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Title:
FILTER CARTRIDGE WITH ELECTRIC POWER SUPPLY MEANS
Document Type and Number:
WIPO Patent Application WO/2019/016714
Kind Code:
A1
Abstract:
A filter cartridge (1) of a fluid filtration assembly (900) which comprises a filter body (950) in which said cartridge (1) is housable extending along a main axis (X- X). The filter cartridge (1) comprises at least one end plate (2), a filter medium (3) axially extending around the main axis (X-X) from the end plate (2) having a tubular cylindrical shape and comprising at least one heating layer (30), electrically powered. In addition, the filter cartridge (1) comprises electric power supply means (5) comprising: - contact layer elements (50) comprising a first assembly (51) and a second assembly (52) respectively connected to the heating layer (30); - power supply elements (55), placed on the end plate (2), operatively connected to the contact layer elements (50). Said power supply elements (55) comprise at least one annular metal device (550) which extends around the main axis (X-X) which is electrically contactable in any angular position.

Inventors:
GIRONDI, Giorgio (Corso Trento 2, Ala Trento, I-38061, IT)
Application Number:
IB2018/055319
Publication Date:
January 24, 2019
Filing Date:
July 18, 2018
Export Citation:
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Assignee:
UFI INNOVATION CENTER S.R.L. (Corso Trento, 20 Ala, Trento, I-38061, IT)
International Classes:
B01D35/18; B01D29/15; F02M37/22
Foreign References:
US20140353236A12014-12-04
DE102014009323A12015-12-31
Attorney, Agent or Firm:
GAMBA, Alessandro et al. (Piazza della Vittoria 11, Brescia, I-25122, IT)
Download PDF:
Claims:
CLAIMS

1. A filter cartridge (1) of a fluid filtration assembly (900), preferably fuel, preferably diesel, housable in a filter body (950) of said filtration assembly (900), wherein the filter cartridge (1) extends along a main axis (X-X) and comprises:

i) at least one end plate (2) placed at an axial end of the filter cartridge (1), preferably having a through opening (20) through which the fluid flows;

ii) a filter medium (3) axially extending around the main axis (X-X) starting from the end plate (2) having a tubular cylindrical shape which is traversable by the fluid in the radial direction, wherein the filter medium (3) comprises at least one heating layer (30), electrically powerable, so as to be able to electrically adjust its temperature;

iii) electric power supply means (5) operatively connected to the heating layer (30) comprising:

- contact layer elements (50) operatively connected to the heating layer (30) comprising a first assembly (51) connected to the heating layer (30) and a second assembly (52) connected to the heating layer (30) which are electrically connectable to different electric poles;

- power supply elements (55), positioned on the end plate (2), operatively connected to the contact layer elements (50) and suitable to be contacted and powered electrically by electrical contacts present on the filter body (950) ;

wherein the power supply elements (55) comprise at least one annular metal device (550) which extends around the main axis (X-X) which is electrically contactable in any angular position to the main axis (X-X) which the filter cartridge (1) lies on.

2. Filter cartridge (1) according to claim 1, wherein the filter medium (3) is traversable radially from the outside to the inside and the heating layer (30) extends around the main axis (X-X) positioned on the outside of the filter medium (3) so as to be the first layer traversed by the fluid.

3. Filter cartridge (1) according to any of the preceding claims, wherein the first assembly (51) comprises a first contact ring (510) located on the heating layer (30) and a first elongated element (515) which extends from the power supply elements (55) to the first contact ring (510), wherein the second element (52) comprises a second contact ring (520) located on the heating layer (30) and a second elongated element (525) which extends from the power supply elements (55) to the second contact ring (520), wherein the first contact ring (510) is axially spaced from the second contact ring (520) .

4. Filter cartridge (1) according to claim 3, wherein the heating layer (30) is in non-woven fabric with electrically conductive fibres and the first contact ring (510) and the second contact ring (520) have respectively first and second gripping teeth (5100, 5200) having a radial extension to catch the heating layer (30) .

