EP3479028A1

EP3479028A1 - Industrial cooking device

Info

Publication number: EP3479028A1
Application number: EP17734736.6A
Authority: EP
Inventors: Stan Smits
Original assignee: Convotherm Elektrogeraete GmbH
Current assignee: Welbilt Deutschland GmbH
Priority date: 2016-07-04
Filing date: 2017-07-03
Publication date: 2019-05-08
Also published as: WO2018007318A1; EP3686497A1; DE102016212162A1; EP3686497B1

Abstract

The invention relates to an industrial cooking device (1) having a housing (2), in which a cooking chamber (3) is arranged, and which has a cooking chamber rear wall (4), having an impeller (5), which is arranged in a region (6) of the housing (2) that is adjacent to the cooking chamber rear wall (6) and which has main blades (7) facing the cooking chamber (3) for producing a cooking chamber flow (GRS), having a fresh air inlet opening (9), characterized by an acceleration means (11) for the cooking chamber flow (GRS).

Description

Commercial cooking appliance

description

The invention relates to a commercial cooking appliance according to the preamble of claim 1. Such a cooking appliance has a housing in which a cooking chamber is arranged, which is made accessible via an openable and closable cooking chamber door. The cooking chamber or the housing have a cooking chamber rear wall, in the vicinity of which a fan wheel is arranged in the cooking chamber or in a fan wheel region of the cooking chamber. The fan of the generic cooking appliance has the cooking chamber facing main blades, which serve to produce a cooking chamber air flow, which may be a dry or a wet air flow and used for cooking in the cooking chamber arranged cooking products. The fan also has auxiliary blades which face the cooking chamber rear wall and cooperate with a fresh air inlet opening, which can supply fresh air to the cooking chamber via a fresh air inlet channel in order to dehumidify it, for example, or to influence the cooking chamber climate.

However, the fresh air inlet opening is in this case not arranged in an optimal vacuum conditions region of the cooking chamber rear wall, so that it is an object of the present invention to provide a cooking appliance specified in the preamble of claim 1 way that makes an improved fresh air supply into the oven possible. The solution of this object is achieved by the features of claim 1.

The concept according to the invention is based on the recognition that the provision of an accelerator device can accelerate the cooking chamber flow generated by the fan wheel, which in other words causes the arrangement of the accelerator device to lower the static pressure, which in turn means that the intake system of fresh air is improved by this lowered static pressure. By "acceleration" is understood according to the invention both a positive and a negative acceleration, ie a slowdown, the cooking space flow. In principle, the acceleration device can be arranged at any suitable point of the cooking chamber and / or the fan wheel, since any acceleration of the cooking chamber flow results in a reduction of the static pressure and thus an improvement in the intake of fresh air. For example, it is possible that the accelerating device is arranged in a region of the fresh air inlet opening in such a way that the explained negative pressure increase is made possible by the acceleration of the cooking chamber flow.

Thus, an improved supply of fresh air is achieved, although the fresh air inlet opening in the cooking appliance according to the invention, which in addition to the previously described, the preamble of claim 1 corresponding characteristics comprises the characterizing features of claim 1, not in the optimal intake, which is usually at least approximately in the middle the longitudinal axis of the fan wheel is located. However, the measures according to the invention eliminate these disadvantages, so that an influencing of the cooking space climate is optimized by the supply of fresh air in the manner explained above, which has a positive effect, for example, on a dehumidification of the cooking chamber.

From DE 103 51 476 A1, although a method and a cooking appliance for improved supply of fresh air is known, in which with respect to an orifice in the cooking chamber a Strömungsleitglied is provided in which, however, must be taken to ensure that the supplied fresh air does not accelerate in a first space is what it is necessary to maintain a minimum distance between the rear wall and the flow guide. This means that this Strömungsleitglied the fresh air flowing through the mouth neither slows down nor accelerated, but due to the distance to be maintained to the rear wall, the incoming fresh air only without any acceleration in a second space initiates, in which the sucked fresh air is set in rotation, thus a set desired flow.

The dependent claims have advantageous developments of the invention to the content.

The accelerating device can be mounted in principle on one of the fresh air inlet opening adjacent mounting point of the cooking chamber or the housing or directly on the fan. In a further alternative embodiment, it is possible to arrange the acceleration device partly in the cooking chamber and partly on the fan wheel, for example if the acceleration device comprises two acceleration components, one on the fan wheel and one on the one for increasing the negative pressure in Region of the fresh air inlet opening suitable location of the cooking chamber or the housing is arranged.

