WO2013038252A1 - Cartouche filtrante et groupe filtrant pour la cartouche - Google Patents

Cartouche filtrante et groupe filtrant pour la cartouche Download PDF

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Publication number
WO2013038252A1
WO2013038252A1 PCT/IB2012/001759 IB2012001759W WO2013038252A1 WO 2013038252 A1 WO2013038252 A1 WO 2013038252A1 IB 2012001759 W IB2012001759 W IB 2012001759W WO 2013038252 A1 WO2013038252 A1 WO 2013038252A1
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WO
WIPO (PCT)
Prior art keywords
filter
filter wall
wall
liquid
chamber
Prior art date
Application number
PCT/IB2012/001759
Other languages
English (en)
Inventor
Giorgio Girondi
Original Assignee
Ufi Filters S.P.A.
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 Ufi Filters S.P.A. filed Critical Ufi Filters S.P.A.
Priority to CN201280044930.6A priority Critical patent/CN103998110B/zh
Publication of WO2013038252A1 publication Critical patent/WO2013038252A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/001—Filters in combination with devices for the removal of gas, air purge systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B01D36/005—Liquid level sensing means, e.g. for water in gasoil-filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B01D36/006—Purge means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/04—Supports for the filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/188—Multiple filtering elements having filtering areas of different size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/29—Filter cartridge constructions
    • B01D2201/291—End caps
    • B01D2201/295—End caps with projections extending in a radial outward direction, e.g. for use as a guide, spacing means

Definitions

  • the present invention relates to a filter cartridge and a relative filter group for the filtration of liquids.
  • the invention relates to a filter cartridge and the filter group therefor, provided with means for purging and degassing the air present in the liquid to be filtered and, more particularly, relating to the motor sector for filtering a fuel, such as diesel or petrol, or other more or less viscous liquids, such as lubricating oil or the like.
  • a fuel such as diesel or petrol, or other more or less viscous liquids, such as lubricating oil or the like.
  • the filtration of a liquid in the motor sector is generally obtained with a group that comprises an external casing provided with a substantially beaker-shaped body, the open end of which is closed by a cover provided with an inlet of a liquid to be filtered and an outlet for the filtered liquid; at least a filter cartridge is contained internally of the casing, which filter cartridge is suitable for subdividing the internal volume of the casing into two distinct chambers, of which a first chamber is in communication with the inlet and a second chamber communicates with the outlet.
  • the liquid flowing from the inlet towards the outlet of the filter group is forced to filter through the filter wall that retains the impurities possibly present in it, and may also separate the water from the fuel.
  • a typical filter cartridge comprises a filter wall having a tubular shape, for example a pleated filter wall or a depth filter wall, and two support plates which are fixed to the opposite ends of the filter wall.
  • an inlet conduit and an outlet conduit are realised, the inlet conduit being connected to the liquid tank by means of the inlet, and the outlet conduit opening together with the outlet and taking the filtered liquid towards the users downstream of the filter group to which it is destined.
  • the inlet conduit being connected to the liquid tank by means of the inlet, and the outlet conduit opening together with the outlet and taking the filtered liquid towards the users downstream of the filter group to which it is destined.
  • air a certain amount of dissolved substances in a gaseous state may be present, which in the following will be referred to for simplicity as "air".
  • the air present in the liquid to be filtered tends to accumulate in the upper part of the chamber of the casing containing the filter wall and must therefore be eliminated during the fucntioning of the filter unit in order to prevent accumulation of the pressurised air inside the chamber causing, when the level of the air reaches the filter wall, any unforeseen injections of large bubbles into the delivery liquid which might lead to problems with the organs downstream of the filter group, in particular the high-pressure pump and the injectors or lubrication circuit.
  • the liquid to be treated e.g. diesel fuel, petrol or lubricating oil
  • the prior art comprises devices constituted by a net which, crossed by the diesel and air, tends to break up the air bubbles, so that smaller air bubbles are produced in outlet than those arriving in inlet.
