FR2782019A1 - Fluid filter box for rolled filter paper cartridge has central hub to hold the cartridge - Google Patents

Abstract

The fluid filter box for a filter element or cartridge made of rolled filter paper, has an inlet, an outlet and a removable cover closing the box. The box contains a hub (5) to receive, hold in shape and retain by its central hole and over all its height a filter element (7). The hub contains means of allowing the filtered fluid to flow to the outlet (4), suitable for the fluid pressure. The hub is designed to take all types of filter elements which are preferably homogeneous over their mass and which do not have complementary means of increasing their pressure loss or reducing their storage capacity for filtered particles. The hub receiving the central hole of the filter is fixed to the cover of the box, either permanently or so it can be removed. The hub is made of a cylindrical tube wall (5) with an external diameter defined as a function of internal pressure with a helical fin (9) on its periphery with a long pitch at a height where it is in contact with the internal wall of the filter element. The element is inserted or removed by a gentle rotation along the fin. The filtered liquid flows towards the outlet along collecting grooves (15) parallel to the rib over all its length. Each groove contains a number of holes through which the fluid flows into the hub. In addition to the helical grooves there are grooves parallel to the axis of the hub, also with outlet holes.

Description

I Filtration and microfiltration device for fluids and its

  Uses The present invention relates to filtration and microfiltration devices of the type using an interchangeable filter element disposed in a housing comprising a

  inlet of the fluid to be filtered and an outlet of the filtered fluid.

  Filtration and microfiltration devices are already known for filtering oil in devices forming an oil filter for internal combustion engines, in particular diesel engines, and in the housing of which an interchangeable filter cartridge can be inserted. Such a device is claimed in particular in patent FR 2 624 397. The box is designed so as to house and hold paper wound on a perforated cardboard sleeve 3, in which a removable cover 5 closes the box and is provided with a collar 6 penetrating into the cardboard sleeve. The openings of the sleeve 3 are formed by round holes 2 arranged in rows for the passage of the purified oil. This guy

  filter is arranged as a bypass of the low pressure oil stream.

  The disadvantage of this type of filter element comprising a sleeve or cardboard winding mandrel, lies mainly in the fact that it cannot be used for medium and high pressures. The purpose of this socket is to maintain the stability of the paper in the housing and its centering by means of the collar 6, 7; this core must itself be stable to keep the paper rolled up. This stability or rigidity is obtained for this specific application, by increasing the thickness of its wall which makes it possible to slow down its softening. The filtered oil passes only through the holes drilled in the mandrel. The surface of all of these holes is very limited relative to the internal surface of the mandrel. As a result, the increasingly fine particles retained in the filter element are stored on a set of cones, the point of which ends at each of the holes in the mandrel. This mandrel considerably increases the pressure drop in the filtering circuit and limits the storage capacity of the impurities to be filtered in relation to the total volume of the filter element and causes local clogging on each of the cones, this

  which also limits its duration of use.

  A first object of the device according to the invention is to overcome the drawbacks of this

type of low pressure filtration.

  A second object of the device according to the invention is to extend its application to the filtration and microfiltration of all types of fluids requiring microfiltration or

  medium and high pressure filtration with minimum pressure drop.

  The problem to be solved consists in finding a solution to the following points: e use of the maximum of the surface of the central hole of the filter element at all filtration or microfiltration pressures for the flow of the filtered liquid with the minimum loss of charge; * use of almost the entire volume of the filter element to accumulate the particles to be retained, avoiding local saturation occurring at the holes of the perforated cardboard sleeve (solution NTZ patent FR 2 624 397) not allowing use of the greatest possible part of the filtering volume available at all pressures e ensure the maintenance and stability of the filter element in its filtration housing for use cases at all filtration pressures by reducing the loss of charge; * ensure sealing, at the two parallel faces of the filter element, between the pressurized inlet of the liquid to be filtered and the outlet of the filtered liquid; * extend the application of filtration or microfiltration to all types of liquids or gases at low, medium and high pressure, at low, medium or high flow; * facilitate extraction and rapid replacement of the saturated filter element; * reduce the cost of the filter element at all pressures; * use filter elements capable of facilitating storage after use before its destruction

  for example by incineration, preferably by avoiding the emission of polluting residues.