For example, it is possible for the acceleration device to either comprise an air guide plate which is arranged either in the cooking chamber or on the fan wheel, or that the acceleration device also has two or more such air guide plates which partly in the housing or in the cooking chamber and partly on the fan wheel are mounted and cooperate in the assembled state such that an acceleration of the cooking chamber air flow, in particular the flow region which runs over the main blades, is made possible.

If a plurality of air baffles, at least two such baffles provided, they can be arranged to each other such that there is a nozzle through which the cooking space flow is passed and through which this flow is accelerated due to the narrowing nozzle.

However, it is also possible to arrange two or more such baffles such that they are provided at an angle to the cooking chamber rear wall and limit the fresh air inlet opening, which means in other words that the fresh air inlet opening from its entry in the cooking chamber rear wall in the region of the angularly arranged air baffles is offset and thus the accelerated cooking space flow flows directly past the fresh air inlet opening, which significantly improves the negative pressure conditions and thus the intake of fresh air.

In addition to the provision of the above-explained air baffles, it is also possible to modify existing components already in the cooking appliance so that an acceleration device is formed, such as a nozzle, for example. Blechprägungen, profiles or certain cooking chamber geometries can be used, the e.g. to enable the creation of a nozzle. Among the components which may be present in the cooking chamber and which may be modified in this manner include, for example, gas heat exchangers, radiators, baffles and the like.

Furthermore, it is possible to provide the air baffles with grease discharge openings, so that the components according to the invention also offer the added benefit of enabling improved grease drainage.

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

Fig. 1 is a schematically simplified schematic diagram of a first

Embodiment of the cooking appliance according to the invention, in the purely schematic an acceleration direction in the form of a block representing this device is shown,

2A-2F also schematically greatly simplified partial representations of the cooking appliance according to the invention for explaining different embodiments of the acceleration device according to the invention,

3 shows a representation corresponding to FIG. 2A of a further embodiment,

Fig. 4-6 are plan views of the fan and the cooking chamber rear wall for explaining further alternative embodiments of the invention, and

Fig. 7 is a FIGS. 2A-3 corresponding representation of another embodiment of the cooking appliance according to the invention.

The cooking appliance 1 shown in FIG. 1 is preferably a commercial cooking appliance. This cooking appliance 1 has a housing 2, in the interior of which a cooking chamber 3 is arranged, which is accessible or can be closed with the aid of an openable and closable cooking chamber door 13.

In the cooking chamber 3 is adjacent to a cooking chamber 4, a fan 5 is arranged, which can be rotated, for example via a suitable electric motor in rotation and above its the cooking chamber 3 facing main blades 7 can produce a cooking chamber flow GRS, which serves in the cooking chamber 3 arranged cooking products, for example to cook by hot air or by steam.

The fan 5 has, in addition to the aforementioned main blades 7 auxiliary blades, of which in Fig. Representative two auxiliary blades 8A and 8B are shown, which point to the cooking chamber 4 and thus adjacent to a fresh air inlet 9 are arranged in the cooking chamber rear wall 4 , As illustrated in FIG. 1, the fresh air inlet opening 9 is arranged, in particular, in a wall region 10 of the cooking chamber rear wall 4, on which the auxiliary blades 8A and 8B pass when the fan wheel 5 rotates.

Fig. 1 further illustrates a symbolized by a point vacuum Pa, which serves to supply fresh air FL through a Frischluftzuführleitung 14 of the fresh air inlet opening 9, from where these fresh air FL with the aid of the auxiliary blades 8A and 8B can be introduced into the cooking chamber 3.

Fig. 1 further illustrates an accelerator 1 1, alternatively or additionally 1 1 ', which, as explained above, is shown in this drawing only as a block to illustrate their arrangement in a range between the cooking chamber 4 and .

5

a dashed line 16 and is indicated in Fig. 1 by the reference numeral 15. This area 15 represents the area in which an acceleration of the cooking space flow GRS by means of the accelerator 1 1 an increase in the vacuum PU is possible, the size of this area 15 of the cooking appliance, the drive power of the fan 5 and the design of the fan 5 and the arrangement of the fresh air inlet opening 9 depends and is accordingly adjustable.

In the following it will be explained with reference to FIGS. 2A to 2F, in which way the acceleration device 11 can be formed and at which positions this acceleration device 11 can be arranged. Thus, for example, the embodiment of FIG. 2A, only one air baffle 1 1A, which can be fixed in the example trap on a cooking chamber wall of the housing 2, so that the desired acceleration of the meeting on this air baffle 1 1A cooking space flow GRS results, to the previously explained negative pressure increase leads.

