WO2012153202A1 - Unité de filtration de fluide - Google Patents

Unité de filtration de fluide Download PDF

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Publication number
WO2012153202A1
WO2012153202A1 PCT/IB2012/050934 IB2012050934W WO2012153202A1 WO 2012153202 A1 WO2012153202 A1 WO 2012153202A1 IB 2012050934 W IB2012050934 W IB 2012050934W WO 2012153202 A1 WO2012153202 A1 WO 2012153202A1
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WO
WIPO (PCT)
Prior art keywords
filter member
filtration
fluid
filtration unit
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2012/050934
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English (en)
Inventor
Franck Couty
Isabelle Chantome
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Filtertek Inc
Original Assignee
Filtertek Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Filtertek Inc filed Critical Filtertek Inc
Publication of WO2012153202A1 publication Critical patent/WO2012153202A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
    • B01D35/0273—Filtering elements with a horizontal or inclined rotation or symmetry axis submerged in tanks or reservoirs

Definitions

  • the invention relates to filtration units for fluids, in particular liquid additives for motor vehicle exhaust systems.
  • the invention also relates to systems provided with such fluid filtration units, and groups of filtration units provided with such fluid filtration units.
  • catalytic converters also called catalysers.
  • the latter are configured to reduce by catalysis the unburned pollutant exhaust gases, typically carbon monoxide, hydrocarbons and nitrogen oxide.
  • the higher the combustion temperature the more the formation of nitrogen oxide is promoted.
  • Catalytic converters help to degrade a major part of the pollutant gases but, because of changes in pollution control standards "EURO", there is a risk that they will no longer be sufficient.
  • SCR selective catalytic reduction
  • NOx nitrogen oxide
  • This fluid additive is an aqueous solution of synthetic urea that, under the effect of temperature, is converted to ammonia, which in the presence of a catalytic converter (or catalyst), converts the nitrogen oxides (NOx) into water vapour and nitrogen which are harmless to the environment.
  • a catalytic converter or catalyst
  • This fluid additive is carried in an independent tank, generally close to the fuel tank.
  • Fluid filtration units for motor vehicle exhaust systems comprising a support, a flat filter member and a conical filter member which are mounted on the support and arranged facing each other.
  • DHC dirt holding capacity
  • the invention aims to provide a fluid filtration unit offering a greater dirt holding capacity, with this filtration unit which is particularly simple, convenient and economical.
  • a subject of the invention is therefore, in a first aspect, a fluid filtration unit comprising a support, a first flat filter member and a second flat filter member, each mounted on said support facing each other, characterized in that it further comprises a third filter member having the form of a bag mounted on said support and a communicating tube, with said first member and said second member being configured such that they define between them a space forming an outlet chamber for a filtered fluid and being configured to allow a fluid communication to said outlet chamber exclusively through themselves, with said third filter member having an internal filtration chamber provided with a first outlet opening for a fluid into said communicating tube, and with said tube being open by a second outlet opening for said fluid through said second flat filter member.
  • the filtration unit according to the invention makes it possible to offer a filtration unit having a particularly long life span, without maintenance.
  • the combination of the third filter member in bag form with the second flat filter member in fact makes it possible to increase the dirt retention capacity of the filtration unit.
  • This combination is particularly convenient in comparison with a filter member of the folded type used alone, which would itself also make it possible to increase the dirt holding capacity.
  • the production of a folded filter member is complex since it is necessary to fold the fabric forming the filtration surface before cutting it to the desired dimensions (the reverse being even more complicated due to the fibrous material with a variable density which is used, which does not by itsel retain the shape given to it).
  • the cutting can be done by temporarily folding the fabric but the elasticity is then lost, or by gripping the folds but the cut is ther not clean.
  • such a filter member in bag form has a filtration surface area which is smaller than that of a folded filter member.
  • the folds of a folded filter member are not all used in the same manner, so that the dirt holding capacity is not homogeneous over the whole surface area of the folded filter member, whereas the dirt holding capacity is substantially homogeneous over the entire filtration surface of the filter member in bag form.
  • the filtration unit according to the invention makes it possible to offer a utilization which is particularly simple, convenient and economical.
  • the filtration unit according to the invention is moreover compatible with an exhaust system provided with a catalytic converter and configured to implement the technology of selective catalytic reduction by the injection of a fluid additive.
  • the filtration unit according to the invention is compatible with a tank of such a fluid additive.
  • the filtration unit according to the invention is moreover particularly useful for this purpose since, in the light of current and future antipollution standards, the majority of vehicle manufacturers equip the latter with such reservoirs of fluid additives to be injected into the vehicle exhaust system, and therefore to be filtered prior to injection via the filtration unit according to the invention.
  • the filtration unit according to the invention offers the advantage of having a capacity which is particularly large, this unit might not require any maintenance throughout the life span of the vehicle.
  • the filtration unit according to the invention is therefore particularly simple, convenient and economical.
  • the invention also relates to a fluid filtration unit comprising a support, a first flat filter member and a second flat filter member each mounted on said support facing each other, characterized in that it further comprises a third filter member having the form of a bag mounted on said support facing said second flat filter member, so that the latter is interposed between said first flat filter member and said third filter member in bag form, and a communicating tube, with said first member and said second member being configured so that they define between them a space forming an outlet chamber for a filtered fluid and being configured to allow a fluid communication to said outlet chamber exclusively through themselves, with said third filter member having an internal filtration chamber provided with a first outlet opening for said filtered fluid opening into said communicating tube, and with said tube being open by a second outlet opening for said filtered fluid into said outlet chamber for said filtered fluid.
  • the invention also relates to a fluid filtration unit comprising a support, a first flat filter member and a second flat filter member each mounted on said support facing each other, characterized in that it further comprises a third filter member having the form of a bag mounted on said support and interposed between said first flat filter member and said second flat filter member, and a communicating tube, with said first member and said second member being configured so that they define between them a space forming an outlet chamber for a filtered fluid and being configured to allow a fluid communication to said outlet chamber exclusively through themselves, with said third filter member having an internal filtration chamber arranged in said outlet chamber and provided with a first inlet opening for a fluid to be filtered opening into said communicating tube and with said tube being open by a second opening out of said outlet chamber.
  • said tube therefore opens by its second opening out of the internal space of said support.
