close as possible to the second lateral boundary 38 of the heat sink. According to an alternative of the invention, visible in fig. 2, the deflector 44 may be arranged in a more central position than the lateral position of the deflector projecting from the side wall, such deflector then projecting from one of the longitudinal bars 28 of the frame 6. Here, too, the deflector is arranged between the heat sink 8 and the second longitudinal end 14 of the frame 6, advantageously as close as possible to the second lateral boundary 38 of the heat sink.

Referring now to fig. 3-6, the deflector 44 and heat sink 8 will be described in greater detail in the remaining detailed description, fig. 3-6 showing exemplary embodiments of the deflector 44 associated with a heating unit according to one aspect of the present invention.

Fig. 3 shows a schematic cross-sectional view of the heating unit 2 on the sectional plane a-a visible in fig. 2 and through one of the deflectors, in this case the deflector being arranged in the centre of the frame, it being understood that the following is similar for the laterally arranged deflector.

The deflector 44 forms a projection of the inlet face 24 of the frame 6, in this case at one of the longitudinal bars 28, as described above, with a ramp shape. In other words, the deflector 44 emerges from a frame plane C defined by the inlet face 24 and has a height or vertical dimension perpendicular to this frame plane C, which varies in the longitudinal direction of the heating unit. The deflector 44 is configured such that it has a top portion disposed at least at the upper face plane D defined by the exterior face 34 of the heat sink 8, thereby preventing contact between elements of the heating facility and the second lateral boundary 38 of the heat sink 8.

More specifically, the deflector 44 comprises an inclined wall 46 and a reinforcing wall 48, which meet each other, forming at the free end a top 50 of the deflector 44, the top 50 being arranged in the upper face plane d

The inclined wall 46 extends from the frame plane C at an inclination angle a of 30 ° to 60 °, which range allows the inclined wall 46 to act as a guiding ramp during insertion of the heating device 1 into the housing of the heating installation, with a good compromise between the insertion force, which should not be adversely affected by excessive inclination, and the dimensions of the ramp along the frame. According to a preferred embodiment, the angle of inclination α of the inclined wall 46 with respect to the frame plane C is 45 °.

The inclination of the inclined walls is such that the vertical dimension of the deflector 44 increases with increasing proximity to the heat sink 8, the top portion 50 of the deflector forming the portion of the deflector closest to the heat sink.

The reinforcing wall 48 extends perpendicularly to the frame, in this case to the longitudinal bars 28, between the top 50 of the deflector 44 and the frame 6. Thus, the reinforcement wall 48 is arranged adjacent to the second lateral boundary 38 of the heat sink 8 and at a first distance D1 from the second lateral boundary 38, the first distance D1 being measured between the reinforcement wall 48 and the second lateral boundary 38 along a straight line parallel to the longitudinal direction L of the heating unit 2. The first distance D1 is a compromise between: on the one hand, it is desirable to position the deflector 44 as close as possible to the heat sink 8, to avoid the situation that elements of the housing of the installation that slide along the ramp during insertion may be accommodated between the ramp and the heat sink; on the other hand, longitudinal clearance is provided during assembly of the heat sink to the frame so that the deflector does not prevent the interior face 32 of the heat sink from pressing against the inlet surface 24 of the frame. The first distance D1 is advantageously less than 2 cm.

Fig. 4 shows a second embodiment of the invention, in which the second lateral boundary 38 of the heat sink 8 comprises a chamfered portion 52, and in which the height of the slope differs from the above-mentioned height. It should be understood that in the rest of the description, only features different from the first embodiment will be explained, and for common features reference should be made to fig. 1 to 3.

A chamfered portion 52 is formed between the second lateral boundary 38 and the exterior surface 34 over all or a portion of the lateral dimension of the heat sink. More specifically, the chamfer extends between a first edge corner 521 at the junction with the second lateral boundary 38 and a second edge corner 522 at the junction with the exterior face 34.