  These problems are solved with the device according to the invention by using all types of filter elements which are preferably homogeneous throughout their mass and which do not include additional means which can increase their pressure drop or which are likely to reduce their capacity for particle accumulation. filtered. The holding of the filter element in the device is ensured, depending on the pressure, low, medium or high, by centering, holding and support hubs each corresponding to one of these pressures, leaving it free, at low presses almost the entire surface of its central hole for the flow of the filtered liquid; at medium pressure, the free flow area is a little more reduced than at low pressure and in the case of high filtering pressure the free flow surface is also a little more reduced than for medium pressure, because that the pressure drop increases with pressure because it is necessary to prevent the

  wall of the central hole of the filter element to sag completely on the hub.

  According to a preferable embodiment of the device according to the invention, it comprises a housing in which a hub is arranged to receive, maintain in shape and support by its central hole and over its entire height, a filter element; this hub comprises means for flow of the filtered fluid towards the outlet orifice of the housing, these flow means are adapted to the filtration pressure. The hub is adapted to receive all types of filter elements preferably homogeneous throughout their mass and not comprising additional means which may increase their pressure drop or of a nature to reduce their storage capacity for

particles to be filtered.

  the hub receiving the filter element is either integral with the cover of the device housing, or fixed in an easily removable manner on the housing cover, or positioned

  and held between the housing and the cover in corresponding centers thereof.

  For high pressures, the hub intended to receive, maintain and support by its central hole the filter element, consists of a cylindrical tubular wall, of an external diameter defined according to the internal pressure, acting on the filter element, its periphery comprises at least one very large pitch helical rib, of a height such that it is in pressure contact with the internal wall of the central hole of the filter element which is placed on the hub or extracted by a slight rotation on its rib, the high pressure presses the inner wall of the filter element on the wall of the hub; the flow of the filtered liquid towards the outlet is ensured by means of helical collecting grooves arranged parallel to its helical rib and over its entire length. The bottom of these grooves comprises a plurality of complementary flow holes opening into the interior of the hub, the end of which comprises means allowing the flow of the filtered fluid towards the outlet orifice. The helical grooves cooperate with complementary grooves parallel to the axis XX 'of the housing, each comprising

  also holes for the flow of the filtered fluid through the wall of the hub.

  For medium pressure, the hub intended to receive, maintain and support the filter element, consists of a cylindrical tubular wall, of an outside diameter depending on the internal pressure exerted on the filter element; its periphery comprises, over its entire length, very large pitch helical fins, of a height such that they leave a space between the deformed internal wall of the central hole of the filter element and the wall of the hub. The flow of the filtered fluid towards the outlet takes place partly in the spaces between the fins and through complementary flow holes passing through the

4,278,2019

  hub wall. The end of the hub includes means allowing the flow of the

  fluid filtered to the outlet.

  For low pressures, the hub intended to receive the filter element consists of a cylindrical tubular wall whose periphery comprises a plurality of fins arranged radially along its axis XX 'and having a helical shape, regularly distributed over its entire length. . The space between the wall of the central hole of the filter element and the tubular wall is provided to allow the entire flow of the filtered liquid.

  along the fins and the wall of the hub towards the outlet.

  According to a second embodiment, for low pressures, the hub intended to receive the filtration element consists of a plurality of high fins arranged radially and longitudinally, regularly distributed over its entire length relative to the axis XX ' on a full center. The filtered fluid flows between the fins

towards the exit.

  the housing receiving the filter element comprises, to ensure the seal between the inlet hole of the liquid to be filtered and the outlet hole of the filtered liquid with respect to the two flat surfaces of the filter element, sealing washers and a conical part on the housing and on the cover, oriented so as to compact the angle of the edges of the two flat faces of the filter element when the cover is closed, these two sealing washers are threaded on the fins of the hub, one against the cover and the other

  interposed on the bottom of the case, crossed by the hub.

  To facilitate its fixing, the body of the box has two symmetrical bosses of orientation engaged pivoting in complementary holes of a support. The housing is fixed in an orientable manner, in the position of use, by means of bolts engaged in other symmetrical bosses of the housing bearing on the interior walls of the support and pass through some of the oblong arcuate openings of said support, corresponding to

  the orientation chosen for the housing.