  • said first flat filter member has a first filtration surface and said second flat filter member has a second filtration surface and comprises said communicating tube, and said fluid communication to said outlet chamber is carried out exclusively through said first filtration surface and/or said second filtration surface and/or said communicating tube;
  • said stay is formed by a ring situated on a second filtration surface of said second filter member and said third filter member is configured to be mounted on said ring;
  • said ring has an internal space opening at its ends and forms said communicating tube;
  • said ring is of substantially cylindrical shape with a first flat tubular portion engaged with said second filtration surface of said second filter member and a second tubular portion on which said third filter member is configured to be mounted;
  • said third filter member comprises an anchorage device configured to be fastened to said communicating tube and in which is formed said first outlet opening for said filtered fluid;
  • said third filter member comprises several walls forming an envelope defining said internal filtration chamber and a spacing device configured to hold said walls apart;
  • said anchorage device and said spacing device are formed as a single piece
  • said spacing device is provided with at least one arm which extends into said internal chamber and which bears a plurality of fins configured to guide the filtered fluid;
  • the unit is formed by a first part comprising said first filter member and by a second part comprising said second filter member, said third filter member and said communicating tube, with said first part and said second part being fastened together;
  • said support comprises an outlet channel extending from said outlet chamber to an outlet connection for said filtered fluid, said outlet channel delimiting an internal space open to said outlet chamber by at least one third outlet opening for said filtered fluid and being open through said outlet connection by at least one fourth outlet opening for said filtered fluid;
  • said support is formed by an envelope having a partly cylindrical wall with a closed outline and provided with an edge at the location of which is mounted said second filter member, said wall being configured to surround said third filter member; and by a frame on which is mounted said first filter member, which frame is mounted on said edge of said wall; and/or
  • the unit comprises a fourth filter member having the form of a bag mounted on said support and another communicating tube, with said fourth filter member having an internal filtration chamber provided with a first outlet opening for a fluid into said communicating tube, and with said tube being open by a second outlet opening for said fluid through said first flat filter member.
  • a subject of the invention is also, in a second aspect, a system comprising a tank configured to receive a fluid to be filtered, a unit as described above and a pump provided with an inlet connection configured to be connected to an outlet connection for filtered fluid from said filtration unit, which is configured so that said first filter member, second filter member and third filter member are immersed in said tank.
  • the filtration unit of the system according to the invention it is particularly advantageous to use the latter for the filtration of various fluids such as in particular fluid additives, for example of the AdBlueTM type, for vehicle exhaust systems, or transmission or vehicle engine lubricants, or also vehicle fuels.
  • fluid additives for example of the AdBlueTM type
  • the invention also relates to a group of filtration units, comprising a first filtration unit as described above and a second filtration unit comprising a support identical to the support of said first filtration unit, a first flat filter member identical to the first flat filter member of said first filtration unit, a second flat filter member identical to the second flat filter member of said first filtration unit; said second filtration unit having no third filter member.
  • Such a group can therefore be produced in a particularly simple, convenient and economical manner, the main components of the filtration units being identical.
  • this group makes it possible to very simply adapt the dirt holding capacity according to need, by mounting or not mounting the third filter member in bag form.
  • said second filtration unit has a communicating tube identical to the communicating tube of said first filtration unit, with said communicating tube having, in its internal space, a portion of filtration fabric of said second flat filter member.
  • FIG. 1 diagrammatically represents a motor vehicle exhaust system comprising in particular a fluid tank and a filtration unit for this fluid according to a first embodiment
  • FIG. 2 and 3 diagrammatically represent, in perspective, the filtration unit visible in Figure 1 in isolation, from different viewing angles making it possible to see the top and bottom of this filtration unit;
  • FIG. 4 and 5 diagrammatically represent, in perspective, the filtration unit visible in Figure 1 in an exploded view, from different viewing angles making it possible to see the top and bottom of the components of this filtration unit;
  • FIG. 6 is a cross-section showing the inside of the filtration unit visible in Figure 1 in more detail;
  • FIG. 7 diagrammatically represents, in perspective, an embodiment variant of the filtration unit visible in Figure 1 , in an exploded view and from a viewing angle making it possible to see the top of this filtration unit;
  • FIG. 8 diagrammatically represents, in perspective, the filtration unit illustrated in Figure 7, in an assembled state and from a viewing angle making it possible to see the bottom of this filtration unit;
  • FIG. 9 is a highly schematic cross-section of a filtration unit according to a second embodiment
  • FIG. 10 diagrammatically represents, in perspective, the filtration unit illustrated in Figure 9 in isolation, from a viewing angle making it possible to see the bottom of this filtration unit;
  • Figures 11 and 12 are cross-sections through different cross- sectional axes showing the inside of the filtration unit illustrated in Figures 9 and
  • FIG. 13 diagrammatically represents, in perspective, an embodiment variant of the filtration unit illustrated in Figures 9 to 12, in an exploded view and from a viewing angle making it possible to see the top of this filtration unit;
  • FIG. 14 and 15 are highly schematic cross-sections of filtration units according to a third and a fourth embodiment respectively.
  • Figure 1 illustrates an exhaust system 1 of a motor vehicle (not shown) comprising a silencer 2 provided with a catalyst, a fluid tank 3, a filtration unit 4 according to a first embodiment and a pump 5.
  • the exhaust system 1 is here a selective catalytic reduction (SCR) system for reducing nitrogen oxide (NOx).
  • SCR selective catalytic reduction
  • the tank 3 is here distinct from the silencer 2 and arranged in proximity to a fuel tank (not shown).
  • This tank 3 is configured to receive a fluid, and more precisely a liquid additive, for example AdBlueTM.
  • Selective catalytic reduction technology is based on the injection of this liquid additive into the silencer 2.
  • This liquid additive is an aqueous solution of synthetic urea which, under the effect of temperature, is converted to ammonia, which, in the presence of the catalyst in the silencer 2, converts the nitrogen oxides (NOx) into water vapour and nitrogen which are harmless to the environment.
  • This liquid additive requires filtering before being injected into the silencer 2. This is why the filtration unit 4 is at least partly immersed in the tank 3.
  • This filtration unit 4 comprises a support having the general shape of an annular frame, i.e. like a cylindrical wall open at its ends which are opposite.
  • This annular support is thus formed by an envelope 6 and a frame 7 mounted on the envelope 6, with this frame 7 having three spacing pins 8 as well as a thermally conductive element 9.
  • the envelope 6 and the frame 7 extend in a substantially longitudinal direction and the spacing pins and the thermally conductive element 9 for their part extend in a transverse direction to the longitudinal direction.
  • the filtration unit 4 is shown completely immersed in the tank 3, but in certain cases, this filtration unit 4 is partly immersed in the tank 3.
  • the spacing pins 8 are here configured to be supported against an internal component (not shown) of the tank 3 in order to hold the frame 7 apart from the internal component of the tank 3, so that the unit 4 is not supported tightly against this component.
  • the pump 5 is configured to draw the liquid additive contained in the tank 3 by suction through the filtration unit 4 in order to inject this additive into the catalyst of the silencer 2 in order to reduce the emission of pollutant gases, and in particular of nitrogen oxide (NOx).
  • NOx nitrogen oxide
  • the pump 5 is shown completely immersed in the tank 3 but in certain cases, this pump 5 is not immersed in this tank 3 but is arranged in immediate proximity to the outside of the tank 3.
  • liquid additive feed to the filtration unit 4 is shown highly diagrammatically by the arrows arranged at the upper level of the unit 4 and at the lower level of the unit 4 in Figure 1 , so that the filtration unit 4 does not require a specific inlet tube, as will be seen in detail hereafter.
  • This filtration unit 4 is provided with a pump connection 10, also called a filtered fluid outlet connection, shown here at a free end of the thermally conductive element 9, but in reality, this outlet connection 10 is arranged at the opposite end of this thermally conductive element 9 ( Figures 2 and 3), i.e. at the lower level of the unit 4 ( Figures 2 and 3).
