FR2788447A1 - ROUND FILTER CARTRIDGE HAVING A SUPPORT TUBE - Google Patents

Abstract

Filter cartridge in particular for liquids comprising end washers and a support tube. These cartridges are intended to filter liquids under high pressure differences. The weak points of such known cartridges are generally the bonded connection (22) receiving the filter paper (20) and the support tube (19). According to the invention, this connection is reinforced in that the cavity (28) formed by the side wall (29) is filled with glue which can pass through the passages (27) of the support tube and form a connection by form. In addition, spacers (32) between the filter paper and the bottom (21) of the end washer, allowing a more even distribution of the adhesive agent.

Description

STATE OF THE ART: The present invention relates to a cartridge for

  filter in particular for filtering liquids comprising a filtering agent of annular shape, in particular filter paper folded in a star with, at least one of the front faces of the filtering agent connected integrally to an end washer by a filling material, in particular a mass of adhesive, and comprising for the filtering agent, a tube

  of support whose edges plunge into the filling material

pleating,

  The invention also relates to a wire housing.

  be to receive such a filter cartridge.

  We know such filter cartridges used

  especially for filtering liquids. It is necessary

  to have a support tube, because the pressure difference ap-

  applied to the filter cartridge can reach very high levels. A filter cartridge fitted with a support tube is for example known from document US 5,302,284. When the cartridge is pressurized, the weak point of such a filter cartridge is the bonding of the filter paper to the washers end as well as the

  connection between the end washers and the central tube.

  This problem is solved according to the document recalled above in

  that the support tube is an integral part of the washers-

  the end ones. This connection is thus able to absorb the pressure differences applied to the cartridge and at the same time support the filter paper sufficiently to

  Also avoid failure of this part.

  However, the described embodiment of the cartridge

  filter requires the implementation of im-

  load bearing, because the geometry of the inner end washers

  grant the support or support tube is very difficult to achieve. Another possibility would be to connect the tube

  support and end washers after their manufacture

  tion. But this requires an additional manufacturing step.

  shut up for the cartridge, which also affects

  negatively on the manufacturing costs.

  Based on this state of the art, the present invention aims to develop a filter cartridge of inexpensive manufacturing and supporting the differences in

  pressures imposed between the side of the filtered material and this

  him unfiltered material. To this end, the invention relates to a filter cartridge defined above, characterized in that the support tube has passages in a zone in connection

with the filling material.

  The invention also relates to a filter receiving

such a cartridge.

  Advantages of the invention: The filter cartridge according to the invention has an annular filtering agent connected to at least one

  end washer with the help of a filling material

  wise. Thus the front face of the filtering agent penetrates into the filling material which can be glue or a

  foam. The same remark applies to a pre-

  seen in the direct vicinity of the outer or inner envelope surface of the filtering agent. The filtering agent can by

  example be a filter paper or a non-woven material

  or a combination of these materials. The end edges

  of the support tube enter the filling material.

  So that the connection made only by the filling material, in particular a bonded connection is also solid

  as possible, the support tube has passages at the level

  calf of the filling material into which the filling material flows at the time of manufacture of the filter cartridge. This achieves a bond by form in addition to the bonding bond by the filling material; after

  taken of the filling material, we arrive at a resistance

  higher tance of the filter cartridge vis-à-vis the

  possible pressure difference. The support tube can also

  LEMENT be made to be permeable to the fluid to be filtered.

  This can be achieved, for example, by a network-like structure. The introduction of the support tube into the filling material creates a connection between these parts which, due to the orifices mentioned above, is very solid. As

  the introduction of a filling material is just as necessary to seal between the filtering agent and the end washers, it is not necessary to pre-5 see additional manufacturing steps, which sim -

  simplifies the manufacture of the filter cartridge and thus saves money. Thanks to the passages or orifices, one arrives for the bonded bond to a very great resistance vis-à-vis

  pressure differences applied to the wire cartridge-

  be. This has the advantage that for suitable applications

  properties, you can choose a very fine filter,

  to be able to separate the pro-

  picks, for example when the filter cartridge is used

  placed in erosion machines. Another possibility

  resulting from the elevation thus made possible of the differences

  these pressure is the reduction of the filter area. This-

  it can be advantageous in applications for which

  space must be saved for the filter cartridge.

