Fastening assembly for a filter element

Abstract

The invention relates to a fastening assembly for a filter element, comprising a first structure (3) which has a cylindrical overall shape along a longitudinal axis (L), a wall (5) arranged connected so as to close one end of the first structure (3), the wall (5) and / or the first structure (3) having at least one first aperture (15), a second structure (2) having a cylindrical overall shape substantially along the longitudinal axis (L) and having at least one second aperture (16), the first structure (3) and the second structure (2) being arranged coaxially with one another, the first structure (3) being arranged at least partially fitted onto the second structure (2), the at least one second aperture (16) being in fluid connection with the at least one first aperture (15), an elastic fastening means (7) having a circular overall shape and having a center in at least one plane substantially perpendicular to the longitudinal axis (L), the elastic fastening means (7) comprising projecting zones (17, 17'), the elastic fastening means (7) being arranged close to the wall (5) while still being entirely circumscribed within a space delimited by an inner surface of the first structure (3), the elastic fastening means (7) being configured so as to control a longitudinal movement between the first structure (3) and the second structure (2).

Description

Mounting kit for a filter element

[0001] The present invention relates to a mounting assembly for a filter element intended to be inserted into a tank, particularly a tank containing urea. The invention also relates to a fluid supply unit comprising such a filter element, which can be removably mounted within a tank using a deformable mounting.

[0002] Generally speaking, a fluid supply unit from a reservoir to a consumption device is a system that transfers a fluid, such as an aqueous solution, fuel, or gas, from a storage tank to a point of use or consuming device. This type of system may include several components, such as tanks, pumps to provide the necessary pressure and flow rate, lines to transport the fluid, valves to control the flow, and sensors to monitor and regulate the distribution process. The main objective of such a system is to ensure a controlled supply of fluid that meets the specific needs of the consuming device, while also ensuring safety and operational efficiency.

[0003] In order to sustainably reduce pollutant emissions, particularly from motor vehicles, the Selective Catalytic Reduction (SCR) process is now used. This process helps reduce nitrogen oxide emissions, especially from diesel vehicles. The ammonia required for the SCR process is not used directly, i.e., in its pure form, but generally as an aqueous urea solution. This urea solution produces ammonia and carbon dioxide through a hydrolysis reaction. The ammonia produced can then react with the nitrogen oxides present in the exhaust gases of an SCR catalytic converter at a suitable temperature. Nitrogen oxides, such as nitrogen monoxide and nitrogen dioxide, are among the best-known pollutants commonly grouped under the term NO₂. xSince the urea solution contains water for dilution, at low temperatures there is a risk that the aqueous urea solution may freeze in the designated reservoir, which could interfere with the proper circulation of the aqueous solution. This would impede the SCR reaction necessary for NO reduction. x can no longer take place. For reliable operation and compliance with legal emission standards, it is necessary that the urea solution be reliably protected against freezing.

[0004] It is known that filtering devices for filtering aqueous urea solutions are generally also provided in urea tanks and that these can tend to clog at low temperatures. Examples of such filtering devices are known, notably from documents US9874131 B2 and KR20180109251 A. The optimal operation of such filtering devices must also be considered over a wide range of ambient temperatures.

[0005] Another issue is the presence of contaminating particles in the aqueous solution, which can contaminate the urea fluid. Contaminating particles in a urea tank can originate from various sources and have diverse impacts on system operation. Examples of such contaminating particles include: dust and dirt particles that may come from the external environment and enter during filling; production residues, which can be metallic or plastic particles from the manufacturing and assembly of urea tanks and dispensing systems; organic debris, which can be plant fragments or insects that may settle in the tank; chemical impurities, which can be chemical contaminants present in the urea itself, including traces of heavy metals or other undesirable chemical compounds; and urea crystals.which may result from crystal formation due to faulty temperature management or irregular concentrations in the urea solution; microorganisms, which may be bacteria or molds that can grow in humid and non-sterile conditions; corrosion debris, which may be metallic particles from internal corrosion of the tank or distribution lines; and packing debris, which may be particles resulting from wear of seals, pumps, or other components of the SCR system.

[0006] Contaminating particles can clog the injectors, thus reducing the efficiency of urea injection and compromising NO reduction. xAbrasive contaminants can accelerate wear on pumps, injectors, and other SCR system components. Chemical impurities can cause unwanted reactions, reducing the efficiency of the urea solution and damaging the catalyst. Contaminants can accumulate on the catalyst, decreasing its active surface area and efficiency. Contaminants can lead to the formation of solid deposits in the tank and lines, disrupting the urea flow.

[0007] To avoid these problems, installing a filtration system is beneficial for removing contaminating particles by retaining solid particles and protecting the SCR system. It also extends component life by reducing wear on injectors and pumps by preventing blockages and abrasion, and ensures optimal urea injection by maintaining a constant and clean flow of urea to the catalyst for effective NOx reduction. x , prevent deposits and corrosion by reducing the formation of solid deposits and internal corrosion through adequate filtration, improve the overall efficiency of the system by ensuring stable and durable performance of the SCR system by minimizing the risks of contamination, decrease the risk of SCR system failures, reducing the availability and reliability of vehicles or machines.

