EP1788230A1 - Récipient de rétention pour un système de traitement des vapeurs de carburant avec un bloc de charbon actif constitué monolitique et son procédé de fabrication - Google Patents

Récipient de rétention pour un système de traitement des vapeurs de carburant avec un bloc de charbon actif constitué monolitique et son procédé de fabrication Download PDF

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Publication number
EP1788230A1
EP1788230A1 EP05025302A EP05025302A EP1788230A1 EP 1788230 A1 EP1788230 A1 EP 1788230A1 EP 05025302 A EP05025302 A EP 05025302A EP 05025302 A EP05025302 A EP 05025302A EP 1788230 A1 EP1788230 A1 EP 1788230A1
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EP
European Patent Office
Prior art keywords
block
canister
chamber
covering
last
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.)
Withdrawn
Application number
EP05025302A
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German (de)
English (en)
Inventor
Pawel Zuchara
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP05025302A priority Critical patent/EP1788230A1/fr
Publication of EP1788230A1 publication Critical patent/EP1788230A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0854—Details of the absorption canister

Definitions

  • the invention relates to a canister for evaporated fuel processing system, having a number of adsorbing chambers, wherein the last chamber is connected with an atmospheric port and comprises a monolithically formed block of activated carbon.
  • the invention relates also to a method for manufacturing such a canister.
  • a typical canister of the above kind is disclosed e.g. in the U.S. patent application 2002/0078931 or European patent application 04460022.9 co-owned by the present applicant.
  • canisters contain an additional adsorbing chamber (a so called scrubber), where a monolithically formed block of activated carbon is placed.
  • the scrubber may be either a separate chamber connected with the canister housing through a pipe (cf. Fig. 2) or form a part of appropriately moulded canister housing (cf. Fig. 1).
  • the monolithically formed block of activated carbon usually has a honey-comb or similar structure, enabling a unidirectional flow of vapors, and is typically sealed with the housing of the scrubber by two sealings usually made of fluorosilicone rubber, surrounding its top and bottom sides.
  • the sealings greatly impair the costs of a canister.
  • the object of the present invention is to provide a canister having an improved and uncomplicated construction, which increases its tightness, enables its manufacturing in a more efficient and economic manner and protects the block against vibrations of the car chassis.
  • a canister where the monolithically formed block of activated carbon is surrounded, at least from its atmospheric port side, by plastic covering.
  • Such a construction enables to achieve a perfect tight sealing of the block, protects the block against vibrations of the canister in the car and, as only one inexpensive additional element is required, is much more efficient when compared to known solutions.
  • the covering is preferably made of polyurethane. Closed cells of the polyurethane foam generate a high restriction level, so that it is virtually impossible for the flow of vapors to by-pass the block.
  • the covering has advantageously a form of a separate tubular element, e.g. a segment of a plastic pipe.
  • the block may also be coated with covering prior placing in the last adsorbing chamber.
  • the covering may have a form of a filler between the outer casing of the block and the inner casing of the last adsorbing chamber.
  • the covering shall be formed e.g. by supplying polyurethane foam into a space between the block and the housing of the last adsorbing chamber.
  • the last adsorbing chamber comprises a filter placed at the atmospheric port, which is glued to the covering.
  • the filter protects the detection module tank leak (Onboard Diagnostic System OBD II) pump used to check the tightness of the installation from damage by big carbon particles.
  • the block is advantageously distanced from the atmospheric port side of the last adsorbing chamber.
  • the block adjoins the opening of the chamber or the filter placed on the opening, the fragment of the block is normally unavailable for the flow of vapors, as during purging of the system, the vapors flow mainly through the central area of the block.
  • Providing a distance between the block and the atmospheric port opening of the chamber substantially increases an effective purge zone, and lowers the restrictions for the vapors flowing through the block.
  • a method of manufacturing a canister for evaporated fuel processing system comprising the steps of:
  • said method comprises the step of placing a filter at the bottom of the form.
  • the filter is consequently automatically glued to the covering with no need of additional technological operation, e.g. ultrasonic welding.