5. Filter cartridge (1) according to any of the preceding claims, wherein the power supply elements (55) comprise an annular metallic device (550) comprising a first portion (551) and a second portion (552) which are contactable respectively to a positive and a negative pole, wherein the first portion (551) is connected to the first assembly (51) and the second portion (552) is connected to the second assembly (52) .

6. Filter cartridge (1) according to claim 5, wherein the first portion (551) has an annular shape and the second portion (552) has an annular shape, wherein the first portion (551) and the second portion (552) extend concentrically to the main axis (X-X) mutually radially spaced.

7. Filter cartridge (1) according to claim 5, wherein the first portion (551) has the shape of the arc of a circle and the second portion (552) has the shape of the arc of a circle, wherein the first portion (551) and the second portion (552) extend angularly to the main axis (X-X) on the same circumference.

8. Filter cartridge (1) according to any of the claims from 1 to 4, wherein the power supply elements (55) comprise an annular metal device (550) contactable to an electric pole and an electric pin contactable to a second electric pole, wherein the annular metal device (550) is connected to the first assembly (51) and the electrical pin is connected to the second assembly (52) or vice versa .

9. Filter cartridge (1) according to any of the preceding claims, wherein the end plate (2) has a housing (200) made on the opposite side to that on which the filter medium (3) is connected, suitable to house the annular metal device (550), wherein the housing (200) extends circumferent ially to the main axis (X-X) and extends in height starting from the end plate (2) identifying an axial wall (250) suitable to support in height the annular metal device (550) .

10. Filter cartridge (1) according to any of the preceding claims wherein the heating layer (30) is placed in the filter medium (3) so as to be the first layer traversed by the fluid in the radial direction.

11. A filter body (950) of a fluid filtration assembly (900), preferably fuel, preferably diesel, suitable to house a filter cartridge (1) according to any of the preceding claims, wherein the filter body (950) comprises electric contacts (955) suitable for contacting and electrically powering the power supply elements (55) .

12. A filter body (950) according to claim 11 in combination with one of the claims from 4 to 6, wherein the electric contacts (955) comprise a first fixed pin (9551), placed at a predetermined angular position with respect to the main axis (X-X) of the filter body (950) and a second fixed pin (9552), placed at a predetermined angular position with respect to the main axis (X-X) of the filter body (950), connected to different electric poles, specially shaped to contact the annular metal device (550) .

13. Filter body (950) according to claim 11 in combination with claim 7, wherein the electric contacts

(955) comprise a fixed pin and a fixed annular metal device, connected to different electric poles, wherein the fixed pin is specially shaped to contact the annular metal device (550) while the fixed annular metal device is suitable to be contacted by the electric pin.

14. Filter body (950) according to claims 12 and 13 in combination with claim 9, wherein the engagement between the pin and the annular metal device is performed in the radial direction to the main axis (X-X) .

15. Filter body (950) according to any of the claims from 11 to 14, comprising a closing portion (951) and a support portion (952) mutually attachable, preferably by screwing, defining the cartridge housing (950') in which the filter cartridge (1) is insertable, wherein the support portion (952) houses the electric contacts.

16. Filtration assembly (900) comprising:

- a filter body (950) according to any of the claims from 11 to 15; and

- a filter cartridge (1) according to any of the claims from 1 to 10.

17. Assembly method of a filtration assembly (900), according to claim 16 in combination with claim 14, comprising the steps of:

- inserting the filter cartridge (1) in the closing portion (951) so as to block the filter cartridge to the closing portion (951);

-fixing, preferably by screwing, the closing portion (951), housing the filter cartridge (1), to the support portion ( 952 ) .

Description:
DESCRIPTION

"FILTER CARTRIDGE WITH ELECTRIC POWER SUPPLY MEANS"

Field of application

[0001] The present invention relates to a filter cartridge for a fluid filtration assembly and a filter body of a fluid filtration assembly suitable to house said filter cartridge. In addition, the present invention relates to a fluid filtration assembly which comprises both the filter body and the filter cartridge. Lastly, the present invention also relates to the assembly method of said filtration assembly.