[0008] To prevent these problems, the invention relates in particular to a fixing assembly for a filter.

[0009] In some systems, a filter can be identified within the reservoir, between the fluid pump and the piping. However, the issue of easy access to the filter for replacement arises. Document US2016123929A1 describes a module located within a reservoir, which may include a pump and a filter to filter the solution entering the supply line. However, document US2016123929A1 remains silent on the possibility of providing a large filter surface area to prevent clogging and on the ease of filter replacement.

[0010] The invention aims, in particular, to overcome these drawbacks of the prior art. More specifically, an objective of the invention, in at least one of its embodiments, is to provide a fastening assembly for a filter element and a unit for supplying a fluid from a reservoir to a device for consuming said fluid.

[0011] Another objective of the invention, in at least one of its embodiments, is to implement a tank for such a unit. The invention, in at least one of its embodiments, also aims at a vehicle comprising such a tank.

[0012] The invention relates to a fixing assembly for a filter element comprising: a first structure having a generally cylindrical shape along a longitudinal axis, a wall arranged to close a longitudinal end of the first structure, the wall and / or the first structure having at least one first opening, the wall comprising at least one first protrusion directed towards the interior of the first structure, said at least one first protrusion comprising at least one slot, said at least one first protrusion being located at a first distance d1 from the longitudinal axis, a second structure having a generally cylindrical shape along the longitudinal axis and comprising at least one second opening, a longitudinal end of the second structure comprising along the longitudinal axis at least one depression and at least one projection located at a distance d2 from the longitudinal axis, the at least one projection comprising a slot,the distance d2 being greater than the distance d1, the first structure engaging at least partially with the second structure along the longitudinal axis on the side of the longitudinal end bearing said at least one depression and at least one projection, said at least one second lumen being configured to be in fluidic connection with said at least one first lumen in the presence of a liquid, a deformable fastening means having a shape wrapping at least partially around the longitudinal axis, the deformable fastening means being reversibly deformable and comprising at least one first projecting zone directed towards the longitudinal axis and at least one second projecting zone extending away from the longitudinal axis, the fastening assembly being configurable according to at least two configurations:,

[0013] - a first configuration in which said at least first protruding zone of the deformable fastening means is arranged inserted within said at least a slot of said at least a first protrusion of the first structure, said at least a depression of the second structure forming a stop along the longitudinal axis for said at least a second protruding zone of the deformable fastening means,

[0014] - a second configuration, after rotation around the longitudinal axis of the first structure relative to the second structure from the start of the first configuration, the second configuration being such that said at least a second protruding area of ​​the deformable fastening means is inserted within the slot of at least one protrusion of the second structure, said at least a first protruding area of ​​the deformable fastening means remaining inserted within said at least one slot of said at least a first protrusion of the first structure.

[0015] Generally speaking, when referring to a cylindrical shape, this refers to a tubular shape, similar to that of a tube.

[0016] Reinforcing ribs or edges can be added to the first structure to increase its mechanical strength.

[0017] The term slit refers to a through opening that can have either an open or closed contour.

[0018] In one example of an embodiment, the distances d1 and d2 can be represented as radii with respect to the longitudinal axis.

[0019] The assembly consisting of the wall and the first structure is subsequently referred to as the movable sub-assembly.

[0020] The design of the mounting assembly, featuring a wall at one circular end of the first cylindrical structure, is chosen to provide stability and structural support. This wall, in full contact with the circular end of the first cylindrical structure, offers a solid and stable bearing surface, ensuring a uniform distribution of forces, vibrations, and pressures exerted by the fluid. This configuration contributes to the overall rigidity of the moving subassembly, minimizing unwanted deformations and vibrations that could affect the proper functioning of the mounting assembly. The interaction between the wall and the first structure creates a sealed moving subassembly, preventing fluid leakage and ensuring that all the fluid passes through the fluid connection as intended.Adding seals or gaskets between the wall and the primary structure can further improve the watertightness and safety of the wall-primary structure assembly, especially when they are designed and joined separately. The wall and primary structure can be manufactured separately and joined together, or preferably, the wall and primary structure can be manufactured as a single, integrated unit. If manufactured separately, the wall can be screwed onto the primary structure using a threaded connection, ensuring a robust and watertight bond. Alternatively, a bayonet fitting can be used, where the wall snaps onto the primary structure with a twist, allowing for quick and secure assembly. Quick-release clips or latches, such as metal or plastic clips, can be used to rapidly attach the wall to the primary structure, facilitating maintenance.

[0021] Various materials can be used to fabricate the primary structure, secondary structure, and wall, including stainless steel, aluminum, polypropylene (PP), nylon, fiberglass, and carbon fiber, each offering specific advantages in terms of strength, lightness, and durability. Surface treatments, such as anodizing or anti-corrosion coatings, can be applied to enhance durability and resistance to harsh environmental conditions. A variety of manufacturing methods, such as injection molding, machining, welding, and 3D printing, can be employed to produce parts with complex shapes and tight tolerances.

