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Title:
CARTRIDGE FOR FILTRATION AND DEHYDRATION OF FLUID
Document Type and Number:
WIPO Patent Application WO/2013/001429
Kind Code:
A1
Abstract:
The invention concerns a cartridge for filtration and dehydration of fluid comprising a support (7) configured to be mounted in a conveying pipe (2), a filter member (9) disposed within said support (7), a dehydrating member (10) configured to be mounted in said pipe (2), said support (7) being configured to hold said dehydrating member (10) in said pipe (2) relative to said filter member (9) and having a body (28) extending in a longitudinal direction and provided with an end wall and at least one lateral wall (32, 33) which delimit an internal space of said body (7) and a holding member (29) which projects from said end wall and which extends in said internal space in said longitudinal direction until it emerges by a free end (51) from said internal space, said dehydrating member (10) being configured to be linked to said free end (51).

Inventors:
COUTY FRANCK (FR)
Application Number:
PCT/IB2012/053171
Publication Date:
January 03, 2013
Filing Date:
June 22, 2012
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
FILTERTEK (FR)
COUTY FRANCK (FR)
International Classes:
B01D53/26; F25B43/00
Domestic Patent References:
WO2006016761A12006-02-16
Foreign References:
DE102005005186A12006-08-10
US20060070724A12006-04-06
EP1477750A12004-11-17
US6170288B12001-01-09
Other References:
None
Download PDF:
Claims:
CLAIMS

1 . A cartridge for filtration and dehydration of fluid passing through it, in particular for air conditioning of automotive vehicles, comprising a support (7) configured to be mounted in a pipe (2) for conveying said fluid, a filter member (9) disposed within said support (7), a dehydrating member (10) distinct from said filter member (9) and from said support (7) and configured to be mounted in said pipe (2), said support (7) being configured to hold said dehydrating member (10) in said pipe (2) relative to said filter member (9);

characterized in that said support (7) has:

- a body (28) extending in a longitudinal direction and provided with an end wall (31 ) and at least one lateral wall (32, 33) which delimit an internal space (8) of said body (7), said filter member (9) being configured to be inserted into said internal space (8); and

- a holding member (29) for said dehydrating member (10) which projects from said end wall (31 ) of said body (28) and which extends in said internal space (8) of said body (28) in said longitudinal direction until it emerges by a free end (51 ) from said internal space (8), said dehydrating member (10) being configured to be linked to said free end (51 ).

2. A cartridge according to claim 1 , characterized in that said support (7) is a one-piece plastics molding.

3. A cartridge according to one of claims 1 and 2, characterized in that said holding member (29) projects from said end wall (31 ) of said body (28) by a main portion (47) of a plastics material in which are conjointly formed said holding member (29) and said body (28).

4. A cartridge according to any one of claims 1 to 3, characterized in that, the general cross-section of said holding member (29) is in the shape of a cross formed by a main portion (47) and two ribs (48) projecting from respective opposite sides of said main portion (47), said main portion (47) and said ribs (48) extending in said internal space (8) of said body (28) from said end wall (31 ) until they emerge from said internal space (8).

5. A cartridge according to any one of claims 1 to 4, characterized in that, said holding member (29) projects from a central portion of said end wall (31 ) of said body (28).

6. A cartridge according to any one of claims 1 to 5, characterized in that, said holding member (29) has a hook (49) at said free end (51 ) for holding and suspending said dehydrating member (10).

7. A cartridge according to claim 6, characterized in that said hook (49) has a cut-out configured to enable the passage of an anchoring lug (24) of the dehydrating member (10) as well as a non-return portion (50) partially obturating said cut-out to prevent the withdrawal of said dehydrating member (10) without the application of an external force.

8. A cartridge according to any one of claims 1 to 7, characterized in that, said body (28) is of cylindrical general shape.

9. A cartridge according to claim 8, characterized in that said holding member (29) extends centrally within said cylindrical body (28).

10. A cartridge according to any one of claims 1 to 9, characterized in that, said body (28) has a first lateral wall (32) at a first end, a second lateral wall (33) at a second end which is an opposite end to said first end and a frame (34) meeting said first lateral wall (32) and said second lateral wall (33).

1 1 . A cartridge according to claim 10, characterized in that said frame (34) has a plurality of first rods (35) meeting said first and second lateral walls (32, 33) and a plurality of second rods (36) crossing said first rods (35) to form a grid provided with a plurality of windows (37) between said first and second rods (35, 36).

