EP2837893A1 - Kochanwendung mit Dichtung - Google Patents

Kochanwendung mit Dichtung Download PDF

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Publication number
EP2837893A1
EP2837893A1 EP13180399.1A EP13180399A EP2837893A1 EP 2837893 A1 EP2837893 A1 EP 2837893A1 EP 13180399 A EP13180399 A EP 13180399A EP 2837893 A1 EP2837893 A1 EP 2837893A1
Authority
EP
European Patent Office
Prior art keywords
gasket
reinforcement sleeve
cooking appliance
appliance according
butt joint
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.)
Granted
Application number
EP13180399.1A
Other languages
English (en)
French (fr)
Other versions
EP2837893B1 (de
Inventor
Marco Böckler
Branko Ivanovic
Matthias Walter
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.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP13180399.1A priority Critical patent/EP2837893B1/de
Publication of EP2837893A1 publication Critical patent/EP2837893A1/de
Application granted granted Critical
Publication of EP2837893B1 publication Critical patent/EP2837893B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/02—Doors specially adapted for stoves or ranges
    • F24C15/021—Doors specially adapted for stoves or ranges sealings for doors or transparent panel

Definitions

  • the present application is directed to a cooking appliance, in particular to a steam oven, comprising a gasket with at least one longitudinally extending hollow chamber for providing a sealing between a structure surrounding a cooking chamber of the cooking appliance and a corresponding closure member.
  • gaskets are provided between the cooking chamber of the cooking appliance and a corresponding closure member such as a door or lid to avoid fluctuation in temperature and / or escaping of steam.
  • the gasket can be provided at the closure member of the cooking appliance and / or at the circumference of the cooking chamber of the cooking appliance itself which is closed by the closure member.
  • a cooking appliance with a gasket is known from GB 723 277 A for example.
  • the gasket is formed as a tube and is made of silicone rubber or glass fibre woven into a tube.
  • the known gasket comprises a length of rope formed by a plurality of interwoven fibrous glass yarns with two free ends wherein the ends of the rope are brought together to form a joint.
  • a termination sleeve is positioned around the joint formed by the two free ends to keep the joint secure and the rope from fraying.
  • the termination sleeve is a preformed tube sufficiently soft to essentially conform to the shape of the rope at the joint.
  • DE 103 50 197 B4 the free ends of a gasket are connected with each other by heat-resistant adhesive.
  • a sleeve is putted on the blunt ends of the gasket whose joints are arranged opposite to another and form a butt joint.
  • a cooking appliance comprising an endless gasket which ensures a homogeneous sealing behaviour between a cooking chamber and a corresponding closure member of the cooking appliance and which can be easily installed shall be provided.
  • a cooking appliance in particular a steam oven comprising a gasket with at least one longitudinally extending hollow chamber for providing a sealing between a structure surrounding a cooking chamber of the cooking appliance and a corresponding closure member.
  • the gasket comprises two free ends, wherein the free ends are connected with each other by an adhesive to form a butt joint and wherein a reinforcement sleeve is arranged within the at least one longitudinally extending hollow chamber of the gasket in the area of the butt joint.
  • sleeves shall mean any type of a tubular element, which in particular is flexible in radial direction.
  • tubular shall mean providing an hollow interior of any form, for example circular, elliptical, oval or channel-shaped.
  • the gasket as well as the reinforcement sleeve may have any outer contour, for example a profiled outer contour.
  • the at least one longitudinally extending hollow chamber of the gasket and also the hollow interior of the reinforcement sleeve can have a cross section of any form.
  • the gasket may be a tubular gasket of any outer contour with or without one or more sealing lips wherein the hollow interior of the gasket forms a longitudinally extending hollow chamber.
  • the gasket may also be a so-called "hollow section gasket", a gasket providing one or more longitudinally extending hollow chambers with any outer contour and with or without sealing lips. If the gasket provides more than one longitudinally extending hollow chamber only one, some or all may provide a reinforcement sleeve.
  • the invention is based on the recognition that irregularities on the outer contour in the area of a butt joint of a gasket causing sealing problems - for example due to diameter variations or outer profile variations due to an outer jacket surrounding the the butt joint or due to a thick seam or staples used to connect the free ends of a gasket - can be avoided if the free ends of a gasket are connected with each other by an adhesive.
