EP0947776B1 - Oven with cooling system - Google Patents

Description

The invention relates to a oven for Cooling the outside environment of an oven muffle.

For removing cooking residues, e.g. burnt-on Fat, from the inner walls of an oven muffle Household ovens (baking and roasting ovens) are pyrolytic Self-cleaning (pyrolysis) of the oven muffle known which heats the interior of the muffle to temperatures of up to 500 ° C and the cooking residues in easily removable Ashes are converted. Because of the high temperatures special measures are required for pyrolytic self-cleaning be taken to the muffle door at the front and especially the door handle even during pyrolysis below a critical temperature for humans to keep. Since the users of household ovens in general during a cooking process in the muffle interior wanting to see without having to open the door has an oven muffle door usually an inner pane facing the muffle and an outer pane applied by the muffle on. To even during pyrolytic self-cleaning sufficiently low temperatures on the outer pane ensure is generally in the door between the Inner pane and the outer pane an additional washer used for thermal insulation, and the Oven muffle outside environment is forced convection a cooling fan cooled.

From EP 0 752 561 A1 an oven is known with one of the oven muffle and a door for closing the oven muffle, the front window and an inner window, which are connected to one another via a door housing, and a handle strip for opening and closing above the front window and the door housing (Handle) the door by hand. The handle extends across the entire width of the door and has a horizontal flow diaphragm and an adjoining roof-shaped extension in the front area for manual intervention. This approach is the real handle. A cooling fan is now arranged above the furnace muffle, which sucks in cooling air from a muffle environment and blows out to the front through a blow-out duct formed between the handle and the door housing and the upper edge of the front pane. In the door housing towards the muffle interior there is now a vapor inlet opening for the admission of vapors from the muffle interior into the door interior formed between the front pane, inner pane and door housing, and also in the horizontally running area below the handle strip, an outlet opening designed as a constriction and opening into the blow-out channel through which the vapors and air is sucked out of the door interior by the action of an injector and is blown out to the front with the cooling air. In this known oven, the cooling air is thus guided through the part of the blow-out channel that runs horizontally between the flow orifice of the handle strip and the top of the door housing and then directly meets the handle of the handle strip, which deflects the cooling air obliquely towards the bottom at the front. The handle itself is used to direct the air flow. When a user grips the handle with his hand to open the door, his hand is always in the cooling air flow mixed with the vapor. This can be perceived as uncomfortable, especially because of the soiling of the hand by the vapor and also because of the relatively warm air flow itself.

In another oven known from DE 41 16 999 A1 , the oven door for closing the oven muffle has a handle strip which closes the oven door upwards and extends over the entire door width and projects forward like a roof. The handle bar is designed as an injection molded part and has a breakthrough in a central area, in front of which a bow-shaped or a shell-shaped handle for handling the door is formed. In two lateral areas to the left and right of this handle, the handle bar is in the form of a roof which is initially horizontally drawn towards the front and then closed at the front end and closed and each has an air flow opening. In the furnace housing, outlet openings extending over the entire width of the stove housing are arranged behind the handle strip for blowing out cooling air and vapors heated above the furnace muffle. In order to prevent this heated cooling air and the vapors from hitting the handle, a hump is provided as a flow deflector on the handle bar, and behind the handle in the rear area of the handle bar angled flow deflector ribs are provided. The hump directs a substantial part of the cooling air and vapors emerging from the outlet openings arranged in the middle area in the hearth housing upwards and above the handle. This air flow above the handle also draws air from below through the opening in the handle bar to cool the handle. The flow deflection ribs direct the rest of the cooling air and vapors emerging in the central area directly to the air flow openings in the lateral areas of the handle bar and prevent heated cooling air and vapors from escaping below the handle. In this known oven door a fairly elaborate handle strip is required to split the average air flow into the three partial flows.

A domestic cooking oven is known from US Pat. No. 4,601,279 the cooling air below a door and / or between one Control panel and a channel opening above the door and is blown out through this channel.

The invention is based on the object, a oven door, that can be cooled efficiently, for cooling the outside environment of a muffle in a cooking oven and indicate its oven door.

