EP4058173A1

EP4058173A1 - Recess for receiving a filter cartridge

Info

Publication number: EP4058173A1
Application number: EP20800956.3A
Authority: EP
Inventors: Diouf CHEIKH; Romain JACQUES
Original assignee: Actblue Europe SARL
Current assignee: Actblue Europe SARL
Priority date: 2019-11-14
Filing date: 2020-11-10
Publication date: 2022-09-21
Also published as: WO2021094281A1; CN115279476A; FR3103116B1; FR3103116A1; US20230001337A1

Abstract

Disclosed is an axial extension part which enables the use a filter cartridge (25) of larger axial dimensions than a standard filter cartridge for which the axial depth of a recess (11) of a housing (10) of a selective catalytic reduction device (SCR) has been provided. This makes it possible to have different filtration properties, without the need to modify the casing. The filter cartridge (25) of larger dimensions can be inserted in the extension part when this part is mounted in the recess (11) of the housing (10). The cartridge is enclosed there, in a sealed manner, when the closure plug (21) is put in place in order to close the opening at the rear end of the part.

Description

DESCRIPTION

HOLLOW HOUSING TO RECEIVE A FILTER CARTRIDGE

[Technical field] The present invention relates generally to the distribution of liquid additive used for example in a device for treating the exhaust gases of a motor vehicle such as a device for treatment by selective catalytic reduction (or SCR device, set for “Selective catalytic reduction” in English), and more particularly to an axial extension part of a hollow housing in a housing of such a device, designed to receive a filter cartridge.

The invention finds applications, in particular, in motor vehicles, in particular but not only those equipped with a diesel engine, for example in light vehicles, utility type vehicles or in trucks (or heavy vehicles) comprising such an engine.

[State of the prior art]

The exhaust gases generated by vehicles with compression ignition engines (known as diesel engines) or by vehicles with positive ignition engines (known as gasoline engines) are in particular composed of gaseous atmospheric pollutants such as carbon oxides ( called "Cox", for CO and C02) and nitrogen oxides (called "NOx" for NO and N02). Diesel engines, in particular, are subject to regulations aimed at reducing the amount of polluting gases they emit. The standards capping the levels of nitrogen oxides emitted are an example, they tend to be more and more restrictive.

In the particular case of vehicles equipped with a diesel engine, the pollution control of the engine exhaust gases can be carried out by means of a gas treatment device implementing a pollution control method such as the selective catalytic reduction method. (or SCR method). The SCR method uses a depolluting liquid additive to selectively reduce nitrogen oxides (NOx) in exhaust gases. By liquid additive depolluting is meant a depolluting product which can be injected into an engine exhaust gas treatment device for the purpose of depolluting the exhaust gases before they are released into the atmosphere.

The liquid additive commonly used in the SCR method is a diesel exhaust fluid (or DEF, put for “Diesel exhaust fluid”) which is an aqueous solution of 32.5% urea ( by weight), also marketed under the brand AdBlue®. The aqueous urea solution is a precursor of ammonia (NH3). This ammonia reacts with nitrogen oxides (NOx) in the exhaust gases to produce less polluting species, namely dinitrogen (N2), water and carbon dioxide (CO2). Thus, the ammonia used in the SCR method is a reducing agent, supplied as a liquid additive.

In vehicles, the liquid additive is stored in a dedicated tank, which is equipped with a dosing module also called a liquid additive dispensing device. The liquid additive dispensing device is suitable for taking the liquid additive, metering out a determined quantity and injecting it into the device for treating the exhaust gases with a view to the depollution of said gases. For this, the liquid additive dispensing device comprises a housing in which are arranged functional components such as in particular means for pumping, for filtering and / or for dosing the liquid additive, means for measuring the quantity of additive. liquid present in the tank, sensors such as a temperature sensor for the liquid additive present in the tank, means for heating the liquid additive suitable for thawing it if necessary, etc.

This dedicated tank represents additional space for the vehicle.

Thus, advantageously, the metering module can be placed in the liquid additive reservoir so that its housing occupies part of the space in the reservoir.

Documents DE102006040411A1 and DE102012003156A1 disclose filter cartridges for an SCR device. Such filter cartridges are generally removable, so that they can be replaced during the life of the SCR device. It appears that it is desirable to be able to use filter cartridges offering different filtration capacities without necessarily having to modify the design of an existing dosing module. Indeed, depending on the vehicle, certain applications require the use of a filter having, for example, a better capacity to retain impurities (“dust-holding capacity”) and / or a lower pressure loss (“ Pressure drop ”in English) than other applications. Obtaining such improved characteristics may necessitate the use of a larger filter cartridge than a standard sized cartridge for which a metering module may have been designed.