  For large flow rates of all types of fluids to be filtered, at low, medium or high pressure, the device is arranged to simultaneously receive several filter elements each stacked on a hub portion engaged on a central axis, each of these hub portions being engaged over the entire height of the central hole of the filter element, and whose cross-section and the means of flow of the filtered fluid are suitable for the filtering pressure. These hub portions are slid onto the central axis secured to or screwed onto the cover. This axis comprises at least three grooves for centering the hub portions, the filtered fluid passing through the flow holes of the hub portions and is evacuated between these grooves towards the outlet orifice. The lower part of the axle with a

  quickly removable immobilization means of the hub portions.

  According to a second embodiment of the device for large flow rates of all types of fluids to be filtered, at low, medium or high pressure, the section of the hub is suitable for the filtering pressure. Sealing between the filter elements is ensured by intermediate plates slid over the hub, the outer periphery of which has an oblique annular shoulder on each side, and by sealing washers (53) are centered on the hub, the assembly is held on the hub either by a rapidly removable immobilizing means, or simply the last filter element in support

  on a sealing washer and the hub being centered in a corresponding housing.

  For very high flow rates of all types of liquids or gases to be filtered, at low,

  medium or high pressure, the device is used in battery.

  The interchangeable filtration or microfiltration element is delivered in a waterproof bag made of flexible material, preferably biodegradable, combustible without polluting residues, said empty bag is used as a glove to hold the filter element during its extraction from the hub and to store it awaiting its destruction

preferably by combustion.

  The filtration and microfiltration device applies to all types of liquid or gaseous fluids requiring filtration or microfiltration at low, medium or high pressure, to retain and store particles with a residual particle size ranging

  up to a value of less than 1 micrometer.

  New and important advantages brought by the following device the invention: * use of interchangeable filter elements preferably homogeneous in their mass; * significant increase in the storage capacity of filtered particles at equal volume; * extension of the duration of use of the filter element, the filtered particles being distributed throughout the volume of the filter element; * ease of extraction of the used filter element by using a delivery bag in which it is temporarily stored before disposal by incineration; * possibility of crushing the worn filter element, due to its homogeneity, reduces its storage volume. A delivery bag is provided in combustible material without polluting waste; possibility of compressing the used filter elements to extract the

  residual liquid before incineration.

6 2782019

  The device according to the invention is described in detail in the text which follows with reference to the appended drawings in which: FIG. 1 shows, seen in section in elevation, an example illustrating the device intended for filtration at low pressure; * Figures 2, 3 and 4 show a section along AA 'of Figure 1, examples of finned hubs for different filtration pressures; * Figure S shows in sectional elevation and in partial section, an example of a hub comprising a helical fin cooperating with grooves and holes for discharging the filtered liquid; * Figure 6 shows in partial elevation, an example of a hub comprising a helical fin cooperating with two parallel grooves cooperating with vertical grooves and holes for discharging the filtered liquid through the hub; * Figures 7, 8 and 9 show an example of arrangement of the housing cooperating with a support for its fixing; * Figures 10 and 11 show, in section in elevation, an example of a device for

  high throughput filtering and a variant thereof.

  As shown in Figure 1 the device comprises a housing 1 and a cover 2 closing on the housing in a sealed manner using known means not shown, an orifice 3 for inlet of the liquid or gas to be filtered and an outlet 4 for the outlet of the filtered liquid or gas. The housing comprises a hub 5 arranged to receive, along an axis XX ', maintain in shape and support, through its central hole 6, a filter element 7. The central part of the cover 2 is integral with the cylindrical tubular hub 5 whose periphery 8 comprises, over its entire length, a helical fin 9 with a very large pitch. The role of this fin 9 is to maintain and support the wall of the central hole of the filter element which does not need mechanical strength by itself. The height 10 of the fin 9 is a function of the inlet pressure of the liquid or of the gas to be filtered, which can be low, medium or high. The filter element without mandrel 7 is placed on the hub 5 or extracted, either by rotation on the helical fin for high and medium pressures, or simply pushed in its place on the longer fins of the hub for low pressures . The cylindrical tubular wall of the hub 5 has an outside diameter defined as a function of the internal pressure exerted on the filter element. In the case of high pressure, the internal wall of the central hole 6 is pressed against the outside of the wall 5 of the hub and on the helical fin 9 of low height 10, as shown on the section of the hub of the Figure 2. The flow of the filtered liquid towards the outlet 4 is ensured by means of collecting grooves 15 parallel to the fin 9, and over its entire length, the bottom of which comprises a plurality of complementary flow holes 16 opening out to the inside the wall 5 of the hub, as shown in FIG. 5. To improve the flow and avoid local saturation, it is possible to add, as shown in FIG. 6, vertical grooves 17 connecting the helical groove or grooves 15 and can locally cut the fin 9. These grooves