[0022] A first light on the wall and / or said first structure is understood to be a light located on the lateral perimeter of the first structure and / or the wall. In other words, a first light is understood to be a light within the moving subassembly.

[0023] A second light on the second structure refers to a light located on the lateral perimeter of the second structure. However, a second light can also be part of the opening at a circular end of the second structure.

[0024] Light sources are defined as openings that can be slots or round, polygonal, or elongated openings allowing the flow of a fluid. Light sources can also be small circular holes evenly distributed across the surface of the primary structure to ensure homogeneous fluid distribution. A grid structure integrated into the primary structure can serve as light sources, providing a large open area for fluid passage while also offering structural support. According to this definition, a light source can also be part of the opening at a circular end of a structure.

[0025] According to the invention, said at least one first light is in fluidic connection with said at least one second light. Thus, liquid fluid communication is ensured between the exterior of the moving subassembly and the interior of the volume defined by the second structure, regardless of the nature of said liquid fluid. In a preferred embodiment, this communication can also be achieved by creating a space between an interior surface of the first structure and an exterior surface of the second structure. This is particularly useful when said at least one first light is not directly opposite said at least one second light.

[0026] According to the invention, the fastening assembly also includes a deformable fastening means configured to wrap at least partially around the longitudinal axis. This deformable fastening means is designed to undergo reversible deformation during assembly. Thus, it can adopt a simple shape and be easily installed by temporarily deforming to adjust. Furthermore, the means's natural tendency to return to its initial shape exerts continuous pressure on the parts with which it is in contact, thereby ensuring stable and secure retention. In addition, said means is configured to control longitudinal and radial movement between said second structure and said first structure.

[0027] The fastening means preferably has a center in at least one plane substantially perpendicular to the longitudinal axis. By center, we mean the axis if the cross-section of the fastening means is circular, or the central area of ​​the cross-section if the fastening means has a cross-section other than circular, such as polygonal. According to this preference, the fastening means has a generally planar configuration. This simple design reduces manufacturing costs and increases reliability.

[0028] Using a fastening device such as a circlip allows for precise control of the longitudinal movement between the second and first structures. This prevents any unwanted axial displacement, ensuring that the components of the fastening assembly remain securely in place under pressure and fluid flow, while still allowing relative movement between the parts. This accommodates stresses arising from various phenomena, such as the expansion of parts due to temperature variations or ambient vibrations, particularly in vehicle applications. A circlip can be made from round, triangular, square, or polygonal wire and may have a gap between its ends. These ends can point towards each other or be bent to align them parallel to one another.If significant flexibility is required, they can be arranged with a space between them. If more rigidity is required, these ends can be joined together.

[0029] The fixing device is positioned near the wall. This allows for a connection to a portion of the second structure located away from a base, simplifying modifications to an existing second structure, such as a standard ADM (Automatic Distribution Module) from the applicant. It also frees up a cylindrical contact area near the base, where a seal can be created between the outer surface of the second structure and the inner surface of the first.

[0030] The assembly consisting of the second structure and a base is hereafter referred to as the fixed sub-assembly. The connection between the second structure and the base can be made in a similar way, mutandis mutatis, to that of the movable sub-assembly, between the wall and the first structure.

[0031] As a non-limiting example, the second structure can be an integral part of the ADM, which can be removably mounted in the lower part of the tank, notably using screws and a gasket for sealing. The configuration of this movable sub-assembly simplifies assembly and disassembly, facilitating access to the device for maintenance, cleaning, or replacement. This allows for non-destructive, removable assembly and disassembly. This modular design enables precise alignment of the components, reducing the risk of assembly errors and improving maintainability.

[0032] The fastening means is entirely contained within a space defined by an outer surface of the primary structure. Confining the elastic means entirely within this space eliminates the need for a gap between the interior and exterior of the primary structure. This results in a primary structure with a simple design and shape, avoids the need for additional sealing between the interior and exterior of the moving sub-assembly, and eliminates the need for special tools for assembly and disassembly. The fastening means allows for quick and efficient installation, simplifying maintenance and component replacements within the fastening system.

[0033] According to the invention, the fastening means comprises protruding areas. These protruding shapes firmly grip the edges of the components by penetrating slots. This reinforces the stability and integrity of the assembly, preventing any unwanted movement that could compromise the sealing or proper alignment of the parts.

[0034] The optimized and simplified design of the fastening means and protruding areas allows easy access for inspection and maintenance, reducing downtime and service costs.

[0035] The fastening device can be manufactured from various materials, making it adaptable to different service conditions and types of liquid fluids. Its shape and design meet common industry standards, ensuring compatibility with a wide range of applications and fluid supply unit configurations.

[0036] The fastener can be manufactured using any method available to those skilled in the art, such as laser cutting, a method used for the precise production of circlips and elastic fasteners. This method offers high precision and reproducibility. Stamping is a common manufacturing process for metal components, allowing for mass production with complex shapes and well-defined protruding areas. Injection molding can be used for plastics or composite materials. This process allows for the production of complex shapes with precise tolerances. Alternatively, the fastener can be manufactured by extrusion.