This object is achieved according to the invention by Oven door with the features of claim 1.

a) eine von der Beschickungsöffnung der Ofenmuffel abgewandte Frontseite, eine der Beschickungsöffnung der Ofenmuffel zugewandte Rückseite und eine obere Seite,

b) einen Türhandgriff (mit der Hand eingreifbarer oder umklammerbarer Handhabungsgriff) an der Frontseite und

c) einen Luftführungsbereich (einen oder mehrere Luftkanäle, Strömungskanäle, Strömungsweg), der an der Rückseite und/oder der oberen Seite wenigstens eine Lufteintrittsöffnung aufweist und an der Frontseite, im allgemeinen in deren oberem Bereich, in wenigstens einer Luftaustrittsöffnung in einen Außenraum (ins Freie) mündet, wobei der Luftführungsbereich an der oder den Lufteintrittsöffnungen eingeströmte oder eingeblasene Luft unterhalb des Türhandgriffes an dem Türhandgriff vorbei, d.h. ohne auf den Türhandgriff zu treffen oder an diesem entlang zu strömen, in den Außenraum führt (leitet), wobei

d) in einer Griffträgerleiste ein Luftleitkörper vorgesehen ist, der eine im wesentlichen horizontal auftreffende Strömung schräg nach unten in einer Umlenkströmung ablenkt, in die auch ein den Türinnenraum von der Kühlluft abschirmender Luftabweiser gerichtet ist, und/oder

e) jede Luftaustrittsöffnung nach unten versetzt zum Türhandgriff angeordnet ist.

The oven door for closing the loading opening of an oven muffle of a oven according to claim 1

a) a front side facing away from the loading opening of the furnace muffle, a rear side facing the loading opening of the furnace muffle and an upper side,

b) a door handle (handle which can be gripped or clasped by hand) on the front and

c) an air duct area (one or more air ducts, flow ducts, flow path) which has at least one air inlet opening on the rear and / or the upper side and on the front side, generally in its upper region, in at least one air outlet opening into an outside space (ins Free) opens, whereby the air duct area at the air inlet opening (s) flows in or blows below the door handle past the door handle, i.e. without hitting the door handle or flowing along it, into the outside space, whereby

d) an air guide body is provided in a handle support bar, which deflects an essentially horizontally impinging flow obliquely downwards in a deflection flow, into which an air deflector shielding the door interior from the cooling air is also directed, and / or

e) each air outlet opening is arranged offset to the door handle.

By blowing out the air below the handle not with the warm one, especially with vapors displaced, air from the oven. Thereby the handle does not serve to guide the flow and does not have to fluidically optimized. The structure of the handle area and the blow-out area is therefore simple and can be designed cost-effectively. At the same time, however Front of the door and thus indirectly the door handle cooled with the air flow emerging from the front become.

In order to achieve that the cooling air at the front below the door handle without touching the door handle is blown out, can now Air routing through the air routing area so that the flow direction from at least one air outlet opening runs obliquely downwards, i.e. the air flow a vectorial pointing downward from the door handle Has component. Each air outlet opening of the air duct area, where this is the case, can also at least partially behind the door handle on the same Height must be arranged.

Advantageous further training, configurations and possible uses the oven door result from the claim 1 dependent claims.

In particular, there can be a continuous air outlet opening or even several air outlet openings in one ventilation grille be arranged. The air outlet openings extend preferably over a large part of the width the front, in particular at least 70% and preferably at least 80% of the front width to achieve a high volume flow the cooling air if the altitude is not too great to enable a viewing window. The door handle too can spread across such a width of the front in horizontal Extend direction.

As a rule, the oven door has an at least partially optically transparent outer pane. The at least one The air outlet opening is then preferably in a cutout the outer pane is formed, and the door handle is due to areas protruding upwards from the cutout the outer pane.

The door handle is in an advantageous embodiment formed as a bow handle and then preferably at least predominantly made of metal, especially stainless steel.

In a further embodiment, the door handle is either as a separate part on one, preferably one Plastic existing and / or horizontal, Handle rack attached or with the handle rack formed in one part.

The oven door is generally used to close the loading opening an oven muffle of a cooking oven is provided, food can be cooked in the muffle interior and preferably also pyrolytic self-cleaning (burning of residues on the inner wall of the muffle at temperatures of at least 500 ° C) can be carried out. The oven also includes a cooling device, the cooling air sucked in from the outside to at least a part the muffle leads and through the air duct area of the Blows out the oven door back into the outside space. Preferably practically all of the intake cooling air (minus of inevitable losses) through the air duct area blown out at the front of the door. It can but only a part of the cooling air can be blown out in this way and another part in a rear area of the oven be blown up or back.

FIG 1

eine Ofenmuffeltür in einer Vorderansicht,

FIG 2

einen oberen Teilbereich einer Ofenmuffeltür in einem seitlichen Schnitt.

FIG 3

einen Garofen in einem seitlichen Schnitt.

Einander entsprechende Teile sind in den FIG 1 bis 3 mit denselben Bezugszeichen versehen.To further explain the invention, reference is made to the drawings, in which an exemplary embodiment according to the invention is shown schematically. Show it

FIG. 1

a muffle door in a front view,

FIG 2

an upper portion of a muffle door in a side section.