  • a pump connection 10 also called a filtered fluid outlet connection, shown here at a free end of the thermally conductive element 9, but in reality, this outlet connection 10 is arranged at the opposite end of this thermally conductive element 9 ( Figures 2 and 3), i.e. at the lower level of the unit 4 ( Figures 2 and 3).
  • This thermally conductive element 9 is configured to be electrically connected in order to heat the filtered fluid before it leaves the filtration unit.
  • the pump 5 is for its part provided with an inlet connection 11 configured to be connected, directly or via a pipe, to the pump connection 10.
  • the link between the filtration unit 4 and the pump 5 is shown very diagrammatically by a solid line with an arrow indicating the direction of flow of the liquid additive from the filtration unit 4 towards the pump 5, which arrow is shown between the pump connection 10 of the filtration unit 4 and the inlet connection 11 of the pump 5.
  • This pump 5 also comprises an injection connection 13 configured to be connected, directly or via a pipe, to another inlet connection 12 arranged for its part on the silencer 2.
  • the link between the pump 5 and the silencer 2 is shown highly diagrammatically by a solid line with an arrow indicating the direction of flow of the fluid additive of the pump 5 towards the silencer 2.
  • the liquid additive originating from the filtration unit 4 is drawn in by suction by the pump 5 then driven out by the pump 5 to feed liquid additive into the catalyst in the silencer 2 of the exhaust system 1.
  • the liquid additive is filtered by the unit 4.
  • the filtration unit 4 will now be described in more detail, with reference to Figures 2 to 6.
  • the filtration unit 4 is formed by the envelope 6 made from plastic material and by the frame 7 which is itself also made from plastic material.
  • the filtration unit 4 moreover has a first flat filter member 14 (Figure 2), a second flat filter member 15 ( Figure 4) and a third filter member in the form of a bag 16 ( Figure 3).
  • the envelope 6 and the frame 7 are two distinct parts fastened to each other, here by welding.
  • the envelope 6 and the frame 7 thus form a support for the first flat filter member 14, second flat filter member 5 and third filter member.
  • the first filter member 14 and the second filter member 15 are here flat members, also referred to as planes, the dirt holding capacity (DHC) of which is a function of the filtration surface area of each of them.
  • DHC dirt holding capacity
  • this filtration surface area of this first filter member 14 and this second filter member 15 in combination is here approximately 9500 mm 2 .
  • the third filter member in bag form 16 also referred to as a "baggy" also has a dirt holding capacity which is a function of its filtration surface area.
  • the filtration surface area of this third filter member 16 is here approximately 7600 mm 2 , i.e. a total filtration surface area of the three filter members 14 to 16 in combination which is here approximately 17100 mm 2 .
  • the envelope 6 has a substantially cylindrical shape, which is substantially semi-annular in section, and has a thickness (or a height with reference here to Figure 2) which substantially gives it the form of a housing into which the second filter member 15 and the third filter member 16 are introduced (Figure 3).
  • This envelope 6 has a partly cylindrical side wall 17 forming a closed outline of the envelope 6, which side wall 17 has an upper edge 18 as well as a lower edge 22 opposite the upper edge 18.
  • edges 18 and 22 are therefore situated at the ends of the support which are opposed to each other.
  • the side wall 17 has a first portion shaped like the arc of a circle with a large diameter, a second substantially straight portion attached to the first portion shaped like the arc of a circle, from which second portion projects a lower arm 19, a third portion shaped like the arc of a circle with a small diameter attached to the lower arm 19 and a fourth substantially straight portion attached at one end to the third portion shaped like the arc of a circle and at another opposite end to the first portion shaped like the arc of a circle.
  • the envelope 6 is provided with an internal space 20 defined only by the side wall 17, so that this envelope 6 is open at this upper edge 18 by an upper opening 23 ( Figure 6) and at the lower edge 22 by a lower opening 21 ( Figure 3).
  • the pump connection 10 is formed at the free end of this lower arm 19.
  • the envelope 6 also has, at its upper edge 18, a half-channel 26 formed along the lower arm 19 along the second substantially straight portion of the side wall 17.
  • This half-channel 26 has a base wall 27 formed by the body of the envelope 6 and low walls 28 defining the height of the half-channel 26.
  • This half-channel has an internal space opening through the pump connection 10 by an outlet opening 29, also called a fourth outlet opening for filtered fluid.
  • This internal space of the half-channel 26 moreover opens into an outlet chamber 30 ( Figure 6) by two openings 31 and 32, also called third outlet openings for filtered fluid.
  • the second flat filter member 15 which is formed here by a flat piece of fabric 33 directly fixed on the envelope 6, is introduced inside the internal space 20 of the envelope 6, at the upper edge 18.
  • the internal space 20 at the lower edge 22 of the envelope 6 thus defines the surface of the fabric 33 and consequently the filtration surface of the second filter member 15.
  • the envelope 6 also has a stay formed as a single part with the fabric 33 of the second filter member 15.
  • This common stay is formed by a ring 35 of substantially cylindrical shape having a first tubular portion 36 ( Figure 6) which is flat and which is configured to be engaged with the fabric 33 of the second filter member 15.
  • This ring 35 also has a second tubular portion 37 on which the third filter member in bag form 16 is configured to be mounted and fastened, here by welding.
  • the ring 35 and in particular its first tubular portion 36, is in fact moulded on the fabric 33 of the second filter member 15.
  • the fabric 33 is perforated at the space inside the ring 35.
  • the second tubular portion 37 of the ring 35 is provided with a first part having a first outer diameter, which first part is attached to the first tubular portion 36, and with a second part having a second outer diameter smaller than the first outer diameter, which second part is attached to the first part.
  • the first and second tubular portions 36 and 37 form a first shoulder 39 and a second shoulder 40 ( Figure 6).
  • This ring 35 forms a communicating tube which has, at one end, an opening 38 also called a second outlet opening for filtered fluid, opening into the outlet chamber for filtered fluid 30.
  • the third filter member 16 is for its part formed by two flexible walls 41 and 42 sealed between them at their ends to form a bag having a closed outline.
  • This internal chamber 43 is provided with an opening 34, also called a first outlet opening for filtered fluid, opening into the communicating tube formed by the ring 35, at an opposite end to the end where the opening 38, also called a second opening, is arranged.
  • the envelope 6 also has an anchorage and spacing device 44 which is provided with a base 45 to which the flexible wall 42 is sealed.
  • This base 45 has a shape complementary to the shape of the second tubular portion 37 of the ring 35 so that the device 44 is configured to be anchored by its base 45 to the ring 35.
  • the base 45 of the device 44 is fastened by welding to this ring 35 on the first and second shoulders 39 and 40.
  • This device 44 also has three conical feet 46 (two of which are visible in Figure 6) rooted on the base 45 and extending away from this base 45 and from the ring 35 as far as a base wall 47 of this device 44, in order to hold the flexible walls 41 and 42 of the third filter member in bag form 16 apart from each other.
  • These three feet 46 are spaced apart from each other for the flow of the filtered fluid.