12. A cartridge according to one of claims 10 and 1 1 , characterized in that said body (28) furthermore has at least one tooth (39) configured as a projection from said second lateral wall (33) and extending in said longitudinal direction and said holding member (29) extends beyond said at least one tooth (39).

13. A cartridge according to any one of claims 10 to 12, characterized in that at least one of said first and second lateral walls (31 , 32) is provided with at least one device (42) for fastening said cartridge (3) in said pipe (2).

14. A cartridge according to any one of claims 10 to 12, characterized in that at least one of said first and second lateral walls (31 , 32) is provided with at least one sealing device (43) configured to enter into contact with an inside face (46) of said pipe (2).

15. An air conditioning system for automotive vehicles comprising a closed circuit for circulation of a refrigerant fluid, which circuit is formed by a main pipe (2) in which said fluid circulates and a cartridge (3) according to any one of claims 1 to 14 disposed in said pipe (2) and configured to be passed through by said fluid.

Description:
CARTRIDGE FOR FILTRATION AND DEHYDRATION OF FLUID

The invention concerns cartridges for filtration and dehydration of fluids passing through them, and in particular refrigerant fluids for air conditioning systems of automotive vehicles, as well as the air conditioning systems provided with such cartridges.

It is known that air conditioning systems of automotive vehicles comprise a closed circuit with which are associated certain mechanical components, in particular such as a compressor, a condenser, an expansion device and an evaporator.

In the closed circuit there circulates a refrigerant fluid (also called refrigerant) configured to cool the air before that air is ventilated into the vehicle; and the fluid used for this needs to be filtered and dehydrated.

To be precise, that fluid may transport water which, if it mixes with the fluid when it is cold, may turn into ice and risk damaging the compressor and/or the expansion device.

The dehydration, in other words the elimination of moisture remaining in that fluid, also enables corrosive effects to be avoided which may also damage the compressor and/or the evaporator and/or the condenser.

Furthermore, the refrigerant fluid may carry impurities, for example oil coming for example from the compressor, which impurities must be stopped before the fluid reaches the condenser, failing which they would risk damaging it.

It is for this reason that a filtering and dehydrating cartridge is generally introduced into the air conditioning system, in the passage of the fluid.

Cartridges for filtration and dehydration of fluids passing through them are already known, in particular for fluids for air conditioning systems, comprising a support configured to be mounted in a pipe for conveying that fluid, a filter member disposed within the support and a dehydrating member distinct from the filter member and from the support and mounted in that pipe. The filter member is configured to retain impurities possibly present in the refrigerant fluid and the dehydrating member is configured to absorb moisture possibly present in that fluid.

The support is furthermore configured to hold the dehydrating member in the conveying pipe relative to the filter member.

The invention aims to provide a cartridge for filtration and dehydration of the same type, that is particularly simple, convenient and economic.

According to a first aspect, the invention therefore relates to a cartridge for filtration and dehydration of fluid passing through it, in particular for air conditioning of automotive vehicles, comprising a support configured to be mounted in a pipe for conveying said fluid, a filter member disposed within said support, a dehydrating member distinct from said filter member and from said support and configured to be mounted in said pipe, said support being configured to hold said dehydrating member in said pipe relative to said filter member;

characterized in that said support has:

- a body extending in a longitudinal direction and provided with an end wall and at least one lateral wall which delimit an internal space of said body, said filter member being configured to be inserted into said internal space; and

- a holding member for said dehydrating member which projects from said end wall of said body and which extends in said internal space of said body in said longitudinal direction until it emerges by a free end from said internal space, said dehydrating member being configured to be linked to said free end.

The cartridge for filtration and dehydration according to the invention is thus of a particularly simple and convenient design since it is provided with a single support having a body in the internal space of which is mounted the filter member as well as a holding member crossing the internal space of the body over its full length and beyond since the holding member emerges by a free end from said internal space of that body; whereby it is particularly convenient to dispose the dehydrating member (linked to the free end of the holding member) in a specific position without being hindered by the support body. More particularly, since the holding member projects from the end wall of the body, there is no hindering member at the free end of the support body, such as arms disposed between the holding member and the periphery of the body at the location of its free end.

Thanks to the invention, the cartridge formed by the support, the filter member and the dehydrating member may be securely disposed inside the pipe for conveying the fluid, in a long-term arrangement in which the fluid which is generally under pressure first of all enters into contact with the dehydrating member held by the holding member relative to the filter member, the fluid then being conveyed within the internal space of the fluid then passing through the body until it leaves that cartridge for filtration and dehydration.

