Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D27/00—Cartridge filters of the throw-away type
  • B01D27/08—Construction of the casing

Definitions

• the invention relates to a filter cartridge with a filter material containing cartridge container with bottom and peripheral wall and with a permanently closing the cartridge container lid, which has a lid base and a strip-shaped side wall formed thereon along its circumference, which is fastened to the inside of the cartridge container.
• Filter cartridges are components of filter devices, in particular water filters, and are used as replacement components in a pressure-resistant outer container.
• the outer contour of the filter cartridge corresponds essentially to the inner contour of the outer container, so that it absorbs the pressure acting on the cartridge walls through the fluid to be filtered.
• the bottom and peripheral wall of the filter cartridge therefore need not be designed to be pressure-stable.
• the situation is different with the cartridge cover, since there is usually a space between the cartridge cover and the cover of the outer container. This intermediate space may arise from the fact that the lid is inserted into the cartridge container and is fastened to the inside of the wall of the cartridge container, the peripheral side wall of the cartridge cover protruding upward from the bottom wall of the cartridge cover.
• This configuration of the cartridge cover requires not only a pressure-stable design of the cover, but also a pressure-stable attachment of the cover to the cartridge container in order to avoid leaks.
• the lid base forms approximately a right angle with the side wall formed on the circumference and extending upward, as is known, for example, from DE 199 58 649.7. Due to the internal pressure, upward forces act on the lid base, which is thereby curved and stretched accordingly. The result of this is that radially inwardly directed forces act on the side wall in the area of the connection point with the cover base, which lead to detachment of the side wall and to crack formation in the connection area.
• a housing for an air filter element is known from utility model DE 297 15 504 U1, which is intended to ensure sufficient stability under changing pressure conditions.
• the prior art refers to air filter housings in this prior publication, the upper part of which has an outward curvature. In contrast to this, it is proposed in this document to direct the curvature inwards so that the air pulsations resulting from pressure fluctuations are dampened by the relatively stiff edge region. How this cover part is attached to the housing or whether this cover part is an integral part of the housing is not disclosed.
• EP 0 861 682 B1 describes a cover for filter housings, which has less suction when removed from the filter housing and introduces less air into the interior of the filter housing when it is placed on the filter housing. It is a removable lid which has an overall slightly curved bottom without a curved edge section and a jacket-shaped side wall formed along its circumference, which extends in the direction of a longitudinal axis on both sides of the bottom and gives the lid the shape of a cup which is open at the bottom , At its lower area, an external thread is provided on the side wall, which interacts with the corresponding internal thread of the filter housing and thus forms fastening means with which the cover can be fixed in the housing.
• This lid is made of a relatively thick-walled material, the lid base being slightly curved outwards in order to give the lid sufficient stability when the filter housing is pressurized during operation. Since the side wall of the lid is only connected to the container wall via the external thread anyway, a certain elasticity of the side wall is ensured, which does not lead to leaks due to the additional sealing means on the upper section of the side wall.
• the object of the invention is to extend the life of filter cartridges with a permanently attached lid.
• a filter cartridge which is characterized in that the cover base in the direction of the peripheral wall merges into the side wall via an inwardly curved edge section, the curved edge section and the strip-shaped side wall uniting in the shaping region in a common wall section tapering inwards.
• the invention is based on the knowledge that the forces F D acting on the lid base due to the internal pressure bring about a tensile force F z in the region of the common wall section, which due to the curvature of the edge section has a large force component parallel to the side wall and possibly a small one internal force component perpendicular to the side wall.
• the curved edge section is that the forces exerted by the internal pressure on the cover can not only be weakened in the edge area, but can also be used to generate a sealing force. Because the side wall and the curved edge section of the lid base form a wall section common in the interior of the filter cartridge, the force component F acting on the common wall section due to the internal pressure is directed radially outward, so that the common wall section is pressed against the peripheral wall of the cartridge container. It is advantageous here if the common wall section forms the lower wall section of the side wall.
• the side wall preferably adjoins the curved edge section tangentially.
• the side wall is advantageously formed on the curved edge section.
• the tangential alignment further reduces the inward force component of the tensile force acting on the side wall and on the peripheral wall.
• a wedge-shaped annular space is formed on the outside of the cover in the edge area. It has been shown that it is sufficient if the curved wall section extends to the inner end of the strip-shaped side wall.
• the curved edge section preferably has an average radius of curvature R for which R ⁇ 3xS, in particular R ⁇ xS, where S denotes the wall thickness of the peripheral wall.
• the curved edge section preferably extends over an angle ⁇ of 80 ° to 100 °.
• ⁇ denotes the angle that the radius of curvature R traverses.
• the curved edge section has an essentially vertical section at one end in the region of the common wall section and merges into an essentially horizontal lid base section at the other end.
• the angular range ⁇ from 80 ° to 100 ° takes into account the angle of inclination of the peripheral wall with respect to the bottom wall of the cartridge container. For example, if the cartridge container is conical extended upwards, which is the preferred embodiment, the angle ⁇ is preferably in the range from 90 ° to 100 °.
• the side wall advantageously has an upper wall section which extends upwards from the common wall section at least up to the height of the lid base.
• the contact surface of the strip-shaped side wall is thereby increased on the one hand and on the other hand a contact surface is created for a support ring, which can be arranged on the cover.
• this upper wall section serves to grip and hold the lid by means of a gripping tool when it is inserted into the cartridge and fastened to the cartridge wall.