  • the third filter member in bag form 16 has the general shape of the arc of a circle, like the envelope 6.
  • this third filter member in bag form 16 is introduced in its entirety inside the envelope 6 between the upper opening 23 at which the second flat filter member 15 and the lower opening 21 are sealed.
  • the frame 7 has a general shape substantially similar to that of the envelope 6 except that its thickness, or its height with reference to Figure 2, is for its part much less than the thickness of the envelope 6.
  • the frame 7 therefore has a substantially semi-annular shape and a thickness which gives it the form of a stay configured to receive the first flat filter member 14.
  • This frame 7 therefore has a first portion shaped like the arc of a circle of the same large diameter as that of the first portion of the envelope 6, a second substantially straight portion attached to the first portion shaped like the arc of a circle, from which second portion an upper arm 25 projects, a third portion shaped like the arc of a circle with the same small diameter as that of the first portion of the envelope 6 attached to the upper arm 25, and a fourth substantially straight portion attached at one end to the third portion shaped like the arc of a circle and at another opposite end to the first portion shaped like the arc of a circle.
  • the frame 7 also has an internal space (not shown) the outline of which is defined by an inner edge (not shown) of the frame 7.
  • the first flat filter member 14 which is formed here by a flat piece of fabric 24 directly fastened on the frame 7 is introduced inside this internal space.
  • the internal space of the frame 7 thus defines the surface of the fabric 24 and consequently the filtration surface of the first filter member 14.
  • the three spacing pins 8 are rooted both on the frame 7, at its inner edge, and on the fabric 24.
  • the thermally conductive element 9 is mounted on the upper arm 25 of the frame 7.
  • the frame 7 also has another half- channel 49 formed along the upper arm 25 along the second substantially straight portion of the frame 7.
  • This half-channel 49 has a base wall 50 formed by the body of the frame 7 and low walls 51 defining the height of the half-channel 49.
  • This half-channel has an internal space opening at the thermally conductive element 9 by an outlet opening 52, also called a fourth outlet opening for filtered fluid.
  • the internal space of the half-channel 49 moreover opens into an outlet chamber 30 ( Figure 6) by two openings 53 and 54, also called third outlet openings for filtered fluid.
  • the second flat filter member 15 is sealed on the side wall 17 of the envelope 6 at its upper opening 23.
  • the ring 35, and in particular its first tubular portion 36, is moulded on the fabric 33 of this second flat filter member 15.
  • the third filter member in bag form 16 is for its part sealed, by its flexible wall 42, to the base 45 of the retaining and anchoring device 44.
  • This base 45 is for its part welded on the second tubular portion 37 of the actuating ring 35.
  • the third filter member in bag form 16 is mounted on the envelope 6 using the ring 35 which also forms the communicating tube and which is engaged with the second flat filter member 15.
  • the second flat filter member 15 and the third filter member in bag form 16 are integrated in their entirety in the enclosure (or the internal space) of the envelope 6.
  • the third filter member in bag form 16 and the second flat filter member 15 are therefore arranged facing each other and mounted on the common stay formed by the ring 35.
  • the first flat filter member 14 is for its part sealed on the frame 7, which frame 7 is welded on the upper edge 18 of the side wall 17 of the envelope 6, with the two filter members 14 and 15 facing, and a relatively short distance apart from, each other.
  • the distance separating the filter members 14 and 15 is less than the height of the envelope 6.
  • the frame 7 and the envelope 6 are fastened together so that the two half-channels 26 and 49 are facing with the low walls 28 and 51 coming into contact to form an outlet channel for filtered fluid.
  • the openings 29, 31 and 32 are arranged facing the respective openings 52, 53 and 54 to form together respectively larger openings.
  • the second flat filter member 15 is interposed between the first flat filter member 14 and the third filter member in bag form 16.
  • the assembly formed by the envelope 6, the second flat filter member 15 and the third filter member in bag form 16 form a first, so-called lower, part of the filtration unit 4.
  • This filtration unit 4 also has a second, so-called upper, part which is formed for its part by the frame 7 and the first flat filter member 14.
  • This first flat filter member 14 is arranged facing the second flat filter member 15, with the respective filtration surfaces being arranged substantially parallel.
  • first and second flat filter members 14 and 15 define between them a relatively reduced space which forms the outlet chamber 30 for filtered fluid.
  • this outlet chamber 30 communicates with the communicating tube formed by the ring 35 and consequently with the internal chamber 43 of the third filter member in bag form 16.
  • the filtration unit 4 is configured to allow a fluid communication to the outlet chamber 30 exclusively through the filtration surface of the first flat filter member 14, the filtration surface of the second flat filter member 16 and of the communicating tube formed by the space inside the ring 35.
  • the liquid additive is mostly situated in the tank 3.
  • the vehicle's heat engine is then in operation and the exhaust gases are forced away from the heat engine into the exhaust system 1 , and in particular into the silencer 2 equipped with its catalyst.
  • the pump 5 of the exhaust system 1 then starts up in order to force liquid additive into the catalyst of the silencer 2.
  • the liquid additive to be filtered which is present in the tank 3 is drawn by suction, on the one hand towards the first flat filter member 14 and, on the other hand, towards the third member in bag form 16 and towards the second flat filter member 15.
  • the filtration unit 4 here comprises no inlet tube of liquid to be filtered. This is due to the fact that the filtration unit 4 is immersed in the tank 3.
  • the internal space of the envelope 6 which forms an inlet chamber for the liquid to be filtered before coming into contact with the filter members 15 and 16.
  • This liquid additive thus passes through the fabric 24 of the first flat filter member 14 in order to be filtered and emerges in the outlet chamber 30.
  • the liquid additive to be filtered moreover passes through the fabric 33 of the second flat filter member 15 in order to be filtered and emerges in the outlet chamber 30.
  • the liquid additive to be filtered also passes through the flexible walls 41 and 42 of the third filter member 16 to be filtered, emerges in the internal chamber 43 then passes into this internal chamber 43 until it emerges in the communicating tube, formed by the ring 35, through its opening 34.
  • the filtered additive passes into the communicating tube until it emerges in the outlet chamber 30 through the opening 38.
  • the additive filtered through the first flat filter member 14, the second flat filter member 5 and the third filter member in bag form 16 and situated in the outlet chamber 30 for filtered fluid then progresses until it emerges in an outlet channel formed by the two half-channels 26 and 49 through the openings 31 , 32, 53 and 54.
  • the filtered additive passes into an outlet channel for filtered fluid as far as the pump connection 10 where it passes through the openings 29 and 52 in order to rejoin the inlet connection 11 of the pump 5 of the exhaust system 1 , which pump 5 forces the filtered additive into the catalyst of the silencer 2.
  • the filtered liquid additive is heated at the openings 29 and 52 by the thermally conductive element 9.
  • This step is in fact a preheating of the filtered additive since the latter is also heated on entering the silencer 2.
  • the step of preheating the filtered additive allows the latter to fulfil its function more rapidly, i.e. as soon as it enters the silencer 2, in particular in cold weather.
