DE102021124685A1 - COOKING APPLIANCE, IN PARTICULAR COMMERCIAL COOKING APPLIANCE - Google Patents

Abstract

Cooking appliance (1), in particular commercial cooking appliance, with a housing (2) in which an openable and closable cooking chamber (3) is arranged, with a fan (6) which has a fan wheel (7) which is connected to a fan motor (1st ) is provided, which comprises a drive shaft (12) which is drivingly connected to the impeller (7) and having an annular channel (15) which is in flow communication with an intake opening (11) of the housing (2), characterized in that a heating device (9) is arranged in the ring channel (15), and that a water injection nozzle (16) is arranged in the ring channel (15) adjacent to the heating device (9) of the ring channel (15).

Description

The invention relates to a cooking appliance, in particular in the form of a commercial cooking appliance, according to the preamble of claim 1.

Such a cooking appliance is from DE 103 51 476 B4 known. This cooking appliance has an extremely complex construction, the reason for this complex construction being that in convection cooking appliances, in which the cooking chamber atmosphere is rotated essentially via the main blades of the fan, there is a negative pressure for sucking in fresh air via a fresh air duct using auxiliary blades rotating with the main blades and facing the same. However, due to the lack of space in such a cooking appliance, it is not possible to place the windings of the fresh air duct in the cooking chamber, the interior of the cooking appliance near the impeller, where there are basically optimal pressure conditions, which according to the DE 103 51 476 B4 has the disadvantage that no maximum negative pressure is available as the driving force for sucking in the fresh air.

Another well-known hot convection device is from DE 41 3 748 C2 known. To generate steam, this hot air circulation device has a water supply pipe which is directed through an intake opening onto the fan impeller and whose outlet opening is directed radially offset to the axis of the fan impeller onto a surface arranged parallel to the intake opening, which forms a spray device, with this at a distance in front of the Level of the rear wall is arranged and has a surface area that is smaller than the suction opening and larger than the hub of the fan wheel. In this case, the spray device is a disk which is arranged at a distance from the rear wall in front of the hub and is provided with additional recesses and/or deformations on its circumference.

It is the object of the present invention to create a cooking appliance, in particular a commercial cooking appliance, according to the preamble of claim 1, which makes it possible to compensate for the disadvantages of the prior art with a technically simple structure.

This problem is solved by the features of claim 1.

In detail, the cooking appliance according to the invention is characterized in that a heating device is arranged in an annular channel and that a water injection nozzle is provided adjacent to this heating device.

The orientation of the water injection nozzle towards the heating device means that the water injection nozzle sprays the water to be injected directly onto the heating device, in particular when the water to be injected is swirled. First of all, this results in the advantage of a good distribution of the water droplets and the advantage of a very efficient generation of steam. In addition, the hot surfaces of the heater and the ring channel are on a side away from the customer, which makes it possible to easily remove any limescale that is caused by the evaporating water from these areas.

In addition to the heating device in the ring channel, a further heating device could be provided which surrounds the fan wheel of the cooking appliance according to the invention. There is the advantage that at low temperatures in the cooking chamber, pure steam can already be generated by the heating device in the annular channel, since the heating device in the annular channel has sufficient power to generate steam and advantageously does not heat the cooking chamber unnecessarily. In addition, there is the advantage that any lime only occurs in the area of this heating device in the ring channel.

As stated, it is also possible according to the invention for the cooking appliance according to the invention to have only one heater within the ring channel, which can be regarded as a pure steam generator.

• • Wasser- und Stromanschluss von der Motorseite her, beste Zugänglichkeit und Service-Freundlichkeit;
• • Anschluss des Reinigungssystems ebenso am Frischluftkanal für Entkalkung und Reinigung der Baugruppe möglich;
• • keine Zuleitung über die Decke mehr nötig;
• • Ansaugblech benötigt keine Einspritzleitung, keine Einbauteile im Garraum;
• • Zugänglichkeit der Heizung über Garraum nach der Demontage des Lüfterrades und eines Dampfkammerring;
• • deutliche Steigerung der Entfeuchtungsleistung;
• • integrierte Motorhalterung und Garraumversteifung;
• • niedrige Temperatur-Belastung des Frischluft-Regulierungsventils;
• • Funktion der Entfeuchte- und Dampferzeugung vereint in einer Baugruppe ;
• • gute Dampfleistung im Niedertemperaturbereich;
• • verbesserte Entfeuchtungsleistung;
• • wenige Bauteile, dadurch höhere Zuverlässigkeit; ein externer Dampferzeuger kann dadurch entfallen;
• • Bauteil mit Mehrfach-Funktion, Motorhalterung;
• • Versetzung des Motors in Richtung Garraum zur Bauraum-Reduzierung möglich;
• • Entkalkung über Garraum-Reinigung;
• • sofortige Betriebsbereitschaft für Dampferzeuger und Entfeuchtung;
• • gute Energiebilanz;
• • keine zusätzliche Temperaturüberwachung oder STB;
• • Dampferzeugung im Niedertemperaturbereich ohne Aktivierung der im Garraum befindlichen Heizung, falls eine solche vorgesehen ist, die den Garraum unnötig erwärmen würde.

