EP1120607B1 - Device for a heating oven provided with a door - Google Patents

Abstract

A kitchen oven (1) has a front-mounted outwards-opening hatch (8). The oven chamber interior has switch (18) operated extractor fan (5,5a) outlets (9,10). The switch and hatch are coupled such that the extractor fan operates for at least a brief period before the hatch is opened, and while the hatch is open, minimizing the escape of hot air and cooking emissions. The oven interior has preferred a number of interior exhaustion outlets for hot air and vapors, including at least one in the immediate vicinity of the hatch. The switch (18) also regulates the suction power. During operation of the oven, the extractor in the immediate vicinity of the hatch rear face is in constant operation (5a).

Description

The invention relates to a device for a heating furnace provided with an oven door - in particular for an oven, in the furnace chamber during heating operations, such as frying operations, hot air, especially vapors forms - for a suction of the hot air by means of a suction device Suction opening is provided.

From EP 0 290 925 A3 it is known to suck the hot air forming on heating from a baking or roasting oven permanently backwards. Furthermore, it is known from DE 83 08 713.3 U to dissipate the hot air or the vapors upwards. The hot air or the vapors flow in this case above the oven door from the front. Because of the relatively high temperatures of these vapors, the operator is at significant risk when operating the oven door or control knobs for the oven and hobs.

From DE 39 31 482 a baking oven with a Wrasenöffnung is known, which is automatically switched off only during high frequency operation. The suction opening is closed during normal operation.

The above solutions are limited to the discharge of vapors during operation, but do not sufficiently ensure the escape of a surge of hot vapors when opening the oven door, if in the oven already roasting Good is treated.

An alternative solution is disclosed in EP-A-0 962 708. There is a canned open with releasable by opening the open door outlet openings through which set by means of a fan and by a door opening switch in motion a cooling air flow escapes, which is directed against the ascending from the open air space hot air. Although the solution may mitigate the upward heat effect on the operator, but can not sufficiently prevent the odor nuisance associated with the outflow of open-air interior air.

It is an object of the invention to provide a device of the type mentioned, in which the escape of the surge of hot air or hot vapors when opening the oven door is prevented if necessary or reduced as much as possible.

• die Absaugeinrichtung (5,5a) mittels eines Schalters (18) gesteuert zumindest teilweise vor dem Öffnen der Ofentür (8) oder sogar ausschließlich vor dem Öffnen der Ofentür mit einer kurzeitig die heiße Luft aus dem Offeninnenraum entfernenden Absaugintensität betrieben wird, oder der Schalter (18) die Absaugwirkung einer ständig in. Betrieb befindlichen Absaugvorrichtung (5) verstärkt, wobei die Absaugeinrichtung (5,5a) so ausgelegt ist, dass durch das zumindest teilweise vor dem Öffnen der Ofentür (8) bewirkte Absaugen das Austreten heißer Luft bzw. Wrasens aus dem Türöffnungsspalt (14a) vermindert wird,
• der Schalter (18) ein Ein- und Ausschalter der Absaugeinrichtung ist oder die Absaugwirkung auch hinsichtlich der Intensität variiert und der Schalter (18) ggf. weiterhin an eine Logik gekoppelt ist, die ein zeitlich verzögertes Deaktivieren der Absaugvorrichtung oder eine Verringerung der Absaugwirkung auslöst, und
• die abgesaugte heiße Luft durch ein Leerrohr (4) direkt nach Außen, durch das Leerrohr (4) über den Wrasenabzug nach Außen oder über eine Filtervorrichtung in das Leerrohr (4) nach Außen geführt wird.

