• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a cooking appliance muffle (1) having a support structure essentially made of sheet metal and having a heating element (20), wherein between the heating element and the muffle interior a glass ceramic plate (25) is arranged in a window-like opening of the support structure of the muffle made of sheet metal, and between the support structure made of sheet metal and the glass ceramic plate (25) an adhesive gap for bonding the glass ceramic plate (25) with the support structure made of sheet metal by means of an adhesive (70, 75) is provided, wherein the support structure at the window-like opening (9) Angled (10). In the adhesive gap, a further component (46, 47) is provided in addition to the adhesive (70, 75).
    公开号:CH705626B1
    申请号:CH01552/12
    申请日:2012-08-30
    公开日:2016-02-29
    发明作者:Olivier Hoffmann；Radwane Oumghari；Matthieu Schneider
    申请人:BSH Hausgeräte GmbH；
    IPC主号:
    专利说明:

    The invention relates to a cooking appliance muffle with a glass ceramic plate to cover the heating unit.
    Furnaces with glass ceramic covers of the grill are well known. Thus, from DE 19 853 780 A1 discloses a cooking oven with a heater is known in which the heating is separated by means of a glass ceramic plate from the cooking chamber interior. DE 10 2006 020 914 and DE 10 241 486 disclose a glass ceramic which, lying on the bottom of the muffle, separates the heating element underneath from the cooking chamber interior. The advantage of the glass-ceramic is that it allows the heat to reach the interior and at the same time is easy to clean.
    In the known embodiments, the problem of attachment of the glass ceramic to the muffle, which is usually made of a metal sheet, preferably stainless steel. Also arises for the heating element, especially if it is to be used as a grill, the problem that must be cut out of the muffle a large window. In order to be able to grill the food as evenly as possible, a window is required at the top of the muffle, which can make up a considerable part, namely at least 40%, preferably about 60-80% of the entire top of the muffle. As a result, the strength, in particular the torsional stiffness, the muffle is greatly reduced. The object of the present invention is to provide an attachment for a glass-ceramic cover, which is inexpensive to manufacture, which either minimally reduces or even increases the stability of the muffle. Furthermore, the surface on the muffle inside should be free of marks, discoloration and / or welding points.
    This object is solved by the features of claim 1. Advantageous further embodiments emerge from the dependent claims.
    A cooking appliance muffle has a substantially made of sheet metal support structure and a heating element, wherein between the heating element and the muffle interior a glass ceramic plate is arranged in a window-like opening of the support structure of the muffle, and between the support structure and the plate is an adhesive gap for bonding the plate provided with the support structure by means of an adhesive. In this case, the support structure on the window-like opening on an angled portion. In the bonding gap, another component is provided in addition to the adhesive. Preferably, this component may be a metal sheet, a tissue mat, a fleece or a glass fiber tube or the like. The heating element can be designed in particular as an infrared heating element. The position of the heating element can be provided alternatively or additionally also on the sides of the muffle, the rear wall or at the bottom thereof. Also, a plurality of heating elements and heat-permeable plates is possible.
    An advantage of the inventive embodiment is that the adhesive gap is divided by the recorded in the adhesive gap component into several Teilklebespalten or partial adhesive areas. Since the adhesive can only bridge a material gap given maximum gap height for ideal bonding, can be achieved by Teilklebespalten that the total gap can be performed with a larger gap width. The increased gap width means that the bend can be made with a greater length. The higher the length of the bend, the stronger the strength of the muffle against twisting increases. The increased torsional rigidity over the larger adhesive gap thus ensures less stress on the bonding of the plate in use of the device. Likewise, the dimensional stability of the muffle increases against changes in shape, which can result from the heating.
    As a further advantage is to be mentioned that the attachment of the plate is done substantially or practically exclusively by the bonding. Traditionally, welding studs are permanently welded to the muffle, which can cause welding and heat marks on the interior of the muffle, and the glass ceramic plate is fastened with these welding studs. In the present case, no such welding studs are required, and instead only welding studs are attached to the mold with only low welding strength, in order to position and hold the individual parts during manufacture, a lower welding energy can be used, whereby said markings do not arise.