[0002] The present invention finds specific application in the automotive field. Specifically, in fact, the context which the present invention lies in is that filtration assemblies of fluid whose the viscosity is influenceable by the working temperature. For example, preferably, filtration assemblies are known of suitable to perform the filtration of fuel, preferably of the diesel type, in order to separate the fuel from suspended particles, but also from aqueous particles. Or again, in the automotive field, filtration assemblies suitable to filter blow-by gas, oil, urea or air are known.

[0003] The main problem in the filtration of fluids and in particular of diesel fuel is the more or less sudden accumulation of impurities on the first layer of the filter body crossed by the fluid. Obviously, said accumulation of impurities results in a clogging of the filter body which affects its functioning.

[0004] This situation is particularly felt when the fluid is at low temperatures (e.g. when turning on the engine, or in extremely cold weather conditions) and contains a high quantity of crystals: for example in diesel fuel paraffin crystals are present; in aqueous fluids, such as urea, ice crystals are present; in gaseous fluids, such as blow-by gasses or ambient air, drops and/or crystals of condensate are present.

[0005] In order to overcome this problem, in the prior art it is known of to warm the fuel, or more generally the working fluid, reducing or avoiding the accumulation of paraffin crystals or, in general, of ice or condensate. Filtration assembly solutions are in fact provided in which the filter medium comprises a heating layer, preferably electric, the temperature of which is electrically activated when necessary so as to dissolve the crystals of paraffin and avoid the clogging described above .

[0006] The main problem afflicting such filter cartridge solutions is that of effectively bring the power supply to the heating layer in order to achieve effective and uniform heating. [0007] Typically, this need involves the design and production of filter cartridges with particularly complex geometries .

[0008] For example filter cartridges with special heating cages or skirts, comprising a network of electrical wires, surrounded the filter medium, are known.

[0009] Or again filter cartridges in which at least one filter cartridge end plate has electrical contacts suitable to be contacted by suitable power supply means are known: in other words, the cartridge and the filter body of the filtration assembly are mutually operatively connected with a socket-plug coupling that works exclusively with a single reciprocal position of the cartridge and filter body.

[0010] One example of an embodiment of a filtration assembly having such drawbacks is illustrated in the document EP2811147. A further example of an embodiment of a filtration assembly having such drawbacks is illustrated in the document WO2017/11525 in the name of the same applicant.

Solution according to the invention

[0011] The need is therefore strongly felt to make available a filter cartridge with a heating layer which can be electrically powered with a simple geometry, but above all with electric power supply means which are simple to electrically connect.

[0012] The purpose of the present invention is to provide a filter cartridge, a filter body suitable to contain said filter cartridge and a filtration assembly in which the aforesaid need is satisfied and which also responds efficiently and effectively to the needs of the specific sphere of application.

[0013] Such purpose is achieved by the filter cartridge claimed in claim 1, by a filter body according to claim 10 and by a filtration assembly according to claim 16. In addition, such purpose is also achieved by an assembly method of a filtration assembly according to claim 17. The dependent claims show preferred embodiment variants having further advantageous aspects.

Description of the drawings

[0014] Further characteristics and advantages of the invention will, in any case, be evident from the description given below of its preferred embodiments, made by way of a non-limiting example with reference to the appended drawings, wherein:

- figure 1 shows a perspective view of the filtration assembly of the present invention, according to a preferred embodiment;

- figure la shows a longitudinal cross-section of the filtration assembly shown in figure 1; - figures la' and la" show two enlarged longitudinal cross-section views of the filtration assembly in figure la;

- figure 2a shows a longitudinal cross-section view of the filtration assembly shown in figure 1, during an assembly/disassembly operation;

- figure 2a' shows an enlarged longitudinal cross-section of the filtration assembly shown in figure 2a;

- figure 3 shows a longitudinal cross-section in separate parts of the filtration assembly shown in figure 1;

-figure 4 shows a perspective view of a filter cartridge according to the present invention, according to a preferred embodiment;

- figure 4a shows a perspective view in separate parts of the filter cartridge shown in figure 4;

- figures 5a and 5bc show two, perpendicular, side and top views of the filter cartridge in figure 4, in an assembled configuration;

- figures 6a and 6a' show two longitudinal cross-section views of the filter cartridge in figure 4.