The first height H1 is defined as the distance between the free end of the top 50 forming the deflector 44 and the inlet face 24 of the frame 6, measured along a line parallel to the vertical direction V of the heating unit 2. Similarly, the second height H2 is defined as the distance between the exterior face 34 of the heat sink 8 and the entrance surface 24 of the frame 6, measured along a straight line parallel to the vertical direction V of the heating unit 2. In a second embodiment of the invention, the first height H1 is strictly less than the second height H2, so that the top 50 of the deflector 44 is arranged between the frame plane C and the upper face plane D

The inclined wall 46 of the deflector 44 defines an inclined plane I which, as mentioned above, is at an inclined angle α to the frame plane C. In the same way, the chamfer 52 provided between the second lateral boundary 38 and the exterior face 34 of the heat sink 8 defines a chamfer plane F that is substantially parallel to the inclined plane I of the inclined wall 46 of the deflector 44. According to the example shown in fig. 4, the inclined plane I and the chamfer plane F are coincident, it being understood that they may have different inclinations, the inclination of each of these planes being advantageously in the range 30 ° to 60 °, as described above.

The chamfered portion 52 provided on the second lateral boundary 38 of the heatsink 8 enables the extension of the inclined wall 46 of the deflector 44. More specifically, the first height H1 of the deflector 44 is changed such that the top 50 of the deflector lies substantially in the same longitudinal and transverse planes as the first edge corner 521 of the chamfered portion 52, that is, in a plane parallel to the frame plane C.

This second embodiment has the advantage of reducing the amount of material required to manufacture the deflector 44 by acting on the part of the guide ramp that is given to the second lateral boundary 38 of the deflector 44, and of providing a more robust deflector 44, the free end of which is closer to the frame plane C.

A third embodiment will now be described with reference to fig. 5 and 6, fig. 5 showing a schematic front view of the heating unit 2, and fig. 6 showing a view on section B-B visible in fig. 5. In the following description, only the features different from the previous two embodiments will be described, and for the common features, reference should be made to fig. 1 to 4.

In this third embodiment, the above-mentioned first height H1 is strictly greater than the second height H2, and it will therefore be appreciated that the free end of the top portion 50 forming the deflector 44 extends a distance from the inlet face, above the upper face plane D, in the vertical direction of the heating unit 2.

In this third embodiment, the deflector 44 has a tongue 54, the tongue 54 extending the top 50 of the deflector 44 in the longitudinal direction L of the heating unit 2, that is to say perpendicular to the reinforcing wall 48 of said deflector 44, and towards the first longitudinal end 12 of the frame 6. In other words, the tongue 54 extends parallel to the exterior face 34 of the heat sink 8 and such that the tongue 54 partially covers the exterior face 34 of the heat sink 8.

According to what has been described, the reinforcing wall 48 of the deflector 44 and the second lateral boundary 38 of the heat sink 8 are spaced apart by a first distance D1, forming a space 56 between each other. During insertion of the heating device 1 into the heating installation according to the above-described features, a small part belonging to the heating installation can then be accommodated in the space 56 between the reinforcing wall 48 of the deflector 44 and the second lateral boundary 38, preventing the heating device 1 from being fully inserted into the heating installation.

The tongue 54 is made of a semi-rigid material, that is to say has a low level of deformation, and has the function of remedying the above-mentioned drawbacks by preventing the parts from being housed in the space 56 formed between the reinforcing wall 48 and the second transverse boundary 38. Thus, the tongue 54 extends towards the first longitudinal end 12 of the frame 6 at least until it is proximate to the exterior face 34 of the heat sink 8.

As shown in fig. 5, the tongue 54 may be provided on one of the deflectors 44 located on one of the longitudinal bars 28, but it will be appreciated that it may also be provided on a deflector 44 protruding from one of the

side walls

20, 22 of the frame 6.

The present invention therefore proposes a simple and inexpensive device which makes it easier to install a heating device in a heating installation by providing a protruding deflector on the frame of the heating unit.

The invention is not, however, limited to the devices and arrangements described and illustrated herein, but extends also to all equivalent devices or arrangements and any technical-functional combinations of these devices.

