US3739916A - Filter element for filtering of liquids - Google Patents

Filter element for filtering of liquids Download PDF

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Publication number
US3739916A
US3739916A US00140059A US3739916DA US3739916A US 3739916 A US3739916 A US 3739916A US 00140059 A US00140059 A US 00140059A US 3739916D A US3739916D A US 3739916DA US 3739916 A US3739916 A US 3739916A
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US
United States
Prior art keywords
strip
filter element
corrugations
strip portions
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00140059A
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English (en)
Inventor
H Lammermann
H Schacht
F Cub
P Kleinert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3739916A publication Critical patent/US3739916A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/001—Making filtering elements not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/22—Cell-type filters
    • B01D25/24—Cell-type roll filters

Definitions

  • a plurality of at least substantially parallel transverse corrugations is provided in only one of these strip portions and the convolutions of the coiled strip define with one another two spirally intercalated internal filter chambers one of which is open at one axial end of the coil and the other of which is open at the other axial end of the coil.
  • the present invention relates generally to a filter element, and more particularly to a filter element for filtering of liquids.
  • the strip is first folded so as to provide two superimposed strip portions, and is only then provided in suitable manner as by embossing or the like with the transversely extending corrugations.
  • the strip itself usually consists of paper and when the corrugations are formed the structure of the paper is affected in both strip portions. This can be disadvantageous under certain circumstances.
  • the prior-art construction requires additional components for maintaining adjacent convolutions of the coiled strip element spaced from one another to permit the flow of liquid through the thus-obtained spaces. On one axial end adjacent convultions are also connected with one another by a suitable adhesive to provide two spirally intercalated filter chambers which are open from opposite axial ends of the coil.
  • a concomitant object of the invention is to provide such an improved filter element which offers itself readily for manufacture by automated production methods.
  • a filter element for filtering of liquids which, briefly stated, comprises a coiled strip of filter material including a pair of superimposed longitudinally coextensive strip portions each having a longitudinally extending free edge and a transversely spaced connected edge connected with the respectively other strip portion.
  • a plurality of at least substantially parallel transverse corrugations are provided in only one of these strip portions and the convolutions of the coiled strip define two spirally intercalated internal filter chambers one of which is open at one axial end of the coil and the other of which is open at the other axial end of the coil.
  • the corrugations compensate for length variations in one of the strip portions relative to the other strip portion which occur due to convoluting of the strip to coiled shape.
  • the corrugations are formed only the paper structure of the one strip it is understood that the strip will normally be again made of paper will be affected by the provision of the corrugations, whereas the paper structure of the other strip portion remains unchanged.
  • the corrugations still serve the purpose of providing a compensation for length variations which occur between the respective strip portions during convoluting of the strip to coil shape.
  • the corrugations in the one strip portion in conjunction with the fact that the other stripportion is not provided with such corrugations serve thus to act in effect as spacers maintaining adjacent convolutions spaced from one another and also maintaining the strip portions spaced from one another, without requiring separate components for this purpose as is known from the prior art.
  • the corrugations reinforce the material of the strip, making it possible to readily roll the strip composed of the superimposed strip portions to spiral configuration without requiring any auxiliary supporting components. Because of the regular and even distribution of the corrugations, the application of adhesive for the purposes and in the manner already discussed, and still to be discussed further below, can be properly carried out without the local accumulation of excessive quantities of such adhesive, whereby the overall use of the adhesive is reduced. Because it is not necessary to provide separate spacing components in the coil, more filter paper can be provided in form of the strip in a predetermined volume of a coil than this is possible in accordance with the prior art. This means, for instance, that is a predetermined filter surface area is specified, the volume of the coil can be reduced.
  • portion or strip portion which is provided with corrugations has a marginal section which is folded back upon the strip portion in question and extends along the free edge of the latter.
  • the free edge is reinforced and stiffened against bending, an advantage particularly with reference to adhesive connecting of adjacent convolutions of the strip in the coil made therefrom.
  • the strip is so convoluted to coil form that the strip portion provided with the corrugations faces inwardly towards the center of the coil whereas the non-corrugated strip portion faces outwardly away from the center.
  • the advantage here is that during the convoluting the strip portion provided with the corrugations (and which is therefore readily yeildable) is subjected to the pressure resulting from the winding or convoluting operation. This means that for obtaining a predetermined depth of the corrugations in the completed filter element, the depth of the corrugations formed in the strip prior to convoluting of the same, can be smaller that would otherwise be possible.
  • FIG. is a perspective view illustrating a filter element according to the present invention.
  • the coiled filter element is identified in toto with reference numeral 1. Because the outer free end of the coiled element has been shown loosened from the remainder of the element, it is clearly visible that the element is composed of an elongated strip 2 which conventionally consists of filter paper and which is folded in half in substantially V-shaped configuration to provide two strip portions 5 and which are longitudinally coextensive.
  • the strip portion 5 is provided with a plurality of longitudinally arrayed transversely extending corrugations 6 which extend over the entire width of the strip portion 5 and which are arranged at regular intervals normal to the foldong edge 7 at which the strip portions 5 and 10 are connected with one another.