  The filter capacity can be obtained under these conditions by

  using thicker filter papers.

  According to a particular embodiment of the invention

  tion, the support tube is a perforated sheet closed in a ring. This must be done so that the holes in the sheet also arrive in the area wetted by the filling material. The holes at this point then perform the function of the passages described above, that is to say that they

  form a connection with the filling material

  pleating. This variant has the advantage of a fabrica-

  support tube. The passages necessary for the realization described with the filling material exist

already in the raw material.

  According to another embodiment, in addition to the holes existing in the perforated sheet, provision may be made

  other passages in the corresponding area of the support tube

  Harbor. This increases the strength of the connection between the filling material and the support tube. That

  is particularly important if the support tube does not

  has few openings due to the low flow rates at the filter lining. Thus the orifices at the level of the filling material are not sufficient to increase the solidity of the connection. In addition, this means also makes it possible to use perforated sheets having larger orifices. To make the connection between the support tube and the filling material, more passages may be provided.

  pups that are completely in the area of the ma-

  filling. Larger holes cannot

  perform this function if they are not completely imprinted

  sounded in the filling material.

  According to another variant of the invention, the rounds

  the end of the filter cartridge have, in section, a profiled side wall. The profile of the side wall

  is designed so that the adjacent support tube forms a

  quickly with the side wall. The filling material can

  then flow through the passages in the cavity to allow

  put the gluing of the support tube on both sides of its wall. This further strengthens the bond. In addition, such a profile of the side wall also produces a shape connection between the filling material and the end washer. This means all the more resistance to

filter cartridge pressure.

  To achieve greater solidity of the connection between the filter paper and the end washer, according to another embodiment of the invention, the bottom of

  the end washer is provided with spacers.

  These prevent the front face of the filtering agent from touching the bottom of the end washer. This allows the filling material to distribute itself better; moreover, the front face of the filtering agent can thus be better

  wet. This results in a greater solidity of the bond.

  sound between the filter medium and the end washer, which

  increases the possible pressures in this area accordingly.

  This is especially important because a failure of the cartridge

  filter plug always occurs at the coldest point

  gile. This measurement thus makes it possible to adapt the bonding of the filtering agent to the pressures acceptable by the tube of

  support. The spacers may be separate pieces.

  serées, annular in shape or part of the end washers such as a recess in the wall

  side of the end washer.

  It is advantageous to cut the spacers in the radial direction. We prevent these

  have an annular structure at the level of the round

  end delle. This annular structure would then constitute a barrier vis-à-vis the filling material which

  flows. If, however, they are cut in the direction

  diale, this allows the filling material to better

  distribute at the end washer.

  According to an advantageous development of the invention, the end washer of the filter cartridge is a piece of stamped sheet metal. The spacers can be made in the form of stains in the stamped part,

  for example obtained by deep drawing. The same remark

  that applies to the side wall that forms the cavity of the

  support tube. We can also do the same

  denies a side wall without cavity.

  One of the end washers of the filter cartridge can advantageously be closed, that is to say that it covers the interior volume in the filter cartridge. On this side of the filter cartridge, it is not

  necessary in these conditions to achieve tightness vis-

  opposite the housing, which also increases the

  possible pressure differences. The opposite side is ou-

  green, because the interior volume functions as the side of my-

  filtered or unfiltered material and must therefore be

  connected to a material inlet or a material outlet.

Drawings:

  The present invention will be described below in more detail with the aid of exemplary embodiments.

  shown schematically in the accompanying drawings, in which: Figure 1 is a schematic cross-section of a housing in which a filter cartridge is mounted, - Figure 2 shows the detail X of Figure 1, the variant of Figure 2 giving the form details at

the end washer.