FIG 3

a oven in a side cut.

Corresponding parts are provided with the same reference numerals in FIGS. 1 to 3.

1 and 2 show an embodiment of a muffle door (Oven door) 9, which is used to lock one in the 2 and 3 not shown loading opening of a furnace muffle is determined. The door 9 includes a practically over their entire front extending rectangular outer pane 3 and one on one in the upper area of door 9 arranged handle bar 6 attached door handle 5. The door handle 5 is bow-shaped (bow handle) and is preferably made of a metal such as stainless steel. The outer pane 3 has a central viewing window. 30 on and is around the viewing window 30, for example Printing opaque.

Above the viewing window 30, the outer pane 3 has one for example, a rectangular cutout in which a as a ventilation grille with several air outlet openings 63 and webs 61 formed therebetween 62 of a handle support bar 6 protrudes. The air outlet area 62 of the handle support bar 6 has a receiving groove 67 in which the outer pane 3 on her upper edge is included. In the handle support bar 6 is an air baffle 64 is provided which is essentially one horizontally impinging flow of through an inlet opening 68 cooling air entered on the handle support strip 6 K 'deflects obliquely downwards in a deflection direction. Also the door interior 91 of the door 9 from the cooling air K ' shielding air deflector 65 and the webs 61 are in this Direction of deflection directed so that the cooling air K ' the air outlet openings 63 at an angle emerges below the door handle 5 and thus does not hit the door handle 5. This angle becomes dependent on the relative arrangement of the air outlet openings 63 selected for the door handle 5 and can the smaller against the horizontal (normal direction to Front), the further down the air outlet openings 63 are offset against the door handle 5. in the generally the exit angle becomes horizontal between 0 ° (at least 2 cm lower than the door handle 5 arranged air outlet openings 63) and 80 °, preferably between 20 ° and 45 °. The air inlet opening 68, the flow guide 64 and 65, the Grid slats 61 and the air outlet openings 63 and the channel formed between them form an air duct area 66. Through the large air duct area 66, which covers at least the 0.7, preferably extends at least 0.8 times the front width of the door 9, become the front of door 9 in the upper area cooled over a large area and the outer pane 3 in between hotter viewing window area 30 and the door handle 5 lying Area cooled so that the temperatures at Door handle 5 are thereby lowered.

The door handle 5 has 52 at its angled ends and 53 each have a cylindrical extension through which the lateral regions 32 projecting upward from the cutout and 33 of the outer pane 3 passed through corresponding holes and is screwed to the rear of the handle support bar 6 are. The handle support bar 6 also serves as a support or Carrier for the upper regions 32 and 33 of the outer pane 3 and is slightly longer than the width of the outer pane Third

In addition to the outer pane 3, the door 9 also has an inner pane 2 on the rear side facing the loading opening the door 9 and one in the door interior 91 between the Inner disc 2 and the outer disc 3 arranged washer 4 on. The inner pane 2, washer 4 and Outer pane 3 are preferably parallel to each other and spaced from each other. This means that between the inner pane 2 and the washer 4 an inner Gap 24 and between the outer pane 3 and the An intermediate space 34 is formed between the intermediate disk 4. to The inner pane 2 can have better thermal insulation of the door 9 and / or the intermediate disc 4 with a heat radiation reflecting Layer, for example coated with a metal oxide be to the heat radiation in the muffle interior 19 to reflect back. The inner pane 2, washer 4 and the outer pane 3 generally consist of one clear glass or a glass ceramic, the Inner pane 2 is generally smaller than the outer pane 3 is formed.

For venting (avoiding condensation) and / or cooling of the door interior 91 is above the receiving groove 67 and an outlet opening below the air outlet area 62 40 provided. With appropriate design of the air outlet openings 63, the cooling air flow K 'can additionally Draw air out of the door interior 91 through the action of an injector.

In Figure 3 is a complete oven (stove), in particular a household oven, shown schematically with an oven muffle 10, a door 9 for closing a loading opening 16 of the furnace muffle 10 and a housing 83. Above the furnace muffle 10 is a cooling fan (cooling device) 23 arranged.

The door 9 is constructed differently in FIG the door according to FIGS. 1 and 2. The cooking oven according to FIG. 3 can but also equipped with a door according to FIGS 1 and 2 become. In an upper area, the door 9 now points in accordance with 3 shows a door handle 5 ', which is preferably on a made of a plastic, in particular a polymer plastic, formed handle support bar 6 'attached or is molded. Below the door 9 is a suction area 36 educated.