  • said method comprises the step of placing a separator between the filter and the block.
  • the form is the last adsorbing chamber of the canister, which substantially increases the vapor-tightness of the chamber.
  • the method of the invention substantially reduces the number of steps required to manufacture the scrubber and is preferably implemented as a separate technological step on a canister assembly line.
  • Each canister 1 contains two serially connected adsorbing chambers 2 and 3 and a scrubber 4 containing the last adsorbing chamber, where the first chamber 2 is connected with the fuel tank (not shown) through the inlet port 5 and with the intake pipe of an engine through the outlet port 6. After passing through the adsorbent layers of the first chamber 2 and subsequently of the second chamber 3, fuel vapors enter the last adsorbing chamber of the scrubber 4, from which they are eventually discharged into the surrounding atmosphere through the atmospheric port 7.
  • the atmospheric port 7 of the canister 1 is additionally connected with the OBD II pump (not shown) used to check the tightness of the fuel installation.
  • the last adsorbing chamber of the canister 1 shown in Fig. 1 is integrated with the canister housing, while in Fig. 2 it forms a separate element connected with the canister via pipe 8. In any case, however, its operating principles are the same.
  • the scrubber 4 according to an embodiment of the present invention, is shown exploded in Figs. 3a and 3b with all its characteristic elements.
  • the scrubber 4 comprises a cylindrical hollow housing 9 with an atmospheric port 7, which after assembling the scrubber is tightly closed by a cylindrical cap 11.
  • the housing 9 forms an adsorbing chamber 10 containing a block 12 of activated carbon surrounded by a covering 13 made of polyurethane foam.
  • a covering 13 made of polyurethane foam.
  • the scrubber 4 comprises a flat filter 14, glued below the polyurethane covering 13 at the bottom of adsorbing chamber 10.
  • the filter 14 protects the outlet 7 from possible clogging by the block particles that may crumb.
  • the height of the polyurethane covering 13 is greater than the height of the block 12, therefore, when the block 12 is surrounded by the covering 13 in the interior of the covering 13, below the block 12 a hollow space is formed.
  • the space defines a purge zone 15, which decreases restrictions for air flow through the block 12 and increases effective purge area in the block 12. Purging of the block 12 normally takes place after starting the engine, when the vapours are inducted by negative pressure of the intake pipe and then burnt inside the combustion chamber.
  • Fig. 4 shows schematically a cross-section of the scrubber 4 after its assembling.
  • the optimal height H of the purge zone 15 should be theoretically equal to three block diameters D. Obviously in practical embodiments, due to constructional limitations it shall be lower.
  • Fig. 5 shows schematically a process of manufacturing an integrated scrubber module 4 according to the invention.
  • the process begins with placing a filter 14 at the bottom of the scrubber housing 9 defining the last adsorbing chamber 10. Afterwards, on the filter 14 there is placed a separator in a form of a cylinder sleeve 16 and a honeycombed activated carbon monolith block 12, where diameters of the sleeve 16 and the block 12 are equal. By distancing the block 12 from the filter 14, the spacing sleeve 16 defines a purge zone 15 below the block 12.
  • a moulding head 17 connected to a polyurethane feeding aggregate (not shown) is inserted into the space between block 12 and the housing 9.
  • the head 17 injects polyurethane foam into the space between the block 12 and the housing 9 stowing this space with polyurethane and forming a covering 13.
  • Other forms of plastic, such as polyethylene, are also allowed.
  • the process may also be realized in a separate tubular form, what, after removing the form, shall result in an integrated covering-filter-block unit. Nevertheless forming the covering directly in the housing 9 substantially improves the vapor-tightness of the scrubber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
EP05025302A 2005-11-19 2005-11-19 Récipient de rétention pour un système de traitement des vapeurs de carburant avec un bloc de charbon actif constitué monolitique et son procédé de fabrication Withdrawn EP1788230A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05025302A EP1788230A1 (fr) 2005-11-19 2005-11-19 Récipient de rétention pour un système de traitement des vapeurs de carburant avec un bloc de charbon actif constitué monolitique et son procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05025302A EP1788230A1 (fr) 2005-11-19 2005-11-19 Récipient de rétention pour un système de traitement des vapeurs de carburant avec un bloc de charbon actif constitué monolitique et son procédé de fabrication