Detailed description

[0015] In the appended drawings, reference numeral 1 globally denotes a filter cartridge according to the present invention, in a preferred embodiment. Similarly, in the appended drawings reference numeral 900 denotes a filtration assembly of a fluid, preferably fuel, preferably diesel, which the present invention in turn relates to according to a preferred embodiment. In addition, again in accordance with the present invention, reference numeral 950 denotes the filter body of the filtration assembly 900 according to a preferred embodiment .

[0016] The present invention relates to a filter cartridge

1 of a fluid filtration assembly 900 which is housable in a filter body 950 of said filtration assembly 900.

[0017] Said filter cartridge 1 extends along a main axis X- X comprising a filter medium 3 and at least one end plate

2 placed at an axial end of the filter medium 3. Preferably, the filter cartridge comprises two end plates placed at opposite ends of the filter medium 3: a first end plate 21 (preferably, the bottom end plate) and a second end plate 22 (preferably, the top end plate) .

[0018] The filter cartridge 1 comprises, as said, at least one end plate 2 placed at an axial end of the filter cartridge 1 having a through opening 20 through which the fluid flows. As shown in the appended drawings, the end plate 2 with the through opening 20 is preferably the second end plate 22. Preferably, through this second end plate 22, the filter cartridge 1 cooperates directly with the filter body 950 (preferably, with its support portion 952) via the through opening 20 in such a way as to have the filter medium in fluidic connection with the circulation system of the liquid, i.e. fuel. According to such preferred embodiment, the first end plate 21 is instead suitable to engage the filter body 950 (the closing portion thereof 951) .

[0019] In the case of a fuel filter, for example, the end plate 21 houses a lower gasket 210 suitable to sealingly engage the walls of the filter body 950 to delimit a water collection chamber in the filtration assembly 900.

[0020] The filter medium 3 extends axially around the main axis X-X starting from said end plate 2 having a cylindrical tubular shape, identifying a central cavity 300. The filter medium 3, in fact, is traversable by the fluid in the radial direction. Preferably, the filter medium 3 operates in the radial direction from the outside to the inside.

[0021] In the case of a fuel filter, for example, the filter medium 3 radially presents layers with different physical characteristics, for example the first layers are suitable to filter out suspended solids, while the other layers are instead suitable to separate water particles .

[0022] In particular, the filter medium 3 comprises at least one heating layer 30, electrically powerable or powered, so as to be able to adjust the temperature. In a preferred embodiment, said heating layer 30 is the first layer intercepted by the liquid to be filtered. According to a preferred embodiment, the filter is passed through radially from the outside to the inside and the heating layer 30 is placed and/or made on the outer surface of the filter medium 3. In practice, the heating layer faces the entrance chamber of the fluid to be filtered.

[0023] Specifically, in fact, the filter cartridge 1 of the present invention also comprises electric power supply means 5 operatively connected to the heating layer 30. According to a preferred embodiment the heating layer 30 is in a non-woven fabric with electrically conductive fibres .

[0024] For example, the heating layer 30 is in a polymer fibre material containing within it conductive fibres. Preferably, said conductive fibres are in silver.

[0025] Such electric power supply means 5 comprise contact layer elements 50 operatively connected to the heating layer 30.

[0026] Specifically, the contact layer elements 50 comprise a first assembly 51 connected to the heating layer 30 and a second assembly 52 connected to the heating layer 30 which are electrically connectable to different electric poles. The connection of the contact layer elements 50 to different electric poles allows the electric current to circulate in the heating layer and the production of heat by the Joule effect. The heat thus generated is used to dissolve crystals of paraffin or ice carried by the working fluid and/or accumulated on the surface or in the volume of the filter medium.