The object is achieved according to the invention, by a device for an oven door provided with a heating furnace - such as a baking oven, which may also be designed as a hot air oven - in the oven interior in heating processes hot air, especially vapors forms, the suction by means of a or a plurality of suction openings and a suction device, and the suction openings are arranged even when the oven door is closed inside the heating furnace in the oven interior, wherein

• the suction device (5, 5a) is operated by means of a switch (18) controlled at least partially before opening the oven door (8) or even exclusively before opening the oven door with a suction time removing the hot air from the open interior, or the switch ( 18) amplifies the suction effect of a suction device (5) which is constantly in operation, wherein the suction device (5, 5a) is designed so that hot air or vapor escaping through the suction caused at least in part before opening the oven door (8) is reduced from the door opening gap (14a),
• the switch (18) is an on-off switch of the suction device or the suction effect also varies with respect to the intensity and the switch (18) is optionally further coupled to a logic which triggers a delayed deactivation of the suction device or a reduction of the suction effect, and
• the extracted hot air through an empty tube (4) directly to the outside, through the empty tube (4) via the vapor outlet to the outside or via a filter device in the empty tube (4) is led to the outside.

Each operator knows the phenomenon that the hot air rises in the face, e.g. the glasses are fogged; one inevitably deviates from the hot torrent. A targeted suction before and possibly even at the moment of opening the door prevents these annoying processes or makes them at least erträglicner.

There is also the fact that the fumes in the kitchen rise to the top and dirty the walls, especially the kitchen ceiling, sustainable. This disadvantage is eliminated when using the device according to the invention or at least mitigated,

According to a preferred embodiment of the invention it is provided that one or more suction openings open in the vicinity of the door opening gap in the furnace chamber.

The suction device may additionally be designed as a door air extraction system which is effective when the door is open at least partially, the door air suction device being designed and the suction openings being arranged in the heating furnace such that the hot air in the heating furnace opens when the oven door opens, forming an opening gap Door air extraction from the opening gap is kept as far away as possible, so as not to escape from the opening gap.

The switch can not only act as an on and / or off switch of the suction device or with respect to the throttle valve, but also be designed so that it also varies the suction effect in terms of intensity. The suction device according to the invention is controlled by the switch and operated exclusively before opening the oven door with a short time the hot air / the vapors from the open space removing Absaugintensität. The switch is preferably located at the front of the heating furnace and is also preferably manually switched by the operator.

Preferably, the switch is further coupled to a logic that triggers a time-delayed deactivation of the suction device or a closing of the throttle valve or even a reduction of the suction effect. The logic can only consist in a delay of deactivation by a constant time, namely in a sufficient suction of the Wrasens or the hot air is ensured to allow opening of the oven door without annoyance by outflowing furnace internal air or even to a temperature sensor and the fall below a temperature limit to be coupled.

Furthermore, it is possible that time and / or temperature controlled first suction of the furnace internal air is effected and subsequently optionally under reduced suction and coupled to the opening of the door, a door air extraction is additionally activated. Furthermore, after activating the suction device, the operator can also be displayed in a time-controlled and / or temperature-controlled manner when the oven door is to be opened.

The Türluftabsaugvorrichtung may have a control device with the opening of the oven door, the door air extraction is switched on or changed in Absaugwirkung, the Türluftabsaugung is switched by a additionally opening when the door door Türluftabsaugschalter or effected by time-delayed switching of the switch of the suction device become.

According to a further embodiment of the invention, it is provided that one or more suction openings of the door air extraction in the vicinity of the door opening gap open into the furnace chamber. Thus, the hot air in the region of the opening forming opening can be detected improved.

Furthermore, by closing the oven door possibly a control pulse can be triggered, which deactivates the suction device including the Türluftabsaugung or back to normal operation.

As far as a continuously operating during operation of the furnace suction device is present, the hot air can be introduced from the furnace door in the suction of the suction by a device in Türluftabsaugluftrohr between the suction at the opening gap of the furnace chamber and the junction of this tube into the tube of the suction device , such as a throttle valve, which releases the Türluftabsaugluftrohr by the action of the switch and / or by opening the oven door completely or partially, wherein in Türluftabsaugluftrohr an additional Türluftabsaugvorrichtung may be provided. The additional front door air extraction is preferably only active when opening the oven door.

The suction effect of the door air extraction can e.g. be adjustable by a throttle. Furthermore, suction openings connected to suction channels in the oven door can be provided, via which hot air can be sucked away from the opening gap. By the above measures, an air curtain can be formed at the opening region of the furnace chamber, which prevents the escape of hot air from the furnace chamber as much as possible. The Türluftabsaugung is preferably effective only when opening or just before opening.

