EP2149757A2 - Cooking apparatus with a fluid conducting element - Google Patents

Abstract

Fluid-guiding device comprises a flat channel (10) having a larger maximum width (B) than the maximum height (H) and an opening in the form of a longitudinal hole (12) with a larger maximum width (b) than the maximum length (l). The maximum width of the longitudinal hole is aligned with the maximum width of the flat channel. An independent claim is also included for a cooking device with the above fluid-guiding device. Preferred Features: The longitudinal cross-sectional surface of the longitudinal hole is at least 100% of the cross-sectional surface of the flat channel. The maximum width of the flat channel is at least 1.5 times larger than the maximum height of the flat channel.

Description

The invention relates to a cooking appliance with an interior, comprising at least one cooking chamber and a fluid guide device with at least one channel in the form of a flat channel, which is connectable or connected via at least one opening with an interior of the cooking appliance and in cross-section a larger maximum width B than maximum height H, wherein the opening in the form of a slot in longitudinal section has a greater maximum width b than maximum length 1, and the maximum width b of the slot is aligned with the maximum width B of the cross section of the flat channel.

Cooking devices with channels for removing atmosphere from the respective cooking chamber are well known in the art. It is usually the task of the respective channel during cooking in a substantially closed cooking chamber occurring to remove vapors from the oven.

For example, from the DE 10 2006 031 581 A1 a device for heat treatment of food is known in which a heatable cooking chamber via a first opening in a side wall with an exhaust duct is connectable. In addition, a floor drain in the cooking chamber floor via a second opening and a bypass line is connected to the exhaust duct. Gases exiting through the two openings can thus be removed from the cooking chamber and released to the ambient atmosphere. The disadvantage here, however, that two ports and channels are provided to effectively dissipate both liquid and gases from the oven.

The WO 2006/056305 A1 discloses an oven with a steam channel through which fumes generated during a baking or frying process in a baking muffle are discharged to the environment. The derived vapors are used at the same time, by a measurement of the gas composition of the vapors to obtain conclusions about the state of the cooking chamber atmosphere.

From the GB 2 305 237 A a convection oven is known, which comprises an outlet for the discharge of combustion gases and vapors which arise in the cooking chamber, wherein the outlet opens in the ceiling of the cooking chamber to the cooking chamber.

Furthermore, the disclosure US 4,796,000 a gas wall oven. It is proposed that combustion gases of a gas burner routed through a cooking chamber are removed via outlet openings arranged over a ceiling region of the cooking chamber. Due to the arrangement of the burner in the bottom region of the cooking chamber allows this oven to run at the bottom of the cooking chamber to collect liquid defined.

Furthermore, the teaches US 2,622,583 a ventilation and cooling device for cooking appliances. It is proposed that the cooking chamber atmosphere is discharged through an opening arranged in the ceiling region of a cooking chamber, thereby sucking in cool ambient air and guiding it for cooling over a surface of the cooking chamber.

The EP 1 855 058 A1 and EP 1 712 845 each reveal another cooking appliance, in which a Wrasenauslass is arranged on the ceiling of the cooking chamber. The Wrasenauslass is automatically closed by a flap, so that depending on the measurement of a temperature sensor, in particular in combination with a measurement of a humidity sensor, the flap is opened and vapor is discharged from the cooking chamber to the ambient atmosphere.

The EP 1 790 913 A2 discloses a generic cooking appliance with a steam generator. Steam generated in the steam generator is fed to a cooking chamber via a flat channel. A drain of itself at the bottom of the cooking chamber collecting liquid is not possible with this cooking appliance.

Another controllable via a flap Wrasenableitung is from the EP 1 715 253 A2 known, which has an opening at the rear wall of a cooking chamber.

To reduce the external dimensions of cooking appliances and thus save space, there is a fundamental desire to compress the technical structure inside a cooking appliance. At the same time but should receive the full functionality of the cooking appliance stay. The object of the invention is therefore to further develop a generic fluid guiding device such that the known from the prior art Gargerätebemessung is reduced without affecting the functionality of the cooking appliance, in particular the number of channels and the volume of these occupied volume within the cooking appliance is reduced.

This object is achieved in that the cooking appliance is characterized by a first flat channel for discharging Garraumatmosphäre from the cooking chamber and for discharging liquid from the cooking chamber with a first slot in a first interior wall, which constitutes a floor.