A technical problem which then arises is the lack of flexibility in the filtration capacities for a given dosing module, having a housing of determined dimensions and shapes.

[Disclosure of the invention]

The invention aims to eliminate, or at least mitigate, all or part of the aforementioned drawbacks of the prior art.

To this end, a first aspect of the invention proposes an extension piece of a hollow housing provided in a housing to receive a first filter cartridge, said housing extending along a longitudinal axis determined between a first axial end and a second. opposite axial end, and having an opening at the first axial end for insertion of said first filter cartridge into the housing parallel to the direction of the longitudinal axis of the housing, as well as a bottom at the second end axial, said housing having a determined axial depth, between said opening and said bottom, and having at least one circumferential wall extending substantially parallel to said direction and forming an envelope of determined shape, said extension piece having a longitudinal axis and comprising : a) a first axial end through which the part can be inserted into the housing of the housing, and a second axial end provided with an opening through which a second filter cartridge, of axial length greater than the axial depth of the housing, can be inserted and sealed in the part when said part is mounted in the housing of the housing; b) a first axial section of axial length substantially equal, by values less than the axial depth of the housing of the housing, having a perforated bottom at the level of the first axial end of the part, and having at least one circumferential wall forming an envelope perforated substantially conforming to the casing of the housing of the housing so as to be able to take place in said housing; c) a second axial section, extending in the axial direction in the extension of the first axial section on the side opposite the first axial end of the part and up to the second axial end of the part, and having at least one wall circumferential forming a non-perforated envelope which axially extends the perforated envelope of the first section; d) a first connection zone, in an axial position between the first axial section and the second axial section of the part, and having first connection means cooperating with complementary connection means of the housing at the level of the opening of the housing of the case, for the watertight fixing of the part to the case; and, e) a second connection zone, at the level of the second axial end of the part, and having second connection means for the sealed fixing of a stopper capable of ensuring the leaktight closure of the part.

Thanks to the invention, it is possible to use a filter cartridge of greater axial length than a standard filter cartridge for which the axial depth of the housing in the housing has been provided, without having to modify the housing.

Embodiments taken alone or in combination further provide that:

- the circumferential wall of the first section may comprise a first external annular groove, extending circumferentially around the first section in a plane perpendicular to the longitudinal axis which is adjacent to the first axial end of said first section, as well as a first seal annular extending in said first annular groove and capable of ensuring the seal between the circumferential wall of the first section of the part and the circumferential wall of the housing when the part is mounted in the housing; - the circumferential wall of the first section may comprise a second external annular groove, extending circumferentially around the first section in a plane perpendicular to the longitudinal axis which is adjacent to the first connecting zone of the part, on the side of the first axial end of the first section of the part with respect to said connecting zone, as well as a second annular seal extending in said annular groove and capable of ensuring the seal between the circumferential wall of the first section of the part and the wall circumferential of the housing when the part is inserted into the housing by its first distal end;

- the housing of the housing being cylindrical in shape and the housing connection means at the level of the opening of the housing of the housing comprising an internal thread provided for the fixing by screwing of a sealed closure cap of the housing, the first connection means of the part may include a complementary thread of said internal thread;

- The second connecting means of the part may have an internal thread identical to the internal thread of the housing at the level of the opening of the housing of the housing;

the part may include active heating elements suitable for, when the part is mounted in the housing of the housing, heating the fluid in the part and / or in the housing of the housing; and,

- the second section may comprise at least one portion which is deformable towards the outside of the part which are adapted to, when the part is mounted in the housing of the housing, compensate for an increase in the volume of fluid in the part and / or in the housing of the housing due to the freezing of said fluid.

In a second aspect, the invention also relates to a set comprising: a) a liquid additive dosing module for a device for treating the exhaust gases of a motor vehicle having a housing with a housing which is adapted to receive a removable filter cartridge and having an inlet for the insertion of the filter cartridge and a bottom opposite said inlet in the direction of an axis of insertion of the filter cartridge in the housing, and which has a determined length, according to said direction, between said inlet and said bottom having circumferential walls extending substantially parallel to said direction and forming an envelope of determined shape; as well as b) an extension piece according to the first aspect above adapted to axially extend the housing of the housing so as to allow the use of another filter cartridge of larger axial dimensions than the first filter cartridge.