Of course, it must be ensured that delicate dough is not damaged by the sudden onset of suction. So cake, when it undergoes a sudden cooling by the increasingly onset suction, coincide. According to a further embodiment of the invention it is therefore provided that the suction effect on a control unit, e.g. a control switch, is adjustable. The effect of the suction device including the door air extraction can be varied manually and electronically controlled and possibly reset to zero.

According to a further embodiment of the invention it is provided that the position of the throttle valve (s) is adjustable by means of Türluftabsaugschalters.

According to a further embodiment of the invention, it is provided that in the opening region of the furnace chamber, ie on the side facing the opening, a planar air curtain is formed, which prevents the escape of hot air from the furnace space as much as possible.

If there is no empty pipe for the discharge of hot vapors to the outside or in the possibly located above the stove fume hood or a filter device available, then brings the heat of the extracted air and its pollution, for example, by fat, problems.

According to a further embodiment of the invention it is therefore provided that the hot air is first cleaned from the oven before draining from the heating furnace in a filter and then optionally additionally cooled in a cooler. The filter may be, for example, a stainless steel filter. The cooler may be a liquid bath, in particular a water bath. Filter and the cooler can be advantageously arranged below the oven.

According to a further embodiment of the invention it is provided that the filter and the radiator are a treatment unit, which are interchangeable by a front, closed with a flap opening.

Likewise, the suction device can be used expediently for removing the gases which form during the pyrolytic cleaning of the furnace interior.

• Fig. 1 eine Seitenansicht einer Küchenzeile mit einem teilweise aufgeschnitten dargestellten Küchenherd, wobei ein Wrasenabzug in der hinter der Küchenzeile befindlichen Wand verläuft,
• Fig. 2 den Aufbau nach Fig. 1, wobei wegen eines fehlenden Wrasenabzugschachtes der Wrasenabzugskanal vor oder an der Küchenwand verläuft,
• Fig. 3 den Küchenherd nach Fig. 1 mit einer teilweise geöffneten Ofentür,
• Fig. 4 einen Ausschnitt aus dem unteren vorderen Bereich des Küchenherdes zur Darstellung der über die Ofentür geleiteten Absaugung,
• Fig. 5 eine Darstellung eines Luftvorhanges im Bereich der Of enöf fnung ,
• Fig. 6 eine andere Art der Wrasenentsorgung für die Fälle, in denen zum Abziehen des Wrasens kein Hohlrohr in der Küchenwand zur Verfügung steht.

The invention will be explained in more detail with reference to the drawing. Show it:

• 1 is a side view of a kitchenette with a partially cut shown cooking range, with a Wrasenabzug runs in the wall behind the kitchen,
• 2, the structure of FIG. 1, wherein runs because of a lack Wrasenabzugschachtes the Wrasenabzugskanal before or on the kitchen wall,
• 3 shows the kitchen stove according to FIG. 1 with a partially opened oven door, FIG.
• 4 shows a detail of the lower front region of the cooker to illustrate the guided over the oven door suction,
• 5 shows a representation of an air curtain in the region of the opening opening,
• Fig. 6 shows another type of Wrasenentsorgung for the cases in which there is no hollow tube in the kitchen wall for removing the Wrasens available.

In Fig. 1, a part of a fitted kitchen is shown. This part of the fitted kitchen consists of a kitchen stove (1), a fume hood (2) for kitchen fumes above the cooker, both of which are arranged on a kitchen wall (3). This arrangement is to be regarded as exemplary. Kitchen stove (1) and fume hood (2) for the kitchen fumes can also be arranged in the middle of a kitchen, as it is seen in large enough kitchens and commercial kitchens, because the stove can then be served from all sides. The vapor outlet then runs upwards as an exposed tube.

The exhaust pipe (4) of the fume hood (5) from the kitchen stove (1) extends in the kitchen wall (3) in a duct, not shown.

Fig. 2 shows a variant of the leadership of the exhaust pipe (4) as a flat tube before or directly on the kitchen wall (3).