    Preferably, the further component is another sheet. A sheet is a cost-effective component, which can be accurately positioned by simple means and by which it is possible to divide the entire gap into neatly defined sub-column, in which can be provided for ideal conditions of bonding.
    More preferably, the further component is guided in the adhesive gap substantially parallel to the metal sheet of the muffle, whereby the Teilklebespalte are the same thickness. It is in the adhesive gap substantially spaced both relative to the metal of the muffle and the glass ceramic. The further component touches the sheet metal of the muffle and / or the glass ceramic at best at defined support points, which make up only a small part of the surface of the other component.
    In particular, the bend is designed as a stamping offset. An embossing offset can also be understood alternatively or in particular as a Z-shaped bend, in which the offset region is parallel to the non-offset region. As will be explained later in detail, a glass ceramic plate may rest on the offset support surface. Since this contact surface corresponds to the rolled surface of the sheet, which has a very large flatness and low roughness, the gap is minimized compared to the plate as far as possible.
    Furthermore, the term "embossing offset" may also include embossing or deep-drawing in which there is only a simple bend, so that an angled end face of the metal sheet lies in preferably planar contact with the heat-permeable plate. This embossing offset is the glass ceramic plate running circumferentially the same.
    In addition, the further component may be part of a stiffening angle, which is used in particular for stiffening the muffle against twisting. Since a stiffening angle is often necessary on the muffle, tabs formed on it can be guided directly into the adhesive gap, without incurring special costs.
    More preferably, the sheet metal of the other component in the adhesive gap is at least double-layered and the layers are welded together. Thus, for a given thickness of the material of the stiffening angle, a greater gap width increase can be achieved than with a simple material thickness.
    Alternatively, the sheet metal of the other component in the adhesive gap may be at least double-layered, and the layers are substantially spaced apart and glued with a silicone adhesive. So you can get a sandwich construction with, for example, three adhesive layers and two intermediate metal layers, whereby the gap can be further increased. The formulation that the layers are substantially spaced apart, in particular, means that local bulges or projections, which serve to maintain the gap, may be provided.
    In particular, in each case one sheet is provided in the adhesive gap at each of the four edges of the heat-permeable plate. As a result, a symmetrical construction and a uniform increase in the adhesive strength is achieved.
    Furthermore, in the region of the window-like opening weld studs are welded to the sheet metal of the muffle for positioning the glass ceramic plate and / or the further component. These weld studs are not required for the attachment of the glass ceramic itself and in particular their holding forces, but they can significantly simplify the positioning of all fasteners and make more accurate due to their reference point function.
    Further, two weld bolts are provided on each edge of the window-like opening, and the tensile strength of each individual weld does not exceed 90 N, and preferably 65 N is not. By using only two weld bolts, the components can be accurately positioned at each edge, and a larger number of bolts would unnecessarily increase production costs. Accordingly, a lower welding energy can be used, whereby unsightly markings are avoided in the muffle interior.
    In addition, may be provided on the weld bolts spring elements for generating a pressing force of the heat-permeable plate to the bend. This pressure is used only for the bonding and plays after the work of the furnace is no longer essential role. Thus, the spring elements can be removed after curing of the bond without a significant reduction in the strength of the attachment of the heat-permeable plate.
    More preferably, the adhesive is a silicone material, and the further component is a metal sheet, and the sheet has in direct contact with the adhesive openings, holes or perforations, which have the task of diffusing through contained in the ambient curing agents Areas of the adhesive that are removed from its surrounding surface. It is in particular the only task of the openings, holes or perforations to achieve the said relief. Silicone material is intended to serve as an umbrella term for plastics and adhesives that are resistant to high temperatures and are therefore suitable for the interior of a furnace and have a certain elasticity. Thus, this term also includes non-silicone materials that have the properties mentioned. Through these openings, the silicone can cure faster and better. This makes it possible to perform the bonding of the glass ceramic plate in an adhesive process and not, as described in another embodiment below, in two staggered gluing operations.