[0037] Spring steel is a commonly used material for fasteners due to its high resistance to elastic deformation and durability; it can withstand repeated loading and unloading cycles without losing its elastic properties. Stainless steel offers excellent corrosion resistance and is ideal for applications where the fluid may be aggressive or where harsh environmental conditions are present. Engineering plastics, such as nylon or polyetheretherketone (PEEK), can be used for circlips in applications requiring high chemical resistance and low electrical conductivity. Fiberglass or carbon fiber composites can be used to produce lightweight, high-strength circlips suitable for high-performance applications.

[0038] The choices of shapes, manufacturing methods and materials listed above make it possible to create effective, durable and easy-to-use fastening means, meeting the specific requirements of the fastening assembly.

[0039] According to the invention, the fixing means can be precisely positioned thanks to its assembly by penetrating with its first protruding areas the slots of the protuberances of the wall and with the second protruding areas penetrating the slots of the second structure to achieve the assembly of the two sets described above.

[0040] According to one embodiment, the wall further comprises at least two second protrusions, said at least two second protrusions being arranged towards the interior of said first structure, a number of three second slots arranged equidistantly, a number of three first slots arranged equidistantly, three second protruding areas being framed each by two of the at least one second protrusion.

[0041] In an assembly mode of the moving sub-assembly on the fixed sub-assembly, the wall is located opposite the base. In other words, the filter, the first structure, and the second structure are arranged to form a sandwich between the base on one side and the wall on the other.

[0042] Thus, this embodiment makes it easier to assemble in that an operator or a robotic arm can assemble the mobile sub-assembly onto the fixed sub-assembly according to the following steps: present the mobile sub-assembly coaxially with respect to the fixed sub-assembly, slide the first structure onto the second structure along its axis until it stops, rotate the first structure in an axial rotational movement, which compresses the protruding parts until the protruding parts have taken their place by entering the slots of the second structure.To carry out the disassembly, the following steps can be followed: rotate the first structure, which compresses the protruding parts by pushing them out of the slots of the second structure until they can relax again when they are no longer in contact with the protrusions that compress them, then slide the first structure along its longitudinal axis along the entire length of the second structure.

[0043] In one embodiment, the mounting assembly for a filter element further comprises at least one third protrusion having a contact surface configured to control the positioning of said deformable mounting means along the longitudinal axis. This stabilizes the movement of the elastic mounting means, thereby further improving the reliability of the assembly and the control of relative movements between the first and second structures, i.e., between the static and moving sub-assemblies.

[0044] In one embodiment, the at least first protruding zone and the at least second protruding zone are arranged on at least two planes, with a non-zero distance between said two planes along the longitudinal axis (L). This allows the length of the elastic fastening means between the protruding parts entering the slots of the second structure and the protruding parts entering the slots fixed to the first structure to be increased, thereby enabling a greater relative movement between the first and second structures. This also allows for the creation of ends that can be grasped with a tool.

[0045] In one embodiment, the at least one first opening represents a total surface area greater than 80% of the surface area of ​​the first structure, for example, a range of 80% to 95%. Increasing this percentage increases the surface area through which the fluid to be filtered can pass, thereby optimizing the filter's effective surface area and reducing the frequency of filter replacement. However, the ratio between the required mechanical strength and the necessary fluid space can be adjusted to meet all implementation requirements. For example, the at least one opening can represent a very small total surface area, namely within a range of 10% to 40% or 10% to 70%, when the required fluid flow rate is very limited.

[0046] In one embodiment, the at least first protruding zone and the at least second protruding zone each comprise at least one V, W, and / or U-shaped zone. This optimizes the progression with which a rotational torque is applied to the first structure during assembly and disassembly, thereby improving the reliability of the assembly and disassembly process. Furthermore, this also improves the reliability of the anchoring of the protruding zones once the first structure is assembled, thus enhancing their resistance to vibrations and / or movements due to low temperatures.

[0047] In one embodiment, the mechanism further includes a guide arranged to facilitate assembly, said guide being of a visual and / or tactile type, comprising two parts, one arranged on the wall and the other on a base. Alternatively, this other part of the guide can be placed on the second structure. Generally, one part of the guide is placed on the moving subassembly and the other part somewhere on the fixed subassembly. This facilitates and improves the reliability of assembly and disassembly by aligning the two parts of the guide. This alignment can be performed visually or blindly by an operator, simply by recognizing the shapes by touch. When the moving subassembly is correctly mounted on the fixed subassembly, the two guides are aligned. This confirms that the assembly has been correctly performed.The same reasoning applies, mutatis mutandis, in the case of a robotic assembly.

[0048] In a non-limiting example, where the second structure has three slots, the wall may have three markers spaced 120° apart. Alternatively, two markers may be placed at 180°, or four markers at 90°, or even more markers, preferably corresponding to the number of slots into which the slots of the second structure pass.