There are also the following advantages:

• • Water and electricity connection from the engine side, best accessibility and service friendliness;
• • The cleaning system can also be connected to the fresh air duct for descaling and cleaning the assembly;
• • no more supply lines via the ceiling necessary;
• • Suction panel requires no injection line, no built-in parts in the cooking chamber;
• • Accessibility of the heater via the cooking chamber after dismantling the fan wheel and a steam chamber ring;
• • Significant increase in dehumidification performance;
• • integrated motor mount and cavity stiffener;
• • low temperature load on fresh air control valve;
• • Dehumidification and steam generation functions combined in one assembly;
• • good steam performance in the low temperature range;
• • improved dehumidification performance;
• • few components, thus higher reliability; an external steam generator can be omitted;
• • Multi-function component, engine mount;
• • Relocation of the motor in the direction of the cooking chamber to reduce installation space is possible;
• • Descaling via cooking chamber cleaning;
• • Immediate operational readiness for steam generator and dehumidification;
• • good energy balance;
• • no additional temperature monitoring or STB;
• • Generation of low-temperature steam without activating the heating in the cooking chamber, if one is provided, which would heat up the cooking chamber unnecessarily.

Furthermore, there are the advantages of a good distribution of water when it is introduced behind the fan wheel, which can also be used for a cleaning system. Here it is possible to introduce a cleaning agent into the ring channel through an additional nozzle, which can accordingly be well distributed in the cooking chamber. Furthermore, in the area where a decalcification agent is introduced, in particular in the area of the heating device, limescale that has formed can be efficiently removed, it also being possible to inject decalcifier via the water injection nozzle.

The dependent claims relate to advantageous developments of the invention.

The construction of the cooking device according to the invention can accordingly replace more complex systems, in particular boilers. This saves component costs and installation space and thus reduces the size of the device and also increases the reliability of the cooking device according to the invention. For the safe use of boilers, level monitoring must be provided.

In a particularly preferred embodiment, the area around the heating device in the ring channel can be separated as a chamber by a metal sheet or a steam chamber ring. The resulting annular gap produces a high flow rate and good media distribution as well as good intake of fresh air when a fresh air regulating valve arranged in the fresh air intake duct upstream of the water injection valve is opened.

It is also possible to provide a steam chamber ring in the ring channel for optimal steam distribution and dehumidification. Such a steam chamber ring can be arranged in such a way that it can be dismantled from the cooking chamber side. Furthermore, the steam chamber ring can be provided with one or more water outlet openings in its lower area.

In a further particularly preferred embodiment, it is possible to provide the ring channel with an engine mount and an engine stiffener.

It is preferably also possible to provide the fan wheel with an axially offset blade system in order to reduce the installation space for the fresh air intake.

• 1 eine leicht vereinfachte Teildarstellung einer ersten Ausführungsform eines erfindungsgemäßen Gargeräts;
• 2 eine der 1 entsprechende Teildarstellung einer zweiten Ausführungsform des erfindungsgemäßen Gargeräts;
• 3 eine der 2 entsprechende Prinzipdarstellung einer dritten Ausführungsform des erfindungsgemäßen Gargeräts;
• 4 eine den 2 und 3 entsprechende Prinzipdarstellung einer vierten Ausführungsform des erfindungsgemäßen Gargeräts; und
• 5 eine der 2 bis 4 entsprechende Prinzipdarstellung einer fünften Ausführungsform des erfindungsgemäßen Gargeräts.

Further details, advantages and features of the present invention result from the following description of exemplary embodiments with reference to the drawing. It shows:

• 1 a slightly simplified partial representation of a first embodiment of a cooking appliance according to the invention;
• 2 one of the 1 corresponding partial representation of a second embodiment of the cooking appliance according to the invention;
• 3 one of the 2 corresponding schematic diagram of a third embodiment of the cooking appliance according to the invention;
• 4 a den 2 and 3 corresponding schematic diagram of a fourth embodiment of the cooking appliance according to the invention; and
• 5 one of the 2 until 4 corresponding schematic diagram of a fifth embodiment of the cooking appliance according to the invention.