In a third aspect, the invention also relates to a device for treating the exhaust gases of a motor vehicle comprising a set according to the second aspect.

[Description of the drawings] Other features and advantages of the invention will become apparent from the description which follows. This is purely illustrative and should be read in conjunction with the accompanying drawings in which:

[Fig. 1]: FIG. 1 is a functional diagram of a motor vehicle engine with an exhaust gas treatment device for the reduction of NOx;

[Fig. 2]: Figure 2 is a simplified diagram of a fluid manifold in which a hollow housing is provided for the arrangement of a removable filter cartridge;

[Fig. 3]: Figure 3 is a diagram of the fluid manifold of Figure 2 with a filter cartridge of standard dimensions arranged in the housing, with a plug sealing the housing, and with fluid under pressure;

[Fig. 4]: Figure 4 is a schematic diagram, in section, of an extension part of the housing of the fluid manifold of Figure 2 according to embodiments;

[Fig. 5]: Figure 5 is a diagram of the fluid manifold of Figure 2 with the part of Figure 4 mounted in the housing, and with a filter cartridge of axial length greater than the filter cartridge of Figure 3 arranged in the room ; [Fig. 6]: FIG. 6 is a perspective view of an extension piece according to one embodiment; and,

[Fig. 7]: Figure 7 is a longitudinal sectional view of the extension part of Figure 6, mounted in the housing of a fluid manifold adapted to receive a standard filter cartridge.

[Description of embodiments]

In the description of embodiments which will follow and in the figures of the accompanying drawings, the same or similar elements bear the same reference numerals in the drawings. Figure 1 schematically shows a motor vehicle 100 with an internal combustion engine 110, for example a diesel engine. The motor vehicle 100 is for example a passenger car, a utility vehicle, a truck or a coach. The motor vehicle 100 also includes an exhaust gas treatment device 120 with a module 130 for implementing the pollution control method known as the SCR method. The vehicle 100 also comprises a reservoir 140 for the liquid additive 150, coupled to an injector 170 to introduce the liquid additive 150 into the gas treatment device 120, via an additive dosing module 160. liquid.

The dosing module 160, or liquid additive distribution device, comprises a housing in which are arranged, in particular, functional components for taking the liquid additive and conveying it to the injector 170, heating it if necessary, and filter it, as well as sensors to deliver various information on the quantity and quality of the liquid additive present in the reservoir 140. Among the elements thus arranged in the housing, there is for example: a pump for taking water. liquid additive from the reservoir, conduits for conveying the liquid additive taken by the pump to the injector 170, at least one valve, various sensors such as level, pressure, temperature and / or flow sensors, a electronic control unit, at least one filter, one liquid additive heater, etc. The liquid additive can be a 32.5% aqueous urea solution such as the solution under the trademark AdBlue®. When the 110 engine produces gas exhaust, these gases are directed to the exhaust gas treatment device 120. The exhaust gas treatment device 120 is supplied with liquid additive 150 by means of the liquid additive distribution device, or metering module 160, and to the injector 170. The metering module 160 doses the amount of liquid additive to be injected. Then, thanks to the pipe 180 to which the module 160 is connected, the liquid additive is routed to the injector 170. The injector 170 introduces the depolluting solution into the device 120, in order to allow the selective catalytic reduction of NOx according to the method. SCR in a gas treatment zone 130 of said device 120. Exhaust gas pollution control is thus carried out.

Advantageously, the housing of the dosing module 160 is partially disposed in the interior space of the reservoir 140. The part of the housing disposed in the reservoir 140 offers a surface in contact with the liquid additive 150 present in the reservoir. The housing can be made of aluminum, for example, and can be covered with a non-technical polymeric material such as high density ethylene polymer (HDPE), which offers the advantage of not reacting with Adblue®, which is a corrosive solution. Thus, a heater can be connected to parts of the aluminum housing which are in contact with the liquid additive in the tank, in order to transmit heat to the liquid additive by conduction. In particular, this makes it easier to thaw the liquid additive, if necessary.

As a variant, the housing can be made of HDPE. This polyethylene is the basic polymer in mechanical engineering and one of the cheapest. It is an inert plastic, that is to say a material which does not chemically react and / or does not deteriorate when in contact with a solution of chemical agent such as a solution of urea. In addition, it is easy to handle and resistant to cold.