[0049] In one embodiment, a fastening assembly for a filter element comprises a deformable fastening means which further comprises at least one portion in a plane substantially perpendicular to the longitudinal axis L, said portion being guided by at least one fourth protrusion, said at least one fourth protrusion being arranged perpendicularly on said wall towards the interior of said first structure. Thus, the guidance of the elastic fastening means can be further optimized, thereby optimizing the assembly and disassembly steps, as well as the control of relative movements between the first and second structures. This at least one fourth protrusion limits the rotation and deformation of the elastic fastening means, which has the advantage of preventing it from escaping its housing, particularly during assembly when significant forces are applied to it.

[0050] In one embodiment, the second structure comprises two parts, including a removable extension that includes at least one recess and at least one projection. In other words, the second structure can be composed of two parts that can be joined modularly. Thus, the mounting assembly can be adapted to an existing ADM (Automatic Device Module). An existing ADM generally includes a circular flange, which can be considered one of the two parts of the second structure, onto which the extension is mounted, either removably or permanently, depending on the application requirements. In this case, the fixed sub-assembly also includes the ADM flange. The two cooperating parts can be assembled using any suitable technique, such as adhesive, laser welding, circlips, etc.

[0051] In one embodiment, a filtration assembly comprises a mounting system for a filter element as described above and a filter positioned over at least one first light. In other words, the filter element is configured to cover at least one first light. This results in a filtration assembly. In this embodiment, a filter element is a filter that can be screwed, glued, overmolded, or assembled in any other way, ensuring a solid and airtight connection to the first structure. The filter may cover the entire surface of the first structure, or there may be uncovered areas. This embodiment optimizes the use of the filter material, primarily at the location of the light(s).

[0052] A filter is a device used in fluid supply systems to retain and remove contaminating particles. It acts as a barrier that allows clean fluid to pass through while blocking harmful or unwanted elements. Filters are useful for maintaining fluid purity, protecting downstream equipment from wear or damage, and ensuring the proper functioning and longevity of fluid distribution systems.

[0053] A cylindrical filter is characterized by its cylindrical structure, usually consisting of a filter material wound or arranged around a central core.To characterize such a filter, several aspects can be taken into account, such as: the inner and outer diameter as well as the length of the cylinder are useful measurements to define the size of the filter; the type of material used for filtration, for example, paper, synthetic fiber, sintered metal, determines the ability of the filter to capture different sizes of particles; the pore size of the filter material, often expressed in microns, indicates the fineness of the filtration and the types of particles that the filter can retain; the capacity of the filter to allow the passage of fluid, often measured in liters per minute (L / min), in order to ensure that it meets the requirements of the system; the maximum pressure at which the filter can operate safely without deforming or deteriorating; the ability of the filter material to withstand the specific fluids that it is intended to filter without degrading.

[0054] In one embodiment, the filter, the first structure, and the second structure are assembled coaxially, ensuring stability and structural support. The interactions between the components, particularly between the wall, the first structure, and the second structure, are important for creating a relatively sealed environment. This prevents fluid leakage and ensures that all the fluid passes through the filter. The coaxially mounted components can be easily assembled and disassembled in a modular fashion, simplifying filter maintenance, cleaning, and replacements. This modularity reduces downtime and facilitates maintenance interventions. The coaxial arrangement of the elements ensures precise alignment, minimizing the risk of assembly errors and improving system efficiency.Thus, we obtain a configuration allowing easy and robust assembly between two sets, as follows: a mobile subset comprising the wall, the first structure, the elastic fixing means and the filter; a static subset comprising the second structure and the base.

[0055] The entire assembly—wall, primary structure, and possibly a filter—can also be manufactured as a single unit, which can reduce the overall manufacturing cost. In this case, the moving subassembly comprises the wall, the primary structure, and a filter.

[0056] In one embodiment, the filtration assembly further comprises a module with a pump arranged in contact with a base, said module being arranged within a space delimited by an internal surface of said second structure, said module preferably also comprising an additional filter and / or at least one sensor and / or a control unit. Thus, a fixed subassembly comprising the second structure, the base, and the pump module can be provided. This static subassembly can be easily mounted in a tank while ensuring a seal between the disc shape of the base and a tank wall. The static subassembly comprising the base and the second structure can also be manufactured entirely as a single piece, which can reduce manufacturing costs.Therefore, a typical ADM assembly, which includes common parts such as a filter mounted near the pump and optional elements such as sensors and a control unit for the pump and / or sensors, can easily be transformed and equipped into a static sub-assembly according to this embodiment.

[0057] Preferably, said base may have a general disk shape having a surface substantially perpendicular to the longitudinal axis.

[0058] In one embodiment, the assembly further comprises a sealing means arranged between said second structure and said first structure, said sealing means being configured to ensure sealing in a situation where there is longitudinal and / or circular movement between said second structure and said first structure, said sealing means being arranged near an end of said second structure that is distant from said wall. Thus, sealing can be optimized while allowing relative movement between the static subassembly and the moving subassembly, which can be useful for assembly / disassembly steps as well as for allowing relative movement in situations of vibration and low temperatures. The sealing means can preferably be an O-ring.A reliable seal, such as an O-ring, prevents leaks that could lead to malfunctions or safety hazards in the system. Alternatively, other sealing methods can be used, such as an O-ring, an X-ring, foam, or an elastomer overmolding. This longitudinal and / or circular movement can be described as a sliding pivot between the moving and stationary subassemblies.

