阅读说明：本技术 用于固定车载储箱中所含的水溶液的分配模块的固定设备 (Fixing device for fixing a dispensing module of an aqueous solution contained in an on-board tank ) 是由 弗朗克·道希 斯蒂芬·伦纳德 洛朗·迪埃 西蒙·亚诺 弗兰克·勒克里瓦因 忆恩·赛诺特 于 2020-06-01 设计创作，主要内容包括：本发明涉及一种用于固定车载储箱中所含的水溶液的分配模块的固定设备(1)。根据本发明,这样的固定设备(1)包括泵定子(31)、加热装置和散热器(14),所述散热器(14)包括基部(15)和限定至少一个第一内部体积(3、17)的第一组大致垂直于所述基部(15)的壁(16),所述基部(15)和/或至少一个大致垂直于所述基部(15)的壁包括所述泵定子的至少一个定位装置(18)和/或所述泵定子的第一固定装置(19)和/或所述加热装置的至少一个第二固定装置(20),泵定子(31)和散热器(14)的组件用塑料包覆模制,所述固定设备(1)包括适于排走由泵泵送的水溶液的至少一个第一贯穿孔(21)和适于为所述泵供给所述水溶液的第二贯穿孔(22),所述至少一个第一贯穿孔优选地位于所述固定设备(1)的基部处。(The invention relates to a fixing device (1) for fixing a dispensing module of an aqueous solution contained in an on-board tank. According to the invention, such a fixing device (1) comprises a pump stator (31), heating means and a heat sink (14), said heat sink (14) comprising a base (15) and a first set of walls (16) substantially perpendicular to said base (15) defining at least one first internal volume (3, 17), said base (15) and/or at least one wall substantially perpendicular to said base (15) comprising at least one positioning means (18) of said pump stator and/or a first fixing means (19) of said pump stator and/or at least one second fixing means (20) of said heating means, the assembly of pump stator (31) and heat sink (14) being overmoulded with plastic, said fixing device (1) comprising at least one first through hole (21) adapted to drain an aqueous solution pumped by the pump and a second through hole (22) adapted to feed said pump with said aqueous solution, the at least one first through going hole is preferably located at the base of the fixation device (1).)

1. Fixing device (1) for fixing a dispensing module of an aqueous solution contained in an on-board tank, said fixing device (1) comprising a pump stator (31), heating means and a radiator (14), said radiator (14) comprising a base (15) and a first set of walls (16) substantially perpendicular to said base (15) defining at least one first internal volume (3, 17), said base (15) and/or at least one wall perpendicular to said base (15) comprising at least one positioning means (18) of said pump stator and/or a first fixing means (19) of said pump stator and/or at least one second fixing means (20) of said heating means, the assembly of pump stator (31) and radiator (14) being overmoulded with plastic, said fixing device (1) comprising at least one first through perforation (21) suitable for draining the aqueous solution pumped by said pump and a second through perforation suitable for feeding said pump with said aqueous solution A second through hole (22), said at least one first through hole being preferably located at the base of the fixation device (1).

2. Fixing device (1) of a dispensing module for fixing an aqueous solution contained in an on-board tank according to claim 1, wherein said heating means are chosen from a heating resistor, a heating element of the PTC (positive temperature coefficient) type and a heat-carrying fluid circulation circuit, preferably a heating element of the PTC (positive temperature coefficient) type.

3. Fixing device (1) for a dispensing module of an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein the second fixing means (20) of the heating means are receptacles present in at least one wall of the radiator (14) substantially perpendicular to the base (15), said receptacles not being in contact with the aqueous solution.

4. Fixing device (1) for a dispensing module of an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein a second set of walls (29) substantially perpendicular to the base (15) defines a second internal volume (30), said second internal volume (30) being embedded in said first internal volume (3, 17), said second internal volume (30) acting as a housing for said pump stator (31).

5. Fixing device for a dispensing module of an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein said first set of substantially vertical walls (16) comprises at least one housing suitable for receiving a connector for a jet pump.

6. Fixing device (1) for a dispensing module of an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein said first set of substantially vertical walls (16) and/or said base (15) of the radiator comprises at least one overmolded fourth through hole (24).