  • the filtration unit 4 is particularly convenient since its total dirt holding capacity is high compared with the filtration units of the state of the art, and is particularly economical due to the fact that this filtration unit 4 can be permanently mounted in the tank 3 without requiring any maintenance throughout the life span of the motor vehicle.
  • Figures 7 and 8 illustrate an embodiment variant of the filtration unit, representing a low capacity version of the unit, compared to the high capacity version of the unit illustrated in Figures 1 to 6.
  • the filtration unit 104 of Figures 7 and 8 is in every point identical to the filtration unit 4 of Figures 1 to 6, except that the filtration unit 104 has no third filter member in bag form.
  • the filtration unit 104 has only a combination of the first flat filter member 114 and the second flat filter member 115.
  • the first part of the filtration unit 104 is therefore formed, as in the case of the filtration unit 4, by the frame 107 on which the first flat filter member 114 is sealed.
  • the second part of the filtration unit 104 is formed only by the envelope 106 on which the second flat filter member 115 is sealed. It can be seen in Figures 7 and 8 that the portion of fabric 160 of the second filter member has not been cut out from the internal space of the communicating tube formed by the ring 135. In fact, this portion of fabric 160 is retained, and is not perforated as in the unit 4 of Figures 1 to 6
  • the fluid communication to the outlet chamber (not shown) is therefore allowed exclusively through the fabric of the first flat filter member 114 and the fabric of the second flat filter member 115, including through the portion of fabric 160.
  • This filtration unit 104 is particularly useful in the case where a lower dirt holding capacity is required.
  • the filtration unit 4 and the filtration unit 104 therefore form a group of two filtration units which is particularly convenient.
  • this group comprises a first filtration unit 4 and a second filtration unit 104 each of which comprise an identical support formed by the envelope 6, 106 and the frame 7, 107, a first identical flat filter member 14, 114, a second identical flat filter member 15, 115 and an identical communicating tube formed by the ring 35, 135.
  • the difference between the first filtration unit 4 and the second filtration unit 104 is that only the first filtration unit 4 is provided with the third filter member in bag form 16 and that, for this reason, the portion of fabric 160 at the space inside the ring 135 is not perforated.
  • the two filtration units 4 and 104 therefore have different dirt-holding capacities, a high capacity and a lower capacity respectively.
  • This group of two filtration units is therefore particularly simple, convenient and economical both to manufacture and to use.
  • Figures 9 to 12 illustrate a filtration unit 204 of the same type as that illustrated in Figures 2 to 6, according to a second embodiment.
  • the filtration unit 204 is configured to be immersed at least partly in a fluid tank of a motor vehicle exhaust system, which fluid is for example AdBlueTM and which system also has a silencer provided with a catalyst and a pump.
  • a motor vehicle exhaust system which fluid is for example AdBlueTM and which system also has a silencer provided with a catalyst and a pump.
  • the filtration unit 204 a the same general form as the filtration unit 4 and is very similar to the latter,
  • the filtration unit 204 comprises a support formed by an envelope 206 and a frame 207 mounted on the envelope 206, with this frame 207 having three spacing pins 208 ( Figures 10 to 12) as well as a thermally conductive element 209 ( Figures 10 to 12).
  • the envelope 206 and the frame 207 extend in a substantially longitudinal direction and the spacing pins 208 and the thermally conductive element 209 extend for their part in a transverse direction to the longitudinal direction.
  • the spacing pins 208 are configured to be supported against an internal component (not shown) of the tank in order to hold the frame 207 apart from the internal component of the tank, so that the unit 204 is not closely supported against this component.
  • the pump is configured to draw the liquid additive contained in the tank by suction through the filtration unit 204 in order to inject this additive into the catalyst of the silencer to reduce the emission of pollutant gases, and in particular of nitrogen oxide (NOx).
  • NOx nitrogen oxide
  • liquid additive feed to the filtration unit 204 is shown very diagrammatically by the arrows arranged at the upper level of the unit 204 and at the lower level of the unit 204 in Figure 9, so that the filtration unit 204 does not require a specific inlet tube, as will be seen in detail hereafter.
  • This filtration unit 204 is provided with a pump connection 210
  • This thermally conductive element 209 is configured to be electrically connected in order to heat the filtered fluid before it leaves the filtration unit 204.
  • the pump is for its part provided with an inlet connection configured to be connected, directly or via a pipe, to the pump connection 210.
  • This pump also comprises an injection connection configured to be connected, directly or via a pipe, to another inlet connection arranged for its part on the silencer.
  • the liquid additive originating from the filtration unit 204 is drawn in by suction by the pump then forced out by the pump to feed liquid additive into the catalyst of the silencer of the exhaust system.
  • the liquid additive is filtered by the filtration unit 204.
  • the filtration unit 204 is formed by the envelope 206 made from plastic material and the frame 207 itself also made from plastic material.
  • the filtration unit 204 also has a first flat filter member 214, a second flat filter member 215 and a third filter member having the form of a bag 216.
  • the envelope 206 and the frame 207 are two distinct pieces fastened to each other, here by welding.
  • the envelope 206 and the frame 207 thus form a support for the first flat filter member 214, second flat filter member 215 and third filter member 216.
  • the first filter member 214 and the second filter member 215 are here flat members, also called planes, the dirt holding capacity (DHC) of which is a function of the filtration surface area of each of them.
  • DHC dirt holding capacity
  • the filtration surface area of these first filter member 214 and second filter member 215 in combination is here approximately 9500 mm 2 .
  • the third filter member in bag form 216 also called a "baggy" also has a dirt holding capacity which is a function of its filtration surface.
  • the filtration surface area of this third filter member 216 is here approximately 7600 mm 2 , i.e. a total filtration surface area of the three filter members 214 to 216 in combination here being approximately 17100 mm 2 .
  • the envelope 206 has a substantially cylindrical shape, which, in section, is substantially semi-annular, and has a thickness (or a height with reference here to Figures 9, 11 and 12) which substantially gives it the form of a housing into which the second filter member 215 and the third filter member 216 are introduced ( Figures 9, 11 and 12).
  • This envelope 206 has a partly cylindrical side wall 217 forming a closed outline of the envelope 206, which side wall 217 has an upper edge 218 as well as a lower edge 222 opposite the upper edge 218.
  • the side wall 217 has a first portion shaped like the arc of a circle with a large diameter, a second substantially straight portion attached to the first portion shaped like the arc of a circle, from which second portion projects a lower arm 219, a third portion shaped like the arc of a circle with a small diameter attached to the lower arm 219 and a fourth substantially straight portion attached at one end to the third portion shaped like the arc of a circle and at another opposite end to the first portion shaped like the arc of a circle.
  • the envelope 206 is provided with an internal space 220 defined only by the side wall 217, so that this envelope 206 is open at this upper edge 218 by an upper opening 223 and at the lower edge 222 by a lower opening 221.
  • the pump connection 210 is formed at the free end of this lower arm 219.
  • the envelope 206 has at its upper edge 218, a half-channel (not shown) formed along the lower arm 219 and along the second substantially straight portion of the side wall 217.
  • This half-channel has a base wall formed by the body of the envelope 206, low walls defining its height as well as an internal space opening through the pump connection 210 by an outlet opening 229, also called a fourth outlet opening for filtered fluid.