• the cartridge cover can thus be made thinner because the pressure exerted on the inside of the cartridge cover is essentially passed on to the cover of the outer container via the support ring. Since the support ring is reusable, but the cover must be disposed of with the filter cartridge, costs can be saved with the cover material.
• the bottom contour of the support ring is preferably essentially complementary to the outer contour of the cover, so that the cover can rest against the support ring over its entire area when subjected to pressure.
• the support ring does not completely fill the wedge-shaped annular space.
• a gap-shaped intermediate space is advantageously present between the support ring and at least the section of the curved edge section adjoining the common wall section. This gap-shaped space can extend up to the horizontal end of the curved edge section extend.
• the term essentially complementary is therefore to be understood in consideration of this gap-like space.
• connection of the cover to the peripheral wall of the cartridge container can be produced, for example, by gluing or welding.
• laser welding is preferably used because the desired section of the side wall can be welded to the peripheral wall with greater accuracy.
• at least a portion of the common wall portion is laser welded to the peripheral wall of the cartridge container. It has been shown that the entire width of the side wall does not have to be welded to the peripheral wall of the cartridge container in order to achieve sufficient stability. It is advantageous if the welded area extends to the lower end of the common wall section.
• the material of the cartridge container is transparent to laser light and the material of the side wall of the lid designed to absorb laser light. It is sufficient if only the material of the side wall of the cartridge cover is absorbent for laser light.
• FIG. 1 shows a section through a filter cartridge in a perspective view
• Fig. 3 shows a section through the upper region of the
• FIG. 4 shows an enlarged representation of the detail Y in FIG. 3.
• FIG. 1 shows a filter cartridge 1 with a cartridge container 6 with bottom wall 2, peripheral wall 3 and opening edge 4 in vertical section.
• the filter material inside the filter cartridge has not been shown.
• the peripheral wall 3 is conical in this embodiment. A cylindrical peripheral wall is also possible.
• the cartridge cover 10 is inserted at a distance from the opening edge 4.
• the cartridge cover 10 has a cover base 11 which has a central part 12 which is essentially horizontal except for the central region and a curved edge section 14, which is explained in more detail below in connection with FIGS. 2a, b.
• the detail X is shown enlarged in FIG. 2a. It can be seen that the horizontal central part 12 merges in the direction of the peripheral wall 3 into a curved edge section 14, which extends into the interior of the filter cartridge and unites with its vertical section 15 ′ in the common wall section 15 with the side wall 16.
• the side wall 16 has an upper side wall section 17 and a lower side wall section 18, the lower side wall section 18 being identical to the common wall section 15. This common wall section 15 tapers downwards.
• the curved wall section 14 is so strongly curved that it runs out in the vertical direction, i. H. the side wall 16 is formed tangentially on the curved edge section 14. The side wall 16 extends almost parallel to the peripheral wall 3.
• the curved edge section 14 is characterized by the radius of curvature R, which in the example shown here is approximately 7 ⁇ S, where S denotes the wall thickness of the peripheral wall 3.
• the angle ⁇ designates the area that the radius of curvature R sweeps, where R can also be a mean radius of curvature.
• the curved edge section 14 extends over an angle ⁇ of approximately 90 °.
• the peripheral wall 3 can be conical and forms an obtuse angle with the bottom wall (not shown).
• the upper wall section 17 extends up over the horizontal middle part 12, being between the upper
• the wedge-shaped annular space 5 has an acute angle, preferably from 40 ° to 50 °.
• the common wall section 15 is welded to the peripheral wall 3 in the area 19, in particular laser-welded.
• the diameter of the cover is preferably made with an oversize so that the wall section 15 is additionally pressed against the peripheral wall 3 during welding. This pre-pressing is particularly advantageous for laser welding in order to be able to produce a homogeneous weld seam.
• This area 19 extends upwards from the lower tip of the common wall section 15, it being sufficient that this welding area 19 does not extend over the entire width of the lower side wall section 18.
• the force generated by the internal pressure is exemplified by the arrow F. It can be seen that the internal pressure presses on the common wall section 15 and thus exerts an additional sealing force in particular in the welding section 19.
• FIG. 2b corresponds to FIG. 2a, with the cover which is curved by the forces F D acting on the inside being additionally shown in dashed lines.
• the central part 12 and the curved edge section 14 are pressed upwards and assume the position 12 ', 14', which creates tensile forces Fz, which have their main component F Zr ⁇ parallel to the side wall 16 in the common wall section 15.
• Fz tensile forces
• Fz which have their main component F Zr ⁇ parallel to the side wall 16 in the common wall section 15.
• the cover 10 is drawn in completely and has connecting tubes 13 in the center. Accordingly, the support ring 20 likewise has an annular opening 27 in its center, so that these connecting tubes 13 are freely accessible from above.
• the support ring 20 has radial support ribs 21 which are connected to one another in the lower region by a common support ring base 22 and in the outer peripheral region by a common support ring wall 26.
• the contour of the support ring base 22 is almost complementary to the outer contour of the cover 10, the support ring 20 also abutting the side wall 16 with its side wall 26.
• a gap-shaped annular space 30 is formed in the area of the wedge-shaped annular space above the curved edge portion 14, in particular above the portion 14 "of the curved edge portion 14 of the cover 10. This is achieved in that the pointed edge 25 of the tapering curved bottom portion 24 of the support ring base 22 is aligned does not extend completely into the annular space 5 and the curved section 24 of the support ring base 22 has a smaller radius of curvature than the curved edge section 14. This different radius of curvature means that in the horizontal section 23 of the support ring base 22 the latter rests against the horizontal central part 12 of the cover base.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Closures For Containers (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Retarders (AREA)
• Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
• Liquid Crystal Substances (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Apparatus For Making Beverages (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=30009872