Furthermore, the conveying of the fluid to the outlet of the dehydrating member and to the inlet into the internal space of the support body is not hindered, thereby avoiding pressure drops.

It is particularly important for the steps of dehydration and filtration of the fluid under pressure to be distinct and successive, which enables the cartridge according to the invention to be simple, convenient and economic both in terms of design and in terms of manufacture.

According to a preferred feature, which makes the manufacture of the filtration and dehydration cartridge according to the invention particularly simple, convenient and economic, said support is a one-piece plastics molding. In other words the body and the holding member are of plastics material molded as a single piece.

According to preferred simple, convenient and economic features of the filtration and dehydration cartridge according to the invention:

- said holding member projects from said end wall of said body by a main portion of a plastics material in which are conjointly formed said holding member and said body;

- the general cross-section of said holding member is in the shape of a cross formed by a main portion and two ribs projecting from respective opposite sides of said main portion, said main portion and said ribs extending in said internal space of said body from said end wall until they emerge from said internal space;

- said holding member projects from a central portion of said end wall of said body;

- said holding member has a hook at said free end for holding and suspending said dehydrating member;

- said hook has a cut-out configured to enable the passage of an anchoring lug of the dehydrating member as well as a non-return portion partially obturating said cut-out to prevent the withdrawal of said dehydrating member without the application of an external force;

- said body is of cylindrical general shape;

- said holding member extends centrally within said cylindrical body;

- said body has a first lateral wall at a first end, a second lateral wall at a second end which is an opposite end to said first end and a frame meeting said first lateral wall and said second lateral wall;

- said frame has a plurality of first rods meeting said first and second lateral walls and a plurality of second rods crossing said first rods to form a grid provided with a plurality of windows between said first and second rods;

- said body furthermore has at least one tooth configured as a projection from said second lateral wall and extending in said longitudinal direction and said holding member extends beyond said at least one tooth;

- at least one of said first and second lateral walls is provided with at least one device for fastening said cartridge in said pipe; and/or

- at least one of said first and second lateral walls is provided with at least one sealing device configured to enter into contact with an inside face of said pipe.

According to a second aspect the invention also relates to an air conditioning system for automotive vehicles comprising a closed circuit for circulation of a refrigerant fluid, which circuit is formed by a main pipe in which said fluid circulates and a cartridge disposed in said pipe and configured to be passed through by said fluid. The disclosure of the invention will now be continued with the description of an example embodiment, given below by way of illustrative and non-limiting example, with reference to the accompanying drawings, in which:

- Figure 1 is a diagrammatic and partial representation of an automotive vehicle air conditioning system comprising a cartridge for filtration and dehydration of refrigerant fluid passing through it, in accordance with the invention;

- Figures 2 and 3 are diagrams in perspective of a support for the filtration and dehydration cartridge, from different viewing angles enabling the top and the bottom of that support to be seen;

- Figure 4 is a plan view from below of the support illustrated in Figures 2 and 3;

- Figure 5 is the cross-section view on V-V of Figure 1 ; and

- Figure 6 is the perspective cross-section view on VI-VI of Figure 4. Figure 1 illustrates an air conditioning system 1 for an automotive vehicle (not shown) comprising a main pipe 2 in which passes a refrigerant fluid also termed refrigerant; a cartridge for filtration and dehydration of that refrigerant fluid; mechanical components 4 configured to act on the fluid and which are disposed upstream of the cartridge 3, in particular a compressor as well as a condenser; and other mechanical components 5 configured to act also on the fluid and which are disposed downstream of the cartridge 3, in particular an expansion device as well as an evaporator.

The air conditioning system 1 is formed from a closed circuit for conveying the refrigerant fluid, which circuit is represented in Figure 1 by the main pipe 2, by the line 22 diagrammatically representing a first extension of the main pipe 2 forming a fluid connection between the cartridge 3 and the mechanical components 5 downstream of that cartridge 3, the line 23 diagrammatically representing a second extension of the main pipe 2 forming a fluid connection between the mechanical components 4 upstream of the cartridge 3 and that cartridge 3 and the line 21 diagrammatically representing a secondary pipe of the closed circuit forming a fluid connection between the mechanical components 5 downstream of the cartridge 3 and the mechanical components 4 upstream of the cartridge 3.