  • the invention is based on the recognition that a butt joint is a weak point in a gasket which shall be used to provide a sealing between the cooking chamber of a cooking appliance and a corresponding closure member, for example between the cooking chamber of a steam oven and its oven door. If the butt joint breaks open the free ends of the gasket can come loose and the effectiveness of sealing is lessened or even no longer existent.
  • the invention is based on the consideration that especially during the assembly of a gasket it is sometimes necessary to stretch and / or bend the gasket to put it into the correct position at the circumference of the cooking chamber and / or at the corresponding door or lid of the cooking appliance.
  • the arising tensile forces and / or bending forces can cause a partial or complete ripping of a gasket at its weak point, the butt joint.
  • bending forces perpendicular to the splice area of a butt joint of a gasket during mounting or during thermal load can easily destroy the butt joint and therewith the sealing capability of the gasket.
  • the outer contour of the reinforcement sleeve is adapted to the inner contour of the at least one longitudinally extending hollow chamber of the gasket.
  • a consistent support of the butt joint or rather the splice can be achieved because the outer contour can lie against the inner contour.
  • the gasket and the reinforcement sleeve are made from the same material.
  • the same material not only the production process can be facilitated, but also unwanted interactions between the materials of gasket and reinforcement sleeve can be prevented.
  • same materials exhibit the same resilience and surface structure the outer contour of a reinforcement sleeve can easily adapted to the inner contour of a gasket and the free ends of a gasket can be easily pushed onto the reinforcement sleeve for example.
  • the reinforcement sleeve is made from a material of less flexibility in comparison to the material of the gasket.
  • tensile forces and / or bending forces occurring during assembly of the gasket or thermal load during use of the gasket can be at least partially "absorbed” or compensated by the areas of the gasket beyond the area of the gasket containing the reinforcement sleeve.
  • these reinforcement sleeves will not bend so strongly if the gasket suffers stretching and / or bending, rather the areas of the gasket beyond the area of the gasket containing the reinforcement sleeve will be stretched or bent first.
  • the risk of damaging of the butt joint or rather a break up of the splice can be reduced. Fitting or replacement of the gasket around the cooking chamber or at the corresponding closure member of the cooking appliance will be facilitated.
  • the gasket is made from a material based on silicone.
  • Silicone based materials for example silicone rubber are especially suited for gaskets for cooking appliances because they can withstand high temperatures and provide a gas-tight seal because of their resilience.
  • the reinforcement sleeve is made from glass fibre reinforced plastic, also called "fibreglass".
  • the plastic material may be epoxy, a thermosetting plastic or thermoplastic.
  • glass fibre reinforced plastic with a plastic matrix of thermosetting plastic is an advantageous material for the reinforcement sleeve: Because due to the three-dimensional network of bonds it is strong and suited for high-temperature applications. Hence it is especially suited for gaskets of cooking appliances.
  • a reinforcement sleeve made from glass fibre reinforced plastic still provides flexibility in radial direction, whereby the sealing function of the gasket can be maintained even in the area where the reinforcement sleeve is arranged.
  • a safe cooking appliance can be provided with which injuries of users can be avoided and stable conditions within the cooking chamber can be achieved.
  • the gasket may be made of a material based on silicone.
  • the reinforcement sleeve comprises a lower flexibility in comparison to the gasket itself, whereby possible forces occurring during assembly of the gasket in the cooking appliance or use of the cooking appliance will have a stronger effect on the areas of the gasket beyond the area of the gasket containing the fibreglass reinforcement sleeve. Through this strain onto the butt joint can be reduced and a ripping of the butt joint avoided.
  • the flexibility of the reinforcement sleeve can adapted by additionally providing a wire mesh, especially a metal-wire mesh.
  • a wire mesh especially a metal-wire mesh.
  • the flexibility of the reinforcement sleeve can be reduced in a targeted manner by providing a wire mesh of corresponding mesh size or material thickness.
  • the reinforcement sleeve is made from glass fibre fabric.
  • Glass fibre is an inert material which is heat-resistant and insensitive to steam or moisture and therefore especially suited for gaskets for cooking appliances.
  • a reinforcement sleeve made from glass fibre fabric is flexible in radial direction whereby the sealing effect of the gasket in the area with the reinforcement sleeve can be maintained because a deformation of the reinforcement sleeve is possible.