  • the internal space of the half-channel opens into an outlet chamber 230 ( Figures 11 and 12) by two openings, also called third outlet openings for filtered fluid.
  • the second flat filter member 215 which is formed here by a flat piece of fabric 233 directly fastened on the envelope 206.
  • the internal space 220 at the lower edge 222 of the envelope 206 thus defines the surface of the fabric 233 and consequently the filtration surface of the second filter member 215.
  • the envelope 206 also has a stay formed as a single part with the fabric 233 of the second filter member 215.
  • This common stay is formed by a ring 235 with a substantially cylindrical shape which has a first tubular portion 236 ( Figure 11) which is flat and which is configured to be engaged with the fabric 233 of the second filter member 215.
  • This ring 235 also has a second tubular portion 237 on which the third filter member in bag form 216 is configured to be mounted and fastened, here by welding.
  • the ring 235 and in particular its first tubular portion 236, is in fact moulded on the fabric 233 of the second filter member 215.
  • the fabric 233 is perforated at the space inside the ring 235.
  • the second tubular portion 237 of the ring 235 is provided with a first part having a first outer diameter, which first part is attached to the first tubular portion 236, and with a second part having a second outer diameter smaller than the first outer diameter, which second part is attached to the first part.
  • This ring 235 forms a communicating tube which has, at one end, an opening 238 also called a second outlet opening for filtered fluid, opening into the outlet chamber for filtered fluid 230.
  • the common stay also has two moulding lugs 248 each joining the ring 235 and the envelope 206.
  • the third filter member 216 is for its part formed by two flexible walls
  • This internal chamber 243 is provided with an opening 234, also called a first outlet opening for filtered fluid, opening into the communicating tube formed by the ring 235, at an end opposite the end where the opening 238, also called a second opening, is arranged.
  • the envelope 206 also has an anchorage and spacing device 244 which is provided with a base 245 to which the flexible wall 242 is sealed.
  • the base 245 and the second tubular portion 237 of the ring 235 are jointly formed from plastic material so that the anchorage device 244 and the ring 235 are formed from plastic material in a single piece.
  • This member 244 also has three conical feet 246 rooted on the base 245 and extending away from this base 245 and from the ring 235 as far as a base wall 247 of this member 244, in order to keep the flexible walls 241 and 242 of the third filter member in bag form 216 apart from each other.
  • These three feet 246 are spaced apart from each other for the flow of the fluid to be filtered.
  • This member is moreover provided with arms 280 which extend into the internal chamber 243, with these arms 280 bearing fins 281 configured to guide the fluid to be filtered.
  • the third filter member in bag form 216 has the general shape of the arc of a circle, like the envelope 206.
  • This third filter member in bag form 216 is introduced in its entirety inside the envelope 206 between the lower opening 221 at which is sealed the second flat filter member 215 and the upper opening 223.
  • the third filter member 216 is therefore interposed between the first and second filter members 214 and 215 so that it is situated in the outlet chamber 230.
  • the frame 207 will now be described in more detail.
  • the frame 207 has a general shape substantially similar to that of the envelope 206 except that its thickness, or its height with reference to Figure 9, is for its part much less than the thickness of the envelope 206.
  • the frame 207 has a substantially semi-annular shape and a thickness which gives it the form of a stay configured to receive the first flat filter member 214.
  • This frame 207 has a first portion shaped like the arc of a circle with the same large diameter as that of the first portion of the envelope 206, a second substantially straight portion attached to the first portion shaped like the arc of a circle, from which second portion projects an upper arm 225, a third portion shaped like the arc of a circle with the same small diameter as that of the first portion of the envelope 206 attached to the upper arm 225, and a fourth substantially straight portion attached at one end to the third portion shaped like the arc of a circle and at another opposite end to the first portion shaped like the arc of a circle.
  • the frame 207 also has an internal space (not shown) the outline of which is defined by an inner edge (not shown) of the frame 207.
  • the first flat filter member 214 which is formed here by a flat piece of fabric 224 directly fastened on the frame 207 is introduced into this internal space.
  • the internal space of the frame 207 thus defines the surface of the fabric 224 and consequently the filtration surface of the first filter member 214.
  • the three spacing pins 208 are rooted both on the frame 207, at its inner edge, and on the fabric 224.
  • the thermally conductive element 209 is mounted on the upper arm
  • the frame 207 of the unit 204 has another half-channel (not shown) formed along the upper arm 225 and along the second substantially straight portion of the frame 207.
  • This half-channel has a base wall formed by the body of the frame 207, low walls defining its height as well as an internal space opening at the thermally conductive element 209 by an outlet opening, also called a fourth outlet opening for filtered fluid.
  • the internal space of the half-channel moreover opens into the outlet chamber 230 by two openings, also called third outlet openings for filtered fluid.
  • the filtration unit 204 in its assembled state will now be described in more detail.
  • the second flat filter member As has already been described above, the second flat filter member
  • the ring 235 is moulded on the fabric 233 of this second flat filter member 2 5, and in particular on its first tubular portion 236.
  • the portion of fabric of the second filter member 215 which is situated inside the ring 235 is cut out then removed.
  • the third filter member in bag form 216 is for its part sealed, by its flexible wall 242, to the base 245 of the retaining and anchoring device 244, which base 245 is jointly formed from plastic material with the second tubular portion 237 of the ring 235.
  • the third filter member in bag form 216 is mounted on the envelope 206 via the ring 235 which moreover forms the communicating tube and which is engaged with the second flat filter member 215.
  • the second flat filter member 215 and the third filter member in bag form 216 are integrated in their entirety in the enclosure (or the internal space) 220 of the envelope 206.
  • the third filter member in bag form 216 and the second flat filter member 215 are therefore arranged facing each other and mounted on the common stay formed by the ring 235.
  • the first flat filter member 214 is for its part sealed on the frame 207, which frame 207 is welded on the upper edge 218 of the side wall 217 of the envelope 206, with the two filter members 214 and 215 facing and relatively far apart from each other; and the third filter member in bag form 216 is interposed between these two latter.
  • the distance separating the filter members 214 and 215 is substantially equal to the height of the envelope 206.
  • the frame 207 and the envelope 206 are fastened together so that the two half-channels are facing with the low walls coming into contact to form an outlet channel for filtered fluid.
  • the assembly formed by the envelope 206, the second flat filter member 215 and the third filter member in bag form 216 form a first, so-called lower part of the filtration unit 204.
  • This filtration unit 204 also has a second, so-called upper part which for its part is formed by the frame 207 and the first flat filter member 214.
  • This first flat filter member 214 is arranged facing the second flat filter member 215, with the respective filtration surfaces being arranged substantially parallel.
  • the first and second flat filter members 214 and 215 define between them a relatively large space which forms the outlet chamber 230 for filtered fluid, in which the third filter member 216 is situated.
  • This outlet chamber 230 communicates indirectly with the communicating tube formed by the ring 235, via the internal chamber 243 of the third filter member in bag form 216 and with the inside of the tank since the second outlet opening for filtered fluid 238 opens through the second filter member 215, out of this outlet chamber 230, i.e. out of the internal space 220 of the envelope 206 and more generally out of the support.