Here, the fluid connections are thus represented very diagrammatically by the pipe 2 and the continuous lines 21 , 22 and 23 on each of which is represented an arrow indicating the direction of circulation of the refrigerant fluid coming from the mechanical components 4 and going to the cartridge 3 (line 23), passing through that cartridge 3 (pipe 2), exiting that cartridge 3 and passing towards the mechanical components 5 (line 22) and passing therefrom to return to the mechanical components 4 (line 21 ).

The air conditioning system 1 is thus configured in order for the refrigerant fluid to pass successively through the mechanical components 4 upstream of the cartridge 3, the cartridge 3, the mechanical components 5 downstream of that cartridge 3, then again the mechanical components 4 and so forth.

The main pipe 2 for conveying fluid is provided with an inlet tube 13 and an outlet tube 14.

The inlet tube 13 has an inlet connector 15 whose mechanical interengagement with the mechanical components 4 is represented very diagrammatically by the line 23.

The inlet connector 15 is provided with an inlet aperture 16 through which the fluid may flow.

As regards the outlet tube 14, this has an outlet connector 17 whose mechanical interengagement with the mechanical components 5 is represented very diagrammatically here by the line 22.

The outlet connector 17 is provided with an outlet aperture 18 through which the fluid that passed through the filtration and dehydration cartridge 3 can flow and pass to the mechanical components 5.

Here, the line 23 representing the second extension of the pipe 2 is connected at a first end to an outlet connector 26 of the condenser and at an second opposite end to the first end to the inlet connector 15 of the inlet tube

13; as regards the line 22 representing the first extension of the pipe 2, this is connected at a first end to the outlet connector 18 of the outlet tube 14 and at a second opposite end to the first end to an intake connector 19 of the expansion device; and as regards the line 21 representing the secondary pipe, this is connected by a first end to an outlet connector 20 of the evaporator and by a second opposite end to the first end to an intake connector 27 of the compressor.

Thus, between the outlet connector 26 of the condenser and the intake connector 19 of the expansion device, the refrigerant fluid passes through the cartridge 3 to be dehydrated then filtered therein.

With reference to Figures 1 to 6 a description will now be made in more detail of the filtration and dehydration cartridge 3.

This filtration and dehydration cartridge 3 has a support 7 of plastics material molded in one piece delimiting an internal space 8, a filter member 9 (represented only in Figure 4, see below) configured to be disposed within the support 7, that is to say in its internal space 8, as well as a dehydrating member 10 configured to be connected to that support 7, in a specific position in which that dehydrating member 10 is spaced from the filter member 9 such that the refrigerant fluid is first of all dehydrated then filtered by passing through the cartridge 3.

The support 7 has a body 28 as well as a central leg 29 having of cross-shaped section, which leg 29 is also termed holding member of the dehydrating member 10.

The body 28 is of substantially cylindrical shape extending in a longitudinal direction.

The body 28 has a end wall 31 , a first lateral wall 32 of cylindrical shape at a first end of the body 28, a second lateral wall 33 also of cylindrical shape at a second end of the body 28, which second end is an opposite end to the first end, as well as a frame 34 which is also of cylindrical shape and meets the first and second lateral walls 32 and 33.

The first lateral wall 32 connects by a first edge to the end wall 31 . That first lateral wall 32 has an outer surface in which are formed recesses 42, also termed fastening devices, which are of hemispherical shape as well as interrupted grooves 41. The recesses 42 are regularly spaced on the outer surface of the first lateral wall 32 and, between two successive recesses 42 a groove 41 is formed which is therefore interrupted (in other words not annular).

At a second edge of the first lateral wall 32 which is an opposite edge to its first edge, vertical rods 35, also termed first rods, extend in the longitudinal direction to a first edge of the second lateral wall 33.

A plurality of such vertical rods 35 extend between the first and second lateral walls 32 and 33 and are regularly spaced around the circumference of the body 28.

Each vertical rod 35 emerges from a first end situated at the second edge of the first lateral wall 32 with which it is conjointly formed of a plastics material and also emerges by a second opposite end to the first end situated at the first edge of the second lateral wall 33 with which it is conjointly formed of a plastics material.

These vertical rods 35 extend in the longitudinal direction (Figures 5 and 6) and form a portion of the frame 34.

These rods 35 have a internal surface (directed into the internal space 8) which is slightly frusto-conical forming a draft angle inside the internal space to facilitate the molding operations, and in particular mold stripping, of the support 7.