As a further variant, the housing can also be made of a technical polymer material, such as, for example, a polymer of oxymethylene (POM), of polyamide, of polyimide or a mixture thereof. Such a technical material has better mechanical properties allowing the creation of interfaces of complex shape on the body of the case with a tolerance, that is to say a relatively tight dimensional uncertainty, for example of the order of ± 0.05 millimeters (mm).

In all cases, the liquid additive reservoir and the housing of the dosing module advantageously form a compact assembly thus making it possible to save space in the motor vehicle. In the configuration as shown in Figure 1, for example, the housing does not project outwardly from the reservoir 140.

FIG. 2 shows, in section, a portion of the housing 10 of a liquid additive metering module such as the module 160 of FIG. 1. This portion of the housing 10 forms part of the fluid manifold. Anglo-Saxon). It more particularly comprises a hollow housing 11 provided in the housing to receive a filter cartridge, which may be removable. Such a filter cartridge, not shown in FIG. 2, has the function of, and is suitable for filtering the impurities in a fluid. In the envisaged application, the fluid is the Adblue® liquid additive, pumped into the reservoir 140, and which must be filtered before it is injected by the injector 170 into the exhaust gas treatment device 120 of FIG. 1.

For the purposes of this description, it will be considered that the filter cartridge concerned is a standard cartridge, that is to say a cartridge of standard dimensions.

With reference to FIG. 2, the housing 11 extends along a determined longitudinal axis X, between a first axial end and a second opposite axial end. It has an opening 14 at the level of the first axial end, for the insertion of the standard filter cartridge (not shown in FIG. 2). The insertion of the filter cartridge into the housing 11 via the opening 14 takes place parallel to the direction of the longitudinal axis X of the housing. The housing 11 also has a bottom 15 at the level of the second axial end. In what follows and unless expressly stated otherwise, the terms "front," rear "," in front of "," behind ", and" depth ", are used with reference to the direction of insertion into the housing according to the direction of the longitudinal axis X, from the opening 14 towards the bottom 15 of the housing 11. The housing 11 has a determined axial depth. By axial depth is meant a depth in the direction of the longitudinal axis X. This axial depth can be measured, for example, between the opening 14 and the bottom 15 of the housing 11.

In addition, the housing 11 has at least one circumferential wall 16. The term “circumferential wall” is understood to mean a wall extending substantially parallel to the direction of the longitudinal axis X, around said axis, and forming the casing of the housing 11. This envelope has a determined shape, for example the shape of a cylinder. In other words, the section of the casing of the housing 11 is, in this example, a circle. In other examples, it can be a polygon, when the housing has several flat walls, adjacent two by two, and extending parallel to the direction of the longitudinal axis X. Envelopes of more complex shapes are obviously possible, depending on the needs of the application. However, a cylindrical casing is the most general case because the filter cartridges intended to take place in the housing are generally cylindrical in shape.

The housing 11 has a connection zone at the level of the opening 14, in which zone of the connection means 19 are provided for the sealed connection with a plug 21 for closing the housing. In the example shown of a cylindrically shaped housing, the connecting means 19 of the housing 11 comprise an internal thread, adapted to cooperate with complementary connecting means of the plug 21 comprising a thread 22. The sealing of the closure of the housing 11 by the plug 21 via these connecting means can be provided by an O-ring 18, not shown in FIG. 2 but visible in FIG. 3, which is placed at the level of the connection zone of the housing 11 comprising the internal thread 19, or of the end of the plug 21 comprising the thread 22, for example after the insertion of the filter cartridge and before the assembly of the plug. As a variant, in particular if the housing has a non-cylindrical casing, the complementary connection means of the housing 11 and of the stopper 21 may comprise bayonet connection means, for example, or any other equivalent means within the reach of the man of the job. The fluid manifold shown in Figure 2 comprises an inlet pipe 12 opening into the housing 11 for the entry of the unfiltered fluid into the housing, and a discharge pipe 13 for the outlet of the filtered fluid from the housing 11. The admission of the fluid through the pipe 12, its passage through the filter cartridge in the housing 11, and its discharge through the pipe 13, are carried out by pressure difference between the inlet circuit comprising the pipe 12 and the pressure circuit. discharge comprising line 13. This pressure difference is obtained by means of a fluid suction pump arranged upstream of line 12 or downstream of line 13, that is to say on the side of the additive reservoir liquid 140 or on the side of the exhaust gas treatment device 120 of FIG. 1, respectively, with respect to the filter.