[0059] The invention also relates to a tank comprising a mounting assembly according to one of the preceding embodiments, configured for installation in a vehicle, and in which said fluid comprises an aqueous solution including urea. Thus, the invention is based on a completely new and inventive approach to tanks that equip vehicles fitted with an SCR system.

[0060] The invention also relates to a vehicle comprising a tank as described above. 5. List of figures

[0061] Other features and advantages of the invention will become more apparent upon reading the following description of a preferred embodiment, given by way of simple illustrative and non-limiting example, and the accompanying drawings,including: illustrating the constituent elements according to an embodiment of the invention; illustrating a detail according to an embodiment of the first structure; illustrating a detail according to an embodiment of the second structure; illustrating a detail according to an embodiment of the elastic element; illustrating a detail according to an embodiment of the elastic element; illustrating the constituent elements according to an embodiment of the invention; illustrating the constituent elements according to an embodiment of the invention; illustrating the constituent elements according to an embodiment of the invention; illustrating the constituent elements according to an embodiment of the invention; illustrating the constituent elements according to an embodiment of the invention.

[0062] 6. Description of at least one embodiment of the invention

[0063] The embodiments described below are not exhaustive; variants of the invention may include only a selection of the described features, hereinafter isolated from the other described features, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art. This selection includes at least one feature, preferably functional, without structural details, or with only a portion of the structural details if this portion alone is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

[0064] In connection with the, an embodiment of the unit for supplying a fluid from a reservoir to a device for consuming said fluid is presented, said supply unit comprising a filter (14), visible in detail in, of a generally cylindrical shape along a longitudinal axis (L), a first structure (3) of a generally cylindrical shape along the longitudinal axis (L) and comprising at least one first opening (15), the filter (14) being configured to be arranged in contact with and on at least a part of an external surface of the first structure (3), a wall (5) having a generally disc shape, arranged substantially perpendicular to the longitudinal axis (L) and connected to a circular end of said general cylindrical shape of the first structure (3), a second structure (2) having a generally cylindrical shape substantially along the longitudinal axis (L) and comprising at least one second opening (16),a radial end of said second structure (2) being arranged connected to a base (1), said filter (14), the first structure (3), said second structure (2) being arranged coaxially to each other, an elastic fastening means (7) having a generally circular shape circumscribed in at least one plane substantially perpendicular to the longitudinal axis (L). In Figures 2 and 3, the axis along which the first structure and the second structure are concentrically fitted can be seen. The filter (14) mounted on the first structure (3) can also be seen in Figure 3.

[0065] The illustration shows, in exploded mode, the elastic fixing means (7), the protruding areas (17, 17'), the wall (5), the first structure (3) and the second structure (2), said at least a second light (16) which is in fluidic connection with said at least a first light (15).

[0066] The first structure (3) and the wall (5) of which further comprise at least one first protrusion (6) arranged substantially perpendicular to a surface of said wall (5), said at least one first protrusion (6) comprising at least one first slot (10), at least one second protrusion (12) arranged substantially perpendicular to a surface of said wall (5) and configured to guide said elastic fastening means (7), said at least one first protrusion (6) and said at least one second protrusion (12) being arranged within a space delimited by an external surface of the first structure (3).

[0067] Figure 1 illustrates the second structure (2) mentioned above. The second structure (2) has three second slots (8), said three second slots (8) being arranged near an end far from said base (1), which is visible at the top of Figure 1. On Figure 2, one can see that the second structure (2) has three protrusions (9), like ears in the upper part, towards an end of the second structure (2) far from the base (1). These protrusions (9) allow sufficient material to be placed around the second slots (8). The three second slots (8) have a straight opening, approximately at the same height as the end of the second structure (2) far from the base (1). This end is in fact a contact area for positioning the elastic fastening means (7) when the movable subassembly, namely the first structure (3) which includes the wall (5), the elastic fastening means (7), and the filter (14), is placed on top.When the movable subassembly is rotated while in position with the elastic fastening means (7) in contact with its end, the protruding areas (17') are compressed by contact with the projections (9). As the movable subassembly continues to rotate, the protruding areas (17') of the elastic fastening means (7) will penetrate the second slots (8).

[0068] Figures 2 and 3 show a number of three first protrusions (6) arranged equidistant from each other on a circle located at a distance D from a periphery of said wall (5) and said at least one second protrusion (12) is located at a distance less than the distance D from a periphery of said wall (5), said elastic fastening means (7) preferably comprising three projecting zones (17') in the direction of a periphery of said wall (5), each being framed by two of the at least one second protrusion (12) and penetrating said at least two second slots (8) and three projecting zones (17) in the direction of the center of said wall (5) and penetrating said at least one first slot (10).

[0069] According to an alternative, the protruding areas (17), which penetrate said at least a first slot (10), can also be oriented towards a periphery of said wall (5), as visible on the.