The frame 34 is furthermore formed by horizontal rods 36, also termed second rods, crossing the vertical rods 35. This frame 34 thus forms an annular framework joining the first and second walls 32 and 33.

Each horizontal rod 36 extends between two vertical rods 35 here situated at mid-length of those vertical rods 35; so as to form a plurality of windows 37 the outline of each of which is delimited by two portions of vertical rods 35, one portion of horizontal rod 36 and either one portion of the second edge of the first lateral wall 32 or one portion of the first edge of the second lateral wall 33.

The second lateral wall 33 has an annular shoulder 38 on its internal face which represents a reduction in the thickness of that second lateral wall 32 between its first edge and a second opposite edge. That second lateral wall 33 has, on a portion of greater thickness, two annular lips 43 projecting from its external surface.

These annular lips 43 are sealing lips which form an annular groove 44 between them and which are configured to enter into contact with an internal face 46 of the main pipe 2 (Figurel ).

Like the first lateral wall 32, the second lateral wall 33 furthermore has several hemispherical recesses 42 as well as interrupted grooves 41 each formed between two successive recesses 42.

The body 28 is furthermore provided with teeth 39 projecting from the second lateral wall 33 at the location of its second edge situated in the vicinity of the recesses 42 and the interrupted grooves 41 .

These teeth 39 extend in the general longitudinal direction of the body 28 and each has a first straight longitudinal portion which is joined to the second edge of the second lateral wall 33, which first straight portion is extended by an end portion extending transversely to the longitudinal direction, which end portion is extended by a ramp-shaped return portion then by a longitudinal return portion which is joined to the second edge of the second lateral wall 33.

The teeth 39 are configured such that the straight longitudinal portion of a tooth 39 faces the straight longitudinal portion of another tooth 39 and the return portions of a tooth 39 face the return portions of another tooth 39.

Between two successive teeth 39 are thus formed hollows 40 which have a different shape depending on the portions of the teeth 39 which face each other.

Certain hollows 40 have a U-shape with straight branches and other hollows 40 have a U-shape whose branches are partially flared like a V; and the hollows of different shapes are successive, that is to say that a hollow 40 of U- shape with straight branches is preceded and followed by a hollow 40 in the shape of a U with flared branches.

The teeth 39 are not all of the same length.

The central leg 29 has a main portion 47 which emerges on a central portion of the end wall 31 of the body 28 and which extends longitudinally and centrally in the internal space 8 of that body 28 as far as a free end 51 of that central leg 29 which emerges from that internal space 8, and even beyond the end portion of each of the teeth 39.

This main portion 47 is of substantially frusto-conical shape of which the narrowest cross-section is situated at its free end 51 and of which the widest cross-section is situated at base portions 45 where the end wall 31 and the main portion 47 are formed conjointly of plastics material.

On respective opposite sides of the main portion 47 a rib 48 projects conjointly formed with that main portion 47 and each having the same base 45 where each rib 48 is conjointly formed with the end wall 31 .

The two ribs 48 extend centrally the length of the internal space 8 of the body 28 and have a substantially frusto-conical shape in the manner of the main portion 47.

Each rib 48 has a beveled portion at the free end 51 .

The structure of the central leg 29 of cross-shaped section, and in particular that of its main portion 47 and of its ribs 48, makes that central leg 29 a particularly robust and rigid part.

The ribs 48 are shorter than the main portion 47 since, at its free end 51 , that main portion has a hook 49 provided with a cut-out partially obturated by a non-return portion 50 of that hook 49.

The hook 49 is formed outside the internal space 8 of the body 28 and beyond the teeth 39.

A description will now be made of how the filtration and dehydration cartridge 3 is assembled and of its arrangement in the main pipe 2.

The filter member 9 has the form of a screen (Figure 4) molded over the frame 34 in the internal space 8 of the body 28 of the support 7, and in particular over the rods 35 and 36 of the frame 34 which form a grid provided with windows 37 which enable the refrigerant fluid to pass through the screen forming the filter member 9.

This filter member 9 is thus fastened inside the body 28.

The dehydrating member 10 is formed by a sachet 25 forming an envelope 1 1 in which are introduced desiccant granules configured to absorb the moisture present in the refrigerant fluid, in other words the water. This dehydrating member 10 furthermore has an anchoring lug 24 sealed to the envelope 1 1 .

The anchoring lug 24 has the form of a ring which is configured in order for a portion thereof to be inserted into the cut-out formed in the hook 49 and acting slightly against the non-return portion 50 which is slightly deformable.