In Figure 3, arrows illustrate the flow of fluid from the visible inlet of the intake line 12 to the visible outlet of the discharge line 13, through a standard filter cartridge 20 when in place. in the housing 11 and that said housing is closed by the stopper 21. As can be seen in the figure, an O-ring 16 is placed slightly in front of the bottom 15 of the housing 11 of the housing, and against which rests the front end of the filter cartridge 20. Thus, a delivery chamber 17 forms between said front end of the standard filter cartridge 20 and the bottom 15 of the housing 10, in which the filtered fluid exits from the front of the chamber. filter cartridge 20. The delivery pipe 13 discharges the filtered fluid from said chamber 17. In addition, the O-ring 18 already mentioned above with reference to FIG. 2 is placed at the level of the connection zone of the housing 11 with the thread 19, cont re which presses the front end of the plug 21 when the thread 22 engages with the internal thread 19. Thus, an intake chamber 17a is created between the cylindrical body of the filter cartridge and the housing of the housing 11. The pipe d 'admission 12 opens into said chamber 17a. The fluid enters the filter cartridge 20 through its circumferential envelope, and comes out filtered, through the aforementioned front end of said cartridge 20.

Finally, the housing 10 comprises heating means 31 and 32 arranged around the housing 11, in the housing body, which are adapted to selectively heat the fluid in said housing, for example when the temperature of the fluid or surrounding temperature is measured below a certain threshold. These heating means can be heating resistors, for example. In particular, they allow the liquid AdBlue® additive to be thawed when it is frozen.

The desired compactness for the assembly formed of the liquid additive reservoir 140 and of the dosing module 160, which has already been mentioned above with reference to the diagram of FIG. 1, leads to designing a dosing module with minimum dimensions, that is, just sufficient to meet the needs of standard applications. This concerns in particular the housing 11 provided in the housing 10 of the dosing module to receive the standard filter cartridge 20.

However, certain applications require the use of a filter having, for example, a better capacity to retain impurities ("Dust-holding capacity") and / or a lower pressure loss ("Pressure drop" in English). Anglo-Saxon). Achieving such improved characteristics may necessitate the use of a larger filter cartridge than a standard sized cartridge for which a dosing module may have been designed. In such a case, a person skilled in the art not benefiting from the teaching of the invention will have to modify the design of the housing in order to provide a larger housing suitable for receiving a filter cartridge of larger dimensions.

In order to allow the use of another filter cartridge, of larger dimensions than those of the standard filter cartridge for which the housing 11 in the housing 10 of FIG. 2 has been provided, embodiments of the invention propose the use of an extension part of the housing 11. It is more particularly an axial extension of the housing 11, that is to say an extension in the direction of the longitudinal axis X. This extension allows to enlarge the axial depth (in the aforementioned sense) of the space intended to receive the other filter cartridge, beyond the distance between the opening 14 and the bottom 15 of the housing 11. In this sense, the part of extension is an adapter because it allows to adapt a filter cartridge of larger axial dimensions for use in the housing 11 of smaller axial dimensions. The simplified diagrams of Figure 4 and Figure 5 show, in section, respectively the extension part 40 alone and said extension part 40 in the housing 11 of the housing 10 of Figure 2. In the configuration of Figure 5, furthermore, the larger filter cartridge 25 is placed in the adapter 40. Fig. 6 shows a three-dimensional view, in perspective, of one embodiment of the extension piece 40, and Fig. 7 shows a sectional view of the part 40 of Figure 6 and of the housing 11 in the housing 10. In these figures, the same elements as those already described with reference to Figures 2 and 3 bear the same references and their description will not be not resumed.

The extension part 40 is a hollow part, adapted to receive the filter cartridge of larger dimensions 25. The extension part 40 has a longitudinal axis, which coincides with the longitudinal axis X of the housing 11 in the housing 10 when the part 4 is mounted in said housing. For the sake of simplicity, reference will be made to the longitudinal axis X to denote indiscriminately the longitudinal axis of the housing 11 of the housing 10 on the one hand, and the longitudinal axis of the part 40, on the other hand.

The part 40 comprises a first axial end through which the part can be inserted into the housing 11 of the housing 10, called the “front end” in what follows. It also includes a second axial end, opposite the front end, and called "rear end" in the following. The part 40 is provided with an opening 44 at its rear end, through which the filter cartridge 25 can be inserted into the part 40 even when the latter is engaged in the housing 11 by its front end.