The kitchen stove (1) is shown in Figs. 1 and 3 cut open, so that the oven (6), as a furnace muffle or oven known, appears on average. The oven chamber (7) is provided with an oven door (8). In Fig. 1, the oven door (8) is shown in the closed and in Fig. 3 in the open position.

There are exhaust ports (9) and (10) are provided, are connected to the exhaust air pipes (11) and (12). A discharge opening (9) is located in the rear area (13), one or more further discharge openings (10) above and laterally in the front region (14) of the oven wall (15) in the vicinity of the opening gap (14a), which forms when an operator begins to open the oven door (8). The number of provided vent openings (10) in the front region (14) depends on the needs of the respective oven (7). The embodiment is just to be considered as clearly exemplifying this point.

A cooking fume hood (5) belonging to the cooking appliance and serving as a suction device has an exhaust fan, not shown, which sucks the hot air, the vapors, via the exhaust air pipe (11). Therefore, in order to restrict the suction during operation of the suction device by operating the switch (18) on the rear oven area (13), in the heating mode, the exhaust air pipe (12) by means of a throttle valve (16) is closed, which only when opening the oven door ( 8) opens. The opening of the throttle valve (16) is a switch (17). In the exhaust air pipe (12) is still another acting as a take-off device Wrasenabzug (5 a), which together with the throttle valve (16) can be switched on. In order to improve the effect of the suction at the moment of opening the oven door (8), a time advance can be set. Also, the suction power can be increased at this moment. The oven door can then only open when an effective extraction through the opening (9) and possibly the door suction on the pipe (12) in addition has been activated. For this purpose, a mechanical lock can be provided which blocks door opening for a few seconds. Both vapor exhausts (5) and (5a) act in the illustrated embodiment at the moment of door opening together as Türluftabsaugeinrichtungen and are adjusted for this purpose also together in the suction so that at all suction openings of the embodiments sufficient suction is available to the vapors or the hot air at the opening gap (14a) not to leave or as little as possible. By the switch (18) is usually set the highest suction. In order not to damage the baking of sensitive goods, such as cakes, it is intended to set the output of the fume hood (5), or both fume hoods (5) and (5a) for the period of the oven door opening as desired. For this purpose, the switch (18) is provided as controllable, with which the suction power can be reset by hand to zero.

There are various operating variants possible here. Examples include:

The Wrasenabzug (5) is constantly under operation with lower suction, the actually pulse-like suction of Wrasens from the open interior by activating the switch (18) before opening the oven door (8) is effected and the front suction with the fume hood (5a) only when opening the oven door is put into operation.

The Wrasenabzug (5a) falls away and the suction of Wrasens is effected after activation of the switch (18) solely by the vapor outlet (5).

Fig. 3 shows the suction effect in the front region (14) of the oven (6). It can be seen that the above a roast (19), such as a goose, forming vapors when opening the oven door (8) from the thereby forming opening gap (14a) in the exhaust pipes (11) and (12) is sucked and so does not escape to the outside. The movement of the Wrasenströme is indicated by the arrows (20) and (29).

4 and 5 show the mode of action of variants which further improve the effect of the suction. In the oven door (8), one or more suction channels (21) are provided, which terminate at suction openings (23) which are open to the oven chamber (7). It can be seen from the movement arrows (24) how the hot air is torn away from the opening gap (14a). A further improvement is achieved if further suction openings (25) and (26) are provided which are connected to the suction channel (s) ) are connected.

It is also conceivable and shown in Fig. 5, to form an air curtain (27). The air would then flow in the front upper region (14), for example, from nozzles (28) down. The vapor is led backwards in the direction of the arrows (29). Through suction openings (30), the air of the air curtain (27) through the connecting channel (31) for vapor withdrawal (5) is passed. The direction of flow of the air curtain (27) can of course also run inversely from bottom to top.