  • the strip 1 is wound onto a center tubular element 4, which may for instance consist of cardboard or the like, and adjacent ones of its convolutions are tightly and firmly connected with a thermoplastic adhesive 3.
  • Each of the strip portions 5 and 10 has a free edge transversely spaced from the respective connected edge extending along the fold 7, and the free edge 8 of the strip portion 5 is provided with a marginal section 9 which is folded back upon a corresponding section of the strip portion 5 so as in this embodiment to be located between the strip portion 5 and the strip portion 10.
  • the latter is essentially smooth, and not provided with corrugations, whereas the marginal section 9 provided with the same corrugations as the remainder of the strip portion 5 and serves the purpose of reinforcing and stiffening the edge 8, making the corrugations 6 in this area resistant to deformation.
  • a strip of a thermoplastic adhesive 3 which may be of suitable and already well known type is arranged in the region of the free edge 8 between the corrugated strip portion 5 of any one convolution and the cooperating smooth strip portion 10 of the adjacent convolution of the spirally convoluted strip 2.
  • the purpose is to provide in the coil 1 two spirally intercalated filter pockets 11 and 12 one of which is open to and accessible from the axial end 13 whereas the other is open to and accessible from the axial end 14 of the coil.
  • the chambers 11 and 12 are completely separated from one another.
  • the chamber 11 Due to the provision of the section 9 between the strip portions 5 and 10, the chamber 11 has a larger volume than the chamber 12 to thereby provide adequate space for the deposition and retention of contaminants in a liquid which is to be filtered with the novel filter element, thus reducing the danger that the filter element might become clogged.
  • the filter element 1 will be inserted into a housing provided customarily for such filter elements, and sealed so that the axial end 13 is connected with a supply conduit and the axial end 14 with a withdrawal conduit. Intermediate these conduits the liquid to be filtered passes through the filter element 1 and is filtered.
  • a strip of suitable filter paper is first folded back upon itself along a section adjacent an edge, to thereby form the section 9.
  • the portion 5 provided with the section 9 is provided with corrugations extending transversely to the elongation of the strip and to the longitudinal center line thereof.
  • corrugations 6 which are advantageously provided by passing the strip through a pair of camming and bossing gears which of course act only upon that half of the strip corresponding later to the strip portions 5.
  • the strip is folded transversely to substantially V-shaped configuration in order to obtain the two strip portions 5 and 10. Now, it is spirally convoluted about the center tubular element 4, and the thermoplastic adhesive 3 is inserted between adjacent convolutions as the coil is being fonned.
  • thermoplastic adhesive 3 it is advantageous for the thermoplastic adhesive 3 to be supplied in viscous state through a nozzle onto the smooth strip portion 10 adjacent the free edge thereof, and to be pressed into the corrugations 6 during the convoluting so that it will solidify in these corrugations as it is allowed to cool off.
  • the use of such a material makes it possible to obtain a seal-tight and also a strong connection between the two strip portions 5 and 10 even when they are spaced relatively far fron one another. Also, this material does not shrink on cooling and is chemically resistant particularly to liquid fuels.
  • the beginning end which is secured to the center tubular element 4 and the terminal end which is shown loose in the drawing are each sealed by an additional quantity of thermoplastic adhesive 3 extending along lines parallel to the corrugations 6.
  • the sealing and the tearing of the first or innermost convolution with reference to the tubular element 4 is achieved in that an increased quantity of thermoplastic material is applied precisely over the edge of the first convolution during the winding process, so that as the second convolution is wound over the first convolution, the grooves between the layers are filled and a residual quantity of the adhesive is pressed out at the axial end of the coil but in still highly viscous state, where it is engaged by means of special tools and is pushed axially into the first two coils to be allowed to cool in order to obtain a bounding and sealing action.
  • sec tion 9 be located between the strip portions 5 and 10 assures during the winding of the strip 2 to the illustrated coil that the section 9 is compressed less in radial direction than the strip portion 5 with the corrugations 6 and will thus properly overlye the adjacent surface portions of the strp portions 5.
  • the drawing illustrates the corrugations 6 to be of uniform cross-sectional configuration throughout.
  • this embodiment is chosen, however, the function of the corrugations 6 as spaces, as reinforcements, and for length-compensating purposes remains unaffected.
  • a filter element for filtering of liquids comprising a strip of filter material folded so as to form two closely adjacent strip portions consisting of one piece and having aligned longitudinally extending free edges and longitudinally extending second edges transversely spaced from the respective free edges, said strip portions being, due to said folding, unitary along said second edges only and said strip being coiled so that each of said strip portions forms a plurality of convolutions which alternate with the convolutions of the other strip portion, only one of said strip portions having a plurality of at least substantially parallel transverse corrugations which compensate for length variations due to coiling of said strip, the convolutions of said strip portions defining two spirally intercalated internal filter chambers one of which is open in the region of said free edges and closed in the region of said second edges due to said strip portions being folded and therefore unitary along said second edges; and means for closing the other of said intercalated internal filter chambers along said free edges of said strip portions, so that said intercalated internal filter chambers are open and closed along opposite edge of said strip portions, respectively.
  • a filter element as defined in claim 1 said one strip portion facing inwardly toward the center of the coiled strip and the other of said strip portions facing outwardly away from said center.
  • thermoplastic means sealingly connecting said initial convolution with said center ele ment at the opposite axial ends thereof.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US00140059A 1970-08-08 1971-05-04 Filter element for filtering of liquids Expired - Lifetime US3739916A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2039482A DE2039482C3 (de) 1970-08-08 1970-08-08 Flüssigkeitsfilter