  vertical can also have holes 16.

  To collect the filtered fluid, the end of the hub is engaged in a housing 18 allowing the flow of the filtered liquid to the outlet orifice 4, from the outside and

inside the hub.

  FIGS. 3 and 4 show examples of the section of the hub with fins higher than those of FIG. 2, for the medium and low pressures of the fluid to be filtered. For medium pressures, it is preferable to have many fins to better distribute the pressure and avoid excessive deformation of the wall 6 of the central hole of the filter element. This arrangement allows, with helical fins radially oriented and over the entire length of the hub along the axis XX ', to support the filter element well, leaving a space 20 between the inner wall 6 of the central hole of the filter element and the wall 21 of the hub. In this case again, the filter element is placed on the hub or extracted by a slight rotation on the fins. The flow of the filtered liquid towards the outlet 4 is ensured in the space delimited by the deformation of the wall of the central hole, by the sides of the fins and by the outside of the wall 5 of the hub, forming a collecting groove 22 opening out. in the housing 23 of the box collecting the filtered liquid discharging through the outlet orifice 4. In the case of medium pressure, it is possible, from place

  place, add drain holes 24 through the center of the hub.

  In the case of low pressure, as illustrated in FIG. 4, the fins 26 radially oriented on a solid axis 29 with respect to the axis XX 'and over the entire length of the hub, are fewer and higher defining, between each fin, a larger flow volume 27 which does not require flow holes from the inside of the hub. To avoid the untimely passage under pressure, of the liquids or gases to be filtered, the bottom of the housing and the internal wall of the cover have been arranged, with means for sealing between the orifice 3 of arrival of the liquid to be filter and the orifice 4 for evacuating the filtered liquid with respect to the two flat surfaces of the filter element. By way of example, such sealing means can be constituted by sealing washers 30, 31 and a conical part 34 on the housing and 35 on the cover, oriented so as to compact the lower and upper angle of the edges of the two flat faces of the filter element when the cover is closed. These two sealing washers are threaded onto the fins of the hub, one against the cover and the other interposed on the bottom of the housing, through which the hub passes. Figures 7, 8 and 9 show an example of arrangement of the housing 40 cooperating with a support 41 for its fixing. The housing 40 comprises two orientation bosses 42, 43 pivoting with play in corresponding holes of the support 41, in the shape of a U in folded sheet which is elastically deformable to allow the bosses 42, 43 to be engaged therein. the support is obtained by means of two lateral bosses 44, 45 of the housing each having a bearing face on the interior sides of the support 41. The fixing is provided by four bolts 46 which could be screws screwed into a thread of the bosses 44 , 45. To allow a preferably vertical orientation of the axis XX ′ of the housing in the case where the fixing wall of the support is not vertical, provision has been made for arcuate openings 47 for orientation of the fixing of the screws.

or bolts 46.

  FIG. 10 shows, in section in elevation, a first embodiment of the device for filtering large fluid flow rates. The housing 50 is arranged to receive several stacked filter elements (7). Two embodiments of the hub are provided. In a first mode shown in section in FIG. 10, the section of the hub is

  identical to those defined above for low, medium and high pressure.

  Sealing between the filter elements 7 is ensured by intermediate plates 49 slid onto the hub, the outer periphery 48 of which has a biased shoulder 51, 52 on each side and by sealing washers 53 centered on the hub and interposed between these various elements. The surface of the last filter element engaged on the single hub is sealed as in the case of FIG. 1, by pressing on a sealing washer 53 resting on the bottom of the housing, the hub being centered in the bottom

of the housing.