  Description of the exemplary embodiments:

  Figure 1 schematically shows a filter. This filter consists of a pot-shaped housing 10 and a cover 11. After opening the cover 11, one can place

  the filter cartridge 12 in the housing 10 and after closing

  ture of the case, the cartridge is retained using the

  ports 13. The housing has an inlet 14 opening into the interior volume 15 of the filter cartridge. The side 16 of the filter corresponding to the side of the unfiltered material is

  separated from side 18 of the filter corresponding to the filament material

  trée by a seal 17. On the side of the filtered material 18, there is a support tube 19. This is placed with a filter paper 20 folded in a star and end washers 21 to be tightly connected to using a mass of glue 22. The housing further comprises an outlet 23 for evacuating

the filtered fluid.

  Figure 2 shows the radial section through one of the end washers 21; the paper filter 20 and the support tube 19 are then put in place. The support tube is formed of a perforated sheet provided

  orifices 24 making it permeable to fluid. The edge 25 feet

  in the adhesive mass 22. In the zone 26 adjacent to the edge 25 and which is defined by the wetting surface of the

  mass of glue 22, the support tube 19 comprises passages

  additional 27. The mass of glue which has not yet hardened can pass through these passages to reach the cavity 28 formed by the outer wall of the support tube and by a

  profiled side wall 29. On the inner side 15 of the car-

  filter button, the end washer has another side wall 29a which opens into a cover segment

  closing one side of the filter cartridge.

  The bottom 31 of the end washer 21 carries spacer members 32. These members are concentric with the volume formed by the side walls 29, 29a. The spacer members 32 are annular bosses in the form of beads provided on the bottom 31 of the end washer; in this exemplary embodiment, these bosses are distributed over an inner ring and an outer ring. The radial section shown of the end washer passes through a cutout 33 of the inner annular spacer. The cutouts 33 of the outer ring are offset, so that the outer ring of the spacer is cut by the radial cut as shown. In this manufacture of the filter cartridge, the filter paper 20 is placed with a front face 34 on the spacer 32. The mass of adhesive can flow and be distributed at the level of the washer.

  end crossing the passages 33.

Claims (5)

R E V E N D I C A T I ON S   1) Filter cartridge in particular for filtering liquids comprising a filtering agent of annular shape, in particular filter paper (20) folded in a star with, at least one of the front faces (34) of the filtering agent joined together   to an end washer (21) by a filling material   wise, in particular a mass of adhesive (22), and comprising for the filtering agent, a support tube (19) whose edges (25) plunge into the filling material, characterized in that the support tube (19) has passages (27) in a   zone (26) in connection with the filling material.   2) Filter cartridge according to claim 1, characterized in that   the support tube is made of a perforated sheet and the pas-   wise (27) in the area (26) of the support tube are made   by the corresponding part of the holes in the perfo-   dream. 3) Filter cartridge according to claim 2, characterized by other additional passages in the zone (26) of the tube of support.   4) Filter cartridge according to any one of the claims.   previous actions, characterized in that   a side wall (29) of the end washer (21) adjja-   centered on the support tube (19) present in radial section, a profile forming a cavity (28) between the support tube (19) and the side wall (29).    ) Filter cartridge according to any one of the preceding claims, characterized in that spacers (32) for the front face (34) of the filtering agent are provided at the bottom (29) of the end washer (21).   6) Filter cartridge according to any one of the preceding claims, characterized in that   the spacers (32) are traversed in the direction   radial tion by cutouts (33).   7) Filter cartridge according to any one of the claims.   tions above, characterized in that the end washer (21) is a stamped part, the side wall (29) which forms the cavity (28) and the spacers (32) being produced by shaping the stamped part.   ) Filter cartridge according to any one of the claims.   previous actions, characterized in that   one of the end washers (21) closes an internal volume   laughter (15) of the filter cartridge, formed by the threading agent   trant. 9) Filter comprising a housing (10) with an inlet (14),   an outlet (23) and a housing (13) for receiving a cartridge   filter head which separates the side of the material in a sealed manner   unfiltered third (16) and the side of the filtered material (18) in the filter, characterized by   a filter cartridge according to any one of the claims 1 to 8.