The dehydrating member 10 is thus suspended and held by its anchoring lug 24 to the hook 49 in a specific position relative to the filter member 9 and cannot be withdrawn without an external action to make the anchoring lug 24 come out from the hook 49 by its cut-out by acting against the non-return portion 50.

As the hook 49 is configured out of the internal space 8 of the space 7 and beyond the teeth 39, the dehydrating member 10 is easy to put into place, without being hindered by the body 28.

When the filter member 9 and the dehydrating member 10 are mounted on the support 7, the cartridge 3 is formed and the latter may be disposed in the main refrigerant fluid conveying pipe 2.

The body 28 is configured such that the sealing lips 43 come into contact with the internal face 46 of the pipe 2 so as to prevent the refrigerant fluid coming out from that pipe 2 by the outlet tube 14 without having passed through the screen of the filter member 9.

The teeth 39 are in reality shaped to be complementary to shapes formed in the pipe 2 so as to dispose the filtration and dehydration cartridge 3, and in particular the support 7, in a predetermined position.

Furthermore, when the support 7 is disposed in the predetermined position within the pipe 2, that support 7 is fastened to the pipe 2 in that predetermined position via those hemispherical recesses 42 which are configured to receive portions of the pipe 2 that have been deformed by punching.

The filtration and dehydration cartridge 3 is thus particularly stable within the pipe 2. A description will now be made with reference to Figure 1 of the fluid paths taken by the refrigerant fluid to dihydrate and filter.

The refrigerant fluid, at its exit from the condenser, transits via its outlet connector 26 in the second extension of the main pipe 2 represented by the line 23 until its enters into the inlet tube 13 via the inlet connector 15 and the inlet aperture 16, then passes through the envelope 1 1 of the dehydrating member 10 in order for the refrigerant fluid to enter into contact with the desiccant granules. That fluid leaves the envelope 1 1 dehydrated since the granules of desiccant retain the moisture, passes within the internal space 8 of the support 7, then crosses the screen of the filter member 9 and enters into the outlet tube 14 having been filtered in addition to having been dehydrated since the screen retains the impurities. The dehydrated and filtered refrigerant fluid exits the outlet tube 14 at the outlet connector 17 via the outlet aperture 18 and passes in the first extension of the main pipe 2 represented by the line 22 until it is taken into the expander device via its intake connector 19.

When the refrigerant fluid leaves the dehydrating member 10 and enters the internal space 8 of the body 28 at its second end, that fluid is not hindered since no obstacle obturates the section of passage defined at the location of that second end of the body 28; such that the fluid does not undergo any pressure loss.

When the fluid which has been dehydrated and filtered beforehand passes through the expansion device, the evaporator, the secondary pipe represented by the line 21 and once again the compressor and the condenser, that fluid may once again contain moisture and impurities; and that fluid again passes through the cartridge 3 to be dehydrated then filtered.

In particular in Figure 1 can be seen the path followed by the refrigerant in particular coming from the condenser, passing through the cartridge 3 and leaving that cartridge 3, as indicated by the arrows.

In variants that are not illustrated:

- the body does not have a shape that is substantially cylindrical but instead oval or rectangular; - the body design does not have any recess and interrupted groove but instead a single annular groove;

- the body does not have any recess provided for receiving portions deformed by punching of the pipe, but instead tapped apertures in which are fastened fastening screws inserted in advance sealingly through the pipe;

- the filter member is not molded onto the inside of the body, but instead is mounted on the outside of the body then fastened thereon for example by bonding or is molded onto the outside of the body once the support has been produced;

- the central leg does not have a cross-shaped section, but instead a hollow or solid circular section;

- the central leg does not have a hook at its free end and the dehydrating member does not have a ring in the form of an anchoring lug, but instead the central foot and the dehydrating member have other fastening devices configured to cooperate together or the central leg does not have a fastening device but has a form at its free end which is configured to provide a stable bearing for the dehydrating member ensuring precise positioning for the latter and preventing it from sliding towards the internal space of the body;

- the support does not have a cylindrical shape, but instead an oval or rectangular shape or else another suitable shape;

- the frame has more or fewer windows than in the example illustrated in the Figures;

- the body does not have any tooth at its second end; and/or

- the cartridge is not directly disposed in the conveying pipe, but rather in a specific casing connected at two points (via connectors) to the conveying pipe.

It should be noted more generally that the invention is not limited to the examples described and represented.