The cooking appliance can also be characterized by a second flat channel for supplying at least one gas and / or air to the cooking chamber with a second slot in a second interior wall, and / or a third flat channel for applying at least one sensor with cooking chamber atmosphere with a third slot in a third interior wall, wherein preferably the first and / or second flat channel, and / or the first and / or second slot, and / or the first and / or second interior wall are each formed in one.

It can be provided that the first and / or second interior wall is a floor, and / or the third interior wall is a side wall or a ceiling, wherein preferably the interior of the cooking chamber and one of the same via at least one Fluidleiteinrichtung separated fan chamber and the bottom the cooking chamber floor and / or the side wall is the cooking space side wall and / or the ceiling is the cooking space ceiling.

It is also proposed that the first and / or second flat channel is connected to the ambient atmosphere of the cooking appliance, preferably lockable via at least one first shut-off device, and / or the first flat channel can be closed off with a condenser or extinguishing box of the cooking appliance, preferably via a second shut-off device , is in communication, and / or the first flat channel with a domestic water network, preferably lockable via a third shut-off device, is in communication.

It can also be provided in the latter embodiment that the first, second and / or third shut-off device is or are connected to a control or regulating device of the cooking appliance.

Furthermore, a cooking appliance according to the invention may be characterized in that the cooking appliance is a combi steamer. It is preferred that the longitudinal sectional area of the first, second and / or third slot is at least 50%, preferably at least 100%, of the cross-sectional area of the first, second and / or third flat channel.

Finally, it is proposed with the invention that the cross-sectional area of the first, second and / or third flat channel and / or the longitudinal sectional area of the first, second and / or third oblong hole has the shape of an oval or a rectangle, in particular with rounded corners.

The surprising finding of the invention is that the outer dimensions of a cooking appliance can be reduced by the flattening of a channel, in particular for dissipating cooking space and the flow resistance is not changed by adapting the shape of the opening of the channel to the cross section of the channel, respectively Compared to a conventional channel, circular in cross-section or square velvet circular opening in the cooking chamber. In particular, these measures make it possible for one and the same channel to be used both for removing the cooking chamber atmosphere and for liquid from the cooking chamber without resulting in functional losses. As a result of the possible reduction of at least one discharge channel in comparison to the prior art, an enormous reduction of the installation space volume required for the waste and supply line technology is achieved. In particular, in the case of a geometry according to the invention at the same pressure in the cooking chamber prior to the opening, the same volume flow through the channel can be achieved, as is the case with conventional circular geometry of the opening and of circular or square geometry of the cross-sectional area of the channel. On the other hand, if one were to use a circular opening over a flattened channel, the back pressures occurring at the transition from the opening to the channel would increase the flow resistance of the overall system compared to a circular symmetry of the opening and the cross-sectional area of the channel. This would indeed achieve a reduction in the outer dimensions of the cooking appliance, but with a reduction in the volume flow out of the duct, so that vapors could be more difficult to run out of the cooking chamber through the duct. This would lead to prolonged dehumidification times, which may adversely affect the cooking result. Therefore, in the prior art only additional discharge channels for the removal of vapors in addition to channels for the removal of liquid, which open into a cooking chamber in the bottom area, were used. Only the combination of a Slotted hole and a flat channel enables the functional combination of a Flüssigkeitsabführkanals and a Wrasenkanals without functional loss.

When using a shallow channel in combination with a circular opening, which leads into the channel, namely only a small part of the area of the opening is used as an effective flow cross-section. Due to the back pressures that occur in the channel in the region of the opening, namely can take place by a large part of the opening no effective flow into the channel. A small channel height thus leads, so to speak, to a "constriction" of the flow during the deflection from the cooking chamber into the channel. This "constriction" is inventively compensated by the fact that the cross-sectional area of the flat channel in the shape of the opening from the cooking chamber to the channel, namely a slot, reflects. As a result, the effective flow cross-section is increased and the pressure loss is reduced. By using a long drawn shape for the opening, which is also referred to as a slot, so an optimal geometry with respect to the flow characteristics in the channel is possible.

If you were to use a very large circular opening to ensure a large volume flow through the channel, so a large expander would be required, which in turn is costly.

Figur 1

eine kreisrunde Öffnung und ein Langloch im Längsschnitt; und

Figur 2

einen perspektivisch dargestellten rechteckigen Flachkanal mit einem Langloch gemäß der Erfindung.