    Hereinafter, preferred embodiments will be explained in more detail with reference to figures. Show it:<Tb> FIG. 1 <SEP> a perspective view of a furnace muffle with inserted glass ceramic, but without the heating element,<Tb> FIG. 2 <SEP> a perspective view of a section through the muffle with the heating element shown,<Tb> FIG. 3 <SEP> is a perspective view of a section through the muffle looking at the right rear corner of the muffle top,<Tb> FIG. 4 <SEP> two views of the stiffening profile,<Tb> FIG. 5 <SEP> a sectional view through the attachment of the glass ceramic without the representation of the bond,<Tb> FIG. 6 <SEP> the view of FIG. 5 during the production process without the glass ceramic, but with a first bond,<Tb> FIG. 7 <SEP> the view of Fig. 5 with the complete bond and<Tb> FIG. 8 <SEP> an alternative embodiment of the attachment.
    Fig. 1 shows the muffle 1 in a side view with a muffle opening 5, which is closable with a door, not shown. At the top 3 ports 4 are shown for water and air. Further, a glass ceramic plate 25, which is designed as a flat, flat and completely closed disc, resting on a stamping offset 10 of the muffle, is shown. Furthermore, stiffening elements 40 are shown which comprise a substantially rectangular cross-section and serve for the stability of the muffle, in particular its torsional rigidity. The glass ceramic lies approximately in the center of the top of the muffle, and on all four sides an approximately 2-3 cm wide edge is provided, so that the muffle top depends on the specific embodiment to approx 75% +/- 15% is formed by the glass ceramic.
    Fig. 2 shows a vertical section through the muffle 1 through a drain 4, which serves to drain excess water, and also horizontally arranged guide struts as Gargutträgeraufnahmen 3. The glass ceramic plate 25 is shown as a section, and above it is a heating element 20, which in the form of a high-iight element as an infrared heater through the glass ceramic plate can heat, cook and grill the underlying food.
    Fig. 3 shows the section of Fig. 2 from another view, namely obliquely from the muffle inner looking at the rear right corner of the muffle. Shown is the muffle 1 with the Gargutträgeraufnahme 3. On the sides and the rear wall of the muffle, the sheet of muffle goes over in the top, which includes a flat portion 11 which extends to all four sides of the glass ceramic 25 and is parallel to it. For the glass ceramic, a window 9 is provided in the muffle top, and at the edge of the window is a stamping offset 10, which includes an obliquely or perpendicularly facing in the direction of the glass ceramic edge 12, which merges into a support surface 13 to the glass ceramic 25. The support surface 13, the entire window 9 is circumferentially closed and has a relation to the flat area 11 offset area, which is parallel to the glass ceramic and on which the glass ceramic rests completely circumferentially without spacing. While, according to FIG. 3, above all a corner is shown, the other three corners and the four edges of the window are correspondingly constructed.
    Fig. 5 shows a section through the attachment of the glass ceramic 25, which initially rests on the support surface 13 of the embossing offset 10, which is designed in one piece over the edge 12 with the metal sheet of the flat surface 11.
    A weld-on bolt 60 is welded to the muffle top 3, in particular in the flat area 11. At the weld stud 60, both the stiffening profile 40 and the spring element 30 are guided and positioned via a screw 65.
    In Fig. 4, the structure of the stiffening angle 40 is shown. It is made of a metal sheet of thickness 0.8 mm and has a rectangular area 43, and at one edge of this area the ends of the sheet are designed as a lower flap 46 and an upper flap 47, which are welded together, in particular spot-welded , and together form the end flap 45. The lower flap 46 has, as shown in FIG. 5, a lower surface which is flat throughout, except for a plurality of embossments 46 formed on the lower flap and projecting 1 mm downwardly. The weld bolt 60 has a lower flange 62 whose top has a distance of 1 mm from the muffle top 3. Thus, the stiffening angle 40 is securely and accurately guided on the lower flange 62 and the embossments 42 with its lower edge parallel to the muffle top. The stiffening profile comprises two bolt openings 49 through which the welding bolts are guided.