In the embodiment according to FIG. 2B, two air baffles 1 1A and 1 1 B are provided. The air baffle 1 1A is fixed in a suitable manner in the cooking chamber 3, while the air baffle 1 1 B is fixed to the impeller 5, so that the formation of a nozzle 1 1 C to accelerate the cooking space flow GRS results. Alternatively, it would also be possible that the air baffle 1 1 B is fixed in the cooking chamber at a suitable location, which would give the advantage that the fan 5 and its cover plate does not need to be modified. Fig. 2C shows a similar arrangement of two air baffles 1 1A, 1 1 B, which in turn form a nozzle 1 1 C for the cooking space flow GRS, although the air baffle 1 1A as well as the air baffle 1 1 B are fixed to the fan 5. Also in this case it is alternatively possible to arrange the air baffle 1 1 B in the cooking chamber at a suitable place. Both in the case of the embodiment according to FIG. 2B and also FIG. 2C, it is alternatively possible to create the acceleration device by means of a corresponding design of the rear wall of the fan wheel 5.

Fig. 2D shows an embodiment in which the fan 5 is provided with a cover plate 12, which includes a bent or curved outer edge region 12B, which forms an air guide plate for accelerating the cooking space flow GRS. As an additional feature, this cover plate 12 or its bevelled edge region 12B on Fettablass- or discharge openings 12A.

In the embodiment according to FIG. 12E, in turn, two air baffles 1 1A and 1 1 B are provided. Here, the air baffle 1 1A is disposed on a wall portion 10 'of the housing space rear wall 4, the cooking chamber 3 away in the direction of the _

6

Supply line 14 is arranged offset. The air guide plate 1 1 B is disposed on the wall portion 10. Both air baffles 1 1A and 1 1 B occupy their respective wall regions 10 and 10 'in each case an angle α, which means that the fresh air inlet opening 9 between the baffles 1 1A and 1 1 B is or is limited by these, so that the cooking space flow GRS can be passed directly past the fresh air inlet opening 9, which results in the desired acceleration and thus increase in vacuum.

In the embodiment according to FIG. 2F, in addition to the features of FIG. 2E, an auxiliary blade or a plurality of auxiliary blades 8A 'is provided, which have a flow edge 8A "which is arranged at least substantially parallel to the angled air guide sheets 1A1 and 1B as can be seen in detail from the illustration of Fig. 2F This results in a further improvement of the flow and pressure conditions, wherein otherwise reference may be made to the comments on Fig. 2E.

In Fig. 3, an embodiment of the fan wheel 5 is shown, which requires no auxiliary blade 8A and 8B, in which case an air guide 1 1A adjacent to the fresh air inlet opening 9 is arranged in the cooking chamber 3, such as by fixing to the cooking chamber rear wall 4 or a side wall Furthermore, the embodiment according to FIG. 3 illustrates that the fresh air inlet opening 9 is arranged above the upper edge of the fan wheel 5 in the wall region 10.

Fig. 4 illustrates a further embodiment by plan view of the cooking chamber rear wall 4, at the two mutually aligned air guide plates 12 A and 12 B are arranged, which can preferably protrude above the fan 5 in the cooking chamber 3. This arrangement in turn forms a nozzle 12C, which, as FIG. 4 illustrates, may be arranged in the region of the fresh air inlet opening 9 or else just below the fresh air inlet opening 9. Such an arrangement of air baffles 12A and 12B can also be combined with one of the above-described arrangements of the embodiment according to FIGS. 2A to 2F and 3.

FIG. 5 shows a representation corresponding to FIG. 4 of a further embodiment in which two air baffles 12A and 12B are again provided which, in this embodiment, can be arranged just above the fresh air inlet opening 9 and fastened, for example, to the cooking chamber rear wall 4. As a comparison of FIGS. 4 and 5 shows, due to the different arrangement of the fresh air inlet opening 9, the arrangement of the air baffles 12A and 12B in the embodiment according to FIG. 5 is V-like, whereas in the embodiment according to FIG. 4 it is an inverted V take a similar arrangement. In the embodiment of FIG. 6 are two curved, the Fan in its upper half encompassing baffles 12A and 12B are provided, which also form a nozzle 12C, within which the fresh air inlet opening 9 is arranged in the narrowest flow cross-section, where it opens above the fan 5 in the cooking chamber 4.