  • degassing conduits associated to the filter group casing which conduits place the upper part of the casing, where the air tends to accumulate, in communication with the outlet conduit of the liquid, such that the accumulated air is constantly emptied from the casing without the -above-mentioned-drawbacks -connected to the creation of large air bubbles in delivery appearing.
  • the degassing conduit tends to discharge into the liquid delivery from the chamber in communication with the inlet to the chamber in communication with the outlet, thus by-passing the filter wall. There is therefore a loss of efficiency of the filter group due to the introduction of unfiltered liquid into the delivery.
  • a further drawback of known devices is that the micronization of the air bubbles is not always optimal, and this has repercussions on the organs downstream of the filtering unit, to avoid which recourse has to be made to nets or other devices, further fragmenting the air bubbles in outlet.
  • An aim of the present invention is to obviate the above-mentioned drawbacks in the prior art, with a solution that is simple, rational and relatively inexpensive.
  • a filter cartridge comprising:
  • At least a degassing conduit fixed to the support plate configured such as to place an internal volume, delimited by the filter wall, in communication with a volume external thereof, in order to enable outflow of air, which accumulates in use in the casing of the filter group which contains the filter group itself, between the outside and the inside of the filter wall itself.
  • the degassing conduit comprises a choke zone, the passage hole of which is configured such that the fall of pressure on passage of the liquid upstream and downstream of the choke zone is greater than a fall of pressure in the liquid upstream and downstream of the filter wall.
  • the filter cartridge comprises a choke element associated to the degassing conduit which is destined to define the choke zone.
  • the choke zone advantageously comprises a cylindrical body provided with a through-cavity, axial and tapered in the fluid-crossing direction, which terminates with an outlet mouth defining the passage hole of the choking zone.
  • cylindrical body is associated to the degassing conduit at the access mouth thereof.
  • the cylindrical body is associated to the degassing conduit at a distal end of the access mouth thereof.
  • the choke element can be variously arranged along the degassing conduit such as to optimise the micronization of the air bubbles.
  • the support plate comprises a hollow connecting element suitable for connecting the degassing conduit with the internal volume of the filter wall and, advantageously, the distal end of the access mouth of he degassing conduit is associated substantially sealedly to the connecting element.
  • the degassing conduit is such as to branch directly from the support plate of the filter wall, enabling a compact arrangement thereof while at the same time improving the installation and replacement of the filter cartridge.
  • a further aspect of the invention discloses a filter group comprising a casing affording at least an input for a liquid to be filtered and an output for the filtered liquid, and at least a filter cartridge, as described above, which is arranged in such a way as to divide a volume inside the casing into a first chamber communicating with the inlet and a second chamber communicating with the outlet.
  • the first chamber advantageously communicates with the input (via a further filter wall having a greater porosity than the filter wall of the filter cartridge and is suitable for defining an intermediate chamber, interposed between the first chamber and the second chamber into which the internal volume of the casing is divided.
  • the filter cartridge is positioned such that the second chamber is at least partially defined by the internal volume delimited by the filter wall, and such that the degassing conduit can place the intermediate chamber in communication with the second chamber.
  • the invention further discloses a filter cartridge, also independently protectable, which comprises:
  • At least a filter wall having a tubular shape and being crossed by a liquid to be filtered
  • a second filter wall having a tubular shape, the first and second filter walls being positioned such as to be crossed in series by the liquid to be filtered, and wherein the second filter wall is positioned upstream of the first filter wall in the flow direction of the liquid to be filtered,
  • the filter cartridge comprises a hollow cylindrical shank, associated to the support plate of the first filter wall (for example fixed, made in a single piece therewith or removably associated therewith) and inserted in the internal cavity of the second filter wall.
  • the filter cartridge is easy to construct and assemble and enables considerably simplifying the productive process thereof.
  • the support plate can also support the second filter wall, being interposed axially between the first and the second filter wall.
  • the first filter wall comprises a support core provided with openings for passage of the diesel which core delimits the interal cavity of the first filter wall, the cylindrical shank axially prolonging the support core internally of the internal cavity of the second filter wall.
  • the cylindrical core is able to define a passage for the filtered fluid towards the outlet of the fluid.