As shown in particular in Figures 4 and 6, the part 40 comprises two axial sections 41 and 42, which extend in the axial extension of one another.

On the side of the front end, the part thus comprises a first axial section 41, or front section, of axial length substantially equal, by values smaller than the axial depth of the housing 11 of the housing 10. The front section 41 has a bottom perforated, due to an opening 47 at the front end of the part 40. The front section 41 has at least one circumferential wall forming an envelope substantially conforming to the envelope of the housing 11 of the housing so as to be able to take place in said housing 11. This casing is perforated, due to the presence of side openings 45 and 46.

Preferably, the openings 45 and 46 extend parallel to the direction of the longitudinal axis X and have a length substantially equal to the axial length of the front section 41, in order to provide the greatest possible passage for the fluid without too much adversely affect the rigidity of the part 40.

On the rear end side, part 40 further comprises a second axial section 42, or rear section. This extends in the axial direction in the extension of the first front section 41, on the side opposite the front end of the part 40, and to the rear end of the part 40. The rear section 42 has at least one circumferential wall forming a non-perforated envelope, which axially extends the perforated envelope of the front section 41. When the front section 41 is completely inserted into the housing 11 of the housing 10, as shown in FIG. 5 and in FIG. 7 , the rear section 42 projects axially outside said housing 10, in the direction opposite to the bottom 15 of the housing 11 of the housing 10.

The sections 41 and 42 are delimited between them, axially, by a first connection zone comprising means for the connection of the part 40 to the housing 10. These connection means comprise for example a thread 48 of the part 40 able to cooperate with the thread 19 of the housing 10 at the level of the opening 14 of the housing 11 of the housing 10. In other words, the means for connecting the part 40 to the housing 10 are arranged in an axial position corresponding substantially to the junction between the first axial section 41 and the second axial section 42 of the part 40. The aforementioned connecting means 48,19 are able to achieve the sealed fixing of the part 40 to the housing 10. To obtain this sealing, the connecting means can comprise and cooperate with a seal 38. In the example shown, seal 38 is an annular seal, for example an O-ring.

In other words, and assuming that the housing 10 of the housing is cylindrical in shape, the connecting means of the part 40 to the housing 10, provided at the level of the opening 14 of the housing 11 of the housing 10, comprise the internal thread. 19 in the housing 10 which is provided for the screw fixing of the sealing cap 21 of the housing 11 when a standard filter cartridge 20 is used (Figure 3), on the one hand, as well as the first connecting means of the part 40 comprising the thread 48 which is complementary to said thread 19, on the other hand.

The part 40 comprises a second connection zone, at the rear end of the part, with second connection means for the sealed fixing of a plug capable of ensuring the leaktight closure of the part. The stopper can advantageously be the stopper 21 used to close the housing 11 of the housing 10 when it contains the standard filter cartridge 20, or an identical stopper also comprising a thread 22. Whereby the connecting means of the stopper 21 comprise the thread. 22 of the stopper 21, on the one hand, and second connecting means of the part 40 comprising an internal thread 49 complementary to the thread 22 at the rear end of the part 40, on the other hand. The tapping 49 is preferably identical to the tapping 19 of the housing 10 at the level of the opening 14 of the housing 11 of the housing 10, to allow the re-use of the stopper 21. The tightness of this connection between the part 40 and the stopper 21 can be provided by an annular seal, for example an O-ring, such as for example the seal 18 already described above with reference to the diagram of Figure 3, or an identical or similar seal.

In other words, and still assuming that the housing 10 of the housing is cylindrical in shape, the second connecting means of the part 40 comprise, at the rear end of the part, an internal thread 49 identical to the internal thread 19. of the housing 10 at the level of the opening 14 of the housing 11 of the housing 10. This allows the reuse of the same cap 21 as that provided for uses in which a standard filter cartridge is used, if necessary with the same gasket 18.

In one embodiment, the circumferential wall of the first section 41 comprises a first external annular groove (that is to say open on the side of the wall which is opposite to the longitudinal axis X), extending circumferentially around the first section in a plane perpendicular to the longitudinal axis which is adjacent to the front end of said first section, as well as a first annular seal 36 extending in said first annular groove. This seal 36, for example an O-ring as shown, is capable of ensuring the seal between the circumferential wall of the first section 41 of the part 40 and the wall. circumferential 16 of the housing 11, substantially at the level of the bottom 15 of the housing, when the part 40 is mounted in the housing with the section 41 entirely housed in the housing 11.