In Fig. 6, a treatment of Wrasens is shown for the case in which the vapor is not to be dissipated hot and as little as possible dirt. In the opening area (14) of the oven (6), near the opening gap (14a), the hot, indicated by the arrows (20) air is sucked through the suction openings (10) in the suction air pipe (12) when opening the oven door (8) , A suction device (5a) enhances the suction effect, previously a further part of the hot air has been sucked down through the suction opening (9) and a suction pipe (33), where the suction pipe (33) is sucked out (12) opens. The hot air flows in the suction pipe (33) finally united in a filter (34). The filter (34) may be a stainless steel filter and the cooler (35) a water bath. Preferably, the filter (34) and the cooler (3) are arranged below the heating furnace (6).

Below this filter (34) is a water basin (35), in which the air in the filter (34) flows in and cools. The vapor outlet (5) sucks the now cleaned and cooled air into the flue pipe (4), which leads directly to the outside or into the vapor outlet (2) for the kitchen fumes.

The filter (34) and serving as a cooler (35) water basin are summarized as a treatment unit (36) which is arranged behind a flap (37).

Claims (9)

1. Device for a heating oven (1) provided with an oven door (8) and in whose interior (7) hot air, in particular vapours, is formed during heating processes, which oven exhibits exhaustion by means of one or more exhaust openings (9, 10) and an exhaust device, wherein the exhaust openings (9, 10) are arranged inside the heating oven (1) even when the oven door (8) is closed,
   characterised in that

   - the exhaust device (5, 5a) is controlled by means of a switch (18) and is operated at least partially before the oven door (8) is opened, or even exclusively before the oven doors is opened, with an exhaustion intensity that removes the hot air from the oven interior for a short time, or in that the switch (18) increases the exhaustion intensity of a continuously operating exhaustion device (5), wherein the exhaustion device (5, 5a) is designed so that the quantity of hot air or vapours is reduced escaping from the door opening gap (14a) by the exhaustion that takes place at least partially before the oven door (8) is opened,

   - the switch (18) is an on and off switch for the exhaustion device, or varies the exhaustion effect also in terms of the intensity, and the switch (18) optional may also be connected to a logic which triggers time-delayed deactivation of the exhaustion device or a reduction of the exhaustion effect, and

   - the exhausted hot air is guided through a duct (4) directly to the outside, through the duct (4) via the vapours extractor to the outside, or through a filter device into the duct (4), to the outside.
2. Device according to Claim 1, characterised in that one or more exhaustion openings (10) open into the hearth (7) close to the door opening gap (14a).
3. Device according to one or more of Claims 1 or 2, characterised in that in the presence of an exhaustion device (5) that is continuously in operation whilst the oven is operating, the hot air is introduced from the oven door (7) into the exhaustion air of the exhaustion device , whereby a device, such as a throttle valve (16), is provided in the door air exhaustion pipe (12) between the exhaustion openings (10) on the opening gap (14a) of the hearth (7) and the opening of this pipe (12) into the pipe (4) of the exhaustion device, which device wholly or partially releases the door air exhaustion air pipe (12) by the action of switch (18) and/or by opening the oven door (7), whereby an additional door air exhaustion device (5a) can be provided in the door air exhaustion air pipe (12).
4. Device according to one or more of Claims 1 to 3, characterised in that the suction effect of the door air exhaustion can be adjusted by a throttle valve (16).
5. Device according to one or more of Claims 1 to 4, characterised in that exhaustion openings (23, 25) connected to exhaustion ducts (21) are provided in the oven door (8), through which openings the hot air can be exhausted from the opening gap (14a).
6. Device according to one or more of Claims 1 to 5, characterised in that an air curtain (27) is formed in the opening region (14) of the hearth (7), which curtain prevents as far as possible the escape of the hot air from the hearth (7).
7. Device according to one or more of Claims 1 to 6, characterised in that the hot air / vapours from the hearth (7) is first cleaned in a filter (34), before being discharged from the heating oven (1), then cooled in a cooler (35).
8. Device according to Claim 7, characterised in that the filter (34) and cooler (35) constitute a treatment unit (36) which can be replaced by a front opening closed with a flap (37).
9. Device according to one or more of Claims I to 8, characterised in that the logic consists in delaying the deactivation of the exhaustion device by a constant time, or is controlled by a temperature sensor and the fall below a temperature limit value.

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