7. Fixing device (1) of a dispensing module for fixing an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein it comprises fixing means (2) for fixing to the tank, said fixing means (2) being selected from a welding flange, a cam adapter, a Meisen tank, a mechanical assembly with sealing gasket, the fixing means for fixing to the tank preferably being a welding flange.

8. Fixing device for a dispensing module of an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein the first group comprising a base (15) and a first set of the radiators (14) substantially perpendicular to the wall (16) of the base (15), the first fixing means (19) of the pump stator and the second fixing means (20) of the heating means defining at least one first internal volume (17) are a monolithic part.

9. Fixing device (1) for a dispensing module of an aqueous solution contained in a vehicle tank according to any one of the preceding claims, wherein the radiator (14) comprising a base (15) and a first set of walls (16) substantially perpendicular to the base (15) defining at least one first internal volume (17) is based on aluminium, preferably made of anodised aluminium.

10. A module for dispensing an aqueous solution contained in an on-board tank, the module comprising a fixing device (1) according to any one of the preceding claims, the module comprising a pump rotor inserted inside the pump stator.

11. An aqueous solution tank comprising the module of claim 10.

12. Method for manufacturing a fixing device (1) for fixing a dispensing module of an aqueous solution contained in an on-board tank, comprising at least the following steps:

-manufacturing a heat sink (14), said heat sink (14) comprising a base (15) and a first set of walls (16) substantially perpendicular to said base defining at least one first internal volume (17);

-arranging a pump stator (31) within the first internal volume (17);

-overmoulding, preferably with plastic, an assembly of a pump stator (31) and a radiator (14) comprising a base (15) and a first set of walls (16) substantially perpendicular to the base (15) defining at least one first internal volume (17).

Technical Field

The present invention relates to a fixing device for a distribution module for aqueous solution contained in an on-board tank, a distribution module for aqueous solution contained in an on-board tank comprising said fixing device and an on-board aqueous solution tank comprising said module. More specifically, the present invention relates to a method for manufacturing a fixing device for fixing a dispensing module of an aqueous solution contained in an on-board tank.

The invention can be used in particular in the field of decontamination of motor vehicle exhaust gases requiring the use of urea solutions, but also in the field of water injection into the intake circuit of vehicle engines. In the case of water injection, this water is mixed with the intake air to allow lowering the combustion temperature and reducing the emissions of pollutants known as NOx, and to improve the performance, for example of gasoline engines by reducing the sensitivity to knocking.

Background

The urea solution starts to freeze when the temperature drops below-11 c (below 0 c for water). For this purpose, the aqueous solution storage system for a motor vehicle comprises, in the tank, heating means arranged to avoid the urea solution or water (preferably demineralized water) from freezing.

However, when the vehicle stops after a certain period of travel, these heating means are deactivated and when the vehicle stops outdoors under external conditions where the temperature may for example reach around-40 ℃ in severe winter, the urea solution or water (preferably demineralized water) contained in the tank starts to convert into ice, and this conversion may cause the urea solution or water (preferably demineralized water) to completely freeze within tens of minutes.

Therefore, inside the tank there must be heating means suitable for rapidly thawing the water or urea located in the vicinity of the aqueous solution dispensing module.

Patent application WO2008/138960 discloses a urea aqueous solution dispensing module comprising a flexible heating device. Fixing such a flexible heater inside the module is problematic, as is fixing said module to the tank, which can be damaged when installing the urea aqueous solution dispensing module inside the tank.

Document US9702287B2 discloses a fixing device for a distribution module of an aqueous urea solution contained in an on-board tank, comprising a non-flexible heating means constituted by a radiator comprising at least one heating element of the PTC (positive temperature coefficient) type. The inflexible heating device disclosed in document US9702287B2 is overmolded with HDPE plastic. The distribution module of the aqueous urea solution does not comprise all or part of the radiator element. A disadvantage of such modules is that a large number of seals are required between the various parts of the module and that additional heaters are required.

Disclosure of Invention

The object of the present invention is in particular to overcome these drawbacks of the prior art.

More specifically, in at least one embodiment, it is an object of the present invention to provide a fixing device for fixing a dispensing module of an aqueous solution contained in an on-board tank, which requires less accessories, said accessories comprising sealing means or heating means.