[0070] The illustration shows said base (1), which has a general disk shape with a surface substantially perpendicular to the longitudinal axis (L), a module (13) comprising a pump being arranged in contact with said base (1), said module (13) being arranged within a space delimited by said second structure (2). However, the pump is not visible because it is located within the volume defined by the second structure (2). A sealing means (4) is arranged between said second structure (2) and said first structure (3), said sealing means (4) being configured to ensure sealing in a situation in which there is longitudinal and circular movement between said second structure (2) and said first structure (3), said sealing means (4) being arranged near an end of said first structure (3) away from said wall (5).

[0071] Figure 1 illustrates the mechanism, which further comprises at least one third protrusion (11) arranged perpendicular to a surface of the wall (5) and having a contact surface configured to control the positioning of said elastic fastening means (7) along the longitudinal axis (L). This protrusion preferably has a flat surface surrounded by two projections, as illustrated in Figure 1, on which a projecting area (17) is positioned. This allows the elastic fastening means to be precisely positioned in the plane perpendicular to the longitudinal axis (L).

[0072] Figures 2 and 3 also illustrate a marker (18) arranged to facilitate assembly, said marker (18) being of the visual and / or tactile type, comprising two parts, one of which is arranged on said wall (5) and another is arranged on said base (1).

[0073] Figures 4 and 5 illustrate the elastic fastening means (7). The elastic fastening means (7) has projecting areas (17, 17') arranged on at least two planes, with a non-zero distance between said two planes along the longitudinal axis (L). This is visible in Figure 1, which shows an elastic fastening means (7) on two planes, while Figure 2 represents an elastic fastening means (7) whose development is only in one plane. Figure 3 also represents an elastic fastening means (7) arranged on two planes with projecting areas (17, 17') that include at least one V-shaped or U-shaped area.

[0074] Figure 1 illustrates the second structure and the first structure in an assembled mode. More particularly, it shows the aforementioned projecting zones (17, 17') which are configured to fit in a staggered and alternating manner into said at least one first slot (10) and respectively into said at least two second slots (8). The space between the second structure and the first structure is also visible on Figure 1.

[0075] On the figure, we find the said elastic fastening means (7), which further comprises at least one portion in a plane substantially perpendicular to the longitudinal axis (L), said portion being arranged and guided by at least one fourth protrusion (19). In this figure, we can see a configuration with six of these fourth protrusions (19), not all of which are visible. In this figure, we can also distinguish a space between the first structure (3) and the second structure (2), which allows for the fluidic connection with said at least one first lumen (15) and said at least one second lumen (16). The projecting areas (17), which penetrate said at least one first slot (10), can also be oriented, according to an alternative embodiment, towards a periphery of said wall (5), as shown in the figure. In this case, said fourth protrusions (19) allow for the precise positioning of said elastic fastening means (7).

[0076] The illustration shows, on the left, an extension (30), generally cylindrical in shape, which has three second slots (8) and attachment tabs on one part of said second structure (2). On the right, the extension (30) is shown mounted on the other part of said second structure (2). According to this embodiment, the extension (30) can be seen as forming an integral part of said second structure (2).

[0077] Figure 1 illustrates another possible way to create the first lights (15), in the form of smaller and larger triangles and circles, so as to avoid mass concentrations in the first structure (3). For visibility reasons, the wall (5) has been omitted so as to better see the interfaces between the second prominences (12), three protruding zones (17') penetrating the three second slits (8) and three protruding zones (17) arranged oriented towards the center of the cylindrical structures, each protruding zone (17) arranged penetrating three first slits (10).

[0078] Figure 1 illustrates the distance d1, at which the said at least one first protrusion (6) is located relative to the longitudinal axis (L), and the distance d2, at which the said at least one depression (9') and at least one projection (9) are located relative to the longitudinal axis (L). As can be seen in Figure 2, the said at least one depression (9') and at least one projection (9) lie on the same circle, which has the longitudinal axis (L) as its center. For this reason, the distances d1 and d2 can be represented as radii relative to the longitudinal axis. Figure 3 shows that the distance d2 is greater than the distance d1.

[0079] It is observed that the first three protruding areas (17) of the deformable fastening means (7), which are directed towards the longitudinal axis L, are inserted within three slots (10) of said at least one first protrusion (6) of the first structure (3).

[0080] It is also noted that the three second projecting zones (17') of the deformable fastening means (7), extending away from the longitudinal axis (L), are inserted within three slots (8) of at least one projection (9) of the second structure (2). Of course, the invention is not limited to the embodiments mentioned above. In particular, those skilled in the art may make any variation in the materials, manufacturing methods, dimensions, and choice of fluid.

[0081] As is self-evident, the invention is not limited to the embodiments described above by way of non-limiting example; on the contrary, it encompasses all variations of the invention. Of course, the invention is not limited to the examples just described, and numerous modifications can be made to these examples without departing from the scope of the invention. Furthermore, the various features, forms, variations, and embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive.