Further features and advantages of the invention will become apparent from the following description of an embodiment of the invention with reference to two schematic drawings. Showing:

FIG. 1

a circular opening and a slot in longitudinal section; and

FIG. 2

a perspective rectangular flat channel with a slot according to the invention shown in perspective.

FIG. 1 shows a circular opening 1, which leads to a channel (not shown) of the width B. This channel is therefore a flat channel in the sense of the invention.

Due to the fact that when using a very shallow channel, a large part of the longitudinal hole section is not used as an effective flow area, the area of the circular opening 1 is effective for the flow of fumes from the cooking chamber (not shown). contributes to the channel, greatly reduced. The effective flow area 2 of the circular opening 1 is in FIG. 1 shown as pie-shaped segment of the circular opening 1. As in FIG. 1 can be seen, so contributes to a combination of a circular opening with a compartment channel to which the opening 1 leads, only about a third of the surface of the circular opening 1 as an effective flow area 2 for transporting gases from the cooking chamber in the channel. This makes the opening 1 unsuitable, in addition to an outflow of liquid also efficiently allow the function of a withdrawal of vapor. The invention is based precisely on this knowledge about the reduced flow area 2.

Based on this finding, according to the invention, the area of the opening in the area of the effective flow area 2 is increased to a slot 4, so adapted to the shape of the opening to the effective flow area to allow efficient withdrawal of vapor and at the same time a comparable opening area for the process to provide fluid. The slot 4 is at most as wide as the underlying channel with the width B. The use of an opening with a larger area than that of the optimal slot 4 offers, in particular with regard to the withdrawal of vapors, no advantages, while smaller openings to reduce the Volumetric flow, in particular of liquid, lead through the channel.

The surface of the slot 4 is dimensioned so that it corresponds to the surface of the circular opening 1, so that through the slot 4 in about the same amount of gas can flow, as when using a circular cross-section channel with the circular opening 1, wherein the Channel cross section corresponds to the opening area. Since the slot 4 is also used at the same time for discharging liquids from the oven, it is ensured by the same area that even similar amounts of liquid from the oven can be removed, as in the circular opening. 1

By using an approximately rectangular slot 4 as an opening to the channel, the right part of the circular opening 1, which does not effectively contribute to the flow of gases from the cooking chamber into the channel or vice versa, saved. Alternatively to in FIG. 1 illustrated rectangular shape of the slot 4 can also be an oval slot or a slot with two sides in the form of semicircles or other geometry can be used.

FIG. 2 shows a perspective view of a flat channel 10 according to the invention with a slot 12, the flat channel 10 with a cooking chamber (not shown) of a cooking appliance combines. The slot 12 is disposed in the bottom of the cooking chamber and can serve as a drain for liquids from the oven at the same time. The flat channel 10 begins at the slot 12 and is in operative connection with a gas outlet (not shown). Between the gas outlet and the slot 12, a quenching device (not shown) may be located, are condensed with the hot vapor from the cooking chamber and cooled before being discharged via an outlet, not shown, to the ambient atmosphere. Since the flat channel 10 is also used for discharging liquids from the cooking chamber, this is connected to an outlet (not shown). The spout is liquids, which are passed from the cooking chamber through the slot 12 and the flat channel 10, to a sewer system.

Not only by the saving of a separate channel for the withdrawal of vapors in addition to a drain of liquid, but also by the use of the flat channel 10 with a cross section in which the height H is significantly smaller than the width B, the entire cooking appliance can be made compact so that the outer dimensions of the cooking appliance are smaller than in a conventional cooking appliance. At the same time, the geometry of the elongated hole 12 ensures that gases with the same volume flow can be removed from the cooking chamber of the cooking appliance, as is possible when using a round tube with a circular opening 1. The geometry of the slot 12 is chosen so that the length 1 is significantly less than the width b in the longitudinal section, the width b is aligned with the width B of the flat channel 10 and parallel thereto.

The combination of the flat channel 10 and the slot 4, 12 is preferably used in combi steamers, with which food to be cooked with hot air and / or steam can be acted upon. Such cooking appliances, which are mainly used in large and commercial kitchens, rely on the fact that the cooking chamber atmosphere can be changed quickly and effectively. For this it is necessary that the cooking chamber atmosphere can be exchanged quickly. If this gas-conducting flat channels 10 are used to save space in the cooking appliance, these can be connected according to the invention with slots 12 to the cooking chamber to allow effective gas exchange of the cooking chamber with the ambient atmosphere of the cooking appliance.