In at least one embodiment, the invention also aims to provide a module for dispensing an aqueous solution contained in an on-board tank and an aqueous solution tank for a motor vehicle.

In at least one embodiment, another object of the present invention is to implement a method for manufacturing a fixing device for fixing a dispensing module of an aqueous solution contained in an on-board tank.

According to a particular embodiment, the invention relates to a fixing device for fixing a dispensing module of an aqueous solution contained in an on-board tank.

According to the invention, such a fixing device comprises a pump stator, heating means and a heat sink comprising a base and a first set of walls substantially perpendicular to said base defining at least one first internal volume, said base and/or at least one wall substantially perpendicular to said base comprising at least one positioning means of said pump stator and/or a first fixing means of said pump stator and/or at least one second fixing means of said heating means, the assembly of pump stator and heat sink being overmolded with plastic, said fixing device comprising at least one first through hole adapted to drain away an aqueous solution pumped by the pump and a second through hole adapted to supply said pump with an aqueous solution, the at least one first through hole being preferably located at the base of said fixing device, more preferably at said heat sink.

The general principle of the invention is based on the idea of optimizing not only the dissipation of the heat emitted by the heating means, but also the dissipation of the heat emitted by the pump stator, and also allowing to reduce the number of sealing means, such as sealing gaskets.

The invention is therefore based on a completely new and inventive method for realising a fixing device of a dispensing module for fixing an aqueous solution contained in an on-board tank, consisting of an assembly overmoulded with plastic, the assembly comprising a pump stator and a radiator, the fixing device comprising at least one first through hole adapted to drain away the water pumped by the pump, the first through hole being preferably located at the base of the fixing device, the radiator comprising at least one first fixing means of the pump stator and/or at least one second fixing means of the heating means.

The expression "a first set of walls substantially perpendicular to the base defining at least one first internal volume" means that the base and the first set of walls substantially perpendicular to the base form a contour, the upper portion of which corresponds to such a plane passing by the largest number of upper edges of the substantially vertical walls of the first set of substantially vertical walls, which in combination with the base and the first set of substantially vertical walls defines a first internal volume. According to a variant, the upper edges of the set of walls substantially perpendicular to the base can be connected to each other, in whole or in part, by a cover. The first set of substantially vertical walls may be constituted by substantially vertical walls that are continuous with each other or by substantially vertical walls that are partially or completely discontinuous with each other (like for example walls provided with slits over a partial height or over the entire height thereof, said height being defined with respect to the base). In the case of a first group of substantially vertical walls having one or more discontinuities, the first internal volume is defined by all the substantially vertical walls constituting said first group, the space between the walls being replaced by a virtual wall, the first internal volume being further defined by the base and by the upper portion corresponding to such plane passing through the upper edge of the substantially vertical walls of the first group of substantially vertical walls in the greatest number.

The expression "aqueous solution" refers to an aqueous solution comprising urea or water (preferably demineralized water). The expression "demineralized water" means an aqueous solution having a conductivity of less than or equal to 100. mu.S/cm at 25 ℃, even less than or equal to 50. mu.S/cm at 25 ℃, preferably less than or equal to 5. mu.S/cm at 25 ℃.

The concept of "lower" or "upper" is defined relative to the final positioning of the fixture within the vehicle, with the ground as a reference. The lower edge of the element is closer to the ground than the upper edge of the same element or wall.

The "at least one substantially vertical wall comprising at least one positioning means of the pump stator and/or a first fixing means of the pump stator and/or at least one second fixing means of the heating means" may be one of the walls belonging to a first group of walls defining at least one first internal volume substantially perpendicular to the base, or different from this first group of substantially perpendicular walls. When the substantially vertical wall is different from the first set of substantially vertical walls, the substantially vertical wall may have the form of a pin (ergot) so as to be inserted into an area within the pump stator in which the pin may be received. Alternatively, when the substantially vertical wall is different from the first set of substantially vertical walls, the substantially vertical wall may have the form of an area adapted to receive a pin present on the pump stator.