Family Applications (1)

Country Status (12)

Cited By (2)

Families Citing this family (8)

Citations (5)

Family Cites Families (19)

• 2002
  • 2002-07-10 DE DE10231095A patent/DE10231095B4/de not_active Expired - Fee Related
• 2003
  • 2003-07-09 WO PCT/EP2003/007402 patent/WO2004007047A1/de not_active Ceased
  • 2003-07-09 AU AU2003281151A patent/AU2003281151B2/en not_active Expired
  • 2003-07-09 JP JP2004520548A patent/JP4680592B2/ja not_active Expired - Fee Related
  • 2003-07-09 RU RU2005100850/15A patent/RU2316381C2/ru active
  • 2003-07-09 US US10/520,733 patent/US8376147B2/en not_active Expired - Fee Related
  • 2003-07-09 AT AT03740445T patent/ATE337843T1/de active
  • 2003-07-09 PT PT03740445T patent/PT1519777E/pt unknown
  • 2003-07-09 DE DE50304871T patent/DE50304871D1/de not_active Expired - Lifetime
  • 2003-07-09 ES ES03740445T patent/ES2268382T3/es not_active Expired - Lifetime
  • 2003-07-09 DK DK03740445T patent/DK1519777T3/da active
  • 2003-07-09 EP EP03740445A patent/EP1519777B1/de not_active Expired - Lifetime
  • 2003-07-09 CA CA2502929A patent/CA2502929C/en not_active Expired - Lifetime

Patent Citations (5)

Non-Patent Citations (1)

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