US3759391A - Coiled filter element and method of manufacturing the same - Google Patents

Coiled filter element and method of manufacturing the same Download PDF

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Publication number
US3759391A
US3759391A US00293997A US3759391DA US3759391A US 3759391 A US3759391 A US 3759391A US 00293997 A US00293997 A US 00293997A US 3759391D A US3759391D A US 3759391DA US 3759391 A US3759391 A US 3759391A
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US
United States
Prior art keywords
strip
margins
filter element
strip portions
coil
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
US00293997A
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English (en)
Inventor
A Dreher
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
Priority claimed from DE19691948704 external-priority patent/DE1948704C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3759391A publication Critical patent/US3759391A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B01D25/22—Cell-type filters
    • B01D25/24—Cell-type roll filters

Definitions

  • the present invention relates to a coiled filter element, particularly for liquids, and a method of manufacturing the same.
  • Conventional coiled filter elements in the art are made of an elongated strip of filter material and consist of two superimposed strip portions which, lengthwise, are connected at their one side and open at their opposite side and which, in wound condition, are collectively interconnected at their open sides and spaced at their connected sides so as to respectively define first and second parallel adjoining filter pockets in the coil with the filter-pockets open at the opposite end faces of the coil.
  • One such known coiled filter element comprises consecutively wound strip portions of a paper filter material and which, in conjunction with a spacer strip arranged at the opposite longitudinal sides of the strip portions, define a substantially V-shaped cross section.
  • a further object of the present invention is to provide a method of manufacturing such a coiled filter element according to the invention.
  • the coiled filter element comprises a spirally wound elongated strip of filter material consisting of two superimposed strip portions extending lengthwise of the strip and each having two longitudinally extendingmargins located at opposite lateral sides of the strip.
  • Each of the strip portions is provided with a plurality of at least substantially parallel corrugations extending transversely to the elongation of the strip.
  • First spacing means are interposed between the strip portions and extend along and space apart the margins thereof at one lateral side of the strip, and second spacing means are disposed on and extend along the margins of the strip portions at the other lateral side of the strip for spacing apart the consecutive convolutions of the coiled filter element.
  • the corrugations of the other strip portion flatten as they permit the other strip portions to be sufficiently longitudinally stretched to compensate for the length differential which would otherwise develop between it and the inner strip portion.
  • coiled filter constructions which, in order to overcome the above disadvantages, employ two spirally wound paper strips whose longitudinal margins extending at the axially opposite end faces of the filter element, are alternately connected in permeable and impermeable relationship.
  • coiled filter element which, in or er to provide a length compensation ofone stripportion relative to the other, utilizes two filter material strip portions of unequal length. This avoids the abovediscussed problem, but such a construction cannot be economically manufactured.
  • SUMMARY OF THE INVENTION Object of the present invention is to overcome the above disadvantages and to provide a simple but effectively and economically constructed coiled filter element which is designed in such a way as to afford a simgated spacer strip 4 extends along the margin 1 l at that
  • the novel features which are considered as characteristic for the invention are set forth in particular in the appended claims.
  • the inventionitself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be bestunderstood from the following-description of specific embodiments when read in com nection with the accompanying drawing. 1
  • the filter elementcoil 1 particularly for use with liquids, essentially comprises a crepe paper strip 2 which is folded upon itself in substantially V-shaped configuration to provide the strip portions 2a and 2b which are superimposed 'and longitudinally coextensive.