When the cooling fan 23 is switched on, 9 In the suction area 36, cooling air K is sucked in from the outside space 50. The suctioned cooling air K is through the between the housing 83 and the bottom 13 of the furnace muffle 10 formed Interspace 73 and then by the between the Muffle rear wall 14 and the rear wall of the housing 83 formed space 74 led upwards and through that Cooling fan 23 in a between air baffles 82 or the muffled ceiling 17 formed air duct 75 passed. After flowing through the air duct 75 Cooling air K through a formed in the handle support bar 6 ' Air duct 69, which is down from an air deflector 68 and is limited by an air baffle 67 ,. directed to an air outlet opening (blow-out area) 63 and there as warmed cooling air K 'back into the outside space 50 blown out.

The air guide 67 and the air deflector 68 are preferred also integrally formed on the handle support bar 6 '. It are now the air outlet opening 63 and the air guide 67 arranged and designed so that the cooling air K 'below the door handle 5 'flows out, so practical does not flow onto the door handle 5 '. This will the door handle 5 'is not comparatively hot Cooling air K 'warms up and remains sufficiently cool.

The cooling air K is guided around the entire furnace muffle 10 and thus ensures large cooling of the oven. A muffle wall 14 is generally not shown Muffle insulation laid, along which the cooling air K flows. In the muffle cover 17, a not shown Connection should be provided via the vapors from the Muffle interior 15 discharged into the air duct 75 and together with the cooling air from the blow-out area 37 is blown out. The vaping can also on another Point and not the cooling air K are supplied, for example in a built-in stove the associated built-in hob.

The air deflector 68 fluidically separates the air duct 69 and the air outlet opening 63 from the door interior 91. This air baffle 90 can in particular be an air baffle be tight against the inner pane 2. Between the air baffle 90 and the washer 4 a connection area 38 is formed over which the inner Gap 24 and the outer gap 34 of the door 9 are in flow communication so that forced convection through the door interior 91 for cooling the door 9.

In all embodiments, the door 9 can be hinged, in particular about a horizontal, pivotable axis Folding door or also an axial, in particular horizontal, sliding door (baking cart).

Claims (10)

1. Cooking oven door (9) for closing the loading aperture (16) of an oven muffle (10) of a cooking oven, having

   a) a front face remote from the oven muffle, a rear face associated with the oven muffle, and an upper face,

   b) a door handle (5) on the front face, preferably in its upper region,
   characterised by

   c) an air conducting region of the cooking oven door, which region has on the rear face and/or on the upper face at least one air inlet aperture, which region opens at the front face, preferably in its upper region, with at least one air outlet aperture into a surrounding room, and which region is so formed that air introduced to its at least one air inlet aperture is conducted under the door handle (5) and past the door handle (5) into the surrounding room, wherein

   d) in a handle support strip (6) an air conducting body (64) is provided, which deflects a flow with substantially horizontal impact obliquely downwards in a deflection direction in which an air baffle (65) screening the door interior (91 ) from the cooling air (K') is also oriented, and/or

   e) each air outlet aperture is offset downwards relative to the door handle.
2. Cooking oven door according to claim 1, in which at least one air outlet aperture of the air conducting region is disposed at least partly behind the door handle at the same height and the air outlet region is so arranged that the air at least from this air outlet aperture is passed out obliquely downwards past the door handle.
3. Cooking oven door according to one of the preceding claims, in which plural air outlet apertures (63) are arranged in an aeration grid.
4. Cooking oven door according to one of the preceding claims, having an outer panel (3) on the front face which is optically transparent at least in part.
5. Cooking oven door according to claim 4, wherein the outer panel has a cut-out (31) in which the at least one air outlet aperture (62) is disposed and the door handle (5) is passed through regions (32, 33) of the outer panel (3) which project upwards laterally from the cut-out (31).
6. Cooking oven door according to one of the preceding claims, wherein the at least one air outlet aperture (62) and/or the door handle extends over at least 70%, preferably at least 80%, of the width of the front face.
7. Cooking oven door according to one of the preceding claims, wherein the door handle (5) is bow-shaped and consists at least for the most part of metal, in particular high-grade steel.
8. Cooking oven door according to one of the preceding claims, wherein the door handle (5) is fixed to a handle support strip (6) preferably consisting of a plastics material or is connected integrally to the handle support strip.
9. Cooking oven, having

   a) an oven muffle (10) for heating food which may be inserted via a loading aperture (16) into a muffle interior (15),

   b) a door (9) according to one of the preceding claims for closing the loading aperture (16) of the oven muffle (10), and

   c) a cooling device, which draws cooling air from a surrounding room, passes the air at least around part of the oven muffle, and blows the air back out into the surrounding room through the air conducting region.
10. Cooking oven according to claim 10, having a pyrolytic self-cleaning function.

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