Claims

1. A heating unit (2) of an electric heating device (1), extending in a longitudinal main direction of extension (L), and comprising at least one frame (6) and one heat sink (8), the frame (6) comprising a first longitudinal end (12) and a second longitudinal end (14) at mutually opposite ends in the longitudinal main direction of extension (L) of the heating unit (2), the frame (6) further comprising a perforated inlet face (24) and a perforated outlet face (26), the inlet face (24) and the outlet face (26) allowing an air flow through the heating unit (2) and being on mutually opposite sides in a vertical direction (V) parallel to the flow direction of the air flow, the inlet face (24) defining a frame plane (C), the heat sink (8) being arranged against the inlet face (24) at the first longitudinal end (12) of the frame (6), characterized in that the heating unit comprises at least one deflector (44) forming a protrusion of the frame (6) between the heat sink (8) and the second longitudinal end (14) of the frame (6), the deflector (44) comprising at least one inclined wall (46) inclined with respect to the frame plane (C), the inclined wall being oriented such that the vertical dimension of the deflector (44) increases as one approaches the heat sink (8).

2. A heating unit (2) according to claim 1, wherein the heat sink (8) comprises an inner face (32) close to an inlet face (24) and an outer face (34) remote from the inlet face (24) in a vertical direction (V) of the heating unit (2), the outer face (34) defining an upper face plane (D), and wherein the deflector (44) extends at least to the upper face plane (D) of the heat sink (8).

3. Heating unit (2) according to claim 1 or 2, characterized in that the frame (6) comprises a first side wall (20) and a second side wall (22), the first side wall (20) and the second side wall (22) extending in a longitudinal main direction of extension (L) of the heating unit (2) and laterally delimiting the inlet face (24) and the outlet face (26), the at least one deflector (44) forming a protrusion of the frame from one and/or the other of the first side wall (20) and the second side wall (22).

4. Heating unit (2) according to claim 1 or 2, characterized in that the frame (6) comprises at least one longitudinal bar (28) extending through the inlet face (24) of the frame (6) in a longitudinal main direction of extension (L) of the heating unit (2), the deflector (44) forming a projection of the frame from the longitudinal bar (28).

5. Heating unit (2) according to claim 1 or 2, characterized in that the inclined wall (46) of the deflector (44) forms an angle of 30 ° to 60 ° with respect to the frame plane (C).

6. The heating unit (2) according to claim 1 or 2, characterized in that the heat sink (8) comprises a first lateral boundary (36) and a second lateral boundary (38), the first lateral boundary (36) and the second lateral boundary (38) extending on opposite sides to each other in a longitudinal main extension direction of the heating unit (2) and in a lateral direction (T) perpendicular to the longitudinal main extension direction (L) and a vertical direction (V) of the heating unit (2), the first lateral boundary (36) extending at a first longitudinal end (12) of the frame (6), the second lateral boundary (38) extending next to the deflector.

7. A heating unit (2) according to claim 6, characterized in that the second lateral boundary (38) of the heat sink comprises at least one chamfered portion (52).

8. The heating unit (2) according to claim 6, characterized in that the deflector (44) comprises a reinforcement wall (48), the reinforcement wall (48) extending perpendicular to the frame plane (C) between the frame (6) and a top (50) of the deflector (44), the reinforcement wall (48) being at a first distance (D1) from a second lateral boundary (38) of the heat sink (8), the first distance (D1) being smaller than 2 cm.

9. The heating unit (2) according to claim 2, characterized in that the deflector (44) extends vertically beyond the upper face plane (D) of the exterior face (34) of the heat sink (8) and has a tongue (54), the tongue (54) extending the top (50) of the deflector (44) in such a way that it is close to the exterior face (34) of the heat sink (8).

10. Heating device (1), characterized in that it comprises at least one electronic interface housing (4) and a heating unit (2) according to any one of claims 1 to 9, said heating unit (2) having at least one heating element (10), said heating element (10) being housed in said frame (6) between said inlet face (24) and said outlet face (26), and said electronic interface housing (4) being configured to house electronic control means for controlling said at least one heating element (10).