  In a second embodiment illustrated in section in FIG. 11, the intermediate plates 55 each have a hub portion 56, engaged over the entire height of the central hole of the filter element, and whose section is identical to that of the hubs previously defined for the different pressures. The hub portions 56 are slid on a central axis 57 integral with or screwed onto the cover 58. This axis 57 comprises for example three or four grooves 58 for centering the hub portions, the filtered fluid passing through the holes 16, 20 (not shown ) of the hub portions, is evacuated between the grooves 58 towards the outlet orifice 4. The lower part of the axle comprises a means

9 2782019

  quickly removable immobilization of the hub portions on the axis 57, for example a

elastic ring 59.

  The device according to the invention is applicable for the filtering of liquid and gaseous fluids of all types, in all industries having to filter fluids, for example the chemical and petrochemical industries, the mechanical industries using lubricating oils of engines with internal combustion, so-called movement oils for special machines and machine tools, for hydraulic motors, gear boxes and reducers, hydraulic cylinders, electroplating and the treatment of treatment rejects

  surfaces, etc .; pharmaceutical industry, various laboratories, agro-industry

  food, smoke filtering etc.

Claims (15)

CLAIMS:   1) Fluid filtration device in which a housing is arranged to receive a filter element or filter cartridge of the kind of those made of rolled filter paper; it includes an inlet for the liquid to be filtered, an outlet for the filtered liquid and a removable cover closing the housing; characterized in that the housing (1) comprises a hub (5) arranged to receive, maintain in shape and support by its central hole and over its entire height, a filter element (7), in that the hub (5) comprises means for the flow of the filtered fluid towards the orifice of   outlet (4), in that these flow means are adapted to the filtration pressure.   2) Fluid filtration device according to claim 1, characterized in that the hub (5) is adapted to receive all types of filter elements (7) preferably homogeneous throughout their mass and not comprising additional means which can increase their pressure drop or loss of storage capacity particles to be filtered.   3) Fluid filtration device according to claims 1 and 2, characterized in that the   hub (5) receiving the filter element (7) through its central hole, is integral with the cover (2) of the housing (1).   4) Fluid filtration device according to claims 1 and 2, characterized in that the   hub (5) receiving the filter element (7) through its central hole, is easily fixed   removable on the cover (2) of the housing (1).   ) Fluid filtration device according to claims 1 and 2, characterized in that the   hub (5) receiving the filter element (7) through its central hole, is removable, it is positioned and maintained, along the axis XX ', between the housing and the cover in corresponding centers of these.   6) Fluid filtration device according to one of claims 1 to 5, characterized in that   that the hub (5), intended to receive, maintain and support by its central hole the filter element (7), consists, for high pressures, of a cylindrical tubular wall (5), of a defined external diameter as a function of the internal pressure, acting on the filter element, in that its periphery (8) comprises at least one helical rib (9) with very large pitch, of a height (10) as it is in pressure contact with the internal wall of the central hole of the filter element (7) which is placed on the hub or extracted by a slight rotation on the rib (9), in that the high pressure, presses the wall inside (6) of the filter element on the wall of the hub, in that the flow of the filtered liquid towards the outlet (4) is ensured by means of collecting grooves (15) arranged parallel to the rib (9), on its entire length, in that the bottom of the grooves (15) has a plurality of complementary drainage holes shutter (16) opening into the interior of the hub (5), in that the end of the hub comprises means   allowing the flow of the filtered fluid towards the outlet orifice (4).   7) Fluid filtration device according to one of claims 1 to 6, characterized in that   that the helical grooves (15) cooperate with complementary grooves (18) parallel to the axis XX ', each also comprising holes (16) for the flow of filtered fluid.   8) Fluid filtration device according to one of claims 1 to 5, characterized in that   that the hub (5), intended to receive, maintain and support by its central hole the filter element (7), consists, for medium pressures, of a cylindrical tubular wall (5), of an external diameter function of the internal pressure exerted on the filter element, in that its periphery (8) comprises, over its entire length, helical fins (17) with very large pitch, of a height such that they allow a space (22) between the deformed internal wall (6) of the central hole of the filter element and the wall (8) of the hub, in that the filter element is placed on the hub or extracted by a slight rotation on the fins, in that the flow of the filtered fluid towards the outlet (4) takes place partly in the spaces (22) between fins and by complementary flow holes (24) passing through the wall (8), what the hub end has   means allowing the flow of the filtered fluid towards the outlet orifice (4).   