In another embodiment, the circumferential wall of the first section 41 can also include a second external annular groove (that is to say open on the side of the wall which is opposite to the longitudinal axis X), extending circumferentially around the first section 41 in a plane perpendicular to the longitudinal axis which is adjacent to the first connection zone (ie, the connection zone with the thread 48) of the part 40, on the side of the rear end of the first section 41 of said part 40 with respect to said connecting zone, as well as the annular seal 38 (already presented above) extending in said annular groove.

Thus arranged, the seal 38, for example an O-ring as shown, is able to provide the seal between the circumferential wall of the first section of the part and the circumferential wall of the housing 11, substantially at the level of the opening 14 of the housing. , when the part 40 is mounted in the housing with the section 41 fully housed in the housing 11.

With reference to the simplified diagram of FIG. 5, the circulation of the fluid in the manifold is as follows when the cartridge of larger dimensions 25 is used in combination with the extension piece or adapter 40. As shown by the arrows in FIG. 5 , the fluid is admitted into the housing 11 and enters the part 40 via the side openings 4546 formed in the front section 41. It is prevented from passing directly into the delivery chamber 17, due to the O-ring 36. Under the effect of the pressure, it then passes through the circumferential envelope of the filter cartridge 25, and this not only at the level of the front section 41 but also at the level of the rear section 42 of the part 40. As a result, the exchange surface between the fluid and the casing of the filter cartridge 25 is increased compared to the use of the standard filter cartridge 20 of FIG. 3. As a result, in particular, the pressure drop due to the filter little t be reduced, and / or can be compensated or limited even when the filter cartridge 25 includes pores smaller than the pores of the standard cartridge 20 in order to provide better impurity retention capacity. The fluid then exits the filter cartridge 25 at the level with the front end of the part 40, towards the bottom 15 of the housing 11 of the housing 10.

In some embodiments, the part 40 may comprise active heating elements 33 and 34, arranged for example in the walls of the second section 42. These means 33 and 34, visible in FIG. 5, are suitable for, when the part

40 is mounted in the housing 11 of the housing 10, heating the fluid in the part 40 and / or in the housing 11. This is particularly useful because, the second section 42 of the part 40 projecting outwardly of the housing 10, the risk of the Adblue® liquid additive freezing in winter is increased compared to the use of the standard filter cartridge 20 (figure 3). These elements 33 and 34 can be controlled by the same means as those which control the heating elements 31 and 32 of the housing 10. For this purpose, connection wires (not shown) can connect the part 40 to a connector (not shown). of the housing 10. In another embodiment, the rear section 42 of the part 40 may comprise portions 50 which are deformable outwardly of the part 40 (that is to say by moving away from the longitudinal axis X). Such portions 50 are suitable for, when the part 40 is mounted in the housing 11 of the housing 10, compensating for a possible increase in the volume of fluid in the part 4 and / or in the housing 11 due to the freezing of said fluid. To this end, the portions 50 may have a lesser thickness, and / or not have ribbed reinforcements unlike the other portions of the rear section 42 of the part 40, visible for example in FIG. 6 and in FIG. 7, between the deformable portion 50 and the opening 44 at the rear end of the part 40. As has been understood, the extension part 40 allows the use of a filter cartridge 25 of larger axial dimensions than the standard filter cartridge 20, while retaining the housing 10 with the housing 11, the axial depth of which has been designed to receive the standard filter cartridge 20. The filter cartridge of larger dimensions 25 can be inserted into the extension piece 40 when said piece is mounted in the housing 11 of the housing 10. It is sealed therein ("leakproof" in English) when the closure cap 21 is put in place to close the opening 44 at the rear end of the part 40.

The part 40 can be made of aluminum, for strength, and then be covered with high density ethylene polymer (HDPE). As a variant, it can be made of HDPE. It can also be made of oxymethylene polymer (POM), polyamide, polyimide or a mixture thereof.

The present invention has been described and illustrated in the present detailed description and in the figures of the accompanying drawings, in possible embodiments. The present invention is not, however, limited to the embodiments presented. Other variants and embodiments can be deduced and implemented by a person skilled in the art on reading the present description and the accompanying drawings.

In this discussion, the term "include" or "include" does not exclude other elements or steps. The different characteristics presented can be advantageously combined. Their presence in different parts of the present patent application does not exclude this possibility. The reference signs to the drawings should not be understood as limiting the scope of the invention.