  • the filtration unit 204 is configured to allow a fluid communication to the outlet chamber 230 exclusively through the filtration surface of the first flat filter member 214, the filtration surface of the second flat filter member 215 and the third filter member 216 via the communicating tube formed by the space inside the ring 235.
  • the liquid additive When the motor vehicle is started, the liquid additive is mostly situated in the tank.
  • the heat engine of the vehicle is then in operation and the exhaust gases are forced away from the heat engine into the exhaust system and in particular into the silencer equipped with its catalyst.
  • the pump of the exhaust system then starts up in order to force liquid additive into the catalyst of the silencer.
  • the liquid additive to be filtered which is present in the tank is drawn by suction, on the one hand, towards the first flat filter member 214 and, on the other hand, towards the second flat filter member 215 and towards the third member in bag form 216 via the ring 235.
  • the first flat filter member 214 which is arranged flush and therefore in direct contact with the additive (there is no inlet chamber for the liquid to be filtered before coming into contact with the filter member 2 4).
  • the second flat filter member 215 which is arranged flush and therefore in direct contact with the additive (there is no inlet chamber for the liquid to be filtered before coming into contact with the filter member 215).
  • This liquid additive therefore passes through both the fabric 224 of the first flat filter member 214 and through the fabric 233 of the second flat filter member 215 in order to be filtered and emerges in the outlet chamber 230.
  • the liquid additive to be filtered also passes through the communicating tube formed by the ring 235 in order to enter the internal chamber 243 of the third filter member in bag form 216 then through the flexible walls 241 and 242 of this third filter member 216 (being guided by the fins 281) in order to be filtered and emerges in the outlet chamber 230.
  • the internal chamber 243 of the third filter member 216 of the unit 204 is configured to contain fluid to be filtered, i.e. dirty fluid.
  • the additive filtered through the first flat filter member 214, the second flat filter member 215 and the third filter member in bag form 216 and being situated in the outlet chamber 230 for filtered fluid then progresses until it emerges in an outlet channel formed by the two half-channels and associated openings.
  • the filtered additive progresses into an outlet channel for filtered fluid as far as the pump connection 210 where it passes through the associated openings in order to rejoin the inlet connection of the pump of the exhaust system, which pump forces the filtered additive into the catalyst of the silencer.
  • the filtered liquid additive is heated by the thermally conductive element 209.
  • This step is in fact a preheating of the filtered additive since the latter is also heated on entering the silencer.
  • the step of preheating of the filtered additive allows the latter to fulfil its function more rapidly, i.e. as soon as it enters the silencer, in particular in cold weather.
  • the filtration unit 204 is particularly convenient since its total dirt- holding capacity is high compared with the filtration units of the state of the art, and is particularly economical due to the fact that this filtration unit 204 can be permanently mounted in the tank without requiring any maintenance throughout the life span of the motor vehicle.
  • Figure 13 illustrates an embodiment variant of the filtration unit 204, showing a low capacity version of the unit, compared with the high capacity version of the unit illustrated in Figures 9 to 12.
  • the filtration unit 304 is in every point identical to the filtration unit 204, except that the filtration unit 304 has no third filter member in bag form.
  • the filtration unit 304 has only the combination of the first flat filter member 314 and the second flat filter member 315.
  • the first part of the filtration unit 304 is therefore formed, as for the filtration unit 204, by the frame 307 on which the first flat filter member 314 is sealed.
  • the second part of the filtration unit 304 is formed only by the envelope 306 on which the second flat filter member 315 is sealed.
  • the portion of fabric 360 of the second filter member 315 has not been cut out from the internal space of the communicating tube formed by the ring 335. In fact, this portion of fabric 360 is retained, and is not perforated as in the unit 204.
  • the fluid communication to the outlet chamber (not shown) is therefore allowed exclusively through the fabric of the first flat filter member 314 and the fabric of the second flat filter member 315, including through the portion of fabric 360.
  • This filtration unit 304 is particularly useful in the case where a lower dirt holding capacity is required.
  • the filtration unit 204 and the filtration unit 304 therefore form a group of two filtration units which is particularly convenient.
  • this group comprises a first filtration unit 204 and a second filtration unit 304 which each comprise an identical support formed by the envelope 206, 306 and the frame 207, 307, a first identical flat filter member 214, 314, a second identical flat filter member 215, 315 and an identical communicating tube formed by the ring 235, 335.
  • the difference between the first filtration unit 204 and the second filtration unit 304 is that only the first filtration unit 204 is provided with the third filter member in bag form 216 and that, for this reason, the portion of fabric 360 at the space inside the ring 335 is not perforated.
  • the two filtration units 204 and 304 therefore have different dirt- holding capacities, a high capacity and a lower capacity respectively.
  • This group of two filtration units is itself therefore also particularly simple, convenient and economical both to manufacture and to use.
  • Figure 14 illustrates a filtration unit 404 of the same type as that illustrated in Figures 9 to 12, according to a third embodiment. Generally, for similar components, the same references have been used but with 200 added.
  • the filtration unit 404 is in every point identical to the filtration unit 204 illustrated in Figures 9 to 12, with the difference that the ring 435 forming the communicating tube is here moulded on the fabric 424 of the first filter member 414 rather than on the fabric 433 of the second filter member 415.
  • this ring 435 is linked, via the fabric 424, to the frame 407 rather than to the envelope 406.
  • the third filter member 416 which is here also arranged in the outlet chamber 430 defined between the first filter member 414 and the second filter member 415, has its internal chamber 443 open by its opening 434 in the tube formed by the ring 435, which opens by its opening 438 at the upper part of the unit 404, through the first filter member 414 to the outside of this unit 404.
  • Figure 15 illustrates a filtration unit 504 of the same type as that illustrated in Figures 9 to 12, according to a fourth embodiment.
  • the filtration unit 504 is in every point identical to the filtration units 204 and 404 illustrated in Figures 9 to 12 and 14 respectively, with the difference that here there is a combination of these two units 204 and 404.
  • the unit 504 here has two identical third filter members 516 each arranged in the outlet chamber 530 and each provided with an internal chamber 543 open by an opening 534 into a respective communicating tube each formed by a ring 535, each of these rings 535 open by a respective opening 538 outside the unit 504.
  • one of the rings 535 is moulded on the fabric 524 of the first flat filter member 514 and is consequently linked to the frame 507; and the other ring 535 is moulded on the fabric 533 of the second flat filter member 515 and is consequently linked to the envelope 506.
  • the total filtration surface area of the unit 504 is therefore even greater than that of the respective units 204 and 404.
  • the second filtration unit moreover has no ring, and only the fabric forms the second flat filter member.
  • At least one ring is moulded on the fabric of the second flat filter member and/or on the fabric of the first flat filter member; and the fabric at the space inside the ring is perforated.
  • a shut-off device such as a stopper is mounted, for example by welding, on the ring in order to shut off its internal space.