Publications (1)

Publication Number Publication Date
US3739916A true US3739916A (en) 1973-06-19

Family

ID=5779218

Family Applications (2)

Application Number Title Priority Date Filing Date
US373916D Pending USB373916I5 (it) 1970-08-08
US00140059A Expired - Lifetime US3739916A (en) 1970-08-08 1971-05-04 Filter element for filtering of liquids

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US373916D Pending USB373916I5 (it) 1970-08-08

Country Status (10)

Country Link
US (2) US3739916A (it)
JP (1) JPS5541804B1 (it)
BR (1) BR7100579D0 (it)
DE (1) DE2039482C3 (it)
ES (1) ES208789Y (it)
FR (1) FR2104075A6 (it)
GB (1) GB1351486A (it)
IT (1) IT988542B (it)
PL (1) PL82091B1 (it)
YU (1) YU35214B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039457A (en) * 1973-02-02 1977-08-02 Robert Bosch G.M.B.H. Coiled filter element for filtering of liquids
US4065341A (en) * 1972-11-21 1977-12-27 Robert Bosch Gmbh Method of making a liquid filter
US4310419A (en) * 1980-03-19 1982-01-12 Nippon Soken, Inc. Filter element for liquid straining filter
US5824232A (en) * 1996-04-15 1998-10-20 Filtration Technologies Corporation Corrugated filter sheet configured into a cylindrical filter media having near circular concentric channels
US6375700B1 (en) 2000-06-23 2002-04-23 Nelson Industries, Inc. Direct flow filter
US20020139745A1 (en) * 2001-03-29 2002-10-03 Kyosan Denki Co., Ltd. Fluid filtering member
US6482247B2 (en) 2000-06-23 2002-11-19 Nelson Industries, Inc. Multi-panel fluid filter with equalized contaminant passages
US6511599B2 (en) 2000-12-18 2003-01-28 Nelson Industries, Inc. Multi-element cylindrical filter with equalized flow
US20100300991A1 (en) * 2007-11-20 2010-12-02 Filtration Technology Corporation Filter with Exterior and Interior Media Components and Method of Filtering