  • Two spacing strips 3, 4 and adhesive filaments 5, 6, are spirally wound to the shape of the coil 1 together with the strip 2 onto core tube 7.
  • the two strip portions 2a, 2b are provided with a plurality of transverse corrugations 8 which are adjacent one another longitudinally of the strip 2.
  • the folded crepe paper strip 2 can most easily be formed with such corrugations by advancing it through a pair of loosely intermeshing spur gears, not shown, tothereby form the closely arranged, parallel corrugations 8 in the strip sections 2a and 2b. Aside" from their lengthcompensating function, the corrugations also reinforce the paper and consequently improve the pressure resistance of the filter element coil 1.
  • first corrugated spacer strip 3 Provided between the margins 9 and 10 at the open side of the substantially V-shaped paper strip 2, is a first corrugated spacer strip 3, to maintain these margins slightly spaced apart from one another.
  • the coil 1 is provided, when the strip 2 is convoluted, with two spirally intercalated filter pockets 12 and 13 of which pocket 12 is open for entry of fluid at the axial end 14 of the coil while the pocket 13 is open for the same purpose at the other axial end 15 of the coil 1.
  • the material of the strip 2 is relatively readily stretchable, either inherently or because of its creping, it may be advantageous not to provide the margins 9 and where the filaments 5 and 6 are located with the grooves or corrugations 8. Instead, these margins 9 and 10 could be flat or almost flat, thus reducing the quantity of adhesive filament required to obtain the desired effects.
  • the present invention compared to what is known from the art, requires adhesive seams which are approximately only half as long as known from the art. This is not only reflected in a saving of material, but also permits much more rapid and economic manufacture of the novel filter element and at the same time increases the reliability of operation of the element, the latter factor being aided by the fact that the novel element has a larger active surface area available for filtration purposes.
  • a coiled filter element comprising a coil of an elongated strip of filter material transversely folded upon itself so as to produce superimposed longitudinally coextensive strip portions each having two longitudinally extending margins respectively located at one and at another lateral side of said strip, said strip portions being of one piece with one, another along-said margins of said other lateral side of said strip; a plurality of at least substantially parallel corrugations provided in each of said strip portions and extending traiisversely to the elongation of said strip, the convolutions of said strip defining two spirally convoluted internal filter pockets 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, and said corrugations enabling compensation of length variations which occur due to convoluting of said strip in one of said strip portions with reference to the other strip portion with which said one strip portion is of one piece along said margins at said other lateral side; and sealing means sealingly connected consecutive convolutions of said coil in the region of one of said axial
  • Method of manufacturing a coiled filter element comprising the steps of forming an elongated strip of filter material transversely folded upon itself so as to produce superimposed longitudinally coextensive strip portions extending lengthwise of said strip and each having two longitudinally extending margins located at opposite lateral sides ofsaidstrip, with the margins at one lateral side of said strip portions being of one piecewith each other; forming a plurality of at least substantially parallel transverse corrugations in each of said strip portions of said elongated strip; providing adhesive means on said strip portions along said margins at the other lateral side of said strip; and convoluting said strip to form a coiled element having a plurality of convolutions forming a pair of spirally convoluted filter pockets one of which is open at one axial end of said coiled element and the other of which is open at the other axial end of said coiled filter element.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)
US00293997A 1969-09-26 1972-10-02 Coiled filter element and method of manufacturing the same Expired - Lifetime US3759391A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691948704 DE1948704C3 (de) 1969-09-26 Flüssigkeitsfilter und Verfahren zu dessen Herstellung