  • the support core and the cylindrical shank are advantageously associated and continuously to one another, for example in a simple resting relationship.
  • the support core and the cylindrical shank can be realised in a single piece or the cylindrical shank can derive directly from the support plate of the first filter wall and the core can be fixed or simply rested on the opposite surface of the support plate.
  • Figure 1 is a section view along a vertical axial plane of a filter group according to an embodiment of the present invention.
  • Figure 2 is a partially-sectioned lateral view of a detail relative to the filter unit of the filter group of figure 1.
  • Figure 3 is an enlargement of detail III of figure 2.
  • Figure 4 is a section view at a vertical axial plane of a filter group according to a second embodiment of the present invention.
  • the embodiment of the invention illustrated in the figures concerns a filter group 10 for a diesel engine of a motor vehicle, though other embodiments of the invention can relate to filter devices for other types of fuel, such as petrol, or other types of liquids, such as for example, lubricating oil and the like.
  • the filter group denoted in their entirety by 10, comprises an external casing 20 comprising a beaker body 21 , and an upper cover 22 which is suitable for closing the beaker body 21 , on which there are two inlet ducts 23 and an outlet conduit 24 of the diesel.
  • the outlet conduit 24 is located coaxially to the beaker body 21 , while the inlet conduits 24 are located in an offset position.
  • a filter unit is housed in this casing 20, in the present example formed by two filter cartridges, reciprocally superposed, being a lower filter cartridge 30 and an upper filter cartridge 50.
  • the lower filter cartridge 30 comprises a filter wall 31 having a tubular conformation, in the present example toroidal, which delimits an internal cavity in which a usual support core 32 is inserted, provided with openings 33 for passage of the diesel.
  • the filter cartridge 30 further comprises two disc-shaped support plates, usually made of plastic, of which an upper support plate 34 and a lower support plate 35, which are coaxially attached to opposite end of the filter wall 31.
  • the lower support plate 35 closes the lower end the filter wall 3 .
  • the upper support plate 34 comprises a cylindrical shank 36, arranged coaxially to the filter wall 31 , which cylindrical shank 36 projects upwards and is fitted more or less snugly in a cylindrical shell 25 which is fixed to the cover
  • the filter cartridge 30 is removably fixed to the cover
  • the filter cartridge 30 might also be unremovably attached to the cover 22.
  • the upper support plate 34 exhibits a central through hole 38, located internally of the shank 36 suitable for setting the internal volume of the filter wall 31 in communication with the outlet conduit 24.
  • the shank 36 has a longitudinal development that is substantially equal to the longitudinal development of the filter wall 31.
  • cylindrical shank 36 axially prolongs, in an upwards direction in the figure, the support core 32 and therefore defines a passage conduit for the fluid filtered by the first filter wall 31 towards the outlet conduit 24.
  • the support candle 32 and the cylindrical shank 36 are advantageously associated to one another continuously with regard to the fluid crossing them.
  • the cylindrical shank 36 is derived (superiorly) directly from the upper support plate 34 of the first filter wall 31 and the support core 32 is fixed to or simply supported on the surface inferiorly of the upper support plate 34.
  • the lower filter cartridge 30 comprises at least a degassing conduit 40 fixed to the lower support plate 35, which degassing conduit 40 is suitable for placing the internal volume delimited by the filter wall 31 in communication with a volume that is external thereof.
  • the degassing conduit 40 comprises a cannula 41 exhibiting at least an access mouth 42 located at a higher level than the upper end of the filter wall 31 , i.e. the part of filter wall 31 which, in use, is the one arranged higher in the casing 20, such that the access mouth 42 is destined to be positioned internally of the casing 20 in an air (or other gas) storage zone that enters the casing together with the diesel.
  • the access mouth 42 can be located at a level that is slightly below or substantially equal with respect to the upper end of the filter wall 31 , i.e. the part of the filter wall 31 which, in use, is the part arranged higher in the casing 20.