    The spring element 30 is located on the top of the rectangular portion 43 of the stiffening angle 40 and has a spring arm 35 which presses from above onto the glass ceramic 25 and thus serves for the uniform support on the support surface 13.
    The production of the bond of the glass-ceramic is described below:
    First, each of the four sides of the window, two weld studs are welded to this purpose. Conventionally, four weld studs were usually welded per side, with a high welding energy, resulting in a tensile strength of 100 N to 200 N per weld stud. The welding energy required for this caused discoloration on the inner side of the muffle, which is visible to the customer. In the present embodiment is welded with a significantly lower energy, so that no marks or discoloration on the inner side of the muffle are apparent. The resulting significantly lower strength values of about 30-50 N tensile strength per weld stud are presently acceptable because in the present case, the welding studs are primarily and preferably only needed for the fixation and positioning of the components during the manufacturing process and not during the continuous use of the grill.
    In the next production step, which is shown in Fig. 6, a silicone adhesive on the top of the muffle outside the edge 12 is applied so that after placing the stiffening angle 40, the area between the bottom of the stiffening element 40 and the muffle top completely filled with the silicone adhesive. As an adhesive, for example, S56 can be used by Ottochemie. This is a 250 ° C temperature-resistant, neutral curing 1-component silicone adhesive with a pasty viscosity and a tensile strength of 2.9 N / mm 2. The adhesive cures via the absorption of atmospheric moisture with appropriate addition reaction. For the curing, it is essential that the moisture can penetrate into the above-described region of the bond. Otherwise, the silicone would not cure, and it could result in the commissioning of the device at the customer negative odor nuisance.
    For the industrial bonding a curing time of about 24 hours is specified. Thereafter, the next production step, namely the gluing of the glass-ceramic plate 25, is continued. First, a second silicone layer 75, wherein the same adhesive can be used, is applied to the top of the upper flap 47, and then the glass-ceramic 25 is inserted. In order to ensure a uniform pressure on the bearing surface 13, the spring element 30 is fastened with the screw 65 on the weld stud 60. This ensures that there is practically no distance between the support surface 13 and the glass ceramic.
    Even after this bonding a duration of about 1 day must be maintained until the second bonding is cured. After this bonding, the spring element 30 could be removed because it is no longer needed for the fatigue strength when using the cooking appliance.
    The strength of the muffle and the attachment of the glass ceramic arise initially from the fact that the stiffening profile 40 is glued to the muffle with a large adhesive surface. Since four stiffening profiles are used circumferentially, the weakening of the muffle caused by the cutting of the window is compensated. By the welding of the lower flap 46 with the upper flap 47 and the upper flap 47 is securely connected to the muffle top. The second bonding the glass ceramic 25 is connected to the upper tab, and so the glass ceramic is securely bonded to the top of the muffle.
    For the bonding, a thickness of the adhesive gap of 1 mm is preferred. With a higher nip width, the adhesive force can be reduced, and with a smaller nip thickness, problems of uniform filling of the nip with the silicone can result and curing is delayed. Thus, the distance from the top of the muffle in the region of the flat surface 11 to the underside of the glass ceramic 25 results in two times 1 mm adhesive gap plus twice the material thickness of 0.8 mm of the upper and lower flap to a total of 3.6 mm. Accordingly, the offset of the support surface 13 with respect to the flat region 11 is also 3.6 mm. By the embossing offset 10, the rigidity of the muffle is significantly increased by that their area moment of inertia is increased. In simple terms, it can be stated that an increase in the offset of the support surface 13 leads to an improvement in the rigidity. Because of the limitation of the maximum adhesive gap due to the material properties of the silicone material, the offset has conventionally been limited to the maximum adhesive gap height, which was 1 mm or up to 1.5 mm. Due to the double bonding with the intermediately mounted tabs, the distance from the glass ceramic to the muffle can be increased and so also the embossing offset 10 can be increased.