Claims

[Claim 1] Part (40) for extending a hollow housing (11) provided in a housing (10) for receiving a first filter cartridge (20), said housing extending along a longitudinal axis (X) determined between a opposing first axial end and a second axial end, and having an opening (14) at the first axial end for insertion of said first filter cartridge into the housing parallel to the direction of the longitudinal axis of the housing, as well as 'a bottom (15) at the second axial end, said housing having a determined axial depth, between said opening and said bottom, and having at least one circumferential wall (16) extending substantially parallel to said direction and forming a envelope of determined shape, said extension piece having a longitudinal axis and comprising: a) a first axial end through which the piece can be inserted into the housing of the housing, and a second axial end provided with an opening (44) through which a second filter cartridge (25), of axial length greater than the axial depth of the housing, can be inserted and sealed in the part when said part is mounted in the housing housing; b) a first axial section (41) of axial length substantially equal, by values less than the axial depth of the housing of the housing, having a perforated bottom (47) at the level of the first axial end of the part, and having at least a circumferential wall forming a perforated casing (45,46) substantially conforming to the casing of the housing of the housing so as to be able to take place in said housing; c) a second axial section (42), extending in the axial direction in the extension of the first axial section on the side opposite to the first axial end of the part and up to the second axial end of the part, and having at least at least one circumferential wall forming a non-perforated envelope which axially extends the perforated envelope of the first section; d) a first connection zone, at an axial position between the first axial section and the second axial section of the part, and having first means connection (48) cooperating with complementary connection means (19) of the housing at the level of the opening of the housing of the housing, for the sealed fixing of the part to the housing; and, e) a second connection zone, at the level of the second axial end of the part, and having second connection means (22) for the sealed fixing of a stopper (21) capable of ensuring the leaktight closure of the part. room.

[Claim 2] Part according to claim 1, in which the circumferential wall of the first section comprises a first external annular groove, extending circumferentially around the first section in a plane perpendicular to the longitudinal axis which is adjacent to the first axial end. of said first section, as well as a first annular seal (36) extending in said first annular groove and capable of sealing between the circumferential wall of the first section of the part and the circumferential wall of the housing when the part is mounted in the accommodation.

[Claim 3] A part according to claim 1 or claim 2, wherein the circumferential wall of the first section comprises a second outer annular groove, extending circumferentially around the first section in a plane perpendicular to the longitudinal axis which is adjacent to it. the first connecting zone of the part, on the side of the first axial end of the first section of the part with respect to said connecting zone, as well as a second annular seal (38) extending in said annular groove and capable of ensuring the seal between the circumferential wall of the first section of the part and the circumferential wall of the housing when the part is inserted into the housing via its first distal end.

[Claim 4] Part according to any one of the preceding claims, in which, the housing of the housing being cylindrical in shape and the housing connecting means at the level of the opening of the housing of the housing comprising an internal thread (19) provided for the fixing by screwing of a sealing plug of the housing, the first connecting means of the part comprise a thread (48) complementary to said internal thread.

[Claim 5] Part according to claim 4, in which the second part connecting means comprise an internal thread (49) identical to the internal thread (19) of the housing at the level of the opening of the housing of the housing.

[Claim 6] Part according to any one of the preceding claims, comprising active heating elements (33,34) adapted to, when the part is mounted in the housing of the housing, heat the fluid in the part and / or in the housing. of the housing.

[Claim 7] Part according to any one of the preceding claims, wherein the second section comprises at least one portion (50) deformable outwardly of the part which are adapted for, when the part is mounted in the housing of the housing. , compensate for an increase in the volume of fluid in the part and / or in the housing of the housing due to the freezing of said fluid.

[Claim 8] Set comprising: a) a module (160) for dosing liquid additive (150) for a device (120) for treating the exhaust gases of a motor vehicle (100) having a housing (10) with a housing (11) adapted to receive a removable filter cartridge (20) and having an inlet (14) for the insertion of the filter cartridge as well as a bottom (15) opposite said inlet in the direction of an axis d 'insertion of the filter cartridge in the housing, and having a determined length, in said direction, between said inlet and said bottom, and having circumferential walls (16) extending substantially parallel to said direction and forming an envelope of determined shape ; and, b) an extension piece according to any one of the preceding claims, adapted to axially extend the housing of the housing e so as to allow the use of another filter cartridge (25) of larger axial dimensions than the first cartridge. filtering.

[Claim 9] A device for treating the exhaust gases of a motor vehicle comprising a set according to claim 8.