  • the lower support plate 35 comprises a hollow connecting element 350 suitable for connecting the cannula 41 with the internal volume of the filter wall 31 , in practice the connecting element 350 defines an L-shaped tubular tract in the lower support plate 35 which exhibits a first horizontal tract, which develops radially from the peripheral end of the lower support plate 35 towards a central zone thereof, and a second vertical tract, which opens at the surface of the lower support plate 35, which faces towards the internal cavity of the filter wall 31.
  • the distal end 43 of the access mouth 42 is open and is associated substantially sealingly to the connecting element 350.
  • the distal end 43 of the cannula 41 is friction-inserted in the first horizontal tract of the connecting element 350 such that the connecting element 50 continuously extends the cannula 41 (and therefore the degassing conduit 40) towards the internal volume of the filter wall 31.
  • the cannula 41 is also substantially L-shaped and exhibits a horizontal tract 44, the free end of which is the distal end 43, and an elongate vertical tract 45 rising from the lower support plate 35 and extending towards the top of the casing 20 and exhibiting a longitudinal development that is substantially twice the longitudinal development of the filter wall 31.
  • the access mouth 42 of the cannula 41 which is afforded at the free and of the vertical tract 45 of the cannula, is located at a substantially same height as that of the free end of the cylindrical shank 36.
  • the degassing conduit 40 comprises at least a tract defining a choke zone 46 the passage hole of which is configured such that the pressure drop at the passage of gas upstream and downstream of the choke zone is greater than the pressure drop of the liquid upstream and downstream of the filter wall 3 .
  • the passage hole of the choke zone 46 is such as to guarantee a preferential passage for the air through the degassing conduit 40 and, at the same time, a preferential passage for the diesel through the filter wall 34 in any use condition of the filter group 10.
  • the choke zone 46 is realised with a choke element 47 associated to the degassing conduit 40, i.e. to at least one from between the cannula 41 and the connecting element 350.
  • the choke element 47 in the example, comprises a cylindrical body 470 provided with a passage cavity 471 , for example axial and tapered in the fluid passage direction, which terminates with an outlet mouth 472 defining the effective passage hole, smaller than the section of the cannula 41 , of the choke zone 46.
  • the cavity 471 may be cylindrical having a smaller diameter than the diameter of the cannula 41 , or it can exhibit other suitable form depending on constructional requirements.
  • the body 470 is associated to the degassing duct 40 at the distal end 43 of the cannula 41 and is inserted in the connecting element 350 substantially with a friction coupling such as to realise an extension of the horizontal section 44 of the cannula 41.
  • the body 470 and the horizontal tract 44 of the cannula 41 are aligned along the connecting element 350 and are joined together essentially continuously.
  • the body 470 can be associated to the degassing conduit 40 at the access mouth 42 of the cannula 41.
  • the choke zone 46 can also be realised by a crushing of the central area of the cannula 41 or using other technically equivalent means.
  • the filter cartridge 50 in turn comprises a tubular filter wall, 51 , in the present example a substantially toroidal shape, which delimits an internal through- cavity having a larger diameter than a diameter of the cylindrical shank 36, such as to be inserted with play thereon.
  • the filter cartridge 50 further comprises two hollow disc-shaped support plates, generally made of plastic, of which an upper support plate 52 and a lower support plate 53, which are coaxially fixed to the opposite ends of the filter wall 51.
  • Both the lower support plate 53 and the upper support plate 52 exhibits a central diameter hole that is greater with respect to the external diameter of the cylindrical shank 36.
  • a seal ring 54 is tightly coupled to the perimeter edge of the upper support plate -52,-which is perimeter edge slightly raised; the seal ring 54 is housed and comprised internally of a seating which is defined between the cover 22 and the beaker body 21 , such as to guarantee hermetic closing of the casing 20.
  • the filter cartridge 50 is positioned such that the filter wall 51 is coaxial to the filter wall 31 of the filter cartridge 30, and the lower support plate 53, in the first embodiment shown in figures 1-3, rests on the upper support plate 34.
  • the central hole of the lower support plate 53 is coaxially surrounded by an additional seal ring 55, which is received in a circumferential seating 56 afforded in the lower support plate 53 itself, on the surface that is facing towards the upper support plate 34 of the filter cartridge 30.