  • the glass fibre fabric can be impregnated or coated with silicone.
  • the reinforcement sleeve can be especially used with a gasket made from a material based on silicone.
  • the glass fibre fabric is knitted or braided.
  • Dependent on mesh size of the fabric or strength of braiding the flexibility of the reinforcement sleeve can be adapted to the flexibility of the gasket.
  • Especially the flexibility of the reinforcement sleeve can be reduced in a targeted manner, so that its flexibility is lower in comparison to the flexibility of the gasket for better protection of the butt joint or rather the splice from ripping or breaking open.
  • the reinforcement sleeve is made from wire fabric, in particular from metal wire fabric.
  • wire fabric in particular from metal wire fabric.
  • glass fibre fabric wire fabric can withstand high temperatures whereby it is suited to be used for gaskets for cooking appliances.
  • the reinforcement sleeve is made from a combination of glass fibre fabric and wire fabric.
  • the reinforcement sleeve comprises a sleeve made from glass fibre fabric which is surrounded by a sleeve of wire fabric or vice versa.
  • glass fibres and wires are knitted or braided with each other to form a sleeve.
  • the flexibility of the reinforcement sleeve can easily adapted to provide a suited support of the butt joint or rather the splice.
  • the reinforcement sleeve is made of glass fibre fabric in embodiments in which the reinforcement sleeve is made from wire fabric or made from a combination of glass fibre fabric and wire fabric a coating or impregnation with silicone can be provided. Further on, the flexibility can be adjusted by choice of mesh size of the fabric or strength of braiding if the fabric is knitted or braided.
  • the reinforcement sleeve is filled inside.
  • the flexibility of the reinforcement sleeve can be reduced or rather the support of the butt joint and its splice by the reinforcement sleeve can be increased and / or adapted in a targeted manner with respect to the material of the gasket.
  • an optimum relation between flexibility of the material of the gasket and the flexibility of the material of the filled reinforcement sleeve can be adjusted.
  • the reinforcement sleeve is symmetrically arranged within the at least one longitudinally extending hollow chamber of the gasket with respect to the butt joint.
  • the reinforcement sleeve extends at least 1 cm to 5 cm, particularly 3 cm, within the gasket in both directions with respect to the butt joint. That means the reinforcement sleeve has a total length of at least 2 to 10 cm, particularly 6 cm in case of a symmetrical arrangement of the reinforcement sleeve in the gasket with respect to the butt joint.
  • the reinforcement sleeve is fixed within the gasket by an adhesive.
  • an adhesive thereby an unintentional shifting or moving of the reinforcement sleeve within the gasket can be avoided.
  • a symmetrical or other preferred arrangement of the reinforcement sleeve with respect to the butt joint can be ensured.
  • the reinforcement sleeve is wetted with the adhesive before the free ends of the gasket are pushed onto the reinforcement sleeve.
  • adhesive the same adhesive as for the connection of the free ends can be used.
  • an heat-resistant and resilient adhesive on silicone basis can be used.
  • the reinforcement sleeve is fixed to the gasket by at least one fastening element with a hook-shaped or loop-shaped upper part and a hook-shaped bottom part configured to be inserted through openings in the gasket and the reinforcement sleeve aligned below each other and to establish a connection between the gasket and the reinforcement sleeve in the assembled state. It is known for example to fix gaskets to structures via fastening elements with a hook-shaped or loop-shaped upper part and a hook-shaped bottom part which is inserted through openings in the gasket.
  • the bottom part of the fastening element can be passed through this openings as well whereby a connection between the reinforcement sleeve and the gasket can be built and unintentional shifting or movement of the reinforcement sleeve can be avoided and a good sealing quality and support of the butt joint can be ensured.
  • the reinforcement sleeve can be additionally fixed to the gasket by an adhesive as aforementioned.
  • the gasket is fixed to the structure surrounding the cooking chamber or to the closure member by an adhesive and / or by at least one fastening element.
  • the same adhesive could be used for fixing the gasket to the structure surrounding the cooking chamber or to the closure member.
  • the reinforcement sleeve is fixed to the gasket by at least one fastening element with a hook-shaped or loop-shaped upper part this upper part can be used to fix the gasket to the structure surrounding the cooking chamber or to the closure member assumed that a corresponding counterpart is provided.
  • the fastening element has a double function, namely fixation of the reinforcement sleeve to the gasket and fixation of the gasket to the structure surrounding the cooking chamber or to the corresponding closure member.