    In an alternative, not shown embodiment, the lower flap must not be welded to the upper flap, but there may be a distance of, for example, 1 mm between the tabs, which can be filled with silicone during production, so that the two tabs are glued together.
    For the invention, it is not absolutely necessary that in the gap described sheets, namely the tabs 46 and 47, are introduced. The advantages mentioned can alternatively be achieved with a tissue mat introduced into the gap, such as a glass fiber mat or a glass fiber tube, which are impregnated with the silicone. During production, the glass fiber mat first ensures that the silicone does not flow away. During use of the cooking appliance, the proportion of fiber supports the attachment of the glass ceramic 25.
    FIG. 8 shows an embodiment having a plurality of apertures 51 in the lower tab 46 and further a further plurality of apertures 52 aligned with each other and passing through upper and lower tabs 46 and 47. In the form shown here can be filled in a single step first in the lower gap between the flat portion 11 and the lower tab 46 adhesive and immediately thereafter and without waiting for a first curing the bonding of the glass ceramic plate 25 are performed. This is possible because through the newly added openings the humidity can reach the bonding area for curing. Namely, the diffusion path for the moisture was correspondingly reduced through the openings. The openings 51 are chosen so small that no significant amount of the silicone can escape over them, and so large and so numerous that the curing can take place. After adhesive has been introduced, a bond results, which corresponds to the sum of the bonds 70 and 75 of FIG. 7.
    权利要求:
    Claims (11)
    [1]
    1. cooking appliance muffle (1) with a carrier structure essentially made of sheet metal and with a heating element (20), wherein between the heating element (20) and the muffle interior a glass ceramic plate (25) is arranged in a window-like opening made of sheet metal support structure and between the carrier structure made of sheet metal and the glass ceramic plate (25) is provided with an adhesive gap for bonding the plate (25) to the support structure made of sheet metal by means of an adhesive (70, 75), the support structure made on sheet metal being attached to the window-like opening (9). an angled portion (10), characterized in that in the adhesive gap next to the adhesive (70, 75), a further component (46, 47) is provided.
    [2]
    2. cooking appliance muffle according to claim 1, characterized in that the further component (46, 47) is a further sheet, which is guided in particular in the adhesive gap substantially parallel to the support structure (11) of the muffle and further preferably in the adhesive gap substantially both opposite the support structure of the muffle and the glass ceramic plate (25) is spaced.
    [3]
    3. cooking appliance muffle according to claim 1, characterized in that the bend is designed as a stamping offset (12, 13).
    [4]
    4. cooking appliance muffle according to claim 1 or 2, characterized in that the further component part of a stiffening angle (40), in particular for stiffening the muffle against twisting is.
    [5]
    5. cooking appliance muffle according to one of claims 2 to 4, characterized in that the further metal sheet (46, 47) of the further component in the adhesive gap is at least double-layered and the layers are welded together.
    [6]
    6. cooking appliance muffle according to one of claims 2 to 4, characterized in that the further metal sheet of the further component in the adhesive gap is at least double-layered and the layers are substantially spaced apart and glued.
    [7]
    7. cooking appliance muffle according to one of the preceding claims, characterized in that welded in the region of the window-like opening weld studs (60) on the support structure (11) of the muffle for positioning the glass ceramic plate (25) and / or of the further component.
    [8]
    8. cooking appliance muffle according to claim 7, characterized in that on each edge of the window-like opening two weld bolts are provided and the tensile strength of each weld does not exceed a value of 90 N and preferably does not exceed 65 N.