Publications (1)

Publication Number Publication Date
EP1788230A1 true EP1788230A1 (fr) 2007-05-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05025302A Withdrawn EP1788230A1 (fr) 2005-11-19 2005-11-19 Récipient de rétention pour un système de traitement des vapeurs de carburant avec un bloc de charbon actif constitué monolitique et son procédé de fabrication

Country Status (1)

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EP (1) EP1788230A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2071172A1 (fr) * 2007-12-13 2009-06-17 Delphi Technologies, Inc. Récipient doté d'un filtre surmoulé
US20130291839A1 (en) * 2012-05-02 2013-11-07 Ford Global Technologies, Llc Bleed Element With Overmolded Seal for Evaporative Emissions Canister
KR20160062940A (ko) * 2014-11-26 2016-06-03 현대자동차주식회사 캐니스터의 삽입형 필터 및 삽입형 필터를 갖춘 캐니스터
US11591990B2 (en) 2020-03-27 2023-02-28 Ingevity South Carolina, Llc Low emission adsorbent and canister system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584514A (en) * 1978-12-22 1980-06-25 Hitachi Ltd Evaporated fuel trap unit
US5641344A (en) * 1994-12-05 1997-06-24 Tsuchiya Mfg., Co., Ltd. Fuel vapor treatment device
FR2752750A1 (fr) * 1996-09-03 1998-03-06 Renault Absorbeur de vapeur d'hydrocarbure a cloison permeable
US20020078931A1 (en) 2000-12-25 2002-06-27 Aisan Kogyo Kabushiki Kaisha Canister
EP1496239A2 (fr) 2003-07-11 2005-01-12 Delphi Technologies, Inc. Récipient de rétention pour un système des vapeurs de carburant
US20050172938A1 (en) * 2002-07-16 2005-08-11 Masashi Uchino Fuel vapor treatment device
FR2868360A1 (fr) 2004-03-30 2005-10-07 Inergy Automotive Systems Res Canister pour reservoir a carburant

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584514A (en) * 1978-12-22 1980-06-25 Hitachi Ltd Evaporated fuel trap unit
US5641344A (en) * 1994-12-05 1997-06-24 Tsuchiya Mfg., Co., Ltd. Fuel vapor treatment device
FR2752750A1 (fr) * 1996-09-03 1998-03-06 Renault Absorbeur de vapeur d'hydrocarbure a cloison permeable
US20020078931A1 (en) 2000-12-25 2002-06-27 Aisan Kogyo Kabushiki Kaisha Canister
US20050172938A1 (en) * 2002-07-16 2005-08-11 Masashi Uchino Fuel vapor treatment device
EP1496239A2 (fr) 2003-07-11 2005-01-12 Delphi Technologies, Inc. Récipient de rétention pour un système des vapeurs de carburant
FR2868360A1 (fr) 2004-03-30 2005-10-07 Inergy Automotive Systems Res Canister pour reservoir a carburant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 135 (C - 025) 20 September 1980 (1980-09-20) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2071172A1 (fr) * 2007-12-13 2009-06-17 Delphi Technologies, Inc. Récipient doté d'un filtre surmoulé
US20130291839A1 (en) * 2012-05-02 2013-11-07 Ford Global Technologies, Llc Bleed Element With Overmolded Seal for Evaporative Emissions Canister
US8881710B2 (en) * 2012-05-02 2014-11-11 Ford Global Technologies, Llc Bleed element with overmolded seal for evaporative emissions canister
KR20160062940A (ko) * 2014-11-26 2016-06-03 현대자동차주식회사 캐니스터의 삽입형 필터 및 삽입형 필터를 갖춘 캐니스터
US10107234B2 (en) 2014-11-26 2018-10-23 Hyundai Motor Company Insertable filter for canister and canister having the filter
US11591990B2 (en) 2020-03-27 2023-02-28 Ingevity South Carolina, Llc Low emission adsorbent and canister system
US11773810B2 (en) 2020-03-27 2023-10-03 Ingevity South Carolina, Llc Low emission adsorbent and canister system

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