[0027] In fact, the power supply means 5 comprise power supply elements 55, positioned on the end plate 2, operatively connected to the contact layer elements 50 and suitable to be contacted and powered electrically by electrical contacts present on the filter body 950; specifically, these power supply elements 55 are electrically connected to different electrical poles.

[0028] The filter cartridge 1 has said power supply elements 55 in a manner such as to comprise at least one annular metal device 550 which extends around the main axis X-X.

[0029] Such annular metallic device 550 is electrically contactable at any angular position with respect to the main axis X-X which the filter cartridge 1 lies on. In other words, the electric power supply to the annular metal device 550 and thus to the contact layer elements 50 is guaranteed whatever the angular position of the filter cartridge 1 inside the filter body 950. According to a preferred embodiment, the first assembly 51 comprises a first contact ring 510 located on the heating layer 30 and a first elongated element 515 which extends from the power supply elements 55 to the first contact ring 510.

[0030] According to a preferred embodiment, said first contact ring 510 is blockable in an annular manner on the filter medium 3. Preferably, the first contact ring 510 works like a "clamp/crimp band". According to a preferred embodiment, said first contact ring 510 is blockable in an annular manner on the heating layer 30.

[0031] According to the embodiment shown in the appended drawings, the first contact ring 510 is made of sheet metal, in a conductive material. Preferably, the first elongated element 515 is also made of sheet metal in a conductive material.

[0032] According to a preferred embodiment, wherein the heating layer 30 is in non-woven fabric the contact ring 510 has first gripping teeth 5100 having a radial extension to catch the heating layer 30. Preferably, these gripping teeth 5100 are such as to extend radially so as to impale the heating layer 30 ensuring electrical contact and maintaining the axial position of the first contact ring 510 on it.

[0033] According to a preferred embodiment, the second element 52 comprises a second contact ring 520 located on the heating layer 30 and a second elongated element 525 which extends from the power supply elements 55 to the second contact ring 520.

[0034] As described with reference to the first assembly 51, the second assembly 52 also presents said second contact ring 520 which is blockable in an annular manner onto the filter medium 3. Preferably, the second contact ring 520 has a similar function to that of a "clamp/crimp band". According to a preferred embodiment, said second contact ring 520 is blockable in an annular manner on the heating layer 30.

[0035] According to the embodiment shown in the appended drawings, the second contact ring 520 is made of sheet metal, in a conductive material. In a preferred embodiment, the second elongated element 525 is also made of sheet metal in a conductive material.

[0036] However, both the first elongated element 515 and the second elongated element 525 can be electric cables or general conductor tracks suitable to place in electrical connection the electric power supply elements 55 with the aforesaid contact rings 510, 520.

[0037] In particular, according to a preferred embodiment which provides for the heating layer 30 in non-woven fabric, the second contact ring 520 has second gripping teeth 5200 having a radial extension to catch the heating layer 30. Preferably, these gripping teeth 5200 are such as to extend radially so as to impale the heating layer 30 ensuring electrical contact and maintaining the axial position of the second contact ring 520 on it.

[0038] According to a preferred embodiment, the first contact ring 510 is axially spaced from the second contact ring 520. Preferably, the first contact ring 510 and the second contact ring 520 are positioned in proximity of the axial ends of the heating layer 30. Preferably, the first contact ring 510 and the second contact ring 520 are positioned in proximity of the first end plate 21 and the second end plate 22.

[0039] According to a preferred embodiment, the second assembly 52 comprises an electrical insulating element 529 suitable to electrically insulate a possible contact between the heating layer 30 and the second elongated element 525. Preferably it is foreseeable that the first assembly 51 also comprises a similar insulating element.

[0040] In accordance with the present invention multiple embodiments of the power supply element 55 are provided for .