  • the gasket can be arranged around the cooking chamber and / or at the door or lid of a cooking appliance.
  • FIG. 1 shows a schematic plan view of an opened steam oven 2.
  • the steam oven 2 has a control panel 4 with electronic programmer 5 and water drawer 6.
  • a heating element 10 Within the cooking chamber 8 of the steam oven 2 a heating element 10, a fan 12 and a steam generator 14 are provided.
  • a circumferential gasket 16 serves to provide a sealing between the cooking chamber 8 of the steam oven 2 and a not depicted oven door.
  • the gasket 16 can be arranged around the window 18 of an oven door 20 to provide a sealing between the cooking chamber 8 of the steam oven 2 and the oven door 20 in its closed position ( FIG. 2 ).
  • the endless or "closed-loop" gasket 16 is built by a butt joint 22 of the free ends 24, 26 of the gasket 16.
  • FIG. 3 which shows an exploded view of the gasket 16
  • the blunt free ends 24, 26 of the gasket 16 are pushed onto a reinforcement sleeve 28 to form a butt joint 22 as indicated by the arrows.
  • the joints 30, 32 or end faces of the free ends 24, 26 are wetted with an adhesive to form a stable splice between the joints 30, 32 or rather a stable butt joint 22.
  • the outer surface of the reinforcement sleeve 28 can be wetted with adhesive, too, before pushing on the free ends 24, 26 of the gasket 16.
  • FIG. 4 shows an exploded view of a part of the gasket 16.
  • Gasket 16 as well as reinforcement sleeve 28 are provided with openings 34, 36 in form of slits through which a fastening element 38 can be pushed through.
  • the fastening element 38 provides a loop-shaped upper part 40 and a hook-shaped bottom part 42.
  • the hook-shaped bottom part 42 penetrates from the outside at first the opening 34 in the gasket 16 and then a corresponding opening in the reinforcement sleeve 28 - which is present not visible in FIG. 4 because it is covered by the gasket 16.
  • the hook-shaped bottom part 42 interlocks with the reinforcement sleeve 28 and thereby fixes the reinforcement sleeve 28 to the gasket 16. Due to its loop-shaped upper part 40 the fastening element 38 besides can be used for fixation of the gasket 16 to the periphery of the cooking chamber 8 of the steam oven 2. To provide a good and stable fixation of the reinforcement sleeve 28 to the gasket 16 both free ends 24, 26 are fixed with a fastening element 38 to the reinforcement sleeve 28.
  • the outer contour of the reinforcement sleeve 28 is adapted to the inner contour of the gasket 16.
  • the reinforcement sleeve 28 has a slightly smaller outer diameter in comparison to the inner diameter of the gasket 16 to facilitate the arrangement of the reinforcement sleeve 28 within the longitudinally extending hollow chamber 44 of the gasket 16 or rather the cavity of the free ends 24, 26 of the gasket 16.
  • the reinforcement sleeve 28 has a total length of 6 cm and is arranged symmetrically within the hollow chamber 44 of the gasket 16 with respect to the butt joint 22 or rather its splice. That means 3 cm of the reinforcement sleeve 28 are arranged within the free end 24 and 3 cm of the reinforcement sleeve 28 are arranged within the free end 26.
  • the present gasket is made from silicone rubber.
  • FIG. 5 shows the reinforcement sleeve 28 in more detail.
  • the reinforcement sleeve 28 consists of a glass fibre fabric reinforced by a wire fabric. Glass fibres 46 and wires 48 are interwoven or braided with each other and are coated with silicone. Because the gasket 16 made from silicone rubber provides a higher flexibility in comparison to the reinforcement sleeve 28 a damage of the splice at the butt joint 22 due to stretching or bending forces due to thermal load during use of the gasket 16 or due to installation of the gasket 16 in the steam oven 2 can be avoided.
  • FIG. 6 shows a filling 50 of a reinforcement sleeve 28.
  • the optional filling 50 can be a fibreglass or silica rope.
  • the filling 50 has a smaller cross section with respect to the cross section of the reinforcement sleeve 28 to facilitate its insertion into the reinforcement sleeve 28.
  • FIG. 7 shows a cross sectional view of an alternative gasket 52.
  • the gasket 52 is made from silicone rubber and has a profiled outer contour 58.
  • the reinforcement sleeve 56 is made from glass fibre reinforced plastic and is additionally reinforced by a not-visible wire mesh.
  • the reinforcement sleeve 56 is arranged within a longitudinally extending hollow chamber 60 of the gasket 52. It can be seen that the cross section of the reinforcement sleeve 56 does not completely fill the cross section of the hollow chamber 60.
  • Reinforcement sleeve 56 is arranged in the hollow chamber 60 in the same manner and provides the same length as reinforcement sleeve 28 of gasket 16.
EP13180399.1A 2013-08-14 2013-08-14 Dampfofen mit einer Dichtung Not-in-force EP2837893B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13180399.1A EP2837893B1 (de) 2013-08-14 2013-08-14 Dampfofen mit einer Dichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13180399.1A EP2837893B1 (de) 2013-08-14 2013-08-14 Dampfofen mit einer Dichtung