  • This seal ring 55 exhibits a greater thickness than a depth of the respective housing seating 56, such as to project therefrom along the whole circumferential development thereof.
  • a suitable radial play exists between the filter wall 51 and the cylindrical shank 36, which play defines an annular space for passage of the liquid to be filtered.
  • Hooking tabs 340 are defined on the upper support plate, which hooking tabs 340 are all identical and are arranged circumferentially about the axis of the filter walls 31 and 51 , at the base of the cylindrical shank 36, angularly equidistanced, such as overall to define a claw capable of inserting, practically snugly, in the central hole of the lower support plate 53 of the filter cartridge 50, retaining it restingly on the upper support plate 34.
  • each hooking tab 340 further comprises a tooth that projects radially externally, such as to prevent slippage of the filter cartridge 50.
  • the upper support plate 34 and the lower support plate 53, respectively of the first filter wall 31 and the second filter wall 51 can be fixed to one another, for example by means of gluing or another permanent or semipermanent fixing system.
  • the filter walls 31 and 51 are configured such as to be crossed in series by the diesel fuel, and sub-divide the internal volume of the casing 20 into three separate chambers, including: a first chamber 70, set in communication with the inlet conduits 23, which is defined superiorly of the upper plate support 52 of the first wall 51 and in the internal cavity of the filter wall 51 (the environments communicate through the central hole of the upper support plate 52 and any other holes afforded in it); a second chamber 71 defined in the internal cavity of the filter wall 31 and via the internal cavity of the cylindrical shank 36 extends up to and communicates with the outlet conduit 24; and an intermediate chamber 72 defined externally of both the filter walls 31 and 51.
  • the diesel fuel to be filtered originating from the inlet conduits 23 is first conveyed into the first chamber 70, such that the diesel fuel is forced to pass radially through the filter wall 51 from the inside towards the outside, in order to reach the intermediate chamber 72.
  • the diesel fuel is subjected to a first stage of filtration, generally called p re-filtration, in which it is separated from the larger impurities.
  • the filter wall 51 is preferably a depth filter made of synthetic fibre, which can retain a first part of the particulate present in diesel fuel, preferably more than 30% of the total amount of particulate present, and enables separation of almost the totality of the water that may be present in the fuel, performing an action of coalescence on the water droplets, which condense and collect by force of gravity on the base of the casing 20; the collected water can be periodically evacuated with suitable discharge means 60.
  • the degree of filtration (i.e. the size of the particulate for which the filter wall guarantees a 99% filtration efficiency) of the filter wall 51 can be between 5 and 100 ⁇ , and is preferably between 10 and 40 ⁇ .
  • the diesel fuel, coming from the intermediate chamber 72, is then forced radially through the filter wall 31 from the outside towards the inside, reaching the second chamber 71 and then the outlet conduit 24.
  • the diesel fuel is subjected to a second stage of filtration, generally called a fine filtration, in which is separated from impurities of smaller dimensions which were not retained by the filter wall 51 , and thus attains the desired degree of purity.
  • the filter wall 31 is preferably a pleated or star-shaped wall, with a degree of filtration that is generally higher than the filtration degree of the filter wall 51 , for example comprised between 0.5 and 20 ⁇ , and preferably between 1 and 10 pm, such as to define a pressure drop in the diesel fuel substantially comprised between 0.05 and 0.5 bar.
  • the pressure drop relates to a diesel fuel having a viscosity of 4-10 m 2 /s in standard operating conditions.
  • the filter cartridge 30 further comprises a hydrophobic net 39, made of PTFE (polytetrafluoroethylene) or a polymer treated with a hydrophobic substance, cylindrical in shape and located between the support plates 34 and 35 such as to internally wrap around the filter wall 31 , which filter wall 31 is suitable for separating any residual water still present in the diesel fuel.
