Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/111—Making filtering elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/23—Supported filter elements arranged for outward flow filtration
  • B01D29/232—Supported filter elements arranged for outward flow filtration with corrugated, folded or wound sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/04—Supports for the filtering elements
  • B01D2201/0415—Details of supporting structures
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/10—Methods of surface bonding and/or assembly therefor
  • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
  • Y10T156/1025—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina to form undulated to corrugated sheet and securing to base with parts of shaped areas out of contact

Definitions

• the invention relates to a filter element with a filter cylinder lying on the outside of a fluid-permeable support tube, through which the fluid to be filtered can flow from the inside and is formed from a filter mat web, which has a sequence of folds that lie against one another at least in regions, and both Ends are connected to one another at a connection point to form an annular body.
• the invention also relates to a method for producing such a filter element.
• Filter elements of the aforementioned type are commercially available and are widely used, for example, in hydraulic systems in system branches through which hydraulic oils flow.
• the known filter elements are not completely satisfactory with regard to their operational safety and the stability of the beta value which is decisive for the filter performance.
• Particularly at high flow rates there is a risk that at the connection point at which the ends of the filter mat web are combined to form the ring body forming the filter cylinder, deformations or damage will occur due to the fluid differential pressure which is effective at the connection point.
• Such impairments and / or deformations the folds in the area of the connection point are designated here with the general expression “bulges of the folds”.
• the invention has for its object to provide a filter element which is distinguished from the prior art by improved operational reliability and better beta value stability, even at high flow rates.
• this object is achieved by an arrangement effective at the connection point for preventing buckling of the folds in the region of the connection point caused by the action of the flow of the fluid.
• the arrangement preventing the bulging in the area of the connection point is formed by combining the end folds of the filter mat web along those end wheels that face the inside of the ring body to be formed, so that the two adjoining the connection point Folds with their peaks on the ring body on the outside and facing the support tube.
• the connection point that is to say the weld seam or glue point, by means of which the ring body forming the filter cylinder is closed, is located on the inside of the filter cylinder the connection point is supported on both sides by the adjacent folds, which are located on the outside with their peaks on the ring body, on the support tube.
• the connection point does not form a weak point in relation to the forces that are effective due to the differential pressure that is present during operation.
• the filter mat web is preferably formed by a flexible mat structure made of metal-free, plastic-supported filter mats, the connection of the ends of the filter mat web, whereby a closed ring body is formed, being produced by a weld seam.
• the welding process must be carried out on the outside of the ring body, which means that the connection point is located on the outside of the filter cylinder, so that, as mentioned above, the weld seam in operation forms a weak point of the filter cylinder would.
• the invention provides according to a particularly advantageous embodiment that the flexible filter mat sheet is dimensioned such that the ring body can be turned over after the formation of an external weld seam, so that the weld seam on the turned, now ready-to-use ring body is internal.
• the ring body forming the filter cylinder is therefore, after being turned over, in a desirable manner protected against dents in the region of the weld seam now located on the inside.
• a holding device which has holding parts which overlap the folds of the ring body adjoining the connection point on both sides on their flanks facing away from the connection point. This results in a particularly secure support of the folds in the area of the connection point.
• the holding parts of the holding device can be formed by holding lugs which project radially inwards on the inside of the support tube.
• the holding parts can be formed by the legs of a bracket element U-shaped cross section, which can be plugged onto the folds adjacent to the connection point of the ring body.
• the invention also relates to a method provided for producing the filter element according to the invention, which has the features of claim 10.
• FIG. 1 shows a top view of an annular body provided as a filter cylinder for a filter element according to the invention in a partially manufactured state, with a weld seam formed from the outside being on the outside of the annular body;
• FIG. 2 shows a top view similar to FIG. 1 of the ring body forming the filter cylinder in the finished state, ie with the weld seam located inside after being turned over; 3 shows a perspective illustration of the ring body from FIG. 2;
• FIG. 4 shows a perspective illustration of the filter disk formed in the course of turning over the ring body from FIG. 1;
• FIG. 5 shows a greatly enlarged illustration of a fold section of the ring body with information on the dimensioning
• FIG. 6 shows a cross section of a second exemplary embodiment of the filter element according to the invention.
• FIG. 7 is a perspective view of the support tube of the embodiment of FIG. 6 without the filter cylinder located therein, and FIG. 8 is a perspective and exploded view of a third embodiment of the filter element.
• FIGS. 1 to 5 illustrate a first exemplary embodiment of the filter element according to the invention, of which the support tube designed in the usual way is not shown in these figures, which surrounds the filter cylinder in the finished state, which is designated as a whole by 1 and in the form shown in FIGS. 2 and 3 is received in the support tube, not shown.