[0041] In particular, the described annular metal device 550, comprised in the power supply elements 55, comprises a first portion 551 and a second portion 552 that are respectively contactable to a positive and a negative pole. The first portion 551 is connected to the first assembly 51 and the second portion 552 is connected to the second assembly 52.

[0042] According to a preferred embodiment, the first portion 551 has an annular shape and the second portion 552 has an annular shape, wherein the first portion 551 and the second portion 552 extend concentrically to the main axis X-X mutually radially spaced.

[0043] In other words, the metal annular device 55 comprises two concentric rings engageable by special electric contacts 955, such as to respectively engage the two rings in turn being arranged at different radial distances, provided on the filter body as described below. Such embodiment is in fact that widely shown in the appended figures.

[0044] According to a preferred embodiment, the metal annular device 55 comprises two concentric rings 551, 552 made in the form of thin conductive sheets and oriented so as to direct the largest portion of the respective lamina towards the electric contacts provided on the filter body.

[0045] One embodiment variant, however, provides for the first portion 551 having the shape of an arc of a circle and the second portion 552 having the shape of an arc of a circle. Preferably, the first portion 551 and the second portion 552 extend angularly with respect to the main axis X-X on the same circumference.

[0046] In other words, the annular metal device 55 comprises a single concentric ring composed of a first portion and a second portion respectively engaged by specific electric contacts 955, such as to respectively engage the two portions arranged at the same radial distance, but angularly spaced, provided on the filter body as described below.

[0047] According to this embodiment variant, the annular metal device 55 comprises a first portion and a second portion aligned along the same circumference and made in the form of thin conductive sheets and oriented so as to direct the largest portion of the respective lamina towards the electrical contacts provided on the filter body .

[0048] A further embodiment variant instead provides that the electric power supply elements 55 comprise the annular metal device 550 which is contactable to an electric pole and an electric pin contactable to a second electric pole. That is to say that the annular metal device 550 is connected to the first assembly 51 and the electrical pin is connected to the second assembly 52 or vice versa.

[0049] In other words, this way the power supply elements 55 are contacted by specific electric contacts 955 provided on the filter body 950 a fixed annular device engageable by the aforesaid electric pin and a specific electrical contact device suitable instead to contact the annular metal device 550.

[0050] According to the aforementioned preferred embodiments, the end plate 2 has a housing 200 made on the opposite side to that to which the filter medium 3 is connected, suitable to house the annular metal device 550.

[0051] In particular, the housing 200 extends circumferentially to the main axis X-X and extends in height, preferably at right angles, starting from the end plate 2 identifying an axial wall 250.

[0052] Preferably, said circumferential wall is suitable to support in height the annular metal device 550.

[0053] Depending on the types of annular metal device 550, the axial wall 250 presents a first axial wall 251 and a second axial wall 252 respectively suitable to axially and circumferentially support the first portion 551 and the second portion 552 of the annular metal device 550. For example, the first axial wall 251 and the second axial wall 252 are placed circumferentially concentric to the axis X-X on different radii. Or, the first axial wall 251 and the second axial wall 252 are set at the same radius from the axis X-X.

[0054] As shown in the appended figures, the housing 200 and in particular the axial walls are not defined circumferentially seamlessly, but are defined by a plurality of ribs extending at right angles from the end plate 2 to support, in points, the annular metal device 550.

[0055] Preferably, according to the above description, it is to be noted the annular metal device 550 consists of one or more conductive metal sheets. According to a preferred embodiment, said metal sheets are suitable to perform an elastic radial action on the walls defining the housing 200.

[0056] The present invention also relates to a filter body 950 of a fluid filtration assembly suitable to house a filter cartridge 1 having the characteristics described above .

[0057] Preferably, as said, the filter body 950 comprises electric contacts 955 suitable to contact and electrically power the power supply elements 55.

[0058] In other words, the filter body 950 has a heating group 9520 presenting electric contacts 955 suitable to contact the filter cartridge 1 to electrically power the heating layer 30 depending on the operating needs of the filtration assembly 900, i.e. according to the needs of the vehicle containing it.