  • a hydrophobic net 39 made of PTFE (polytetrafluoroethylene) or a polymer treated with a hydrophobic substance, cylindrical in shape and located between the support plates 34 and 35 such as to internally wrap around the filter wall 31 , which filter wall 31 is suitable for separating any residual water still present in the diesel fuel.
  • the free end of the cannula 41 is advantageously suitable for being arranged inferiorly of the peripheral portion of the upper support plate 52, such that the access mouth opens into the upper part of the intermediate chamber 72.
  • the degassing conduit 40 places the intermediate chamber 72 and the second chamber 71 is communication, guaranteeing degassing of the air and any other gases which might accumulate (substantially under pressure) in the upper portion of the casing 20 (in the zone underlying the upper plate 52) both during the start-up stage and under normal operating conditions of the filter group 10.
  • the outflow of air from the upper part of the casing 20 along the degassing conduit 40 towards the second chamber 71 is guaranteed by the positive pressure difference of the liquid upstream and downstream of the filter wall 31 (i.e. between the intermediate chamber 72 and the second chamber 71 ) which is created due to the presence of the filter wall 31 .
  • the passage hole of the choke zone 46 i.e. the outlet mouth 472
  • the fluid-dynamic load losses attributable thereto for the diesel fuel are much greater (for example 10 times) with respect to the fluid-dynamic load loss for the same diesel oil attributable to the filter wall 31 , the leakage of diesel fuel through the degassing conduit 40 is however contained, thus enabling a high-efficiency filter group 10 to be obtained.
  • the access mouth 42 of the degassing conduit 40 is located at the intermediate chamber 72 enables the diesel fuel which might pass through the degassing conduit itself, and the diesel fuel that has been previously filtered by the filter wall 51 , to pass through, contributing to a further improvement in the efficiency of the filter group 10.
  • the air in outlet from the degassing conduit 40 and entering into the second chamber is advantageously micronized, i.e. subdivided into microscopic bubbles, which mix with the diesel fuel filtered by the filter wall 31 and reduce the possibility that accumulations of air can be formed, which would cause unforeseen injections of large bubbles into the diesel fuel in delivery and which cause problems to the organs downstream of the filter group 10, in particular to the high-pressure pump and the injectors.
  • the free end of the cannula 41 in the illustrated example, is retained by a pin 57 associated to the lower surface of the upper support plate 52, which has the sole task of maintaining the cannula 41 in a stable position.
  • the access mouth 42 of the degassing conduit 40 might be arranged at the first chamber 70; in this case, the passage hole of the choke zone 46 is configured such that the pressure drop on the passage of liquid upstream and downstream of the choke zone 46 is greater than the pressure drop of the liquid between the first chamber 70 and the second chamber 71.
  • the filter assembly 10 might comprise usual sensor means 80 of the -presence of water, associated to - the bottom of the beaker body and extending internally of the casing 20 in the diesel fuel accumulation zone.
  • Figure 4 illustrates a second and alternative embodiment of the filter group 10; the reference numbers of the components of the filter group 10 in the second embodiment (figure 4) are the same as for the first embodiment (figures 1 -3) described in the preceding, as regard the common parts or the technical function.
  • the filter group 10 of the second embodiment differs from the above- described first embodiment essentially only in that the upper support plate 34 and the support plate 53 are realised in a single part defined by a disc body 500.
  • the disc body 500 exhibits two opposite surfaces, of which a lower wall (numbered with numeral 34, as it performs the same function as the upper support plate 34 illustrated in the first embodiment) to which the upper end of the first filter wall 31 is fixed as well as an upper wall (numbered with reference number 53, as it performs the same function as the lower support late 53 illustrated in the first embodiment) to which the lower end of the second filter wall 51 is fixed.
  • the cylindrical shank 36 is removably associated to the disc body 500.
  • cylindrical shank 36 is practically snugly inserted in the central opening of the disc body 500 by means of interposing an annular seal ring 360, which is inserted in an annular seating afforded in the cylindrical shank in proximity of the lower end thereof.
  • the upper end of the cylindrical shank 36 is associated to the outlet conduit 24, as described herein above in relation to the first embodiment.