Advantageously, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the heating means are chosen from heating resistors, heating elements of the PTC (positive temperature coefficient) type and circulation circuits of a heat-carrying fluid, preferably heating elements of the PTC (positive temperature coefficient) type.

The circulation circuit of the heat transfer fluid thus allows a high power to be brought by the "conditioning (r gul) fluid at the input temperature (typically up to 120 ℃). PTC allows integration of high power and allows to benefit from automatic regulation according to the temperature, aqueous solution and filling level of the module (to avoid the risk of overheating and damaging the components).

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that at least one element of the pump stator is in contact with the radiator.

Such an embodiment thus allows to recover the energy emitted by the heat generation of the pump and to use this energy for heating the aqueous solution.

The expression "at least one element of the pump stator is in contact with the heat sink" means that at least one element of the pump stator is in contact with the heat sink.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the pump stator, the heating means and the heat sink are overmolded with plastic, said heat sink comprising a base and a first set of walls substantially perpendicular to said base defining at least one first internal volume, said base and/or at least one substantially perpendicular wall comprising at least one first fixing means of the pump stator and/or at least one second fixing means of the heating means.

Such an embodiment thus allows, on the one hand, to limit the number of sealing and fixing zones and, on the other hand, to provide electrical connections for the stator and the heating device through the "dry zone".

The expression "dry region" means that no aqueous solution is present in said region.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the fixture comprises, on the outer part, a joint (embout) in fluid communication with a first through hole adapted to drain away the water pumped by the pump.

The presence of this head therefore allows to more conveniently fix the injection line of the aqueous urea solution in the case of a motor vehicle exhaust gas decontamination system, or of water in the case of a water injection in the combustion chamber of a motor vehicle thermal engine.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the second fixing means of the heating device are receptacles present in at least one wall of the heat sink substantially perpendicular to the base, which receptacles are not in contact with the aqueous solution.

The term "receptacle" means that the second fixing means of the heating device is adapted to receive the heating device. The receiving portion may be provided with a guide means allowing the heating means to be easily inserted. Such a guide device may be, for example, a chute system. The receiving portion may further include a locking means for preventing the heating means from being easily removed from the receiving portion. The receiving portion may be in the form of a pocket.

Thus, the heating device can be easily assembled before or after overmolding.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: a second set of walls substantially perpendicular to the base define a second interior volume that is embedded in the first interior volume, the second interior volume serving as a receptacle for a pump stator.

The expression "a second set of walls substantially perpendicular to the base defines a second internal volume" means that the base and the second set of walls substantially perpendicular to the base form a contour, the upper portion of which corresponds to such a plane passing by the greatest number of upper edges of the substantially perpendicular walls of the second set of substantially perpendicular walls, which in combination with the base and the second set of substantially perpendicular walls defines the second internal volume. The second set of substantially vertical walls may be constituted by substantially vertical walls that are continuous with each other or by substantially vertical walls that are partially or completely discontinuous with each other (like for example walls provided with slits over their local height or over their entire height, said height being defined with respect to the base). Preferably, the second set of substantially vertical walls is constituted by substantially vertical walls that are continuous with each other. In the case where the second set of substantially vertical walls has one or more discontinuities, the second internal volume is defined by all the substantially vertical walls constituting said second set, the interspace between the walls of the second set being replaced by a virtual wall, the second internal volume being further defined by a base and an upper portion corresponding to the plane passing through the upper edge of the substantially vertical wall of the second set of substantially vertical walls in the greatest number.

Such an embodiment thus allows for an optimized pumping and heating of the aqueous solution. In such an embodiment, a pump stator is forcibly inserted into the second internal volume, the pump stator being dimensioned such that its volume is substantially equal to the second internal volume.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that said first set of substantially vertical walls comprises at least one housing suitable for receiving a connector for a jet pump.

Thus, the jet pump allows filling of the first internal volume to ensure pumping of the aqueous solution.

The "dynamic dead volume" is reduced thanks to the use of substantially vertical walls and jet pumps. The expression "dynamic dead volume" refers to the volume of aqueous solution in the tank that is not "pumpable" under driving conditions (when there is movement of the liquid towards the eccentric region of the tank). The addition of a "bowl" or "trap" around the pump created by the presence of the first set of substantially vertical walls allows the dynamic dead volume to be reduced by retaining a portion of the aqueous solution in the "bowl" or "trap".