Fig. 7 shows an embodiment of the cooking appliance according to the invention, in which a nozzle 20 between a cooking chamber 17 and an air guide plate 18, 19 is formed, wherein the nozzle cross section between the cooking chamber 17 and a joint 21 of the angularly arranged air guide plates 18 and 19 is limited. The fresh air inlet opening 9 is arranged in the Garraumdeckenwand 17 in this embodiment, wherein the cooking space flow GRS is passed by the arrangement of the sheets 18 and 19 directly to the fresh air inlet opening 9. The angle between the sheets 18 and 19 can be set at the factory depending on the embodiment of the cooking appliance and dimensioning of the fan 5. As a baffle 18, a baffle can be used, which is arranged anyway in the cooking chamber 3 between the area in which the fan 5 is arranged, and the actual cooking area.

In addition to the above written disclosure of the invention, reference is made to complement the disclosure explicitly to the drawings of the invention in Figs. 1 to 7 reference.

_

LIST OF REFERENCE NUMBERS

1 cooking appliance

2 housings

3 cooking space

4 cooking compartment rear wall

5 fan wheel

6 adjacent area

7 main blades

8A, 8B, 8A 'auxiliary blades

8A "flow edge

9 Fresh air inlet opening

10 wall area

1 1, 1 1 'acceleration device

1 1A, 1 1 B Air baffles

1 1 C nozzle

12 fan shroud

12A fat discharge openings

12B air baffle

13 cooking chamber door

14 fresh air line

15 area

16 boundary line

17 cooking space wall

18 air baffle arrangement

19 air baffle arrangement

20 nozzle

21 connection point

FL fresh air

GRS cooking space flow

Pa negative pressure

Claims

Expectations

1 . Commercial cooking appliance (1 )

with a housing

(2)

• in which a cooking space

(3) is arranged, and

· the one back wall of the cooking space

(4) has,

with a fan wheel

(5)

• that in an area adjacent to the rear wall of the cooking space (4).

(6) of the housing (2) is arranged, and

• the main blades facing the cooking chamber (3).

(7) to generate a cooking space flow (GRS),

with a fresh air inlet opening (9),

marked

by an acceleration device (1 1) for the cooking chamber flow (GRS).

Cooking appliance according to claim 1, characterized in

Acceleration device (1 1) is fixed in the cooking chamber (3).

Device according to claim 1, characterized in that the acceleration device (1 1) is fixed on the fan wheel (5).

Apparatus according to claim 1, characterized in that the acceleration device (1 1) is partially fixed in the cooking chamber (3) and partially on the fan wheel (5).

Device according to one of claims 1 to 4, characterized in that the acceleration device (1 1) has at least one air baffle (1 1A, 1 1 B; 12A).

Device according to one of claims 1 to 5, characterized in that two air baffles (1 1 A, 1 1 B) are provided, which form a nozzle (1 1 C).

Device according to one of claims 1 to 5, characterized in that two air baffles (1 1A, 1 1 B) are provided, which are at an angle (a) to the rear wall of the cooking space (4) or to wall areas (10, 10 ') of the rear wall of the cooking space (4) are arranged and which limit the fresh air inlet opening (9).

8. Device according to one of claims 1 to 7, characterized in that the fan wheel (5) has auxiliary blades (8A, 8B, 8A ') facing the rear wall of the cooking space (4).

Device according to claim 8, characterized in that at least one auxiliary blade (8Α') has a flow edge (8A") which is arranged at least substantially parallel to the angled air baffles (1 1A, 1 1 B).

10. Device according to one of claims 5 to 9, characterized in that the air baffle (12B) is provided with grease drain openings (12A).

1 1 . Device according to claim 10, characterized in that the air baffle (12B) has a curved or angled edge region of a fan wheel cover plate

(12) forms.

Device according to one of claims 1 to 1 1, characterized in that the acceleration device (1 1) is arranged adjacent to the fresh air inlet opening (9).

13. Device according to one of claims 1 to 12, characterized in that the fresh air inlet opening (9) above the upper edge of the fan wheel (5) in one

Wall area (10) of the cooking chamber rear wall (4) is arranged.

14. Device according to one of claims 1 to 13, characterized in that two air baffles (12A, 12B) arranged at an angle to one another are arranged on the rear wall of the cooking space (4), which delimit a nozzle (12C) below the fresh air inlet opening (9).

15. Device according to one of claims 1 to 14, characterized in that the air baffles (12A, 12B) protrude in the direction of the cooking space (3) to above the fan wheel (5).