Publications (1)

Publication Number Publication Date
US3759391A true US3759391A (en) 1973-09-18

Family

ID=5746587

Family Applications (1)

Application Number Title Priority Date Filing Date
US00293997A Expired - Lifetime US3759391A (en) 1969-09-26 1972-10-02 Coiled filter element and method of manufacturing the same

Country Status (5)

Country Link
US (1) US3759391A (enrdf_load_stackoverflow)
ES (1) ES189981Y (enrdf_load_stackoverflow)
FR (1) FR2060461A5 (enrdf_load_stackoverflow)
GB (1) GB1253117A (enrdf_load_stackoverflow)
YU (1) YU34843B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975273A (en) * 1974-08-29 1976-08-17 Parma Industries, Inc. Two-stage fluid filter
US4039457A (en) * 1973-02-02 1977-08-02 Robert Bosch G.M.B.H. Coiled filter element for filtering of liquids
WO1983001582A1 (en) * 1981-11-02 1983-05-11 Donaldson Co Inc Fluid filtering device
JPS62183504U (enrdf_load_stackoverflow) * 1986-05-08 1987-11-21
JPS6316809U (enrdf_load_stackoverflow) * 1986-07-15 1988-02-04
US4765906A (en) * 1985-03-12 1988-08-23 Epoc Limited Cross-flow filtration
US4946310A (en) * 1987-06-09 1990-08-07 Akzo N.V. Dome for waste dumps
US5754365A (en) * 1993-03-02 1998-05-19 International Business Machines Corporation Structure and enclosure assembly for a disk drive
US5820646A (en) * 1996-04-26 1998-10-13 Donaldson Company, Inc. Inline filter apparatus
US5895574A (en) * 1996-04-26 1999-04-20 Donaldson Company, Inc. Rolled liquid filter using fluted media
US5902364A (en) * 1996-04-26 1999-05-11 Donaldson Company, Inc. Conical filter
US5911883A (en) * 1996-10-04 1999-06-15 Minnesota Mining And Manufacturing Company Flow-by solid phase extraction method
CN102176953B (zh) * 2008-09-18 2015-05-06 斯科特科技股份有限公司 层叠过滤器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564637A (en) * 1950-02-23 1951-08-14 Fram Corp Filter cartridge
GB755481A (en) * 1953-08-25 1956-08-22 Bosch Gmbh Robert Improvements in or relating to fluid filters
US3279616A (en) * 1963-10-28 1966-10-18 Bourdale Lucien Rene Justin Cartridge filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564637A (en) * 1950-02-23 1951-08-14 Fram Corp Filter cartridge
GB755481A (en) * 1953-08-25 1956-08-22 Bosch Gmbh Robert Improvements in or relating to fluid filters
US3279616A (en) * 1963-10-28 1966-10-18 Bourdale Lucien Rene Justin Cartridge filter

Cited By (15)

* 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
US3975273A (en) * 1974-08-29 1976-08-17 Parma Industries, Inc. Two-stage fluid filter
WO1983001582A1 (en) * 1981-11-02 1983-05-11 Donaldson Co Inc Fluid filtering device
US4410427A (en) * 1981-11-02 1983-10-18 Donaldson Company, Inc. Fluid filtering device
US4589983A (en) * 1981-11-02 1986-05-20 Donaldson Company, Inc. Fluid filtering device
US4765906A (en) * 1985-03-12 1988-08-23 Epoc Limited Cross-flow filtration
JPS62183504U (enrdf_load_stackoverflow) * 1986-05-08 1987-11-21
JPS6316809U (enrdf_load_stackoverflow) * 1986-07-15 1988-02-04
US4946310A (en) * 1987-06-09 1990-08-07 Akzo N.V. Dome for waste dumps
US5754365A (en) * 1993-03-02 1998-05-19 International Business Machines Corporation Structure and enclosure assembly for a disk drive
US5820646A (en) * 1996-04-26 1998-10-13 Donaldson Company, Inc. Inline filter apparatus
US5895574A (en) * 1996-04-26 1999-04-20 Donaldson Company, Inc. Rolled liquid filter using fluted media
US5902364A (en) * 1996-04-26 1999-05-11 Donaldson Company, Inc. Conical filter
US5911883A (en) * 1996-10-04 1999-06-15 Minnesota Mining And Manufacturing Company Flow-by solid phase extraction method
CN102176953B (zh) * 2008-09-18 2015-05-06 斯科特科技股份有限公司 层叠过滤器

Also Published As

Publication number Publication date
YU205670A (en) 1979-10-31
FR2060461A5 (enrdf_load_stackoverflow) 1971-06-18
ES189981Y (es) 1974-10-16
DE1948704A1 (de) 1971-04-01
GB1253117A (enrdf_load_stackoverflow) 1971-11-10
YU34843B (en) 1980-04-30
DE1948704B2 (de) 1976-03-11
ES189981U (es) 1974-04-16

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