• the annular body is flowed through by the fluid to be filtered from its interior designated 3 in FIG. 2, i. H. the clean side of the filter device according to the invention, not shown, is located on the outside of the support tube surrounding the ring body 1.
• the ring body 1 is formed from a folded filter mat web, which is combined at both ends to form a closed ring, the connection point being implemented by a weld seam 5.
• the filter mat web is formed by a flexible mat structure with reset properties, more precisely from metal-free, plastic supported filter mats, which can be welded to produce the ring body 1 with a longitudinal weld seam 5.
• a six-layer structure of the filter mat web is preferably provided, which has the following layers in succession: an outer support, a protective fleece, a pre-filter layer, a main filter layer, a support fleece and an inner support.
• a polyamide mesh or a polyester fabric can be used for the external support.
• a polyester material can be provided as the protective fleece.
• a glass fiber material preferably in a reduced form in terms of thickness and basis weight, or meltblown are suitable.
• the main filter layer can similarly be a glass fiber material, which is optionally impregnated, or meltblown.
• a polyester or polyamide material or a viscose fleece or a polyamide with meltblown can in turn be used as the support fleece.
• the inner support can be designed in a manner similar to the outer support as a grid or woven structure based on polyamide or polyester.
• FIGS. 1 to 4 shows, by turning the ring body 1 from the initial state shown in FIG. 1, in which the weld seam 5 is external, ie is formed by a longitudinal seam made from the outside, this weld seam 5 in the finished state shown in FIGS. 2 and 3 shifted inwards. While there is a gap 7 in the state of FIG. 1 with an external weld seam 5 on the outer edge of the ring body 1, the area 11 of the folds 9 of the folds 9 directly adjacent to the weld seam 5 on both sides with the surrounding support tube (not shown) does not touch , In the inverted state shown in FIGS. 2 and 3, the peaks 11 are the ones immediately adjacent to the Weld 5 adjacent folds 9 arranged on the outside, see Fig. 2, and thus supported against the support tube.
• FIG. 4 and 5 serve to illustrate the design and dimensioning of the filter mat web forming the ring body 1, i. H. a training that enables the ring body to be turned.
• the maximum length of the ring body which, if it is formed from a flexible fold structure, permits turning, depends on the number of folds, the fold height, the material thickness of the mat structure and the fold thickness of the ring body.
• Fig. 4 the outer and inner diameters of the disk body 13 are shown how it temporarily arises in the course of turning the ring body 1.
• Fig. 5 illustrates the dimensioning of the folds 9 both in terms of material thickness and fold size.
• the maximum length of the ring body can be derived as follows on the basis of the parameters drawn in FIGS. 4 and 5:
• FIG. 6 and 7 illustrate a second exemplary embodiment of the filter element according to the invention, the support tube 15 surrounding the filter cylinder also being shown, in contrast to the previous example, which is shown separately in FIG. H. without the filter cylinder inserted.
• the support tube 15, which is injection molded from plastic has longitudinal strips 17 on the outside, which adjoins the clean side in the case of a filter device in question, which are connected by webs 19 forming ring segments , between which there are windows 21 as fluid passages.
• FIG. 7 the support tube 15 surrounding the filter cylinder also being shown, in contrast to the previous example, which is shown separately in FIG. H. without the filter cylinder inserted.
• the support tube 15 which is injection molded from plastic, has longitudinal strips 17 on the outside, which adjoins the clean side in the case of a filter device in question, which are connected by webs 19 forming ring segments , between which there are windows 21 as fluid passages.
• the retaining lugs 23 and 25 are integrally formed on the inside of the support tube 5, with a retaining lug 23 extending continuously along a strip 17 of the support body. is formed, while on the other side divided retaining lugs 25 are provided, between which there are spaces 27 corresponding to the windows 21 forming the fluid passages.
• Fig. 8 shows a third embodiment with a support tube 15 without inner retaining lugs 23 and 25.
• a holding device is provided in this exemplary embodiment with a metallic clamp element 31 of U-shaped cross-section, which can be plugged onto the flanks of the folds adjacent to the weld seam 5 facing away from the weld seam 5 and in its holding action precede the holding lugs 23 and 25 of the corresponds essentially to the embodiment.
• the ring body 1 is turned over to the state shown in FIG. 2, so that the weld seam 5 is on the inside and the folds adjoining it are supported directly on the support tube 15 with their peaks 9.
• This embodiment is therefore secured in the area of the weld 5 against dents in two ways.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Filtering Materials (AREA)
• Filtration Of Liquid (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=30469339

Family Applications (1)

Country Status (6)

Cited By (4)

Families Citing this family (24)

Citations (3)

Family Cites Families (11)

• 2002
  • 2002-08-02 DE DE10235275A patent/DE10235275A1/de not_active Withdrawn
• 2003
  • 2003-07-26 WO PCT/EP2003/008271 patent/WO2004014516A1/de not_active Ceased
  • 2003-07-26 US US10/522,682 patent/US7462282B2/en not_active Expired - Lifetime
  • 2003-07-26 JP JP2004526792A patent/JP5059291B2/ja not_active Expired - Lifetime
  • 2003-07-26 EP EP03784083A patent/EP1525041B1/de not_active Expired - Lifetime
  • 2003-07-26 CN CNB038185903A patent/CN100337715C/zh not_active Expired - Lifetime
• 2008
  • 2008-05-30 US US12/155,173 patent/US20080257483A1/en not_active Abandoned

Patent Citations (3)

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