Publications (2)

Publication Number Publication Date
EP2837893A1 true EP2837893A1 (de) 2015-02-18
EP2837893B1 EP2837893B1 (de) 2016-11-16

Family

ID=48998455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13180399.1A Not-in-force EP2837893B1 (de) 2013-08-14 2013-08-14 Dampfofen mit einer Dichtung

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Country Link
EP (1) EP2837893B1 (de)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB723277A (en) 1952-09-18 1955-02-02 Simplex Electric Co Ltd Improvements in or relating to sealing means for the doors or other closure members of ovens and the like
US3781021A (en) * 1970-08-26 1973-12-25 Dunlop Holdings Ltd Flame resistant seals
US3812316A (en) 1973-03-28 1974-05-21 Gen Electric Door seal gasket for combined microwave and self-cleaning oven
EP0851177A1 (de) * 1996-12-18 1998-07-01 POSA S.p.A. Dichtung aus Elastomer, insbesondere für Backofentür
US20040026874A1 (en) 2002-08-07 2004-02-12 Davlyn Manufacturing Company, Inc. Rope gasket with termination
US20050198909A1 (en) * 2004-03-12 2005-09-15 Mi Qiang Sealing device
DE102004039434A1 (de) * 2004-08-13 2006-02-23 BSH Bosch und Siemens Hausgeräte GmbH Gargerättürdichtung
DE10350197B4 (de) 2003-10-28 2006-03-30 Biw Isolierstoffe Gmbh Befestigung und Verbindung von Dichtungen für Anwendung bei hohen Temperaturen, insbesondere für Backofentüren
EP2330356A1 (de) * 2009-12-02 2011-06-08 BSH Bosch und Siemens Hausgeräte GmbH Türdichtungsstrang und Gargerät
US20130097937A1 (en) * 2011-10-24 2013-04-25 Davlyn Manufacturing Company, Inc. Glass Fiber Closure Gasket Terminations

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB723277A (en) 1952-09-18 1955-02-02 Simplex Electric Co Ltd Improvements in or relating to sealing means for the doors or other closure members of ovens and the like
US3781021A (en) * 1970-08-26 1973-12-25 Dunlop Holdings Ltd Flame resistant seals
US3812316A (en) 1973-03-28 1974-05-21 Gen Electric Door seal gasket for combined microwave and self-cleaning oven
EP0851177A1 (de) * 1996-12-18 1998-07-01 POSA S.p.A. Dichtung aus Elastomer, insbesondere für Backofentür
US20040026874A1 (en) 2002-08-07 2004-02-12 Davlyn Manufacturing Company, Inc. Rope gasket with termination
DE10350197B4 (de) 2003-10-28 2006-03-30 Biw Isolierstoffe Gmbh Befestigung und Verbindung von Dichtungen für Anwendung bei hohen Temperaturen, insbesondere für Backofentüren
US20050198909A1 (en) * 2004-03-12 2005-09-15 Mi Qiang Sealing device
DE102004039434A1 (de) * 2004-08-13 2006-02-23 BSH Bosch und Siemens Hausgeräte GmbH Gargerättürdichtung
EP2330356A1 (de) * 2009-12-02 2011-06-08 BSH Bosch und Siemens Hausgeräte GmbH Türdichtungsstrang und Gargerät
US20130097937A1 (en) * 2011-10-24 2013-04-25 Davlyn Manufacturing Company, Inc. Glass Fiber Closure Gasket Terminations

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Publication number Publication date
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