1 shows a representation of a cooking appliance 1 according to the invention, in particular in the form of a commercial cooking appliance.

The cooking appliance 1 has a housing 2 in which an openable and closable cooking chamber 3 is arranged.

Furthermore, a fan chamber 4 is arranged in the housing 2 , with a flow guide element 5 being arranged between the cooking chamber 3 and the fan chamber 4 .

Furthermore, the cooking appliance 1 has a fan 6 which comprises a fan wheel 7 which can be provided with main blades for generating a cooking chamber flow and preferably with auxiliary blades for sucking in fresh air, which opens into a fresh air intake opening 11 of the housing 2 .

1 FIG. 12 also makes it clear that the cooking appliance 1 has a fan motor 10 which includes a drive shaft 12 which is drivingly connected to the fan wheel 7 .

Furthermore, an annular channel 15 is provided, which is flow-connected to the fresh air intake opening 11 .

According to the invention, the cooking appliance 1 also has a heating device 9 which is arranged in the ring channel 15 .

A water injection nozzle 16 is also arranged in a transition region 24 of the fresh air intake duct 13 and is aligned with the heating device 9 , which is illustrated by the dashed lines emanating from the water injection nozzle 16 and impinging on the heating device 9 .

1 1 shows that the transition area 24 leads to the ring channel 15 which is arranged concentrically around the drive shaft 12 , which means that the drive shaft 12 forms the central axis of the ring channel 15 .

1 shows that the ring channel 12 is arranged behind the fan wheel 7, which means in other words that the ring channel 12 is arranged between the blower motor 10 and the fan wheel 7.

Further clarified 1 that a feed channel 26 is provided with a pump 27, which opens in a nozzle 17, which in turn opens in the annular channel 15. With this arrangement, cleaning agent can be introduced into the ring channel.

At the bottom according to the in 1 chosen representation, the ring channel 15 also has an outlet 25 .

In 2 a second embodiment of the cooking appliance 1 according to the invention is shown, which in this case is provided with an optional further heating device 8, which is arranged in the fan chamber 4 of the cooking chamber 3 and thereby surrounds the fan wheel 6 and is therefore 2 illustrated particularly preferred embodiment is annular.

Furthermore, the cooking appliance according to 2 a fresh air intake duct 13 which merges into the annular duct 15 via a transition area 24 in this embodiment. In this case, the water injection nozzle 16 is arranged in this transition region 24 and the nozzle 17 for cleaning agents is also provided in the fresh air intake duct.

Finally, a fresh air intake flap 18 is arranged in the fresh air intake duct 13 .

The arrow FL entering the fresh air intake duct 13 symbolizes the fresh air that has been sucked in, this arrow also showing the direction of flow R of the fresh air FL.

Seen in the direction of flow R of this sucked-in fresh air FL, the nozzle 17 for cleaning agents, such as descalers in particular, is provided above the water injection nozzle 16 .

The arrows P illustrate the flow path of the sucked in fresh air FL through the ring channel 15 and through the fresh air intake opening 11 in order to get into the cooking chamber 3 . Otherwise corresponds to the embodiment of the cooking appliance 1 according to FIG 2 with regard to the features provided with the same reference numbers of those of 1 .

3 shows an embodiment of the cooking appliance 1, the one according to 2 fully corresponds, so that in this respect reference can be made to the above description passages of the cooking appliance 1 .

3 serves to illustrate a housing drain 14 with which the cooking appliance 1 according to the invention is usually provided. At the in 3 illustrated embodiment connects to this housing outlet 14, a condenser 21, which is provided with an exhaust pipe 22.

4 shows a further embodiment of the cooking appliance 1 according to the invention, which in terms of the basic components based on the 1 and 2 have been described fully correspond to this embodiment, so that reference can be made to the relevant description passages.

4 serves to illustrate an embodiment of the fan wheel 7, which is provided with auxiliary blades 19, which are arranged on the rear side of the fan wheel.

At the in 4 illustrated particularly preferred embodiment, these auxiliary blades 19 blade sections 20 which extend into the annular channel 15. This embodiment of the fan wheel 7 serves to further improve the air intake by increasing a negative pressure in the area of the drive shaft 12.

5 shows a fifth embodiment of the cooking appliance 1 according to the invention, which in turn corresponds to the embodiment in terms of its basic structure 2 equals, so this regarding to the description of 2 can be referred to.