For example, if a drainage channel is formed in a combi steamer with a plurality of insertion levels in a cooking chamber in the form of the flat channel 10, it is possible to reduce the overall device height. This, in turn, allows the shelf levels lower than when using a higher drainage channel can be arranged. Lower insert level heights are advantageous because when removing a container from a high rack level there is a risk of tilting of the container and thus the injury of a user by overflowing hot liquids from the container. A low device height thus also serves the operational safety of a cooking appliance, in addition to saving space in a kitchen. In addition, even with the use of flat channels a rapid gas exchange, the z. B. for the dehumidification performance of the cooking appliance, which indicates how fast the moisture in the oven can be reduced is essential, guaranteed by slots. If, for example, moist cooking chamber atmosphere is removed from the cooking chamber via a first flat channel with slot and dry air from the environment of the cooking appliance introduced into the cooking chamber via a second flat channel with slot, a satisfactory dehumidification performance while saving space and injury risk reduction is given.

Also, flat channels 10 with slots 4, 12 can be used to supply gases from the cooking chamber at least one sensor with which the state of the cooking chamber atmosphere is determined.

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential both individually and in any combination for the realization of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

1

circular opening

2

effective flow area

4

Long hole

10

flat duct

12

Long hole

B, b

width

H

height

1

length

Claims (9)

Cooking appliance having an interior, comprising at least one cooking chamber and a fluid guide device with at least one channel (10) in the form of a flat channel (10) which is connectable or connected via at least one opening (4, 12) with an interior of the cooking appliance and in cross-section greater maximum width B than maximum height H, wherein the opening in the form of a slot (4, 12) in longitudinal section has a greater maximum width b than maximum length 1, and the maximum width b of the slot (4, 12) to the maximum width B of the cross section of the flat channel (10) is aligned, characterized by
a first flat channel for removing Garraumatmosphäre from the cooking chamber and for discharging liquid from the cooking chamber with a first slot in a first interior wall, which forms a floor. Cooking appliance according to claim 1, characterized by
a second flat channel for supplying at least one gas and / or air to the cooking chamber with a second slot in a second interior wall, and / or a third flat channel for applying at least one sensor with cooking chamber atmosphere with a third slot in a third interior wall, preferably the first and / or second flat channel, and / or the first and / or second slot, and / or the first and / or second interior wall are each formed in one. Cooking appliance according to claim 1 or 2, characterized in that
the first and / or second interior wall constitutes a floor, and / or the third interior wall represents a side wall or a ceiling, wherein
Preferably, the interior of the cooking chamber and one of the same via at least one Fluidleiteinrichtung separated fan chamber and the bottom of the cooking chamber and / or the side wall, the cooking chamber side wall and / or the ceiling is the cooking chamber. Cooking appliance according to one of the preceding claims, characterized in that the first and / or second flat channel (10) with the ambient atmosphere of the cooking appliance, preferably via at least a first shut-off lockable, in conjunction stands, and / or
the first flat channel with a condenser or Auslöschkasten of the cooking appliance, preferably lockable via a second shut-off, is in communication, and / or the first flat channel with a domestic water network, preferably via a third shut-off device, lockable in communication. Cooking appliance according to claim 4, characterized in that
the first, second and / or third shut-off device is / are connected to a control or regulating device of the cooking appliance. Cooking appliance according to one of the preceding claims, characterized in that the cooking appliance is a combi steamer. Cooking appliance according to one of the preceding claims, characterized in that
the longitudinal sectional area of the first, second and / or third oblong hole (4, 12) is at least 50%, preferably at least 100%, of the cross-sectional area of the first, second and / or third flat channel (10). Cooking appliance according to one of the preceding claims, characterized in that
the maximum width B of the first, second and / or third flat channel (10) is at least 1.5 times greater than the maximum height H of the first, second and / or third flat channel (10). Fluid guiding device according to one of the preceding claims, characterized in that
the cross-sectional area of the first, second and / or third flat channel (10) and / or the longitudinal sectional area of the first, second and / or third oblong hole (4, 12) has the shape of an oval or a rectangle, in particular with rounded corners.

Images