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that the first set of substantially vertical walls and/or the base of the radiator comprises at least one overmolded fourth through hole.

Thus, thanks to the mechanical anchoring of the plastic to the heat sink, a thermal contact between the heat sink and the plastic is ensured. The overmolded fourth through-going hole is only used for better mechanical adhesion between the plastic and the heat sink. When the overmoulding is completed with plastic and the fixing means of the dispensing module for fixing the aqueous solution contained in the vehicle tank are formed, the fourth through hole of the overmoulding is no longer evident.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is provided in such a way that it comprises fixing means for fixing to said tank, said fixing means being chosen from a welding flange (trottoird soudu), a cam adapter, a meisen can, a mechanical assembly with a sealing gasket, the fixing means for fixing to said tank preferably being a welding flange.

Welding by welding the flanges thus allows to reduce the number of parts and therefore the costs, and also allows to obtain a more compact system, the welding interface also being more compact than mechanical assembly.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the heat sink comprising a base and a first set of walls defining at least one first internal volume substantially perpendicular to the base, the first fixing means of the pump stator and the second fixing means of the heating means are a one-piece part.

Thus, the heat sink is made of a single piece, which reduces cost and simplifies positioning and retention in the overmolding mold.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the heat sink, which comprises a base and a first set of walls substantially perpendicular to the base defining at least one first internal volume, is based on aluminium, preferably made of anodised aluminium.

The expression "aluminum-based" means that the heat sink comprises at least 50% by weight of aluminum, preferably 75% by weight of aluminum, more preferably 90% by weight of aluminum.

Thus, the heat conductivity and the processing characteristics of the heat sink are optimized.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: a second through-going hole adapted to supply the pump with an aqueous solution is located in a first set of upper portions of the walls substantially perpendicular to said base defining at least one first internal volume. Preferably, the perimeter of the second through hole is constituted by a first set of upper edges substantially perpendicular to the walls of said base.

Thus, such an embodiment allows: spillage of the solution pumped by the jet pump during operation, expansion of the ice upon freezing, and direct filling of the first internal volume upon filling when the filling device is passed over the module.

According to a further version of the preceding embodiment, the fixing device according to the invention for fixing a dispensing module of an aqueous solution contained in an on-board tank is provided such that: a second through-going hole adapted to supply the pump with an aqueous solution is located in one of a first set of walls substantially perpendicular to said base defining at least one first internal volume.

Such an embodiment thus allows to ensure a minimum filling level of the module without the filling device opening above the module. The orifice is sized to limit the flow rate output from the first internal volume during operation, typically to about 10 kg/h.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is arranged so that: the fixing means comprise a third through hole adapted to feed the pump with an aqueous solution, said third through hole being located on one of a first set of walls substantially perpendicular to the base defining at least one first internal volume.

The third through-going hole may thus be connected to the suction area of the jet pump to allow the aqueous solution located around the first inner volume to return to the module.

According to a preferred embodiment, the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention is provided so that it comprises electrical connection means common to the assembly constituted by the heating means and the pump.

Thus, the connection device may be used to connect the module to the electric circuit of the vehicle, which allows a reduced volume and reduced costs to be obtained.

The overmolded plastic is a plastic selected from the group based on: polyoxymethylene (POM), polyphenylene sulfide (PPS), Polyamide (PA) such as polyphthalamide (PPA), Polyetheretherketone (PEEK), Polyamideimide (PAI), Polyaryletherketone (PAEK), Polyketone (PK) or a polyolefin, preferably Polyethylene (PE), more preferably High Density Polyethylene (HDPE). When the fixing means for fixing the fixing device of the dispensing module for fixing the aqueous solution contained in the on-board tank to said tank are welding flanges, the plastic chosen will be a material chemically compatible with the plastic constituting the tank, such as a polyolefin, preferably Polyethylene (PE), more preferably High Density Polyethylene (HDPE).

The expression "based on the following collection of plastics" means that the plastics comprise at least 50% by weight of the selected plastics.