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3513062A1 (de) * 1985-04-12 1986-10-23 REHAU AG + Co, 8673 Rehau Fluessigkeitsfilter
DE10045217A1 (de) * 2000-09-13 2002-03-28 Bosch Gmbh Robert Flüssigkeitsfilter
JP2006142200A (ja) * 2004-11-19 2006-06-08 Nippon Rokaki Kk エアフィルタ装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US668101A (en) * 1900-05-14 1901-02-12 James J Hinde Stair-pad.
US2599604A (en) * 1949-07-13 1952-06-10 Jordan V Bauer Filter element
GB699168A (en) * 1951-02-15 1953-10-28 Bosch Gmbh Robert Improvements in liquid filters
FR1094978A (fr) * 1953-11-28 1955-05-25 Cartouche filtrante pour liquides ou gaz et procédés pour sa constitution
GB755481A (en) * 1953-08-25 1956-08-22 Bosch Gmbh Robert Improvements in or relating to fluid filters
FR1222727A (fr) * 1959-01-21 1960-06-13 élément filtrant
US3025963A (en) * 1958-03-13 1962-03-20 Russell H Curtis Products useful as filtering devices and methods of making them

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US668101A (en) * 1900-05-14 1901-02-12 James J Hinde Stair-pad.
US2599604A (en) * 1949-07-13 1952-06-10 Jordan V Bauer Filter element
GB699168A (en) * 1951-02-15 1953-10-28 Bosch Gmbh Robert Improvements in liquid filters
GB755481A (en) * 1953-08-25 1956-08-22 Bosch Gmbh Robert Improvements in or relating to fluid filters
FR1094978A (fr) * 1953-11-28 1955-05-25 Cartouche filtrante pour liquides ou gaz et procédés pour sa constitution
US3025963A (en) * 1958-03-13 1962-03-20 Russell H Curtis Products useful as filtering devices and methods of making them
FR1222727A (fr) * 1959-01-21 1960-06-13 élément filtrant

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4065341A (en) * 1972-11-21 1977-12-27 Robert Bosch Gmbh Method of making a liquid filter
US4039457A (en) * 1973-02-02 1977-08-02 Robert Bosch G.M.B.H. Coiled filter element for filtering of liquids
US4310419A (en) * 1980-03-19 1982-01-12 Nippon Soken, Inc. Filter element for liquid straining filter
US5824232A (en) * 1996-04-15 1998-10-20 Filtration Technologies Corporation Corrugated filter sheet configured into a cylindrical filter media having near circular concentric channels
US6375700B1 (en) 2000-06-23 2002-04-23 Nelson Industries, Inc. Direct flow filter
US6482247B2 (en) 2000-06-23 2002-11-19 Nelson Industries, Inc. Multi-panel fluid filter with equalized contaminant passages
US6511599B2 (en) 2000-12-18 2003-01-28 Nelson Industries, Inc. Multi-element cylindrical filter with equalized flow
US20020139745A1 (en) * 2001-03-29 2002-10-03 Kyosan Denki Co., Ltd. Fluid filtering member
US20100300991A1 (en) * 2007-11-20 2010-12-02 Filtration Technology Corporation Filter with Exterior and Interior Media Components and Method of Filtering
US9409115B2 (en) 2007-11-20 2016-08-09 Filtration Technology Corporation Filter with exterior and interior media components and method of filtering

Also Published As

Publication number Publication date
DE2039482C3 (de) 1978-10-19
USB373916I5 (it)
JPS5541804B1 (it) 1980-10-27
DE2039482A1 (de) 1972-02-10
PL82091B1 (it) 1975-10-31
ES208789U (es) 1976-04-01
BR7100579D0 (pt) 1973-04-26
DE2039482B2 (de) 1977-08-11
IT988542B (it) 1975-04-30
ES208789Y (es) 1976-07-16
FR2104075A6 (it) 1972-04-14
YU190971A (en) 1980-04-30
GB1351486A (en) 1974-05-01
YU35214B (en) 1980-10-31

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