[0059] Said heating group 9520 is electrically connected to a main connector 970 with which the filtration assembly 900 is connected to the control unit, or to a general drive installed on board the vehicle, suitable to provide a difference of potential between the electric contacts 955.

[0060] According to a preferred embodiment, the electric contacts 955 comprise a first fixed pin 9551, placed at a predetermined angular position with respect to the main X-X of the filter body 950 and a second fixed pin 9552, placed at a predetermined angular position with respect to the main axis X-X of the filter body 950, connected to different electrical poles, specially shaped to contact the annular metal device 550.

[0061] Said fixed pins are placed on the filter body 950 depending on the embodiment of the annular metal device 550; that is to say that in the embodiment with two concentric metal rings the pins are in turn radially spaced from the main axis X-X on different radii, while in the embodiment with a single metal ring the pins are placed at the same distance.

[0062] In contrast, however, in the embodiment in which the filter cartridge 1 comprises an annular metal device 550 and an electric pin, the filter body 950 comprises said electric contacts 955 having in turn a fixed pin and a fixed metal annular device, connected to different electric poles, specially shaped to contact the annular metal device 550 and the electric pin.

[0063] According to a preferred embodiment, moreover, the engagement between the pin of the filter body 950 and annular metal device 550 is in a radial direction to the main axis X-X. In fact, the engagement between the cartridge 1 and the filter body 950 takes place substantially in the axial direction, but the electrical contact is performed in the radial direction. That is to say the fixed pins are suitable to perform a radial thrust action on the annular metal device 550 resting on the axial walls 220 of the housing 200.

[0064] Preferably, the fixed pins are configured as elastically yielding elements. Preferably, the fixed pins are configured as yielding elements in a radial direction. Preferably, with respect to the axis X-X of the filter cartridge 1, the fixed pins are configured in such a way as to be elastically radially yielding.

[0065] According to a preferred embodiment of the filter body 950 this comprises a closing portion 951 and a support portion 952 which are mutually fixable, for example by screwing, defining the cartridge housing 950' in which the filter cartridge 1 is insertable. Preferably in said support portion 952 the aforementioned electric contacts are housed.

[0066] In other words, preferably the bottom end plate 21 is specifically shaped to engage the closing portion 951, while the top end plate 22 is specifically shaped to engage the support portion 952. According to a preferred embodiment, the first end plate 21 is fitted with special clamping means suitable to integrally engage the closing portion 951 in such a way as to prevent unwanted related movements between the two components.

[0067] The present invention also relates to a filtration assembly 900 which comprises a filter body 950 having the described characteristics and a filter cartridge having the described characteristics.

[0068] The filtration assembly 900 of the present invention is extendable in a general sense to assemblies comprising a closing portion fixable in a removable manner to a support portion to delimit the inner volume in which the filter cartridge having the characteristics described above is installed.

[0069] Advantageously, the solution is equally applicable to filtration assemblies with a longitudinal axis X-X oriented vertically, or slightly tilted, wherein the closing portion is directed downwards, and filtration assemblies with a longitudinal axis X-X oriented vertically, or slightly tilted, wherein the closing portion is pointing upwards and to filtration assemblies with a longitudinal axis X-X oriented horizontally.

[0070] In addition, the present invention also relates to an assembly method of a filtration assembly 900 according to the above; such method comprises the steps of:

- inserting the filter cartridge 1 in the closing portion 951 so as to lock the filter cartridge to the closing portion 951;

- fixing, preferably by screwing, the closing portion

951, housing the filter cartridge 1, to the support portion 952.

[0071] Depending on the different embodiments described above, during this attachment step of the closing portion 951 housing the filter cartridge 1 to the support portion

952, the electric power supply means on the cartridge 5 are suitable to be engaged by respective electrical contacts 955 on the filter body 950. Preferably, in the case of screw attachment, the perpendicular height to the surface of the end plate 2 of the annular metal device 550 is a multiple of the thread pitch. Preferably, the annular metal device 550 extends in height two/three times the thread pitch. Preferably, the electrical contact is guaranteed in the radial direction between the pin and annular metallic device 550 even if the closing portion 951 and support portion 952 are not completely mutually screwed together.