By "chemically compatible" with another plastic, it is meant that each plastic comprises chemicals that can be welded together without the addition of additional materials. In other words, chemically compatible plastics are suitable for being intimately joined to each other by melting, and are particularly suitable for achieving molecular entanglement of polymer chains therebetween. Welding of two plastics is understood to mean bringing the two plastics into contact so that self-adhesion occurs at the contact. The self-adhesion phenomenon occurs by providing heat at the contact. The operation of welding two materials under the action of heat is called thermowelding. Hereinafter, "welding" is used synonymously with "thermal welding".

"molecular entanglement of polymer chains" of one plastic with another means that the two plastics are pressed together so that self-adhesion occurs. Such self-adhesion is a phenomenon describing intermolecular diffusion across polymer boundaries and molecular chain entanglement that form strong bonds. Self-adhesion, unlike adhesion involving surface energy (or secondary chemical bonds between two materials that are similar or dissimilar), involves molecular chain entanglement and secondary bonds to polymer chains of similar (i.e., chemically compatible) materials. Under ideal conditions, diffusion is complete when the boundary between the two polymeric materials is no longer discernible from the respective masses of the two polymeric materials. For example, with respect to two thermoplastic polymer materials, intermolecular diffusion and entanglement are necessary to complete the process and form a good weld after thermoplastic-thermoplastic contact is achieved at the interface. Such self-adhesion phenomena are described, for example, in the publication Plastics and Composites Welding Handbook, ISBN 1-56990-.

The concept of a base, a substantially vertical wall and a through hole is common to radiators and to fixing devices for fixing a dispensing module of an aqueous solution contained in an on-board tank. However, the concept of a fourth through-going hole unique to the heat sink, which hole or holes are filled with plastic after overmolding, should be distinguished. It is obvious to a person skilled in the art that the heat sink inserted therein by overmolding may not have some wall or walls that are substantially perpendicular to the base present in the fixture.

A second object of the present invention is to provide a module for dispensing an aqueous solution contained in a tank on board a vehicle, said module comprising a fixing device according to the invention, said module comprising a pump rotor inserted inside said pump stator.

A third object of the invention relates to a tank comprising a module for dispensing an aqueous solution contained in a tank for vehicles according to the invention.

The invention also relates to a method for manufacturing a fixing device for fixing a dispensing module of an aqueous solution contained in an on-board tank, comprising at least the following steps:

-manufacturing a heat sink comprising a base and a first set of walls defining at least one first internal volume substantially perpendicular to the base;

-arranging a pump stator within the first interior volume;

-overmolding, preferably with plastic, an assembly of a pump stator and a heat sink, the heat sink comprising a base and a first set of walls defining at least one first internal volume substantially perpendicular to the base.

The step of manufacturing the heat sink comprises a forming step, which may be realized by stamping, by bending, by cutting and welding or by die casting. Preferably, the forming step is achieved by die casting.

The step of arranging the stator within the first internal volume may comprise inserting the pump stator by force-fitting, the pump stator having dimensions substantially equal to the dimensions of the first fixing means of the pump stator, in particular when the first fixing means of the pump stator correspond to a second set of walls defining a second internal volume substantially perpendicular to the base. In this case, the positioning means of the pump stator and the first fixing means of the pump stator are mixed together and are constituted by a second set of walls substantially perpendicular to the base, which define a second internal volume.

The overmoulding step may also comprise overmoulding one or more heating devices integral to the assembly of the pump stator and the radiator, said one or more heating devices being arranged in one or more receptacles provided for this purpose.

Drawings

Other characteristics and advantages of the invention will emerge more clearly from the following description of a preferred embodiment, provided as a simple example, both for purposes of illustration and not for purposes of limitation, and of the accompanying drawings, in which:

figure 1 shows a fixing device for a dispensing module of an aqueous solution contained in an on-board tank according to the invention.

Fig. 2 shows a side view of the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention shown in fig. 1.

Figure 3 shows a radiator, seen before overmoulding with plastic, incorporated in the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention as shown in figures 1 and 2.

Fig. 4 depicts the heat sink of fig. 3 as seen from its base.

Fig. 5 shows another embodiment of a fixing device according to the invention for fixing a dispensing module of an aqueous solution contained in an on-board tank.