Claims

A fixing assembly for a filter element characterized in that the fixing assembly comprises: a first structure (3) having a general cylindrical shape along a longitudinal axis (L), a wall (5) arranged to close a longitudinal end of the first structure (3), the wall (5) and / or the first structure (3) having at least one first aperture (15), the wall (5) having at least one first protrusion (6) directed towards the interior of the first structure (3), said at least one first protrusion (6) having at least one slot (10), said at least one first protrusion (6) being located at a first distance d1 from the longitudinal axis (L), a second structure (2) having a general cylindrical shape along the longitudinal axis (L) and having at least one second aperture (16),a longitudinal end of the second structure (2) comprising along the longitudinal axis (L) at least one depression (9') and at least one projection (9) located at a distance d2 from the longitudinal axis (L), the at least one projection (9) comprising a slot (8), the distance d2 being greater than the distance d1, the first structure (3) engaging at least partially on the second structure (2) along the longitudinal axis (L) on the side of the longitudinal end bearing said at least one depression (9') and the at least one projection (9), said at least one second light (16) being configured to be in fluidic connection with said at least one first light (15) in the presence of a liquid, characterized in that the assembly further comprises: a deformable fastening means (7) having a shape wrapping at least partially around the longitudinal axis (L),the deformable fastening means (7) capable of reversibly deforming and comprising at least a first protruding zone (17) directed towards the longitudinal axis L and at least a second protruding zone (17') extending away from the longitudinal axis (L), the fastening assembly being configurable according to at least two configurations: - a first configuration in which said at least first protruding zone (17) of the deformable fastening means (7) is inserted within said at least one slot (10) of said at least one first protrusion (6) of the first structure (3), said at least one depression (9') of the second structure (2) forming a stop along the longitudinal axis (L) for said at least second protruding zone (17') of the deformable fastening means (7), - a second configuration, after rotation around the longitudinal axis (L) of the first structure (3) relative to the second structure (2) from the first configuration,the second configuration being such that said at least a second protruding zone (17') of the deformable fastening means (7) is inserted within the slot (8) of at least one protrusion (9) of the second structure (2), said at least a first protruding zone (17) of the deformable fastening means (7) remaining inserted within said at least one slot (10) of said at least a first protrusion (6) of the first structure (3). A fixing assembly for a filter element according to the preceding claim, the wall (5) further comprising at least two second protrusions (12), said at least two second protrusions (12) being arranged towards the interior of said first structure (3), a number of three second slots (8) arranged equidistantly, a number of three first slots (10) arranged equidistantly, three second protruding areas (17') each framed by two of the at least one second protrusion (12). Fixing assembly for a filter element according to one of the preceding claims, further comprising at least one third protrusion (11) having a contact surface configured to control the positioning of said deformable fixing means (7) along the longitudinal axis (L). Fixing assembly for a filter element according to any one of the preceding claims, wherein said at least first protruding zone (17) and said at least second protruding zone (17') are arranged on at least two planes, with a non-zero distance between said two planes along the longitudinal axis (L). Fixing assembly for a filter element according to any one of the preceding claims, wherein said at least one first light (15) represents a total area greater than 80% of the area of ​​said first structure (3). Fixing assembly for a filter element according to any one of the preceding claims, wherein said at least first protruding zone (17) and said at least second protruding zone (17') comprise at least one V, W and / or U-shaped zone. Fixing assembly for a filter element according to any one of the preceding claims, further comprising a marker (18) arranged to facilitate mounting, said marker (18) being of the visual and / or tactile type, comprising two parts, one of which is arranged on said wall (5) and another is arranged on a base (1) or on said second structure (2). A fixing assembly for a filter element according to any one of the preceding claims, wherein said deformable fixing means (7) further comprises at least one part in a plane substantially perpendicular to the longitudinal axis (L), said part being guided by at least one fourth protrusion (19), said at least one fourth protrusion (19) being arranged perpendicularly on said wall (5) towards the interior of said first structure (3). A fixing assembly for a filter element according to any one of the preceding claims, wherein said second structure (2) is composed of two parts including a removable extension (30) which includes said at least one depression (9') and said at least one projection (9). Filtration assembly comprising the fixing assembly for a filter element according to any one of the preceding claims and a filter (14) disposed in front of said at least a first light (15). Filtration assembly according to the preceding claim further comprising a module (13) comprising a pump being arranged in contact with a base (1), said module (13) being arranged inside a space delimited by an internal surface of said second structure (2), said module (13) preferably further comprising an additional filter and / or at least one sensor and / or a control unit. A filtration assembly according to any one of claims 10 or 11, further comprising a sealing means (4) arranged between said second structure (2) and said first structure (3), said sealing means (4) being configured to ensure sealing in a situation in which there is longitudinal and circular movement between said second structure (2) and said first structure (3), said sealing means (4) being arranged near an end of said second structure (2) away from said wall (5). Tank comprising a filtration assembly according to any one of claims 10, 11 or 12, configured to be mounted in a vehicle and in which said liquid comprises an aqueous solution including urea. Vehicle comprising a tank according to the preceding claim.

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