  • the filtration unit is not immersed in a tank of liquid additive for an exhaust system, but rather in a tank of motor vehicle transmission lubricant or heat engine lubricant, or also in a fuel tank;
  • the spacing device of the flexible walls of the third filter member in bag form visible in Figure 4 is moreover provided with arms extending into the internal chamber of this third filter member in bag form, with these arms bearing fins configured to guide the filtered fluid and/or the spacing device of the flexible walls of the third filter member in bag form visible in Figure 11 has no such arms;
  • the filtration unit has two filter members in bag form, the two being outside the outlet chamber or the two being inside the outlet chamber or one being inside the outlet chamber and the other outside; and they either both open into a tube which itself opens through the first filter member or the second filter member, or one opens into a tube which itself opens through the first filter member and the other opens into another tube which itself opens through the second filter member;
  • the filtration unit does not only have one filter member in bag form or two, but rather more than one or two;
  • the filtration unit does not have a substantially cylindrical shape, but rather a parallelepipedic shape or also a different shape;
  • the frame and the envelope of the filtration unit are not made completely from plastic material, but partly from a metallic material. It is recalled more generally that the invention is not limited to the examples described and shown.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

Cette invention concerne une unité de filtration de fluide comprenant un support (6,7), un premier élément de filtre plat (14) et un deuxième élément de filtre plat (15) montés face à face sur ledit support (6, 7) et définissant entre eux un espace formant une chambre de sortie (30) pour le fluide filtré, l'accès du fluide à cette chambre passant exclusivement par eux. Un troisième élément de filtre (16) en forme de poche est monté sur ledit support (6, 7) et comporte une chambre de filtration interne (43) présentant une première ouverture (34) pour le passage d'un fluide, ladite ouverture débouchant dans un tube de communication (35) de l'unité de filtration de fluide, ledit tube présentant une seconde ouverture (38) pour le passage dudit fluide dans ledit deuxième élément de filtre plat (15).
PCT/IB2012/050934 2011-05-10 2012-02-28 Unité de filtration de fluide Ceased WO2012153202A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR1154030 2011-05-10
FR1154030A FR2975013A1 (fr) 2011-05-10 2011-05-10 Unite de filtration de fluide
FR1251004A FR2975014B1 (fr) 2011-05-10 2012-02-02 Unite de filtration de fluide
FR1251004 2012-02-02

Publications (1)

Publication Number Publication Date
WO2012153202A1 true WO2012153202A1 (fr) 2012-11-15

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FR (2) FR2975013A1 (fr)
WO (1) WO2012153202A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016221140A1 (de) * 2016-10-27 2018-05-03 Robert Bosch Gmbh Tankeinbaueinheit
WO2018147778A1 (fr) * 2017-02-07 2018-08-16 Scania Cv Ab Dispositif de filtration de liquide, unité de dosage d'agent de réduction, système de dosage d'agent de réduction et véhicule comprenant le dispositif de filtration de liquide
WO2019020442A1 (fr) * 2017-07-25 2019-01-31 Robert Bosch Gmbh Filtre à liquide et système filtrant de réservoir pourvu d'un filtre à liquide
DE102017212826A1 (de) * 2017-07-25 2019-01-31 Robert Bosch Gmbh Flüssigkeitsfilter und Tankfiltersystem mit einem Flüssigkeitsfilter
GB2610228A (en) * 2021-08-31 2023-03-01 Perkins Engines Co Ltd A filter arrangement for a selective catalytic reduction system

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US4402827A (en) * 1980-07-11 1983-09-06 Sealed Power Corporation Transmission fluid filter
US4874510A (en) * 1986-01-17 1989-10-17 Nifco Inc. Filter for fuel tank
EP1481716A1 (fr) * 2003-05-29 2004-12-01 IBS Filtran Kunststoff-/Metallerzeugnisse GmbH Filtre pour moteur et transmission à flux rentrant et procédé
US20090294343A1 (en) * 2008-05-29 2009-12-03 Lev Pekarsky Suction Filter for Automatic Transmission Fluid

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US4402827A (en) * 1980-07-11 1983-09-06 Sealed Power Corporation Transmission fluid filter
US4874510A (en) * 1986-01-17 1989-10-17 Nifco Inc. Filter for fuel tank
EP1481716A1 (fr) * 2003-05-29 2004-12-01 IBS Filtran Kunststoff-/Metallerzeugnisse GmbH Filtre pour moteur et transmission à flux rentrant et procédé
US20090294343A1 (en) * 2008-05-29 2009-12-03 Lev Pekarsky Suction Filter for Automatic Transmission Fluid

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016221140A1 (de) * 2016-10-27 2018-05-03 Robert Bosch Gmbh Tankeinbaueinheit
DE102016221140B4 (de) 2016-10-27 2024-12-19 Robert Bosch Gmbh Tankeinbaueinheit und Vorratstank umfassend eine Tankeinbaueinheit
WO2018147778A1 (fr) * 2017-02-07 2018-08-16 Scania Cv Ab Dispositif de filtration de liquide, unité de dosage d'agent de réduction, système de dosage d'agent de réduction et véhicule comprenant le dispositif de filtration de liquide
KR20200035028A (ko) * 2017-07-25 2020-04-01 로베르트 보쉬 게엠베하 액체 필터 및 액체 필터를 포함한 탱크 필터 시스템
DE102017212768A1 (de) * 2017-07-25 2019-01-31 Robert Bosch Gmbh Flüssigkeitsfilter und Tankfiltersystem mit einem Flüssigkeitsfilter
CN110913968A (zh) * 2017-07-25 2020-03-24 罗伯特·博世有限公司 液体过滤器和具有液体过滤器的箱式过滤系统
DE102017212826A1 (de) * 2017-07-25 2019-01-31 Robert Bosch Gmbh Flüssigkeitsfilter und Tankfiltersystem mit einem Flüssigkeitsfilter
CN110913968B (zh) * 2017-07-25 2022-02-22 罗伯特·博世有限公司 液体过滤器和具有液体过滤器的箱式过滤系统
US11325061B2 (en) 2017-07-25 2022-05-10 Robert Bosch Gmbh Liquid filter and tank filter system including a liquid filter
KR102468898B1 (ko) 2017-07-25 2022-11-22 로베르트 보쉬 게엠베하 액체 필터 및 액체 필터를 포함한 탱크 필터 시스템
WO2019020442A1 (fr) * 2017-07-25 2019-01-31 Robert Bosch Gmbh Filtre à liquide et système filtrant de réservoir pourvu d'un filtre à liquide
GB2610228A (en) * 2021-08-31 2023-03-01 Perkins Engines Co Ltd A filter arrangement for a selective catalytic reduction system
GB2610228B (en) * 2021-08-31 2023-08-23 Perkins Engines Co Ltd A filter arrangement for a selective catalytic reduction system
US11801465B2 (en) 2021-08-31 2023-10-31 Perkins Engines Company Limited Filter arrangement for a selective catalytic reduction system

Also Published As

Publication number Publication date
FR2975014A1 (fr) 2012-11-16
FR2975014B1 (fr) 2017-05-19
FR2975013A1 (fr) 2012-11-16

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