    [9]
    9. cooking appliance muffle according to claim 7 or 8, characterized in that on the weld stud spring elements (30) are provided for generating a pressing force of the glass ceramic plate (25) to the bend.
    [10]
    10. cooking appliance muffle according to claim 9, characterized in that the spring elements (30) are designed removable.
    [11]
    11. Gargerätemuffel according to one of claims 2 to 10, wherein the adhesive (70, 75) is a silicone material and the further sheet (46, 47) in direct contact with the adhesive openings, in particular holes or perforations (51, 52) ,
    类似技术:
    公开号 | 公开日 | 专利标题
    DE2819118C2|1982-09-23|Heatable surface made of a glass or glass ceramic plate with a glued frame
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    EP1918645B1|2009-12-23|Door for a baking oven
    DE2821662B2|1980-12-04|Built-in hob with a hob made of glass ceramic material
    DE19912452A1|2000-09-21|Installation bar for a cooktop
    DE102012215979A1|2013-04-04|Muffle for cooking apparatus i.e. oven, has heat-permeable plate i.e. glass ceramic plate, arranged between heating element and inner area of muffle, and lower and upper flaps arranged in sticking gap adjacent to adhesive agent
    DE2249483C3|1975-04-10|Installation device for fastening a built-in element such as a built-in sink in a cutout of a plate
    DE3104710C2|1984-12-13|Household appliance door, preferably the oven door of an oven
    EP1882143B1|2018-09-12|Built-in household device with an adjusting rail
    CH713242B1|2021-10-15|Sealing element for sealing a tub corner against a building structure and method therefor.
    DE8004681U1|1980-07-03|OVEN DOOR FOR HOUSEHOLD KITCHEN COOKERS
    DE3736364C2|1989-09-07|
    DE2340818A1|1975-02-27|Heating element support for glass-ceramic hot plate - uses leaf spring to press elements against top surface
    EP2385313B1|2014-10-22|Hotplate
    EP3066394B1|2018-12-26|Baking board and baking oven with baking board
    DE202010000128U1|2010-04-15|kitchen furniture
    EP1426698B1|2006-06-07|Radiator cover grid
    DE2501710C3|1978-11-02|Sealing strip
    DE2227565A1|1974-01-03|CLADDING OF WALLS WITH CLADDING PANELS
    AT502995B1|2010-12-15|FASTENING PART FOR ANCHORING A WINDOW OR DOOR FRAME ON THE WORKING SURFACE OF A WALL OPENING
    DE202020100158U1|2020-01-23|Sheet metal shelf with sound insulation
    DE102008042723B4|2020-06-04|Method for applying a curable sealing compound to a frame element of a hob
    DE102012221622A1|2014-05-28|House door
    DE102006012955A1|2007-09-27|Cover sheet for stove top, has opening areas arranged such that cooking areas overlap with opening areas during covering of stove top with sheet, where opening areas are essentially designed circular
    DE2443368A1|1976-03-25|Double-skinned fire-protection steel door - with reinforcing grill of fire-retarding protective chipboards between panels
    同族专利:
    公开号 | 公开日
    DE102012215979A1|2013-04-04|
    CH705626A2|2013-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19853780A1|1998-11-21|2000-01-05|Aeg Hausgeraete Gmbh|Domestic cooking oven|
    DE10241486B4|2002-06-17|2007-03-08|Electrolux Home Products Corporation N.V.|Garofenmuffel with a arranged above the muffle bottom heat radiator|
    DE102006020914A1|2006-05-05|2007-11-08|Electrolux Home Products Corp. N.V.|Garofen, in particular household oven|ITUB20152566A1|2015-07-28|2017-01-28|Johann Pichler|Device for fixing a muffle furnace to a side-by-side piece of furniture|
    法律状态:
    2015-09-15| PFA| Name/firm changed|Owner name: BSH HAUSGERAETE GMBH, DE Free format text: FORMER OWNER: BSH BOSCH UND SIEMENS HAUSGERAETE GMBH, DE |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11290450|2011-09-29|
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