9) Fluid filtration device according to one of claims 1 to 5, characterized in   that the hub (5), intended to receive the filter element (7) through its central hole, consists, for low pressures, of a cylindrical tubular wall (8), the periphery of which comprises a plurality of fins ( 26) regularly distributed over its entire length, arranged radially along its axis XX ′ and having a helical shape, in that the space (27) between the wall (6) of the central hole of the filter element and the tubular wall ( 8) is provided to allow the entire flow of the filtered liquid along   from the fins and from the wall of the hub towards the outlet orifice (4).   ) Fluid filtration device according to one of claims 1 to 5, characterized in that   that the hub (5), intended to receive the filter element (7) through its central hole, consists of a plurality of high fins (26) arranged radially and longitudinally, regularly distributed over its entire length parallel to the axis XX 'on a full center, in that the entire flow of the filtered fluid takes place   between the fins towards the outlet (4).   11) Fluid filtration device according to one of claims 1 to 10, characterized in   that the housing receiving the filter element comprises, to ensure sealing between the inlet hole of the liquid to be filtered and the outlet hole of the filtered liquid with respect to the two flat surfaces of the filter element, washers seal (30, 31) and a conical part (34) on the housing and (35) on the cover, oriented so as to compress the angle of the edges of the two flat faces of the filter element when the cover is closed , these two sealing washers are threaded onto the hub fins, one   against the cover and the other interposed on the bottom of the case, crossed by the hub.   12) Fluid filtration device according to one of claims 1 to 11, characterized in   that the housing body 40 has two symmetrical orientation bosses (42, 43) pivotally engaged in complementary holes of a support (41), in that the housing is fixed in an orientable manner, in the use position, to the means of bolts (46) engaged in symmetrical bosses (44, 45) of the housing bearing on the interior walls of the support (41) and passing through some of the oblong arcuate openings (47) of said support,   corresponding to the orientation chosen for the housing.   13) Fluid filtration device according to one of claims 1 to 12, characterized in that   that for large flow rates of all types of fluids to be filtered, at low, medium or high pressure, the device is arranged to receive several filter elements (7) each engaged on a hub portion (56) slid on a central axis (57 ), each of the hub portions (56), being engaged over the entire height of the central hole of the filter element, and of which the cross-section and the means of flow of the filtered fluid are suitable for the filtering pressure, in that the central axis (57) is integral with or screwed onto the cover (58), the axis (57) comprises at least three grooves (58) for centering the hub portions, in that the filtered fluid passes through the holes (16 , 20) of the hub portions and is evacuated between the grooves (58) towards the outlet orifice (4), the lower part of the axle comprising a means of rapidly removable immobilization of the portions of hub on the axle (57).   14) Fluid filtration device according to one of claims 1 to 15, characterized in that   that for large flow rates of all types of fluids to be filtered, at low, medium or high pressure, the section of the hub is suitable for the low, medium or high filtering pressure, the seal between the filter elements (7) is ensured by intermediate plates (49) slid over the hub, the outer periphery of which has an oblique annular shoulder on each side (51, 52), and by sealing washers (53) centered on the hub.   ) Fluid filtration device according to one of claims 1 to 14, characterized in that   only for very high flow rates of all types of liquids or gases to be filtered, at low,   medium or high pressure, the device is used in battery.   16) Fluid filtration device according to one of claims 1 to 15, characterized in that   that it applies to all types of liquids requiring filtration or microfiltration at low, medium or high pressure, to retain and store particles of   residual particle size up to a value of less than 1 micrometer.   17) Fluid filtration device according to one of claims 1 to 16, characterized in   that it applies to filtration or microfiltration at low, medium or high pressure of all types of gas, to retain and store particles of residual particle size   up to a value of less than 1 micrometer.   18) Fluid filtration device according to one of claims 1 to 17, characterized in   that the interchangeable filter element (7) is accompanied by a waterproof bag made of flexible material, preferably biodegradable and combustible without polluting residues, said bag is designed to be used as a glove to hold the filter element during its extraction from the hub and to store it while awaiting its destruction preferably by combustion.