[0072] Innovatively, the filter cartridge, filter body and filtration assembly described above fully achieve the purpose of the present invention overcoming the drawbacks typical of the prior art.

[0073] Advantageously, in fact, the power supply is brought to the filter cartridge in a simple and intuitive manner. Specifically, in fact, thanks to the electric power supply means comprised on the cartridge and to the electric contacts comprised in the filter body the contact is guaranteed whatever the angular position of the filter cartridge with regard to the filter body.

[0074] A further advantage is that the electrical contact is made using a radial engagement between the components involved in such a way as to overcome any differences and geometric variations in the axial direction.

[0075] Advantageously, the engagement in the radial direction ensures a stable electric contact able to withstand any pressure shocks and/or vibrations due to normal operation of the filter.

[0076] Advantageously, the combination of an axial insertion between cartridge and filter body and a radial engagement between the electrical contacts makes it possible to obtain a self-centring, electric coupling, further improved by exploiting any accompanying surfaces integrated on the housing.

[0077] Advantageously the heating layer is electrically powered easily and securely.

[0078] Advantageously, the use of annular shaped contact layer elements, configured as "clamp/crimp bands" improves the stability and reliability of the electric contact while simplifying the production process of the filter cartridge.

[0079] Advantageously, the arrangement and/or positioning of the heating layer on the outer surface of the medium makes it possible to increase the heating surface and increase the heating efficiency of the heating system. Advantageously, the use of contact layer elements electrically connected to the heating layer and electric power supply elements positioned on the same end plate makes it possible to adapt the power supply system described to filter cartridges of different sizes and/or filtration assemblies with different installation orientations.

[0080] Advantageously, the use of contact layer elements connected to electric power supply elements by means of elongated elements arranged outside the filter medium simplifies the contact of the heating layer with the electric contacts provided on the casing of the filtration unit.

[0081] Advantageously in the embodiment in which the heating layer is in a non-woven fabric its electric contact is assured and spread over it circumferentially .

[0082] A further advantage is the simple structure of the filter cartridge, which in a simple and compact manner fully responds to the demands of the sector. Specifically, the filter cartridge has no external electric cages or skirts. As described the electric power supply is brought directly to the heating layer included in the filter medium.

[0083] Advantageously, the assembly method of the cartridge assembly requires no special operations but only the execution of simple operations, namely the blocking of the filter cartridge to the closing portion and the securing of the assembly thus obtained without worrying about anything else. Advantageously therefore the maintenance operations of the filtration assembly involving replacing the filter cartridge are extremely simplified and fool-proof.

[0084] In addition, advantageously, the filter cartridge is also usable in filtration assemblies in which it is placed, controlled in a rotary movement around the main axis X-X advantageously firmly maintaining the electrical contact in the radial direction. [0085] It is clear that a person skilled in the art may make modifications to the filter cartridge, filter body and filtration assembly described above so as to satisfy contingent requirements, all contained within the scope of protection as defined by the following claims.

List of reference numbers:

1 filter cartridge

X-X main axis

2 end plate

20 through opening

21 first end plate

210 bottom seal

22 second end plate

200 housing

250 axial wall

251 first axial wall

252 second axial wall

3 filter medium

30 heating layer

300 central cavity

5 electric power supply

50 contact layer elements

51 first assembly

510 first contact ring

5100 first gripping teeth 515 first elongated element

52 second assembly

520 second elongated ring

5200 second gripping teeth

525 second elongated element

529 electric insulation element

55 electric power supply elements

550 annular metal device

551 first portion

552 second portion

900 filtration assembly

950 filter body

950' cartridge housing

951 closing portion

952 support portion

9520 heater group

955 electric contacts

9551 first fixed pin

9552 second fixed pin

970 main connector