  • cylindrical shank 36 axially prolongs the support core 32 of the first filter wall 31 , as with the first embodiment, internally of the internal cavity of the second filter wall 51 and defines, thus, a passage conduit for the fluid filtered towards the outlet conduit 24.
  • the support core 32 and the cylindrical shank 36 are advantageously associated to one another continuously, for example simply restingly, guaranteeing a simplicity of assembly and mounting of the filter cartridge 10.
  • the support core 32 and the cylindrical shank 36 could be realised in a single piece.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

La présente invention concerne une cartouche filtrante (30) comprenant : au moins une paroi filtrante (31) ayant une forme tubulaire et traversée par un liquide à filtrer ; au moins une plaque de support (34, 35) fixée à une extrémité de la paroi filtrante (31), au moins une conduite de dégazage (40) fixée à la plaque de support (35) appropriée pour établir une communication entre un volume interne délimité par la paroi filtrante (31) et un volume externe de celle-ci destinée au passage de l'air de l'extérieur vers l'intérieur de la paroi filtrante (31). La particularité de l'invention réside dans le fait que la conduite de dégazage (40) comprend une zone de rétrécissement (46), un orifice de passage qui est configuré de sorte qu'une perte de charge au niveau du passage du liquide en amont et en aval de la zone de rétrécissement (46) soit supérieure à une perte de charge du liquide en amont et en aval de la paroi filtrante (31).
PCT/IB2012/001759 2011-09-14 2012-09-10 Cartouche filtrante et groupe filtrant pour la cartouche WO2013038252A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201280044930.6A CN103998110B (zh) 2011-09-14 2012-09-10 滤芯和用于该滤芯的过滤器组

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRE2011A000068 2011-09-14
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WO2015102822A1 (fr) * 2014-01-02 2015-07-09 Caterpillar Inc. Élément filtrant ayant une double capacité de filtration et ensemble filtre
WO2015112370A1 (fr) * 2014-01-24 2015-07-30 Caterpillar Inc. Élément de filtre doté d'une partie couvercle et ensemble filtre
WO2015112520A1 (fr) * 2014-01-24 2015-07-30 Caterpillar Inc. Élément de filtre possédant un tube de mise à l'air et ensemble de filtre
WO2016087916A1 (fr) * 2014-12-01 2016-06-09 Ufi Filters S.P.A. Cartouche filtrante munie de moyens de drainage de l'eau et groupe de filtrage associé

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US10807026B2 (en) * 2015-10-16 2020-10-20 MANN+HUMMEL Filtration Technology US LLC Filter element with air-bleed conduit
JP6892279B2 (ja) * 2017-02-13 2021-06-23 ヤマシンフィルタ株式会社 フィルタ装置及び濾過装置
CN109653918A (zh) * 2019-02-13 2019-04-19 定远亿利过滤技术有限公司 一种分离式燃油滤清器滤芯

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Publication number Priority date Publication date Assignee Title
WO2015102822A1 (fr) * 2014-01-02 2015-07-09 Caterpillar Inc. Élément filtrant ayant une double capacité de filtration et ensemble filtre
WO2015112370A1 (fr) * 2014-01-24 2015-07-30 Caterpillar Inc. Élément de filtre doté d'une partie couvercle et ensemble filtre
WO2015112520A1 (fr) * 2014-01-24 2015-07-30 Caterpillar Inc. Élément de filtre possédant un tube de mise à l'air et ensemble de filtre
US9527016B2 (en) 2014-01-24 2016-12-27 Caterpillar Inc. Filter element having vent tube and filter assembly
US9527017B2 (en) 2014-01-24 2016-12-27 Caterpillar Inc. Filter element having cover portion and filter assembly
WO2016087916A1 (fr) * 2014-12-01 2016-06-09 Ufi Filters S.P.A. Cartouche filtrante munie de moyens de drainage de l'eau et groupe de filtrage associé
US10213713B2 (en) 2014-12-01 2019-02-26 Ufi Filters S.P.A. Filter cartridge provided with means for draining water and a relative filter group

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ITRE20110068A1 (it) 2013-03-15
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