5 illustrates the possibility of moving the fan motor 10 in the direction of the fan wheel 7 or the cooking chamber 3, which results in the advantage of improved compactness of the cooking appliance 1 according to the invention. The space required for accommodating the fan motor 10 offset in the direction of the cooking chamber 3 is achieved by extending a peripheral wall 23 of the ring channel 15 .

As an alternative to the embodiments described above, it is possible that the cooking appliance, which in turn is designed in particular as a commercial cooking appliance, has no heating device 9 in the ring channel 15, but only the water injection nozzle 16 is provided in the ring channel 15 and that the evaporation of the water in the cooking chamber which is injected via the water injection nozzle 16 into the annular channel 15 via the heating device 8 in the cooking chamber 3 . This embodiment would also give advantages in terms of water consumption and limescale as previously described. Otherwise, the alternative embodiment described above has all the features of 2 , With the exception of the heating device 9, so that in this regard to the above description of 2 can be referred to.

In addition to the above written disclosure of the invention, the graphic representation of the invention in the 1 until 5 referenced.

reference list

1

Cooking device, in particular commercial cooking device

2

Housing

3

cooking chamber

4

blower room

5

flow guide element

6

fan

7

impeller

8th

heating device in the cooking chamber

9

Heating device in the ring channel

10

blower motor

11

fresh air intake opening

12

drive shaft

13

fresh air intake duct

14

housing drain

15

ring canal

16

water injector

17

Nozzle for detergent

18

fresh air intake flap

19

auxiliary blades

20

blade sections

21

capacitor

22

exhaust pipe

23

perimeter wall

24

transition area

25

outlet

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 10351476 B4 [0002]
• DE 413748 C2 [0003]

Claims (15)

Cooking appliance (1), in particular commercial cooking appliance, - with a housing (2) in which an openable and closable cooking space (3) is arranged - with a fan (6) having an impeller (7) with a is provided with a blower motor (10), which comprises a drive shaft (12) which is drivingly connected to the blower wheel (7), and - with an annular channel (15) which is in flow connection with an intake opening (11) of the housing (2), characterized in that - a heating device (9) is arranged in the ring channel (15), and - a water injection nozzle (16) is arranged in the ring channel (15) adjacent to the heating device (9) of the ring channel (15). cooking appliance claim 1 , characterized in that the water injection nozzle (16) is arranged at the rear of the fan wheel (7). cooking appliance claim 1 or 2 , characterized in that the second heating device (9) is designed as a ring heater, the center of which is the drive shaft (12) of the blower motor (10). Cooking device according to one of Claims 1 until 3 , characterized in that the ring channel (15) is arranged behind the fan wheel (7). Cooking device according to one of Claims 1 until 4 , characterized in that the annular channel (15) is arranged concentrically around the drive shaft (12). Cooking device according to one of Claims 1 until 5 , characterized in that a nozzle (17) for cleaning agents, in particular descalers, is provided. Cooking device according to one of Claims 1 until 6 , characterized in that the fan wheel (7) is provided with auxiliary blades (19) on the back of the fan wheel. cooking appliance claim 7 , characterized in that the auxiliary blades (19) are provided with blade sections (20) extending into the ring channel (15). Cooking device according to one of Claims 1 until 8th , characterized in that the fan wheel (7) is provided with an axially offset blade system. Cooking device according to one of Claims 1 until 9 , characterized in that the fan motor (10) is arranged offset axially in the direction of the cooking chamber (3). Cooking device according to one of Claims 1 until 10 , characterized in that the housing (2) is provided with a housing drain (14). Cooking device according to one of Claims 1 until 11 , characterized in that a further heating device (8) is provided in the cooking chamber (3). cooking appliance claim 11 or 12 , characterized in that a capacitor (21) connects to the housing outlet (14). cooking appliance Claim 13 , characterized in that the condenser (21) has an exhaust pipe (22). Cooking appliance (1), in particular commercial cooking appliance, with a housing (2) in which an openable and closable cooking chamber (3) is arranged; - With a fan (6) having a fan wheel (7) which is provided with a fan motor (10) comprising a drive shaft (12) which is drivingly connected to the fan wheel (7), and - with an annular channel ( 15) which is flow-connected to an intake opening (11) of the housing (2), characterized in that - a water injection nozzle (16) is arranged in the annular channel (15), and - a heating device (8) in the cooking chamber (3) is provided, which surrounds the impeller (7) annularly.

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