Figure 6 shows a radiator, seen before overmoulding with plastic, incorporated in the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention as shown in figure 5.

Fig. 7 shows a view of the heat sink of fig. 6 from the base.

Fig. 8 shows a cross-section of the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention shown in fig. 5.

Detailed Description

An embodiment of a fixing device 1 for fixing a dispensing module of an aqueous solution contained in an on-board tank according to the invention is described below with reference to fig. 1. The fixing device 1 comprises fixing means 2 for fixing to the tank, said fixing means 2 being a welding flange. The fixing device 1 further comprises at least one first internal volume 3 and a second internal volume 4, the second internal volume 4 comprising an insertion region 5 of the pump stator and of the pump rotor and a fixing means 6 of said pump rotor. The fixture 1 comprises at least one first through going hole 7 at the base 8 of the fixture adapted to drain away the aqueous solution pumped by the pump and a second through going hole 9 adapted to supply the pump with the aqueous solution. The first through going hole 7 is in fluid communication with an external part forming the joint 10. A second through-going hole 9 adapted to supply the pump with an aqueous solution is located in the upper part of the first internal volume, the perimeter of the second through-going hole 9 being constituted by a first set of upper edges substantially perpendicular to the walls of the base 8. The fixture 1 further comprises a housing 11 adapted to receive a connection for an injection pump. The ejector pump may also be provided with a regulating tube 12 for a level sensor.

Fig. 2 shows a side view of the fixing device 1 of the dispensing module according to the invention shown in fig. 1 for fixing an aqueous solution contained in an on-board tank. It can be observed that the fixing device 1 comprises fixing means 2 to the tank, said fixing means 2 being a welding flange. The fixing device 1 further comprises at least one first internal volume 3 and a second internal volume 4, the second internal volume 4 comprising an insertion region 5 of the pump stator and of the pump rotor and a fixing means 6 of said pump rotor. The first through going hole 7 is in fluid communication with an external part forming the joint 10. The second through-going hole 9 allows feeding the pump with an aqueous solution. A second through-going hole 9 suitable for feeding the pump with an aqueous solution is located in the upper part of the first internal volume, the perimeter of the second through-going hole 9 being constituted by a first set of upper edges perpendicular to the walls of the base 8. The fixture 1 further comprises a housing 11 adapted to receive a connection for an injection pump. The ejector pump may also be provided with a regulating tube 12 for a level sensor. The fixture 1 is further provided with a third through-going hole 13 adapted to supply the pump with an aqueous solution, said third through-going hole 13 being located in one of the walls of the first set of walls defining the first internal volume 3, substantially perpendicular to said base. This third through-going hole is connected to the suction area of the jet pump to allow the aqueous solution located around the first internal volume 3 to return to the module.

Fig. 3 shows the radiator 14, seen before being overmoulded with plastic, the radiator 14 being incorporated in the fixing device of the dispensing module according to the invention for fixing the aqueous solution contained in the on-board tank, as shown in fig. 1 and 2. The heat sink 14 comprises a base 15 and a first set of walls 16 substantially perpendicular to said base 15 defining at least one first internal volume 17, said base 15 comprising at least one positioning means 18 of the pump stator and first fixing means 19 of the pump stator. At least one wall 16 of the radiator 14, substantially perpendicular to the base 15, comprises at least one second fixing means 20 of the heating means, the radiator 14 comprising at least one first through hole 21 and a second through hole 22, the first through hole 21 being preferably located at the base 15. A second through-going hole 22 is located in the upper part of the first internal volume 17, the perimeter of the second through-going hole 22 being constituted by a first set of upper edges substantially perpendicular to the wall 16 of the base 15. The heat sink 14 is further provided with a third through going hole 23, which third through going hole 23 is located in one of the walls 16 of the first set substantially perpendicular to the base 15 defining the first inner volume 17. At the first set of substantially vertical walls 16 and/or the base 15 of the heat sink 14, the heat sink 14 is provided with at least one, preferably a plurality of overmolded fourth through holes 24. The first set of walls 16, substantially perpendicular to the base 15, also comprises receptacles 25 suitable for receiving connections for the injection pump when the radiator is overmoulded, said receptacles 25 being in the form of grooves (gorge). The first set of substantially vertical walls also comprises a housing 26 adapted to form a conditioning tube for the liquid level sensor. The radiator 14 also comprises a third set of walls 27 substantially perpendicular to the base 15, which third set of walls 27 is closed at the upper end and comprises fourth fixing means suitable for acting as housing for heating means located in the vicinity of the pump stator.

Fig. 4 depicts the heat sink 14 of fig. 3 as seen from its base 15. The first set of substantially vertical walls 16 comprises at least one second fixing means 20 of the heating means. The radiator 14 also comprises a third set of substantially vertical walls 27, said third set of substantially vertical walls 27 being closed at the upper end and comprising fourth fixing means 28 suitable for acting as housing for heating means in the vicinity of the pump stator. It is observed that the first set of walls 16, substantially perpendicular to the base 15, has a plurality of over-moulded fourth through-going holes 24.

Fig. 5 shows another embodiment of a fixing device 1 according to the invention for fixing a dispensing module of an aqueous solution contained in an on-board tank. The fixing device 1 comprises fixing means 2 for fixing to the tank, said fixing means 2 being a welding flange. The fixing device 1 further comprises at least one first internal volume 3 and a second internal volume 4, the second internal volume 4 comprising an insertion region 5 of the pump stator and of the pump rotor and a fixing means 6 of said pump rotor. The fixture 1 comprises at least one first through going hole (not shown in the figures) at the base 8 of the fixture adapted to drain away the aqueous solution pumped by the pump and a second through going hole 9 adapted to supply the pump with the aqueous solution. The first through going hole is in fluid communication with the exterior portion forming the joint 10. A second through-going hole 9 adapted to supply the pump with an aqueous solution is located in the upper part of the first internal volume, the perimeter of the second through-going hole 9 being constituted by a first set of upper edges substantially perpendicular to the walls of the base 8. The fixture 1 further comprises a housing 11 adapted to receive a connection for an injection pump. The ejector pump may also be provided with a regulating tube 12 for a level sensor.

Fig. 6 shows the radiator 14 seen before overmoulding with plastic, said radiator 14 being incorporated in the fixing device of the dispensing module for fixing an aqueous solution contained in an on-board tank according to the invention as shown in fig. 5. The heat sink 14 comprises a base 15 and a first set of walls 16 substantially perpendicular to said base 15 defining at least one first internal volume 17, said base 15 comprising at least one positioning means 18 of the pump stator and first fixing means 19 of the pump stator. The positioning means 18 of the pump stator and the first fixing means 19 of the pump stator are blended together and are constituted by a second set of walls 29 substantially perpendicular to the base 15, defining a second internal volume 30, which is embedded in the first internal volume 17, said second internal volume 30 acting as a housing for the pump stator. At least one substantially vertical wall 16 of the radiator 14 comprises at least one second fixing means 20 of the heating means, the radiator 14 comprising at least one first through hole 21, preferably at the base 15, and a second through hole 22. A second through-going hole 22 is located in the upper part of the first internal volume 17, the perimeter of the second through-going hole 22 being constituted by a first set of upper edges substantially perpendicular to the wall 16 of the base 15. At the first set of substantially vertical walls 16 and/or the base 15 of the heat sink 14, the heat sink 14 is provided with at least one, preferably a plurality of overmolded fourth through holes 24. The first set of walls 16, substantially perpendicular to the base 15, also comprises receptacles 25 suitable for receiving connections for the injection pump when the radiator is overmoulded, said receptacles 25 being in the form of grooves (gorge). The first set of substantially vertical walls also includes a receptacle 26 adapted to form a regulator tube 12 for the liquid level sensor.

Fig. 7 depicts the heat sink 14 of fig. 6 as seen from its base 15. The first set of substantially vertical walls 16 comprises at least one second fixing means 20 of the heating means. It is observed that the first set of walls 16, substantially perpendicular to the base 15, has a plurality of over-moulded fourth through-going holes 24.

Fig. 8 shows a cross section of the fixing device 1 for fixing a dispensing module for aqueous solutions contained in an on-board tank according to the invention shown in fig. 5. The cross-section of the fixture 1 shows the over-moulding of the pump stator 31 and the heat sink 14 with plastic.